CN109509447A - Common voltage integrated circuit and display device - Google Patents
Common voltage integrated circuit and display device Download PDFInfo
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- CN109509447A CN109509447A CN201811559902.3A CN201811559902A CN109509447A CN 109509447 A CN109509447 A CN 109509447A CN 201811559902 A CN201811559902 A CN 201811559902A CN 109509447 A CN109509447 A CN 109509447A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 75
- 230000015654 memory Effects 0.000 claims abstract description 23
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- 238000012545 processing Methods 0.000 claims description 11
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 7
- 230000014759 maintenance of location Effects 0.000 abstract description 6
- 239000004973 liquid crystal related substance Substances 0.000 description 16
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0257—Reduction of after-image effects
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Abstract
The invention discloses a public voltage integrated circuit and a display device, wherein the circuit comprises: a common voltage output terminal; a memory configured to store and output a digital common voltage; the signal conversion module is used for receiving the digital public voltage, converting the digital public voltage into an analog first public voltage and outputting the analog first public voltage; the signal amplifier is used for amplifying the analog first common voltage, converting the analog first common voltage into a second common voltage and outputting the second common voltage to the common voltage output end; and the common voltage compensation module is used for generating compensation voltage according to the first common voltage and the second common voltage, converting the compensation voltage into digital compensation voltage and feeding the digital compensation voltage back to the signal conversion module so that the signal conversion module updates and simulates the first common voltage according to the digital compensation voltage and the digital common voltage and outputs the first common voltage. The invention realizes stable public voltage generation, solves the problems of image retention, gray scale display abnormity or crosstalk of the display panel caused by public voltage offset, and improves the display effect of the display device.
Description
Technical field
The present invention relates to integrated technology field, in particular to a kind of common voltage integrated circuit and display device.
Background technique
During display device work, display device is using pixel electrode, public electrode to liquid crystal sandwiched therebetween
Layer one driving voltage of application is poor, so that the liquid crystal molecule of liquid crystal layer in display panel be made to rotate.
Currently, common voltage is provided by common voltage integrated circuit mostly, it, will due to the presence of IC interior impedance
Common voltage is caused to shift.
Summary of the invention
The main object of the present invention is to propose a kind of common voltage integrated circuit and display device, it is intended to stable common electrical
Pressure generates, and solving the problems, such as to deviate because of common voltage causes display panel image retention, grayscale display exception or cross-talk occur, improves
The display effect of display device.
To achieve the above object, the present invention proposes a kind of common voltage integrated circuit, the common voltage integrated circuit packet
It includes:
Common voltage output end；
Memory is set as storing digital common voltage, and exports；
Signal conversion module is set as receiving the digital common voltage, and the digital common voltage is converted to mould
It is exported after quasi- first common voltage；
Signal amplifier is set as the first common voltage of the simulation amplifying processing, public to be converted to second
Voltage, and export to the common voltage output end；
Common voltage compensating module is set as generating compensation electricity according to first common voltage and the second common voltage
Pressure, and the signal conversion module is fed back to after being converted to digital compensation voltage, so that the signal conversion module is according to
Digital compensation voltage and digital common voltage, update the first common voltage of the simulation and export.
Optionally, the common voltage compensating module includes that signal comparing unit, modulus signal converting unit and signal are raw
At unit；
The signal comparing unit includes the first signal input part and second signal input terminal, the signal comparing unit
First signal input part is connect with the output end of the signal conversion module, the second signal input terminal of the signal comparing unit
It is connect with the common voltage output end, the input of the output end of the signal comparing unit and the modulus signal converting unit
End connection；The output end of the modulus signal converting unit is connect with the signal conversion module.
Optionally, the signal comparing unit include operational amplifier, first partial pressure subelement, second partial pressure subelement,
The input terminal of the first partial pressure subelement is the first signal input part of the signal comparing unit, and the first partial pressure is single
The output end of member is connect with the normal phase input end of the operational amplifier, and the input terminal of the second partial pressure subelement is the letter
The reverse phase of the second signal input terminal of number comparing unit, the output end and the operational amplifier of the second partial pressure subelement is defeated
Enter end connection, the output end of the operational amplifier is the output end of the signal comparing unit.
