Driving circuit and display panel

• US 9,330,626 B2
• Filed: 12/13/2013
• Issued: 05/03/2016
• Est. Priority Date: 12/14/2012
• Status: Active Grant

• Current Assignee: Beijing BOE Display Technology Co Ltd (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Original Assignee: Beijing BOE Display Technology Co Ltd (BOE Technology Group Co., Ltd.), BOE Technology Group Co., Ltd.
• Inventors: Wang, Jieqiong
• Primary Examiner(s): Shah, Priyank
• Application Number:
  US14/105,468
• Publication Number:
  US 20140168046A1
• Time in Patent Office: 872 Days
• US Class Current: 1/1
• CPC Class Codes: G09G 2310/0248 Precharge or discharge of column electrodes before or after applying exact column voltages
• CPC Class Codes: G09G 2310/0291 Details of output amplifiers or buffers arranged for use in a driving circuit
• CPC Class Codes: G09G 2320/0252 Improving the response speed
• CPC Class Codes: G09G 3/3688 suitable for active matrices only
• CPC Class Codes: G09G 3/3696 Generation of voltages supplied to electrode drivers
• CPC Class Codes: H03K 6/02 Amplifying pulses

Abstract

Provided are a driving circuit and a display panel, the driving circuit comprises a voltage dividing module, a comparing module and a switching module, wherein the voltage dividing module has a first terminal connected to a first terminal of the switching module, a second terminal connected to a first terminal of the comparing module, and a third terminal serving as a grounding terminal; a second terminal of the comparing module is connected to a first voltage input terminal, third, fourth and fifth terminals of the comparing module are connected to three control terminals of the switching module respectively; the first terminal of the switching module is connected to a voltage output terminal, a second terminal of the switching module is connected to the first voltage input terminal, and third and fourth terminals of the switching module are connected to second and third voltage input terminal, respectively.

Claims

1. A driving circuit comprising a voltage dividing module, a comparing module and a switching module, wherein

a first terminal of the voltage dividing module is connected to a first terminal of the switching module, a second terminal of the voltage dividing module is connected to a first terminal of the comparing module, and a third terminal of the voltage dividing module serves as a grounding terminal;

the voltage dividing module receives an output voltage of the switching module, and outputs a feedback voltage to the comparing module after dividing the output voltage;

a second terminal of the comparing module is connected to a first voltage input terminal, third, fourth and fifth terminals of the comparing module are connected to three control terminals of the switching module respectively;

the comparing module outputs control signals to the switching module according to a comparison of the feedback voltage and a first voltage input from the first voltage input terminal;

the first terminal of the switching module is connected to a voltage output terminal, a second terminal of the switching module is connected to the first voltage input terminal, a third terminal of the switching module is connected to a second voltage input terminal, and a fourth terminal of the switching module is connected to a third voltage input terminal;

the switching module controls its own state according to the control signals output from the comparing module so as to output a voltage to the voltage output terminal,

wherein the second voltage of the second voltage input terminal is higher than the first voltage of the first voltage input terminal, and the first voltage of the first voltage input terminal is higher than the third voltage of the third voltage input terminal,

the switching module outputs the second voltage to the voltage output terminal when the feedback voltage is lower than the first voltage, and outputs the first voltage to the voltage output terminal when the feedback voltage is equal to the first voltage, wherein the first voltage is a target driving voltage.

2. The driving circuit of claim 1, wherein the voltage dividing module comprises a structure formed by a first resistor and a second resistor connected in series, two terminals of the structure serve the first terminal and the third terminal of the voltage dividing module respectively, and a point where the first resistor and the second resistor are connected serves as the second terminal of the voltage dividing module.

3. The driving circuit of claim 1, wherein the switching module comprises a first switch, a second switch, and a third switch, wherein:

a first terminal of the first switch, a first terminal of the second switch, and a first terminal of the third switch serve as the three control terminals of the switching module;

a second terminal of the first switch, a second terminal of the second switch and a second terminal of the third switch are connected together for severing as the first terminal of the switching module;

a third terminal of the third switch severs as the second terminal of the switching module;

a third terminal of the first switch severs as the third terminal of the switching module; and

a third terminal of the second switch severs as the fourth terminal of the switching module.

4. A display panel comprising a driving circuit, wherein the driving circuit comprises a voltage dividing module, a comparing module and a switching module, wherein

a first terminal of the voltage dividing module is connected to a voltage output terminal, a second terminal of the voltage dividing module is connected to a first terminal of the comparing module, and a third terminal of the voltage dividing module serves as a grounding terminal;

the voltage dividing module receives an output voltage of the switching module, and outputs a feedback voltage to the comparing module after dividing the output voltage;

a second terminal of the comparing module is connected to a first voltage input terminal, third, fourth and fifth terminals of the comparing module are connected to three control terminals of the switching module respectively;

the comparing module outputs control signals to the switching module according to a comparison of the feedback voltage and a first voltage input from the first voltage input terminal; and

a first terminal of the switching module is connected to a voltage output terminal, a second terminal of the switching module is connected to the first voltage input terminal, a third terminal of the switching module is connected to a second voltage input terminal, and a fourth terminal of the switching module is connected to a third voltage input terminal;

the switching module controls its own state according to the control signals output from the comparing module so as to output a voltage to the voltage output terminal,

wherein the second voltage of the second voltage input terminal is higher than the first voltage of the first voltage input terminal, and the first voltage of the first voltage input terminal is higher than the third voltage of the third voltage input terminal,

the switching module outputs the second voltage to the voltage output terminal when the feedback voltage is lower than the first voltage, and outputs the first voltage to the voltage output terminal when the feedback voltage is equal to the first voltage, wherein the first voltage is a target driving voltage.

5. The display panel of claim 4, wherein the display panel is a Thin Film Transistor Liquid Crystal Display panel.

6. The display panel of claim 4, wherein the voltage dividing module comprises a structure formed by a first resistor and a second resistor connected in series, two terminals of the structure serve the first terminal and the third terminal of the voltage dividing module respectively, and a point where the first resistor and the second resistor are connected serves as the second terminal of the voltage dividing module.

7. The display panel of claim 4, wherein the switching module comprises a first switch, a second switch, and a third switch, wherein:

a first terminal of the first switch, a first terminal of the second switch, and a first terminal of the third switch serve as the three control terminals of the switching module;

a second terminal of the first switch, a second terminal of the second switch and a second terminal of the third switch are connected together for severing as the first terminal of the switching module;

a third terminal of the third switch severs as the second terminal of the switching module;

a third terminal of the first switch severs as the third terminal of the switching module; and

a third terminal of the second switch severs as the fourth terminal of the switching module.