초록 ▼

In a conventional display device comprising a sub-display, the display device is increased in thickness and in the number of components as the number of displays is increased. In the present invention, a dual emission display device is used so that either surface of a display is used as a main displ

In a conventional display device comprising a sub-display, the display device is increased in thickness and in the number of components as the number of displays is increased. In the present invention, a dual emission display device is used so that either surface of a display is used as a main display or a sub-display. Accordingly, the display device can be reduced in thickness and in the number of components. Further, mechanical reliability can be enhanced when the invention is applied to a tablet PC, a video camera and the like.

대표청구항 ▼

What is claimed is: 1. A display device comprising: light emitting elements formed over one surface of a light transmissive substrate; transistors formed over the light transmissive substrate; a first display surface over one surface of the light transmissive substrate; and a second display surface

What is claimed is: 1. A display device comprising: light emitting elements formed over one surface of a light transmissive substrate; transistors formed over the light transmissive substrate; a first display surface over one surface of the light transmissive substrate; and a second display surface over the other surface of the light transmissive substrate, wherein at least one the light emitting elements includes a first electrode connected to the transistor, a second electrode and a light emitting layer interposed between the first electrode and the second electrode, wherein the first electrode and the second electrode are light transmissive electrodes and the light emitting element is arranged such that light passes through the first electrode to the first display surface and light passes through the second electrode to the second display surface, wherein an image is displayed on a first display screen formed on the first display surface and a second display screen formed on the second display surface using a light from the light emitting elements, and wherein the first display screen is larger than the second display screen. 2. The display device according to claim 1, wherein the light emitting elements emit white light, and a color filter is provided over the light transmissive substrate. 3. The display device according to claim 1, wherein the light emitting elements emit different colored lights. 4. The display device according to claim 1, wherein a scan direction of the first display screen is different from a scan direction of the second display screen. 5. The display device according to claim 4, wherein the first display screen and the second display screen comprise a signal line driver circuit in common, and the signal line driver circuit comprises switching means for changing the scan direction of thc first display screen and the scan direction of the second display screen. 6. The display device according to claim 4, wherein the display device comprises a volatile storage and a switching means for changing the reading order of data stored in the volatile storage. 7. The display device according to claim 1, wherein the first display surface and the second display surface are sandwiched by two polarizers having different polarization directions. 8. The display device according to claim 7, wherein a crossing angle of the polarization directions of the two polarizers is in the range of 45 to 90 degrees. 9. The display device according to claim 1, wherein the display device comprises a signal line driver circuit which is capable of arbitrarily selecting a signal line from a plurality of signal lines extending on the first display screen and the second display screen, and capable of outputting an image signal to the signal line. 10. The display device according to claim 1, wherein a photoelectric converter is provided on at least one of the first display screen and the second display screen. 11. An electronic apparatus comprising: a light emitting element formed over one surface of a light transmissive substrate; a transistor formed over the light transmissive substrate; and display means for emitting light from the light emitting element to the light transmissive substrate side and the opposite side thereof so as to form a first display surface and a second display surface, wherein at least one of the light emitting elements includes a first electrode connected to the transistor, a second electrode and a light emitting layer interposed between the first electrode and the second electrode, wherein the first electrode and the second electrode are light transmissive electrodes and the light emitting element is arranged such that the light passes through the first electrode to the first display surface and light passes through the second electrode to the second display surface, and wherein a first display screen formed on the first display surface is larger than a second display screen formed on the second display surface. 12. The electronic apparatus according to claim 11, wherein the electronic apparatus is a personal computer. 13. The electronic apparatus according to claim 11, wherein the electronic apparatus is a video camera. 14. The electronic apparatus according to claim 11, wherein the electronic apparatus is a digital camera. 15. The electronic apparatus according to claim 11, wherein the electronic apparatus is a portable communication tool. 16. The electronic apparatus according to claim 11, wherein the electronic apparatus comprises an electrical storage, and light emission control means for lighting the first display screen and the second display screen when the electrical storage is charged. 17. The electronic apparatus according to claim 16, wherein the light emission control means comprises a recording medium on which is recorded a control program for lighting the first display screen and the second display screen. 18. The electronic apparatus according to claim 16, wherein the light emission control means comprises a recording medium on which is recorded a control program for lighting an inverted display screen whose contrast is inverted from that of a normal display screen. 19. The electronic apparatus according to claim 16, wherein the light emission control means comprises a recording medium on which is recorded a control program for lighting a pixel which is less in deterioration.