Liquid crystal panel substrate, liquid crystal panel, and electronic device and projection display device using the same

• US 8,107,049 B2
• Filed: 12/06/2010
• Issued: 01/31/2012
• Est. Priority Date: 10/22/1996
• Status: Expired due to Fees

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Yasukawa, Masahiro
• Primary Examiner(s): Qi, Mike
• Application Number:
  US12/960,601
• Publication Number:
  US 20110075061A1
• Time in Patent Office: 421 Days
• Field of Search: 349/158, 349/113, 349/44
• US Class Current: 349/158
• CPC Class Codes: G02F 1/1313 specially adapted for a particular application
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/13454 Drivers integrated on the active matrix substrate G02F1/136277 takes precedence
• CPC Class Codes: G02F 1/1362 Active matrix addressed cells G02F1/134336, G02F1/134363 take precedence
• CPC Class Codes: G02F 1/136209 Light shielding layers, e.g. black matrix, incorporated in the active matrix substrate, e.g. structurally associated with the switching element
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G02F 2203/02 reflective
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 33/08 with a plurality of light emitting regions, e.g. laterally discontinuous light emitting layer or photoluminescent region integrated within the semiconductor body H01L27/15 takes precedence

Abstract

In a liquid crystal substrate in which a matrix of reflecting electrodes is formed on a substrate, a transistor is formed corresponding to each reflective electrode and a voltage is applied to the reflective electrode through the transistor. A silicon oxide film having a thickness of 500 to 2,000 angstroms is used as the passivation film and the thickness is set to a value in response to the wavelength of the incident light to maintain a substantially constant reflectance.

Claims

1. A liquid crystal panel substrate comprising:

a substrate;

a pixel region including at least a reflecting electrode and a first light shielding film, the first light shielding film interposed between the reflecting electrode and the substrate;

a switching element disposed outside the pixel region; and

a wire electrically connected to the switching element, the wire being formed in the same layer as the first light shielding film.

2. A liquid crystal panel substrate according to claim 1, further comprising a second light shielding film that is located above the switching element and that is formed from the same layer as the first light shielding film.

3. A liquid crystal panel substrate according to claim 1, the wire being electrically connected to a constant voltage.

4. A liquid crystal panel substrate according to claim 1, the wire being electrically connected to another device outside the pixel region.

5. A liquid crystal panel comprising:

the liquid crystal panel substrate of claim 1;

a transparent substrate having a counter electrode and being opposed to the liquid crystal panel substrate, the transparent substrate being separated from the liquid crystal panel substrate by a gap; and

a liquid crystal material encapsulated in the gap between the liquid crystal substrate and the transparent substrate.

6. An electronic device comprising the liquid crystal panel of claim 5 as a display section.

7. A projection display device comprising:

the electronic device of claim 6,

a light source, the liquid crystal panel modulating the light from the light source, and

a projection lens for projecting the light modulated by the liquid crystal panel.

8. A liquid crystal panel substrate comprising:

a substrate;

a pixel region including at least a pixel electrode and a first light shielding film, the first light shielding film interposed between the pixel electrode and the substrate;

a switching element disposed outside the pixel region; and

a wire electrically connected to the switching element, the wire being formed in the same layer as the first light shielding film.

9. A liquid crystal panel substrate according to claim 8, further comprising a second light shielding film that is located above the switching element and that is formed from the same layer as the first light shielding film.

10. A liquid crystal panel comprising:

the liquid crystal panel substrate of claim 8;

a transparent substrate having a counter electrode and being opposed to the liquid crystal panel substrate, the transparent substrate being separated from the liquid crystal panel substrate by a gap; and

a liquid crystal material encapsulated in the gap between the liquid crystal substrate and the transparent substrate.

11. An electronic device comprising the liquid crystal panel of claim 10 as a display section.

12. A projection display device comprising:

the electronic device of claim 11,

a light source, the liquid crystal panel modulating the light from the light source, and

a projection lens for projecting the light modulated by the liquid crystal panel.

13. A liquid crystal panel substrate comprising:

a substrate;

a pixel region including at least a first switching element and a first light shielding film, the first light shielding film covering the first switching element;

a second switching element disposed outside the pixel region; and

a wire electrically connected to the second switching element, the wire being formed in the same layer as the first light shielding film.

14. A liquid crystal panel substrate according to claim 13, further comprising a second light shielding film covering the second switching element, the second light shielding film being formed in the same layer as the first light shielding film.

15. A liquid crystal panel comprising:

the liquid crystal panel substrate of claim 13;

a transparent substrate having a counter electrode and being opposed to the liquid crystal panel substrate, the transparent substrate being separated from the liquid crystal panel substrate by a gap; and

a liquid crystal material encapsulated in the gap between the liquid crystal substrate and the transparent substrate.

16. An electronic device comprising the liquid crystal panel of claim 15 as a display section.

17. A projection display device comprising:

the electronic device of claim 16,

a light source, the liquid crystal panel modulating the light from the light source, and

a projection lens for projecting the light modulated by the liquid crystal panel.