CN108933590A - A kind of voltage conversion circuit and lighting test device - Google Patents
A kind of voltage conversion circuit and lighting test device Download PDFInfo
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- CN108933590A CN108933590A CN201810200310.6A CN201810200310A CN108933590A CN 108933590 A CN108933590 A CN 108933590A CN 201810200310 A CN201810200310 A CN 201810200310A CN 108933590 A CN108933590 A CN 108933590A
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- voltage
- analog converter
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
- H03K19/017509—Interface arrangements
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/1306—Details
- G02F1/1309—Repairing; Testing
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/66—Digital/analogue converters
Abstract
The present invention provides a kind of voltage conversion circuit, including the first digital analog converter, the second digital analog converter and operation conversion module.The input terminal of first digital analog converter receives the first configuration device and is instructed according to the polarity that test request exports, and output end exports first voltage or second voltage.The input terminal of second digital analog converter receives the second configuration device and is instructed according to the gray level information that test request exports, and output end exports grayscale alternating voltage.The first input end of operation conversion module is connected with the output end of the first digital analog converter, second input terminal of operation conversion module is connected with the output end of the second digital analog converter, according to first voltage or second voltage, the output end output of operation conversion module meets the polarity driven voltage of test request.The present invention also provides a kind of lighting test devices.Voltage conversion circuit and lighting test device of the invention can switch positive/negative-pressure polarity and change configuration information, and not needing professional, programming program improves test and debugging efficiency again.
Description
Technical field
The present invention relates to liquid crystal detection technique field more particularly to a kind of voltage conversion circuits and lighting test device.
Background technique
In the production process of liquid crystal display panel (LCD panel), in order to guarantee the yields of LCD panel production, it usually needs
Lighting detection is carried out to LCD panel, non-defective unit is passed to subsequent processing, and defective products is then repaired or scrapped.
With the continuous development of liquid crystal display production technology, the lighting testing requirements of LCD panel are higher and higher.It is currently used
Although output signal can satisfy test request at this stage to positive/negative-pressure lighting test device (Shorting Bar), but there are two
A major defect：Although first defect is can to switch positive/negative-pressure polarity, switching is required on change circuit board every time
Resistance；Second defect is to require to look for professional's programming program again every time when needing to finely tune source voltage.Therefore, make
It is tested with existing lighting test device, strong influence test and debugging efficiency.
Summary of the invention
In view of this, it is an object of that present invention to provide a kind of voltage conversion circuits, to improve test and debugging efficiency.
Specifically, the embodiment of the present invention provides a kind of voltage conversion circuit, including the first digital analog converter, the second digital-to-analogue turn
Parallel operation and operation conversion module, the input terminal of first digital analog converter receive the first configuration device and are exported according to test request
Polarity instruction, the output end output first voltage or second voltage of first digital analog converter.Second digital-to-analogue conversion
The input terminal of device receives the second configuration device and is instructed according to the gray level information that test request exports, second digital analog converter
Output end exports grayscale alternating voltage.The output of the first input end of the operation conversion module and first digital analog converter
End is connected, and the second input terminal of the operation conversion module is connected with the output end of second digital analog converter, according to described
First voltage or the second voltage, the output end output of the operation conversion module meet the polarity driven of the test request
Voltage.
Further, the voltage conversion circuit includes voltage follower, the normal phase input end of the voltage follower with
The output end of the operation conversion module is connected, the output of the inverting input terminal of the voltage follower and the voltage follower
End is connected.
Further, the operation conversion module includes first resistor, second resistance, 3rd resistor, the 4th resistance and fortune
Amplifier is calculated, the first end of the first resistor is connected with the first input end of the operation conversion module, the first resistor
Second end be connected with the inverting input terminal of the operational amplifier, the first end of the second resistance and the operational amplifier
Inverting input terminal be connected, the second end of the second resistance is connected with the output end of the operational amplifier, and the third is electric
The first end of resistance is connected with the second input terminal of the operation conversion module, and the second end of the 3rd resistor is put with the operation
The normal phase input end of big device is connected, and the first end of the 4th resistance is connected with the normal phase input end of the operational amplifier, institute
State the second end ground connection of the 4th resistance.
