CN105590583B - Gray scale voltage generation circuit, production method, driving circuit and display device - Google Patents
Gray scale voltage generation circuit, production method, driving circuit and display device Download PDFInfo
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- CN105590583B CN105590583B CN201610183414.1A CN201610183414A CN105590583B CN 105590583 B CN105590583 B CN 105590583B CN 201610183414 A CN201610183414 A CN 201610183414A CN 105590583 B CN105590583 B CN 105590583B
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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
- G09G3/22—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 using controlled light sources
- G09G3/30—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 using controlled light sources using electroluminescent panels
- G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
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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
- G09G2320/0271—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
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Abstract
The present invention provides a kind of gray scale voltage generation circuit, production method, driving circuit and display devices, including gammate, resistance string and selecting unit, multiple interpolating arithmetic elements and multiple voltage drive units, since the present invention does not generate corresponding with the image data of the high-bit width of N-bit 2 using resistance string completelyNA gray scale voltage, but resistance string is used to generate preceding M corresponding 2 with the image data of high-bit widthMA gray scale voltage, from 2MAfter first voltage and second voltage are selected in a gray scale voltage, decile is carried out to difference therebetween, and select voltage corresponding with (N M) position after high-bit width image data, finally the voltage is added to obtain gray scale voltage corresponding with high-bit width image data with first voltage, therefore, the number by increasing resistance string and cabling are not required to increase the bit wide of gray scale voltage generation circuit, so as to which the complexity of gray scale voltage generation circuit cabling will not be caused to increase and the increase of driving chip area.
Description
Technical field
The present invention relates to luminescence display technical field, more specifically to a kind of gray scale voltage generation circuit, generation side
Method, driving circuit and display device.
Background technology
Organic Light Emitting Diode (Organic Light Emitting Diode, abbreviation OLED) display technology is a kind of profit
Reversible color is generated to realize the technology of display under electric current driving with organic semiconducting materials.Surpass since OLED display screen has
Gently, the advantages that ultra-thin, high brightness and high-luminous-efficiency, therefore, it is considered to be most promising display technology of new generation.
OLED display screen shows that the quality of image is heavily dependent on the performance of its driving chip, and the driving chip
In, the module that influences image displaying quality be grayscale voltage generation circuit and DAC (Digital to analog converter,
Digital analog converter).Wherein, grayscale voltage generation circuit generates hot side supply voltage VDD by nonlinear resistance string
Multiple gray scale voltages between low potential side supply voltage VSS.For example, when the image data of input is N, 2 are generatedNA ash
Rank voltage.DAC is selected corresponding with the image data of input from multiple gray scale voltages that grayscale voltage generation circuit generates
One gray scale voltage, then exported the gray scale voltage selected to OLED display screen by voltage buffer grade, OLED to be driven to show
Screen is shown.
In order to improve the resolution ratio of OLED display screen and image quality, it is necessary to expand the bit wide of image data
Exhibition, such as from 8 Bits Expandings to 10 even 12, simultaneously, it is also desirable to the gray scale electricity inside the driving chip of OLED display screen
The bit wide of pressure generation circuit is extended accordingly, so that the bit wide phase of the bit wide and image data of the gray scale voltage generated
Match somebody with somebody.In the prior art usually by increasing resistance string and cabling in grayscale voltage generation circuit, electricity is generated to grayscale voltage
Road carries out the extension of bit wide.But since OLED display screen includes at least the pixel of three kinds of colors of RGB, and each face
The pixel of color is required for a gray scale voltage generation circuit that gray scale voltage is provided separately, therefore, the pixel pair of each color
The gray scale voltage generation circuit answered is required for increasing resistance and cabling, so can not only increase the complexity of cabling, can also increase
The area of OLED display screen driving chip.
In addition, under normal circumstances, the input (input voltage, input current) and output (brightness) of OLED display screen are not
Linear proportional relationship, and since human eye is different to the sensitivity of light at different brightnesses, so more preferable in order to obtain
Visual display effect need to carry out gamma characteristic correction to the input-output characteristic of the driving chip of OLED display screen.Existing skill
In art, grayscale voltage generation circuit is under the control of gamma correction control signal by changing the resistance value of some fixed points come real
The now gamma correction of the point, and the gray scale voltage after output calibration, still, since the gray scale voltage after correction is still by non-
What linear resistance string was realized, it therefore, can cause that gamma curve is not smooth enough, calibration accuracy is relatively low, influence OLED display screen and show
The quality of image.
The content of the invention
In view of this, the present invention provides a kind of gray scale voltage generation circuit, production method, driving circuit and display dresses
It puts, to solve the complexity of the cabling of gray scale voltage generation circuit caused by increasing new resistance and cabling in the prior art
The problem of degree increase and the increase of driving chip area and caused by carrying out gamma correction by changing the resistance value of fixed point
Gamma curve after correction is not smooth enough and the problem of calibration accuracy is relatively low.
To achieve the above object, the present invention provides following technical solution：
A kind of gray scale voltage generation circuit is transported including gammate, resistance string and selecting unit, multiple interpolatings
Calculate unit and multiple voltage drive units；
The gammate is used to select the low-bit width picture number with input under the control of the control signal of input
According to the high-bit width image data of corresponding N-bit, and by preceding M of the high-bit width image data be transmitted to the resistance string and
Rear (N-M) position of the high-bit width image data is transmitted to the corresponding interpolating arithmetic element by selecting unit,
In, M is the natural number more than 1, and N is the natural number more than M, and the low-bit width image data is any color in display device
Pixel image data；
The resistance string and selecting unit are for generation and preceding M corresponding 2 of the high-bit width image dataMA grayscale
Voltage, and from described 2MSelect in a gray scale voltage with preceding M corresponding first voltages of the high-bit width image data and with
The first voltage has the second voltage of preset difference value, and is transmitted to corresponding interpolating arithmetic element；
The interpolating arithmetic element is used to the first voltage being converted to the first electric current, turns the second voltage
The second electric current is changed to, the electric current between first electric current and the second electric current is divided into 2N- M parts, from described 2N-MIn part electric current
Electric current corresponding with (N-M) position after the high-bit width image data is selected, and is transmitted to corresponding voltage drive unit；
The voltage drive unit is used to the electric current selected being converted to voltage, and by the voltage and described first
Voltage is added to obtain gray scale voltage corresponding with the high-bit width image data.
Preferably, the gammate includes input data distributor, three correction modules, multiple selector and defeated
Go out data distributor, three correction modules are corresponding with the pixel of different colours respectively；
The input data distributor is under the control of said control signal by low-bit width image data transmission
To corresponding correction module；
The correction module is used to select in the high-bit width image data of storage inside and the low-bit width image data
Corresponding high-bit width image data, and the high-bit width image data is transmitted to the multiple selector；
The multiple selector is under the control of said control signal by the output data distributor by described in
Preceding M of high-bit width image data are transmitted to the resistance string and selecting unit, by rear (N-M) of the high-bit width image data
Position is transmitted to corresponding interpolating arithmetic element.
