Abstract: An optical lens is adapted for used in a light source that has an optical axis, and includes a light-entering surface, a light-exiting surface, and a modified reflection surface. The light-entering surface has two first ends. The light-exiting surface defines a light-exiting surface profile that is concave toward the light source and that has two second ends. The modified reflection surface defines two modified reflection surface profiles. Each of the first ends is connected to a corresponding one of the second ends by a corresponding one of the modified reflection surface profiles. The modified reflection surface profiles are concave in the same direction as the light-exiting surface profile.

Abstract: The invention relates to an optical lens utilized for disposing above a light source. The optical lens has rotational symmetry relative to the central axis thereof. The central axis of the optical lens aligns with the center of the light source. The optical lens includes a bottom surface, an emergence surface with arc shape, an incidence surface with arc and concave shape, a curved surface with annular and concave shape and a light diffusing structure. The emergence surface connects a side of the bottom surface. The incidence surface connects another side of the bottom surface and lies in the middle of the bottom surface. The curved surface lies on the bottom surface and connects the incidence surface. The light diffusing structure is disposed on the curved surface.

Abstract: An optical lens is adapted for used in a light source that has an optical axis, and includes a light-entering surface, a light-exiting surface, and a modified reflection surface. The light-entering surface has two first ends. The light-exiting surface defines a light-exiting surface profile that is concave toward the light source and that has two second ends. The modified reflection surface defines two modified reflection surface profiles. Each of the first ends is connected to a corresponding one of the second ends by a corresponding one of the modified reflection surface profiles. The modified reflection surface profiles are concave in the same direction as the light-exiting surface profile.

Abstract: A true color liquid crystal displaying device is disclosed in the present invention. The true color liquid crystal displaying device includes a light guide module, a LED light source, and a liquid crystal panel without a color filter. The light guide module includes a light guide body, an optical input portion and an emitting surface. The emitting surface includes an emitting area. The LED light source is disposed on the optical input portion of the light guide module for emitting RGB beams. The liquid crystal panel is disposed above the emitting surface of the light guide module. The emitting area aligns with a sub-pixel of the liquid crystal panel. The optical cable inside the light guide module guides the monochromatic beam from the LED light source to each corresponding sub-pixel of the liquid crystal panel, so that the RGB beams is the pixel of the true color performance.