Optionally, the first partial pressure subelement includes first resistor and second resistance, the first end of the first resistor
For the input terminal of the first partial pressure subelement, the second end of the first resistor is grounded through the second resistance, and described first
The common end of resistance and the second resistance is the output end of the first partial pressure subelement.
Optionally, the resistance value of the first resistor and the second resistance is equal.
Optionally, the second partial pressure subelement includes 3rd resistor and the 4th resistance, the first end of the 3rd resistor
For the input terminal of the second partial pressure subelement, the second end of the 3rd resistor and the 4th resistance first end and the fortune
Calculate the inverting input terminal interconnection of amplifier；The second end of 4th resistance is connect with the output end of the operational amplifier.
Optionally, the conversion module includes adder and D/A conversion unit, the first input end of the adder with
Memory connection, the second input terminal of the adder are the voltage compensation module, the output end of the adder with
The input terminal of the D/A conversion unit connects, and the output end of the digital-to-analogue conversion unit is connect with the signal amplifier.
Optionally, the signal amplifier is current signal amplifier.
Also a kind of common voltage integrated circuit of the present invention, the common voltage integrated circuit include:
Common voltage output end；
Memory is set as storing digital common voltage, and exports；
Signal conversion module is set as receiving the digital common voltage, and the digital common voltage is converted to mould
It is exported after quasi- first common voltage；
Signal amplifier is set as the first common voltage of the simulation amplifying processing, public to be converted to second
Voltage, and export to the common voltage output end；
Common voltage compensating module is set as generating compensation electricity according to first common voltage and the second common voltage
Pressure, and the signal conversion module is fed back to after being converted to digital compensation voltage, so that the signal conversion module is according to
Digital compensation voltage and digital common voltage, update the first common voltage of the simulation and export；
The common voltage compensating module:
Including signal comparing unit, modulus signal converting unit and signal generation unit；
The signal comparing unit includes the first signal input part and second signal input terminal, the signal comparing unit
First signal input part is connect with the output end of the signal conversion module, the second signal input terminal of the signal comparing unit
It is connect with the common voltage output end, the input of the output end of the signal comparing unit and the modulus signal converting unit
End connection；
The conversion module includes adder and D/A conversion unit, the first input end of the adder and the storage
Device connection, the second input terminal of the adder are that the output end of the modulus signal converting unit connects, the adder
Output end is connect with the input terminal of the D/A conversion unit, the output end and the signal amplifier of the digital-to-analogue conversion unit
Connection.
The present invention also proposes that a kind of display device, the display device include:
Display panel, including common voltage input terminal, multi-strip scanning line and multiple data lines；
Source electrode driver, multiple output ends are connect one by one with the multiple data lines of the display panel；
Gate drivers, multiple output ends are connect one by one with the multi-strip scanning line of the display panel；
And common voltage integrated circuit as described above, the output end of the common voltage integrated circuit and the display
The common voltage input terminal of panel connects.
Common voltage integrated circuit of the present invention is being shown by setting memory, signal conversion module and signal amplifier
After showing device works on power, the digital common voltage of memory storage is read by signal conversion module, and the number is public
Voltage is converted to after simulation common voltage namely the first common voltage output to signal amplifier, and signal amplifier is by common electrical
After pressure carries out signal enhanced processing, export to the public electrode of display panel, to provide common voltage, this hair for display panel
It is bright to be additionally provided with voltage compensation module, offset voltage is generated according to the first common voltage and the second common voltage, and be converted to number
The signal conversion module is fed back to after word offset voltage so that the signal conversion module according to the digital compensation voltage and
Digital common voltage updates the first common voltage of the simulation and exports.The present invention realizes stable common voltage and generates, solution
It has determined because of the problem of common voltage offset causes display panel image retention occur, grayscale shows exception or cross-talk, has improved display
The display effect of device.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the functional block diagram of one embodiment of common voltage integrated circuit of the present invention；
Fig. 2 is the circuit diagram of one embodiment of common voltage integrated circuit of the present invention；
Fig. 3 is common voltage Application of integrated circuit of the present invention in the structural schematic diagram of one embodiment of display device.