Further, the resistance value of the first resistor is n times of the resistance value of the second resistance, the resistance of the 4th resistance
Value is n times of the resistance value of the 3rd resistor.
Further, first digital analog converter and second digital analog converter are same device.
The embodiment of the present invention also provides a kind of lighting test device, and the lighting test device includes DAC processing module, institute
State the voltage conversion circuit that DAC processing module includes above-described embodiment.
Further, which further includes host computer and signal generator module.The host computer is according to configuration
Information exports configuration-direct.The signal generator module is connected with the host computer and the DAC processing module respectively, the letter
Number generation module includes first configuration device and second configuration device, and the signal generator module is according to the configuration
Instruction output direct voltage drive signal, gate drive signal and bus signals, test panel receive the direct voltage drive
Signal and the gate drive signal.The DAC processing module obtains polarity instruction and described according to the bus signals
Gray level information instruction, and source electrode driving signal is exported to the test panel.
Further, host computer is connect with SD card, for reading or saving the configuration information.
Further, the bus signals include I2C signal or SPI signal.
Further, the configuration information includes resolution ratio, refresh rate and source pole driving mode.
Technical solution bring beneficial effect provided in an embodiment of the present invention is：
Voltage conversion circuit and lighting test device of the invention can switch positive/negative-pressure polarity, and without changing circuit board
On resistance, also using host computer change configuration information (such as source drive voltage, driving DC voltage and gate driving electricity
Pressure), professional's programming program again is not needed, the driving signal for needing the output test of lighting test device greatly mentions
High test and debugging efficiency.
For above and other objects, features and advantages of the invention can be clearer and more comprehensible, preferred embodiment is cited below particularly,
And cooperate institute's accompanying drawings, it is described in detail below.
Detailed description of the invention
Fig. 1 is the circuit diagram of the voltage conversion circuit of one embodiment of the invention.
Fig. 2 is the circuit structure diagram of the voltage conversion circuit of one embodiment of the invention.
Fig. 3 is the circuit diagram of the lighting test device of one embodiment of the invention.
Fig. 4 is the circuit diagram of the lighting test device of another embodiment of the present invention.
Specific embodiment
Further to illustrate that the present invention is the technical means and efficacy realizing expected purpose and being taken, below in conjunction with attached drawing
And preferred embodiment, to the specific embodiment of voltage conversion circuit proposed according to the present invention and lighting test device, method,
Step, structure, feature and effect, detailed description is as follows.
For the present invention aforementioned and other technology contents, feature and effect refer to the preferable reality of schema in following cooperation
Applying in the detailed description of example to be clearly presented.By the explanation of specific embodiment, when expection can be reached to the present invention
The technical means and efficacy that purpose is taken be able to more deeply and it is specific understand, however institute's accompanying drawings be only to provide with reference to
Purposes of discussion is not intended to limit the present invention.
Referring to FIG. 1, Fig. 1 is the circuit diagram of the voltage conversion circuit of one embodiment of the invention.As shown in Figure 1, electric
Voltage conversion circuit includes the first digital analog converter 110, the second digital analog converter 120 and operation conversion module 130.First digital-to-analogue turns
The input terminal 111 of parallel operation 110 receives the first configuration device 200 and is instructed according to the polarity that test request exports, the first digital-to-analogue conversion
The output end 112 of device 110 exports first voltage or second voltage.The input terminal of second digital analog converter 120 receives the second configuration
Device 300 is instructed according to the gray level information that test request exports, and the output end 122 of the second digital analog converter 120 exports grayscale and hands over
Galvanic electricity pressure.The first input end 131 of operation conversion module 130 is connected with the output end 112 of the first digital analog converter 110, operation
Second input terminal 132 of conversion module 130 is connected with the output end 122 of the second digital analog converter 120, according to first voltage or
Two voltages, the output end 133 of operation conversion module 130 export the polarity driven voltage for meeting test request.
