Pixel circuit, organic electroluminescent display panel and display device

• US 9,495,908 B2
• Filed: 05/15/2014
• Issued: 11/15/2016
• Est. Priority Date: 07/31/2013
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd., Chengdu BOE Optoelectronics Technology Company Limited (BOE Technology Group Co., Ltd.)
• Original Assignee: BOE Technology Group Co., Ltd., Chengdu BOE Optoelectronics Technology Company Limited (BOE Technology Group Co., Ltd.)
• Inventors: Zhou, Quanguo, Qi, Xiaojing
• Primary Examiner(s): Boddie, William
• Assistant Examiner(s): ELNAFIA, SAIFELDIN E
• Application Number:
  US14/418,620
• Publication Number:
  US 20150325171A1
• Time in Patent Office: 915 Days
• US Class Current: 1/1
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04184 Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
• CPC Class Codes: G06F 3/042 by opto-electronic means
• CPC Class Codes: G09G 2300/0819 used for counteracting undesired variations, e.g. feedback or autozeroing
• CPC Class Codes: G09G 2300/0852 being a dynamic memory with more than one capacitor
• CPC Class Codes: G09G 2300/0861 with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
• CPC Class Codes: G09G 2354/00 Aspects of interface with display user
• CPC Class Codes: G09G 2360/144 the light being ambient light
• CPC Class Codes: G09G 3/32 semiconductive, e.g. using light-emitting diodes [LED]
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3291 in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements

Abstract

A pixel circuit, an organic electroluminescent display panel and a display device are provided. The pixel circuit includes a drive sub-module (1), a data write sub-module (2), a touch detection sub-module (3) having a photosensitive device and a light-emitting control sub-module (4) having a luminous device. Under the control of the reset signal terminal (Reset), the scan signal terminal (Scan) and the data signal terminal (Data), a data signal is transmitted to the first terminal (1a) of the drive sub-module (1) by the data write sub-module (2). Under the control of the touch control signal terminal (Select), the touch detection sub-module (3) controls output of a touch detection signal from the drive sub-module (1) to the touch signal read terminal, the touch detection signal being decreased as the light intensity irradiated onto the photosensitive device is increased, so as to realize a touch function. Under the control of the light-emitting control signal terminal (EM), the light-emitting control sub-module (4) controls the drive sub-module to drive the luminous device (1) to give off light, so as to realize a display function. Touch and display functions are integrated in the pixel circuit, so that the production cost involved in arranging a display driving circuit and a touch circuit separately can be saved.

Claims

1. A pixel circuit, comprising:

a drive sub-module, a data write sub-module, a touch detection sub-module having a photosensitive device, and a light-emitting control sub-module having a luminous device, wherein,

a first terminal of the drive sub-module is connected to a first terminal of the data write sub-module and a first terminal of the touch detection sub-module, respectively, a second terminal of the drive sub-module is connected to a second terminal of the data write sub-module, a second terminal of the touch detection sub-module and a first reference signal terminal, respectively, a third terminal of the drive sub-module is connected to a third terminal of the data write sub-module, a third terminal of the touch detection sub-module and a first terminal of the light-emitting control sub-module, respectively;

a fourth terminal of the data write sub-module is connected to a reset signal terminal, a fifth terminal of the data write sub-module is connected to a scan signal terminal, a sixth terminal of the data write sub-module is connected to a data signal terminal;

under the control of the reset signal terminal, the scan signal terminal and the data signal terminal, a data signal is transmitted to the first terminal of the drive sub-module by the data write sub-module;

a fourth terminal of the touch detection sub-module is connected to a touch control signal terminal, a fifth terminal of the touch detection sub-module is connected to a touch signal read terminal;

under the control of the touch control signal terminal, the touch detection sub-module controls output of a touch detection signal from the drive sub-module to the touch signal read terminal, the touch detection signal being decreased as the light intensity irradiated onto the photosensitive device is increased;