Drawing reference numeral explanation:
| Label | Title | Label | Title |
| 10 | Memory | 411 | First partial pressure subelement |
| 20 | Signal conversion module | 412 | Second partial pressure subelement |
| 30 | Signal amplifier | R1~R5 | First resistor~the 5th resistance |
| 40 | Common voltage compensating module | Vcom | Common voltage output end |
| 41 | Signal comparing unit | OP1 | Operational amplifier |
| 42 | Modulus signal converting unit | 22 | Digital and analogue signals converting unit |
| 21 | Adder | 400 | Sequence controller |
| 100 | Gate drivers | 500 | Driving power |
| 200 | Display panel | 600 | Common voltage integrated circuit |
| 300 | Source electrode driver |
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
His embodiment, shall fall within the protection scope of the present invention.
It is to be appreciated that if relating to directionality instruction (such as up, down, left, right, before and after ...) in the embodiment of the present invention,
Then directionality instruction be only used for explain under a certain particular pose (as shown in the picture) between each component relative positional relationship,
Motion conditions etc., if the particular pose changes, directionality instruction is also correspondingly changed correspondingly.
In addition, being somebody's turn to do " first ", " second " etc. if relating to the description of " first ", " second " etc. in the embodiment of the present invention
Description be used for description purposes only, be not understood to indicate or imply its relative importance or implicitly indicate indicated skill
The quantity of art feature." first " is defined as a result, the feature of " second " can explicitly or implicitly include at least one spy
Sign.It in addition, the technical solution between each embodiment can be combined with each other, but must be with those of ordinary skill in the art's energy
It is enough realize based on, will be understood that the knot of this technical solution when conflicting or cannot achieve when occurs in the combination of technical solution
Conjunction is not present, also not the present invention claims protection scope within.
The present invention proposes a kind of common voltage integrated circuit (VCOMIC), is suitable for television set, mobile phone, computer etc. with aobvious
Show in the display device of panel.
The present invention proposes a kind of common voltage integrated circuit, has display panel suitable for television set, mobile phone, computer etc.
In display device, display device is provided with display panel, source electrode driver or data driver and gate drivers.
Referring to FIG. 1 and FIG. 2, in an embodiment of the present invention, which includes:
Common voltage output end Vcom；
Memory 10 is set as storing digital common voltage, and exports；
Signal conversion module 20 is set as receiving the digital common voltage, and the digital common voltage is converted to
It is exported after simulating the first common voltage；
Signal amplifier 30 is set as the first common voltage of the simulation amplifying processing, to be converted to the second public affairs
Common voltage, and export to the common voltage output end Vcom；
Common voltage compensating module 40 is set as generating compensation electricity according to first common voltage and the second common voltage
Pressure, and the signal conversion module 20 is fed back to after being converted to digital compensation voltage, so that 20 basis of the signal conversion module
The digital compensation voltage and digital common voltage, update the first common voltage of the simulation and export.
In the present embodiment, memory 10 can be using memories 10 such as erasable memory 10, flash memories 10 come real
Existing, memory 10 can be by communication interface and communicating circuit and host computer communication connection, and stores the storage of host computer output
Digital common voltage.
The data that memory 10 stores are mostly digital signal, and display panel is driven to analog signal, the present embodiment
In, signal conversion module 20 can be realized using AD conversion module, and digital common voltage is converted to simulation common voltage.
In order to improve the common voltage of output to the driving capability of the liquid crystal molecule of display panel, the present embodiment is additionally provided with
The signal amplifier 30 that signal amplifier 30 amplifies public voltage signal.In this implementation, signal amplifier 30 can be set
It is set to current signal amplifier 30.
It is understood that the liquid crystal molecule in display panel changes its positional relationship by voltage, in liquid crystal polarity
When reverse drive, the voltage signal that a positive and negative anodes change can be applied to liquid crystal molecule and realize that the exchange of liquid crystal molecule drives.And
Applying alive to liquid crystal molecule is voltage on sub-pixel capacitor, the public electrode of one end connection display panel of the capacitor.
Common voltage in display panel is the reference voltage of LCD alternating-current driving, and the generation circuit of general common voltage is by display surface
Power management integrated circuit in plate export an AVDD as one of input source it is adjustable be that resistor network is added one and mentioned
The voltage follow-up amplifier of high voltage drive ability is constituted, and the generation circuit of common voltage is exported after generating common voltage to aobvious
Show the public electrode of panel, which can be the fixed value remained unchanged.
