A liquid crystal display includes a liquid crystal display panel, a backlight and a cover. The backlight includes optical sheets that are configured to be mounted to the cover using a plurality of holes provided on the optical sheet that material to corresponding protrusions provided on the cover. The holes and protrusions are configured to reduce damage or misalignment to the optical sheet that may be caused by heat generated inside the liquid crystal display.
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0. 19. A backlight unit comprising:
a housing including a first plurality of fixing parts and a second plurality of fixing parts protruding from the housing;
a plurality of light sources; and
at least one optical sheet disposed at a first side of the plurality of light sources, the at least one optical sheet including:
a first plurality of holes at a first edge of the optical sheet and configured to be coupled to the first plurality of fixing parts and comprising at least a first upper hole, second upper hole, and third upper hole,
wherein the third upper hole is located between the first upper hole and the second upper hole along the first edge, and
wherein the third upper hole has a smallest size among all of the first plurality of holes; and
a second plurality of holes at a second edge of the optical sheet opposite the first edge and configured to be coupled to the second plurality of fixing parts,
wherein the second plurality of holes comprises a first lower hole and a second lower hole being two holes that are positioned closest among the second plurality of holes to a vertical axis perpendicular to the second edge and aligned with a center of the third upper hole at the first edge;
wherein a distance from a first side edge of the optical sheet to the third upper hole is different than a distance from the first side edge to both of the first lower hole and the second lower hole.
0. 39. A backlight unit comprising:
a housing including a first plurality of fixing parts and a second plurality of fixing parts protruding from the housing;
a plurality of light sources; and
at least one optical sheet disposed at a first side of the plurality of light sources, the at least one optical sheet including:
a first plurality of holes at a first edge of the optical sheet and configured to be coupled to the first plurality of fixing parts and comprising at least a first upper hole, second upper hole, and third upper hole,
wherein the third upper hole is located between the first upper hole and the second upper hole along the first edge, and
wherein the third upper hole has a smallest size among all of the first plurality of holes; and
a second plurality of holes at a second edge of the optical sheet opposite the first edge and configured to be coupled to the second plurality of fixing parts,
wherein the second plurality of holes comprises a first lower hole and a second lower hole being two holes that are positioned closest among the second plurality of holes to a first vertical axis perpendicular to the second edge and aligned with a center of the third upper hole at the first edge,
wherein the first vertical axis is offset from a center of the first edge,
wherein a distance from the first upper hole to the third upper hole is different from a distance from the third upper hole to the second upper hole, and
wherein a distance along the second edge from the first lower hole to the first vertical axis is different than a distance along the second edge from the second lower hole to the first vertical axis.
0. 44. A backlight unit comprising:
a housing including a first plurality of fixing parts and a second plurality of fixing parts protruding from the housing;
a plurality of light sources; and
at least one optical sheet disposed at a first side of the plurality of light sources, the at least one optical sheet including:
a first plurality of holes at a first edge of the optical sheet and configured to be coupled to the first plurality of fixing parts and comprising at least a first upper hole, second upper hole, and third upper hole,
wherein the third upper hole is located between the first upper hole and the second upper hole along the first edge, and
wherein the third upper hole has a smallest size among all of the first plurality of holes; and
a second plurality of holes at a second edge of the optical sheet opposite the first edge and configured to be coupled to the second plurality of fixing parts,
wherein the second plurality of holes comprises a first lower hole and a second lower hole being two holes that are positioned closest among the second plurality of holes to a first vertical axis perpendicular to the second edge and aligned with a center of the third upper hole at the first edge,
wherein the first vertical axis is offset from a center of the first edge,
wherein a distance from the first upper hole to the third upper hole is different from a distance from the third upper hole to the second upper hole,
wherein the first lower hole is positioned closest to the first side edge along the second edge among the second plurality of holes and the second lower hole is positioned closest to a second side edge opposite the first side edge along the second edge among the second plurality of holes, and
wherein a distance along the second edge from the first lower hole to the first vertical axis is different than a distance along the second edge from the second lower hole to the first vertical axis.
0. 1. A display device comprising:
a display panel having a plurality of electrodes and pixels;
a backlight provided adjacent to the display panel, the backlight unit including at least one light guide panel having at least one light incident area to receive light from a first direction and a light emitting area to emit light received through the light incident area in a second direction, the first and second directions being different directions;
at least one light source, at least one incident area of the light guide panel being adjacent to at least one light source to receive light output;
a reflector adjacent to the light guide panel to reflect light towards the second direction; and
at least one optical sheet provided between the display panel and the backlight, the at least one optical sheet including a first optical sheet; and
a cover provided adjacent to the display panel or the backlight, wherein the cover includes a first rail near a first side of the cover and a second rail near a second side of the cover, the first and second sides being opposite sides, the first optical sheet has a first slot near a first side and a second slot near a second side, the first and second sides being opposite sides of the first optical sheet, and the first slot is fitted over the first rail and the second slot is fitted over the second rail,
wherein the cover further includes a third rail near a third side, which is between the first and second sides, and the first optical sheet further includes a third slot near third side, which is between the first and second sides of the first optical sheet, the third slot being fitted over the third rail,
wherein the first side and the second side of the optical sheet are longer than the third side of the optical sheet, and
wherein the first slot is smaller than the second slot and the third slot.
