The ornamental design for operation buttons of display, as shown and described.
FIG. 1 is a front elevation view of operation buttons of display showing our new design, wherein the display is shown supported by a stand as environmental subject matter in a first position;
FIG. 2 is a rear elevation view of the display and stand shown in FIG. 1;
FIG. 3 is a left side elevation view thereof, wherein the right side elevation view is a mirror image of FIG. 3;
FIG. 4 is a top plan view of the operation buttons of the display and the stand shown in FIG. 1;
FIG. 5 is a bottom plan view of the display and stand shown in FIG. 1;
FIG. 6 is a front right isometric view of the operation buttons of the display and the stand shown in FIG. 1; and,
FIG. 7 is an additional front right isometric view thereof, wherein the display and stand are shown as environmental subject matter in a second position.
The broken lines in FIGS. 1 through 7 illustrate environmental subject matter and form no part of the claimed design.