Pixel Circuit, Organic Electroluminescent Display Panel and Display Apparatus

Patent metadata

Field	Value
Publication number	US-2016266702-A1
Application number	US-201414758066-A
Country	US
Kind code	A1
Filing date	Sep 26, 2014
Priority date	Jun 30, 2014
Publication date	Sep 15, 2016
Grant date	—

Abstract

The present disclosure discloses a pixel circuit, an organic electroluminescent display panel and a display apparatus, and during a reset phase, under a control of a reset signal terminal (Rst), a touch detection unit and a light emitting control unit in the pixel circuit are reset respectively; during a touch read phase, under a control of a scanning signal terminal (Scan), the touch detection unit outputs a touch detection signal to a touch signal read terminal (Read), so as to implement a touch detection function, meanwhile the light emitting control unit is charged; and during a light emitting phase, under a control of a light emitting signal terminal (Em), the light emitting control unit drives a light emitting device to emit light, so as to implement a display driving function.

First claim

1 . A pixel circuit, comprising: a touch detection unit, a light emitting device and a light emitting control unit; wherein,
a first input terminal of the touch detection unit is connected with a data signal terminal, a second input terminal of the touch detection unit is connected with a touch signal input terminal, a first control terminal of the touch detection unit is connected with a reset signal terminal, a second control terminal of the touch detection unit is connected with a scanning signal terminal, and an output terminal of the touch detection unit is connected with a touch signal read terminal; a first input terminal of the light emitting control unit is connected with the data signal terminal, a second input terminal of the light emitting control unit is connected with a high level signal terminal, a third input terminal of the light emitting control unit is connected with a reference signal terminal, a first control terminal of the light emitting control unit is connected with the reset signal terminal, a second control terminal of the light emitting control unit is connected with the scanning signal terminal, a third control terminal of the light emitting control unit is connected with a light emitting signal terminal, and an output terminal of the light emitting control unit is connected with the light emitting device; during a reset phase, under a control of the reset signal terminal, the touch detection unit and the light emitting control unit are reset respectively; during a touch read phase, under a control of the scanning signal terminal, the touch detection unit outputs a touch detection signal to the touch signal read terminal, meanwhile the light emitting control unit is charged; and during a light emitting phase, under a control of the light emitting signal terminal, the light emitting control unit drives the light emitting device to emit light.

2 . The pixel circuit as claimed in claim 1 , wherein the light emitting control unit comprises: a light emitting control module, a light emitting driving module, a light emitting reset module, and a light emitting charging module; wherein,
an input terminal of the light emitting control unit, which functions as the third input terminal of the light emitting control unit, is connected with the reference signal terminal, a control terminal of the light emitting reset module, which functions as the first control terminal of the light emitting control unit, is connected with the reset signal terminal, and an output terminal of the light emitting reset module is connected with a control terminal of the light emitting driving module; an input terminal of the light emitting charging module, which functions as the input terminal of the light emitting control unit, is connected with the data signal terminal, a control terminal of the light emitting charging module, which functions as the second control terminal of the light emitting control unit, is connected with the scanning signal terminal, and an output terminal of the light emitting charging module is connected with a first input terminal of the light emitting driving module; a second input terminal of the light emitting driving module, which functions as the second input terminal of the light emitting control unit, is connected with the high level signal terminal; an input terminal of the light emitting control module is connected with an output terminal of the light emitting driving module; a control terminal of the light emitting control module, which functions as the third control terminal of the light emitting control unit, is connected with the light emitting signal terminal, and an output terminal of the light emitting control module, which functions as the output terminal of the light emitting control unit, is connected with the light emitting device; during the reset phase, under the control of the reset signal terminal, the light emitting reset module resets the light emitting driving module; during the touch read phase, under the control of the scanning signal terminal, the light emitting charging module charges the light emitting driving module; and during the light emitting phase, under the control of the light emitting signal terminal, the light emitting control module controls the light emitting driving module to drive the light emitting device to emit light.

3 . The pixel circuit as claimed in claim 2 , wherein the light emitting driving module comprises: a first drive transistor and a second drive transistor which are set in mirror image, and a memory capacitor; wherein,
a source of the first drive transistor is connected with the output terminal of the light emitting charging module; a drain of the first drive transistor, a gate of the first drive transistor, a gate of the second drive transistor are connected with the output terminal of the light emitting reset module respectively; a source of the second drive transistor is connected with the high level signal terminal, and a drain of the second drive transistor is connected with the input terminal of the light emitting control module; when both the first drive transistor and the second drive transistor are P type transistors, the reference signal terminal is a low level signal terminal, and the memory capacitor is connected between the gate and the source of the second drive transistor; and when both the first drive transistor and the second drive transistor are N type transistor, the reference signal terminal is the high level signal terminal, and the memory capacitor is connected between the gate and drain of the second drive transistor.

4 . The pixel circuit as claimed in claim 2 , wherein the light emitting reset module comprises: a first switch transistor; wherein,
a source of the first switch transistor is connected with the reference signal terminal, a gate of the first switch transistor is connected with the reset signal terminal, and a drain of the first switch transistor is the output terminal of the light emitting reset module.

5 . The pixel circuit as claimed in claim 2 , wherein the light emitting charging module comprises: a second switch transistor; wherein,
a source of the second switch transistor is connected with the data signal terminal, a gate of the second switch transistor is connected with the scanning signal terminal, and a drain of the second switch transistor is connected with the source of the first drive transistor.

6 . The pixel circuit as claimed in claim 3 , wherein the light emitting control module comprises: a third switch transistor; wherein,
a gate of the third switch transistor is connected with the light emitting signal terminal, a source of the third switch transistor is connected with the drain of the second drive transistor, and a drain of the third switch transistor is connected with the light emitting device.

7 . The pixel circuit as claimed in claim 1 , wherein, the touch detection unit comprises: a touch sensing module, a touch reset module, and a touch control module; wherein,
an input terminal of the touch sensing module, which functions as the second input terminal of the touch detection unit, is connected with the touch signal input terminal, a control terminal of the touch sensing module is connected with an output terminal of the touch reset module, and an output terminal of the touch sensing module is connected with an input terminal of the touch control module; an input terminal of the touch reset module, which functions as the first input terminal of the touch detection unit, is connected with the data signal terminal, a control terminal of the touch reset module, which functions as the first control terminal of the touch detection unit, is connected with the reset signal terminal; a control terminal of the touch control module, which fun

Assignees

• Boe Technology Group Co Ltd
• Beijing Boe Optoelectronics Tech Co Ltd

Inventors

• Yang Shengji
• Dong Xue
• Wang Haisheng
• Liu Yingming
• Ding Xiaoliang
• Zhao Weijie
• Wang Lei
• Wang Chunlei
• Xie Xiaobo
• Li Wei
• You Yang
• Cui Ziwei
• Xu Rui

Classifications

• G09G3/2092

  Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto (suitable for both CRT and flat panel G09G5/003; specific for a CRT G09G1/165) · CPC title

• G06F3/0416 Primary

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06F3/04184

  Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally · CPC title

• G06F3/04166

  Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving (Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184) · CPC title

• G06F3/0412 Primary

  Digitisers structurally integrated in a display · CPC title