0. 2. The display device of
0. 3. The display device of
0. 4. The display device of
0. 5. The display device of
0. 6. The display device of
0. 7. The display device of
0. 8. The display device of
0. 9. The display device of
0. 10. The display device of
0. 11. A display device comprising:
a display panel having a plurality of electrodes and pixels;
a backlight provided adjacent to the display panel;
at least one optical sheet provided between the display panel and the backlight, the at least one optical sheet including a first optical sheet; and
a cover provided adjacent to the display panel or the backlight, wherein
the cover includes a first rail near a first side of the cover and a second rail near a second side of the cover, the first and second sides being opposite sides,
the first optical sheet has a first slot near a first side and a second slot near a second side,
the first and second sides being opposite sides of the first optical sheet, and
the first slot is fitted over the first rail and the second slot is fitted over the second rail,
wherein the cover further includes a third rail near a third side, which is between the first and second sides, and the first optical sheet further includes a third slot near third side, which is between the first and second sides of the first optical sheet, the third slot being fitted over the third rail, and
wherein a length of the first slot in a direction parallel to the first side is less than a length of the second slot in a direction parallel to the second side and a length of the third slot in a direction parallel to the third side.
0. 12. The display device of
0. 13. The display device of
0. 14. The display device of
0. 15. The display device of
0. 16. The display device of
0. 17. The display device of
0. 18. The display device of
0. 20. The backlight unit of claim 19, wherein a position of the third upper hole along the first edge is not symmetrical with a position of any of the second plurality of holes along the second edge with respect to a transverse axis of the optical sheet.
0. 21. The backlight unit of claim 19, wherein each of the second plurality of holes are positioned along the second edge such that a respective center of each hole of the second plurality of holes is not coincident with the vertical axis.
0. 22. The backlight unit of claim 19, wherein a distance between the first upper hole and the second upper hole along the first edge is greater than a distance between the first lower hole and the second lower hole along the second edge.
0. 23. The backlight unit of claim 19, wherein the distance from the first side edge to the third upper hole is less than the distance from the first side edge to the second lower hole.
0. 24. The backlight unit of claim 19, wherein the first plurality of holes further comprises a fourth upper hole between the third upper hole and the second upper hole,
the second upper hole is adjacent to a second side edge opposite the first side edge; and
wherein the second plurality of holes further comprises a third lower hole between the second lower hole and the second side edge.
0. 25. The backlight unit of claim 24, wherein the distance from the second upper hole to the fourth upper hole is different than a distance from the third lower hole to the second lower hole along the second edge.
0. 26. The backlight unit of claim 25, wherein the distance from the second upper hole to the fourth upper hole is greater than the distance between the third lower hole to the second lower hole.
0. 27. The backlight unit of claim 25, wherein a distance from the second side edge to the second upper hole is less than a distance from the second side edge to the third lower hole.
0. 28. The backlight unit of claim 27, wherein a distance from the third upper hole to the fourth upper hole is less than a distance from the first lower hole to the second lower hole.
0. 29. The backlight unit of claim 19, wherein at least one of the first plurality of holes or the second plurality of holes is positioned between a plurality of data driving circuits.
0. 30. The backlight unit of claim 19, wherein the plurality of first holes and the plurality of second holes are positioned at corresponding protruding portions respectively protruding from the first edge and the second edge of the optical sheet.
0. 31. The backlight unit of claim 19, wherein respective positions of the first plurality of holes and the second plurality of holes are asymmetrical with respect to a transverse axis of the optical sheet.
0. 32. The backlight unit of claim 19, wherein a number of the first plurality of holes is different than a number of the second plurality of holes.
0. 33. The backlight unit of claim 32, wherein the number of the first plurality of holes is greater than a number of the second plurality of holes.
0. 34. The backlight unit of claim 19, wherein the plurality of first holes are positioned toward an inner side of the first edge of the optical sheet and the plurality of second holes are positioned toward an inner side of the second edge of the optical sheet.
