Granted Patent B2

US 9,640,101 · App. 14/626,232 · Granted May 2, 2017

Abstract

Claims (40)

1. A display apparatus, comprising:

a display panel where display elements connected to a scanning line and a signal line are arrayed in a two dimensional matrix, and

a driving circuit unit configured to drive the display panel, the driving circuit unit including a gate driver configured to feed a scanning signal to the scanning line such that a back gate voltage of a field effect transistor configuring an output buffer for generating the scanning signal is controllable, wherein

the output buffer includes a first transistor and a second transistor,

a source/drain region of the first transistor is connected to a source/drain region of the second transistor,

a first voltage is applied to another source/drain region of the first transistor,

a second voltage is applied to another source/drain region of the second transistor,

a back gate voltage of the first transistor and a back gate voltage of the second transistor are controllable based on temperature information of the gate driver.

2. The display apparatus according to claim 1 , wherein

the back gate voltage of the first transistor and the back gate voltage of the second transistor are independently controllable.

3. The display apparatus according to claim 1 , wherein

the back gate voltage of the first transistor and the back gate voltage of the second transistor are controllable based on the temperature information of the gate driver and temperature information of the display panel.

4. The display apparatus according to claim 1 , wherein

the first transistor and the second transistor are configured of transistors having different conductive types.

5. The display apparatus according to claim 1 , wherein

the first transistor and the second transistor are configured of transistors having a same conductive type.

6. An electronic device, comprising:

the display apparatus according to claim 1 .

7. A display apparatus, comprising:

display elements arrayed in a two dimensional matrix, a scanning line is electrically connected to a gate electrode for one of the display elements;

an output buffer circuitry configured to output a scanning signal to the scanning line, the output buffer includes a first transistor and a second transistor;

voltage control circuitry configured to output a first back gate voltage to a back gate of the first transistor and a second back gate voltage to a back gate of the second transistor, a gate electrode for the first transistor is electrically connected to a gate electrode for the second transistor,

wherein a source/drain region for the first transistor and a source/drain region for the second transistor are electrically connected to the scanning line, the source/drain region for the first transistor is electrically connected to the source/drain region for the second transistor,

wherein the display elements are in a display panel, the display panel includes a display panel temperature sensor that is configured to detect a temperature of the display panel,

wherein the voltage control circuitry is configured to adjust the first back gate voltage from a voltage to another voltage when the display panel temperature sensor detects a change in the temperature of the display panel.

8. The display apparatus according to claim 7 , wherein the voltage control circuitry is configured to adjust a voltage level of the first back gate voltage.

9. A display apparatus, comprising:

display elements arrayed in a two dimensional matrix, a scanning line is electrically connected to a gate electrode for one of the display elements;

an output buffer circuitry configured to output a scanning signal to the scanning line, the output buffer includes a first transistor and a second transistor;

voltage control circuitry configured to output a first back gate voltage to a back gate of the first transistor and a second back gate voltage to a back gate of the second transistor, a gate electrode for the first transistor is electrically connected to a gate electrode for the second transistor,

wherein a source/drain region for the first transistor and a source/drain region for the second transistor are electrically connected to the scanning line, the source/drain region for the first transistor is electrically connected to the source/drain region for the second transistor,

wherein the display elements are in a display panel, the display panel includes a display panel temperature sensor that is configured to detect a temperature of the display panel,

wherein the voltage control circuitry is configured to adjust the first back gate voltage from a first voltage level to a second voltage level when the gate driver temperature sensor detects a change in the temperature of the gate driver.

10. The display apparatus according to claim 7 , wherein another source/drain region for the first transistor is configured to receive a first voltage and another source/drain region for the second transistor is configured to receive a second voltage that differs from the first voltage.

11. The display apparatus according to claim 7 , wherein a signal line is electrically connected to a source/drain region for said one of the display elements.

12. The display apparatus according to claim 7 , wherein the first transistor and the second transistor are of a same conductivity type.

13. The display apparatus according to claim 7 , wherein a conductivity type of the first transistor differs from a conductivity type of the second transistor.

14. The display apparatus according to claim 13 , wherein the conductivity type of the first transistor is opposite to the conductivity type of the second transistor.

15. An electronic device, comprising:

the display apparatus according to claim 7 .

Assignments (6)