In an embodiment of the present invention, voltage conversion circuit includes voltage follower 140, voltage follower 140 it is defeated
Enter end 141 to be connected with the output end 133 of operation conversion module 130, receiving polarity driving voltage, and is exported in its output end 142
Voltage identical with polarity driven voltage, enhances the driving capability of circuit.
Specifically, existing voltage conversion circuit is only by a voltage signal in voltage range, such as 0V~12V
Grayscale alternating voltage, the immutable voltage signal of output voltage range is obtained by operation conversion module 130, such as double
Polar voltages signal.And when actual test, which needs to switch positive/negative-pressure polarity, such as the voltage conversion circuit
It needs that output cathode voltage can be switched to from output bipolar voltage, i.e., test scope needs to change, and existing voltage
As soon as what conversion circuit obtained is the immutable voltage signal of an output voltage range, the electricity changed on circuit board is generally needed
Resistance changes output voltage range with this.Therefore, existing voltage conversion circuit switching positive/negative-pressure polarity carries out replacement electricity
The operation of resistance on the plate of road, reduces testing efficiency.
The input terminal 111 of first digital analog converter 110 of the present embodiment receives the first configuration device 200 according to test request
The polarity of output instructs, and the output end 112 of the first digital analog converter 110 exports first voltage or second voltage.Second digital-to-analogue turns
The input terminal 121 of parallel operation 120 receives the second configuration device 300 and is instructed according to the gray level information that test request exports, the second digital-to-analogue
The output end 122 of converter 120 exports grayscale alternating voltage.The first input end 131 and the first digital-to-analogue of operation conversion module 130
The output end 112 of converter 110 is connected, the second input terminal 132 of operation conversion module 130 and the second digital analog converter 120
Output end 122 is connected, and according to first voltage or second voltage, the output of output end 133 of operation conversion module 130 meets test and wants
The polarity driven voltage asked.For example, voltage conversion circuit when test needs to switch to bipolar voltage, can pass through the first number
Mode converter 110 receives the first configuration device 200 and is instructed according to the polarity that test request exports, and exports corresponding first voltage
Such as 12V, the second digital analog converter 120 receive the second configuration device 300 and are instructed according to the gray level information that test request exports, and
The grayscale alternating voltage in fixed voltage range such as 0V~12V is exported, operation conversion module 130 receives first voltage and grayscale
Alternating voltage simultaneously exports the polarity driven voltage for meeting the bipolar voltage (such as voltage range is in -6V~6V) of test request；
And voltage conversion circuit is when test needs to switch to positive polarity voltage, and the can be received by the first digital analog converter 110
One configuration device 200 is instructed according to the polarity that test request exports, and exports corresponding second voltage such as 0V, and the second digital-to-analogue turns
Parallel operation 120 receives the second configuration device 300 and is instructed according to the gray level information that test request exports, and exports fixed voltage range example
Such as the grayscale alternating voltage in 0V~12V, operation conversion module 130 receives second voltage and grayscale alternating voltage and exports satisfaction
The polarity driven voltage of the positive polarity voltage (such as voltage range is 0V~12V) of test request.Therefore, turned by the first digital-to-analogue
Parallel operation 110 receives the first configuration device 200 and is instructed according to the polarity that test request exports, and exports the first digital analog converter 110
Corresponding first voltage or second voltage, so that it may so that output meets the positive/negative-pressure pole of test request on operation conversion module 130
The polarity driven voltage of property voltage.Moreover, when the voltage conversion circuit of the present embodiment switches positive/negative-pressure polarity test, without change
Resistance on circuit board, improves testing efficiency.
Technical solution bring beneficial effect provided in an embodiment of the present invention is：
Voltage conversion circuit provided in this embodiment, by operation conversion module 130 respectively with the first digital analog converter
110, the second digital analog converter 120 is connected, and receives the first configuration device 200 according to the first digital analog converter 110 and is wanted according to test
It asks the polarity of output to instruct, so that the first digital analog converter 110 is exported corresponding first voltage or second voltage, so that it may so that operation
Output meets the polarity driven voltage of the positive/negative-pressure polar voltages of test request on conversion module 130, so that voltage conversion circuit
Positive/negative-pressure polarity can be switched, and without changing resistance on circuit board, improve testing efficiency.
