Pixel circuit, its driving methods, organic light-emitting diode display panel, and display device

Patent metadata

Field	Value
Publication number	US-2016246409-A1
Application number	US-201414650801-A
Country	US
Kind code	A1
Filing date	Aug 25, 2014
Priority date	Jun 27, 2014
Publication date	Aug 25, 2016
Grant date	—

Abstract

The present disclosure provides a pixel circuit, its driving methods, an OLED display panel and a display device. The pixel circuit includes a driving controlling unit configured to, under the control of a first scanning signal and a second scanning signal, charge or discharge a first storage capacitor through a first level, a second level and a data voltage, so as to compensate for a threshold voltage of a driving transistor with a gate-to-source voltage of the driving transistor when an OLED is driven by the driving transistor to emit light; and a touch controlling unit including a touch sensor and configured to, under the control of the first scanning signal and the second scanning signal, sense by the touch sensor whether or not a touch is made and transmit a corresponding touch sensing signal to a touch signal reading line.

First claim

What is claimed is:

1 . A pixel circuit, comprising a driving transistor, a first storage capacitor, and an organic light-emitting diode (OLED), a gate electrode of the driving transistor being connected to a first end of the first storage capacitor, a first electrode of the driving transistor being connected to an anode of the OLED, and a cathode of the OLED being configured to receive a first level, the pixel circuit further comprising:
a driving controlling unit connected to the first end of the first storage capacitor, a second end of the first storage capacitor, the first electrode of the driving transistor and a second electrode of the driving transistor, and configured to, under the control of a first scanning signal and a second scanning signal, charge or discharge the first storage capacitor through the first level, a second level and a data voltage, so as to compensate for a threshold voltage of the driving transistor with a gate-to-source voltage of the driving transistor when the OLED is driven by the driving transistor to emit light; and a touch controlling unit connected to the second end of the first storage capacitor and a touch signal reading line, and including a touch sensor and configured to, under the control of the first scanning signal and the second scanning signal, sense by the touch sensor whether or not a touch is made and transmit a corresponding touch sensing signal to the touch signal reading line.

2 . The pixel circuit according to claim 1 , wherein the driving controlling unit comprises:
a first driving controlling transistor, a gate electrode of which is configured to receive the second scanning signal, a first electrode of which is connected to the second electrode of the driving transistor, and a second electrode of which is configured to receive the second level; a second driving controlling transistor, a gate electrode of which is configured to receive the first scanning signal, a first electrode of which is connected to the first end of the first storage capacitor, and a second electrode of which is connected to the second electrode of the driving transistor; a third driving controlling transistor, a gate electrode of which is configured to receive a control signal, a first electrode of which is connected to the second end of the first storage capacitor, and a second electrode of which is connected to the data voltage, the control signal being of a phase inverted to that of the second scanning signal; and a fourth driving controlling transistor, a gate electrode of which is configured to receive the first scanning signal, a first electrode of which is configured to receive the first level, and a second electrode of which is connected to the first electrode of the driving transistor, wherein the first driving controlling transistor is of a type identical to the third driving controlling transistor, and the second driving controlling transistor is of a type identical to the fourth driving controlling transistor.

3 . The pixel circuit according to claim 1 , wherein the driving controlling unit comprises:
a first driving controlling transistor, a gate electrode of which is configured to receive the second scanning signal, a first electrode of which is connected to the second electrode of the driving transistor, and a second electrode of which is configured to receive the second level; a second driving controlling transistor, a gate electrode of which is configured to receive the first scanning signal, a first electrode of which is connected to the first end of the first storage capacitor, and a second electrode of which is connected to the second electrode of the driving transistor; a third driving controlling transistor, a gate electrode of which is connected to the second scanning signal, a first electrode of which is connected to the second end of the first storage capacitor, and a second electrode of which is configured to receive the data voltage; and a fourth driving controlling transistor, a gate electrode of which is configured to receive the first scanning signal, a first electrode of which is configured to receive the first level, and a second electrode of which is connected to the first electrode of the driving transistor, wherein the first driving controlling transistor is of a type different from the third driving controlling transistor, and the second driving controlling transistor is of a type identical to the fourth driving controlling transistor.

4 . The pixel circuit according to claim 1 , wherein the touch sensor comprises a touch electrode, and the touch controlling unit is configured to convert a potential of the touch electrode into the touch sensing signal, and transmit the touch sensing signal to the touch signal reading line.

5 . The pixel circuit according to claim 4 , wherein the touch controlling unit comprises:
a second storage capacitor; a first touch controlling transistor, a gate electrode of which is configured to receive the first scanning signal, a first electrode of which is connected to a touch electrode end of the second storage capacitor, and a second electrode of which is connected to the second end of the first storage capacitor; a second touch controlling transistor, a gate electrode of which is connected to the touch electrode end of the second storage capacitor, and a first electrode of which is configured to receive a third level; and a third touch controlling transistor, a gate electrode of which is configured to receive the second scanning signal, a first electrode of which is connected to a second electrode of the second touch controlling transistor, and a second electrode of which is connected to the touch signal reading line, wherein the other end of the second storage capacitor is configured to receive the third level, and the third touch controlling transistor is of a type identical to the first driving controlling transistor, and the first touch controlling transistor is of a type identical to the second driving controlling transistor.

6 . The pixel circuit according to claim 1 , wherein the touch sensor comprises a photosensitive transistor, and the touch controlling unit is configured to convert a photocurrent signal generated by the photosensitive transistor into the touch sensing signal, and transmit the touch sensing signal to the touch signal reading line.

7 . The pixel circuit according to claim 6 , wherein the touch controlling unit comprises:
a first touch controlling transistor, a gate electrode of which is configured to receive the first scanning signal, a first electrode of which is configured to receive the data voltage, and a second electrode of which is connected to a first electrode of the photosensitive transistor; a second touch controlling transistor, a gate electrode of which is configured to receive the second scanning signal, a first electrode of which is connected to a second electrode of the photosensitive transistor, and a second electrode of which is connected to the touch signal reading line; and a second storage capacitor, a first electrode of which is connected to a gate electrode of the photosensitive transistor, and a second electrode of which is connected to the second electrode of the photosensitive transistor, wherein the gate electrode of the photosensitive transistor is connected to the first electrode of the photosensitive transistor, and the second touch controlling transistor is of a type identical to the first driving controlling transistor, and the first touch controlling transistor is of a type identical to the second driving controlling transistor.

8 . A method for driving the pixel circuit according to claim 1 , comprising:
a display driving step: within a time period, under the control of a fir

Assignees

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

Inventors

• Yang Shengji

Classifications

• G09G3/3225

  using an active matrix · CPC title

• G06F3/0416

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06F3/044 Primary

  by capacitive means · CPC title

• G06F3/04184 Primary

  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