Surface-type illumination device and liquid crystal display
First Claim
1. An illumination device comprising:
- a light guide plate which is polygon-shaped and substantially transparent; and
an elongated illuminant element formed to include a bent section, and facing at least first and second adjoining side edges of said light guide plate; and
wherein on a first surface of said light guide plate a diffusion pattern is formed in which an area density gradually increases or decreases throughout said first surface in the directions along said first and second side edges of said light guide plate to emit a substantially even light from a second surface of said light guide plate, and wherein said first and second side edges are adjacent.
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Abstract
A surface-type illumination device suitable for providing backlight in a liquid crystal display is disclosed. For example, an L-shaped fluorescent light can be used as an illuminant and mounted next to two edges of a substantially rectangular light guide plate. The corner of an edge portion between the two edges is removed. The fluorescent light, the length of whose illuminating portion is long, is positioned with an appropriate gap from the light guide plate allowing for illumination with high brightness and low power consumption. Consequently, when the illumination device is used in a color liquid crystal display, appropriate backlight with high brightness can be obtained. Moreover, because the influence of the temperature from the illumination device is small, a stable color display can be achieved.
65 Citations
14 Claims
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1. An illumination device comprising:
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a light guide plate which is polygon-shaped and substantially transparent; and an elongated illuminant element formed to include a bent section, and facing at least first and second adjoining side edges of said light guide plate; and wherein on a first surface of said light guide plate a diffusion pattern is formed in which an area density gradually increases or decreases throughout said first surface in the directions along said first and second side edges of said light guide plate to emit a substantially even light from a second surface of said light guide plate, and wherein said first and second side edges are adjacent. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A liquid crystal display device comprising:
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a light guide plate which is polygon-shaped and substantially transparent; an elongated illuminant element formed to include a bent section, and facing at least first and second adjoining side edges of said light guide plate; a liquid crystal display which is illuminated by light emitted from one surface of said light guide plate; and a driver which drives said liquid crystal display, said driver arranged along a side edge of said light guide plate; wherein on a first surface of said light guide plate a diffusion pattern is formed in which an area density gradually increases or decreases throughout said first surface in the directions along said first and second side edges of said light guide plate to emit a substantially even light from a second surface of said light guide plate, and wherein said first and second side edges are adjacent. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification