LIQUID CRYSTAL DISPLAY DEVICE AND A METHOD OF MANUFACTURING THE SAME

• US 20090207153A1
• Filed: 02/10/2009
• Published: 08/20/2009
• Est. Priority Date: 02/20/2008
• Status: Active Grant

• Current Assignee: Japan Display West Incorporated (Japan Display Incorporated)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Kunii, Masafumi, Ito, Ryoichi, Ikeda, Masanobu
• Granted Patent: US 8,686,971 B2
• Time in Patent Office: Days
• US Class Current: 345/175
• CPC Class Codes: G02F 1/1345 Conductors connecting electrodes to cell terminals
• CPC Class Codes: G02F 1/1354 having a particular photoconducting structure or material
• CPC Class Codes: G02F 1/1362 Active matrix addressed cells G02F1/134336, G02F1/134363 take precedence

Abstract

Disclosed herein is a liquid crystal display device including a liquid crystal panel having a first substrate, a second substrate facing the first substrate, a liquid crystal layer disposed between the first substrate and the second substrate, and first and second electrodes formed on a surface side, of the first substrate, facing the second substrate, a transverse electric field being applied to the liquid crystal layer through the first and second electrodes, thereby displaying an image in a pixel area; wherein the first substrate includes: a light receiving element provided on the surface, of the first substrate, facing the second substrate, for receiving an incident light on a light receiving surface thereof, thereby forming data on the received light; and a planarizing film provided on the surface side, of the first substrate, facing the second substrate so as to cover the light receiving element.

Claims

1. A liquid crystal display device including

a liquid crystal panel having

a first substrate,

a second substrate facing said first substrate,

a liquid crystal layer disposed between said first substrate and said second substrate, and

first and second electrodes formed on a surface side, of said first substrate, facing said second substrate,

a transverse electric field being applied to said liquid crystal layer through said first and second electrodes, thereby displaying an image in a pixel area;

wherein said first substrate comprises;

a light receiving element provided on the surface, of said first substrate, facing said second substrate, for receiving an incident light made incident from a side of said second substrate to a side of said first substrate through said liquid crystal layer on a light receiving surface thereof, thereby forming data on the received light; and

a planarizing film provided on the surface side, of said first substrate, facing said second substrate so as to cover said light receiving element;

said first and second electrodes are provided on said planarizing film in said pixel area, an insulating film being interposed between said first and second electrodes; and

said insulating film is provided in an area corresponding to a sensor area having said light receiving element provided therein on a surface of said planarizing film.

2. The liquid crystal display device according to claim 1, wherein

said first substrate comprises:

a pixel switching element provided on the side of the surface, of said first substrate, facing said second substrate;

the plurality of switching elements are provided so as to correspond to a plurality of pixels, respectively, in said pixel area,

said planarizing film is formed so as to cover the plurality of switching elements,

said first electrode is provided as a common electrode common to said plurality of pixels in said pixel area on said planarizing film,

said insulating film is provided on said planarizing film so as to cover said first electrode, and

said second electrode is a pixel electrode connected to said pixel switching element, and the plurality of second electrodes are provided on said insulating film so as to correspond to said plurality of pixels, respectively.

3. The liquid crystal display device according to claim 2, wherein in said liquid crystal panel, a peripheral drive circuit for driving said pixel switching element and said light receiving element is formed in a circumferential area located in a circumference of said pixel area on said first substrate;

and

said first and second electrodes are not formed in said circumferential area, but are formed in said pixel area.

4. The liquid crystal display device according to claim 3, comprising:

a position detecting portion configured to detect a position of an object to be detected which is moved on a surface of said liquid crystal panel on the side of said second substrate;

wherein the plurality of light receiving elements are disposed in said pixel area; and

said position detecting portion detects the position of said object to be detected based on data on the received light generated by the plurality of light receiving elements.

5. The liquid crystal display device according to claim 4, further comprising:

a radiating portion configured to emit a radiation light to a surface of said liquid crystal panel on the side of said first substrate;

wherein said liquid crystal panel is structured in a way that the radiation light emitted from said radiating portion is transmitted from the surface of said liquid crystal panel on the side of said first substrate to the surface of said liquid crystal panel on the side of said second substrate, and the image is displayed in said pixel area based on the radiation light thus transmitted; and

said light receiving element receives a reflected light obtained by reflecting the radiation light emitted from said radiating portion and transmitted through said liquid crystal panel by said object to be detected on said light receiving surface thereof.

6. The liquid crystal display device according to claim 5, wherein said radiating portion is structured to emit a visible light and an invisible light as the radiation light.

7. A method of manufacturing a liquid crystal display device including a liquid crystal panel having a first substrate, a second substrate facing said first substrate, and a liquid crystal layer disposed between said first substrate and said second substrate, first and second electrodes through which a transverse electric field is applied to said liquid crystal layer in a pixel area being provided on a surface side, of said first substrate, facing said second substrate, said manufacturing method comprising the steps of:

forming a light receiving element for receiving an incident light made incident from a side of said second substrate to a side of said first substrate through said liquid crystal layer in said pixel area on a light receiving surface thereof, thereby forming data on the received light on the surface, of said first substrate, facing said second substrate;

forming a planarizing film covering said light receiving element in said pixel area on the surface, of said first substrate, facing said second substrate; and

forming an insulating film interposed between said first and second electrodes in said pixel area on the surface, of said first substrate, facing said second substrate;

wherein in the step of forming said insulating film, said insulating film is formed in an area corresponding to a sensor area having said light receiving element provided therein on a surface of said planarizing film, and etching processing for removing said insulating film formed on the surface of said planarizing film in said sensor area is not carried out.