CN105225643A - A kind of backlight electric current and voltage Circuit tuning and method - Google Patents
A kind of backlight electric current and voltage Circuit tuning and method Download PDFInfo
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- CN105225643A CN105225643A CN201510648405.0A CN201510648405A CN105225643A CN 105225643 A CN105225643 A CN 105225643A CN 201510648405 A CN201510648405 A CN 201510648405A CN 105225643 A CN105225643 A CN 105225643A
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Abstract
The present invention is applicable to field of liquid crystal, a kind of backlight electric current and voltage Circuit tuning and method are provided, by being provided with the main control chip for the SOVP1 pin of output voltage adjustment signal and the ISET1 pin for output current adjustment signal, be provided with the constant-current driven chip of the SOVP2 pin that is connected with the power end of backlight drive circuit and the ISET2 pin for input current, the current adjusting module being connected to the voltage regulator module between SOVP1 pin and SOVP2 pin and being connected between ISET1 pin and ISET2 pin, realize the adjustment of backlight voltage to backlight drive circuit and back facet current.The present invention, by controlling main control chip output voltage adjustment signal and current modifying signal, can realize the adjustment to backlight drive circuit voltage and electric current, does not need to change hardware parameter, improves the compatibility of backlight drive circuit.
Description
Technical field
The invention belongs to field of liquid crystal, particularly relate to a kind of backlight electric current and voltage Circuit tuning and method.
Background technology
Liquid crystal display or the liquid crystal TV set with liquid crystal display, the backlight drive circuit mainly through display interior drives backlight group luminous, to realize the Presentation Function of liquid crystal display.In the manufacturing process of liquid crystal display, because the size of the liquid crystal display to different model is different with brightness requirement, therefore, also can be different to the requirement of the backlight voltage and current of backlight drive circuit.In traditional design proposal, normally realized the adjustment of the voltage and current to backlight drive circuit by the mode of the hardware parameter in amendment backlight drive circuit, meet the requirements to make it.
But, when the voltage and current of backlight drive circuit is adjusted, usually only need to do small adjustment to the parameter of its hardware, when causing the liquid crystal display needing production in enormous quantities size different with brightness requirement, need to produce a large amount of PCBA (PrintedCircuitBoard+Assembly, the printed circuit board (PCB)) assembly only with minute differences, only there is minute differences due to these PCBA assemblies, therefore, be unfavorable for very much distinguishing and storing.
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of backlight electric current and voltage Circuit tuning and method, be intended to solve in traditional design scheme, during the liquid crystal display needing production in enormous quantities size different with brightness requirement, need to produce a large amount of PCBA (PrintedCircuitBoard+Assembly only with minute differences, printed circuit board (PCB)) assembly, be unfavorable for very much the problem distinguished and store.
The embodiment of the present invention is achieved in that a kind of backlight electric current and voltage Circuit tuning, is arranged in backlight drive circuit, comprises:
Be provided with the main control chip for the SOVP1 pin of output voltage adjustment signal and the ISET1 pin for output current adjustment signal;
Be provided with the constant-current driven chip of the SOVP2 pin corresponding with described SOVP1 pin, the ISET2 pin corresponding with described ISET1 pin;
Be connected between described SOVP1 pin and described SOVP2 pin, and be connected with the power end of described backlight drive circuit, to adjust the reference voltage of described SOVP2 pin according to described voltage adjustment signal, and then adjust the voltage regulator module of power end voltage of described backlight drive circuit;
Be connected between described ISET1 pin and described ISET2 pin, to adjust the reference voltage of described ISET2 pin according to described current modifying signal, and then adjust the current adjusting module of input current of described ISET2 pin.
Preferably, described voltage regulator module comprises resistance R1 and resistance R2, one end of the power end of backlight drive circuit described in described resistance R1 mono-termination, the other end and described SOVP1 pin, described SOVP2 pin and described resistance R2 connects altogether, the other end ground connection of described resistance R2.
Preferably, described voltage adjustment signal is square-wave signal.
Preferably, the resistance of described resistance R1 is 68K Ω, and the resistance of described resistance R2 is 1K Ω, and the frequency range of described square-wave signal is 10KHZ ~ 100KHZ, duty cycle range is 10% ~ 100%.
Preferably, described voltage adjustment signal is direct current signal.
Preferably, the resistance of described resistance R1 is 68K Ω, and the resistance of described resistance R2 is 1K Ω, and the voltage range of described direct current signal is 0V ~ 4V.
