Active matrix organic light-emitting diode pixel circuit, method for driving the same, and display device

• US 9,317,153 B2
• Filed: 09/27/2013
• Issued: 04/19/2016
• Est. Priority Date: 06/26/2013
• 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: Tan, Wen, Qi, Xiaojing, Nie, Leisen
• Primary Examiner(s): SHENG, TOM V
• Application Number:
  US14/344,437
• Publication Number:
  US 20150220186A1
• Time in Patent Office: 935 Days
• Field of Search: 345/174, 345/175
• US Class Current: 1/1
• CPC Class Codes: G06F 2203/04101 2.5D-digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface and also measures the distance of the input means within a short range in the Z direction, possibly with a separate measurement setup
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0416 Control or interface arrangements specially adapted for digitisers
• CPC Class Codes: G06F 3/042 by opto-electronic means
• CPC Class Codes: G06F 3/044 by capacitive means
• CPC Class Codes: G09G 2300/0842 forming a memory circuit, e.g. a dynamic memory with one capacitor
• CPC Class Codes: G09G 2310/0256 with the purpose of reversing the voltage across a light emitting or modulating element within a pixel
• CPC Class Codes: G09G 2310/0262 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 Class Codes: G09G 2360/142 the light being detected by light detection means within each pixel
• CPC Class Codes: G09G 3/32 semiconductive, e.g. using light-emitting diodes [LED]
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: G09G 3/3258 with pixel circuitry controlling the voltage across 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

The present disclosure relates to a field of display technology, and provides an AMOLED pixel circuit, a method for driving the same, and a display device, which can improve an integration of an in-cell touch control circuit with an AMOLED driving circuit. The AMOLED pixel circuit comprises a light-emitting module, a touch control module, a control module, an output module and a driving and amplifying module. The MOLED pixel circuit provided in embodiments of the present disclosure can be used in the manufacture of the AMOLED display device.

Claims

1. An AMOLED pixel circuit, characterized by comprising a light-emitting module, a touch control module, a control module, an output module and a driving and amplifying module;

wherein

the light-emitting module is connected to the control module and a first voltage terminal, and is used for emitting light for display under a control of the control module;

the touch control module is connected to the control module, a fourth signal line and a second voltage terminal, and is used for receiving a touch input of a user and generating a first touch control signal;

the control module is further connected to a first signal line, a second signal line, a third signal line, and a data line, and is used for controlling the light-emitting module and the touch control module according to signals input from the signal lines, wherein the signal input from the first signal line is generated by delaying the signal input from the fourth signal line for a predetermined time, the data line is used for inputting a grayscale data for display by the light-emitting module or for outputting a second touch control signal indicating the touch input in a time division mode;

the driving and amplifying module is connected to the touch control module, the control module and the second voltage terminal, and is used for driving the light-emitting module or amplifying the first touch control signal from the touch control module to generate the second touch control signal; and

the output module is connected to a fifth signal line, the control module and the data line, and is used for outputting the second touch control signal to the data line, wherein the signal input from the second signal line is generated by delaying the signal input from the fifth signal line for a predetermined time.

2. The AMOLED pixel circuit of claim 1, characterized in that the light-emitting module comprises a light-emitting element, wherein the light-emitting element has one terminal connected to the control module and the other terminal connected to the first voltage terminal.

3. The AMOLED pixel circuit of claim 2, characterized in that the control module comprises:

a first transistor having a gate connected to the first signal line, and a first electrode connected to the light-emitting element;

a second transistor having a gate connected to the second signal line, and a second electrode connected to the data line;

a third transistor having a gate connected to the first signal line, a first electrode connected to a second electrode of the first transistor, and a second electrode connected to a first electrode of the second transistor; and

a fourth transistor having a gate connected to the third signal line, and a first electrode connected to the second electrode of the first transistor.

4. The AMOLED pixel circuit of claim 3, characterized in that the output module comprises a fifth transistor having a gate connected to the fifth signal line, a first electrode connected to the second electrode of the first transistor, and a second electrode connected to the data line.

5. The AMOLED pixel circuit of claim 4, characterized in that the driving and amplifying module comprises:

a sixth transistor having a gate connected to a second electrode of the fourth transistor, a first electrode connected to the second voltage terminal, and a second electrode connected to the second electrode of the first transistor; and

a storage capacitor having one terminal connected to the first electrode of the second transistor, and the other terminal connected to the second electrode of the fourth transistor.

