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

Patent metadata

Field	Value
Publication number	US-9727186-B2
Application number	US-201414650801-A
Country	US
Kind code	B2
Filing date	Aug 25, 2014
Priority date	Jun 27, 2014
Publication date	Aug 8, 2017
Grant date	Aug 8, 2017

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;
an organic light-emitting diode (OLED),
wherein a gate electrode of the driving transistor is connected to a first end of the first storage capacitor,
wherein a first electrode of the driving transistor is connected to an anode of the OLED, and
wherein a cathode of the OLED is configured to receive a first voltage;
a driving controlling circuit 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, wherein the driving controlling circuit is configured to, based on a first scanning signal and a second scanning signal, charge or discharge the first storage capacitor based on the first voltage, a second voltage and a data voltage 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 circuit directly connected to the second end of the first storage capacitor and a touch signal reading line, wherein the touch controlling circuit includes a touch sensor and is configured to, based on the first scanning signal and the second scanning signal, sense via the touch sensor whether or not a touch has been detected by the touch sensor 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 circuit comprises:
a first driving controlling transistor comprising
a gate electrode configured to receive the second scanning signal,
a first electrode connected to the second electrode of the driving transistor, and
a second electrode configured to receive the second voltage;

a second driving controlling transistor comprising
a gate electrode configured to receive the first scanning signal,
a first electrode connected to the first end of the first storage capacitor, and
a second electrode connected to the second electrode of the driving transistor;

a third driving controlling transistor comprising
a gate electrode configured to receive a control signal,
a first electrode connected to the second end of the first storage capacitor, and
a second electrode 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 comprising
a gate electrode configured to receive the first scanning signal,
a first electrode configured to receive the first voltage, and
a second electrode 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
wherein the second driving controlling transistor is of a type identical to the fourth driving controlling transistor.

3. The pixel circuit according to claim 2 , wherein:
the touch sensor comprises a touch electrode; and
the touch controlling circuit 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.

4. The pixel circuit according to claim 2 , wherein:
the touch sensor comprises a photosensitive transistor; and
the touch controlling circuit is configured to convert a photocurrent signal generated by the photosensitive transistor to the touch sensing signal and transmit the touch sensing signal to the touch signal reading line.

5. The pixel circuit according to claim 1 , wherein the driving controlling circuit comprises:
a first driving controlling transistor comprising
a gate electrode configured to receive the second scanning signal,
a first electrode connected to the second electrode of the driving transistor, and
a second electrode configured to receive the second voltage;

a second driving controlling transistor comprising
a gate electrode configured to receive the first scanning signal,
a first electrode connected to the first end of the first storage capacitor, and
a second electrode connected to the second electrode of the driving transistor;

a third driving controlling transistor comprising
a gate electrode connected to the second scanning signal,
a first electrode connected to the second end of the first storage capacitor, and
a second electrode configured to receive the data voltage; and

a fourth driving controlling transistor comprising
a gate electrode configured to receive the first scanning signal,
a first electrode configured to receive the first voltage, and
a second electrode 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
wherein the second driving controlling transistor is of a type identical to the fourth driving controlling transistor.

6. The pixel circuit according to claim 5 , wherein;
the touch sensor comprises a touch electrode; and
the touch controlling circuit 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.

7. The pixel circuit according to claim 5 , wherein:
the touch sensor comprises a photosensitive transistor; and
the touch controlling unit circuit is configured to convert a photocurrent signal generated by the photosensitive transistor to the touch sensing signal and transmit the touch sensing signal to the touch signal reading line.

8. The pixel circuit according to claim 1 , wherein,
the touch sensor comprises a touch electrode, and
the touch controlling circuit 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.

9. The pixel circuit according to claim 8 , wherein the touch controlling circuit comprises:
a second storage capacitor;
a first touch controlling transistor comprising
a gate electrode configured to receive the first scanning signal,
a first electrode connected to a touch electrode end of the second storage capacitor, and
a second electrode connected to the second end of the first storage capacitor;

a second touch controlling transistor comprising
a gate electrode connected to the touch electrode end of the second storage capacitor, and
a first electrode configured to receive a third level; and

a third touch controlling transistor comprising
a gate electrode configured to receive the second scanning signal,
a first electrode connected to a second electrode of the second touch controlling transistor, and
a second electrode connected to the touch signal reading line,

wherein
another end of the second storage capacitor is configured to receive the third level,
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.

10. A method for driving the pixel circuit of claim 3 , the method comprising:
a display driving operation including
at a first stage of a time period and based on the first scanning signal and the second scanning signal, controlling, via the driving controlling circuit, charging of the first end of the first storage capacitor to the second voltage,
at a second stage of the time period and based on the first scanning signal and the second scanning signal,
controlling, via the driving controlling circuit, a po

Assignees

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

Inventors

• Yang Shengji

Classifications

• G09G2310/0251

  Precharge or discharge of pixel before applying new pixel voltage · CPC title

• G06F3/0412

  Digitisers structurally integrated in a display · CPC title

• G09G2300/0852

  being a dynamic memory with more than one capacitor · CPC title

• G09G3/3225

  using an active matrix · CPC title

• G09G2310/0262

  The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes · CPC title