CN106486071B - A kind of electric moistening display non-linear voltage amplitude gray modulation method and device thereof - Google Patents
A kind of electric moistening display non-linear voltage amplitude gray modulation method and device thereof Download PDFInfo
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- CN106486071B CN106486071B CN201611203102.9A CN201611203102A CN106486071B CN 106486071 B CN106486071 B CN 106486071B CN 201611203102 A CN201611203102 A CN 201611203102A CN 106486071 B CN106486071 B CN 106486071B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3433—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 light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices
- G09G3/348—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 light modulating elements actuated by an electric field and being other than liquid crystal devices and electrochromic devices based on the deformation of a fluid drop, e.g. electrowetting
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Abstract
The present invention relates to a kind of electric moistening display non-linear voltage amplitude gray scale rendition modulator approach and its devices, and this method is according to Electrowetting device relative luminance（Or aperture opening ratio）It is non-linear with driving voltage relation curve, the voltage of the nonlinear amplitude variation of the not equal increments of control generation and the voltage collective effect of line scanner output are in the non-polar fluid generation uniform luminance in two driving electrodes of electric moistening display pixel unit, making Electrowetting device pixel unit（Or aperture opening ratio）The contraction of variation, to realize that input gray level data export the effect of accurate target gray hierarchical modulation.The realization circuit device of the method for the present invention mainly includes：Main Control Unit, Data Input Interface unit, gradation data converter unit, column parallel data displacement latch controllers unit, D/A converter unit, linear voltage amplifier unit, line scanner unit, power supply unit etc..
Description
Technical field
The present invention relates to display technology field, in particular to a kind of electric moistening display non-linear voltage amplitude gray scale tune
Method and device thereof processed.
Background technique
In recent years, it is concerned reflection type display device due to the demand to display low-power consumption and outdoor reading,
Wherein there is a kind of Novel reflection-type electrowetting（Electrowetting also known as electricity are wet）（Electro Wetting Device, EWD）Display
Device, because it is to be shown based on showing under powering state to realization under the control of polar liquid so reflecting relative to others
Reaction speed is very fast for device, while being also able to achieve high brightness, high contrast, low energy consumption.But how on Electrowetting device
Display image even video is still greatly improved space.In order to realize the aobvious of image and video on electric moistening display
Show, it is necessary to Electrowetting device can be made to realize the display of gray scale.
The electric moistening display part structure that whole realization text, character, image and video are shown has segmentation and matrix form two
Kind：Segmentation structure is generally made of the segmentation electrode that a large area public electrode and each electrowetting unit are drawn, public
Electrode and segmentation electrode, which apply driving signal, can realize required display；And matrix type structure will generally constitute matrix unit
The upper/lower electrode of electrowetting display unit carries out extraction in parallel respectively by locating column locations, form row electrode and column be electric
Pole applies driving signal on row-column electrode respectively, it will be able to realize required display.Electrowetting device divides passive and active again
Driving, their main distinction are whether there is integrated thin-film transistor on each electrowetting unit（Thin Film
Transistor, TFT）, both displays are upper substantially similar in driving, but have the active device performance of integrated TFT excellent
In general passive device.Currently used gray scale modulation method has pulsewidth gray modulation and voltage-amplitude modulated common
In pulsewidth gray modulation technology, Electrowetting device is driven using pulse width signal corresponding with input image data.Often
In voltage-amplitude modulated technology, electrowetting device is driven using voltage amplitude signal corresponding with input image data
Part.But due to the display brightness of typical electric moistening display part（Or aperture opening ratio）It is nonlinear dependence between driving voltage
System, and general pulsewidth modulation and voltage-amplitude modulated are using generating after the time of increment at equal intervals or voltage drive device
Device brightness（Or aperture opening ratio）Increment is non-equally spaced（It is nonlinear）I.e. identical pulsewidth or voltage increment but no
To identical brightness gain, and obtain that gray modulation response quautity varies as a result, therefore using general pulse width tune
The reduction of the modulation of system and voltage amplitude accurately tonal gradation difficult to realize is shown, so as to cause the image ash for restoring display
The problems such as degree is not accurate, and image fault is serious.
Summary of the invention
In order to solve the above technical problems, the object of the present invention is to provide a kind of electric moistening display non-linear voltage amplitude ashes
Degree reduction modulator approach and its device.