0. 35. The backlight unit of claim 19, wherein a first opening distance of each of the first plurality of holes is greater than a second opening distance of the first plurality of holes, wherein the first opening distance is a distance of each hole in a direction parallel to the first edge and the second opening distance is a distance of each hole in a direction perpendicular to the first opening distance.
0. 36. The backlight unit of claim 35, wherein a corresponding first opening distance of at least one of the first plurality of holes is different from a corresponding first opening distance of at least another one of the first plurality of holes.
0. 37. The backlight unit of claim 35, wherein a corresponding first opening distance of the third upper hole is less than corresponding first opening distances of the first upper hole or the second upper hole.
0. 38. The backlight unit of claim 35, wherein a corresponding second opening distance of the third upper hole is substantially equal to corresponding second opening distances of the first upper hole or the second upper hole.
0. 40. The backlight unit of claim 39, wherein a number of the first plurality of holes is greater than a number of the second plurality of holes.
0. 41. The backlight unit of claim 40, wherein none of the positions of the first plurality of holes along the first edge are symmetrical with any of the positions of the second plurality of holes along the second edge with respect to a transverse axis of the optical sheet.
0. 42. The backlight unit of claim 39, wherein a distance from the first side edge to the first upper hole along the first edge is the same as a distance from a second side edge opposite the first side edge to the second upper hole along the first edge.
0. 43. The backlight unit of claim 39, wherein a distance from the first side edge to the first lower hole along the second edge is the same as a distance from a second side edge opposite the first side edge to the second lower hole along the second edge.
0. 45. The backlight unit of claim 44, wherein a number of the first plurality of holes is greater than a number of the second plurality of holes.
0. 46. The backlight unit of claim 45, wherein none of the positions of the first plurality of holes along the first edge are symmetrical with any of the positions of the second plurality of holes along the second edge with respect to a transverse axis of the optical sheet.
0. 47. The backlight unit of claim 44, wherein a distance from the first side edge to the first upper hole along the first edge is the same as a distance from the second side edge to the second upper hole along the first edge.
0. 48. The backlight unit of claim 44, wherein a distance from the first side edge to the first lower hole along the second edge is the same as a distance from the second side edge to the second lower hole along the second edge.
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The holes 251 may be formed at protrusions or tabs 252 protruded from at least one side of the optical sheet 250, for example, at the upper side 255 and the lower side 256 of the optical sheet 250. The protrusions 252 may subsequently be coupled with the cover 130 or the housing 135, and may be formed such that they protrude from one side of the optical sheet 250.
The holes 251 formed at the protrusions 252 may have various shapes including a polygonal shape, a triangular shape, a circular shape, a quadrangular shape, or other appropriate shapes. Also, the protrusions 252 may have various shapes that allow the protrusions 252 to be easily coupled with the cover 130 or the housing 135. For example, the portions of the protrusions 252 in contact with the cover 130 or the housing 135 may have a large quadrangular shape.
The plurality of holes 251 may be formed such that a number of holes 251 formed on one of the plurality of sides of the optical sheet 250 is less than a number of holes 251 formed on another of the plurality of sides of the optical sheet 250. For example, as shown in
A plurality of holes 251 may also be formed on the sides of the optical sheet 250 which face each other. For example, as shown in
Referring to
Referring to
Referring to
Referring now to
Further, with reference to
As shown in
Referring now to
As described above, the optical sheet 250 according to the first embodiment may include the plurality of holes 251 on at least one side or at the corners thereof to fixedly couple the optical sheet 250 to the cover 130 or the housing 135. Thus, the reliability of the coupled optical sheet 250 and cover 130 or the housing 135 may be improved. Further, the optical characteristics of light emitted from the light sources may be effectively enhanced. The disposition of the holes of the optical sheet as illustrated in
The fixing parts 310 may be formed on a step portion 315 of the side walls 323 and 324 of the cover 300 such that it may protrude upward from the side walls 323 and 324. The protrusion may have a hexahedral shape, cylindrical shape, spherical shape, or other appropriate shape and is not particularly limited thereto. Further, as described above the fixing part may also be formed as a rail. Hence, the fixing part 310 may also be referred to herein as a rail 310. The step portion 315 may be a size sufficient to allow a hole 251 formed at a protrusion 252 of the optical sheet 250 to be mounted thereon. Further, the fixing part 310 may be positioned at a central portion of the step portion 315. The size of the fixing part 310 formed at the step portion 315 may be the same as that of the hole 251 formed on the protrusion 252, or may be slightly larger than that of the hole 251. Accordingly, the hole 251 of the optical sheet 250 may be coupled with the fixing part 310 of the cover 300 to fix the optical sheet 250 to the cover 300.