Preferably, the correction module includes correcting register and register control unit；
The correcting register is used to store high-bit width image data；
The register control unit be used for from the correcting register store high-bit width image data in select with it is defeated
The corresponding high-bit width image data of low-bit width image data entered.
Preferably, three correction modules include the first correction module, the second correction module and the 3rd correction module, institute
Stating pixel includes red pixel point, green pixel point and blue pixel point, and the multiple interpolating arithmetic element includes the
One interpolating arithmetic element, the second interpolating arithmetic element and the 3rd interpolating arithmetic element；
The input data distributor is used under the control of said control signal, by the low-bit width image of red pixel point
The low-bit width image data of green pixel point is transmitted to the second correction module, by blueness by data transmission to the first correction module
The low-bit width image data of pixel is transmitted to the 3rd correction module；
First correction module is used to select in the high-bit width image data of storage inside and the red pixel point
The corresponding red pixel point of low-bit width image data high-bit width image data, and be transmitted to the multiple selector so that
The multiple selector is passed preceding M of the high-bit width image data of the red pixel point by the output data distributor
It transports to the resistance string and selecting unit, rear (N-M) position is transmitted to the first interpolating arithmetic element；
Second correction module is used to select in the high-bit width image data of storage inside and the green pixel point
The corresponding green pixel point of low-bit width image data high-bit width image data, and be transmitted to the multiple selector so that
The multiple selector is passed preceding M of the high-bit width image data of the green pixel point by the output data distributor
It transports to the resistance string and selecting unit, rear (N-M) position is transmitted to the second interpolating arithmetic element；
3rd correction module is used to select in the high-bit width image data of storage inside and the blue pixel point
The corresponding blue pixel point of low-bit width image data high-bit width image data, and be transmitted to the multiple selector so that
The multiple selector is passed preceding M of the high-bit width image data of the blue pixel point by the output data distributor
It transports to the resistance string and selecting unit, rear (N-M) position is transmitted to the 3rd interpolating arithmetic element.
Preferably, the interpolating arithmetic element turns current unit including first voltage, second voltage turns current unit
With electric current decoding unit；
The first voltage turns current unit for the first voltage to be converted to the first electric current, and is transmitted to the electricity
Flow decoding unit；
The second voltage turns current unit for the second voltage to be converted to the second electric current, and is transmitted to the electricity
Flow decoding unit；
The electric current decoding unit is used to the electric current between first electric current and the second electric current being divided into 2N-MPart, and
Under the control of rear (N-M) position of the high-bit width image data, from described 2N-MIt is selected and the high-bit width image in part electric current
The corresponding electric current in rear (N-M) position of data.
Preferably, the interpolating arithmetic element further includes the first current mirror unit and the second current mirror unit；
The first voltage turns current unit for the first voltage to be converted to the first electric current, and is transmitted to described the
One current mirror unit；
The second voltage turns current unit for the second voltage to be converted to the second electric current, and is transmitted to described the
Two current mirror units；
The first current mirror unit is used to carry out first electric current amplification of the first ratio, and will be amplified
First electric current is transmitted to the electric current decoding unit；
The second current mirror unit is used to carry out second electric current amplification of the second ratio, and will be amplified
Second electric current is transmitted to the electric current decoding unit, and second ratio and first ratio can be different, by controlling electricity
Traffic mirroring ratio and electric current decoding unit can generate the difference of different multiples；
The electric current decoding unit is used to the electric current between amplified first electric current and the second electric current being divided into
2N-MPart, and under the control of rear (N-M) position of the high-bit width image data, from described 2N-MIt is selected and the height in part electric current
The corresponding electric current in rear (N-M) position of bit wide image data.
A kind of driving circuit, including as above any one of them gray scale voltage generation circuit.
A kind of display device, including driving circuit as described above.
A kind of gray scale voltage production method, applied to as above any one of them gray scale voltage generation circuit, including：
Gammate is selected corresponding with the low-bit width image data inputted under the control of the control signal of input
High-bit width image data；
Resistance string and selecting unit are for generation and preceding M corresponding 2 of the high-bit width image dataMA grayscale electricity
Pressure, and from described 2MSelect in a gray scale voltage with preceding M corresponding first voltages of the high-bit width image data and with institute
Stating first voltage has the second voltage of preset difference value；
The first voltage is converted to the first electric current, the second voltage is converted to second by interpolating arithmetic element
Electric current between first electric current and the second electric current is divided into 2 by electric currentN-MPart, from described 2N-MIt is selected in part electric current and institute
State the corresponding electric current in rear (N-M) position of high-bit width image data；
The electric current selected is converted to voltage by voltage drive unit, and the voltage is added with the first voltage
Obtain gray scale voltage corresponding with the high-bit width image data.
Preferably, the first voltage is converted into the first electric current, the second voltage is converted into the second electric current, by institute
The electric current stated between the first electric current and the second electric current is divided into 2N-MThe process of part includes：
The first voltage is converted into the first electric current, and the amplification of the first ratio is carried out to first electric current；
The second voltage is converted into the second electric current, and the amplification of the second ratio is carried out to second electric current, it is described
Second ratio and first ratio can be different, by controlling current mirror ratio and electric current decoding unit, can generate
The difference of different multiples；
Electric current between amplified first electric current and the second electric current is divided into 2N-MPart.
Compared with prior art, technical solution provided by the present invention has the following advantages：
Gray scale voltage generation circuit provided by the present invention, production method, driving circuit and display device, due to not complete
Entirely corresponding with the image data of high-bit width 2 are generated using resistance stringNA gray scale voltage, but resistance string is used to generate and height
Preceding M corresponding 2 of bit wide image dataMA gray scale voltage, from 2MFirst voltage and second voltage are selected in a gray scale voltage
Afterwards, decile is carried out to difference therebetween, and selects voltage corresponding with rear (N-M) position of high-bit width image data, finally
The voltage is added with first voltage to obtain gray scale voltage corresponding with high-bit width image data, therefore, is not required to by increasing electricity
The number and cabling for hindering string increase the bit wide of gray scale voltage generation circuit, so as to will not caused by gray scale voltage generation circuit
The complexity increase of cabling and the increase of driving chip area；
Also, the pixel of the different colours in the present invention all generates grayscale electricity by same resistance string and selecting unit
The pixel of pressure rather than each color generates gray scale voltage by a resistance string and selecting unit respectively, therefore, into one
Step reduces the area of driving chip；
Secondly, the gray scale voltage generation circuit in the present invention only need to change gamma when carrying out gamma correction by programming
The purpose of gamma correction can be realized in high-bit width image data in correction unit, also, since resistance string and selecting unit are
According to the gray scale voltage that the image data of high-bit width generates, therefore, the smoothness of the gamma curve after correction and precision higher.
Description of the drawings
It in order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The embodiment of invention, for those of ordinary skill in the art, without creative efforts, can also basis
The attached drawing of offer obtains other attached drawings.
