Integral-type liquid crystal panel with image sensor function

• US 20010000676A1
• Filed: 12/29/2000
• Published: 05/03/2001
• Est. Priority Date: 10/20/1997
• Status: Active Grant

• Current Assignee: Hideaki Kuwabara, Hongyong Zhang, Masayuki Sakakura
• Original Assignee: Hideaki Kuwabara, Hongyong Zhang, Masayuki Sakakura
• Inventors: Kuwabara, Hideaki, Sakakura, Masayuki, Zhang, Hongyong
• Granted Patent: US 6,462,806 B2
• Time in Patent Office: Days
• US Class Current: 349/12
• CPC Class Codes: G02F 1/13312 Circuits comprising photodetectors for purposes other than feedback
• CPC Class Codes: G02F 1/133345 Insulating layers G02F1/1335, G02F1/1337, G02F1/135, G02F1/136 take precedence
• CPC Class Codes: G02F 1/135 Liquid crystal cells structurally associated with a photoconducting or a ferro-electric layer, the properties of which can be optically or electrically varied G02F1/133348 takes precedence
• 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 1/13624 having more than one switching element per pixel
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/13629 Multilayer wirings
• CPC Class Codes: H01L 27/12 the substrate being other than a semiconductor body, e.g. an insulating body
• CPC Class Codes: H01L 27/14665 Imagers using a photoconductor layer
• CPC Class Codes: H04M 1/0264 for a camera module assembly
• CPC Class Codes: H04M 1/0266 for a display module assembly
• CPC Class Codes: H04N 1/00127 Connection or combination of a still picture apparatus with another apparatus, e.g. for storage, processing or transmission of still picture signals or of information associated with a still picture
• CPC Class Codes: H04N 1/00129 with a display device, e.g. CRT or LCD monitor with a television apparatus H04N1/00283; arrangements for control of display devices G09G
• CPC Class Codes: H04N 1/028 for picture information pick-up
• CPC Class Codes: H04N 1/02805 with photodetectors arranged in a two-dimensional array

Abstract

A display device using a novel semiconductor device, which includes a pixel matrix, an image sensor, and a peripheral circuit for driving those, that is, which has both a camera function and a display function, and is made intelligent, is provided and a method of manufacturing the same is also provided. One pixel includes a semiconductor device for display and a semiconductor for light reception, that is, one pixel includes semiconductor devices (insulated gate-type field effect semiconductor device) for controlling both display and light reception, so that the display device having a picture reading function is made miniaturized and compact.

Claims

1. An integral-type liquid crystal display panel with an image sensor function, comprising:

a display portion made of a pixel matrix including at least pixel electrodes in matrix and a first semiconductor device connected to each of the pixel electrodes; and

a sensor portion including at least a photoelectric conversion element and a second semiconductor device connected to the photoelectric conversion element, which are disposed on a same substrate as the display portion,

wherein light from a back surface of the substrate is received by the sensor portion.

2. An integral-type liquid crystal display panel with an image sensor function, comprising:

a display portion made of a pixel matrix including at least pixel electrodes in matrix and a first semiconductor device connected to each of the pixel electrodes; and

a sensor portion including at least a photoelectric conversion element and a second semiconductor device connected to the photoelectric conversion element, which are disposed as the same substrate as the display portion,

wherein the display portion and the sensor portion have a same pixel size; and

light from a back surface of the substrate is received by the sensor portion.

3. An integral-type liquid crystal display panel with an image sensor function, comprising:

a display portion made of a pixel matrix including at least pixel electrodes in matrix and a first semiconductor device connected to each of the pixel electrodes; and

a sensor portion including at least a photoelectric conversion element and a second semiconductor device connected to the photoelectric conversion element, which are disposed on a same substrate as the display portion,

wherein the first semiconductor device and the second semiconductor device are provided in a same matrix; and

the pixel electrode connected to the first semiconductor device exists over the second semiconductor device.

4. An integral-type liquid crystal display panel with an image sensor function, comprising:

a display portion made of a pixel matrix including at least pixel electrodes in matrix and a first semiconductor device connected to each of the pixel electrodes; and

a sensor portion including at least a photoelectric conversion element and a second semiconductor device connected to the photoelectric conversion element, which are disposed on a same substrate as the display portion,

wherein the photoelectric conversion element includes at least an upper electrode, a photoelectric conversion layer, and a lower electrode;

the upper electrode is made of a metal having reflectivity to at least visible light; and

the lower electrode is made of a transparent conductive film.

5. A method of manufacturing an integral-type liquid crystal display panel with an image sensor function which comprises a pixel matrix including pixel electrodes disposed in matrix and a first semiconductor device connected to each of the pixel electrodes, and an image sensor with a light receiving portion including a photoelectric conversion element and a second semiconductor device connected to the photoelectric conversion element, the image sensor being disposed on the same substrate as the pixel matrix, and the method comprising:

a first step of forming the first semiconductor device and the second semiconductor device on the substrate;

a second step of forming a lower electrode connected to the second semiconductor device and made of a transparent conductive film;

a third step of forming a photoelectric conversion layer on the lower electrode; and

a fourth step of forming an upper electrode contacting on the photoelectric conversion layer.

