CN202093788U - Liquid crystal display module control system - Google Patents
Liquid crystal display module control system Download PDFInfo
- Publication number
- CN202093788U CN202093788U CN2011201729843U CN201120172984U CN202093788U CN 202093788 U CN202093788 U CN 202093788U CN 2011201729843 U CN2011201729843 U CN 2011201729843U CN 201120172984 U CN201120172984 U CN 201120172984U CN 202093788 U CN202093788 U CN 202093788U
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- switch assembly
- driving circuit
- module
- control system
- voltage
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- Liquid Crystal Display Device Control (AREA)
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Abstract
The utility model discloses a liquid crystal display module control system, which relates to the technical field of electronics, resolves a problem that a driving circuit is damaged caused by insufficient voltage tolerence of the driving circuit, and reduces manufacture cost. The liquid crystal display module control system comprises at least one power source supply module, a light-emitting diode module, the driving circuit and at least one first switch assembly. The liquid crystal display module control system is characterized by further comprising at least one voltage clamping circuit which is connected with the first switch assembly and the driving circuit and used for clamping the voltage of an output terminal of the driving circuit. The driving circuit comprises a current source and at least one second switch assembly. The current source is used for providing current. The second switch assembly is connected between the current source and the first switch assembly. The second switch assembly is selectively switched on or switched off to determine driving signals according to pulse width modulation signals. When the second switch assembly is switched on, the first switch assembly is switched on. When the second switch assembly is switched off, the first switch assembly is switched off.
Description
Technical field
The utility model relates to a kind of liquid crystal display module control system.
Background technology
The control system of existing liquid crystal display module, a plurality of switches determine according to the pulse width modulation signal conducting or not conducting produce drive signal, corresponding a plurality of light emitting diode secondary module enables or does not enable according to this drive signal, when a plurality of switch conduction, magnitude of voltage on the compensating circuit acquisition node is given dc voltage changer with the value of affording redress, and dc voltage changer is just according to required operating voltage on this offset output back light module control system afterwards.When a plurality of switches not during conducting, because the electric capacity of each light emitting diode secondary module can be near operating voltage much larger than the voltage of node, therefore, a plurality of current sources adopt the mode of electric current groove to reach Current Control, in other words, the electric current of each light emitting diode secondary module of flowing through is controlled through the mode of current mirror by the transistor of driving circuit inside, in addition, for the ability that reduces consumed power and improve drive current, most of driving circuit that adopts the electric current groove to reach Current Control all is to adopt lower withstand voltage processing procedure.Yet, as mentioned above, the voltage of node can be near operating voltage when the light emitting diode secondary module does not enable, therefore operating voltage V can not be greater than the withstand voltage of driving circuit, thus, each light-emitting diode (LED) module just can't comprise too many light emitting diode, therefore, at the large scale display panel of many light emitting diodes of needs, can cause the more driving circuit of module needs backlight and increase manufacturing cost.
Summary of the invention
The objective of the invention is to: a kind of liquid crystal display module control system is provided, make when the liquid crystal display module control system uses the driving circuit of low pressure, system still can use higher operating voltage to drive the light emitting diode of many series connection, to solve problem and the reduction manufacturing cost that causes the damage of driving circuit because of the withstand voltage deficiency of driving circuit.
The technical scheme that the utility model is taked is: a kind of liquid crystal display module control system, comprise: a kind of liquid crystal display module control system, comprise: at least one power supply module, light-emitting diode (LED) module, driving circuit, at least one first switch module, it is characterized in that: further comprising: at least one voltage clamping circuit, misfortune is connected to this first switch module and this driving circuit, be used for the voltage of exit point of this driving circuit of strangulation, this driving circuit includes: a current source, be used to provide an electric current, and at least one second switch assembly, the misfortune being connected between this current source and this first switch module, this second switch assembly be according to a pulse width modulation signal and optionally conducting or not conducting decide this drive signal.During described second switch assembly conducting, this first switch module conducting, and when this second switch assembly not during conducting, this not conducting of first switch module.