Referring to FIG. 2, Fig. 2 is the circuit structure diagram of the voltage conversion circuit of one embodiment of the invention.Electricity as shown in Figure 2
The circuit structure diagram of voltage conversion circuit and the structure of the circuit diagram of voltage conversion circuit as shown in Figure 1 are essentially identical, fortune
It calculates conversion module 130 and includes first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4 and operational amplifier U1, the
The first end of one resistance R1 is connected with the output end 112 of the first digital analog converter 110, and second end and the operation of first resistor R1 is put
The inverting input terminal of big device U1 is connected, and the first end of second resistance R2 is connected with the inverting input terminal of operational amplifier U1, and second
The second end of resistance R2 is connected with the output end of operational amplifier U1, the first end of 3rd resistor R3 and the second digital analog converter
120 output end 122 is connected, and the second end of 3rd resistor R3 is connected with the normal phase input end of operational amplifier U1, the 4th resistance
The first end of R4 is connected with the normal phase input end of operational amplifier U1, the second end ground connection of the 4th resistance R4.
In an embodiment of the present invention, voltage conversion circuit includes voltage follower 140, as shown in Fig. 2, voltage follow
The input terminal 141 of device 140 is the normal phase input end of voltage follower 140, is connected with the output end 132 of operation conversion module 130,
The inverting input terminal of voltage follower 140 can be connected with the output end 142 of voltage follower 140, drive for exporting with polarity
The dynamic identical voltage of voltage, enhances the driving capability of circuit.
In an embodiment of the present invention, the resistance value of first resistor R1 can be n times of the resistance value of second resistance R2, and the 4th
The resistance value of resistance R4 can be n times of the resistance value of 3rd resistor R3.Further, in one embodiment, first resistor R1
Resistance value can be twice of the resistance value of second resistance R2, and the resistance value of the 4th resistance R4 can be the two of the resistance value of 3rd resistor R3
Times.
Specifically, as shown in Fig. 2, the first configuration device 200 of the first digital analog converter 110 reception is exported according to test request
Polarity instruction, allow 110 output voltage VA of the first digital analog converter be first voltage or second voltage, the second digital-to-analogue conversion
Device 120 receives the second configuration device 300 and is instructed according to the gray level information that test request exports, and exports grayscale alternating voltage VB,
Second digital analog converter 120 is grounded by concatenated 3rd resistor R3 and the 4th resistance R4, and the input of operational amplifier U1 is electric
Stream is zero, then the normal phase input end voltage VD of operational amplifier U1 can be grayscale alternating voltage VB in 3rd resistor R3, the 4th
Voltage after resistance R4 partial pressure.First digital analog converter 110 connects operation with second resistance R2 by concatenated first resistor R1
The output end of amplifier U1, and the input current of operational amplifier U1 is zero, then basis flows through resistance R1 and flows through resistance R2's
Electric current is equal, and the output end voltage VE that operational amplifier U1 can be obtained can be voltage VA and pass through first resistor R1, the in electric current
Voltage after two resistance R2.And the voltage VD phase on the voltage VC and normal phase input end of the inverting input terminal of operational amplifier U1
Deng, then the voltage VC in the inverting input terminal of operational amplifier U1 can for grayscale alternating voltage VB in 3rd resistor R3, the 4th
Voltage after resistance R4 partial pressure.That is, on circuit of the electric current by concatenated first resistor R1 and second resistance R2, the
The both ends of one resistance R1 are voltage VA and voltage VC respectively, and VC is voltage related with grayscale alternating voltage VB, then can make
Polarity driven voltage VE on two one end resistance R2 is a voltage related with voltage VA and grayscale alternating voltage VB.Therefore,
The first configuration device 200 is received by the first digital analog converter 110 to be instructed according to the polarity that test request exports, and makes the first digital-to-analogue
110 output voltage VA of converter is corresponding first voltage or second voltage, so that it may change and export on operation conversion module 130
The corresponding voltage range of polarity driven voltage VE, so that voltage range is needed the test of voltage when switching positive/negative-pressure polarity test
Range.Therefore, when the voltage conversion circuit of the present embodiment switches positive/negative-pressure polarity test, it is only necessary to which the first digital analog converter 110 connects
It receives the polarity that the first configuration device 200 is exported according to test request to instruct, makes 110 output voltage VA of the first digital analog converter the
One voltage or second voltage improve testing efficiency without changing resistance on circuit board.
