Display device
View Patent ↗In an active matrix display device using an SRAM, the number of transistors configuring the SRAM circuit is large. Therefore, the transistors cannot be embedded in a pixel when a pixel area is small, otherwise an aperture ratio is reduced. In view of the foregoing, it is an object of the present invention to provide a display device without a refreshing operation and thus with small power consumption. According to the invention, a display device including a pixel which comprises a switching element and a nonvolatile memory element is provided. When a still image is displayed by utilizing a ferroelectric element as a nonvolatile memory element and storing a signal, writing is not required per frame. Further, as the ferroelectric element occupies a small area, a memory circuit can be incorporated without decreasing an aperture ratio.
1. A display device comprising:
a source signal line;
a gate signal line;
a common electrode; and
a pixel comprising:
a switching element;
a nonvolatile memory element; and
a pixel electrode,
wherein:
an input terminal of the switching element is electrically connected to the source signal line;
an output terminal of the switching element is electrically connected to the pixel electrode;
the nonvolatile memory element is electrically connected between the pixel electrode and the common electrode; and
a control terminal of the switching element is electrically connected to the gate signal line.
2. A display device comprising:
a source signal line;
a gate signal line;
a common electrode; and
a pixel comprising a plurality of sub-pixels, each of the sub-pixels comprising:
a switching element;
a nonvolatile memory element; and
a pixel electrode,
wherein:
an input terminal of the switching element is electrically connected to the source signal line;
an output terminal of the switching element is electrically connected to the pixel electrode;
the nonvolatile memory element is electrically connected between the pixel electrode and the common electrode; and
a control terminal of the switching element is electrically connected to the gate signal line.
3. A display device comprising:
a plurality of source signal lines;
a gate signal line;
a common electrode; and
a pixel comprising a plurality of sub-pixels, each of the
sub-pixels comprising:
a switching element;
a nonvolatile memory element; and
a pixel electrode,
wherein:
an input terminal of the switching element is electrically connected to corresponding one of the plurality of source signal lines;
an output terminal of the switching element is electrically connected to the pixel electrode;
the nonvolatile memory element is electrically connected between the pixel electrode and the common electrode;
a control terminal of the switching element is electrically connected to the gate signal line; and
each switching element in the pixel is electrically connected to different one of the plurality of source signal lines.
4. A display device comprising:
n lines of source signal lines;
a gate signal line;
a common electrode; and
a pixel comprising n sub-pixels, each of the sub-pixels comprising:
a switching element;
a nonvolatile memory element; and
a pixel electrode,
wherein:
n lines of the source signal lines are corresponding to one pixel column;
an input terminal of the switching element is electrically connected to corresponding one of the n lines of source signal lines;
an output terminal of the switching element is electrically connected to the pixel electrode;
the nonvolatile memory element is electrically connected between the pixel electrode and the common electrode;
a control terminal of the switching element is electrically connected to the gate signal line; and
each switching element in the pixel is electrically connected to corresponding one of the n lines of the source signal lines.
5. A display device comprising:
a source signal line;
a plurality of gate signal lines;
a common electrode; and
a pixel comprising a plurality of sub-pixels, each of the sub-pixel comprising:
a switching element;
a nonvolatile memory element; and
a pixel electrode,
wherein:
an input terminal of the switching element is electrically connected to the source signal line;
an output terminal of the switching element is electrically connected to the pixel electrode;
the nonvolatile memory element is electrically connected between the pixel electrode and the common electrode;
a control terminal of the switching element is electrically connected to corresponding one of the plurality of gate signal lines; and
each switching element in the pixel is electrically connected to different one of the plurality of gate signal lines.
6. A display device comprising:
a source signal line;
n lines of gate signal lines;
a common electrode; and
a pixel comprising n sub-pixels, each sub-pixels comprising:
a switching element;
a nonvolatile memory element; and
a pixel electrode,
wherein:
n lines of the gate signal lines are corresponding to one pixel row;
an input terminal of the switching element is electrically connected to the source signal line;
an output terminal of the switching element is electrically connected to the pixel electrode;
the nonvolatile memory element is electrically connected between the pixel electrode and the common electrode;
a control terminal of the switching element is electrically connected to corresponding one of the n lines of gate signal lines; and
each switching element in the pixel is electrically connected to corresponding one of the n lines of the gate signal lines.
7. A display device comprising:
a source signal line;
a gate signal line;
a common electrode; and
a pixel comprising:
a switching element;
a nonvolatile memory element;
a driver element; and
a pixel electrode,
wherein:
an input terminal of the switching element is electrically connected to the source signal line;
an output terminal of the switching element is electrically connected to the driver element;
the nonvolatile memory element is electrically connected between the pixel electrode and the common electrode;
a control terminal of the switching element is electrically connected to the gate signal line; and
the driver element is electrically connected to the pixel electrode.