Fig. 1 is the structure diagram of display device provided in an embodiment of the present invention；
Fig. 2 is a kind of structure diagram of gray scale voltage generation circuit provided in an embodiment of the present invention；
Fig. 3 is the structure diagram of gammate provided in an embodiment of the present invention；
Fig. 4 is the concrete structure schematic diagram of gray scale voltage generation circuit provided in an embodiment of the present invention；
Fig. 5 is the structure diagram of interpolating arithmetic element provided in an embodiment of the present invention；
Fig. 6 is a kind of flow chart of gray scale voltage production method provided in an embodiment of the present invention.
Specific embodiment
As described in background, in the prior art by increase resistance string in grayscale voltage generation circuit and cabling come
The bit wide of gray scale voltage generation circuit is extended, still, so can not only increase the complexity of cabling, can also increase OLED
The area of display screen drive chip.Also, in the prior art by changing the electricity of some fixed points in grayscale voltage generation circuit
Resistance value realizes the gamma correction of the point, can so cause that gamma curve is not smooth enough, calibration accuracy is relatively low.
Based on this, the present invention provides a kind of gray scale voltage generation circuit, to overcome the above problem existing in the prior art,
Including gammate, resistance string and selecting unit, multiple interpolating arithmetic elements and multiple voltage drive units；
The gammate is used to select the low-bit width picture number with input under the control of the control signal of input
According to the high-bit width image data of corresponding N-bit, and by preceding M of the high-bit width image data be transmitted to the resistance string and
Rear (N-M) position of the high-bit width image data is transmitted to the corresponding interpolating arithmetic element by selecting unit,
In, M is the natural number more than 1, and N is the natural number more than M, and the low-bit width image data is any color in display device
Pixel image data；
The resistance string and selecting unit are for generation and preceding M corresponding 2 of the high-bit width image dataMA grayscale
Voltage, from described 2MSelect in a gray scale voltage with preceding M corresponding first voltages of the high-bit width image data and with institute
Stating first voltage has the second voltage of preset difference value, and is transmitted to corresponding interpolating arithmetic element；
The interpolating arithmetic element is used to the first voltage being converted to the first electric current, turns the second voltage
The second electric current is changed to, the electric current between first electric current and the second electric current is divided into 2N-MPart, from described 2N-MIn part electric current
Electric current corresponding with rear (N-M) position of the high-bit width image data is selected, and is transmitted to corresponding voltage drive unit；
The voltage drive unit is used to the electric current selected being converted to voltage, and by the voltage and described first
Voltage is added to obtain gray scale voltage corresponding with the high-bit width image data.
The present invention also provides a kind of driving circuit, including as above any one of them gray scale voltage generation circuit.
The present invention also provides a kind of display device, including driving circuit as described above.
The present invention also provides a kind of gray scale voltage production methods, are generated applied to as above any one of them gray scale voltage
Circuit, including：
Gammate is selected corresponding with the low-bit width image data inputted under the control of the control signal of input
High-bit width image data；
Resistance string and selecting unit are according to preceding M multiple ashes generated from resistance string location of the high-bit width image data
Corresponding first voltage is selected in rank voltage and there is the second voltage of preset difference value with the first voltage；
The first voltage is converted to the first electric current, the second voltage is converted to second by interpolating arithmetic element
Electric current between first electric current and the second electric current is divided into 2 by electric currentN-MPart, from described 2N-MIt is selected in part electric current and institute
State the corresponding electric current in rear (N-M) position of high-bit width image data；
The electric current selected is converted to voltage by voltage drive unit, and the voltage is added with the first voltage
Obtain gray scale voltage corresponding with the high-bit width image data.
Gray scale voltage generation circuit provided by the invention, production method, driving circuit and display device, due to not completely
Corresponding with the image data of the high-bit width of N-bit 2 are generated using resistance stringNA gray scale voltage, but resistance string is used to produce
Give birth to preceding M corresponding 2 with the image data of high-bit widthMA gray scale voltage, from 2MFirst voltage and are selected in a gray scale voltage
After two voltages, decile is carried out to difference therebetween, and selects electricity corresponding with rear (N-M) position of high-bit width image data
The voltage, is finally added to obtain gray scale voltage corresponding with high-bit width image data with first voltage, therefore, is not required to pass through by pressure
Increase number and the cabling of resistance string to increase the bit wide of gray scale voltage generation circuit, thus will not caused gray scale voltage generation
The complexity increase of the cabling of circuit and the increase of driving chip area；
Also, the pixel of the different colours in the present invention all generates grayscale electricity by same resistance string and selecting unit
The pixel of pressure rather than each color generates gray scale voltage by a resistance string and selecting unit respectively, therefore, into one
Step reduces the area of driving chip；
Secondly, the gray scale voltage generation circuit in the present invention only need to change gamma when carrying out gamma correction by programming
The purpose of gamma correction can be realized in high-bit width image data in correction unit, also, since resistance string and selecting unit are
According to the gray scale voltage that the image data of high-bit width generates, therefore, the smoothness of the gamma curve after correction and precision higher.
The above are the core concept of the present invention, to enable the above objects, features and advantages of the present invention more obvious easily
Understand, the specific embodiment of the present invention is described in detail below in conjunction with the accompanying drawings.
Many details are elaborated in the following description to facilitate a thorough understanding of the present invention, still the present invention can be with
Implemented using other different from other manner described here, those skilled in the art can be without prejudice to intension of the present invention
In the case of do similar popularization, therefore the present invention is from the limitation of following public specific embodiment.
Secondly, combination schematic diagram of the present invention is described in detail, when describing the embodiments of the present invention, for purposes of illustration only, table
Show that the sectional view of device architecture can disobey general proportion and make partial enlargement, and the schematic diagram is example, should not herein
Limit the scope of protection of the invention.In addition, the three-dimensional space of length, width and depth should be included in actual fabrication.
The embodiment provides a kind of gray scale voltage generation circuit, which is applied to display
In the driving circuit or driving chip of device, for providing the gray scale voltage needed for display for display device.
Optionally, which includes array substrate, the color membrane substrates being oppositely arranged with array substrate and positioned at array
Liquid crystal layer between substrate and color membrane substrates.As shown in Figure 1, array substrate include a plurality of data lines 10, multi-strip scanning line 11, by
Pixel unit 12 i.e. pixel that data cable 10 and scan line 11 surrounded be arranged in array, the number being connected with all data cables 10
According to driving circuit 13, the scan drive circuit 14 being connected with all scan lines 11 and to data drive circuit 13 and turntable driving
Circuit 14 provides the display controller 15 of control signal and image data.