6. A method of manufacturing an integral-type liquid crystal display panel with an image sensor function which comprises a pixel matrix including pixel electrodes disposed in matrix and a first semiconductor device connected to each of the pixel electrodes, and an image sensor with a light receiving portion including a photoelectric conversion element and a second semiconductor device connected to the photoelectric conversion element, which are disposed on the same substrate as the pixel matrix, and the method comprising:

a first step of forming the first semiconductor device and the second semiconductor device on the substrate;

a second step of forming a first insulating film covering at least the first semiconductor device and the second semiconductor device;

a third step of forming a transparent conductive film on the first insulating film;

a fourth step of forming a lower electrode connected to the second semiconductor device by patterning the transparent conductive film;

a fifth step of forming a photoelectric conversion layer on the lower electrode; and

a sixth step of forming an upper electrode contacting on the photoelectric conversion layer.

7. An integral-type liquid crystal panel, comprising:

a photoelectric conversion element including a lower electrode, a photoelectric conversion layer disposed on the lower electrode, and an upper electrode disposed on the photoelectric conversion layer; and

a sensor portion including at least one active element connected to the photoelectric conversion element and being disposed on an insulating substrate;

wherein;

the upper electrode is made of a metal having reflectivity to at least visible light; and

the lower electrode is made of a conductive film having transparency to at least visible light.

8. An integral-type liquid crystal display panel with an image sensor function, comprising:

a display portion made of a pixel matrix including at least pixel electrodes in matrix and an active element connected to each of the pixel electrodes; and

a sensor portion including at least a photoelectric conversion element and an active element group connected to each of the photoelectric conversion element, the sensor portion being disposed on a same substrate as the display portion,

wherein light from a back surface of the substrate is received by the sensor portion.

9. An integral-type liquid crystal display panel with an image sensor function, comprising:

a display portion made of a pixel matrix including at least pixel electrodes in matrix and an active element connected to each of the pixel electrodes; and

a sensor portion including at least a photoelectric conversion element and an active element group connected to the photoelectric conversion element, which are disposed on a same substrate as the display portion, wherein;

the display portion and the sensor portion have a same pixel size; and

light from a back surface of the substrate is received by the sensor portion.

10. An integral-type liquid crystal display panel with an image sensor function, comprising:

a display portion made of a pixel matrix including at least pixel electrodes in matrix and an active element connected to each of the pixel electrodes; and

a sensor portion including a photoelectric conversion element and an active element group connected to the photoelectric conversion element, which are disposed on a same substrate as the display portion, wherein;

the active element and the active element group are provided in a same matrix; and

the pixel electrode connected to the active element exists over the active element group.

12. An integral-type liquid crystal display panel with an image sensor function according to any one of

claims 8

to

11

, wherein the active element group includes at least an amplification transistor, a reset transistor, and a selection transistor.

11. An integral-type liquid crystal display panel with an image sensor function, comprising:

a display portion made of a pixel matrix including at least pixel electrodes in matrix and an active element connected to each of the pixel electrodes; and

a sensor portion including at least a photoelectric conversion element and an active element group connected to the photoelectric conversion element, which are disposed on a same substrate as the display portion;

wherein;

the photoelectric conversion element includes at least an upper electrode, a photoelectric conversion layer, and a lower electrode;

the upper electrode is made of a metal having reflectivity to at least visible light; and

the lower electrode is made of a transparent conductive film.

13. A method of manufacturing an integral-type liquid crystal display panel with an image sensor function which comprises a pixel matrix including pixel electrodes disposed in matrix and an active element group connected to the pixel electrodes, and an image sensor with a light receiving portion including a photoelectric conversion element and an active element group connected to the photoelectric conversion element, the image sensor being disposed on the same substrate as the pixel matrix, and the method comprising:

a first step of forming the active element and the active element group on the substrate;

a second step of forming a lower electrode connected to the active element group and made of a -transparent conductive film;

a third step of forming a photoelectric conversion layer on the lower electrode; and

a fourth step of forming an upper electrode contacting on the photoelectric conversion layer.

15. A method of manufacturing an integral-type liquid crystal display panel with an image sensor function according to

claim 13

or

14

, wherein the active element group includes at least an amplification transistor, a reset transistor, and a selection transistor.

14. A method of manufacturing an integral-type liquid crystal display panel with an image sensor function which comprises a pixel matrix including pixel electrodes disposed in matrix and an active element connected to each of the pixel electrodes, and an image sensor with a light receiving portion including a photoelectric conversion element and an active element group connected to the photoelectric conversion element, the image sensor being disposed on the same substrate as the pixel matrix, and the method comprising:

a first step of forming the active element and the active element group on the substrate;

a second step of forming a first insulating film covering at least the active element and the active element group;

a third step of forming a transparent conductive film on the first insulating film;

a fourth step of forming a lower electrode connected to the active element group by patterning the transparent conductive film;

a fifth step of forming a photoelectric conversion layer on the lower electrode; and

a sixth step of forming an upper electrode contacting on the photoelectric conversion layer.