CN105489184A - Gamma voltage control system, control method and display device - Google Patents
Gamma voltage control system, control method and display device Download PDFInfo
- Publication number
- CN105489184A CN105489184A CN201610045982.5A CN201610045982A CN105489184A CN 105489184 A CN105489184 A CN 105489184A CN 201610045982 A CN201610045982 A CN 201610045982A CN 105489184 A CN105489184 A CN 105489184A
- Authority
- CN
- China
- Prior art keywords
- voltage
- transmitance
- output terminal
- circuit
- gray scale
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
- G09G2310/027—Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
-
- 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
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
Abstract
The invention relates to a Gamma voltage control system, a control method and a display device. The Gamma voltage control system comprises a transmittance converter, a voltage regulation circuit, a comparison register, a gray scale voltage generating unit and a memory. For a gray scale whose gray scale voltage needs to be adjusted, the Gamma voltage control system can realize self-adjustment of the gray scale voltage according to the corresponding display luminance of the gray scale. When Gamma curve adjustment is carried out on a display device of the voltage control system, operators just need to collect the display luminance of the display device using an optical collection system and output the display luminance to the transmittance converter, and do not need to use corresponding application software and carry out complex operation on the corresponding application software, so that the difficulty of Gamma curve adjustment is substantially lowered.
Description
Technical field
The present invention relates to display technique field, especially relate to a kind of Gamma voltage control system, control method and display device.
Background technology
Current, the principle that display panel carries out picture display is: gate driver circuit drives each bar gate line to open the TFT (ThinFilmTransistor of the pixel electrode be connected with each bar gate line successively successively, thin film transistor (TFT)), data drive circuit driving data line is to be applied to the pixel electrode be connected with data line by gray scale voltage, display panel controls liquid crystal molecule according to the gray scale voltage received and deflects, thus allows the light transmission of different colours with display frame.Because the wavelength difference of the light of different colours causes its penetrance in display panel different, therefore gamma curve (the gamma curve that the light of adjustment shades of colour is corresponding is needed, i.e. gray scale voltage-penetrance curve), thus guarantee the white balance (WhiteTracking) of display frame.
The gray scale voltage that each GTG is corresponding is generally generated according to the gray scale voltage value (digital format) prestored in storer by PGamma (Gamma correction buffer circuit able to programme), and uses the gray scale voltage driving data driving circuit generated.In prior art, it is generally the application specific software storage gray scale voltage value by installing at computer, concrete mode gathers the luminosity of display panel under specific grey-scale by optical system for collecting, transmitance is converted to afterwards by transmitance converter, and be input in corresponding application software, judge whether transmitance meets the demands by application software, and when undesirable, adjust corresponding gray scale voltage value to obtain desirable transmitance.This process need installs specific application software, and corresponding application software general operation is got up comparatively complicated, and the difficulty causing gamma curve to adjust is larger.
Summary of the invention
One object of the present invention is the adjustment difficulty reducing gamma curve.
First aspect, the invention provides a kind of Gamma voltage control system, in display device, comprising: transmitance converter, voltage-regulating circuit, comparand register, gray scale voltage generation unit and storer;
Wherein, described gray scale voltage generation unit is used for gray scale voltage value corresponding to the GTG that shows as required and generates corresponding gray scale voltage;
Described transmitance converter, for gathering the display brightness of display panel under the gray scale voltage value of the current correspondence of GTG to be adjusted, and this display brightness is converted to for representing that the actual transmitance voltage of the actual transmitance that described display brightness is corresponding outputs in described comparand register;
Described voltage-regulating circuit, for reading standard transmitance value corresponding to described GTG to be adjusted from storer, and the standard transmitance voltage being converted to correspondence outputs in described comparand register;
Described comparand register is used for described actual transmitance voltage and described standard transmitance voltage to compare, and comparative result is outputted to described voltage-regulating circuit;
Described voltage-regulating circuit is used for according to described comparative result, adjusts the gray scale voltage value of the current correspondence of this GTG to be adjusted.
Further, described gray scale voltage generation unit comprises central controller and D/A converting circuit, and the gray scale voltage value that the GTG that described central controller is used for showing as required is corresponding controls described D/A converting circuit and generates corresponding gray scale voltage.
Further, described voltage-regulating circuit is used for from storer, read standard transmitance value corresponding to described GTG to be adjusted by described central controller.
Further, described voltage-regulating circuit is by Serial Peripheral Interface (SPI)/I
2c interface reads standard transmitance value from storer.
Further, described voltage-regulating circuit also for reading original gray-scale voltage corresponding to this GTG to be adjusted from storer, and the difference of the gray scale voltage value calculated after adjustment and original gray-scale magnitude of voltage, and by described Difference Storage in storer;
Described gray scale voltage generation unit specifically for reading described difference from storer, and described difference and original gray-scale magnitude of voltage are carried out superposing obtain this GTG to be adjusted adjust after gray scale voltage value, and generate corresponding gray scale voltage according to obtained gray scale voltage value.
Further, described voltage-regulating circuit, specifically for reading maximum standard transmitance value and be converted to maximum standard transmitance voltage from storer, reads minimum sandards transmitance value corresponding to described GTG to be adjusted and is converted to minimum sandards transmitance voltage; And maximum standard transmitance voltage and minimum sandards transmitance voltage are input in comparand register;
Comparative result specifically for actual transmitance voltage and maximum standard transmitance voltage and minimum sandards transmitance voltage being compared respectively, and is outputted to voltage-regulating circuit by described comparand register;
Described voltage-regulating circuit is specifically for when described comparative result is the first comparative result, and adjustment current gray voltage reduces to make the actual transmitance under display panel gray scale voltage after the adjustment; When described comparative result is the second comparative result, adjustment current gray voltage raises to make the actual transmitance of display panel gray scale voltage after the adjustment; Wherein, the first comparative result is that actual transmitance voltage is greater than maximum standard transmitance voltage, and the second comparative result is that actual transmitance voltage is less than minimum sandards transmitance voltage.
