Touch-control pixel-driving circuit and method thereof, a touch-control display apparatus

Patent metadata

Field	Value
Publication number	US-11106295-B2
Application number	US-201715777599-A
Country	US
Kind code	B2
Filing date	Sep 27, 2017
Priority date	May 12, 2017
Publication date	Aug 31, 2021
Grant date	Aug 31, 2021

Abstract

The present application discloses a touch-control pixel-driving circuit. The circuit includes a driving transistor coupled to a data line and a read line; an organic light-emitting diode (OLED) coupled to the driving transistor. The circuit also includes a light-sensing-touch sub-circuit coupled to the data line and the read line and configured to be reset by a first and a second control signals to send a raw signal flour the data line to the read line, and to generate a sensing signal depended on a change of the raw signal due to a touch and send the sensing signal to the read line. Further, the circuit includes a driving sub-circuit coupled to the driving transistor and configured to charge and discharge the driving transistor using a power-supply voltage and a data signal controlled by the first, the second, and a third control signals, and to drive the OLED for emitting light.

First claim

What is claimed is:

1. A touch-control pixel-driving circuit in a display apparatus, the circuit comprising:
a driving transistor;
an organic light-emitting diode (OLED) having a first electrode, and a second electrode coupled to a reference voltage terminal;
a light-sensing-touch sub-circuit coupled to a data line and a read line and configured to be reset by a first control signal and a second control signal to send a raw signal to the read line based on a high-level voltage at the data line, and to generate a sensing signal depended on a change of the raw signal due to a touch and send the sensing signal to the read line; and
a driving sub-circuit coupled to the driving transistor and configured to charge and discharge the driving transistor using a power-supply voltage from a power terminal and a data signal from the data line controlled by the first control signal, the second control signal and a third control signal, and to drive the OLED for emitting light;
wherein the driving transistor is electrically coupled to the data line and optically coupled through the light-sensing-touch sub-circuit to the read line; and
the first electrode is electrically coupled to the driving transistor and optically coupled through the light-sensing-touch sub-circuit to the read line;
wherein the light-sensing-touch sub-circuit comprises a photo transistor, a reset sub-subcircuit coupled to the photo transistor and the data line and configured to receive the first control signal, a transport sub-subcircuit coupled to the photo transistor and the read line and configured to receive the second control signal, and a storage sub-subcircuit coupled to the photo transistor for storing a current signal converted by the photo transistor sensing a light signal;
wherein the reset sub-subcircuit comprises a first transistor having a control terminal being provided with the first control signal, a first terminal coupled to the data line, and a second terminal coupled a control terminal and a second terminal of the photo transistor, wherein the first control signal is configured to provide a turn-on signal to make the first transistor in conduction state in a reset period to allow an initial data signal at a high voltage level from the data line as the raw signal to be passed to the photo transistor;
wherein the photo transistor is configured to generate a photocurrent signal upon being illuminated by an external light signal, the photocurrent signal being added to the raw signal as a change of the raw signal;
wherein the transport sub-subcircuit comprises a second transistor having a control terminal being provided with the second control signal, a first terminal coupled to a first terminal of the photo transistor, and a second terminal coupled to the read line, wherein the second control signal is configured to provide a turn-on signal to make the second transistor in conduction state to allow the either the raw signal or the change of the raw signal from the photo transistor to be passed to the read line.

2. The circuit of claim 1 , wherein the storage sub-subcircuit comprises a first capacitor having a first electrode coupled to a first terminal of the photo transistor and a second electrode coupled to a control terminal of the photo transistor.

3. The circuit of claim 1 , wherein the driving sub-circuit comprises a charger sub-subcircuit and a regulator sub-subcircuit, wherein the charger sub-subcircuit is configured to couple with the power terminal, the driving transistor, and the reference voltage terminal, and is configured to receive the first control signal and the second control signal to control charging or discharging of the driving transistor by the power-supply voltage from the power terminal, wherein the regulator sub-subcircuit is configured to couple with the data line and the driving transistor, and configured to receive the third control signal to regulate a voltage level at a control terminal of the driving transistor.

4. The circuit of claim 3 , wherein the charger sub-subcircuit is further configured to receive the second control signal to make the driving transistor in conduction state for passing a driving current to drive the OLED for emitting light.

5. The circuit of claim 3 , wherein the charger sub-subcircuit comprises:
a third transistor having a control terminal being provided with the second control signal, a first terminal coupled to the power terminal, and a second terminal coupled to a first terminal of the driving transistor;
a fourth transistor having a control terminal being provided with the first control signal, a first terminal coupled to the second terminal of the third transistor, and a second terminal coupled to the control terminal of the driving transistor;
a fifth transistor having a control terminal being provided with the first control signal, a first terminal coupled to a second terminal of the driving transistor, and a second terminal coupled to the reference voltage terminal.

6. The circuit of claim 3 , wherein the regulator sub-subcircuit comprises a sixth transistor and a second capacitor, wherein:
the sixth transistor has a control terminal being provided with the third control signal, a first terminal coupled to the data line, and a second terminal coupled to a first electrode of the second capacitor;
the second capacitor has a second electrode coupled to the control terminal of the driving transistor.

7. The circuit of claim 3 , wherein the power terminal provides the power-supply voltage at a high voltage level and the reference voltage terminal is grounded at a low voltage level.

8. A method for driving a touch-control pixel-driving circuit in a driving cycle including a first period, a second period, a third period, and a fourth period,
wherein the touch-control pixel-driving circuit includes:
a driving transistor;
an organic light-emitting diode (OLED) having a first electrode, and a second electrode coupled to a reference voltage terminal;
a light-sensing-touch sub-circuit coupled to a data line and a read line and configured to be reset by a first control signal and a second control signal to send a raw signal to the read line based on a high-level voltage at the data line, and to generate a sensing signal depended on a change of the raw signal due to a touch and send the sensing signal to the read line; and
a driving sub-circuit coupled to the driving transistor and configured to charge and discharge the driving transistor using a power-supply voltage from a power terminal and a data signal from the data line controlled by the first control signal, the second control signal and a third control signal, and to drive the OLED for emitting light;
wherein the driving transistor is electrically coupled to the data line and optically coupled through the light-sensing-touch sub-circuit to the read line; and
the first electrode is electrically coupled to the driving transistor and optically coupled through the light-sensing-touch sub-circuit to the read line;
the method comprising:
resetting the light-sensing-touch sub-circuit upon the first control signal to charge a power-supply voltage into a control terminal of the driving transistor further upon the second control signal in the first period;
discharging the control terminal of the driving transistor in the second period with the first control signal been maintained to keep the light-sensing-touch sub-circuit in a same state as in the first period;
sensing a light signal which is converted to a current signal in the third period and writing a data signal into the control terminal of the driving transistor controlled by the third control signal; and
transporting the current signal to the read line in the fourth period and using the second control signal

Assignees

• Boe Technology Group Co Ltd

Inventors

• Yang Shengji
• Dong Xue
• Lv Jing
• Chen Xiaochuan

Classifications

• G06F3/042

  by opto-electronic means · CPC title

• G06F3/0421

  by interrupting or reflecting a light beam, e.g. optical touch-screen · CPC title

• G06F3/04184

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

• G06F3/04164

  Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads · CPC title

• G09G3/3225

  using an active matrix · CPC title