With the development of science and technology and the integrated level of display device increase, common voltage increasingly come by public
Voltage integrated circuit is debugged to provide, namely to liquid crystal display panel, and after determining common voltage, passes through host computer and program
Digital common voltage is stored in common voltage integrated circuit by burning interface.On the display apparatus after electricity work, common voltage
After the number common voltage is carried out signal conversion and enhanced processing by integrated circuit, output simulation common voltage to display panel
Public electrode, namely export a pole to display panel sub-pixel capacitor namely pixel electrode, display panel sub-pixel it is another
Pole tension is then provided by the data driver of display device, and the voltage of data driver output and the voltage difference of public electrode are
Deflection is realized for driving liquid crystal molecule.
It should be noted that display device is using pixel electrode, public electrode to folder during display device work
Liquid crystal layer one driving voltage of application therebetween is poor, to make the liquid crystal molecule of liquid crystal layer in display panel rotate, in turn
The throughput that backlight electric power in control display device emits beam is to show picture.Driving voltage difference be pixel electrode voltage with
It is added in for the pressure difference of current potential (common voltage) of public electrode, therefore, driving display needs stable public electric moter voltage,
Namely common voltage must remain unchanged, public electrode once changes, it is likely that realizes that image retention, display ash occurs in display panel
Phenomena such as rank exception and cross-talk, influence display effect.
However, the resolution with display panel is higher and higher, size is increasing, and it is more next that the electric current of public electrode takes out load
Bigger, due to the presence of common voltage IC interior impedance, so that common voltage declines, especially electric current is bigger, public
Voltage decline is then more serious.Furthermore the array layer (array) that common voltage also suffers from display panel influences, wherein array layer
It (array) is the data that picture is shown for transmitting, as the picture of display is different, common voltage also has different offset shapes
Condition occurs.
To solve the above-mentioned problems, the present embodiment passes through setting common voltage compensating module 40, common voltage complementary modulus block packet
First input end and the second input terminal are included, the first input end of common voltage compensating module 40 is connect with signal conversion module 20,
Its second input terminal is connect with common voltage output end Vcom, to detect the common electrical before and after common voltage output end Vcom respectively
Pressure namely the first common voltage, are equivalent to original common voltage and the second common voltage, carry out electric current through signal amplifier 30
The common voltage of signal enhanced processing.Second common voltage is after common voltage IC interior impedance is divided, and second
Common voltage value is less than the first common voltage value.This implementation common voltage compensating module 40 is public according to the first common voltage and second
Common voltage generates offset voltage, which is the difference between the first common voltage and the second common voltage.
Common voltage integrated circuit of the present invention passes through setting memory 10, signal conversion module 20 and signal amplifier 30,
And on the display apparatus after electricity work, the digital common voltage that memory 10 stores is read by signal conversion module 20, and will
To signal amplifier 30, signal is put for output after the number common voltage is converted to simulation common voltage namely the first common voltage
After common voltage is carried out signal enhanced processing by big device 30, export to the public electrode of display panel, to be mentioned for display panel
For common voltage, the present invention is additionally provided with common voltage compensating module 40, is produced according to the first common voltage and the second common voltage
Raw offset voltage, and the signal conversion module 20 is fed back to after being converted to digital compensation voltage, so that the signal modulus of conversion
Block 20 updates the first common voltage of the simulation and exports according to the digital compensation voltage and digital common voltage.The present invention
Stable common voltage is realized to generate, solve because common voltage offset causes display panel image retention occur, grayscale show it is different
The problem of normal or cross-talk, improve the display effect of display device.
Referring to FIG. 1 and FIG. 2, in an alternative embodiment, the common voltage compensating module 40 includes signal comparing unit
41 and modulus signal converting unit 42；
The signal comparing unit 41 includes the first signal input part and second signal input terminal, the signal comparing unit
41 the first signal input part is connect with the output end of the signal conversion module 20, the second letter of the signal comparing unit 41
Number input terminal is connect with the common voltage output end Vcom, the output end of the signal comparing unit 41 and the modulus signal
The input terminal of converting unit 42 connects；The output end of the modulus signal converting unit 42 and the signal conversion module 20 connect
It connects.
