LIGHT GUIDE PLATE AND LIQUID CRYSTAL DISPLAY HAVING THE SAME

• US 20080018812A1
• Filed: 07/06/2007
• Published: 01/24/2008
• Est. Priority Date: 08/20/2002
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Pak, Sang-Jin, Uh, Kee-Han, Cho, Jong-Whan, Park, Sang-Woo, Lim, Jae-Ik, Choi, Bang-Sil
• Granted Patent: US 7,583,326 B2
• Time in Patent Office: Days
• US Class Current: 349/12
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133504 Diffusing, scattering, diffracting elements associated to illuminating devices G02F1/133606
• CPC Class Codes: G02F 1/133528 Polarisers
• CPC Class Codes: G02F 1/133562 on the viewer side
• CPC Class Codes: G02F 1/13363 Birefringent elements, e.g. for optical compensation

Abstract

A liquid crystal display apparatus is disclosed. A first transparent electrode is disposed on an upper surface of the liquid crystal display panel for displaying an image. A second transparent electrode is disposed on a lower surface of a polarizer, and the second transparent electrode is opposite to the first transparent electrode. Accordingly, the entire thickness of the liquid crystal display apparatus may be decreased, and the manufacturing cost of the liquid crystal display apparatus may be reduced.

Claims

1. A liquid crystal display apparatus comprising:

a liquid crystal panel including a color filter substrate, a thin film transistor substrate and a liquid crystal interposed between the color filter substrate and the thin film transistor substrate; and

a touch panel on the color filter substrate, the touch panel including a first retardation film having a first transparent electrode and a second retardation film having a second transparent electrode spaced apart from the first transparent electrode and making contact with the first transparent electrode by an externally provided pressure to generate a position information of the pressure, at least one of the first and second retardation films including a plurality of scattering parts.

2. The liquid crystal display apparatus of claim 1, wherein the first retardation film comprises a plurality of first scattering parts, and the second retardation film comprises a plurality of second scattering parts.

3. The liquid crystal display apparatus of claim 2, wherein a size of each of the first and second scattering parts is from about 0.01 μ

m to about 200 μ

m.

4. The liquid crystal display apparatus of claim 2, wherein a summation of volume of the first scattering parts is about 10% to about 80% of a total volume of the first retardation film, and a summation of volume of the second scattering parts is about 10%to about 80% of a total volume of the second retardation film.

5. The liquid crystal display apparatus of claim 4, wherein a summation of volume of the first and second scattering parts is about 10% to about 80% of a total volume of the first and second retardation films.

6. The liquid crystal display apparatus of claim 2, wherein each of the first and second scattering parts comprise polyarylate.

7. The liquid crystal display apparatus of claim 2, wherein each of the first and second scattering parts comprises an air bubble.

8. The liquid crystal display apparatus of claim 1, further comprising:

a third retardation film disposed under the thin film transistor substrate; and

a fourth retardation film disposed under the third retardation film.

9. The liquid crystal display apparatus of claim 8, further comprising:

a first polarizer disposed on the second retardation film; and

a second polarizer disposed under the fourth retardation film.

10. The liquid crystal display apparatus of claim 9, wherein each of the first and third retardation films comprises a λ

/4 retardation film, and each of the second and fourth retardation films comprises a λ

/2 retardation film.

11. The liquid crystal display apparatus of claim 1, further comprising a plurality of dot spacers formed on one of corresponding surfaces of the first and second transparent electrodes.