Further, described comparand register comprises the first comparator circuit, the second comparator circuit, NOR gate circuit, OR-NOT circuit, inverter circuit and AND circuit, and has the first output terminal, the second output terminal and the 3rd output terminal;
Wherein said first comparator circuit connects described voltage-regulating circuit, transmitance converter and first node, when actual transmitance voltage for exporting at described voltage-regulating circuit is less than described minimum sandards transmitance voltage, described first node is set to low level, otherwise, be set to high level; Second comparator circuit connects described voltage-regulating circuit, transmitance converter and Section Point, when actual transmitance voltage for exporting at described voltage-regulating circuit is greater than described maximum standard transmitance voltage, described Section Point is set to high level, otherwise, be set to low level;
Described NOR gate circuit connects first node, Section Point and described second output terminal, for when described first node is identical with the level state of described Section Point, described second output terminal is set to high level, otherwise is set to low level;
Described OR-NOT circuit connects described second output terminal, described first node and described first output terminal, for when first node and Section Point are low level, described first output terminal is set to high level, otherwise, be set to low level;
Described inverter circuit connects the second output terminal and the 3rd node, for the level of the 3rd node is set to the level contrary with the level of described second output terminal;
Described AND circuit connects Section Point, the 3rd node and described 3rd output terminal, for the 3rd output terminal being set to high level when Section Point and the 3rd node are high level, otherwise is set to low level; Described 3rd output terminal output high level corresponds to described comparand register and exports the first comparative result; Described first output terminal output high level corresponds to described comparand register and exports the second comparative result.
Further, described comparand register comprises the first output terminal and the 3rd output terminal; Described 3rd output terminal output high level corresponds to described comparand register and exports the first comparative result; Described first output terminal output high level corresponds to described comparand register and exports the second comparative result;
Described voltage-adjusting unit comprises logical block, scaling circuit, the first proportion adjustment circuit, the second ratio tune circuit and analog to digital converter;
Described scaling circuit is used for amplifying the voltage of the second input end input and outputting to analog to digital converter by output terminal;
Described first proportion adjustment circuit comprises and is connected on the first switch between the first input end of scaling circuit and output terminal and the first adjustable resistance, the control end of described first switch connects the first output terminal of described comparand register, for the conducting when described first output terminal is high level, described first adjustable resistance is connected with described logical block, is suitable for adjusting resistance under the triggering of logical block;
Described second proportion adjustment circuit second proportion adjustment circuit and described first proportion adjustment circuit in parallel, comprise and be connected on second switch between the first input end of scaling circuit and output terminal and the second adjustable resistance, the control end of described second switch connects the 3rd output terminal of described comparand register, for the conducting when described 3rd output terminal is high level, described second adjustable resistance is connected with described logical block, is suitable for adjusting resistance under the triggering of logical block;
Described logical block connects described first output terminal and described 3rd output terminal, and connects the first adjustable resistance and the second adjustable resistance, when the first output terminal is high level, triggers the first adjustable resistance and increases resistance; When the 3rd output terminal is high level, triggers the second adjustable resistance and increase resistance;
The voltage transitions that described analog to digital converter is used for comparative example amplification circuit output end obtains corresponding magnitude of voltage, and magnitude of voltage conversion obtained is as the gray scale voltage value after adjustment;
The product of described original gray-scale magnitude of voltage and preset value n also for obtaining original gray-scale magnitude of voltage corresponding to described GTG, and is converted to the second input end that voltage is input to scaling circuit by described logical block, and described preset value n is greater than 0 and is less than 1.
Further, described comparand register also has the second output terminal; Described comparand register, also for when described actual transmitance voltage is less than maximum standard transmitance value and is greater than minimum sandards transmitance voltage, exports high level by the second output terminal;
Described voltage-adjusting unit also comprises the 3rd proportion adjustment circuit, described 3rd proportion adjustment circuit and described first proportion adjustment circuit and the second proportion adjustment circuit in parallel, comprise the 3rd switch and the fixed value resistance be connected between the first input end of scaling circuit and output terminal, the control end of described 3rd switch connects the second output terminal of described comparand register, for the conducting when described second output terminal is high level, described fixed value resistance is suitable for making the enlargement factor of described scaling circuit to be 1/n.
Further, described preset value n is 1/2.
Second aspect, the invention provides a kind of display device, it is characterized in that, comprises the Gamma voltage control system described in above-mentioned any one.
The third aspect, the invention provides a kind of Gamma voltage control method, for in Gamma voltage control system, described Gamma voltage control system is used for, in display device, comprising: transmitance converter, voltage-regulating circuit, comparand register, gray scale voltage generation unit and storer; Described method comprises:
Transmitance converter gathers the display brightness of display panel under the gray scale voltage value of the current correspondence of GTG to be adjusted, and is converted to by this display brightness for representing that the actual transmitance voltage of the actual transmitance that described display brightness is corresponding outputs in comparand register;
Voltage-regulating circuit reads standard transmitance value corresponding to described GTG to be adjusted from storer, and the standard transmitance voltage being converted to correspondence outputs in comparand register
Described actual transmitance voltage and described standard transmitance voltage compare by comparand register, and comparative result is outputted to voltage-regulating circuit;
Voltage-regulating circuit, according to described comparative result, adjusts the gray scale voltage value of the current correspondence of this GTG to be adjusted; ;
The gray scale voltage value that the GTG that gray scale voltage generation unit shows as required is corresponding generates corresponding gray scale voltage.