Further, the resistance value of first resistor R1 can be n times of the resistance value of second resistance R2, the resistance value of the 4th resistance R4
It can be n times of the resistance value of 3rd resistor R3.Then the normal phase input end voltage VD of operational amplifier U1 is grayscale alternating voltage VB
Voltage after 3rd resistor R3, the 4th resistance R4 partial pressure, i.e. VD=n/ (n+1) VB, the inverting input terminal of operational amplifier U1
Voltage VC and normal phase input end on voltage VD it is equal, i.e. VC=VD=n/ (n+1) VB, and according to flowing through resistance R1 and flow through
The electric current of resistance R2 is equal, and (VA-VC)/n=VC-VE can be obtained, then polarity driven voltage VE=VB-VA/n can be obtained by substituting into.Its
In, grayscale alternating voltage VB is to maintain output fixed voltage range, then can be by changing voltage VA value, to change polarity driven
The voltage range of voltage VE, and then the test scope that voltage is needed when switching positive/negative-pressure polarity test can be obtained.The present embodiment
Voltage conversion circuit, can be seen that from obtained VE=VB-VA/n can receive the first configuration by the first digital analog converter 110
Device 200 is instructed according to the polarity that test request exports, and changes the voltage value of 110 output voltage VA of the first digital analog converter,
Polarity driven voltage range, and the two voltage ranges can be obtained on the basis of the voltage range of grayscale alternating voltage VB
Maxima and minima difference it is equal.
Further, when twice that the resistance value of first resistor R1 is the resistance value of second resistance R2, the resistance value of the 4th resistance R4
When being twice of the resistance value of 3rd resistor R3, polarity driven voltage VE=VB-VA/2 can be obtained.Such as voltage conversion circuit is being surveyed
When examination needs to switch bipolar voltage, the first configuration device 200 can be received by the first digital analog converter 110 and be wanted according to test
It asks the polarity of output to instruct, makes 110 output voltage VA first voltage such as 12V of the first digital analog converter, the second digital-to-analogue conversion
Device 120 receives the second configuration device 300 and is instructed according to the gray level information that test request exports, and exports in fixed range such as 0V
Grayscale alternating voltage VB in~12V, so that the polarity driven voltage VE=VB-VA/2 exported on operation conversion module 130, then
The voltage range of polarity driven voltage is -6V~6V, for the test scope for needing voltage when switching bipolarity test；And in voltage
Conversion circuit can receive the first configuration device by the first digital analog converter 110 when test needs to switch positive polarity voltage
200 instruct according to the polarity of test request output, make 110 output voltage VA second voltage such as 0V of the first digital analog converter,
Second digital analog converter 120 receives the second configuration device 300 and is instructed according to the gray level information that test request exports, and exports solid
The grayscale alternating voltage VB in range such as 0V~12V is determined, so that the polarity driven voltage VE exported on operation conversion module 130
=VB-VA/2, the i.e. voltage range of polarity driven voltage are 0V~12V, for the test for needing voltage when switching positive polarity test
Range.
The resistance value of first resistor R1 of the invention is not limited to be twice of the resistance value of second resistance R2, the 4th resistance R4's
Resistance value is not limited to be twice of the resistance value of 3rd resistor R3, and in one embodiment, the resistance value of first resistor R1 can also be
One times of the resistance value of two resistance R2, the resistance value of the 4th resistance R4 can also be one times etc. of the resistance value of 3rd resistor R3.
