Liquid crystal display apparatus

• US 20030142251A1
• Filed: 12/30/2002
• Published: 07/31/2003
• Est. Priority Date: 01/25/2002
• Status: Active Grant

• Current Assignee: TCL China Star Optoelectronics Technology Co. Ltd. (TCL Technology Group Corp.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Jang, Young-Kyu
• Granted Patent: US 7,333,168 B2
• Time in Patent Office: Days
• US Class Current: 349/110
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133753 with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle
• CPC Class Codes: G02F 1/133757 with different alignment orientations
• CPC Class Codes: G02F 1/133784 by rubbing

Abstract

In an LCD apparatus, a non-effective display region disposed between pixel electrodes and a declination line disposed on the pixel electrodes are covered by means of a light-leakage preventing layer, thereby preventing the light from being leaked through the non-effective display region and the declination line. Accordingly, it is possible to prevent the brightness of the light from being decreased and an image displayed through the LCD apparatus from being deteriorated in quality.

Claims

1. A liquid crystal display apparatus comprising:

a liquid crystal display panel including

a TFT substrate having pixels in which first electrodes and power supply means for supplying a power voltage to the first electrodes are respectively formed, and a first alignment layer on which at least one first alignment groove is formed by rubbing in a first rubbing direction,

a color filter substrate having second electrodes opposite to the first electrodes, a second alignment layer on which a second alignment groove is formed by rubbing in a second rubbing direction, and red, green and blue color filters, a liquid crystal interposed between the TFT substrate and the color filter substrate, the liquid crystal being tilted by the first and second alignment groove and being twisted when the power voltage is applied to the first and second electrodes, and

a light-leakage preventing means for masking a non-effective display region being displaced between the pixels and a light leakage region, the light leakage region being adjacent to the non-effective display region, being displaced over a portion of the first electrodes, a reverse tilted liquid crystal being over the portion of the first electrodes, and the reverse tilted liquid crystal being caused by a rubbing the first alignment groove in the first rubbing direction when the power voltage is applied to the first and second electrodes; and

a backlight assembly for providing a light to the liquid crystal display panel.

2. The apparatus of claim 1, wherein the light leakage region is extended from an edge of the first electrodes surrounded by the non-effective display region, the edge facing to the first rubbing direction, toward an center of the surface of the first electrodes by a predetermined width.

3. The apparatus of claim 2, wherein the light leakage region is formed in a same position of each of the first electrodes.

4. The apparatus of claim 2, wherein the light leakage region comprises a first and a second light leakage region, the first light leakage region being formed in a first edge of the first electrode, the first edge facing to the first rubbing direction, and the second light leakage region being formed in a second edge adjacent to the first edge.

5. The apparatus of claim 4, wherein the first light leakage region is parallel with a first line that drives the power supply means, and the second light leakage region is parallel with a second line that supplies the power voltage to the first electrodes through the power supply means.

6. The apparatus of claim 5, wherein the power supply means supplies the power voltage to the first electrodes arranged in parallel with the first line, the polarity of the power voltage being reversed alternately according as columns of the first electrodes change, and the light-leakage preventing means covers the first light leakage region and the non-effective display region in parallel with the first line in a band shape.

7. The apparatus of claim 5, wherein the non-effective display region in parallel with the second line is screened by overlapping two color filters selected from the red, green and blue color filters formed on the color filter substrate.

8. The apparatus of claim 7, wherein each of the red, green and blue color filters has the band shape in order to simultaneously screen the respective first electrodes disposed in a row direction.

9. The apparatus of claim 6, wherein the light-leakage preventing means comprises at least one metal thin layer that masks the light.

10. The apparatus of claim 5, wherein the power supply means supplies the power voltage to the first electrodes arranged in parallel with the second line, the polarity of the power voltage being reversed alternately according as rows of the first electrodes change, and the light-leakage preventing means covers the second light leakage region and the non-effective display region parallel with the second line in a band shape.

11. The apparatus of claim 5, wherein the non-effective display region parallel with the first line is covered by overlapping two color filters selected from the red, green and blue color filters formed on the color filter substrate.

12. The apparatus of claim 11, wherein each of the red, green and blue color filters has the band shape in order to simultaneously screen the respective first electrodes disposed in a column direction.

13. The apparatus of claim 10, wherein the light-leakage preventing means comprises at least one metal thin layer that masks the light.

14. The apparatus of claim 5, wherein the power supply means supplies the power voltage to the first electrodes, the polarity of the power voltage being reversed alternately by changing respective rows and columns of the first electrodes, and the light-leakage preventing means covers the first light leakage region, the second light leakage region and the non-effective display region in a lattice shape.

15. The apparatus of claim 14, wherein the light-leakage preventing means comprises at least one metal thin layer that masks the light.

16. The apparatus of claim 15, wherein the metal thin layer is a chromium thin layer.