6. The AMOLED pixel circuit of claim 5, characterized in that the touch control module comprises:

a seventh transistor having a gate connected to the fourth signal line, a first electrode connected to the first electrode of the second transistor, and a second electrode connected to the second voltage terminal;

an eighth transistor having a gate connected to the fourth signal line, and a second electrode connected to the second voltage terminal; and

an optoelectronic diode having an anode connected to a first electrode of the eighth transistor, and a cathode connected to the second electrode of the fourth transistor.

7. The AMOLED pixel circuit of claim 5, characterized in that the touch control module comprises:

a seventh transistor having a gate connected to the fourth signal line, a first electrode connected to the first electrode of the second transistor, and a second electrode connected to the second voltage terminal;

an eighth transistor having a gate connected to the fourth signal line, and a first electrode connected to the second electrode of the fourth transistor; and

a sensing electrode connected to a second electrode of the eighth transistor.

8. The AMOLED pixel circuit of claim 6 or 7, characterized in that

the first, second, third, fourth, fifth and sixth transistors are N-type transistors, and the seventh and eighth transistors are P-type transistors;

or

the first, second, third, fourth, fifth and sixth transistors are P-type transistors, and the seventh and eighth transistors are N-type transistors.

9. The AMOLED pixel circuit of claim 7, characterized in that

the first, second, third, fourth, fifth and sixth transistors are N-type transistors, and the seventh and eighth transistors are P-type transistors;

or

the first, second, third, fourth, fifth and sixth transistors are P-type transistors, and the seventh and eighth transistors are N-type transistors.

10. A display device, characterized by comprising the AMOLED pixel circuit of claim 1.

11. The display device of claim 10, characterized in that the light-emitting module comprises a light-emitting element, wherein the light-emitting element has one terminal connected to the control module and the other terminal connected to the first voltage terminal;

the control module comprises;

a first transistor having a gate connected to the first signal line, and a first electrode connected to the light-emitting element;

a second transistor having a gate connected to the second signal line, and a second electrode connected to the data line;

a third transistor having a gate connected to the first signal line, a first electrode connected to a second electrode of the first transistor, and a second electrode connected to a first electrode of the second transistor; and

a fourth transistor having a gate connected to the third signal line, and a first electrode connected to the second electrode of the first transistor.

12. The display device of claim 11, characterized in that the output module comprises a fifth transistor having a gate connected to the fifth signal line, a first electrode connected to the second electrode of the first transistor, and a second electrode connected to the data line;

the driving and amplifying module comprises;

a sixth transistor having a gate connected to a second electrode of the fourth transistor, a first electrode connected to the second voltage terminal, and a second electrode connected to the second electrode of the first transistor; and

a storage capacitor having one terminal connected to the first electrode of the second transistor, and the other terminal connected to the second electrode of the fourth transistor.

13. The display device of claim 12, characterized in that the touch control module comprises:

a seventh transistor having a gate connected to the fourth signal line, a first electrode connected to the first electrode of the second transistor, and a second electrode connected to the second voltage terminal;

an eighth transistor having a gate connected to the fourth signal line, and a second electrode connected to the second voltage terminal; and

an optoelectronic diode having an anode connected to a first electrode of the eighth transistor, and a cathode connected to the second electrode of the fourth transistor.

14. The display device of claim 12, characterized in that the touch control module comprises:

a seventh transistor having a gate connected to the fourth signal line, a first electrode connected to the first electrode of the second transistor, and a second electrode connected to the second voltage terminal;

an eighth transistor having a gate connected to the fourth signal line, and a first electrode connected to the second electrode of the fourth transistor; and

a sensing electrode connected to a second electrode of the eighth transistor.

15. A method for driving the AMOLED pixel circuit of claim 1, characterized by comprising:

switching off the light-emitting module, inputting an initialization signal from the data line, and initializing the touch control module and the driving and amplifying module by the control module according to the initialization signal;

receiving the touch input and generating the first touch control signal by the touch control module;

amplifying the first touch control signal to generate the second touch control signal by the driving and amplifying module and outputting the second touch control signal to the data line via the output module;

inputting the initialization signal from the data line, wherein the initialization signal pre-charges the driving and amplifying module;

switching off the light-emitting module and inputting a data signal from the data line;

switching off the touch control module, switching on the light-emitting module, and driving the light-emitting module by the driving and amplifying module to emit light for display.