In an embodiment of the present invention, the voltage of the first digital analog converter 110 output can be with the second digital analog converter
The minimum value or maximum value of the grayscale alternating voltage of 120 outputs are identical, but the present invention is not limited thereto, such as the first digital-to-analogue turns
The voltage that parallel operation 110 exports can be twice etc. of the maximum value of grayscale alternating voltage, as long as making on operation conversion module 130
The voltage range of the polarity driven voltage of output needs the test scope of voltage when being switching positive/negative-pressure polarity test be then this
The protection scope of application.
In an embodiment of the present invention, the first digital analog converter 110 can be same with the second digital analog converter 120
Device.When the first voltage of the first digital analog converter 110 output or the voltage value of second voltage are defeated in the second digital analog converter 120
When out in the voltage range of grayscale alternating voltage VB, the first digital analog converter 110 can be same with the second digital analog converter 120
Kind device.
Technical solution bring beneficial effect provided in an embodiment of the present invention is：
Voltage conversion circuit provided in this embodiment, operation conversion module 130 include first resistor R1 to the 4th resistance R4
With operational amplifier U1, the first digital analog converter 110 is received into the first configuration device 200 and is referred to according to the polarity that test request exports
It enables, makes 110 output voltage VA first voltage of the first digital analog converter or second voltage, polarity driven voltage VE can be made corresponding
Voltage range be to need the test scope of voltage when switching positive/negative-pressure polarity test, voltage conversion circuit is switched positive and negative
Polarity is pressed, and without changing resistance on circuit board, improves testing efficiency.
Referring to FIG. 3, Fig. 3 is the circuit diagram of the lighting test device of one embodiment of the invention.As shown in figure 3, point
Test device includes DAC processing module 100, and DAC processing module 100 includes the voltage conversion circuit of above-described embodiment.Into one
Step ground, lighting test device further includes the first configuration device 200 and signal generator module 400.First configuration device 200 is according to matching
Confidence ceases output polarity instruction.Signal generator module 400 is the second configuration device 300, and signal generator module 400 refers to according to configuration
Output direct voltage drive signal, gate drive signal and bus signals are enabled, test panel 500 receives direct voltage drive signal
And gate drive signal.DAC processing module 100 connects the first configuration device 200 and signal generator module 400, receives first and matches
The polarity instruction of the output of device 200 is set, and obtains gray level information instruction according to the bus signals that signal generator module 400 exports,
DAC processing module 100 exports source electrode driving signal to test panel 500.The lighting test device of the present embodiment can be according to matching
It sets parameter and exports corresponding driving signal to test panel 500, carry out corresponding lighting to control test panel 500, thus real
Present line debug point test device.
Specifically, the present embodiment can be in the first configuration device 200, according to test request and by operation interface to matching
Parameter is set to be configured and change.When test needs corresponding positive-negative polarity voltage, can be carried out in the first configuration device 200
Correlation setting makes the first configuration device 200 export corresponding polarity instruction, so that test device output test in control point needs
Polar voltages realize switching positive/negative-pressure polarity, and without change and by the voltage conversion circuit in DAC processing module 100
Resistance on circuit board, improves testing efficiency, does not need professional's programming program again, makes the output test of lighting test device
The driving signal needed, greatly improves test and debugging efficiency.
In an embodiment of the present invention, the first configuration device 200 is connect with SD card, for reading or saving with confidence
Breath, the first configuration device 200 can read or save configuration information from SD card.
Technical solution bring beneficial effect provided in an embodiment of the present invention is：
Lighting test device provided in this embodiment can switch positive/negative-pressure polarity, and without changing the resistance on circuit board,
Professional's programming program again is not needed, the driving signal for needing the output test of lighting test device greatly improves
Test and debugging efficiency.
Referring to FIG. 4, Fig. 4 is the circuit diagram of the lighting test device of another embodiment of the present invention.As shown in figure 4,
Lighting test device includes host computer 600, signal generator module 400 and DAC processing module 100.Host computer 600 is according to confidence
Breath output configuration-direct.Signal generator module 400 connect host computer 600, according to configuration-direct export direct voltage drive signal,
Gate drive signal and bus signals, test panel 500 receive direct voltage drive signal and gate drive signal.DAC processing
Voltage conversion circuit of the module 100 including an above-mentioned embodiment, 100 connection signal generation module 400 of DAC processing module, according to
The bus signals that signal generator module 400 exports obtain polarity instruction and gray level information instruction, and export source electrode driving signal and arrive
Test panel 500.
