Patent ID: 8641261

Claim:
A backlight module, comprising: a light guide plate having a light emitting surface and a light incident end, wherein the light incident end is located at an adjacent side of the light emitting surface; a backlight source disposed corresponding to the light incident end; an optical plate disposed above the light emitting surface, the optical plate including an extension portion disposed above the backlight source; an optical coating layer formed on a surface of the extension portion; and a frame, disposed near a bottom and a side of the backlight source, the frame having a bottom surface, a sidewall, a folding portion, and a catching portion, wherein the bottom surface and the sidewall are connected, the folding portion and the catching portion are connected to the sidewall respectively, the folding portion and the bottom surface have no overlapping region in a vertical projection direction, and the catching portion and the bottom surface have an overlapping region in the vertical projection direction, the catching portion can be extended above the light guide plate, and the optical coating layer is disposed corresponding to an opening formed between the folding portion and the sidewall; wherein the extension portion of the optical plate comprises a fold portion, and the fold portion is foldably extended into a space between the backlight source and the light incident end of the light guide plate; the surface of the extension portion comprises a fold portion, a non-fold portion, and a boundary between the fold portion and the non-fold portion, and the fold portion can be folded along the boundary, the optical coating layer is only formed on the non-fold portion of the surface instead of being formed on the fold portion of the surface, an edge of the optical coating layer is aligned with the boundary.