a second terminal of the light-emitting control sub-module is connected to a second reference signal terminal, a third terminal of the light-emitting control sub-module is connected to a light-emitting control signal terminal;

under the control of the light-emitting control signal terminal, the light-emitting control sub-module controls the drive sub-module to drive the luminous device to give off light,

wherein, the data write sub-module comprises a first switch transistor, a second switch transistor, a first capacitor and a second capacitor,

wherein, a gate electrode of the first switch transistor is connected to the reset signal terminal, a source electrode of the first switch transistor is connected to the third terminal of the drive sub-module, and a drain electrode of the first switch transistor is connected to the first terminal of the drive sub-module, a first end of the first capacitor and a first end of the second capacitor, respectively;

a gate electrode of the second switch transistor is connected to the scan signal terminal, a source electrode of the second switch transistor is connected to the data signal terminal, and a drain electrode of the second switch transistor is connected to a second end of the first capacitor;

a second end of the second capacitor is connected to the first reference signal terminal, the second terminal of the drive sub-module and the second terminal of the touch detection sub-module, respectively.

2. The pixel circuit according to claim 1, wherein, the first terminal and the second terminal of the drive sub-module are signal input terminals, and the third terminal of the drive sub-module is a signal output terminal;

the first terminal of the data write sub-module is a signal output terminal, the second terminal, the third terminal, the fourth terminal, the fifth terminal and the sixth terminal of the data write sub-module are signal input terminals;

one of the first terminal and the second terminal of the touch detection sub-module is a signal input terminal, the other one of the first terminal and the second terminal of the touch detection sub-module is a signal output terminal;

the third terminal and the fourth terminal of the touch detection sub-module are signal input terminals, the fifth terminal of the touch detection sub-module is a signal output terminal;

one of the first terminal and the second terminal of the light-emitting control sub-module is a signal input terminal, the other one of the first terminal and the second terminal of the light-emitting control sub-module is a signal output terminal;

the third terminal of the light-emitting control sub-module is a signal input terminal.

3. The pixel circuit according to claim 2, wherein, the drive sub-module comprises a drive transistor, a gate electrode of which is the first terminal of the drive sub-module, a source electrode of which is the second terminal of the drive sub-module, and a drain electrode of which is the third terminal of the drive sub-module.

4. The pixel circuit according to claim 3, wherein, the drive transistor is an N-type transistor, the voltage of the first reference signal terminal is a zero voltage or a negative voltage, and the voltage of the second reference signal terminal is a positive voltage;

or

the drive transistor is a P-type transistor, the voltage of the first reference signal terminal is a positive voltage, and the voltage of the second reference signal terminal is a negative voltage or a zero voltage.

5. The pixel circuit according to claim 2, wherein, the touch detection sub-module comprises a third switch transistor and a fourth switch transistor, wherein,

a gate electrode of the third switch transistor is connected to the touch control signal terminal, a drain electrode of the third switch transistor is connected to a first end of the photosensitive device;

one of a source electrode of the third switch transistor and a second terminal of the photosensitive device is connected to the first terminal of the drive sub-module, and the other one of the source electrode of the third switch transistor and the second terminal of the photosensitive device is connected to the first reference signal terminal;

a gate electrode of the fourth switch transistor is connected to the touch control signal terminal, a source electrode of the fourth switch transistor is connected to the third terminal of the drive sub-module, and a drain electrode of the fourth switch transistor is connected to the touch signal read terminal.

6. The pixel circuit according to claim 2, wherein, the light-emitting control sub-module comprises a fifth switch transistor, wherein,

a gate electrode of the fifth switch transistor is connected to the light-emitting control signal terminal, and a drain electrode of the fifth switch transistor is connected to a first terminal of the luminous device;

one of a source electrode of the fifth switch transistor and a second terminal of the luminous device is connected to the third terminal of the drive sub-module, and the other one of the source electrode of the fifth switch transistor and the second terminal of the luminous device is connected to the second reference signal terminal.