The beneficial effect that the utility model reaches is: when the light emitting diode secondary module of liquid crystal display module control system does not enable, the voltage of the output terminal of driving circuit can be near the operating voltage of back light module control system, therefore back light module control system can use higher operating voltage to drive more light emitting diode, therefore the large scale display panel at many light emitting diodes of needs can reduce the required driving circuit of liquid crystal display module control system, and then reaches the beneficial effect that reduces manufacturing cost.
Description of drawings
Fig. 1 is a module map of the present utility model.
Fig. 2 is an embodiment synoptic diagram of the present utility model.
Embodiment
With reference to figure 1,2, the liquid crystal display module control system comprises a driver module 5, light-emitting diode (LED) module 2, a plurality of first switch module 3, a plurality of voltage clamping module 4 and a direct current voltage module 1, DC voltage module 1 is used to provide system's required voltage as a voltage supply module.Each first switch module 3 does in fact with a N type metal-oxide semiconductor transistor, and the voltage of its grid is about 3.3v-5v, in addition, driving circuit 5 includes a plurality of current sources 51 and corresponding a plurality of second switch assembly 52, and wherein a plurality of current sources 51 adopt the mode of above-mentioned electric current groove to reach Current Control; Light-emitting diode (LED) module 2 includes the light emitting diode 211 that a plurality of light emitting diode secondary module 21 each light emitting diode secondary module 21 all include a plurality of series connection.In the operation of liquid crystal display module control system, a plurality of second switch assemblies 52 can be according to pulse width modulation signals conducting or not conducting produce a drive signal, corresponding a plurality of light emitting diode secondary modules 21 enable or do not enable according to this drive signal.When a plurality of second switch assembly 52 conductings, voltage clamping module 4 with the magnitude of voltage strangulation on the node at a ground voltage and much smaller than the withstand voltage of driver module 5, in addition, because the grid of first switch module 3 and the voltage difference of node are greater than the critical voltage of first switch module 3, therefore first switch module 3 also is the state of conducting.When a plurality of second switch assemblies 52 change not conducting into by conducting, this moment a plurality of first switch modules 3 be still the state of conducting, and the voltage of node can raise gradually up to the voltage difference of the grid of a plurality of first switch modules 3 and the node critical voltage less than first switch module 3, because the grid voltage of first switch module 3 is about 3.3v-5v, so the magnitude of voltage of node is the highest and much smaller than the withstand voltage of general driving circuit.Therefore, the liquid crystal display module control system drives more light emitting diode 211 to use higher operating voltage, that is each light emitting diode secondary module 21 can include more light emitting diode 211, therefore can reduce the cost of driving circuit 5.
Claims (2)
1. liquid crystal display module control system, comprise: at least one power supply module, light-emitting diode (LED) module, driving circuit, at least one first switch module, it is characterized in that: further comprising: at least one voltage clamping circuit, misfortune is connected to this first switch module and this driving circuit, be used for the voltage of exit point of this driving circuit of strangulation, this driving circuit includes: a current source, be used to provide an electric current, and at least one second switch assembly, the misfortune being connected between this current source and this first switch module, this second switch assembly be according to a pulse width modulation signal and optionally conducting or not conducting decide this drive signal.
2. liquid crystal display module control system as claimed in claim 1 is characterized in that, during described second switch assembly conducting, and this first switch module conducting, and when this second switch assembly not during conducting, this not conducting of first switch module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201729843U CN202093788U (en) | 2011-05-27 | 2011-05-27 | Liquid crystal display module control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201729843U CN202093788U (en) | 2011-05-27 | 2011-05-27 | Liquid crystal display module control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202093788U true CN202093788U (en) | 2011-12-28 |
Family
ID=45368841
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201729843U Expired - Lifetime CN202093788U (en) | 2011-05-27 | 2011-05-27 | Liquid crystal display module control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202093788U (en) |
-
2011
- 2011-05-27 CN CN2011201729843U patent/CN202093788U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Address after: 4, building 518000, building 3, Jincheng science and Technology Industrial Zone, industrial road, Longhua street, Longhua New District, Shenzhen, Guangdong, China Patentee after: SHENZHEN TONESTAR POLYTRON TECHNOLOGY CO., LTD. Address before: 4 building, 2 floor, Jincheng Industrial Park, Longhua Industrial Road, Baoan District, Guangdong, Shenzhen, 518000 Patentee before: Shenzhen Tongxingda Technology Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20111228 |