Preferably, described current adjusting module comprises resistance R3 and electric capacity C1, and one end of ISET1 pin described in described resistance R3 mono-termination, the other end and described ISET2 pin and described electric capacity C1 connects altogether, the other end ground connection of described electric capacity C1.
Preferably, described current modifying signal is square-wave signal.
Preferably, the resistance of described resistance R3 is 10K Ω, and the frequency range of described square-wave signal is 10KHZ ~ 100KHZ, duty cycle range is 10% ~ 100%.
The embodiment of the present invention also provides a kind of backlight electric current and voltage method of adjustment, and adjusted backlight voltage and the back facet current of backlight drive circuit by foregoing backlight electric current and voltage Circuit tuning, the method comprises:
The SOVP1 pin of main control chip sends voltage adjustment signal to voltage regulator module;
Voltage regulator module adjusts the reference voltage of the SOVP2 pin of constant-current driven chip according to described voltage adjustment signal, to adjust the power end voltage of backlight drive circuit;
The ISET1 pin of main control chip sends current modifying signal to current adjusting module;
Current adjusting module adjusts the reference voltage of the ISET2 pin of constant-current driven chip according to described current modifying signal, to adjust the input current of described ISET2 pin.
The embodiment of the present invention compared with prior art, beneficial effect is: by being configured for the SOVP1 pin of output voltage adjustment signal and the ISET1 pin for output current adjustment signal on main control chip, and adjusted the reference voltage of SOVP2 pin and the reference voltage of ISET2 pin of corresponding configuration on constant-current driven chip respectively according to described backlight voltage adjustment signal and described back facet current adjustment signal by backlight voltage regulator module and back facet current adjusting module, to adjust the voltage of backlight drive circuit and the input current of constant-current driven chip according to described reference voltage, make not need to carry out to the hardware in backlight drive circuit the adjustment that parameter change can realize backlight voltage and current, improve the compatibility of backlight drive circuit, and the management be convenient to when producing in enormous quantities and storage, when described voltage adjustment signal is square-wave signal, by changing the dutycycle of the voltage adjustment signal that main control chip exports, can adjusts the backlight voltage of backlight drive circuit, adapting to the liquid crystal display with different size or brightness requirement to make it, when described voltage adjustment signal is direct current signal, by changing the magnitude of voltage of the voltage adjustment signal that main control chip exports, can adjusts the backlight voltage of backlight drive circuit, adapting to the liquid crystal display with different size or brightness requirement to make it, when described current modifying signal is square-wave signal, by changing the dutycycle of the current modifying signal that main control chip exports, can adjusts the back facet current of backlight drive circuit, adapting to the liquid crystal display with different size or brightness requirement to make it.
Accompanying drawing explanation
Fig. 1 is the basic structure block diagram of the backlight electric current and voltage Circuit tuning that the embodiment of the present invention provides;
Fig. 2 is the circuit theory diagrams of the backlight electric current and voltage Circuit tuning that the embodiment of the present invention provides;
Fig. 3 is the FB(flow block) of the backlight electric current and voltage method of adjustment that the embodiment of the present invention provides;
Fig. 4 is the initialize flow block diagram of the PC end adjustment software that the embodiment of the present invention provides;
Fig. 5 is the initialize flow block diagram of the liquid crystal display to be adjusted that the embodiment of the present invention provides;
Fig. 6 is the process flow diagram being adjusted the backlight voltage and current of liquid crystal display by PC end adjustment software that the embodiment of the present invention provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Fig. 1 is the basic structure block diagram of the backlight electric current and voltage Circuit tuning that the embodiment of the present invention provides.
As shown in Figure 1, the backlight electric current and voltage Circuit tuning that the embodiment of the present invention provides, is arranged in backlight drive circuit, comprises:
Be provided with the main control chip U1 for the SOVP1 pin of output voltage adjustment signal and the ISET1 pin for output current adjustment signal;
Be provided with the constant-current driven chip U2 of the SOVP2 pin corresponding with described SOVP1 pin, the ISET2 pin corresponding with described ISET1 pin;
Be connected between described SOVP1 pin and described SOVP2 pin, and be connected with the power end V+ of described backlight drive circuit, to adjust the reference voltage of described SOVP2 pin according to described voltage adjustment signal, and then adjust the voltage regulator module 10 of power end V+ voltage of described backlight drive circuit;
Be connected between described ISET1 pin and described ISET2 pin, to adjust the reference voltage of described ISET2 pin according to described current modifying signal, and then adjust the current adjusting module 20 of input current of described ISET2 pin.
