Display device and method of manufacturing the same
View Patent ↗There is provided a display device capable of automatically controlling a luminance in response to a brightness of a surrounding. The display device has a gamma correction circuit for converting an image signal voltage into a drive voltage for gray scale display and a photosensor for controlling an input and output voltage characteristic of the gamma correction circuit in response to the brightness of the surrounding. In this case, the gamma correction circuit for converting the image signal voltage into the driver voltage for gray scale display is formed on a first substrate. The photosensor for controlling the input and output voltage characteristic of the gamma correction circuit in response to the brightness of the surrounding is formed on a second substrate. The second substrate is fixed to the first substrate.
1. A display device comprising:
a substrate having a display portion;
a gamma correction circuit provided over said substrate;
an image signal processing circuit provided over said substrate and connected with an output line of said gamma correction circuit; and
a plurality of photosensors provided over said substrate for changing an output voltage of the gamma correction circuit in accordance with a brightness of a surrounding.
2. A display device according to claim 1 , wherein said display device is a liquid crystal display device or an electroluminescence display device.
3. A display device according to claim 1 , wherein each of said photosensors has a photoelectric conversion layer comprising amorphous silicon.
4. A display device according to claim 1 , wherein said display device is incorporated into an electronic equipment selected from the group consisting of a video camera, a digital camera, a projector, a head-mounted display, a car navigation system, a car stereo, a personal computer, and a portable information terminal.
5. A display device comprising:
a substrate having a display portion;
a plurality of photosensors provided over the display portion for detecting a brightness of a surrounding; and
a gamma correction circuit provided over said substrate for outputting a voltage for determining a period that a pixel is in a light state in accordance with electrical signals from said plurality of photo sensors.
6. A display device according to claim 5 , wherein said display device is a liquid crystal display device or an electroluminescence display device.
7. A display device according to claim 5 , wherein each of said photosensors has a photoelectric conversion layer comprising amorphous silicon.
8. A display device according to claim 5 , wherein said display device is incorporated into an electronic equipment selected from the group consisting of a video camera, a digital camera, a projector, a head-mounted display, a car navigation system, a car stereo, a personal computer, and a portable information terminal.
9. A display device comprising:
a plurality of photosensors provided over a peripheral portion of a substrate;
a source follower circuit connected with said plurality of photosensors;
a gamma correction circuit connected with said source follower circuit;
an image signal processing circuit connected with said gamma correction circuit;
a source signal line driver circuit connected with said image signal processing circuit; and
a pixel portion which is connected with said source signal line driver circuit and formed over said substrate.
10. A display device according to claim 9 , wherein said pixel portion has at least a pixel electrode, a liquid crystal layer, and a counter electrode.
11. A display device according to claim 9 , wherein said pixel portion has at least a pixel electrode and a light emitting layer.
12. A display device according to claim 9 , wherein each of said photosensors has a photoelectric conversion layer comprising amorphous silicon.
13. A display device according to claim 9 , wherein said display device is incorporated into an electronic equipment selected from the group consisting of a video camera, a digital camera, a projector, a head-mounted display, a car navigation system, a car stereo, a personal computer, and a portable information terminal.
14. A display device comprising:
a first substrate;
a second substrate;
a plurality of photosensors which are formed over said second substrate and fixed to an outer portion of said first substrate;
a source follower circuit connected with said plurality of photo sensors;
a gamma correction circuit connected with said source follower circuit;
an image signal processing circuit connected with said gamma correction circuit;
a source signal line driver circuit connected with said image signal processing circuit; and
a pixel portion which is connected with said source signal line driver circuit and formed over said first substrate.
15. A display device according to claim 14 , wherein said pixel portion has at least a pixel electrode, a liquid crystal layer, and a counter electrode.
16. A display device according to claim 14 , wherein said pixel portion has at least a pixel electrode and a light emitting layer.
17. A display device according to claim 14 , wherein each of said photosensors has a photoelectric conversion layer comprising amorphous silicon.
18. A display device according to claim 14 , wherein said display device is incorporated into an electronic equipment selected from the group consisting of a video camera, a digital camera, a projector, a head-mounted display, a car navigation system, a car stereo, a personal computer, and a portable information terminal.
19. A display device comprising:
a substrate having a display portion;
a gamma correction circuit formed adjacent said substrate;
an image signal processing circuit formed adjacent said substrate and connected with an output line of said gamma correction circuit; and
a plurality of photosensors formed adjacent said substrate for changing an output voltage of the gamma correction circuit in accordance with a brightness of a surrounding,
wherein each of said photosensors has a photoelectric conversion layer comprising amorphous silicon.
20. A display device according to claim 19 , wherein said display device is a liquid crystal display device or an electroluminescence display device.
21. A display device according to claim 19 , wherein said display device is incorporated into an electronic equipment selected from the group consisting of a video camera, a digital camera, a projector, a head-mounted display, a car navigation system, a car stereo, a personal computer, and a portable information terminal.