16. The method of claim 15, characterized in that the AMOLED pixel circuit is the AMOLED pixel circuit of claim 6, the method particularly comprises:

an initialization phase, wherein the first transistor is turned off so that the light-emitting element is switched off, and the second transistor is turned off, the seventh and eighth transistors are turned on so that the touch control module is electrically connected to the gate of the sixth transistor, and the storage capacitor serves as a storage capacitor of the sixth transistor;

the third transistor is turned off, the fourth transistor is turned on, the fifth transistor is turned on, and the data line inputs an initialization signal and pre-charges the storage capacitor to a level of the initialization signal;

a touch control phase, wherein the third transistor and the fourth transistor are turned off, the seventh transistor and the eighth transistor are turned on, and the touch control module receives the touch input and generates the first touch control signal;

a reading phase, wherein the fifth transistor is turned on, and the sixth transistor amplifies the voltage at the gate of the sixth transistor and outputs the amplified voltage to the data line;

a charging phase, wherein the third transistor is turned off, the second, fourth, fifth, seventh and eighth transistors are turned on, the data line inputs the initialization signal so that the storage capacitor is charged;

a writing phase, wherein the third, fourth, fifth, seventh and eighth transistors are turned off, the second transistor is turned on, the data line input a grayscale voltage, and the storage capacitor is discharged to a cut-off state via the sixth transistor;

a light-emitting phase, wherein the second, fourth, and fifth transistors are turned off, the first and third transistors are turned on, and the sixth transistor drives the light-emitting element to emit light for display.

17. The method of claim 16, characterized in that the first, second, third, fourth, fifth and sixth transistors are N-type transistors, and the seventh and eighth transistors are P-type transistors;

or

the first, second, third, fourth, fifth and sixth transistors are P-type transistors, and the seventh and eighth transistors are N-type transistors.

18. The method of claim 15, characterized in that said receiving the touch control signal by the touch control module comprises:

determining to receive the touch input and generate the first touch control signal by the touch control module according to quantity of the light received by the optoelectronic diode when a touch operation is performed;

or

determining to receive the touch input and generate the first touch control signal by the touch control module according to a capacitance value of a sensing capacitor formed between a sensing electrode and a touch terminal of the user when the touch operation is performed.

19. The method of claim 17, characterized in that the AMOLED pixel circuit is the AMOLED pixel circuit of claim 7, the method particularly comprises:

an initialization phase, wherein the first transistor is turned off so that the light-emitting element is switched off, and the second transistor is turned off, the seventh and eighth transistors are turned on so that the touch control module is electrically connected to the gate of the sixth transistor, and the storage capacitor serves as a storage capacitor of the sixth transistor;

the third transistor is turned off, the fourth transistor is turned on, the fifth transistor is turned on, and the data line inputs an initialization signal and pre-charges the storage capacitor to a level of the initialization signal;

a touch control phase, wherein the third transistor and the fourth transistor are turned off, the seventh transistor and the eighth transistor are turned on, and the touch control module receives the touch input and generate the first touch control signal;

a reading phase, wherein the fifth transistor is turned on, and the sixth transistor amplifies the voltage at the gate of the sixth transistor and outputs the amplified voltage to the data line;

a charging phase, wherein the third transistor is turned off, the second, fourth, fifth, seventh and eighth transistors are turned on, the data line inputs the initialization signal so that the storage capacitor is charged;

a writing phase, wherein the third, fourth, fifth, seventh and eighth transistors are turned off, the second transistor is turned on, the data line input a grayscale voltage, and the storage capacitor is discharged to a cut-off state via the sixth transistor;

a light-emitting phase, wherein the second, fourth, and fifth transistors are turned off, the first and third transistors are turned on, and the sixth transistor drives the light-emitting element to emit light for display.

20. The method of claim 19, characterized in that the first, second, third, fourth, fifth and sixth transistors are N-type transistors, and the seventh and eighth transistors are P-type transistors;

or

the first, second, third, fourth, fifth and sixth transistors are P-type transistors, and the seventh and eighth transistors are N-type transistors.