Gamma voltage control system provided by the invention, can for gray scale voltage GTG to be adjusted, and the display brightness corresponding according to this GTG, from Row sum-equal matrix gray scale voltage.When carrying out gamma curve adjustment to the display device comprising Gamma voltage control system provided by the invention, operating personnel only need to utilize optical system for collecting gather the display brightness of display device and output in transmitance converter, and without the need to by means of corresponding application software, more without the need to carrying out complicated operation to corresponding application software, the difficulty of gamma curve adjustment significantly can be reduced.
Accompanying drawing explanation
Can understanding characteristic information of the present invention clearly and advantage by reference to accompanying drawing, accompanying drawing is schematic and should not be construed as and carry out any restriction to the present invention, in the accompanying drawings:
Fig. 1 shows the structural representation of the Gamma voltage control system that one embodiment of the invention provides;
Fig. 2 shows the structural representation of part-structure in the Gamma voltage control system that one embodiment of the invention provides.
Embodiment
In order to more clearly understand above-mentioned purpose of the present invention, feature and advantage, below in conjunction with the drawings and specific embodiments, the present invention is further described in detail.It should be noted that, when not conflicting, the feature in the embodiment of the application and embodiment can combine mutually.
Set forth a lot of detail in the following description so that fully understand the present invention; but; the present invention can also adopt other to be different from other modes described here and implement, and therefore, protection scope of the present invention is not by the restriction of following public specific embodiment.
First aspect, the invention provides a kind of Gamma voltage control system, for in display device, see Fig. 1, this system can comprise: transmitance converter 100, comparand register 200, voltage-regulating circuit 300, gray scale voltage generation unit 400 and storer 500; For convenience of description, also show optical system for collecting 600 and display panel 700 in figure;
Wherein, gray scale voltage generation unit 400 generates corresponding gray scale voltage for the GTG that shows as required and by OUT, OUT2 ... OUT14 illustrates, with driving data driving circuit; The standard transmitance value that each GTG is corresponding is stored in described storer 500;
For the GTG that gray scale voltage is to be adjusted, transmitance converter 100, voltage-regulating circuit 300, comparand register 200 are respectively used to perform following operation:
Transmitance converter 100, for gathering the display brightness of display panel under current gray voltage, and is converted to the actual transmitance voltage of corresponding actual transmitance and outputs in comparand register 200 by this display brightness;
Voltage-regulating circuit 300, for reading standard transmitance value corresponding to this GTG to be adjusted from storer 500, and the standard transmitance electricity being converted to correspondence is forced in comparand register 200;
Comparative result for described actual transmitance voltage and described standard transmitance voltage being compared, and is outputted to voltage-regulating circuit 300 by comparand register 200;
Voltage-regulating circuit 300, for according to described comparative result, adjusts the gray scale voltage value of the current correspondence of the GTG of this adjustment.Specifically, can when comparative result be the first comparative result, adjustment current gray voltage reduces to make the actual transmitance under display panel gray scale voltage after the adjustment; When described comparative result is the second comparative result, adjustment current gray voltage raises to make the actual transmitance of display panel gray scale voltage after the adjustment; Here the first comparative result is that actual transmitance voltage is greater than standard transmitance voltage, and the second comparative result is here that actual transmitance voltage is less than standard transmitance voltage.
Gamma voltage control system provided by the invention, display brightness that can be corresponding according to GTG, from the gray scale voltage of this GTG of Row sum-equal matrix.When carrying out gamma curve adjustment to the display device comprising Gamma voltage control system provided by the invention, operating personnel only need to utilize optical system for collecting gather the display brightness of display panel and output in transmitance converter, and without the need to by means of corresponding application software, more without the need to carrying out complicated operation to corresponding application software, the difficulty of gamma curve adjustment significantly can be reduced.And in above-mentioned Gamma voltage control system, without the need to carrying out a large amount of improvement to the central controller of Gamma voltage control system, thus the central controller that configuration can be used lower, reduce the cost of manufacture of corresponding display device.
In the specific implementation, see Fig. 1, above-mentioned gray scale voltage generation unit 400 can specifically comprise: central controller 410 and multiple D/A converting circuit DAC, and central controller 410 generates corresponding gray scale voltage for the gray scale voltage value domination number analog conversion circuit DAC that the GTG that shows as required is corresponding.In addition in the specific implementation, above-mentioned gray scale voltage generation unit 400 can also comprise the VCOM register 420 for generating common electric voltage value, this VCOM register 420 connects one of them D/A converting circuit DAC, generates corresponding common electric voltage VCOM for controlling this digital-to-analogue conversion circuit DAC and outputs to display panel by Vcom output interface.
In the specific implementation, above-mentioned voltage-regulating circuit 300 reads standard transmitance value corresponding to GTG from storer 500, can be specifically the standard transmitance value read by described central controller 410 in storer; Or also can arrange fetch interface such as Serial Peripheral Interface (SPI) (SPI) or/I2C interface etc. that can read digital signal from storer in voltage-regulating circuit 300, voltage-regulating circuit 300 directly reads corresponding standard transmitance value by these fetch interfaces.The benefit of front a kind of mode to reduce the design difficulty of voltage-regulating circuit 300, without the need to arranging the fetch interface of such as Serial Peripheral Interface (SPI) (SPI) or/I2C interface and so on wherein; The benefit of rear a kind of mode is, without the need to doing corresponding improvement to central controller.Specifically from storer, how to read corresponding standard transmitance value can't affect enforcement of the present invention, and corresponding technical scheme also all should fall into protection scope of the present invention.
In the specific implementation, above-mentioned storer 500 can be nonvolatile memory, and central controller 410 then can select general processor, by carrying out easy configuration to processor here, can realize coordinating corresponding adjustment process.And the concrete structure of transmitance converter 100 also can see prior art, the present invention also repeats no more at this.Main some embodiments to above-mentioned voltage-regulating circuit and comparand register are described in detail below.
