Semiconductor device and manufacturing method thereof

• US 8,513,666 B2
• Filed: 09/06/2011
• Issued: 08/20/2013
• Est. Priority Date: 01/26/2000
• Status: Expired due to Fees

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Yamazaki, Shunpei, Koyama, Jun
• Primary Examiner(s): MENZ, LAURA MARY
• Application Number:
  US13/225,634
• Publication Number:
  US 20110317108A1
• Time in Patent Office: 714 Days
• Field of Search: 257/59, 349/106, 349/158
• US Class Current: 257/59
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/136213 Storage capacitors associated with the pixel electrode
• 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 2203/02 reflective
• CPC Class Codes: H01L 21/32136 using plasmas
• CPC Class Codes: H01L 27/124 with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits wiring structures per se H01L23/52
• CPC Class Codes: H01L 27/1255 integrated with passive devices, e.g. auxiliary capacitors
• CPC Class Codes: H01L 27/1288 employing particular masking sequences or specially adapted masks, e.g. half-tone mask
• 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 29/78621 with LDD structure or an extension or an offset region or characterised by the doping profile
• CPC Class Codes: H01L 29/78627 with a significant overlap between the lightly doped drain and the gate electrode, e.g. GOLDD
• CPC Class Codes: H01L 29/78633 with a light shield

Abstract

The aperture ratio of a pixel of a reflecting type display device is improved without increasing the number of masks and without using a black mask. Locations for light shielding between pixels are arranged such that a pixel electrode overlaps with a portion of a gate wiring and a source wiring. In locations for shielding TFTs, a high pixel aperture ratio is realized by forming a color filter (red, or lamination of red and blue), formed on an opposing substrate.

Claims

1. A display device comprising:

a gate wiring, a source wiring, and a pixel electrode over a first substrate;

a red color filter, a green color filter, and a blue color filter over a second substrate; and

a liquid crystal and a spacer between the first substrate and the second substrate,

wherein the pixel electrode includes a portion overlapped with the gate wiring, and a portion overlapped with the source wiring,

wherein the spacer includes a portion where the red color filter, the green color filter, and the blue color filter are overlapped with each other, and

wherein the blue color filter is interposed between the red color filter and the green color filter.

2. The display device according to claim 1, further comprising an overcoat layer comprising resin over the red color filter, the green color filter, and the blue color filter.

3. The display device according to claim 1, wherein the spacer has a thickness of 2 to 7 μ

m.

4. The display device according to claim 1, wherein the display device is incorporated in one selected from the group consisting of a personal computer, a video camera, a portable information terminal, a digital camera, a digital video disk player, and an electronic amusement device.

5. A display device comprising:

a gate wiring, a source wiring, a capacitor wiring, and a pixel electrode over a first substrate;

a red color filter, a green color filter, and a blue color filter over a second substrate; and

a liquid crystal and a spacer between the first substrate and the second substrate,

wherein the pixel electrode includes a portion overlapped with the gate wiring, a portion overlapped with the source wiring, and a portion overlapped with the capacitor wiring,

wherein the spacer includes a portion where the red color filter, the green color filter, and the blue color filter are overlapped with each other, and

wherein the blue color filter is interposed between the red color filter and the green color filter.

6. The display device according to claim 5, wherein the capacitor wiring extends in parallel with the gate wiring.

7. The display device according to claim 5, further comprising an overcoat layer comprising resin over the red color filter, the green color filter, and the blue color filter.

8. The display device according to claim 5, wherein the spacer has a thickness of 2 to 7 μ

m.

9. The display device according to claim 5, wherein the display device is incorporated in one selected from the group consisting of a personal computer, a video camera, a portable information terminal, a digital camera, a digital video disk player, and an electronic amusement device.