In the present embodiment, signal comparing unit 41 be arranged two signal input parts respectively with signal conversion module 20 and public affairs
Common voltage output end Vcom connection, to detect the first common voltage and common voltage output end of the output of signal conversion module 20
Second common voltage of Vcom output, and the first common voltage that will test is compared with the second common voltage, Huo Zhejin
Row difference calculates, and obtains corresponding offset voltage according to comparison result, and the analog compensation voltage is through modulus signal converting unit
42 be converted to digital compensation voltage after export.
Referring to FIG. 1 and FIG. 2, in above-described embodiment, the signal comparing unit 41 includes operational amplifier OP1, first point
Subelement 411, second is pressed to divide subelement 412, the input terminal of the first partial pressure subelement 411 is the signal comparing unit
41 the first signal input part, the output end of the first partial pressure subelement 411 and the positive of the operational amplifier OP1 input
The input terminal of end connection, the second partial pressure subelement 412 is the second signal input terminal of the signal comparing unit 41, described
The output end of second partial pressure subelement 412 is connect with the inverting input terminal of the operational amplifier OP1, the operational amplifier
The output end of OP1 is the output end of the signal comparing unit 41.
In the present embodiment, it is public that the first partial pressure subelement 411 can be set to detection signal conversion module 20 exports first
Common voltage, and after the first common voltage is divided, the first common voltage after output partial pressure are simultaneously exported to operational amplifier
The normal phase input end of OP1, the first partial pressure subelement 411 then can be set to the second of detection common voltage output end Vcom output
Common voltage, and after the second common voltage is divided, the second common voltage after output partial pressure are simultaneously exported to operation amplifier
The inverting input terminal of device OP1, operational amplifier OP1 can be set into subtracter, and calculate the first common voltage and second public
The difference of voltage to obtain the offset voltage of common voltage, and turns analog compensation voltage through modulus signal converting unit 42
It is changed to digital compensation voltage.
Referring to FIG. 1 and FIG. 2, in an alternative embodiment, the first partial pressure subelement 411 includes first resistor R1 and the
The first end of two resistance R2, the first resistor R1 is the input terminal of the first partial pressure subelement 411, the first resistor R1
Second end be grounded through the second resistance R2, the common end of the first resistor R1 and the second resistance R2 is described first
Divide the output end of subelement 411.
In the present embodiment, first resistor R1 and second resistance R2 are divided the output to realize the first common voltage, root
According to voltage divider principle, first resistor R1 and the ratio of second resistance R2 are bigger, and the voltage got on first resistor R1 is also bigger.
In this manner it is possible to by the resistance value of adjusting first resistor R1 and/or second resistance R2 come the output of the first common voltage adjusted
Value, and then improve the detection sensitivity of the first common voltage.In an alternative embodiment, first resistor R1 and second resistance R2's
Resistance value can be set to equal.Therefore when the resistance value of first resistor R1 and second resistance R2 can be set to equal, operation is put
The voltage of big device OP1 input terminal can indicate are as follows:
V+=V1/2；
Wherein, V+ indicates that the voltage value of the normal phase input end input of operational amplifier OP1, V1 are the first common voltage value.
Referring to FIG. 1 and FIG. 2, in an alternative embodiment, the second partial pressure subelement 412 includes 3rd resistor R3 and the
The first end of four resistance R4, the 3rd resistor R3 is the input terminal of the second partial pressure subelement 412, the 3rd resistor R3
Second end and the inverting input terminal of the 4th resistance R4 first end and the operational amplifier OP1 interconnect；4th electricity
The second end of resistance R4 is connect with the output end of the operational amplifier OP1.
In the present embodiment, 3rd resistor R3 and the 4th resistance R4 are divided the output to realize the second common voltage,
It is substantially the voltage that inverting input terminal receives, and the output end of the second common voltage and operational amplifier OP1 carry out difference meter
It obtains, can be specifically calculated by formula:
V-=V2- (V2-Vout)/2=(V2+Vout)/2；
Wherein, V- indicates that the voltage value of the inverting input terminal input of operational amplifier OP1, V2 are the second common voltage value,
Vout indicates the voltage value of operational amplifier OP1 output end output.
According to the characteristic of operational amplifier OP1, V+=V-, available (V1)/2=(V2+Vout)/2,
That is V1=V2+Vout finally obtains Vout=V1-V2.
