Display device and manufacturing method of display device

• US 7,821,587 B2
• Filed: 11/15/2006
• Issued: 10/26/2010
• Est. Priority Date: 12/01/2005
• Status: Expired due to Fees

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Hosoya, Kunio
• Primary Examiner(s): Le; Uyen-Chau N
• Assistant Examiner(s): Prince; Kajli
• Application Number:
  US11/599,347
• Publication Number:
  US 20070126955A1
• Time in Patent Office: 1,441 Days
• Field of Search: 349/43
• US Class Current: 349/43
• CPC Class Codes: G02F 1/133342 for double-sided displays
• CPC Class Codes: G02F 1/133351 Manufacturing of individual cells out of a plurality of cells, e.g. by dicing
• CPC Class Codes: G02F 1/133354 Arrangements for aligning or assembling substrates
• CPC Class Codes: G02F 1/133557 Half-mirrors
• CPC Class Codes: G02F 1/1362 Active matrix addressed cells G02F1/134336, G02F1/134363 take precedence
• CPC Class Codes: G02F 1/136231 for reducing the number of lithographic steps

Abstract

It is an object of the present invention to realize thinning, low power consumption, and improvement of an yield at the time of manufacture of a display device capable of double-sided display which is used for a piece of portable informational terminal equipment such as a cellular phone. A liquid crystal display device, including a first substrate 1a and a second substrate 1b, has a transmission type active-matrix first liquid crystal display device 3001 and a reflective type active-matrix second liquid crystal display device 3002, where the first substrate has a TFT region of the first liquid crystal display device and an opposite region of the second liquid crystal display device, and the second substrate has an opposite region of the first liquid crystal display device and a TFT region of the second liquid crystal display device.

Claims

1. A display device comprising:

a first substrate where a first thin film transistor region and a first opposite region are formed;

a second substrate where a second thin film transistor region and a second opposite region are formed; and

a first liquid crystal material and a second liquid crystal material;

wherein the first thin film transistor region and the second opposite region are opposed from each other with the first liquid crystal material interposed therebetween, and the second thin film transistor region and the first opposite region are opposed from each other with the second liquid crystal material interposed therebetween,

wherein a gate electrode formed in the first thin film transistor region and a black matrix formed in the first opposite region are in contact with the first substrate, and

wherein a gate electrode formed in the second thin film transistor region and a black matrix formed in the second opposite region are in contact with the second substrate.

2. The display device according to claim 1, further comprising a reflective electrode formed in the second thin film transistor region,

wherein the gate electrode formed in the second thin film transistor region and the reflective electrode formed in the second thin film transistor region are in contact with the second substrate.

3. The display device according to claim 1,

wherein interlayer insulating films formed in the first thin film transistor region, the second thin film transistor region, the first opposite region, and the second opposite region comprise the same material.

4. The display device according to claim 1,

wherein a first liquid crystal display device comprising the first thin film transistor region and the second opposite region is a transmission type liquid crystal display device, and

wherein a second liquid crystal display device comprising the second thin film transistor region and the first opposite region is a semi-transmission type liquid crystal display device.

5. The display device according to claim 1,

wherein the black matrix formed in the first opposite region and the black matrix formed in the second opposite region are interposed between the first substrate and the second substrate.

6. The display device according to claim 1,

wherein the gate electrode formed in the first thin film transistor region, the black matrix formed in the first opposite region, the gate electrode formed in the second thin film transistor region, and the black matrix formed in the second opposite region comprise the same material.

7. A display device comprising:

a first substrate where a first thin film transistor region and a first opposite region are formed;

a second substrate where a second thin film transistor region and a second opposite region are formed; and

a first liquid crystal material and a second liquid crystal material;

wherein the first thin film transistor region and the second opposite region are opposed from each other with the first liquid crystal material interposed therebetween, and the second thin film transistor region and the first opposite region are opposed from each other with the second liquid crystal material interposed therebetween,

wherein a wiring formed in the first thin film transistor region and a black matrix formed in the first opposite region are in contact with the first substrate, and

wherein a wiring formed in the second thin film transistor region and a black matrix formed in the second opposite region are in contact with the second substrate.

8. The display device according to claim 7, further comprising a reflective electrode formed in the second thin film transistor region,

wherein the wiring formed in the second thin film transistor region and the reflective electrode formed in the second thin film transistor region are in contact with the second substrate.

9. The display device according to claim 7,

wherein interlayer insulating films formed in the first thin film transistor region, the second thin film transistor region, the first opposite region, and the second opposite region comprise the same material.

10. The display device according to claim 7,

wherein a first liquid crystal display device comprising the first thin film transistor region and the second opposite region is a transmission type liquid crystal display device, and

wherein a second liquid crystal display device comprising the second thin film transistor region and the first opposite region is a semi-transmission type liquid crystal display device.

11. The display device according to claim 7,

wherein the black matrix formed in the first opposite region and the black matrix formed in the second opposite region are interposed between the first substrate and the second substrate.

12. The display device according to claim 7,

wherein the wiring formed in the first thin film transistor region, the black matrix formed in the first opposite region, the wiring formed in the second thin film transistor region, and the black matrix formed in the second opposite region comprise the same material.