Driving circuit, operation method thereof and display apparatus

Patent metadata

Field	Value
Publication number	US-9698675-B2
Application number	US-201414427696-A
Country	US
Kind code	B2
Filing date	Jul 22, 2014
Priority date	Jan 23, 2014
Publication date	Jul 4, 2017
Grant date	Jul 4, 2017

Abstract

Provided are a driving circuit and its operation method and a display apparatus. The driving circuit comprises a boost circuit unit, a load unit and a voltage monitoring unit, the load unit is connected to a power source providing an initial input voltage, the boost circuit unit is connected to both the load unit and the voltage monitoring unit, the load unit is connected to the voltage monitoring unit; the load unit provides a resistor of fixed resistance value; and the voltage monitoring unit determines whether an actual voltage input into the boost circuit unit is smaller than a predetermined voltage, and generates a reset signal which is used to control the driving circuit to restart if it is determined that the actual voltage is smaller than the predetermined voltage. The driving circuit can perform self-detection of its own electro-static electricity, and perform self-recovery when detecting that an electro-static current exceeds the maximum current that the driving circuit can withstand, such that the capability of anti electro-static electricity of the display apparatus is improved.

First claim

What is claimed is:

1. A driving circuit, comprising a boost circuit unit, a load unit and a voltage monitoring unit, the load unit is connected to a power source providing an initial input voltage, the boost circuit unit is connected to both the load unit and the voltage monitoring unit, the load unit is connected to the voltage monitoring unit;
the load unit provides a resistor of fixed resistance value; and
the voltage monitoring unit determines whether an actual voltage input into the boost circuit unit is smaller than a predetermined voltage, and generates a reset signal which is used to control the driving circuit to restart if it is determined that the actual voltage is smaller than the predetermined voltage;
wherein the voltage monitoring unit comprises a voltage comparator, a signal input circuit and a logic circuit;
an inverting input terminal of the voltage comparator is connected to the boost circuit unit, the signal input circuit is connected to an output terminal of the voltage comparator, a second input terminal of the logic circuit is connected to the signal input circuit, a non-inverting input terminal of the voltage comparator is input with the predetermined voltage, and a first input terminal of the logic circuit is input with a high level signal;
the voltage comparator outputs a corresponding control voltage based on the actual voltage and the predetermined voltage;
the signal input circuit determines whether the voltage value of the control voltage is positive, if it is determined that the voltage value of the control voltage is positive, inputs a high level signal to the logic circuit, and if it is determined that the voltage value of the control voltage is negative, inputs a low level signal to the logic circuit; and
the logic circuit determines whether both a signal input by the first input terminal and a signal input by the second input terminal are high level signals, and generates the reset signal if it is determined that both the signal input by the first input terminal and the signal input by the second input terminal are high level signals.

2. The driving circuit according to claim 1 , wherein the boost circuit unit comprises an oscillator and a charge pump, and the charge pump is connected to the load unit and the voltage monitoring unit.

3. The driving circuit according to claim 1 , wherein the signal input circuit comprises a N type transistor and a P type transistor, a gate of the N type transistor is connected to the output terminal of the voltage comparator, a source of the N type transistor is input with a high level signal, a drain of the N type transistor is connected to the second input terminal of the logic circuit, a gate of the P type transistor is connected to the output terminal of the voltage comparator, a source of the P type transistor is input with a low level signal, and a drain of the P type transistor is connected to the second input terminal of the logic circuit.

4. A display apparatus comprising a driving circuit which adopts the driving circuit according to claim 1 .

5. An operation method of a driving circuit which comprises a boost circuit unit, a load unit and a voltage monitoring unit, the load unit is connected to a power source providing an initial input voltage, the boost circuit unit is connected to both the load unit and the voltage monitoring unit, the load unit is connected to the voltage monitoring unit; the load unit provides a resistor of fixed resistance value, and the operation method of a driving circuit comprises:
the voltage monitoring unit determining whether an actual voltage input into the boost circuit unit is smaller than a predetermined voltage, and generating a reset signal which is used to control the driving circuit to restart if it is determined that the actual voltage is smaller than the predetermined voltage;
wherein the voltage monitoring unit comprises a voltage comparator, a signal input circuit and a logic circuit; an inverting input terminal of the voltage comparator is connected to the boost circuit unit, the signal input circuit is connected to an output terminal of the voltage comparator, a second input terminal of the logic circuit is connected to the signal input circuit, a non-inverting input terminal of the voltage comparator is input with the predetermined voltage, and a first input terminal of the logic circuit is input with a high level signal;
the voltage monitoring unit determining whether an actual voltage input into the boost circuit unit is smaller than a predetermined voltage comprises:
the voltage comparator outputting a corresponding control voltage based on the actual voltage and the predetermined voltage;
the signal input circuit determining whether the voltage value of the control voltage is positive, if it is determined that the voltage value of the control voltage is positive, inputting a high level signal to the logic circuit, and if it is determined that the voltage value of the control voltage is negative, inputting a low level signal to the logic circuit; and
the logic circuit determining whether both a signal input by the first input terminal and a signal input by the second input terminal are high level signals, and generating the reset signal if it is determined that both the signal input by the first input terminal and the signal input by the second input terminal are high level signals.

6. The operation method of the driving circuit according to claim 5 , wherein the signal input circuit comprises a N type transistor and a P type transistor, a gate of the N type transistor is connected to the output terminal of the voltage comparator, a source of the N type transistor is input with a high level signal, a drain of the N type transistor is connected to the second input terminal of the logic circuit, a gate of the P type transistor is connected to the output terminal of the voltage comparator, a source of the P type transistor is input with a low level signal, and a drain of the P type transistor is connected to the second input terminal of the logic circuit.

7. The driving circuit according to claim 2 , wherein the voltage monitoring unit comprises a voltage comparator, a signal input circuit and a logic circuit;
an inverting input terminal of the voltage comparator is connected to the boost circuit unit, the signal input circuit is connected to an output terminal of the voltage comparator, a second input terminal of the logic circuit is connected to the signal input circuit, a non-inverting input terminal of the voltage comparator is input with the predetermined voltage, and a first input terminal of the logic circuit is input with a high level signal;
the voltage comparator outputs a corresponding control voltage based on the actual voltage and the predetermined voltage;
the signal input circuit determines whether the voltage value of the control voltage is positive, if it is determined that the voltage value of the control voltage is positive, inputs a high level signal to the logic circuit, and if it is determined that the voltage value of the control voltage is negative, inputs a low level signal to the logic circuit; and
the logic circuit determines whether both a signal input by the first input terminal and a signal input by the second input terminal are high level signals, and generates the reset signal if it is determined that both the signal input by the first input terminal and the signal input by the second input terminal are high level signals.

8. The driving circuit according to claim 7 , wherein the signal input circuit comprises a N type transistor and a P type transistor, a gate of the N type transistor is connected to the output terminal of the voltage comparator, a source of the N type transistor is input with a high

Assignees

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

Inventors

• Zhang Zhengxin
• Xu Shuai
• Cao Jie
• Wang Zhiyong

Classifications

• G09G2330/04

  Display protection · CPC title

• G09G2330/028

  Generation of voltages supplied to electrode drivers in a matrix display other than LCD · CPC title

• H02M3/07 Primary

  using capacitors charged and discharged alternately by semiconductor devices with control electrode {, e.g. charge pumps} · CPC title

• G09G2330/08

  Fault-tolerant or redundant circuits, or circuits in which repair of defects is prepared · CPC title

• G02F1/136204

  Arrangements to prevent high voltage or static electricity failures · CPC title