That is Vout is the deviation of theoretical output valve V1 and real output value V2, then through ADC, (simulation turns by this deviation voltage
Number) conversion, numeric type difference △ code is obtained, then this △ code is added with initial code1, obtains code2=code1+
△ code, code2 are compensated revised number code, this code again through DAC (D/A conversion unit 22), and output electricity
Stream signal amplifier 30 is exported, and can be declined voltage caused by rear end and be corrected back setting value.
The present invention also proposes a kind of common voltage integrated circuit.
Referring to FIG. 1 and FIG. 2, which includes:
Common voltage output end Vcom；
Memory 10 is set as storing digital common voltage, and exports；
Signal conversion module 20 is set as receiving the digital common voltage, and the digital common voltage is converted to
It is exported after simulating the first common voltage；
Signal amplifier 30 is set as the first common voltage of the simulation amplifying processing, to be converted to the second public affairs
Common voltage, and export to the common voltage output end Vcom；
Common voltage compensating module 40 is set as generating compensation electricity according to first common voltage and the second common voltage
Pressure, and the signal conversion module 20 is fed back to after being converted to digital compensation voltage, so that 20 basis of the signal conversion module
The digital compensation voltage and digital common voltage, update the first common voltage of the simulation and export.
The common voltage compensating module 40:
Including signal comparing unit 41 and modulus signal converting unit 42；
The signal comparing unit 41 includes the first signal input part and second signal input terminal, the signal comparing unit
41 the first signal input part is connect with the output end of the signal conversion module 20, the second letter of the signal comparing unit 41
Number input terminal is connect with the common voltage output end Vcom, the output end of the signal comparing unit 41 and the modulus signal
The input terminal of converting unit 42 connects；
The signal conversion module 20 includes adder 21 and D/A conversion unit 22, the first input of the adder 21
End is connect with the memory 10, and the second input terminal of the adder 21 is the output end of the modulus signal converting unit 42
Connection, the output end of the adder 21 are connect with the input terminal of the D/A conversion unit 22, the D/A conversion unit 22
Output end connect with the signal amplifier 30.
Common voltage integrated circuit of the present invention passes through setting memory 10, signal conversion module 20 and signal amplifier 30,
And on the display apparatus after electricity work, the digital common voltage that memory 10 stores is read by signal conversion module 20, and will
To signal amplifier 30, signal is put for output after the number common voltage is converted to simulation common voltage namely the first common voltage
After common voltage is carried out signal enhanced processing by big device 30, export to the public electrode of display panel, to be mentioned for display panel
For common voltage, the present invention is additionally provided with common voltage compensating module 40, is produced according to the first common voltage and the second common voltage
Raw offset voltage, and the signal conversion module 20 is fed back to after being converted to digital compensation voltage, so that the signal modulus of conversion
Block 20 updates the first common voltage of the simulation and exports according to the digital compensation voltage and digital common voltage.The present invention
Stable common voltage is realized to generate, solve because common voltage offset causes display panel image retention occur, grayscale show it is different
The problem of normal or cross-talk, improve the display effect of display device.
The present invention also proposes that a kind of display device, the display device include:
Display panel 200, including common voltage input terminal, multi-strip scanning line and multiple data lines；
Source electrode driver 300, multiple output ends are connect one by one with the multiple data lines of the display panel 200；
Gate drivers 100, multiple output ends are connect one by one with the multi-strip scanning line of the display panel 200；And
Common voltage integrated circuit 600 as described above, the output end of the common voltage integrated circuit 600 are shown with described
Show the common voltage input terminal connection of panel.The detailed construction of the common voltage integrated circuit 600 can refer to above-described embodiment, this
Place repeats no more；It is understood that due to having used above-mentioned common voltage integrated circuit 600 in the display device of that present invention,
Therefore, the embodiment of the display device of that present invention includes whole technical sides of above-mentioned 600 whole embodiments of common voltage integrated circuit
Case, and technical effect achieved is also identical, details are not described herein.