Referring to
The fixing parts 310 may be disposed on the step portions 315. The step portions 315 illustrated in
As shown in
Also, the hole 251 of the optical sheet 250 or the fixing part 310 of the cover 300 may have a circular shape as shown in
Hereinafter, the configuration in which the hole 251 of the optical sheet 250 and the fixing part 310 of the cover 300 are coupled will now be described in detail. Simply for ease of explanation, the hole 251 of the optical sheet 250 and the fixing part 310 of the cover 300 will be described with reference to a hole having a rectangular shape.
As shown in
Here, the optical sheet 250 may be disposed on the cover 300 such that the holes 251 of the optical sheet 250 may be coupled with the fixing parts 310 of the cover 300. For example, referring to enlarged portion ‘A’ in
Referring to a portion ‘B’ in
For example, in order to secure an area at the side of the cover 300 where the data driving circuits 430 may be mounted, the fixing parts 310 may be disposed between the data driving circuits 430, and the protrusions 252 and the holes 251 of the optical sheet 250 may be disposed between the data driving circuits 430 according to the disposition of the fixing parts 310.
Referring to
For example, in the enlarged portion ‘C’ where the hole 251 may be coupled to the fixing part 310 at the edge on the upper side of the optical sheet 250, a first distance d1 may be formed between the first side 251a of the hole 251 and the fifth side 310a of the fixing part 310, a second distance d2 may be formed between the second side 251b of the hole 251 and the sixth side 310b of the fixing part 310, a third distance d3 may be formed between the third side 251c of the hole 251 and the seventh side 310c of the fixing part 310, and a fourth distance d4 may be formed between the fourth side 251d of the hole 251 and the eighth side 310d of the fixing part 310.
The first distance d1 may range from 0.05 mm to 0.3 mm, and may preferably be 0.1 mm. Here, when the first distance d1 is longer than 0.05 mm, a sufficient margin may be provided to allow for an expansion of the optical sheet 250 due to heat generated in the LCD. Thus, a crease in the optical sheet 250 due to thermal expansion may advantageously be prevented. When the first distance d1 is shorter than 0.3 mm, tension may be caused on the optical sheet 250 by the fixing part 310 when the optical sheet 250 contracts as heat dissipates from the optical sheet 250. Thus, a crease in the optical sheet 250 due to thermal contraction may advantageously be prevented.
The second distance d2 may range from 0.1 mm to 1 mm, and may preferably be 0.5 mm. Here, when the second distance d2 is longer than 0.1 mm, a sufficient margin may be provided to allow for an expansion of the optical sheet 250 due to heat generated in the LCD. Thus, a crease in the optical sheet 250 due to thermal expansion may advantageously be prevented. When the second distance d2 is shorter than 1 mm, the second distance d2 between the fixing part 310 and the hole 251 may increase as the optical sheet 250 contracts as heat dissipates from the optical sheet 250, thus advantageously preventing the hole 251 from being released from the fixing part 310. For example, a length of the slot or hole 251 may be 0.15 mm to 1.3 mm larger than a length of the rail or fixing part 310.
The third distance d3 and the fourth distance d4 may range from 1 mm to 5 mm, and may preferably be 2 mm. Here, when the third distance d3 and the fourth distance d4 are longer than 1 mm, a sufficient margin may be provided to allow for an expansion of the optical sheet 250 due to heat generated in the LCD, thus a crease in the optical sheet 250 may advantageously be prevented. When the third distance d3 and the fourth distance d4 are shorter than 5 mm, the third distance d3 and the fourth distance d4 between the fixing part 310 and the hole 251 may increase, thus advantageously preventing the hole 251 and the fixing part 310 from being released. For example, a width of the slot or hole 251 may be 2 mm to 10 mm larger than a width of the rail or fixing part 310.
Referring to
The fifth distance d5 may range from 0.05 mm to 0.3 mm, and may preferably be 0.1 mm. Here, when the fifth distance d5 is longer than 0.05 mm, a sufficient margin may be provided to allow for an expansion of the optical sheet 250 due to heat generated in the LCD. Thus, ceasing of the optical sheet 250 may be prevented. When the fifth distance d5 is shorter than 0.3 mm, tension may be created on the optical sheet 250 by the fixing part 310 as the optical sheet 250 contracts due to dissipation of heat, thus advantageously preventing the optical sheet 250 from being creased.
The sixth distance d6 may range from 0.1 mm to 1 mm, and may preferably be 0.5 mm. Here, when the sixth distance d6 is longer than 0.1 mm, a margin sufficient for thermal expansion of the optical sheet 250 may be provided, thus advantageously preventing the optical sheet 250 from being creased. When the sixth distance d6 is shorter than 1 mm, the sixth distance d6 between the fixing part 310 and the hole 251 may increase as the optical sheet 250 contracts as heat is dissipated, thus advantageously preventing the hole 251 from being released from the fixing part 310. For example, the length of hole 251 may be 0.15 mm to 1.3 mm larger than a length of the rail or fixing part 310.