In the specific implementation, the standard transmitance value that above-mentioned voltage-regulating circuit 300 reads from storer 500 can be a specific value, also can be a scope.When for a scope, above-mentioned voltage-regulating circuit 300 can specifically for reading maximum standard transmitance voltage (maximum standard transmitance voltage can be G2.0) and being converted to maximum standard transmitance voltage, from storer 500, read minimum sandards transmitance value (minimum sandards transmitance value can be G2.4) and be converted to minimum sandards transmitance voltage, and by maximum standard transmitance voltage (for convenience of description, hereinafter referred to as Vgmax, in the specific implementation, Vgmax can be magnitude of voltage corresponding to transmitance G2.0) input end of comparand register 200 is outputted to by an output terminal, and by minimum sandards transmitance voltage (for convenience of description, hereinafter referred to as Vgmin, Vgmin can be magnitude of voltage corresponding to transmitance G2.4) another input end of comparand register 200 is outputted to by another output terminal.
In the specific implementation, as the preferred mode of one, voltage-regulating circuit 300 can also be used for from storer 500, read original gray-scale voltage corresponding to this GTG to be adjusted, and the difference of the gray scale voltage value calculated after adjustment and original gray-scale magnitude of voltage, and by described Difference Storage in storer 500;
And gray scale voltage generation unit 400 specifically for reading described difference from storer 500, and described difference and original gray-scale magnitude of voltage are carried out superposing obtain this GTG adjust after gray scale voltage value, and generate corresponding gray scale voltage according to obtained gray scale voltage value.
Same, the voltage-regulating circuit when here possesses such as I
2during the fetch interface of C and SPI and so on, can directly by described Difference Storage in the storer 500 of correspondence; When voltage-regulating circuit 300 does not possess above-mentioned fetch interface, then can by the central controller 410 in gray scale voltage generation unit 400 by corresponding Difference Storage in the storer 500 of correspondence.
Here the gray scale voltage value after difference can refer to adjustment deducts the magnitude of voltage that original gray-scale magnitude of voltage obtains, this difference can be on the occasion of also can for negative value like this, this difference and original gray-scale magnitude of voltage can be carried out suing for peace the gray scale voltage value after being adjusted by gray scale voltage generation unit 400 afterwards, generate corresponding gray scale voltage afterwards according to this gray scale voltage value.Here original gray-scale magnitude of voltage can be the gray scale voltage value be pre-written into for above-mentioned GTG in storer 500.
In the specific implementation, comparative result specifically for being compared with maximum standard transmitance voltage and minimum sandards transmitance voltage respectively by actual transmitance voltage, and can be outputted to voltage-regulating circuit 300 by above-mentioned comparand register 200; Now, in the first above-mentioned comparative result, the actual transmitance voltage of indication is greater than standard transmitance voltage and specifically can refers to that actual transmitance voltage is greater than maximum standard transmitance voltage, and in the second above-mentioned comparative result, the actual transmitance voltage of indication is less than standard transmitance voltage and specifically can refers to that actual transmitance voltage is less than minimum sandards transmitance voltage.
Specifically, when comparand register 200 is for comparing actual transmitance voltage and maximum standard transmitance voltage Vgmax and minimum sandards transmitance voltage Vgmin, the concrete structure of comparand register 200 can reference diagram 2, comprising:
First comparator circuit U1, the second comparator circuit U2, NOR gate circuit U3, OR-NOT circuit U4, inverter circuit U5 and AND circuit U6, and there is the first output terminal O1, the second output terminal O2 and the 3rd output terminal O3;
Wherein an input end of the first comparator circuit U1 connects the output terminal that voltage-regulating circuit 300 exports minimum sandards transmitance voltage Vgmin, another input end connects the output terminal of transmitance converter 100, output terminal connects first node N1, when actual transmitance voltage for exporting at described voltage-regulating circuit is less than described minimum sandards transmitance voltage Vgmin, described first node N1 is set to low level, otherwise, be set to high level; An input end of the second comparator circuit connects the output terminal that voltage-regulating circuit 300 exports maximum standard transmitance value Vgmax, another input end connects the output terminal of transmitance converter 100, output terminal connects Section Point N2, actual transmitance voltage for exporting at described voltage-regulating circuit 300 is greater than described maximum standard transmitance value when carrying out, described Section Point N2 is set to high level, otherwise, be set to low level;
An input end of NOR gate circuit U3 connects first node N1, another input end connects Section Point N2, and output terminal connects the second output terminal O2, for when first node N1 is identical with the level state of Section Point N2, second output terminal O2 is set to high level, otherwise is set to low level;
An input end of described OR-NOT circuit U4 connects the second output terminal O2, and another input end connects first node N1, and output terminal connects the first output terminal O1, for when first node N1 and Section Point N2 is low level, first output terminal O1 is set to high level, otherwise, be set to low level;
The input end of described inverter circuit U5 connects the second output terminal O2, for exporting the level contrary with the level of the second output terminal O2;
An input end of described AND circuit U6 connects Section Point N2, and another input end connects the 3rd node N3; Output terminal connects the 3rd output terminal O3, for the 3rd output terminal O3 being set to high level when Section Point N2 and the 3rd node N3 is high level, otherwise is set to low level;
Here, the 3rd output terminal O3 output high level corresponds to this comparand register 200 and exports the first comparative result; First output terminal O1 output high level corresponds to this comparand register 200 and exports the second comparative result.