In the present embodiment, display device further includes that sequence controller 400 and driving power 500 connect, sequence controller 400
It is connect respectively with gate drivers 100, source electrode driver 300 and driving power 500, sequence controller 400 is for being set as
The data-signal, control signal and clock signal of the output of external circuit module are received, and is converted into being suitable for gate drivers
100, the data-signal of source electrode driver 300, control signal and clock signal, realize that the image of liquid crystal display panel is shown.Timing
The control signal that controller 400 exports includes grid control signal and source control signal.Driving power 500 be integrated with it is multiple not
With the DC-DC conversion circuit of circuit function, each conversion circuit exports different voltage values.The input of driving power 500
The voltage of end input is generally 5V or 12V, and the voltage of output includes the operating voltage DVDD provided to sequence controller 400, with
And to the gate turn-on voltage Vgh and shutdown voltage that gate drivers 100 provide.Display panel 200 is made of multiple pixels, often
A pixel is made of three sub-pixels of RGB again.Each sub-pixel is made of a thin film transistor (TFT) and pixel capacitance, multiple
Thin film transistor (TFT) constitutes thin film transistor (TFT) array.
In the present embodiment, sequence controller 400 respectively with gate drivers 100, source electrode driver 300, common voltage collection
It is connected at circuit 600 and driving power 500, sequence controller 400 is used for the number for being set as receiving the output of external circuit module
It is believed that number, control signal and clock signal, and be converted into being suitable for the data letter of gate drivers 100, source electrode driver 300
Number, control signal and clock signal, realize that the image of liquid crystal display panel is shown.The control signal packet that sequence controller 400 exports
Include grid control signal and source control signal.Driving power 500 is integrated with the DC-DC conversion of multiple and different circuit functions
Circuit, each conversion circuit export different voltage values.The voltage of the input terminal input of driving power 500 is generally 5V or 12V,
The voltage of output includes the operating voltage DVDD provided to sequence controller 400, and to the grid that gate drivers 100 provide
Cut-in voltage Vgh and shutdown voltage；The pixel motor of display panel 200 and public electrode respectively with source electrode driver 300 and public
Common voltage integrated circuit 600 connects, with the voltage difference shape formed according to source electrode driver 300 and common voltage integrated circuit 600
The corresponding picture of formula.
The above description is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all at this
Under the inventive concept of invention, using equivalent structure transformation made by description of the invention and accompanying drawing content, or directly/use indirectly
It is included in other related technical areas in scope of patent protection of the invention.
Claims (10)
1. a kind of common voltage integrated circuit, which is characterized in that the common voltage integrated circuit includes:
Common voltage output end；
Memory is set as storing digital common voltage, and exports；
Signal conversion module, is set as receiving the digital common voltage, and the digital common voltage is converted to simulation the
It is exported after one common voltage；
Signal amplifier is set as the first common voltage of the simulation amplifying processing, to be converted to the second common voltage,
And it exports to the common voltage output end；
Common voltage compensating module is set as generating offset voltage according to first common voltage and the second common voltage, and
The signal conversion module is fed back to after being converted to digital compensation voltage, so that the signal conversion module is mended according to the number
Voltage and digital common voltage are repaid, the first common voltage of the simulation is updated and is exported.
2. common voltage integrated circuit as described in claim 1, which is characterized in that the common voltage compensating module includes letter
Number comparing unit, modulus signal converting unit and signal generation unit；
The signal comparing unit include the first signal input part and second signal input terminal, the first of the signal comparing unit
Signal input part is connect with the output end of the signal conversion module, the second signal input terminal of the signal comparing unit and institute
State the connection of common voltage output end, the input terminal company of the output end of the signal comparing unit and the modulus signal converting unit
It connects；The output end of the modulus signal converting unit is connect with the signal conversion module.
3. common voltage integrated circuit as claimed in claim 2, which is characterized in that the signal comparing unit includes that operation is put
Big device, the first partial pressure subelement, the second partial pressure subelement, the input terminal of the first partial pressure subelement is that the signal is more single
First signal input part of member, the output end of the first partial pressure subelement and the normal phase input end of the operational amplifier connect
It connects, the input terminal of the second partial pressure subelement is the second signal input terminal of the signal comparing unit, second partial pressure
The output end of subelement is connect with the inverting input terminal of the operational amplifier, and the output end of the operational amplifier is the letter
The output end of number comparing unit.
4. common voltage integrated circuit as claimed in claim 3, which is characterized in that the first partial pressure subelement includes first
Resistance and second resistance, the first end of the first resistor are the input terminal of the first partial pressure subelement, the first resistor
Second end be grounded through the second resistance, the common end of the first resistor and the second resistance is the first partial pressure
The output end of unit.
5. common voltage integrated circuit as claimed in claim 4, which is characterized in that the first resistor and the second resistance
Resistance value it is equal.