Each pixel unit 12 includes pixel electrode 120 and thin film transistor (TFT) 121, the grid of the thin film transistor (TFT) 121
Be connected with scan line 11, source electrode is connected with data cable 10, draining is connected with pixel electrode 120, scan drive circuit 14 is by sweeping
Line 11 is retouched after the grid input scanning signal of thin film transistor (TFT) 121 so that thin film transistor (TFT) 121 turns on, so that data are driven
Dynamic circuit 13 is inputted by the data-signal i.e. gray scale voltage that data cable 10 inputs by the source electrode of thin film transistor (TFT) 121 and drain electrode
In pixel electrode 120.With the liquid crystal in 12 corresponding liquid crystal layer of pixel unit between pixel electrode 120 and public electrode
Light transmission is overturn under the action of voltage difference, wherein, public electrode covering pixel unit 12, to provide public affairs to all pixel units 12
Common voltage.
Color membrane substrates include the color blocking unit of multiple array arrangements, and each color blocking unit includes at least a red color resistance, one
Green color blocking and a blue color blocking.Each color blocking corresponds to the light of filtering one pixel unit 12 transmission, so that the light penetrated is in red
Color, green or blueness, that is, the pixel unit 12 i.e. pixel is made to be red pixel point, green pixel point or blue pixel
Point.For example, red pixel point takes on a red color, green pixel point is in green, blue pixel point is in blueness.It is red according to three primary color theory
Turquoise three coloured light can be mixed into the light of all colours, therefore, can pass through red pixel point, green pixel point and blue pixel point
Combination realize the display of image.
Gray scale voltage generation circuit provided in this embodiment is located in data drive circuit 13, in display controller 15
Gray scale voltage is generated under the action of the control signal and image data of input.As shown in Fig. 2, the gray scale voltage generation circuit includes
Gammate 20, resistance string and selecting unit 21, multiple interpolating arithmetic elements 22 and multiple voltage drive units 23,
Wherein, an interpolating arithmetic element 22 corresponds to a pixel and sets, and a voltage drive unit 23 also corresponds to a picture
Vegetarian refreshments is set.
Wherein, gammate 20 is used to select the low-bit width image with input under the control of the control signal of input
The image data of 10 bits is such as converted to the picture number of 12 bits by the high-bit width image data of the corresponding N-bit of data (Bit)
According to, and by the preceding M bit images data transmission of high-bit width image data to resistance string and selecting unit 21, by high-bit width image data
Rear (N-M) bit image data transmission to corresponding interpolating arithmetic element 22, wherein, low-bit width image data for display fill
The image data of the pixel of any color in putting, M, N are the natural number more than 1, and N is more than M；
Resistance string and selecting unit 21 are for generation and the preceding M bit images data corresponding 2 of high-bit width image dataMA ash
Rank voltage, and from 2MFirst voltage V1 corresponding with the preceding M bit images data of high-bit width image data is selected in a gray scale voltage
With the second voltage V2 with first voltage V1 with preset difference value；
Interpolating arithmetic element 22 is used to first voltage V1 being converted to the first electric current I1, is converted to second voltage V2
Electric current between first electric current I1 and the second electric current I2 is divided into 2 by the second electric current I2N-MPart, from 2N-MSelected in part electric current with
The corresponding a electric current I0 of rear (N-M) bit image data of high-bit width image data, and electric current I0 is transmitted to corresponding voltage
Driving unit 23；
Voltage drive unit 23 is used to the electric current I0 selected being converted to voltage V0, and by voltage V0 and first voltage V1 phases
Add to obtain gray scale voltage V corresponding with high-bit width image data, and gray scale voltage V is transmitted to corresponding pixel i.e. pixel
Unit 12.
As shown in figure 3, gammate 20 includes 201, three correction modules 202 of input data distributor, multichannel is selected
Device 203 and output data distributor 204 are selected, three correction modules 202 are corresponding with the pixel of different colours respectively.Its
In, input data distributor 201 is used under the control of the control signal inputted in display controller 15, and display controller 15 is defeated
The low-bit width image data entered is transmitted to corresponding correction module 202；Correction module 202 is used for the high-bit width figure in storage inside
It is transmitted as selecting high-bit width image data corresponding with low-bit width image data in data, and by the high-bit width image data selected
To multiple selector 203；Multiple selector 203 is used under the control of the control signal inputted in display controller 15, by defeated
Go out data distributor 204 and the preceding M-bit data of high-bit width image data is transmitted to resistance string and selecting unit 21, by high-bit width figure
As rear (N-M) the position data of data are transmitted to corresponding interpolating arithmetic element 22.
Wherein, high-bit width image data and low-bit width image data use same set of reference voltage, still, due to height
Bit wide image data is than more more grade of low-bit width image data, and therefore, low-bit width data and high-bit width data are not one by one
Corresponding relation, a low-bit width data can correspond to multiple high-bit width image datas, the corresponding height of each low-bit width data
The section of bit wide data can cover multiple high-bit width data from less than low-bit width data to more than low-bit width data.So may be used
To realize the up and down adjustment to low-bit width data, so as to fulfill the effect of nonlinear gamma corrected, while high-bit width data are adjacent
Voltage jump amplitude smaller between numerical value, the curve of generation is more smooth, and display effect is more preferable.
It needs further exist for illustrating, the correction module 202 in the present embodiment includes correcting register and register controls
Unit, wherein, correcting register is stored with corresponding with low-bit width image data all for storing high-bit width image data
High-bit width image data；Register control unit is used to from the high-bit width image data that correcting register stores select and input
The corresponding high-bit width image data of low-bit width image data.
Three correction modules i.e. the first correction module 202a, the second correction module is included with gammate 20 below
202b, the 3rd correction module 202c, multiple interpolating arithmetic elements include the first interpolating arithmetic element 22a, the second electricity
Interpolation operation unit 22b and the 3rd interpolating arithmetic element 22c is flowed, pixel includes red pixel point R, green pixel point G
It is illustrated with exemplified by blue pixel point B.
As shown in figure 4, input data distributor 201 is under control of the control signal, display controller 15 is inputted red
The low-bit width image data of colour vegetarian refreshments is transmitted to the first correction module 202a, the green pixel point that display controller 15 is inputted
Low-bit width image data be transmitted to the second correction module 202b, the low-bit width for the blue pixel point that display controller 15 is inputted
Image data is transmitted to the 3rd correction module 202c.
