Surface-type illumination device and liquid crystal display
First Claim
1. An illumination device, comprising:
- a substantially transparent light guide plate having first and second surfaces opposite to each other and a diffusion pattern arranged on said first surface, said light guide plate including a cutout portion at a corner between its two adjacent sides; and
an L-shaped illuminant disposed around said cutout portion of said light guide plate such that said illuminant faces the two adjacent sides of said light guide plate, said illuminant introducing light into said light guide plate;
wherein said diffusion pattern causes light within said light guide plate to evenly emit out from said second surface of said light guide plate.
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Accused Products
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.
84 Citations
18 Claims
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1. An illumination device, comprising:
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a substantially transparent light guide plate having first and second surfaces opposite to each other and a diffusion pattern arranged on said first surface, said light guide plate including a cutout portion at a corner between its two adjacent sides; and an L-shaped illuminant disposed around said cutout portion of said light guide plate such that said illuminant faces the two adjacent sides of said light guide plate, said illuminant introducing light into said light guide plate; wherein said diffusion pattern causes light within said light guide plate to evenly emit out from said second surface of said light guide plate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An illumination device, comprising:
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a substantially rectangular light guide plate having a diffusion pattern arranged on its one surface and a cutout portion at a corner between its two adjacent sides, said diffusion pattern having a fixed area density; and an L-shaped illuminant disposed around said cutout portion of said light guide plate such that said illuminant faces the two adjacent sides of said light guide plate, said illuminant introducing light into said light guide plate; wherein said diffusion pattern causes light within said light guide plate to evenly emit out of said light guide plate. - View Dependent Claims (12, 13)
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14. A liquid crystal display device, comprising:
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a substantially rectangular light guide plate having first and second surfaces opposite to each other and a diffusion pattern arranged on said first surface, said light guide plate including a cutout portion at a corner between its two adjacent sides; an L-shaped illuminant disposed around said cutout portion of said light guide plate such that said illuminant faces the two adjacent sides of said light guide plate, said illuminant emitting light toward said light guide plate; a liquid crystal display which is illuminated by light emitted from said second surface of said light guide plate; and a driver which drives said liquid crystal display, said driver arranged along the two sides opposing the two adjacent sides of said light guide plate. - View Dependent Claims (15, 16, 17, 18)
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Specification