Electro-optical device

• US 20020017645A1
• Filed: 05/03/2001
• Published: 02/14/2002
• Est. Priority Date: 05/12/2000
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Goto, Yuugo, Yamazaki, Shunpei, Katsura, Hideki
• Granted Patent: US 7,804,552 B2
• Time in Patent Office: Days
• US Class Current: 257/72
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/13454 Drivers integrated on the active matrix substrate G02F1/136277 takes precedence
• CPC Class Codes: H01L 27/1214 comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
• CPC Class Codes: H01L 27/1259 Multistep manufacturing methods
• CPC Class Codes: H01L 27/127 with a particular formation, treatment or patterning of the active layer specially adapted to the circuit arrangement
• CPC Class Codes: H01L 27/14609 Pixel-elements with integrated switching, control, storage or amplification elements scanning details of imagers (circuitry of solid-state image sensors H04N25/00); circuitry of imagers H04N25/70
• CPC Class Codes: H01L 27/14621 Colour filter arrangements
• CPC Class Codes: H01L 27/14623 Optical shielding
• CPC Class Codes: H01L 29/66757 Lateral single gate single channel transistors with non-inverted structure, i.e. the channel layer is formed before the gate
• CPC Class Codes: H01L 29/78633 with a light shield

Abstract

An object of the present invention is to provide a pixel structure capable of shielding light between a TFT and a pixel without using a light shielding mask (black matrix) in an electro-optical display device. The present invention has a feature in that, as one of means for shielding light, a lamination film consisting of two colored layers (a lamination layer of a red-colored layer and a blue-colored layer) is formed on an opposing substrate as a light shielding portion so as to overlap with a TFT formed on a device electrode.

Claims

1. An electro-optical device comprising light shielding portions comprising a lamination of a first colored layer and a second colored layer,

wherein at least one of the light shielding portions is formed overlapping at least a channel forming region of switching elements.

2. A device according to claim 1, wherein the first colored layer is blue.

3. A device according to claim 1, wherein the second colored layer is red.

4. A device according to claim 1, wherein the light shielding portion is provided on a substrate formed with said switching elements.

5. A device according to claim 1, wherein the light shielding portion is provided on an opposing substrate.

6. A device according to claim 1, wherein the electro-optical device is a transmission type liquid crystal display device in which the pixel electrode is made of a transparent conductive film.

7. A device according to claim 1, wherein the electro-optical device is a personal computer, a video camera, a portable information terminal, a digital camera, a digital video disc player or an optical game machine.

8. An electro-optical device comprising:

a thin film transistor formed over a substrate; and

light shielding portions provided on an opposing substrate, said light shielding portions comprising a lamination of a first colored layer and a second colored layer,

wherein at least one of the light shielding portion is formed overlapping at least a channel forming region of the thin film transistor.

9. A device according to claim 8, wherein the first colored layer is blue.

10. A device according to claim 8, wherein the second colored layer is red.

11. A device according to claim 8, wherein the electro-optical device is a transmission type liquid crystal display device in which the pixel electrode is made of a transparent conductive film.

12. A device according to claim 8, wherein the electro-optical device is selected from the group consisting of a personal computer, a video camera, a portable information terminal, a digital camera, a digital video disc player or an optical game machine.

14. A device according to claim 13, wherein the first colored layer is blue.

15. A device according to claim 13, wherein the second colored layer is red.

16. A device according to claim 13, wherein the light shielding portions are provided on a substrate formed with switching elements connected to said pixel electrodes.

17. A device according to claim 13, wherein the light shielding portions are provided on an opposing substrate.

18. A device according to claim 13, wherein the electro-optical device is a transmission type liquid crystal display device in which the pixel electrode is made of a transparent conductive film.

19. A device according to claim 13, wherein the electro-optical device is selected from the group consisting of a personal computer, a video camera, a portable information terminal, a digital camera, a digital video disc player or an optical game machine.

20. A device according to claim 13, wherein said pixel electrodes connected a plurality of thin film transistor formed over a substrate, and wherein said the light shielding portions are formed overlapping channel forming regions of the thin film transistors.

13. An electro-optical device comprising:

a plurality of pixel electrodes; and

light shielding portions comprising a lamination of a first colored layer and a second colored layer,

wherein the light shielding portions are formed so as to cover regions between each of said pixel electrodes and its adjacent pixel electrodes.