Liquid Crystal Display Device

• US 20070263143A1
• Filed: 05/08/2007
• Published: 11/15/2007
• Est. Priority Date: 05/10/2006
• Status: Active Grant

• Current Assignee: Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Liquid Crystal Display Company Limited (Panasonic Holdings Corporation)
• Inventors: Igeta, Koichi, Tanno, Junji, Nagata, Tetsuya, Imayama, Hirotaka
• Granted Patent: US 7,777,842 B2
• Time in Patent Office: Days
• US Class Current: 349/110
• CPC Class Codes: G02F 1/133371 Cells with varying thickness of the liquid crystal layer
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133555 Transflectors
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]

Abstract

To improve the reflectivity or the transmissivity significantly, there is provided a liquid crystal display device including a liquid crystal display panel having a pair of substrates and liquid crystal sandwiched between the pair of substrates. The liquid crystal display panel includes a plurality of subpixels each having an active element, a pixel electrode, and an counter electrode, in which an electric field is generated by the pixel electrode and the counter electrode to drive the liquid crystal. The liquid crystal display device includes a light shielding film and a color filter formed on a first substrate of the pair of substrates; a scanning line for supplying the active element with scanning voltage, the scanning line being formed on a second substrate of the pair of substrates. The boundary region between the subpixels adjacent along the scanning line has no light-shielding film and no color filter.

Claims

1. A liquid crystal display device including a liquid crystal display panel having a pair of substrates and liquid crystal sandwiched between the pair of substrates, the liquid crystal display panel including a plurality of subpixels, the plurality of subpixels each having an active element, a pixel electrode, and an counter electrode, in which an electric field is generated by the pixel electrode and the counter electrode to drive the liquid crystal, the liquid crystal display device comprising

a light shielding film;

a color filter, the light shielding film and the color filter being formed on a first substrate of the pair of substrates; and

a scanning line for supplying the active element with scanning voltage, the scanning line being formed on a second substrate of the pair of substrates;

wherein the boundary region between the subpixels adjacent along the scanning line has no light-shielding film and no color filter.

2. The liquid crystal display device according to claim 1, wherein

the pixel electrode includes a plurality of comb electrodes;

and

at least one of the plurality of comb electrodes is disposed in the boundary region.

3. The liquid crystal display device according to claim 1, wherein

the pixel electrode includes a plurality of comb electrodes;

and

the distance between the comb electrode of the plurality of comb electrodes closest to the video line and the center of the video line is within 6 μ

m.

4. The liquid crystal display device according to claim 3, wherein

the distance between the comb electrode of the plurality of comb electrodes closest to the video line and the center of the video line is within 5 μ

m.

5. The liquid crystal display device according to claim 4, wherein

the distance between the comb electrode of the plurality of comb electrodes closest to the video line and the center of the video line is within 4 μ

m.

6. The liquid crystal display device according to claim 1, wherein the pixel electrode and the counter electrode are formed on the second substrate.

7. The liquid crystal display device according to claim 1, wherein

the pixel electrode and the counter electrode are formed on the second substrate;

and

the counter electrode constitutes a reflecting electrode.

8. The liquid crystal display device according to claim 1, wherein

each of the subpixels includes a transmitting section and a reflecting section;

the pixel electrode and the counter electrode are formed on the second substrate;

the reflecting section of the counter electrode constitutes a reflecting electrode; and

the first substrate has a recessed layer in the region facing the reflecting section.

9. The liquid crystal display device according to claim 8, wherein the boundary region having no light-shielding film and no color filter is the boundary region between the reflecting sections of the subpixels.

10. The liquid crystal display device according to claim 8, wherein the first substrate has an optical element that controls the polarization of light in the region facing the reflecting section.

11. The liquid crystal display device according to claim 7, wherein the reflecting electrode is made of a metal film formed on the counter electrode.

12. The liquid crystal display device according to claim 6, further comprising

an interlayer insulating film on the counter electrode, wherein

the pixel electrode is formed on the interlayer insulating film.

13. The liquid crystal display device according to claim 1, wherein

the pixel electrode is formed on the second substrate;

and

the counter electrode is formed on the first substrate.

14. The liquid crystal display device according to claim 1, wherein

each of the subpixels includes a transmitting section and a reflecting section;

the pixel electrode is formed on the second substrate;

the counter electrode is formed on the first substrate;

the reflecting section of the counter electrode constitutes a reflecting electrode; and

the first substrate has a recessed layer in the region facing the reflecting section.

15. The liquid crystal display device according to claim 13, wherein the boundary region having no light-shielding film and no color filter is the boundary region between the reflecting sections of the subpixels.