First correction module 202a is selected and the red pixel point of input in the high-bit width image data of storage inside
The high-bit width image data of the corresponding red pixel point of low-bit width image data, and by the high-bit width picture number of the red pixel point
According to being transmitted to multiple selector 203 so that multiple selector 203 by output data distributor 204 by the height of red pixel point
The preceding M bit images data transmission of bit wide image data is to resistance string and selecting unit 21, by the high-bit width image of red pixel point
The rear N-M bit images data transmission of data is to the first interpolating arithmetic element 22a；
Resistance string and selecting unit 21 generate 2 according to the preceding M bit images data of the high-bit width image data of red pixel pointM
A gray scale voltage, and from this 2MThe preceding M bit images number with the high-bit width image data of red pixel point is selected in a gray scale voltage
According to corresponding first voltage VR1With with first voltage VR1With preset difference value such as 1LSB (Least Significant Bit, most
Low order) second voltage VR2, and by first voltage VR1With second voltage VR2It is transmitted to the first interpolating arithmetic element
22a；
The first voltage V that first interpolating arithmetic element 22a will be receivedR1Be converted to the first electric current IR1, will receive
Second voltage VR2Be converted to the second electric current IR2, by the first electric current IR1With the second electric current IR2Between electric current be divided into 2N-MPart,
And from 2N-MPortion corresponding with rear (N-M) the bit image data of the high-bit width image data of red pixel point is selected in part electric current
Electric current IR0, and by electric current IR0It is transmitted to first voltage driving unit 23a；
The electric current I that first voltage driving unit 23a will be selected afterwardsR0Be converted to voltage VR0, and by voltage VR0With the first electricity
Press VR1Addition obtains gray scale voltage V corresponding with the high-bit width image data of red pixel pointR, and by gray scale voltage VRTransmission
To corresponding red pixel point R.
Second correction module 202b is selected and the green pixel point of input in the high-bit width image data of storage inside
The high-bit width image data of the corresponding green pixel point of low-bit width image data, and by the high-bit width picture number of the green pixel point
According to being transmitted to multiple selector 203 so that multiple selector 203 by output data distributor 204 by the height of green pixel point
The preceding M bit images data transmission of bit wide image data is to resistance string and selecting unit 21, by the high-bit width image of green pixel point
The rear N-M bit images data transmission of data is to the second interpolating arithmetic element 22b；
Resistance string and selecting unit 21 generate 2 according to the preceding M bit images data of the high-bit width image data of green pixel pointM
A gray scale voltage, from this 2MThe preceding M bit images data with the high-bit width image data of green pixel point are selected in a gray scale voltage
Corresponding first voltage VG1With with first voltage VG1Second voltage V with preset difference value (1LSB)G2, and by first voltage VG1
With second voltage VG2It is transmitted to the second interpolating arithmetic element 22b；
The first voltage V that second interpolating arithmetic element 22b will be receivedG1Be converted to the first electric current IG1, will receive
Second voltage VG2Be converted to the second electric current IG2, by the first electric current IG1With the second electric current IG2Between electric current be divided into 2N-MPart,
And from 2N-MPortion corresponding with rear (N-M) the bit image data of the high-bit width image data of green pixel point is selected in part electric current
Electric current IG0, and by electric current IG0It is transmitted to second voltage driving unit 23b；
The electric current I that second voltage driving unit 23b will be selected afterwardsG0Be converted to voltage VG0, and by voltage VG0With the first electricity
Press VG1Addition obtains gray scale voltage V corresponding with the high-bit width image data of green pixel pointG, and by gray scale voltage VGTransmission
To corresponding green pixel point G.
3rd correction module 202c selects the low-bit width with blue pixel point in the high-bit width image data of storage inside
The high-bit width image data of the corresponding blue pixel point of image data, and the high-bit width image data of the blue pixel point is transmitted
To multiple selector 203 so that multiple selector 203 by output data distributor 204 by blue pixel point high-bit width image
The preceding M bit images data transmission of data is to resistance string and selecting unit 21, after the high-bit width image data of blue pixel point
N-M bit images data transmission is to the 3rd interpolating arithmetic element 22c；
Resistance string and selecting unit 21 generate 2 according to the preceding M bit images data of the high-bit width image data of blue pixel pointM
A gray scale voltage, from this 2MThe preceding M bit images data with the high-bit width image data of blue pixel point are selected in a gray scale voltage
Corresponding first voltage VB1With with first voltage VB1Second voltage V with preset difference value (1LSB)B2, and by first voltage VB1
With second voltage VB2It is transmitted to the 3rd interpolating arithmetic element 22c；
The first voltage V that 3rd interpolating arithmetic element 22c will be receivedB1Be converted to the first electric current IB1, will receive
Second voltage VB2Be converted to the second electric current IB2, by the first electric current IB1With the second electric current IB2Between electric current be divided into 2N-MPart,
And from 2N-MElectric current corresponding with rear (N-M) the bit image data of the high-bit width image data of blue pixel point is selected in part electric current
IG0, and by electric current IG0It is transmitted to tertiary voltage driving unit 23c；
The electric current I that tertiary voltage driving unit 23c will be selected afterwardsB0Be converted to voltage VB0, and by voltage VB0With the first electricity
Press VB1Addition obtains gray scale voltage V corresponding with the high-bit width image data of blue pixel pointB, and by gray scale voltage VBTransmission
To corresponding blue pixel point B.
It follows that gray scale voltage generation circuit provided in this embodiment can be by adjusting in the first correction unit 202a
High-bit width image data adjusts the gamma curve of red pixel point, can be by adjusting the high-bit width figure in the second correction unit 202b
It, can be by adjusting the high-bit width image data tune in the 3rd correction unit 202c as the gamma curve of data adjusting green pixel point
The gamma curve of blue pixel point is saved, so that the gamma-curve correction of display device is more accurate, the display effect after correction
More preferably.
It needs further exist for illustrating, any interpolating arithmetic element 22 in the present embodiment includes first voltage and turns electricity
Stream unit 220, second voltage turn current unit 221 and electric current decoding unit 222 i.e. current DAC；
Wherein, first voltage turns current unit 220 for first voltage V1 to be converted to the first electric current I1, and is transmitted to electricity
Flow decoding unit 222；Second voltage turns current unit 221 for second voltage V2 to be converted to the second electric current I2, and is transmitted to
Electric current decoding unit 222；Electric current decoding unit 222 is used to the electric current between the first electric current I1 and the second electric current I2 being divided into 2N -MPart, and under the control of rear (N-M) the bit image data of high-bit width image data, from 2N-MIt is selected and high-bit width figure in part electric current
As the corresponding electric current I0 of rear (N-M) bit image data of data.
In another embodiment of the invention, interpolating arithmetic element further includes the first current mirror unit 223 and
Two current mirror units 224.
As shown in figure 5, first voltage turns current unit 220 for first voltage V1 to be converted to the first electric current I1, and pass
Transport to the first current mirror unit 223；Second voltage turns current unit 221 for second voltage V2 to be converted to the second electric current
I2, and it is transmitted to the second current mirror unit 224；First current mirror unit 223 is used to carry out the first electric current I1 the first ratio
The amplification of example, and amplified first electric current I1 is transmitted to electric current decoding unit 222；Second current mirror unit 224 is used for
The amplification of the second ratio is carried out to the second electric current I2, and amplified second electric current I2 is transmitted to electric current decoding unit 222, the
Two ratios are identical with the first ratio but may be set to be difference, by controlling current mirror ratio that may finally obtain the first electricity
Press V1 and the arbitrary multiple of second voltage V2 differences；
Electric current decoding unit 222 is used to the electric current between amplified first electric current I1 and the second electric current I2 being divided into 2N -MPart, and under the control of rear (N-M) the bit image data of high-bit width image data, from 2N-MIt is selected and high-bit width figure in part electric current
As the corresponding electric current I0 of rear (N-M) bit image data of data.