In a particular application, by configuring GPIO (GeneralPurposeInputOutput, universal input/output) pin unnecessary on the main control chip of liquid crystal display, SOVP1 pin and the ISET1 pin of main control chip is set to; By configuring GPIO (GeneralPurposeInputOutput, universal input/output) pin unnecessary on the constant-current driven chip of liquid crystal display, be set to SOVP2 pin and the ISET2 pin of constant-current driven chip.
In a particular application, the adjustment to backlight drive circuit voltage and electric current can be realized by the voltage adjustment signal and current modifying signal changing main control chip output, it is made not need to change the hardware parameter of backlight drive circuit, the liquid crystal display with different size and brightness requirement can be adapted to, improve the compatibility of backlight drive circuit.
Fig. 2 is the circuit theory diagrams of the backlight electric current and voltage Circuit tuning that the embodiment of the present invention provides.
As shown in Figure 2, in described backlight electric current and voltage Circuit tuning, voltage regulator module 10 comprises resistance R1 and resistance R2, and one end of the power end V+ of resistance R1 mono-termination backlight drive circuit, the other end and SOVP1 pin, SOVP2 pin and resistance R2 connects altogether, the other end ground connection of resistance R2; Current adjusting module 20 comprises resistance R3 and electric capacity C1, and one end of resistance R3 mono-termination ISET1 pin, the other end and ISET2 pin and electric capacity C1 connects altogether, the other end ground connection of electric capacity C1.
In a particular application, described voltage adjustment signal can be square-wave signal or direct current signal, described current modifying signal can be square-wave signal, resistance R1, the resistance of resistance R2 and resistance R3 can set according to actual needs, at resistance R1, after the resistance setting of resistance R2 and resistance R3, if desired the backlight voltage and current of backlight drive circuit is adjusted, then do not need to change resistance R1 again, the parameter of resistance R2 and these hardware of resistance R3, only need can realize adjusting backlight voltage and current by the change dutycycle of square-wave signal and the magnitude of voltage of direct current signal.
The dutycycle of square-wave signal that setting main control chip exports is the magnitude of voltage of A or direct current signal when being U0, the reference voltage of the SOVP2 pin of backlight driving chip is Ux, then power end voltage U=(R1+R2) * Ux/R2 of now backlight drive circuit, wherein, R1, R2 are respectively the resistance of resistance R1, resistance R2, and the maximum voltage value that the backlight drive circuit of corresponding liquid crystal display allows is U.In actual applications, because the resistance of resistance R1 and resistance R2 immobilizes, the magnitude of voltage of the backlight drive circuit that the difference that therefore will meet requires, needs by changing the dutycycle A of square-wave signal or the magnitude of voltage U0 of direct current signal to meet different designing requirements.
In a preferred embodiment, when described voltage adjustment signal is square-wave signal, the resistance of resistance R1 is 68K Ω, and the resistance of resistance R2 is 1K Ω, and the frequency range of square-wave signal is 10KHZ ~ 100KHZ, duty cycle range is 10% ~ 100%; Or, voltage adjustment signal is direct current signal, the resistance of resistance R1 is 68K Ω, the resistance of resistance R2 is 1K Ω, when the voltage range of direct current signal is 0V ~ 4V, the corresponding relation of the dutycycle of square-wave signal that main control chip exports or the reference voltage of SOVP2 pin of the voltage of direct current signal and backlight driving chip and the power end voltage of backlight drive circuit as shown in Table 1:
Table one
In a preferred embodiment, when described current modifying signal is square-wave signal, the resistance of resistance R3 is 10K Ω, when the frequency range of square-wave signal is 10KHZ ~ 100KHZ, duty cycle range is 10% ~ 100%, the corresponding relation of the dutycycle of square-wave signal that main control chip exports and the reference voltage of the ISET2 pin of backlight driving chip and input current as shown in Table 2:
Table two
In a particular application, electric current and voltage can be set up according to above-mentioned table one and table two and control gear storehouse, and be stored in the memory module of liquid crystal display.
Fig. 3 is the FB(flow block) of the backlight electric current and voltage method of adjustment that the embodiment of the present invention provides.
