LIQUID-CRYSTAL DISPLAY, METHOD FOR PRODUCING LIQUID-CRYSTAL DISPLAY, AND ELECTRONIC DEVICE

• US 20080111779A1
• Filed: 09/05/2007
• Published: 05/15/2008
• Est. Priority Date: 11/13/2006
• Status: Abandoned Application

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: MATSUMOTO, Tomotaka
• Application Number:
  US11/850,095
• Publication Number:
  US 20080111779A1
• Time in Patent Office: Days
• US Class Current: 345/87
• CPC Class Codes: G02F 1/13312 Circuits comprising photodetectors for purposes other than feedback
• CPC Class Codes: G02F 1/133371 Cells with varying thickness of the liquid crystal layer
• CPC Class Codes: G02F 1/13338 Input devices, e.g. touch panels
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/042 by opto-electronic means
• CPC Class Codes: H01L 27/12 the substrate being other than a semiconductor body, e.g. an insulating body
• 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

Abstract

A liquid-crystal display, having a plurality of pixel areas and a plurality of photodetection areas for detecting light disposed in a two-dimensional manner, includes first switching elements each provided for the corresponding pixel area and switching the drive of the corresponding pixel area, and second switching elements formed on the same layer as the first switching elements and each switching a photosensor element provided for the corresponding photodetection area. First sensor electrodes connected to the photosensor elements are formed on the same layer as switching electrodes connected to the second switching elements.

Claims

1. A liquid-crystal display having a plurality of pixel areas and a plurality of photodetection areas for detecting light disposed in a two-dimensional manner, comprising:

first switching elements each provided for the corresponding pixel area and switching the drive of the corresponding pixel area; and

second switching elements formed on the same layer as the first switching elements and each switching a photosensor element provided for the corresponding photodetection area, wherein

first sensor electrodes connected to the photosensor elements are formed on the same layer as switching electrodes connected to the second switching elements.

2. The liquid-crystal display according to claim 1, wherein the first sensor electrodes are composed of a light-reflective material or a light-absorptive material, and cover the lower surfaces of the photosensor elements.

3. The liquid-crystal display according to claim 1, wherein second sensor electrodes connected to the photosensor elements are formed on the same layer as display electrodes provided for the pixel areas.

4. The liquid-crystal display according to claim 1, wherein the first switching elements and the second switching elements are thin-film transistors.

5. The liquid-crystal display according to claim 4, wherein the first switching elements and the second switching elements are mainly composed of polycrystalline silicon.

6. The liquid-crystal display according to claim 1, wherein the photosensor elements are multilayer PIN diodes.

7. The liquid-crystal display according to claim 6, wherein the photosensor elements are mainly composed of amorphous silicon.

8. The liquid-crystal display according to claim 1, further comprising:

a planarizing film formed on the first switching elements, the second switching elements, and the photosensor elements so as to flatten the surfaces of the elements; and

an alignment film formed on the planarizing film so as to regulate the initial orientation of liquid-crystal molecules.

10. An electronic device comprising:

the liquid-crystal display according to claim 1.

9. A method for producing a liquid-crystal display having a plurality of pixel areas and a plurality of photodetection areas for detecting light disposed in a two-dimensional manner, comprising:

forming of first switching elements that drive the pixel areas and second switching elements that drive the photodetection areas on the same layer; and

forming of photosensor elements driven by the second switching elements, wherein

first sensor electrodes connected to the photosensor elements are formed on the same layer as switching electrodes connected to the second switching elements.