The concrete structure of voltage-adjusting unit 300 see Fig. 2, can comprise logical block 310, scaling circuit U7, the first proportion adjustment circuit, the second ratio tune circuit and analog to digital converter ADC equally;
The voltage that described scaling circuit U7 is used for the second input end C inputs amplifies and outputs to analog to digital converter by output terminal;
Described first proportion adjustment circuit comprises and is connected on the first switch M1 between the first input end A of scaling circuit U7 and output terminal B and the first adjustable resistance R1, the control end of the first switch M1 connects the first output terminal O1 of comparand register, for the conducting when the first output terminal O1 is high level, first adjustable resistance R1 is connected with logical block 310, is suitable for adjusting resistance under the triggering of logical block 310;
Second proportion adjustment circuit and described first proportion adjustment circuit in parallel, comprise and be connected on second switch M2 between the first input end A of scaling circuit U7 and output terminal B and the second adjustable resistance R2, the control end of described second switch M2 connects the 3rd output terminal O3 of described comparand register 200, for the conducting when described 3rd output terminal O3 is high level, described second adjustable resistance R2 is connected with described logical block 310, is suitable for adjusting resistance under the triggering of logical block 310;
Described logical block 310 connects described first output terminal O1 and described 3rd output terminal O3, and connects the first adjustable resistance R1 and the second adjustable resistance R2, when the first output terminal O1 is high level, triggers the first adjustable resistance R1 and increases resistance; When the 3rd output terminal O3 is high level, triggers the second adjustable resistance R2 and reduce resistance;
The voltage transitions that described analog to digital converter ADC is used for comparative example amplification circuit output end B is digital signal;
Described logical block 310 is also for obtaining original gray-scale voltage corresponding to described GTG, and the product Vgray*n of described original gray-scale voltage Vgray and preset value n is input to the output terminal B of scaling circuit U7, wherein, described preset value n is greater than 0 value being less than 1;
Described voltage-adjusting unit also comprises the 3rd proportion adjustment circuit, described 3rd proportion adjustment circuit and described first proportion adjustment circuit and the second proportion adjustment circuit in parallel, comprise and be connected on the 3rd switch M3 between the first input end of scaling circuit and output terminal and fixed value resistance R3, the control end of described 3rd switch M3 connects the second output terminal O2 of described comparand register 200, for the conducting when described 3rd output terminal is high level, fixed value resistance R3 is suitable for making the enlargement factor of described scaling circuit to be 1/n.In the specific implementation, the value of n here can be 1/2.
In the specific implementation, the first comparator circuit U1 here and the second comparator circuit U2 can be anti-phase operational amplification circuit.Wherein the normal phase input end (being expressed as in figure+) of two anti-phase operational amplification circuits all connects the output terminal of transmitance converter, for receiving the voltage that transmitance converter exports, the inverting input (being expressed as in figure-) of the anti-phase operational amplification circuit that the first comparator circuit UI answers connects the output terminal that voltage-regulating circuit 300 exports minimum sandards transmitance voltage Vgmin, and the inverting input of the anti-phase operational amplification circuit that the second comparator circuit U2 answers connects the output terminal that voltage-regulating circuit 300 exports maximum standard transmitance voltage Vgmax.
The process below utilizing the structure in Fig. 2 to realize Voltage Cortrol is described, if first current transmitance meets the requirements, then the actual transmitance voltage of the current output of transmitance converter 100 can be greater than Vgmin and be less than Vgmax, now the first comparer U1 exports high level and first node N1 is set to high level, second comparer U2 output low level, is set to low level by Section Point N2; Now XOR gate U3 exports high level, and the second output terminal O2 is set to high level; And the equal output low level of rejection gate U4 and AND circuit U6,3rd switch M3 pipe is opened, first switch M1 and second switch M2 all turns off, the enlargement factor of operational amplification circuit U7 is 1/n times, then the voltage of the output terminal of operational amplification circuit U7 is the 1/n of the reference voltage n*Vgray of its second input end input, be still Vgray, namely now primary voltage do not adjusted.
When actual transmitance is on the low side, the actual transmitance voltage that current transmitance converter 100 exports can be less than minimum sandards transmitance voltage Vgmin, then the first comparator circuit U1 output low level, the second comparator circuit U2 output low level, causes XOR gate U3 to export as low level; And then cause rejection gate U4 that the first output terminal O1 is set to high level; Because the second comparator circuit U2 output low level causes Section Point N2 to be low level, then Sheffer stroke gate U6 exports as low level; In this stage, the first switch M1 pipe is opened, and second switch M2 and the 3rd switch M3 all turns off, and logical block 310 tunes up the resistance of resistance R1, makes B point voltage be greater than the value of 2 times of Vgray/2, thus increases transmitance; When actual transmitance is higher, the actual transmitance voltage that current transmitance converter 100 exports can be greater than maximum standard transmitance voltage Vgmax, then the first comparator circuit U1 exports high level, and the first comparator circuit U2 exports high level, causes XOR gate U3 to export as low level; And then causing rejection gate U4 output low level, it is flat that Sheffer stroke gate U6 exports height, so second switch M2 opens, M1 and M3 all turns off, logical block 310 turns the resistance of resistance second adjustable resistance R2 down, makes B point voltage be less than the value of 2 times of Vgray/2, thus reduces transmitance.
In any one above-mentioned situation, after the voltage after operational amplification circuit U7 exports adjustment, magnitude of voltage is changed into digital value stored in logical block 310 by analog to digital converter ADC.
In the specific implementation, for a GTG, the process adjusting process of its gray scale voltage may be performed repeatedly, now above-mentioned logical block 310 can specifically when the second output terminal O2 of comparand register 200 exports high level, and the magnitude of voltage voltage transitions of B point obtained is as the gray scale voltage value after adjustment.
Understandablely be; in the specific implementation; the 3rd above-mentioned proportion adjustment circuit is not the structure that must need to arrange; when not arranging the 3rd proportion adjustment circuit; corresponding system also can complete the adjustment of gray scale voltage, and corresponding technical scheme also should fall into protection scope of the present invention.
In the specific implementation, those skilled in the art can go out the hardware configuration of corresponding logical block according to the Functional Design of logical block described in the present invention, such as in order to transmitance value being converted to corresponding magnitude of voltage, corresponding digital to analog converter etc. can be set in logical units.In addition, also can be realized by programming devices such as FPGA.It not is the emphasis that the present invention pays close attention to that the physical circuit of logical block 310 can design, and corresponding technical scheme also should fall into protection scope of the present invention.