In an embodiment of the present invention, bus signals can be, but not limited to include I2C signal or SPI signal, for example,
Bus signals may include I2C signal can then pass through this two bus lines of serial data line SDA and serial time clock line SCL
The first digital analog converter 110 and the second digital analog converter 120 of voltage conversion circuit in DAC processing module 100 are connected, to provide
Polarity instruction and gray level information instruction.
Specifically, the lighting test device of the present embodiment, host computer 600 export configuration-direct, signal according to configuration information
Generation module 400 receives the configuration-direct that host computer 600 exports and exports corresponding direct voltage drive signal, gate driving letter
Number and bus signals, DAC processing module 100 receive signal generator module 400 export bus signals.Wherein, DAC processing module
100 include the voltage conversion circuit of above-described embodiment, and the bus signals that signal generator module 400 exports include polarity instruction and ash
Rank information command.Then the first digital analog converter 110 in voltage conversion circuit can receive polarity and instruct and generate first voltage
Or second voltage, the second digital analog converter 120 can receive gray level information and instruct and export grayscale alternating voltage, operation modulus of conversion
The polarity driven voltage according to needed for first voltage or second voltage output positive/negative-pressure polarity test of block 130, polarity driven electricity
Pressure can be used as a voltage signal in source drive signal, thus, DAC processing module 100 exports source electrode driving signal, surveys
Examination panel 500 carries out lighting after receiving direct voltage drive signal, gate drive signal and source drive signal.The present embodiment
Lighting test device can realize switching positive/negative-pressure polarity, and be not necessarily to by the voltage conversion circuit in DAC processing module 100
Resistance on circuit board is changed, testing efficiency is improved.
In an embodiment of the present invention, configuration information may include resolution ratio, refresh rate and source pole driving mode etc., i.e.,
Configuration parameter is not limited to direct voltage drive signal, gate drive signal and source drive signal, or resolution ratio, brush
New rate, source pole driving mode etc..
The present embodiment can according to test request, configuration parameter is configured by the operation interface of host computer 600 and
Change, in an embodiment of the present invention, host computer 600 is connect with SD card, for reading or saving configuration information, host computer
600 can read or save configuration information from SD card.
Specifically, host computer 600 can run human-computer interaction interface software, and configuration parameter is arranged as differentiated by interface
The configuration parameters such as rate, refresh rate, driving DC voltage, source pole driving mode, source drive voltage, gate drive voltage, lighting
Test device can export corresponding driving signal to test panel 500, to control the progress of test panel 500 according to configuration parameter
Corresponding lighting.It can also be connect by serial ports with lighting test device, realize on-line debugging lighting test device.
Technical solution bring beneficial effect provided in an embodiment of the present invention is：
Lighting test device provided in this embodiment can switch positive/negative-pressure polarity, and without changing the resistance on circuit board,
Configuration information (such as source drive voltage, driving DC voltage and gate drive voltage) also is changed using host computer 600, no
Professional's programming program again is needed, the driving signal for needing the output test of lighting test device greatly improves survey
Examination and debugging efficiency.
The above described is only a preferred embodiment of the present invention, be not intended to limit the present invention in any form, though
So the present invention has been disclosed as a preferred embodiment, however is not limited to invent, any person skilled in the art,
It is not departing within the scope of inventive technique scheme, when the technology contents using the disclosure above make a little change or are modified to equivalent
The equivalent embodiment of variation, but it is all without departing from inventive technique scheme content, and the technical spirit according to invention is to above embodiments
Made any simple modification, equivalent change and modification, all of which are still within the scope of the technical scheme of the invention.
