Liquid crystal panel substrate with light-shielding film in a pixel region, liquid crystal panel, and electronic equipment and projection type display device both using the same to reduce light leakage

• US 8,634,045 B2
• Filed: 05/11/2012
• Issued: 01/21/2014
• 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): NGO, HUYEN LE
• Application Number:
  US13/469,969
• Publication Number:
  US 20120224112A1
• Time in Patent Office: 620 Days
• Field of Search: 349/44, 349/113, 349/114, 349/137, 349/138
• US Class Current: 349/114
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/133502 Antiglare, refractive index matching layers
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133553 Reflecting elements associated to illuminating devices G02F1/133605
• CPC Class Codes: G02F 1/134363 for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
• 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 1/136227 Through-hole connection of the pixel electrode to the active element through an insulation layer
• CPC Class Codes: G02F 1/136277 formed on a semiconductor substrate, e.g. of silicon
• CPC Class Codes: G02F 2203/02 reflective
• CPC Class Codes: H01L 27/12 the substrate being other than a semiconductor body, e.g. an insulating body
• CPC Class Codes: H04N 9/3141 Constructional details thereof details not peculiar to the presence of an electronic spatial light modulator G03B21/14

Abstract

A reflective-electrode-side substrate of a reflective-type liquid crystal panel substrate has a pixel region including a pixel electrode, reflecting part, a light shielding film, and a switching element. A periphery region in the periphery of the pixel region outside of the pixel region includes a driving circuit that includes at least one switching element, and a wiring layer that is electrically connected to the at least one switching element. The switching elements may consist of transistors. This configuration can reduce the amount of light leaking through spaces between pixel electrodes and prevent adverse effects on image quality.

Claims

1. A substrate for a display panel, comprising:

a plurality of reflecting parts that are formed in a pixel region, each of the plurality of reflecting 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 light shielding film that covers 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 electrically connected to one second switching element of the plurality of second switching elements.

2. The substrate according to claim 1,

one reflecting part of the plurality of reflecting parts including at least one of a metal and an aluminum.

3. The substrate according to claim 1,

the light shielding film being formed on a layer in which the wire is formed.

4. The substrate according to claim 3,

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 layer and a semiconductor region including a source and a drain of the one first transistor.

5. The substrate according to claim 1,

a material constituting the light shielding film being identical with a material constituting the wire.

6. 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.

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

8. 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.

9. A substrate for a display panel, comprising:

a plurality of reflecting parts that are formed in a pixel region, each of the plurality of reflecting 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 light shielding film that covers 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 electrically connected to one second transistor of the plurality of second transistors.

10. The substrate according to claim 9,

one reflecting part of the plurality of reflecting parts including at least one of a metal and an aluminum.

11. The substrate according to claim 9,

the light shielding film covering a first gate of the first transistor.

12. The substrate according to claim 9,

the light shielding film 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.

13. The substrate according to claim 12,

the first semiconductor region being formed in a well.

14. The substrate according to claim 9,

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