7. The pixel circuit according to claim 1, wherein, the first switch transistor is an N-type transistor or a P-type transistor;

the second switch transistor is an N-type transistor or a P-type transistor.

8. The pixel circuit according to claim 1, wherein, the touch detection sub-module comprises a third switch transistor and a fourth switch transistor, wherein,

a gate electrode of the third switch transistor is connected to the touch control signal terminal, a drain electrode of the third switch transistor is connected to a first end of the photosensitive device;

one of a source electrode of the third switch transistor and a second terminal of the photosensitive device is connected to the first terminal of the drive sub-module, and the other one of the source electrode of the third switch transistor and the second terminal of the photosensitive device is connected to the first reference signal terminal;

a gate electrode of the fourth switch transistor is connected to the touch control signal terminal, a source electrode of the fourth switch transistor is connected to the third terminal of the drive sub-module, and a drain electrode of the fourth switch transistor is connected to the touch signal read terminal.

9. The pixel circuit according to claim 8, wherein, the third switch transistor and the fourth switch transistor are N-type transistors;

or, the third switch transistor and the fourth switch transistor are P-type transistors.

10. The pixel circuit according to claim 1, wherein, the light-emitting control sub-module comprises a fifth switch transistor, wherein,

a gate electrode of the fifth switch transistor is connected to the light-emitting control signal terminal, and a drain electrode of the fifth switch transistor is connected to a first terminal of the luminous device;

one of a source electrode of the fifth switch transistor and a second terminal of the luminous device is connected to the third terminal of the drive sub-module, and the other one of the source electrode of the fifth switch transistor and the second terminal of the luminous device is connected to the second reference signal terminal.

11. The pixel circuit according to claim 10, wherein, the fifth switch transistor is an N-type transistor or a P-type transistor.

12. An organic electroluminescent display panel, comprising the pixel circuit according to claim 1.

13. A display device, comprising the organic electroluminescent display panel according to claim 12.

14. The organic electroluminescent display panel according to claim 12, wherein, the first terminal and the second terminal of the drive sub-module are signal input terminals, and the third terminal of the drive sub-module is a signal output terminal;

the first terminal of the data write sub-module is a signal output terminal, the second terminal, the third terminal, the fourth terminal, the fifth terminal and the sixth terminal of the data write sub-module are signal input terminals;

one of the first terminal and the second terminal of the touch detection sub-module is a signal input terminal, the other one of the first terminal and the second terminal of the touch detection sub-module is a signal output terminal;

the third terminal and the fourth terminal of the touch detection sub-module are signal input terminals, the fifth terminal of the touch detection sub-module is a signal output terminal;

one of the first terminal and the second terminal of the light-emitting control sub-module is a signal input terminal, the other one of the first terminal and the second terminal of the light-emitting control sub-module is a signal output terminal;

the third terminal of the light-emitting control sub-module is a signal input terminal.

15. The organic electroluminescent display panel according to claim 14, wherein, the drive sub-module comprises a drive transistor, a gate electrode of which is the first terminal of the drive sub-module, a source electrode of which is the second terminal of the drive sub-module, and a drain electrode of which is the third terminal of the drive sub-module.

16. The organic electroluminescent display panel according to claim 15, wherein, the drive transistor is an N-type transistor, the voltage of the first reference signal terminal is a zero voltage or a negative voltage, and the voltage of the second reference signal terminal is a positive voltage;

or

the drive transistor is a P-type transistor, the voltage of the first reference signal terminal is a positive voltage, and the voltage of the second reference signal terminal is a negative voltage or a zero voltage.

17. The organic electroluminescent display panel according to claim 12, wherein, the first switch transistor is an N-type transistor or a P-type transistor;

the second switch transistor is an N-type transistor or a P-type transistor.