Display device with semiconductor memory cell
The present invention provides a display device including a nonvolatile memory circuit to which data can be added without increasing the number of manufacturing steps, and an electronic appliance using the display device. A display device of the present invention has a memory circuit that includes a memory element with a simple structure in which an organic compound layer is interposed between a pair of conductive layers. According to the present invention having the above mentioned structure, a display device having a nonvolatile memory circuit to which data can be added can be provided without increasing the number of manufacturing steps.
1. A display device comprising:
a plurality of pixels for displaying an image provided over a substrate; and
a plurality of memory cells for storing data provided over the substrate,
wherein each of the plurality of pixels has a light emitting element,
wherein each of the plurality of memory cells has a memory element,
wherein the light emitting element comprises a first conductive layer, a first organic compound layer over and in contact with the first conductive layer, and a second conductive layer over and in contact with the first organic compound layer,
wherein the memory element comprises a third conductive layer, a second organic compound layer over and in contact with the third conductive layer, and a fourth conductive layer over and in contact with the second organic compound layer, and
wherein the first organic compound layer and the second organic compound layer are formed from a same material and formed in a same plane.
2. The display device according to claim 1 , wherein a conducting property of the memory element is changed by an optical effect.
3. The display device according to claim 1 , wherein a resistance of the memory element is changed by an optical effect.
4. The display device according to claim 1 , wherein a resistance of the memory element is changed by an electric effect.
5. The display device according to claim 1 , wherein a distance between the third conductive layer and the fourth conductive layer is changed by an electric effect.
6. The display device according to claim 1 , wherein the second organic compound layer is made from a conjugated polymer material doped with a photo acid generator.
7. An electronic appliance using the display device as disclosed in claim 1 .
8. The display device according to claim 1 , further comprising a driver circuit portion including a transistor,
wherein the driver circuit portion is provided between the plurality of pixels and the plurality of memory cells.
9. A display device comprising:
a pixel portion for displaying an image provided over a substrate, and
a memory cell portion for storing data provided over the substrate,
wherein the pixel portion has a plurality of pixels,
wherein the memory cell portion has a plurality of memory cells,
wherein each of the plurality of pixels has a light emitting element and a first transistor,
wherein each of the plurality of memory cells has a memory element and a second transistor,
wherein the light emitting element comprises a first conductive layer, a first organic compound layer over and in contact with the first conductive layer, and a second conductive layer over and in contact with the first organic compound layer,
wherein the memory element comprises a third conductive layer, a second organic compound layer over and in contact with the third conductive layer, and a fourth conductive layer over and in contact with the second organic compound layer,
wherein the first conductive layer is connected to a source region or a drain region of the first transistor,
wherein the third conductive layer is connected to a source region or a drain region of the second transistor, and
wherein the first organic compound layer and the second organic compound layer are formed from a same material and formed in a same plane.
10. The display device according to claim 9 , wherein a conducting property of the memory element is changed by an optical effect.
11. The display device according to claim 9 , wherein a resistance of the memory element is changed by an optical effect.
12. The display device according to claim 9 , wherein a resistance of the memory element is changed by an electric effect.
13. The display device according to claim 9 , wherein a distance between the third conductive layer and the fourth conductive layer is changed by an electric effect.
14. The display device according to claim 9 , wherein the second organic compound layer is made from a conjugated polymer material doped with a photo acid generator.
15. An electronic appliance using the display device as disclosed in claim 9 .
16. The display device according to claim 9 , further comprising a driver circuit portion including a third transistor,
wherein the driver circuit portion is provided between the plurality of pixels and the plurality of memory cells.