As shown in Figure 3, the backlight electric current and voltage method of adjustment that the present embodiment provides adjusts backlight voltage and the back facet current of backlight drive circuit by aforesaid backlight electric current and voltage Circuit tuning, and the method comprises:
S101: the SOVP1 pin of main control chip sends voltage adjustment signal to voltage regulator module;
S102: voltage regulator module adjusts the reference voltage of the SOVP2 pin of constant-current driven chip according to described voltage adjustment signal, to adjust the power end voltage of backlight drive circuit;
S103: the ISET1 pin of main control chip sends current modifying signal to current adjusting module;
S104: current adjusting module adjusts the reference voltage of the ISET2 pin of constant-current driven chip according to described current modifying signal, to adjust the input current of described ISET2 pin.
Fig. 4 is the initialize flow block diagram of the PC end adjustment software that the embodiment of the present invention provides.
In actual applications, need to install to control in PC end the backlight electric current and voltage adjustment software that main control chip in the backlight drive circuit of liquid crystal display exports the square-wave signal with different duty or the different current signal of magnitude of voltage, connected by respective I/O communication port between PC end and liquid crystal display, to realize PC end to the backlight voltage of the backlight drive circuit of liquid crystal display and the adjustment function of back facet current.
As shown in Figure 4, the initialize flow of PC end adjustment software is as follows:
S201: open the backlight electric current and voltage adjustment software in PC end;
S202: setting communication interface parameter;
S203: setting liquid crystal display needs best backlight voltage and the back facet current gear parameter of adjustment;
S204: open the communication interface be connected with described liquid crystal display, prepares to communicate with described liquid crystal display.
In a particular application, described communication interface is I/O interface.
Fig. 5 is the initialize flow block diagram of the liquid crystal display to be adjusted that the embodiment of the present invention provides.
In actual applications, before the backlight voltage adjusting the backlight drive circuit of liquid crystal display by above-mentioned PC end adjustment software and back facet current, need to carry out initialization to liquid crystal display.
As shown in Figure 5, the initialize flow of liquid crystal display is as follows:
S301: liquid crystal display system powers on and initialization;
S302: the SOVP1 pin of initialization main control chip and ISET1 pin;
S303: the electric current and voltage that initialization memory module stores controls gear storehouse;
S304: the common voltage electric current gear of setting current liquid crystal display, can normally show;
S305: open and hold with described PC the communication interface be connected, prepares to hold with described PC to communicate to receive described best backlight voltage and back facet current gear parameter.
In a particular application, described communication interface is I/O interface.
Fig. 6 is the process flow diagram being adjusted the backlight voltage and current of liquid crystal display by PC end adjustment software that the embodiment of the present invention provides.
As shown in Figure 6, after the backlight electric current and voltage adjustment software in PC end and the equal initialization of liquid crystal display system, using PC end adjustment software as executive agent, the flow process adjusting the backlight voltage and current of liquid crystal display is as follows:
The instruction entering adjustment modes is sent to liquid crystal display system to be adjusted;
Receive the mode bit that liquid crystal display systems to be adjusted returns, determine whether liquid crystal display systems to be adjusted enters adjustment modes;
If not, then adjust communication delay and the parameter of the instruction sent, check the connection of communication interface and bus;
If so, then best backlight voltage and back facet current gear parameter is sent to liquid crystal display system to be adjusted;
Receive liquid crystal display system to be adjusted through the best backlight voltage of check sum code comparison received by it and the whether correct feedback information of back facet current gear parameter;
If the best backlight voltage that feedback information display sends and back facet current gear parameter error, then return the step sending best backlight voltage and back facet current gear parameter to liquid crystal display system to be adjusted;
If the best backlight voltage that feedback information display sends and back facet current gear parameter are correctly, then receive the adjustment success status position that liquid crystal display system to be adjusted returns, terminate this adjustment.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a backlight electric current and voltage Circuit tuning, is arranged in backlight drive circuit, it is characterized in that, comprising:
Be provided with the main control chip for the SOVP1 pin of output voltage adjustment signal and the ISET1 pin for output current adjustment signal;
Be provided with the constant-current driven chip of the SOVP2 pin corresponding with described SOVP1 pin, the ISET2 pin corresponding with described ISET1 pin;
Be connected to described SOVP1 pin, between described SOVP2 pin and the power end of described backlight drive circuit, to adjust the reference voltage of described SOVP2 pin according to described voltage adjustment signal, and then adjust the voltage regulator module of power end voltage of described backlight drive circuit;
Be connected between described ISET1 pin and described ISET2 pin, to adjust the reference voltage of described ISET2 pin according to described current modifying signal, and then adjust the current adjusting module of input current of described ISET2 pin.
