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| OF THE DRAWINGS FIG. 1 is a schematic cross-sectional line drawing showing a coating in accordance ... |
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| Method for making rare earth metal oxide ceramic precursor compounds and use thereof |
| The following terms and words are used herein and are defined to mean the following: "preceramic ... |
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| Thermal barrier coating systems and materials |
| I claim: 1. A metallic article comprising a metallic substrate having a ceramic thermal barrier ... |
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| Thermal barrier layer and process for producing the same |
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| Coated parts with film having powder-skeleton structure, and method for forming coating |
| We claim: 1. A method for forming a coating on parts, comprising vibrating or stirring in a ... |
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| Cast iron alloy |
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| Tri-fold label or business form |
| This need is met by the present invention whereby a tri-fold label or business form is provided. T... |
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| Multiple label construction having two pressure-sensitive composites laminated together |
| A label according to a preferred embodiment of the invention includes two pressure-sensitive ... |
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| Glazing provided with a low-emissivity multilayer stack |
| OF THE INVENTION The invention is directed to a transparent substrate, especially a glass ... |
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Surface-type illumination device and liquid crystal display
| Details |
Inventors: Funamoto, Tatsuaki; Yagasaki, Toru; Akahane, Fumiaki;
Assignee: Seiko Epson Corporation (Tokyo, JP)
Primary Examiner: Sikes; William L.
Assistant Examiner: Dudek; James A.
Attorney, Agent or Firm: Janofsky; Eric B.
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. |
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DETAILED DESCRIPTION What is claimed is: 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.
2.
The illumination device of claim 1, wherein the cutout portion of said light guide plate has a shape of an isosceles triangle.
3.
The illumination device of claim 2, wherein the length of one side of the isosceles triangle is approximately 0.
6 times to 1.
0 times the smallest radius of curvature of a bent portion of said illuminant that forms the corner of the L shape.
4.
The illumination device of claim 2, further comprising a shield member, attached to the corner of said light guide plate, for reflecting away light from said illuminant.
5.
The illumination device of claim 1, wherein the cutout portion of said light guide plate has a diamond shape.
6.
The illumination device of claim 5, wherein the length of one side of the diamond shape is approximately 0.
6 times to 1.
0 times the smallest radius of curvature of a bent portion of said illuminant that forms the corner of the L shape.
7.
The illumination device of claim 5 further comprising a shield member, attached to the corner of said light guide plate, for reflecting array light from said illuminant.
8.
The illumination device of claim 1, wherein said light guide plate further includes a cutout portion at each of its corners.
9.
The illumination device of claim 1, further comprising a first reflector and a second reflector disposed along the two adjacent sides of said light guide plate and covering said L-shaped illuminant so as to direct the light emitted from said illuminant substantially toward said light guide plate
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Manufacturing Materials 