The seventh distance d7 and the eighth distance d8 may range from 0.1 mm to 1 mm, and may preferably be 0.5 mm. Here, when the seventh distance d7 and the eighth distance d8 are longer than 0.1 mm, a sufficient margin may be provided to allow for an expansion of the optical sheet 250 due to heat generated in the LCD, thus a crease in the optical sheet 250 may advantageously be prevented. When the seventh distance d7 and the eighth distance d8 are shorter than 1 mm, the hole 251 and the fixing part 310 may serve to fix the optical sheet 250 at the central portion of the optical sheet 250, thus advantageously preventing the optical sheet 250 from being distorted at its position. For example, a width of the slot or hole 251 may be 0.15 mm to 1.3 mm larger than a width of the rail or fixing part 310.
As discussed above with reference to
As for the relationship between the hole 251 and the fixing part 310 disposed at the central portion ‘D’ of the optical sheet 250, they may be positioned near a central portion of the optical sheet 250 and may serve to fix the overall position of the optical sheet 250 as stated above. Accordingly, the optical sheet 250 may be fixed to prevent its position from changing due to an expansion or contraction of the optical sheet 250.
Also, as for the relationship between the hole 251 and the fixing part 310 disposed at enlarged portion ‘C’ of the optical sheet 250, they may be positioned at the edge of the optical sheet 250 to secure a margin sufficient to allow for the extraction and contraction of the optical sheet 250. Thus, the third distance d3 and the fourth distance d4 may be larger than the corresponding distances at the central position ‘D’.
Referring to
The ninth distance d9 may range from 0.1 mm to 1 mm, and may preferably be 0.5 mm. Here, when the ninth distance d9 is longer than 0.1 mm, a margin sufficient to allow for thermal expansion of the optical sheet 250 may be provided, thus advantageously preventing the optical sheet 250 from being creased. When the ninth distance d9 is shorter than 1 mm, tension may be provided to the optical sheet 250 by the fixing part 310 when the optical sheet 250 contracts as heat dissipates from the optical sheet 250, thus advantageously preventing the optical sheet 250 from being creased.
The tenth distance d10 may range from 0.1 mm to 1 mm, and may preferably be 0.5 mm. Here, when the tenth distance d10 is longer than 0.1 mm, a margin sufficient to allow for thermal expansion of the optical sheet 250 may be provided, thus advantageously preventing the optical sheet 250 from being creased. When the tenth distance d10 is shorter than 1 mm, the tenth distance d10 between the fixing part 310 and the hole 251 may increase as the optical sheet 250 contracts as heat dissipates from the optical sheet 250, thus advantageously preventing the hole 251 from being released from the fixing part 310. For example, a length of slot or hole 251 may be 0.2 mm to 2 mm larger than a length of rail or fixing part 310.
The eleventh distance d11 and the twelfth distance d12 may range from 1 mm to 5 mm, and may preferably be 2 mm. Here, when the eleventh distance d11 and the twelfth distance d12 are longer than 1 mm, a margin sufficient to allow for thermal expansion of the optical sheet 250 may be provided, thus advantageously preventing the optical sheet 250 from being creased. When the eleventh distance d11 and the twelfth distance d12 are shorter than 5 mm, the eleventh distance d11 and the twelfth distance d12 between the fixing part 310 and the hole 251 may be lengthened, thus advantageously preventing the hole 251 and the fixing part 310 from being released. For example, a width of slot or hole 251 may be 2 mm to 5 mm larger than a width of rail or fixing part 310.
Moreover, the range of distances for d1 and d5 as described above are applicable when the LCD 100 is positioned horizontally. However, when the LCD is positioned vertically, for example, when mounted on a stand or on a wall for use, as enlarged portions ‘C’ and ‘D’ are positioned at the upper side 255 of the optical sheet 250, distances d1 and d5 will become zero. Further, in the vertical position, distances d2, d6, d10, and d9 will adjust accordingly.
Meanwhile, with reference to
The holes 215 provided on the optical sheet 250 according to this embodiment may be positioned on the upper side 255 and the lower side 256 of the optical sheet 250, and the size of the holes 251 positioned on the upper side 255 of the optical sheet 250 may be different from that of the holes 251 positioned on the lower side 256 of the optical sheet 250. For example, the size of the holes 251 positioned on the upper side 255 of the optical sheet 250 may be smaller than the size of the holes 251 positioned on the lower side 256 of the optical sheet 250.