The voltage conversion current unit of high linearity is used in the present embodiment, can realize the height between voltage and electric current
Linear transformation, existing between the difference current and voltage difference that generate by means of which is a kind of relation of highly linear,
So as to avoid the nonideal non-linear factor of introducing so that the linearity of gamma curve is more preferable.
Gray scale voltage generation circuit provided in this embodiment, due to not generated and high-bit width using resistance string completely
Image data corresponding 2NA gray scale voltage, but resistance string is used to generate the preceding M bit images number with the image data of high-bit width
According to corresponding 2MA gray scale voltage, from 2MAfter first voltage and second voltage are selected in a gray scale voltage, to difference therebetween
Decile is carried out, and selects voltage corresponding with rear (N-M) the bit image data of high-bit width image data, finally by the voltage and the
One voltage is added to obtain gray scale voltage corresponding with high-bit width image data, therefore, be not required to through the number that increases resistance string and
Cabling increases the bit wide of gray scale voltage generation circuit, so as to will not caused by gray scale voltage generation circuit cabling complexity
Increase and the increase of driving chip area；
Also, the pixel of the different colours in the present embodiment all generates grayscale by same resistance string and selecting unit
Voltage rather than the pixel of each color generate gray scale voltage by a resistance string and selecting unit respectively, therefore, into
One step reduces the area of driving chip；
Secondly, the gray scale voltage generation circuit in the present embodiment only need to change gal when carrying out gamma correction by programming
The purpose of gamma correction can be realized in high-bit width image data in horse correction unit, also, due to resistance string and selecting unit
It is the gray scale voltage generated according to the image data of high-bit width, therefore, the smoothness of the gamma curve after correction and precision higher.
The embodiment of the present invention additionally provides a kind of driving circuit, which includes what any of the above-described embodiment provided
Gray scale voltage generation circuit.
The embodiment of the present invention additionally provides a kind of display device, which includes the driving that above-described embodiment provides
Circuit.
The embodiment of the present invention additionally provides a kind of gray scale voltage production method, the grayscale provided applied to above-described embodiment
Voltage generation circuit, as shown in fig. 6, the gray scale voltage production method includes：
S601：Gammate selects the low-bit width image data pair with input under the control of the control signal of input
The high-bit width image data answered；
S602：Resistance string and selecting unit generate preceding M corresponding 2 with the high-bit width image dataMA grayscale electricity
Pressure, and from described 2MSelect in a gray scale voltage with preceding M corresponding first voltages of the high-bit width image data and with institute
Stating first voltage has the second voltage of preset difference value；
S603：The first voltage is converted to the first electric current, converts the second voltage by interpolating arithmetic element
For the second electric current, the electric current between first electric current and the second electric current is divided into 2N-MPart, from described 2N-MIt is selected in part electric current
Go out electric current corresponding with rear (N-M) the bit image data of the high-bit width image data；
S604：The electric current selected is converted to voltage by voltage drive unit, and the voltage is electric with described first
Pressure is added and obtains gray scale voltage corresponding with the high-bit width image data.
The first correction module, the second correction module, the 3rd correction module, multiple electric currents are included with gammate below
Interpolation operation unit includes the first interpolating arithmetic element, the second interpolating arithmetic element and the 3rd interpolating computing list
Member, exemplified by pixel includes red pixel point R, green pixel point G and blue pixel point B, to the generation process of gray scale voltage
It illustrates.
Input data distributor in gammate under control of the control signal, display controller is inputted red
The low-bit width image data of colour vegetarian refreshments is transmitted to the first correction module, by the low level of the green pixel point of display controller input
Wide image data is transmitted to the second correction module, and the low-bit width image data of the blue pixel point of display controller input is transmitted
To the 3rd correction module.
First correction module selects the low level with the red pixel point of input in the high-bit width image data of storage inside
The high-bit width image data of the corresponding red pixel point of wide image data, and the high-bit width image data of the red pixel point is passed
Transport to multiple selector so that multiple selector by output data distributor by the high-bit width image data of red pixel point
Preceding M bit images data transmission is to resistance string and selecting unit, by the rear N-M bit images of the high-bit width image data of red pixel point
Data transmission is to the first interpolating arithmetic element；
Resistance string and selecting unit generate 2 according to the preceding M bit images data of the high-bit width image data of red pixel pointMIt is a
Gray scale voltage, and from this 2MThe preceding M bit images data with the high-bit width image data of red pixel point are selected in a gray scale voltage
Corresponding first voltage VR1With with first voltage VR1Second voltage V with preset difference value such as 1LSBR2, and by first voltage VR1
With second voltage VR2It is transmitted to the first interpolating arithmetic element；
The first voltage V that first interpolating arithmetic element will receiveR1Be converted to the first electric current IR1, by what is received
Second voltage VR2Be converted to the second electric current IR2, by the first electric current IR1With the second electric current IR2Between electric current be divided into 2N-MPart, and
From 2N-MA electricity corresponding with rear (N-M) the bit image data of the high-bit width image data of red pixel point is selected in part electric current
Flow IR0, and by electric current IR0It is transmitted to first voltage driving unit；
The electric current I that first voltage driving unit will be selected afterwardsR0Be converted to voltage VR0, and by voltage VR0With first voltage
VR1Addition obtains gray scale voltage V corresponding with the high-bit width image data of red pixel pointR, and by gray scale voltage VRIt is transmitted to
Corresponding red pixel point R.
Second correction module selects the low level with the green pixel point of input in the high-bit width image data of storage inside
The high-bit width image data of the corresponding green pixel point of wide image data, and the high-bit width image data of the green pixel point is passed
Transport to multiple selector so that multiple selector by output data distributor by the high-bit width image data of green pixel point
Preceding M bit images data transmission is to resistance string and selecting unit, by the rear N-M bit images of the high-bit width image data of green pixel point
Data transmission is to the second interpolating arithmetic element；
Resistance string and selecting unit generate 2 according to the preceding M bit images data of the high-bit width image data of green pixel pointMIt is a
Gray scale voltage, from this 2MThe preceding M bit images data pair with the high-bit width image data of green pixel point are selected in a gray scale voltage
The first voltage V answeredG1With with first voltage VG1Second voltage V with preset difference value (1LSB)G2, and by first voltage VG1With
Second voltage VG2It is transmitted to the second interpolating arithmetic element；
The first voltage V that second interpolating arithmetic element will receiveG1Be converted to the first electric current IG1, by what is received
Second voltage VG2Be converted to the second electric current IG2, by the first electric current IG1With the second electric current IG2Between electric current be divided into 2N-MPart, and
From 2N-MA electricity corresponding with rear (N-M) the bit image data of the high-bit width image data of green pixel point is selected in part electric current
Flow IG0, and by electric current IG0It is transmitted to second voltage driving unit；
The electric current I that second voltage driving unit will be selected afterwardsG0Be converted to voltage VG0, and by voltage VG0With first voltage
VG1Addition obtains gray scale voltage V corresponding with the high-bit width image data of green pixel pointG, and by gray scale voltage VGIt is transmitted to
Corresponding green pixel point G.
