Method for illuminating liquid crystal display device, a back-light assembly for performing the same, and a liquid crystal display device using the same
First Claim
1. A liquid crystal display (LCD), comprising:
- an LCD panel;
a light source;
a light guide plate adjoining the light source;
a diffuser formed between the LCD panel and the light guide plate;
a condenser formed between the LCD panel and the diffuser; and
a high luminance condensing sheet formed between the LCD panel and the condenser,wherein the high luminance condensing sheet comprises a transparent sheet having a predetermined thickness, a diffusion layer formed at the lower surface of the transparent sheet, and a condensing layer formed at the upper surface of the transparent sheet.
1 Assignment
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Accused Products
Abstract
A method for illuminating a liquid crystal display device, a back-light assembly for performing the same and a liquid crystal display device using the same can improve the front luminance and production yield. Lights from a lamp is incident to a LCD panel side, which are then primarily diffused for a uniformity of the luminous flux of the incident lights. The luminous flux of the primarily diffused lights is condensed with respect to a first orientation component on a plane in parallel with the LCD panel, and then partially and secondarily diffused for extending a view angle of pixels of the LCD panel. After the luminous flux of the secondarily diffused lights is condensed with respect to a second orientation component perpendicular to the first orientation on the parallel plane, the condensed lights are illuminated onto the LCD panel. A diffusion sheet for secondarily diffusing the luminous flux and a condensing sheet for condensing the second orientation component are formed by a single sheet to reduce the manufacturing process of the liquid crystal display device. Also, a defect produced from respective sheets is minimized to enhance the yield.
18 Citations
8 Claims
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1. A liquid crystal display (LCD), comprising:
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an LCD panel; a light source; a light guide plate adjoining the light source; a diffuser formed between the LCD panel and the light guide plate; a condenser formed between the LCD panel and the diffuser; and a high luminance condensing sheet formed between the LCD panel and the condenser, wherein the high luminance condensing sheet comprises a transparent sheet having a predetermined thickness, a diffusion layer formed at the lower surface of the transparent sheet, and a condensing layer formed at the upper surface of the transparent sheet. - View Dependent Claims (2, 3, 4, 5)
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6. A liquid crystal display (LCD), comprising:
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an LCD panel; a light source; a light guide plate adjoining the light source; a diffuser formed between the LCD panel and the light guide plate; and a condenser formed between the LCD panel and the diffuser, wherein the diffuser comprises a plurality of beads formed on at least a surface of the diffuser adjacent to the light guide plate and a surface of the diffuser adjacent to the condenser, and the plurality of beads are distributed to have a higher density at the surface of the diffuser adjacent to the condenser than that at the surface of the diffuser adjacent to the light guide plate.
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7. A liquid crystal display (LCD), comprising:
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an LCD panel; a light source; a light guide plate adjoining the light source; a diffuser formed between the LCD panel and the light guide plate; and a condenser formed between the LCD panel and the diffuser, wherein the diffuser comprises a plurality of beads formed on a surface of the diffuser adjacent to the light guide plate distributed to have a higher density than a plurality of beads formed on a surface of the diffuser adjacent to the condenser so that the surface of the diffuser adjacent to the condenser has a haze value that is larger than that of the surface of the diffuser adjacent to the light guide plate.
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8. A liquid crystal display (LCD), comprising:
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an LCD panel; a light Source; a light guide plate adjoining the light source; a diffuser formed between the LCD panel and the light guide plate; a condenser formed between the LCD panel and the diffuser; and a high luminance condensing sheet formed between the LCD panel and the condenser, wherein the diffuser comprises a plurality of beads formed on a surface of the diffuser adjacent to the light guide plate distributed to have a higher density than a plurality of beads formed on a surface of the diffuser adjacent to the condenser so that the surface of the diffuser adjacent to the condenser has a haze value that is larger than that of the surface of the diffuser adjacent to the light guide plate to allow the reflectivity of the light incident from the light guide plate to be higher than the light transmission so that the incident light is primarily diffused for uniformly distributing the luminous flux of the incident light.
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Specification