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

• US 8,525,968 B2
• Filed: 12/12/2012
• Issued: 09/03/2013
• Est. Priority Date: 10/22/1996
• Status: Expired due to Term

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Yasukawa, Masahiro
• Primary Examiner(s): Qi, Mike
• Application Number:
  US13/711,805
• Publication Number:
  US 20130120673A1
• Time in Patent Office: 265 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 substrate for a display panel, comprising:

a plurality of reflective parts that are formed in a pixel region, each of the plurality of reflective parts being positioned at a first position corresponding to one pixel of a plurality of pixels;

a plurality of first switching elements that are formed in the pixel region, each of the plurality of first switching elements being positioned at a second position corresponding to one pixel of the plurality of pixels;

a metal layer that overlaps at least a part of one first switching element of the plurality of first switching elements;

a driving circuit that is positioned outside of the pixel region, the driving circuit including a plurality of second switching elements; and

a wire that is positioned in the driving circuit, the wire being electrically connected to one second switching element of the plurality of second switching elements.

2. The substrate according to claim 1,

the metal layer being formed in a first layer in which the wire is formed.

3. The substrate according to claim 1,

a material constituting the metal layer being identical with a material constituting the wire.

4. The substrate according to claim 1,

the plurality of first switching elements being a plurality of first transistors,

a gate of one first transistor of the plurality of first transistors being formed between the first layer and a semiconductor region including a source and a drain of the one first transistor.

5. A display panel comprising:

the substrate of claim 1;

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

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

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

7. A projection display device comprising:

the electronic device of claim 6;

a light source;

the display panel modulating the light from the light source; and

a projection lens for projecting the light modulated by the display panel.

8. A substrate for a display panel, comprising:

a plurality of reflective parts that are formed in a pixel region, each of the plurality of reflective parts being positioned at a first position corresponding to one pixel of a plurality of pixels;

a plurality of first transistors that are formed in the pixel region, each of the plurality of first transistors being positioned at a second position corresponding to one pixel of the plurality of pixels;

a metal layer that overlaps at least a part of one first transistor of the plurality of first transistors;

a driving circuit that is positioned outside of the pixel region, the driving circuit including a plurality of second transistors; and

a wire that is positioned in the driving circuit, the wire being electrically connected to one second transistor of the plurality of second transistors.

9. The substrate according to claim 8,

the metal layer covering a first gate of the first transistor.

10. The substrate according to claim 8,

the metal layer covering at least a part of a first semiconductor region of the first transistor, the first semiconductor region including a first source and a first drain of the first transistor.

11. The substrate according to claim 10,

the first semiconductor region being formed in a well.

12. The substrate according to claim 8,

the wire being electrically connected to a third switching element of the plurality of second switching elements.

13. A substrate for a display panel, comprising:

a plurality of first switching elements that are formed in a pixel region;

a metal layer that overlaps at least a part of one first switching element of the plurality of first switching elements;

a driving circuit that is positioned outside of the pixel region, the driving circuit including a plurality of second switching elements; and

a wire that is positioned in the driving circuit, the wire being electrically connected to one second switching element of the plurality of second switching elements.

14. The substrate according to claim 13,

the metal layer being formed in a first layer in which the wire is formed.

15. The substrate according to claim 13,

a material constituting the metal layer being identical with a material constituting the wire.

16. The substrate according to claim 13,

the plurality of first switching elements being a plurality of first transistors,

a gate of one first transistor of the plurality of first transistors being formed between the first layer and a semiconductor region including a source and a drain of the one first transistor.

17. A substrate for a display panel, comprising:

a plurality of first transistors that are formed in a pixel region;

a metal layer that overlaps at least a part of one first transistors of the plurality of first transistors;

a driving circuit that is positioned outside of the pixel region, the driving circuit including a plurality of second transistors; and

a wire that is positioned in the driving circuit, the wire being electrically connected to one second transistor of the plurality of second transistors.

18. The substrate according to claim 17,

the metal layer being formed in a first layer in which the wire is formed.

19. The substrate according to claim 17,

a material constituting the metal layer being identical with a material constituting the wire.

20. The substrate according to claim 17,

a gate of one first transistor of the plurality of first transistors being formed between the first layer and a semiconductor region including a source and a drain of the one first transistor.