Again on the one hand, present invention also offers a kind of display device, this display device comprises the Gamma voltage control system described in above-mentioned any one.
In the specific implementation, display device here can be: any product or parts with Presentation Function such as Electronic Paper, mobile phone, panel computer, televisor, display, notebook computer, digital album (digital photo frame), navigating instrument.
On the other hand, present invention also offers a kind of Gamma voltage control method, for in Gamma voltage control system, described Gamma voltage control system is used for, in display device, comprising: transmitance converter, voltage-regulating circuit, comparand register, gray scale voltage generation unit and storer; The method comprises:
Transmitance converter gathers the display brightness of display panel under the gray scale voltage value of the current correspondence of GTG to be adjusted, and is converted to by this display brightness for representing that the actual transmitance voltage of the actual transmitance that described display brightness is corresponding outputs in comparand register;
Voltage-regulating circuit reads standard transmitance value corresponding to described GTG to be adjusted from storer, and the standard transmitance voltage being converted to correspondence outputs in comparand register
Described actual transmitance voltage and described standard transmitance voltage compare by comparand register, and comparative result is outputted to described voltage-regulating circuit;
Voltage-regulating circuit, according to described comparative result, adjusts the gray scale voltage value of the current correspondence of this GTG to be adjusted; ;
The gray scale voltage value that the GTG that gray scale voltage generation unit shows as required is corresponding generates corresponding gray scale voltage.
Although describe embodiments of the present invention by reference to the accompanying drawings, but those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, such amendment and modification all fall into by within claims limited range.
Claims (12)
1. a Gamma voltage control system, in display device, is characterized in that, comprising: transmitance converter, voltage-regulating circuit, comparand register, gray scale voltage generation unit and storer;
Wherein, described gray scale voltage generation unit is used for gray scale voltage value corresponding to the GTG that shows as required and generates corresponding gray scale voltage;
Described transmitance converter, for gathering the display brightness of display panel under the gray scale voltage value of the current correspondence of GTG to be adjusted, and this display brightness is converted to for representing that the actual transmitance voltage of the actual transmitance that described display brightness is corresponding outputs in described comparand register;
Described voltage-regulating circuit, for reading standard transmitance value corresponding to described GTG to be adjusted from storer, and the standard transmitance voltage being converted to correspondence outputs in described comparand register;
Described comparand register is used for described actual transmitance voltage and described standard transmitance voltage to compare, and comparative result is outputted to described voltage-regulating circuit;
Described voltage-regulating circuit is used for according to described comparative result, adjusts the gray scale voltage value of the current correspondence of this GTG to be adjusted.
2. the system as claimed in claim 1, it is characterized in that, described gray scale voltage generation unit comprises central controller and D/A converting circuit, and the gray scale voltage value that the GTG that described central controller is used for showing as required is corresponding controls described D/A converting circuit and generates corresponding gray scale voltage.
3. system as claimed in claim 2, is characterized in that, described voltage-regulating circuit is used for from storer, read standard transmitance value corresponding to described GTG to be adjusted by described central controller.
4. the system as claimed in claim 1, is characterized in that, described voltage-regulating circuit is by Serial Peripheral Interface (SPI)/I
2c interface reads standard transmitance value from storer.
5. the system as claimed in claim 1, is characterized in that,
Described voltage-regulating circuit also for reading original gray-scale voltage corresponding to this GTG to be adjusted from storer, and the difference of the gray scale voltage value calculated after adjustment and original gray-scale magnitude of voltage, and by described Difference Storage in storer;
Described gray scale voltage generation unit specifically for reading described difference from storer, and described difference and original gray-scale magnitude of voltage are carried out superposing obtain this GTG to be adjusted adjust after gray scale voltage value, and generate corresponding gray scale voltage according to obtained gray scale voltage value.
6. the system as claimed in claim 1, it is characterized in that, described voltage-regulating circuit, specifically for reading maximum standard transmitance value and be converted to maximum standard transmitance voltage from storer, reads minimum sandards transmitance value corresponding to described GTG to be adjusted and is converted to minimum sandards transmitance voltage; And maximum standard transmitance voltage and minimum sandards transmitance voltage are input in comparand register;
Comparative result specifically for actual transmitance voltage and maximum standard transmitance voltage and minimum sandards transmitance voltage being compared respectively, and is outputted to voltage-regulating circuit by described comparand register;
Described voltage-regulating circuit is specifically for when described comparative result is the first comparative result, and adjustment current gray voltage reduces to make the actual transmitance under display panel gray scale voltage after the adjustment; When described comparative result is the second comparative result, adjustment current gray voltage raises to make the actual transmitance of display panel gray scale voltage after the adjustment; Wherein, the first comparative result is that actual transmitance voltage is greater than maximum standard transmitance voltage, and the second comparative result is that actual transmitance voltage is less than minimum sandards transmitance voltage.
7. system as claimed in claim 6, it is characterized in that, described comparand register comprises the first comparator circuit, the second comparator circuit, NOR gate circuit, OR-NOT circuit, inverter circuit and AND circuit, and has the first output terminal, the second output terminal and the 3rd output terminal;
Wherein said first comparator circuit connects described voltage-regulating circuit, transmitance converter and first node, when actual transmitance voltage for exporting at described voltage-regulating circuit is less than described minimum sandards transmitance voltage, described first node is set to low level, otherwise, be set to high level; Second comparator circuit connects described voltage-regulating circuit, transmitance converter and Section Point, when actual transmitance voltage for exporting at described voltage-regulating circuit is greater than described maximum standard transmitance voltage, described Section Point is set to high level, otherwise, be set to low level;
Described NOR gate circuit connects first node, Section Point and described second output terminal, for when described first node is identical with the level state of described Section Point, described second output terminal is set to high level, otherwise is set to low level;
Described OR-NOT circuit connects described second output terminal, described first node and described first output terminal, for when first node and Section Point are low level, described first output terminal is set to high level, otherwise, be set to low level;
Described inverter circuit connects the second output terminal and the 3rd node, for the level of the 3rd node is set to the level contrary with the level of described second output terminal;
Described AND circuit connects Section Point, the 3rd node and described 3rd output terminal, for the 3rd output terminal being set to high level when Section Point and the 3rd node are high level, otherwise is set to low level; Described 3rd output terminal output high level corresponds to described comparand register and exports the first comparative result; Described first output terminal output high level corresponds to described comparand register and exports the second comparative result.