For example, the size of the hole 251 positioned on the upper side 255 of the optical sheet 250 may be smaller than the size of the hole 251 positioned on the lower side 256 of the optical sheet 250. Thus, as aforementioned, the hole 251 positioned on the upper side 255 of the optical sheet 250 may act as a reference point for fixing the optical sheet 250 to the cover 300 to prevent the optical sheet 250 from being deformed, for example, by heat, which may cause it to shift or move from its original position. Further, the hole 251 positioned on the lower side 256 of the optical sheet 250 may serve to provide a margin for thermal expansion when the optical sheet 250 is deformed by heat.
With reference to
For example, the size of the hole 251 positioned at the central portion of the upper side 255 of the optical sheet 250 may be smaller than that of the hole 251 positioned at the edge of the upper side 255 of the optical sheet 250. Thus, as previously discussed, the hole 251 positioned at the central portion of the upper side 255 of the optical sheet 250 may act as a reference point for fixing the optical sheet 250 to the cover 300 to prevent the optical sheet 250 from being deformed, shifted, or moved due to thermal expansion, while the hole 251 positioned at the edge of the upper side 255 of the optical sheet 250 may serve to provide a margin for thermal expansion when the optical sheet 250 is deformed by heat.
In the foregoing description, simply for ease of explanation, the fixing parts 310 have been described as being provided on the cover 300 and shaped as a rail. However, the present invention is not limited thereto. For example, the fixing parts 310 may be provided on the bottom plate of the housing and may be formed in any appropriate shape as previously described.
The optical assembly 210 may disposed on the optical sheet 250, and the cover 300 and a bottom plate 320 may be coupled by means of a screw 330. Here, as shown in
As described above, in the LCD 100, the liquid crystal display panel 400, the optical sheet 250, and the optical assembly 210 may be received in the cover 300 and the bottom plate 320, and the hole 251 of the optical sheet 250 may be fixedly coupled to the fixing part 310 of the cover 300. Thus, the optical sheet 250 may be prevented from being deformed as it thermally contacts or expands due to heat generated from the light sources of the optical assembly 210. Therefore, light uniformity of the backlight unit may be improved.
The optical assembly 540 received in the bottom plate 510 may include a first layer 541, light sources 542, light guide plates 543, and a reflective plate 544. The first layer 541 may be a board (or substrate) on which a plurality of light sources 542 may be mounted. An electrode pattern may be formed on the first layer 541 to connect an adapter that may supply power and the light sources 542. The first layer 541 may be a PCB formed of polyethylene terephthalate (PET), glass, polycarbonate (PC), silicon (Si), or other appropriate materials, on which the plurality of light sources 542 may be mounted. The first layer 541 may be formed as a film.
The light sources 542 may be one of a light emitting diode (LED) chip and an LED package including at least one LED chip. In this embodiment, simply for ease of explanation, the light sources 542 will be described as being an LED package. The LED package constituting the light sources 542 may be classified into a top view type LED package and a side view type LED package depending on the direction of a light emission surface. The light sources 542 may be configured by using at least one of the top view type LED package in which a light emission surface may be formed toward the upper side and the side view type LED package in which the light emission surface may be formed toward the side.
The light guide plates 543 may be disposed in a direction in which light may be emitted from the light sources 542 and may serve to widely spread light formed incident from the light sources 542. In this embodiment, the light guide plate 543 may be configured such that a side contiguous with the light source 542 may include a step that may allow a neighboring light guide plate 543 to be mounted thereon. A lower surface of the light guide plate 543 may be formed to slope, or positioned at an angle, to upwardly reflect light received from the light source 542. The reflective plate 544 may be disposed on the lower surface of the light guide plate 543 and may serve to upwardly reflect light which may be reflected downward from the light guide plate 543.
The optical assembly 540 including the first layer 541, the light sources 542, the light guide plates 543, and the reflective plate 544 may implement light in an edge manner. A plurality of light source assemblies 540 may be provided in the LCD 500. With reference to
As shown in
The optical sheet 560 may be mounted on the plurality of light source assemblies 540 and may be coupled to the fixing part 520 formed on the side wall of the bottom plate 510. Here, as shown in
Accordingly, as the holes 565 of the optical sheet 560 may be coupled to the fixing parts 520 formed on the side wall of the bottom plate 510, the optical sheet 560 may be fixed to the bottom plate 510. Thus, the optical sheet 560 may be prevented from being deformed as it contracts or expands due to heat generated from the light sources 542 of the optical assembly 540. Therefore, light uniformity of the backlight unit may be improved.