6. common voltage integrated circuit as claimed in claim 3, which is characterized in that the second partial pressure subelement includes third
Resistance and the 4th resistance, the first end of the 3rd resistor are the input terminal of the second partial pressure subelement, the 3rd resistor
Second end and the inverting input terminal of the 4th resistance first end and the operational amplifier interconnect；The of 4th resistance
Two ends are connect with the output end of the operational amplifier.
7. common voltage integrated circuit as described in claim 1, which is characterized in that the conversion module includes adder and number
Mould converting unit, the first input end of the adder are connect with the memory, and the second input terminal of the adder is institute
Voltage compensation module is stated, the output end of the adder is connect with the input terminal of the D/A conversion unit, the digital-to-analogue conversion
The output end of unit is connect with the signal amplifier.
8. common voltage integrated circuit as claimed in any one of claims 1 to 7, which is characterized in that the signal amplifier
For current signal amplifier.
9. a kind of common voltage integrated circuit, which is characterized in that the common voltage integrated circuit includes:
Common voltage output end；
Memory is set as storing digital common voltage, and exports；
Signal conversion module, is set as receiving the digital common voltage, and the digital common voltage is converted to simulation the
It is exported after one common voltage；
Signal amplifier is set as the first common voltage of the simulation amplifying processing, to be converted to the second common voltage,
And it exports to the common voltage output end；
Common voltage compensating module is set as generating offset voltage according to first common voltage and the second common voltage, and
The signal conversion module is fed back to after being converted to digital compensation voltage, so that the signal conversion module is mended according to the number
Voltage and digital common voltage are repaid, the first common voltage of the simulation is updated and is exported；
The common voltage compensating module:
Including signal comparing unit, modulus signal converting unit and signal generation unit；
The signal comparing unit include the first signal input part and second signal input terminal, the first of the signal comparing unit
Signal input part is connect with the output end of the signal conversion module, the second signal input terminal of the signal comparing unit and institute
State the connection of common voltage output end, the input terminal company of the output end of the signal comparing unit and the modulus signal converting unit
It connects；
The conversion module includes adder and D/A conversion unit, and the first input end of the adder and the memory connect
It connects, the second input terminal of the adder is that the output end of the modulus signal converting unit connects, the output of the adder
End is connect with the input terminal of the D/A conversion unit, and the output end and the signal amplifier of the digital-to-analogue conversion unit connect
It connects.
10. a kind of display device, which is characterized in that the display device includes:
Display panel, including common voltage input terminal, multi-strip scanning line and multiple data lines；
Source electrode driver, multiple output ends are connect one by one with the multiple data lines of the display panel；
Gate drivers, multiple output ends are connect one by one with the multi-strip scanning line of the display panel；
And the common voltage integrated circuit as described in claim 1 to 8 any one, or it is as claimed in claim 9 public
Common voltage integrated circuit；
The output end of the common voltage integrated circuit is connect with the common voltage input terminal of the display panel.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811559902.3A CN109509447B (en) | 2018-12-19 | 2018-12-19 | Common voltage integrated circuit and display device |
| PCT/CN2019/123365 WO2020125429A1 (en) | 2018-12-19 | 2019-12-05 | Common voltage integrated circuit and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811559902.3A CN109509447B (en) | 2018-12-19 | 2018-12-19 | Common voltage integrated circuit and display device |
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| CN109509447A true CN109509447A (en) | 2019-03-22 |
| CN109509447B CN109509447B (en) | 2020-08-04 |
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| CN201811559902.3A Active CN109509447B (en) | 2018-12-19 | 2018-12-19 | Common voltage integrated circuit and display device |
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| WO (1) | WO2020125429A1 (en) |
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| WO2020125429A1 (en) * | 2018-12-19 | 2020-06-25 | 惠科股份有限公司 | Common voltage integrated circuit and display device |
| CN111833826A (en) * | 2020-07-23 | 2020-10-27 | 昆山龙腾光电股份有限公司 | Common voltage compensation circuit and display device thereof |
| CN113409740A (en) * | 2020-03-17 | 2021-09-17 | 凌巨科技股份有限公司 | Voltage compensation circuit of liquid crystal display device and method thereof |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN109509447B (en) | 2020-08-04 |
| WO2020125429A1 (en) | 2020-06-25 |
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