8. system as claimed in claim 6, it is characterized in that, described comparand register comprises the first output terminal and the 3rd output terminal; Described 3rd output terminal output high level corresponds to described comparand register and exports the first comparative result; Described first output terminal output high level corresponds to described comparand register and exports the second comparative result;
Described voltage-adjusting unit comprises logical block, scaling circuit, the first proportion adjustment circuit, the second ratio tune circuit and analog to digital converter;
Described scaling circuit is used for amplifying the voltage of the second input end input and outputting to analog to digital converter by output terminal;
Described first proportion adjustment circuit comprises and is connected on the first switch between the first input end of scaling circuit and output terminal and the first adjustable resistance, the control end of described first switch connects the first output terminal of described comparand register, for the conducting when described first output terminal is high level, described first adjustable resistance is connected with described logical block, is suitable for adjusting resistance under the triggering of logical block;
Described second proportion adjustment circuit second proportion adjustment circuit and described first proportion adjustment circuit in parallel, comprise and be connected on second switch between the first input end of scaling circuit and output terminal and the second adjustable resistance, the control end of described second switch connects the 3rd output terminal of described comparand register, for the conducting when described 3rd output terminal is high level, described second adjustable resistance is connected with described logical block, is suitable for adjusting resistance under the triggering of logical block;
Described logical block connects described first output terminal and described 3rd output terminal, and connects the first adjustable resistance and the second adjustable resistance, when the first output terminal is high level, triggers the first adjustable resistance and increases resistance; When the 3rd output terminal is high level, triggers the second adjustable resistance and increase resistance;
The voltage transitions that described analog to digital converter is used for comparative example amplification circuit output end obtains corresponding magnitude of voltage, and magnitude of voltage conversion obtained is as the gray scale voltage value after adjustment;
The product of described original gray-scale magnitude of voltage and preset value n also for obtaining original gray-scale magnitude of voltage corresponding to described GTG, and is converted to the second input end that voltage is input to scaling circuit by described logical block, and described preset value n is greater than 0 and is less than 1.
9. system as claimed in claim 8, it is characterized in that, described comparand register also has the second output terminal; Described comparand register, also for when described actual transmitance voltage is less than maximum standard transmitance value and is greater than minimum sandards transmitance voltage, exports high level by the second output terminal;
Described voltage-adjusting unit also comprises the 3rd proportion adjustment circuit, described 3rd proportion adjustment circuit and described first proportion adjustment circuit and the second proportion adjustment circuit in parallel, comprise the 3rd switch and the fixed value resistance be connected between the first input end of scaling circuit and output terminal, the control end of described 3rd switch connects the second output terminal of described comparand register, for the conducting when described second output terminal is high level, described fixed value resistance is suitable for making the enlargement factor of described scaling circuit to be 1/n.
10. system as claimed in claim 8, it is characterized in that, described preset value n is 1/2.
11. 1 kinds of display device, is characterized in that, comprise the Gamma voltage control system as described in any one of claim 1-10.
12. 1 kinds of Gamma voltage control methods, it is characterized in that, for in Gamma voltage control system, described Gamma voltage control system is used for, in display device, comprising: transmitance converter, voltage-regulating circuit, comparand register, gray scale voltage generation unit and storer; Described method comprises:
Transmitance converter gathers the display brightness of display panel under the gray scale voltage value of the current correspondence of GTG to be adjusted, and is converted to by this display brightness for representing that the actual transmitance voltage of the actual transmitance that described display brightness is corresponding outputs in comparand register;
Voltage-regulating circuit reads standard transmitance value corresponding to described GTG to be adjusted from storer, and the standard transmitance voltage being converted to correspondence outputs in comparand register
Described actual transmitance voltage and described standard transmitance voltage compare by comparand register, and comparative result is outputted to voltage-regulating circuit;
Voltage-regulating circuit, according to described comparative result, adjusts the gray scale voltage value of the current correspondence of this GTG to be adjusted;
The gray scale voltage value that the GTG that gray scale voltage generation unit shows as required is corresponding generates corresponding gray scale voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610045982.5A CN105489184B (en) | 2016-01-22 | 2016-01-22 | Gamma voltage control systems, control method and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610045982.5A CN105489184B (en) | 2016-01-22 | 2016-01-22 | Gamma voltage control systems, control method and display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105489184A true CN105489184A (en) | 2016-04-13 |
| CN105489184B CN105489184B (en) | 2017-12-01 |
Family