3rd correction module selects the low-bit width image with blue pixel point in the high-bit width image data of storage inside
The high-bit width image data of the corresponding blue pixel point of data, and the high-bit width image data of the blue pixel point is transmitted to more
Road selector so that multiple selector by output data distributor by the preceding M bitmaps of blue pixel point high-bit width image data
As data transmission to resistance string and selecting unit, the rear N-M bit images data of the high-bit width image data of blue pixel point are passed
Transport to the 3rd interpolating arithmetic element；
Resistance string and selecting unit generate 2 according to the preceding M bit images data of the high-bit width image data of blue pixel pointMIt is a
Gray scale voltage, from this 2MThe preceding M bit images data pair with the high-bit width image data of blue pixel point are selected in a gray scale voltage
The first voltage V answeredB1With with first voltage VB1Second voltage V with preset difference value (1LSB)B2, and by first voltage VB1With
Second voltage VB2It is transmitted to the 3rd interpolating arithmetic element；
The first voltage V that 3rd interpolating arithmetic element will receiveB1Be converted to the first electric current IB1, by what is received
Second voltage VB2Be converted to the second electric current IB2, by the first electric current IB1With the second electric current IB2Between electric current be divided into 2N-MPart, and
From 2N-MElectric current I corresponding with rear (N-M) the bit image data of the high-bit width image data of blue pixel point is selected in part electric currentG0,
And by electric current IG0It is transmitted to tertiary voltage driving unit；
The electric current I that tertiary voltage driving unit will be selected afterwardsB0Be converted to voltage VB0, and by voltage VB0With first voltage
VB1Addition obtains gray scale voltage V corresponding with the high-bit width image data of blue pixel pointB, and by gray scale voltage VBIt is transmitted to
Corresponding blue pixel point B.
Wherein, when interpolating arithmetic element turns current unit including first voltage, second voltage turns current unit, first
When current mirror unit, the second current mirror unit and electric current decoding unit, the first voltage is converted into the first electric current, is incited somebody to action
The second voltage is converted to the second electric current, and the electric current between first electric current and the second electric current is divided into 2N-MThe mistake of part
Journey includes：
The first voltage is converted into the first electric current, and the amplification of the first ratio is carried out to first electric current；
The second voltage is converted into the second electric current, and the amplification of the second ratio is carried out to second electric current, it is described
Second ratio and first ratio can be different, by controlling current mirror ratio and electric current decoding unit, can generate
The difference of different multiples；
Electric current between amplified first electric current and the second electric current is divided into 2N-MPart.
Gray scale voltage production method provided in this embodiment, due to not generated and high-bit width using resistance string completely
Image data corresponding 2NA gray scale voltage, but resistance string is used to generate preceding M corresponding 2 with the image data of high-bit widthM
A gray scale voltage, and from 2MAfter first voltage and second voltage are selected in a gray scale voltage, difference therebetween is carried out etc.
Point, and voltage corresponding with rear (N-M) position of high-bit width image data is selected, finally the voltage is added to obtain with first voltage
Therefore gray scale voltage corresponding with high-bit width image data, is not required to the number by increasing resistance string and cabling to increase grayscale
The bit wide of voltage generation circuit, so as to will not caused by gray scale voltage generation circuit cabling complexity increase and driving chip
Area increases；
Also, the pixel of the different colours in the present embodiment all generates grayscale by same resistance string and selecting unit
Voltage rather than the pixel of each color generate gray scale voltage by a resistance string and selecting unit respectively, therefore, into
One step reduces the area of driving chip；
Secondly, the gray scale voltage generation circuit in the present embodiment only need to change gal when carrying out gamma correction by programming
The purpose of gamma correction can be realized in high-bit width image data in horse correction unit, also, due to resistance string and selecting unit
It is the gray scale voltage generated according to the image data of high-bit width, therefore, the smoothness of the gamma curve after correction and precision higher.
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with other
The difference of embodiment, just to refer each other for identical similar portion between each embodiment.For device disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so description is fairly simple, related part is said referring to method part
It is bright.
The foregoing description of the disclosed embodiments enables professional and technical personnel in the field to realize or use the present invention.
A variety of modifications of these embodiments will be apparent for those skilled in the art, it is as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and the principles and novel features disclosed herein phase one
The most wide scope caused.
Claims (10)
1. a kind of gray scale voltage generation circuit, which is characterized in that including gammate, resistance string and selecting unit, multiple
Interpolating arithmetic element and multiple voltage drive units；
The gammate is used to select the low-bit width image data pair with input under the control of the control signal of input
The high-bit width image data for the N-bit answered, and it is transmitted to the resistance string and selection by preceding M of the high-bit width image data
Rear (N-M) position of the high-bit width image data is transmitted to the corresponding interpolating arithmetic element by unit, wherein, M is
Natural number more than 1, N are the natural number more than M, and the low-bit width image data is the pixel of any color in display device
The image data of point；
The resistance string and selecting unit are for generation and preceding M corresponding 2 of the high-bit width image dataMA gray scale voltage,
And from described 2MIt selects in a gray scale voltage with preceding M corresponding first voltages of the high-bit width image data and with described
One voltage has the second voltage of preset difference value, and is transmitted to corresponding interpolating arithmetic element；
The interpolating arithmetic element is used to the first voltage being converted to the first electric current, is converted to the second voltage
Electric current between first electric current and the second electric current is divided into 2 by the second electric currentN-MPart, from described 2N-MIt is selected in part electric current
The corresponding electric current in (N-M) position after the high-bit width image data, and it is transmitted to corresponding voltage drive unit；
The voltage drive unit is used to the electric current selected being converted to voltage, and by the voltage and the first voltage
Addition obtains gray scale voltage corresponding with the high-bit width image data.
2. gray scale voltage generation circuit according to claim 1, which is characterized in that the gammate includes input
Data distributor, three correction modules, multiple selector and output data distributor, three correction modules respectively with difference
The pixel of color corresponds to；
The low-bit width image data for being transmitted to pair by the input data distributor under the control of said control signal
The correction module answered；
The correction module is corresponding with the low-bit width image data for being selected in the high-bit width image data of storage inside
High-bit width image data, and the high-bit width image data is transmitted to the multiple selector；
The multiple selector is under the control of said control signal by the output data distributor by the high position
Preceding M of wide image data are transmitted to the resistance string and selecting unit, and rear (N-M) position of the high-bit width image data is passed
Transport to corresponding interpolating arithmetic element.