2. backlight electric current and voltage Circuit tuning as claimed in claim 1, it is characterized in that, described voltage regulator module comprises resistance R1 and resistance R2, one end of the power end of backlight drive circuit described in described resistance R1 mono-termination, the other end and described SOVP1 pin, described SOVP2 pin and described resistance R2 connects altogether, the other end ground connection of described resistance R2.
3. backlight electric current and voltage Circuit tuning as claimed in claim 2, it is characterized in that, described voltage adjustment signal is square-wave signal.
4. backlight electric current and voltage Circuit tuning as claimed in claim 3, it is characterized in that, the resistance of described resistance R1 is 68K Ω, and the resistance of described resistance R2 is 1K Ω, and the frequency range of described square-wave signal is 10KHZ ~ 100KHZ, duty cycle range is 10% ~ 100%.
5. backlight electric current and voltage Circuit tuning as claimed in claim 2, it is characterized in that, described voltage adjustment signal is direct current signal.
6. backlight electric current and voltage Circuit tuning as claimed in claim 5, it is characterized in that, the resistance of described resistance R1 is 68K Ω, and the resistance of described resistance R2 is 1K Ω, and the voltage range of described direct current signal is 0V ~ 4V.
7. backlight electric current and voltage Circuit tuning as claimed in claim 1, it is characterized in that, described current adjusting module comprises resistance R3 and electric capacity C1, one end of ISET1 pin described in described resistance R3 mono-termination, the other end and described ISET2 pin and described electric capacity C1 connects altogether, the other end ground connection of described electric capacity C1.
8. backlight electric current and voltage Circuit tuning as claimed in claim 7, it is characterized in that, described current modifying signal is square-wave signal.
9. backlight electric current and voltage Circuit tuning as claimed in claim 7, it is characterized in that, the resistance of described resistance R3 is 10K Ω, and the frequency range of described square-wave signal is 10KHZ ~ 100KHZ, duty cycle range is 10% ~ 100%.
10. a backlight electric current and voltage method of adjustment, is characterized in that, adjusted backlight voltage and the back facet current of backlight drive circuit by the backlight electric current and voltage Circuit tuning as described in any one of claim 1 ~ 9, the method comprises:
The SOVP1 pin of main control chip sends voltage adjustment signal to voltage regulator module;
Voltage regulator module adjusts the reference voltage of the SOVP2 pin of constant-current driven chip according to described voltage adjustment signal, to adjust the power end voltage of backlight drive circuit;
The ISET1 pin of main control chip sends current modifying signal to current adjusting module;
Current adjusting module adjusts the reference voltage of the ISET2 pin of constant-current driven chip according to described current modifying signal, to adjust the input current of described ISET2 pin.
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| CN201510648405.0A CN105225643B (en) | 2015-10-09 | 2015-10-09 | A kind of backlight voltage x current adjustment circuit and method |
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| CN201510648405.0A CN105225643B (en) | 2015-10-09 | 2015-10-09 | A kind of backlight voltage x current adjustment circuit and method |
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| CN106023871A (en) * | 2016-06-21 | 2016-10-12 | 深圳创维－Rgb电子有限公司 | Data processing method and data processing device of intelligent terminal constant current IC chip |
| CN106341631A (en) * | 2016-08-31 | 2017-01-18 | 深圳Tcl数字技术有限公司 | Backlight driving device and television set |
| CN108091296A (en) * | 2018-01-17 | 2018-05-29 | 合肥惠科金扬科技有限公司 | A kind of display driver circuit, method and display device |
| CN110379375A (en) * | 2019-06-25 | 2019-10-25 | 深圳市金锐显数码科技有限公司 | The automatic switching method and automatic switchover system of back facet current gear |
| CN111212281A (en) * | 2020-01-14 | 2020-05-29 | 深圳市金锐显数码科技有限公司 | Video board detection method and detection device |
| CN112530377A (en) * | 2020-12-08 | 2021-03-19 | 康佳集团股份有限公司 | Backlight display control chip and display device |
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| CN105225643B (en) | 2017-12-12 |
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