Claims (10)
1. a kind of voltage conversion circuit, which is characterized in that including
The input terminal (111) of first digital analog converter (110), first digital analog converter (110) receives the first configuration device
(200) it is instructed according to the polarity of test request output, output end (112) output first of first digital analog converter (110)
Voltage or second voltage；
The input terminal (121) of second digital analog converter (120), second digital analog converter (120) receives the second configuration device
(300) it is instructed according to the gray level information of test request output, output end (122) output of second digital analog converter (120)
Grayscale alternating voltage；
Operation conversion module (130), the first input end (131) of the operation conversion module (130) and first digital-to-analogue turn
The output end (112) of parallel operation (110) is connected, the second input terminal (132) of the operation conversion module (130) and second number
The output end (122) of mode converter (120) is connected, according to the first voltage or the second voltage, the operation modulus of conversion
Output end (133) output of block (130) meets the polarity driven voltage of the test request.
2. voltage conversion circuit as described in claim 1, which is characterized in that the voltage conversion circuit includes voltage follower
(140), the output end of the normal phase input end (141) of the voltage follower (140) and the operation conversion module (130)
(133) it is connected, the inverting input terminal and output end (142) phase of the voltage follower (140) of the voltage follower (140)
Even.
3. voltage conversion circuit as claimed in claim 1 or 2, which is characterized in that the operation conversion module (130) includes the
One resistance (R1), second resistance (R2), 3rd resistor (R3), the 4th resistance (R4) and operational amplifier (U1), first electricity
The first end of resistance (R1) is connected with the first input end (131) of the operation conversion module (130), the first resistor (R1)
Second end is connected with the inverting input terminal of the operational amplifier (U1), the first end and the operation of the second resistance (R2)
The inverting input terminal of amplifier (U1) is connected, the second end of the second resistance (R2) and the output of the operational amplifier (U1)
End is connected, the second input terminal (132) phase of the first end of the 3rd resistor (R3) and the operation conversion module (130)
Even, the second end of the 3rd resistor (R3) is connected with the normal phase input end of the operational amplifier (U1), the 4th resistance
(R4) first end is connected with the normal phase input end of the operational amplifier (U1), the second termination of the 4th resistance (R4)
Ground.
4. voltage conversion circuit as claimed in claim 3, which is characterized in that the resistance value of the first resistor (R1) is described
N times of the resistance value of two resistance (R2), the resistance value of the 4th resistance (R4) are n times of the resistance value of the 3rd resistor (R3).
5. voltage conversion circuit as described in claim 1, which is characterized in that first digital analog converter (110) with it is described
Second digital analog converter (120) is same device.
6. a kind of lighting test device, which is characterized in that the lighting test device includes DAC processing module (100), described
DAC processing module (100) includes voltage conversion circuit described in any one of claims 1 to 5.
7. lighting test device as claimed in claim 6, which is characterized in that the lighting test device further includes
Host computer (600), the host computer (600) export configuration-direct according to configuration information；
Signal generator module (400), the signal generator module (400) are handled with the host computer (600) and the DAC respectively
Module (100) is connected, and the signal generator module (400) includes first configuration device (200) and the second configuration dress
It sets (300), the signal generator module (400) exports direct voltage drive signal according to the configuration-direct, gate driving is believed
Number and bus signals, test panel (500) receive the direct voltage drive signal and the gate drive signal；
Wherein, the DAC processing module (100) obtains the polarity instruction according to the bus signals and the gray level information refers to
It enables, and exports source electrode driving signal to the test panel (500).
8. lighting test device as claimed in claim 7, which is characterized in that the host computer (600) connect with SD card, is used for
Read or save the configuration information.
9. lighting test device as claimed in claim 7, which is characterized in that the bus signals include I2C signal or SPI
Signal.
10. lighting test device as claimed in claim 7, which is characterized in that the configuration information includes resolution ratio, refresh rate
And source pole driving mode.
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| CN201810200310.6A CN108933590B (en) | 2018-03-12 | 2018-03-12 | Voltage conversion circuit and lighting test device |
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| CN201810200310.6A CN108933590B (en) | 2018-03-12 | 2018-03-12 | Voltage conversion circuit and lighting test device |
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| CN108933590B CN108933590B (en) | 2022-04-22 |
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| CN108933590B (en) | 2022-04-22 |
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