ID=55676135
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610045982.5A Expired - Fee Related CN105489184B (en) | 2016-01-22 | 2016-01-22 | Gamma voltage control systems, control method and display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105489184B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105702215A (en) * | 2016-04-26 | 2016-06-22 | 京东方科技集团股份有限公司 | Gamma voltage correction method and device |
| CN107731191A (en) * | 2017-11-15 | 2018-02-23 | 深圳市华星光电技术有限公司 | Gamma circuits and liquid crystal panel |
| CN108922486A (en) * | 2018-07-17 | 2018-11-30 | 创维液晶器件(深圳)有限公司 | Gamma adjustment method, device and computer readable storage medium |
| CN109859710A (en) * | 2019-02-26 | 2019-06-07 | 昆山龙腾光电有限公司 | Gate driving circuit |
| TWI665654B (en) * | 2018-04-11 | 2019-07-11 | 立錡科技股份有限公司 | Liquid crystal display and gamma voltage correction method |
| WO2020010862A1 (en) * | 2018-07-13 | 2020-01-16 | 浪潮电子信息产业股份有限公司 | Power supply control system and method for multi-node server |
| CN113936621A (en) * | 2021-12-17 | 2022-01-14 | 深圳精智达技术股份有限公司 | Correction method and related device for LCD display screen P-gamma |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003316333A (en) * | 2002-04-25 | 2003-11-07 | Sharp Corp | Display driving device and display device using the same |
| CN201364723Y (en) * | 2009-03-12 | 2009-12-16 | 青岛海信电器股份有限公司 | Gamma caching circuit adapting to various LCDs and television adopting same |
| CN102467862A (en) * | 2010-11-17 | 2012-05-23 | 京东方科技集团股份有限公司 | Voltage regulation method and device of liquid crystal display panel |
| CN104008736A (en) * | 2013-02-26 | 2014-08-27 | 合肥京东方光电科技有限公司 | Apparatus for automatically adjusting gamma curve of LCD, and optical debugging apparatus |
| CN105047177A (en) * | 2015-08-19 | 2015-11-11 | 京东方科技集团股份有限公司 | Display equipment adjustment device, display equipment adjustment method, and display device |
-
2016
- 2016-01-22 CN CN201610045982.5A patent/CN105489184B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003316333A (en) * | 2002-04-25 | 2003-11-07 | Sharp Corp | Display driving device and display device using the same |
| CN201364723Y (en) * | 2009-03-12 | 2009-12-16 | 青岛海信电器股份有限公司 | Gamma caching circuit adapting to various LCDs and television adopting same |
| CN102467862A (en) * | 2010-11-17 | 2012-05-23 | 京东方科技集团股份有限公司 | Voltage regulation method and device of liquid crystal display panel |
| CN104008736A (en) * | 2013-02-26 | 2014-08-27 | 合肥京东方光电科技有限公司 | Apparatus for automatically adjusting gamma curve of LCD, and optical debugging apparatus |
| CN105047177A (en) * | 2015-08-19 | 2015-11-11 | 京东方科技集团股份有限公司 | Display equipment adjustment device, display equipment adjustment method, and display device |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105702215A (en) * | 2016-04-26 | 2016-06-22 | 京东方科技集团股份有限公司 | Gamma voltage correction method and device |
| CN105702215B (en) * | 2016-04-26 | 2018-05-25 | 京东方科技集团股份有限公司 | Gamma electric voltage bearing calibration and device |
| CN107731191A (en) * | 2017-11-15 | 2018-02-23 | 深圳市华星光电技术有限公司 | Gamma circuits and liquid crystal panel |
| TWI665654B (en) * | 2018-04-11 | 2019-07-11 | 立錡科技股份有限公司 | Liquid crystal display and gamma voltage correction method |
| WO2020010862A1 (en) * | 2018-07-13 | 2020-01-16 | 浪潮电子信息产业股份有限公司 | Power supply control system and method for multi-node server |
| CN108922486A (en) * | 2018-07-17 | 2018-11-30 | 创维液晶器件(深圳)有限公司 | Gamma adjustment method, device and computer readable storage medium |
| CN109859710A (en) * | 2019-02-26 | 2019-06-07 | 昆山龙腾光电有限公司 | Gate driving circuit |
| CN113936621A (en) * | 2021-12-17 | 2022-01-14 | 深圳精智达技术股份有限公司 | Correction method and related device for LCD display screen P-gamma |
| CN113936621B (en) * | 2021-12-17 | 2022-03-22 | 深圳精智达技术股份有限公司 | Correction method and related device for LCD display screen P-gamma |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105489184B (en) | 2017-12-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105489184A (en) | Gamma voltage control system, control method and display device | |
| JP5988307B2 (en) | Gamma voltage generator and display device | |
| JP4918007B2 (en) | Method for manufacturing array substrate for liquid crystal display device | |
| CN109493824B (en) | Source driver, display device and driving method thereof | |
| CN1979621A (en) | Driving apparatus of backlight and method of driving backlight using the same | |
| WO2020173207A1 (en) | Gamma voltage production circuit, driver circuit, and display device | |
| JP2004226952A (en) | Apparatus for accelerating response of display and driving method | |
| JP2002258816A (en) | Liquid crystal driving | |
| CN101594118A (en) | The relevant source electrode driver of operational amplifier and display unit thereof | |
| US7061464B2 (en) | Liquid crystal display and method for driving the same | |
| JP4287728B2 (en) | Liquid crystal display | |
| KR100486281B1 (en) | Super Twist Nematic liquid crystal display driver for reducing power consumption | |
| KR102552947B1 (en) | Display apparatus and driving method thereof | |
| JP2017501540A (en) | Backlight driving circuit, liquid crystal display device, and driving method | |
| US8310507B2 (en) | Display device drive circuit | |
| US7728531B2 (en) | Lamp driving circuit, inverter board and display apparatus having the same | |
| CN101582248B (en) | Source driver of display, operational amplifier and relative method | |
| CN104978942B (en) | Drive circuit, driving method and display device | |
| TW201007661A (en) | Driving method and driving apparatus for display apparatus | |
| JP2009044675A5 (en) | ||
| JP2020527019A (en) | Output voltage adjustment circuit and liquid crystal display device | |
| CN101989001B (en) | Common voltage generating circuit of liquid crystal display | |
| US20170092206A1 (en) | Pre-emphasis circuit | |
| KR20110029784A (en) | Driving circuit for liquid crystal display | |
| CN213277412U (en) | Drive chip, drive circuit and display device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171201 Termination date: 20220122 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |