CN202930009U - Liquid crystal display driving circuit - Google Patents
Liquid crystal display driving circuit Download PDFInfo
- Publication number
- CN202930009U CN202930009U CN 201220442445 CN201220442445U CN202930009U CN 202930009 U CN202930009 U CN 202930009U CN 201220442445 CN201220442445 CN 201220442445 CN 201220442445 U CN201220442445 U CN 201220442445U CN 202930009 U CN202930009 U CN 202930009U
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- liquid crystal
- crystal display
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- control unit
- voltage
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Abstract
The utility model relates to the technical field of liquid crystal display, and particularly relates to a liquid crystal display driving circuit. The liquid crystal display driving circuit comprises a DC conversion module and control unit. The DC conversion module comprises a voltage regulating unit, an on-off control unit and a DC conversion unit, wherein the voltage regulating unit, the on-off control unit and the DC conversion unit are sequentially connected, the control unit is connected with the on-off control unit, the voltage regulating unit regulates DC voltage coming from an external circuit so as to output operating voltage required by the DC conversion unit, the DC conversion unit receives the operating voltage outputted through the on-off control unit and converts the operating voltage into various operating voltage required by a novel liquid crystal display product in displaying, and the control unit is used for controlling turn-on and turn-off of the on-off control unit. The liquid crystal display driving circuit enables a power supply circuit of the liquid crystal display product to be stable, reliable, energy saving and environmental friendly.
Description
Technical field
The utility model relates to technical field of liquid crystal display, specifically a kind of liquid crystal display drive circuit.
Background technology
Along with the widespread use of lcd technology in the demonstration field, particularly in Novel LCD, LCD TV, several liquid crystal professional domains such as computer, panel computer and DIY integrated computer of pen, industry is more and more higher to the requirement of the aspects such as its display quality, lightening, environmental protection situation, especially the normal demonstration of the AVDD signal aspect demonstration, VGL signal and VGH signal is most important, any one signal can't normally be exported all can affect the display effect quality, and this just has higher requirement to the requirement of the feed circuit of liquid crystal display product.In general feed circuit, the normal low voltage difference line pressure regulator that uses is as current/direct-current conversion device, thereby export the required operating voltage of each circuit module of this liquid crystal display product, guarantee the normal demonstration of display, but this current/direct-current conversion device is easy to break down, cause it undesirable for electrical stability, the display quality of liquid crystal display product has been produced great impact.
Summary of the invention
For the deficiencies in the prior art, the utility model provides a kind of liquid crystal display drive circuit, and its stability is high, and is low in energy consumption, realizes energy-conserving and environment-protective when can guarantee the normal demonstration of liquid crystal display product.
for achieving the above object, the utility model is achieved through the following technical solutions: a kind of liquid crystal display drive circuit, comprise dc conversion modules and control module, described dc conversion modules comprises the pressure regulation unit, switch control unit and dc conversion unit, described pressure regulation unit, switch control unit and dc conversion unit are linked in sequence, described control module is connected with described switch control unit, described pressure regulation unit is regulated the DC voltage from external circuit, thereby the required operating voltage of output dc conversion unit, described dc conversion unit receives the operating voltage via this switch control unit output, and convert this operating voltage to each required operating voltage of this liquid crystal display product demonstration, described control module is used for conducting and the shutoff of gauge tap control module.
further, described pressure regulation unit is a low pressure difference linearity pressure regulator, this low pressure difference linearity pressure regulator comprises amplifier, the first metal-oxide-semiconductor, the first resistance R 1 and the second resistance R 2, the grid of described the first metal-oxide-semiconductor, source electrode, drain electrode respectively with the output terminal of described amplifier, power supply, one end of the first resistance R 1 is connected, and draw the output terminal of low voltage difference pressure regulator from the drain electrode of the first metal-oxide-semiconductor, receive the amplifier positive input after the other end of the first resistance R 1 and the second resistance R 2 are interconnected, the negative input of amplifier receives the DC voltage from external circuit, one end of the second resistance R 2 and the positive input of amplifier are connected, other end ground connection.
Further, described switch control unit is one second metal-oxide-semiconductor, and described the second metal-oxide-semiconductor comprises a grid, one source pole and a drain electrode, and this grid receives the control signal from control module, this source electrode is connected to the output terminal of this dc conversion unit, this drain electrode output services voltage.
Further, described switch control unit is triode, and described triode comprises a base stage, an emitter and a collector, and this base stage receives the control signal from control module, this emitter is connected to the output terminal of this dc conversion unit, this collector output services voltage.
Further, described control module is a microcontroller.
The beneficial effects of the utility model are: liquid crystal display drive circuit of the present utility model, whether adopt an ON-OFF control circuit to control its output services voltage at direct current transducer powers to liquid crystal panel, do not power during standby, energy efficient, adopt simultaneously a stable pressure regulation unit to realize stability to the power supply of liquid crystal display product, make the reliable and stable and energy-conserving and environment-protective of the feed circuit of this liquid crystal display product.
Description of drawings
Fig. 1 is the circuit structure block diagram of utility model;
Fig. 2 is the circuit theory diagrams of the pressure regulation unit in embodiment.
Embodiment
Now with embodiment, the utility model is further illustrated by reference to the accompanying drawings.