The direct type backlight unit 600 as illustrated in
Meanwhile, the backlight units according to the first and second embodiments may be configured to have the light source assemblies including very small LED light sources. For example, in the backlight unit according to the first embodiment as shown in
For example, the backlight units according to the first and second embodiments may have a relatively thin structure as they may use very small LED light sources. Thus, the space between the LED light sources and the optical sheet may be very narrow. Heat discharged from the light sources, therefore, may be directly transferred to the optical sheet. In particular, in case of the backlight unit according to the first embodiment, there may not be sufficient space for releasing heat that is generated by the LED light sources. This may result in deformation of the optical sheet formed of a resin material as it contracts or expands due to the heat generated by the light sources.
Thus, in order to overcome this problem, in the first and second embodiments, the plurality of holes may be formed on the optical sheet and coupled to the plurality of fixing parts that may be formed on the bottom plate. Accordingly, a margin, allowing for thermal expansion of the optical sheet due to heat generated by the light sources, may be created between the holes and the fixing parts, thereby preventing possible creases in the optical sheet. Also, as the optical sheet contracts, the fixing parts may serve to apply tension to the optical sheet to prevent the optical sheet from contracting. Thus, deformation of the optical sheet may be prevented.
The optical assembly 740 received in the bottom plate 710 may include a first layer 741 and the light sources 742. The first layer 741 may be a board (or substrate) on which a plurality of light sources 742 may be mounted. An electrode pattern may be formed on the first layer 741 in order to connect an adapter that may supply power and the light sources 542. The first layer 741 may be a PCB formed of polyethylene terephthalate (PET), glass, polycarbonate (PC), silicon (Si), or other appropriate materials on which the plurality of light sources 742 may be mounted. The first layer 741 may be formed as a film.
The light sources 742 may be one of a light emitting diode (LED) chip and an LED package including at least one LED chip. In this embodiment, simply for ease of explanation, the light sources 742 will be described as being an LED package. The LED package constituting the light sources 742 may be classified into a top view type LED package and a side view type LED package depending on the direction of a light emission surface. The light sources 742 according to this embodiment may be configured by using at least one of the top view type LED package in which a light emission surface may be formed toward the upper side and the side view type LED package in which the light emission surface may be formed toward the lateral side.
A light guide plate 743 may be disposed in a direction in which light may be emitted from the light sources 742 and may serve to widely spread light formed incident from the light sources 742. A reflective plate 744 may be disposed at a lower portion of the light guide plate 743 to reflect upwards light which may be reflected downward from the light guide plate 743. The optical assembly 740 including the first layer 741 and the light sources 742 may be positioned on the side of the bottom plate 710 as a backlight unit implementing light in an edge manner.
The optical sheet 760 may be positioned on the light guide plate 743. The optical sheet 760 may be a diffusion sheet that may diffuse light or a prism sheet that may concentrate light. A plurality of optical sheets may be formed. The optical sheet 760 may be mounted on the light guide plate 760 and may be coupled to the fixing part 720 formed on the side wall of the bottom plate 710. Here, as shown in
The light guide plate 840 may be positioned on the side portion of the light sources 830 and on the entire surface of the bottom plate 810. The light guide plate 840 may also serve to reflect light emitted from the light sources 830 to change it into a surface-type light. The optical sheet 850 may be positioned at an upper side of the light guide plate 840.
The edge type backlight unit 800 illustrated in
Meanwhile, the backlight unit according to the third embodiment may be configured to have the light source assemblies including very small LED light sources. For example, the backlight unit according to the third exemplary embodiment of the invention may have a relatively thin structure in which the very small LED light sources may be used. Thus, the space between the LED light sources and the optical sheet may be very narrow. Accordingly, heat discharged from the light sources may be directly transferred to the optical sheet.
Also, in order to emit light with an equal luminance as that of the fluorescent lamp light sources, a large amount of current may be required by the LED light sources. In this case, as the applied current increases the amount of heat generated by the LED may also increase. Then, the optical sheets that are formed of a resin material may be deformed and may contract or expand due to heat emitted from the light sources.
Thus, in the edge type backlight unit according to the third embodiment, a plurality of holes may be formed at the optical sheet and a plurality of fixing parts may be formed at the bottom plate, wherein the holes of the optical sheet and the fixing parts of the bottom plate may be coupled to each other. Accordingly, a margin allowing for thermal expansion of the optical sheet due to heat generated by the light sources may be created between the holes and the fixing parts, thereby preventing possible creases in the optical sheet. Also, as the optical sheet contracts, the fixing parts may serve to apply tension to the optical sheet to prevent the optical sheet from contracting. Thus, deformation of the optical sheet may be prevented.