8. A display device comprising:
a source signal line;
a gate signal line;
a common electrode; and
a pixel comprising a plurality of sub-pixels, each of the sub-pixels comprising:
a switching element;
a nonvolatile memory element; and
a driver element; and a pixel electrode,
wherein:
an input terminal of the switching element is electrically connected to the source signal line,
an output terminal of the switching element is electrically connected to the driver element;
the nonvolatile memory element is electrically connected between the pixel electrode and the common electrode;
a control terminal of the switching element is electrically connected to the gate signal line; and
the driver element is electrically connected to the pixel electrode.
9. A display device comprising:
a plurality of source signal lines;
a gate signal line;
a common electrode; and
a pixel comprising a plurality of sub-pixels, each of the sub-pixels comprising:
a switching element
a nonvolatile memory element;
a driver element; and
a pixel electrode,
wherein:
an input terminal of the switching element is electrically connected to corresponding one of the plurality of source signal lines;
an output terminal of the switching element is electrically connected to the driver element;
the nonvolatile memory element is electrically connected between the pixel electrode and the common electrode;
a control terminal of the switching element is electrically connected to the gate signal line;
the driver element is electrically connected to the pixel electrode; and
each switching element in the pixel is electrically connected to different one of the plurality of source signal lines.
10. A display device comprising:
n lines of source signal lines;
a gate signal line;
a common electrode; and
a pixel comprising n sub-pixels, each of the sub-pixels
comprising:
a switching element;
a nonvolatile memory element;
a driver element; and
a pixel electrode;
wherein:
n lines of the source signal lines are corresponding to one pixel column
an input terminal of the switching element is electrically connected to corresponding one of the n lines of source signal lines;
an output terminal of the switching element is electrically connected to the driver element;
the nonvolatile memory element is electrically connected between the pixel electrode and the common electrode;
a control terminal of the switching element is electrically connected to the gate signal line;
the driver element is electrically connected to the pixel electrode; and
each switching element in the pixel is electrically connected to corresponding one of the n lines of the gate signal lines.
11. A display device comprising:
a source signal line;
a plurality of gate signal lines;
a common electrode; and
a pixel comprising a plurality of sub-pixels, each of the sub-pixels comprising:
a switching element;
a nonvolatile memory element;
a driver element; and
a pixel electrode,
wherein:
an input terminal of the switching element is electrically connected to the source signal line;
an output terminal of the switching element is electrically connected to the driver element;
the nonvolatile memory element is electrically connected between the pixel electrode and the common electrode;
a control terminal of the switching element is electrically connected to corresponding one of the plurality of gate signal lines;
the driver element is electrically connected to the pixel electrode; and
each switching element in the pixel is electrically connected to different one of the plurality of gate signal lines.
12. A display device comprising:
a source signal line;
n lines of gate signal lines;
a common electrode; and
a pixel comprising n sub-pixels, each of the sub-pixels comprising:
a switching element;
a nonvolatile memory element; a driver element; and
a pixel electrode,
wherein:
n lines of the gate signal lines are corresponding to one pixel row;
an input terminal of the switching element is electrically connected to the source signal line;
an output terminal of the switching element is electrically connected to driver element;
the nonvolatile memory element is electrically connected between the pixel electrode and the common electrode;
a control terminal of the switching element is electrically connected to corresponding one of the n lines of gate signal lines;
the driver element is electrically connected to the pixel electrode; and
each switching element in the pixel is electrically connected to any one of the n lines of the gate signal lines.
13. A display device according to any one of claims 1 to 12 , wherein a ferroelectric memory is utilized as the nonvolatile memory element.
14. A display device according to any one of claims 1 to 12 , wherein a thin film transistor is utilized as the switching element.
15. A display device according to any one of claims 1 to 12 , wherein the source signal line driver circuit is formed on the same substrate as the pixel.
16. A display device according to claim 15 , wherein the source signal line driver circuit or the gate signal line driver circuit is configured with unipolar transistors.
17. A display device according to any one of claims 1 to 12 , wherein the gate signal line driver circuit is formed on the same substrate as the pixel.
18. A display device according to claim 17 , wherein the source signal line driver circuit or the gate signal line driver circuit is configured with unipolar transistors.
19. Electric apparatuses, wherein the display device as set forth in any one of claims 1 to 12 is applied.
20. A display device comprising:
a source signal line;
a gate signal line; and
a pixel comprising:
a first switching element;
a second switching element;
a capacitor element;
a nonvolatile memory element; and
a pixel electrode,
wherein:
an input terminal of the first switching element is electrically connected to the source signal line;
an output terminal of the first switching element is electrically connected to an input terminal of the second switching element and the pixel electrode;
a control terminal of the first switching element is electrically connected to the gate signal line;
the second switching element is selectively connected to one of the capacitor element and the nonvolatile memory element.