Light guide and display device incorporating the same
A light guide and a display device incorporating the same are provided. The light guide includes a first surface, a second surface and a lateral surface. The first surface is for receiving a light beam. The second surface is for guiding the light beam and is opposite to the first surface. The second surface has an irregular structure for reducing a luminous flux of a total reflection of the light beam projected on the second surface. The lateral surface is for connecting the edges of the first surface and the second surface. Meanwhile, the luminous flux of the light beam from the first surface to the second surface is larger than the luminous flux of the light beam from the first surface to the lateral surface.
1 . A light guide, comprising:
a first surface for receiving a light beam;
a second surface for guiding the light beam, wherein the second surface is opposite to the first surface and has an irregular structure for reducing a luminous flux of a total reflection of the light beam projected on the second surface; and
a lateral surface for connecting the edges of the first surface and the second surface, wherein the luminous flux of the light beam from the first surface to the second surface is larger than the luminous flux of the light beam from the first surface and to the lateral surface.
2 . The light guide according to claim 1 , wherein the light guide is substantially a column, the first surface and the second surface substantially have the same shape, and the first surface is a circle or a polygon.
3 . The light guide according to claim 2 , wherein the diameter of a inscribed circle of the first surface is substantially larger than N times of a relative distance between the first surface and the second surface, N is larger than 1.
4 . The light guide according to claim 3 , wherein N is preferably equal to 1.72.
5 . The light guide according to claim 1 , wherein the irregular structure is a texture structure.
6 . The light guide according to claim 1 , wherein the light guide is made from a transparent material.
7 . a display device, comprising:
a housing;
a screen disposed on the front surface of the housing;
a light guide for guiding a light beam, the light guide comprising:
a first surface for receiving the light beam, wherein the first surface is disposed on the front surface of the housing;
a second surface for guiding the light beam, wherein the second surface is opposite to the first surface and has an irregular structure for reducing a luminous flux of a total reflection of the light beam projected on the second surface; and
a lateral surface for connecting the edges of the first surface and the second surface, wherein the luminous flux of the light beam from the first surface to the second surface is larger than the luminous flux of the light beam from the first surface to the lateral surface;
a light sensor disposed in the housing and opposite to the second surface, wherein the light sensor is for receiving the light beam guided by the second surface and outputting a signal accordingly; and
a controlling circuit for coupling the screen and the light sensor and adjusting the screen brightness according to the signal.
8 . The display device according to claim 7 , wherein the light guide is a column, the first surface and the second surface substantially have the same shape, and the first surface is a circle or a polygon.
9 . The display device according to claim 8 , wherein the diameter of a inscribed circle of the first surface is substantially larger than N times of a relative distance between the first surface and the second surface, N is larger than 1.
10 . The display device according to claim 9 , wherein N is preferably equal to 1.72.
11 . The display device according to claim 7 , wherein the irregular structure is a texture structure.
12 . The display device according to claim 7 , wherein the light guide is made from a transparent material.
13 . The display device according to claim 7 , wherein the light sensor is a charge couple device (CCD) or a complementary metal-oxide semiconductor (CMOS).
14 . The display device according to claim 7 , wherein the display device is a liquid crystal TV or a plasma TV.