Display device and method of driving the same
For example, a display element ( 1 ) formed by an organic EL element and a control element formed by a MOS transistor ( 2 ) are connected in series between a driving line ( 6 ) to be driven with a voltage or a current and a ground. A gate of the MOS transistor ( 2 ) is connected to a control line ( 7 ) through a nonvolatile data holding section such as a ferroelectric capacitor ( 3 ), and control data of the MOS transistor ( 2 ) can be held in a floating state. As a result, the ON/OFF data of each pixel are held in the floating state, and display data are rewritten to only a pixel to be changed in a display state of ON/OFF or the like and held data are displayed on a pixel which is not changed in the display data. Consequently, it is possible to obtain a nonvolatile display device capable of reducing power consumption and operating with a small battery.
1. A display device, comprising:
a display element;
an MFMIS structure transistor which has a first metal layer, a ferroelectric layer, a second metal layer for gate electrode and an insulator layer provided on a semiconductor layer, a source and drain of said MFMIS structure transistor being connected to said display element and a driving line and said first metal layer being connected to a control line; and
a capacitor connected between said second metal layer and a ground or a write line,
wherein the control data is written to said MFMIS structure transistor by using said control line and said ground or said write line, and
wherein the MFMIS structure transistor maintains a floating state while the control data is written thereto.
2. The display device of claim 1 , wherein a selective transistor is connected between a nonvolatile data holding section and said control line, and a gate of said selective transistor is connected to a selective line.
3. The display device of claim 1 , wherein said display element is formed by an organic EL element.
4. A display device, comprising:
a display element;
a MOS transistor, a source and drain of said MOS transistor being connected to said display element and a driving line;
a ferroelectric capacitor connected between a gate of said MOS transistor and a control line; and
a capacitor connected between said gate and a ground or a write line,
wherein the control data is written to said ferroelectric capacitor by using said control line and said ground or said write line, and
wherein said ferroelectric capacitor maintains a floating state while the control data is written thereto.
5. The display device of claim 4 , wherein a selective transistor is connected between said ferroelectric capacitor and said control line, and a gate of said selective transistor is connected to a selective line.
6. The display device of claim 4 , wherein said display element is formed by an organic EL element.
7. A display device, comprising:
a display element;
a control element for controlling a voltage or a current to be applied to said display element to drive said display element; and
a nonvolatile data holding section integrated with said control element or connected to said control element and capable of holding control data of said control element in a floating state;
wherein said nonvolatile data holding section is constituted by an element utilizing a magnetoresistance effect or a single electron memory having electrons stored in quatum dot over a barrier region.
8. The display device of claim 7 , wherein said display element is formed by an organic EL element.