Embodiment 1,
with reference to shown in Figure 1, a kind of liquid crystal display drive circuit, comprise dc conversion modules 1 and control module 2, described dc conversion modules 1 comprises pressure regulation unit 11, switch control unit 12 and dc conversion unit 13, described pressure regulation unit 11, switch control unit 12 and dc conversion unit 13 are linked in sequence, described control module 2 is connected with described switch control unit 12, the DC voltage of 11 pairs of described pressure regulation unit from external circuit regulated, thereby the required operating voltage of output dc conversion unit 13, described dc conversion unit 13 receives the operating voltage via these switch control unit 12 outputs, and convert this operating voltage to each required operating voltage of this liquid crystal display product demonstration, described control module 2 is used for conducting and the shutoff of gauge tap control module 12.
with reference to shown in Figure 2, described pressure regulation unit 11 is a low pressure difference linearity pressure regulator, this low pressure difference linearity pressure regulator comprises amplifier, the first metal-oxide-semiconductor, the first resistance R 1 and the second resistance R 2, the grid of described the first metal-oxide-semiconductor, source electrode, drain electrode respectively with the output terminal of described amplifier, power supply, one end of the first resistance R 1 is connected, and draw the output terminal of low voltage difference pressure regulator from the drain electrode of the first metal-oxide-semiconductor, receive the amplifier positive input after the other end of the first resistance R 1 and the second resistance R 2 are interconnected, the negative input of amplifier receives the DC voltage from external circuit, one end of the second resistance R 2 and the positive input of amplifier are connected, other end ground connection.
Described switch control unit 12 is a metal-oxide-semiconductor, and described metal-oxide-semiconductor comprises a grid, one source pole and a drain electrode, and this grid receives the control signal from control module 2, and this source electrode is connected to the output terminal of this dc conversion unit 1, this drain electrode output services voltage.
Further, described control module 2 is a microcontroller.
Described embodiment 2 is identical with embodiment 1 basic structure, its difference is that described switch control unit 12 is the PNP triode, described triode comprises a base stage, an emitter and a collector, this base stage receives the control signal from control module 2, this emitter is connected to the output terminal of this dc conversion unit 1, this collector output services voltage.
Although specifically show and introduced the utility model in conjunction with preferred embodiment; but the those skilled in the art should be understood that; within not breaking away from the spirit and scope of the present utility model that appended claims limits; can make a variety of changes the utility model in the form and details, be protection domain of the present utility model.
Claims (5)
1. liquid crystal display drive circuit, comprise dc conversion modules and control module, it is characterized in that: described dc conversion modules comprises the pressure regulation unit, switch control unit and dc conversion unit, described pressure regulation unit, switch control unit and dc conversion unit are linked in sequence, described control module is connected with described switch control unit, described pressure regulation unit is regulated the DC voltage from external circuit, thereby the required operating voltage of output dc conversion unit, described dc conversion unit receives the operating voltage via this switch control unit output, and convert this operating voltage to each required operating voltage of liquid crystal display product demonstration, described control module is used for conducting and the shutoff of gauge tap control module.
2. a kind of liquid crystal display drive circuit according to claim 1, it is characterized in that: described pressure regulation unit is a low pressure difference linearity pressure regulator, this low pressure difference linearity pressure regulator comprises amplifier, the first metal-oxide-semiconductor, the first resistance R 1 and the second resistance R 2, the grid of described the first metal-oxide-semiconductor, source electrode, drain electrode respectively with the output terminal of described amplifier, power supply, one end of the first resistance R 1 is connected, and draw the output terminal of low voltage difference pressure regulator from the drain electrode of the first metal-oxide-semiconductor, receive the amplifier positive input after the other end of the first resistance R 1 and the second resistance R 2 are interconnected, the negative input of amplifier receives the DC voltage from external circuit, one end of the second resistance R 2 and the positive input of amplifier are connected, other end ground connection.
3. a kind of liquid crystal display drive circuit according to claim 1, it is characterized in that: described switch control unit is one second metal-oxide-semiconductor, described the second metal-oxide-semiconductor comprises a grid, one source pole and a drain electrode, this grid receives the control signal from control module, this source electrode is connected to the output terminal of this dc conversion unit, this drain electrode output services voltage.
4. a kind of liquid crystal display drive circuit according to claim 1, it is characterized in that: described switch control unit is triode, described triode comprises a base stage, an emitter and a collector, this base stage receives the control signal from control module, this emitter is connected to the output terminal of this dc conversion unit, this collector output services voltage.
5. a kind of liquid crystal display drive circuit according to claim 1, it is characterized in that: described control module is a microcontroller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220442445 CN202930009U (en) | 2012-08-31 | 2012-08-31 | Liquid crystal display driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220442445 CN202930009U (en) | 2012-08-31 | 2012-08-31 | Liquid crystal display driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202930009U true CN202930009U (en) | 2013-05-08 |
Family
ID=48219948
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220442445 Expired - Fee Related CN202930009U (en) | 2012-08-31 | 2012-08-31 | Liquid crystal display driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202930009U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112365854A (en) * | 2020-11-26 | 2021-02-12 | 李嘉睿 | Display driving circuit |
-
2012
- 2012-08-31 CN CN 201220442445 patent/CN202930009U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112365854A (en) * | 2020-11-26 | 2021-02-12 | 李嘉睿 | Display driving circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130508 Termination date: 20140831 |
|
| EXPY | Termination of patent right or utility model |