A display device is broadly described and embodied herein and may include a display panel having a plurality of electrodes and pixels; a backlight provided adjacent to the display panel, the backlight unit including at least one light guide panel having at least one light incident area to receive light from a first direction and a light emitting area to emit light received through the light incident area in a second direction, the first and second directions being different directions; at least one light source, at least one incident area of the light guide panel being adjacent to at least one light source to receive light output; and a reflector adjacent to the light guide panel to reflect light towards the second direction; and at least one optical sheet provided between the display panel and the backlight, the at least one optical sheet including a first optical sheet; and a cover provided adjacent to the display panel or the backlight, wherein the cover includes a first rail near a first side of the cover and a second rail near a second side of the cover, the first and second sides being opposite sides, the first optical sheet has a first slot near a first side and a second slot near a second side, the first and second sides being opposite sides of the first optical sheet, and the first slot is fitted over the first rail and the second slot is fitted over the second rail.
The display device is disclosed wherein the first slot is smaller than the second slot; wherein the first and second rails have the same size; wherein when the display device is positioned to be vertical such that the second direction is perpendicular to a direction of gravity, the first slot of the first optical sheet hangs onto the first rail, and the second slot is provided loosely over the second slot.
The display device is disclosed wherein the first optical sheet includes a plurality of tab portions, a first tab portion extending from the first side of the optical sheet and the first slot being provided on the first tab portion, and a second tab portion extending from the second side of the optical sheet and the second slot being provided on the second tab portion; wherein the backlight is provided within a first area of the cover, and at least a portion of the first tab portion and the second tab portion are provided outside of the first area; and wherein the at least one light guide panel is provided within a first are of the cover, and the at least a portion of the first tab portion and the second tab portion are provided outside of the first area; wherein the at least one light guide panel is provided within a first area of the cover, and the at least a portion of the first tab portion and the second tab portion are provided outside of the first area.
Here, as shown in
The display device is disclosed wherein the third rail 310 has a first width l8 and a first length l7 and the third slot 251 has a first width l10 and a first length l9, the first width l10 of the third slot being larger than the first width l8 of the third rail by 2 mm to 10 mm, and the first length l9 of the third slot being larger than the first length l7 of the third rail by 0.15 mm to 1.3 mm; wherein the first rail has a first width and a first length and the first slot has a first width and a first length, the first width of the first slot being larger than the first width of the first rail by 0.2 mm to 2 mm, and the first length of the first slot being larger than the first length of the first rail by 0.15 mm to 1.3 mm; and wherein the second rail has a first width and a first length and the second slot has a first width and a first length, the first width of the second slot being larger than the first width of the second rail by 2 mm to 10 mm, and the first length of the second slot being larger than the first length of the second rail by 0.2 mm to 2 mm.
A display device comprises a display panel having a plurality of electrodes and pixels; a backlight provided adjacent to the display panel; at least one optical sheet provided between the display panel and the backlight, the at least one optical sheet including a first optical sheet; and a cover provided adjacent to the display panel or the backlight, wherein the cover includes a first rail near a first side of the cover and a second rail near a second side of the cover, the first and second sides being opposite sides, the first optical sheet has a first slot near a first side and a second slot near a second side, the first and second sides being opposite sides of the first optical sheet, the first slot is fitted over the first rail and the second slot is fitted over the second rail, and the first slot is smaller than the second slot.
The display device is disclosed wherein the first and second rails have the same size; wherein the first optical sheet includes a plurality of tab portions, a first tab portion extending from the first side of the optical sheet and the first slot being provided on the first tab portion, and a second tab portion extending from the second side of the optical sheet and the second slot being provided on the second tab portion; wherein the backlight is provided within a first area of the cover, and at least a portion of the first tab portion and the second tab portion are provided outside of the first area; and wherein the at least one light guide panel is provided within a first area of the cover, and the at least a portion of the first tab portion and the second tab portion are provided outside of the first area.
The display device is disclosed wherein the first rail has a first width and a first length and the first slot has a first width and a first length, the first width of the first slot being larger than the first width of the first rail by 0.2 mm to 2 mm, and the first length of the first slot being larger than the first length of the first rail by 0.15 mm to 1.3 mm; and wherein the second rail has a first width and a first length and the second slot has a first width and a first length, the first width of the second slot being larger than the first width of the second rail by 2 mm to 10 mm, and the first length of the second slot being larger than the first length of the second rail by 0.2 mm to 2 mm.
Any reference in this specification to “one embodiment,” “an embodiment,” “example embodiment,” etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the purview of one skilled in the art to effect such feature, structure, or characteristic in connection with other ones of the embodiments.
Although embodiments have been described with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More particularly, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure, the drawings and the appended claims. In addition to variations and modifications in the component parts and/or arrangements, alternative uses will also be apparent to those skilled in the art.
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