3. gray scale voltage generation circuit according to claim 2, which is characterized in that the correction module includes correction and deposits
Device and register control unit；
The correcting register is used to store high-bit width image data；
The register control unit is used to from the high-bit width image data that the correcting register stores select and input
The corresponding high-bit width image data of low-bit width image data.
4. gray scale voltage generation circuit according to claim 3, which is characterized in that three correction modules include first
Correction module, the second correction module and the 3rd correction module, the pixel include red pixel point, green pixel point and blueness
Pixel, the multiple interpolating arithmetic element include the first interpolating arithmetic element, the second interpolating arithmetic element
With the 3rd interpolating arithmetic element；
The input data distributor is used under the control of said control signal, by the low-bit width image data of red pixel point
The first correction module is transmitted to, the low-bit width image data of green pixel point is transmitted to the second correction module, by blue pixel
The low-bit width image data of point is transmitted to the 3rd correction module；
First correction module is low with the red pixel point for being selected in the high-bit width image data of storage inside
The high-bit width image data of the corresponding red pixel point of bit wide image data, and the multiple selector is transmitted to, so that described
Preceding M of the high-bit width image data of the red pixel point are transmitted to by multiple selector by the output data distributor
The resistance string and selecting unit, rear (N-M) position are transmitted to the first interpolating arithmetic element；
Second correction module is low with the green pixel point for being selected in the high-bit width image data of storage inside
The high-bit width image data of the corresponding green pixel point of bit wide image data, and the multiple selector is transmitted to, so that described
Preceding M of the high-bit width image data of the green pixel point are transmitted to by multiple selector by the output data distributor
The resistance string and selecting unit, rear (N-M) position are transmitted to the second interpolating arithmetic element；
3rd correction module is low with the blue pixel point for being selected in the high-bit width image data of storage inside
The high-bit width image data of the corresponding blue pixel point of bit wide image data, and the multiple selector is transmitted to, so that described
Preceding M of the high-bit width image data of the blue pixel point are transmitted to by multiple selector by the output data distributor
The resistance string and selecting unit, rear (N-M) position are transmitted to the 3rd interpolating arithmetic element.
5. gray scale voltage generation circuit according to claim 1, which is characterized in that the interpolating arithmetic element includes
First voltage turns current unit, second voltage turns current unit and electric current decoding unit；
The first voltage turns current unit for the first voltage to be converted to the first electric current, and is transmitted to the solution for the current
Code unit；
The second voltage turns current unit for the second voltage to be converted to the second electric current, and is transmitted to the solution for the current
Code unit；
The electric current decoding unit is used to the electric current between first electric current and the second electric current being divided into 2N-MPart, and in institute
Under the control of rear (N-M) position for stating high-bit width image data, from described 2N-MIt is selected and the high-bit width image data in part electric current
The corresponding electric current in rear (N-M) position.
6. gray scale voltage generation circuit according to claim 1, which is characterized in that the interpolating arithmetic element includes
First voltage turns current unit, second voltage turns current unit and electric current decoding unit；The interpolating arithmetic element is also wrapped
Include the first current mirror unit and the second current mirror unit；
The first voltage turns current unit for the first voltage to be converted to the first electric current, and is transmitted to first electricity
Traffic mirroring unit；
The second voltage turns current unit for the second voltage to be converted to the second electric current, and is transmitted to second electricity
Traffic mirroring unit；
The first current mirror unit is used to carry out first electric current amplification of the first ratio, and by amplified first
Electric current is transmitted to the electric current decoding unit；
The second current mirror unit is used to carry out second electric current amplification of the second ratio, and by amplified second
Electric current is transmitted to the electric current decoding unit, and second ratio is identical or different with first ratio setting, passes through control
Current mirror ratio processed can generate the difference of different multiples；
The electric current decoding unit is used to the electric current between amplified first electric current and the second electric current being divided into 2N-M
Part, and under the control of rear (N-M) position of the high-bit width image data, from described 2N-MIt is selected and the high position in part electric current
The corresponding electric current in rear (N-M) position of wide image data.
7. a kind of driving circuit, which is characterized in that including claim 1~6 any one of them gray scale voltage generation circuit.
8. a kind of display device, which is characterized in that including the driving circuit described in claim 7.
9. a kind of gray scale voltage production method, which is characterized in that applied to claim 1~6 any one of them gray scale voltage
Generation circuit, including：
Gammate selects a high position corresponding with the low-bit width image data inputted under the control of the control signal of input
Wide image data；
Resistance string and selecting unit are for generation and preceding M corresponding 2 of the high-bit width image dataMA gray scale voltage, and from
Described 2MSelect in a gray scale voltage with preceding M corresponding first voltages of the high-bit width image data and with the described first electricity
Pressing element has the second voltage of preset difference value；
The first voltage is converted to the first electric current, the second voltage is converted to the second electricity by interpolating arithmetic element
Stream, 2 are divided by the electric current between first electric current and the second electric currentN-MPart, from described 2N-MSelected in part electric current with it is described
The corresponding electric current in rear (N-M) position of high-bit width image data；
The electric current selected is converted to voltage by voltage drive unit, and the voltage is added to obtain with the first voltage
Gray scale voltage corresponding with the high-bit width image data.
10. gray scale voltage production method according to claim 9, which is characterized in that the first voltage is converted to
The second voltage is converted to the second electric current by one electric current, and the electric current between first electric current and the second electric current is divided into
2N-MThe process of part includes：
The first voltage is converted into the first electric current, and the amplification of the first ratio is carried out to first electric current；
The second voltage is converted into the second electric current, and the amplification of the second ratio is carried out to second electric current, described second
Ratio is identical or different with first ratio setting, by controlling current mirror ratio that can generate described in different multiples
Difference；
Electric current between amplified first electric current and the second electric current is divided into 2N-MPart.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610183414.1A CN105590583B (en) | 2016-03-28 | 2016-03-28 | Gray scale voltage generation circuit, production method, driving circuit and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610183414.1A CN105590583B (en) | 2016-03-28 | 2016-03-28 | Gray scale voltage generation circuit, production method, driving circuit and display device |
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| CN105931609B (en) * | 2016-06-30 | 2018-11-23 | 深圳市华星光电技术有限公司 | Gray-scale intensity control method and device |
| CN110164387B (en) * | 2018-07-03 | 2024-02-27 | 合肥视涯技术有限公司 | Gamma voltage generating circuit, driving circuit and display device thereof |
| CN109348087B (en) * | 2018-11-23 | 2021-12-14 | 合肥鑫晟光电科技有限公司 | Correction method and correction device |
| CN110322852B (en) * | 2019-06-14 | 2020-10-16 | 深圳市华星光电技术有限公司 | Gamma voltage output circuit, step-down repairing method thereof and source driver |
| CN112908244B (en) * | 2021-02-24 | 2022-03-08 | 南京浣轩半导体有限公司 | Driving method and device of display element |
| CN114420033B (en) * | 2022-02-23 | 2024-01-16 | 深圳市爱协生科技股份有限公司 | Display driving chip, display device and full-screen electronic device |
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