A kind of electric moistening display non-linear voltage amplitude gray scale rendition modulator approach, which is characterized in that including：According to electricity
The non-linear of device relative luminance or aperture opening ratio and driving voltage relation curve is soaked, is converted using by general linear gradation data
For the gradation data transform method of nonlinear gray modulation, control generates the voltage and one for not waiting the nonlinear amplitude variation of increments
The voltage collective effect of line scanner unit output makes electrowetting in two driving electrodes of electric moistening display pixel unit
The non-polar fluid of device pixel unit generates contraction, realizes that input gray level data export accurate target gray hierarchical modulation.
Further, the voltage value of the nonlinear amplitude variation of the not equal increments by Electrowetting device threshold voltage to
The quantity of the difference of saturation voltage and realized tonal gradation codetermines.
Further, the general linear gradation data is transformed to the gradation data transform method packet of nonlinear gray modulation
Include following steps：Step S1：By experiment or existing experimental data obtain the Electrowetting device relative luminance to be driven or
Aperture opening ratio and driving voltage L-V relation curve, while determining the grayscale sum G that required driving electrowetting gray scale is shownALL, from institute
It calculates in the L-V relation curve of acquisition from threshold voltage VTHRequired maximum drive voltage is corresponded to maximum relative luminance aperture opening ratio
VMAXVoltage difference VD=VMAX-VTH, and the corresponding relative luminance of threshold voltage or aperture opening ratio L are calculated from L-V relation curveMINWith
The corresponding relative luminance of maximum drive voltage or aperture opening ratio LMAXBrightness or aperture opening ratio difference LD=LMAX-LMIN；Step S2：Using
Formula Δ L=LD/GALLIt calculates and realizes GALLThe relative luminance of grayscale or the increment Delta L of aperture opening ratio divide brightness according to increment Delta L
Corresponding grayscale, and according to relative luminance or aperture opening ratio and driving voltage relation curve, corresponding to the grayscale after being divided
Driving voltage V1~VGALL；Step S3：According to the digit B of D/A converter input data, calculates output analog voltage and quantify total rank
Number is 2B, in conjunction with the obtained voltage difference V of step S1D, the smallest incremental voltage of electrowetting modulation driving voltage can be calculated
It is worth Δ V=VD/（2B-1）；Step S4：The voltage V that step S2 is obtained1~VGALLIt is divided by respectively with Δ V, and round numbers part, this
A numerical value is exactly the non-linear voltage amplitude that each input original gray-scale data obtain after the processing of gradation data converter unit
The data of gray modulation；Step S5：With the transformed gradation data of step S4 output by D/A converter unit and linear electricity
The processing of pressure amplifier unit obtains the corresponding electric moistening display of general luma data accurately target gray scale.
Further, the institute is voltage according to Electrowetting device relative luminance or aperture opening ratio and driving voltage relation curve
Rise the non-polar fluid contraction phase or voltage declines the nonfluid expansionary phase.
A kind of electric moistening display non-linear voltage amplitude gray scale rendition modulates its device comprising Main Control Unit,
Data Input Interface unit, gradation data converter unit, column parallel data displacement latch controllers unit, D/A converter unit,
Linear voltage amplifier unit, line scanner unit and power supply unit；The Main Control Unit realizes electrowetting for completing
The programming Control of display non-linear voltage amplitude gray scale rendition modulation control circuit system；The Data Input Interface unit is used
In completion gradation data input control；The gradation data converter unit drives for realizing original gradation data to target gray
The transformation of D/A converter unit input data needed for voltage controls；The column parallel data displacement latch controllers unit is used for
It will simultaneously raw column data displacement latch be output on corresponding column by certain timing；The D/A converter unit for realizing two into
Conversion of the digital signal processed to corresponding analog voltage；The linear voltage amplifier unit amplifies D/A converter output voltage
Voltage amplitude value needed for driving Electrowetting device；The line scanner unit is used to generate needed for the scanning of Electrowetting device row
Voltage pulse signal；The power supply unit is powered to other unit modules.
Further, the gradation data converter unit realizes that the quantity of tonal gradation is 2 secondary number formulary.
Further, the gradation data converter unit in described device is by having the memory device, the FPGA that search table function
Module or the integrated circuit for having calculation function are constituted；The gradation data converter unit inputs most neighboring gradation grade two-by-two
The differences of data be the data of most adjacent gray levels two-by-two exported after gradation data converter unit transformation at equal intervals
There are following characteristics：First is that being not necessarily at equal intervals；Second is that its value is more than or equal to the difference of corresponding former input gray level level spacing；
Third is that all level spacing differences are presented non-linear variations, and it is non-with electric moistening display relative luminance and driving voltage
Linear relationship is consistent.
Further, the column parallel data displacement latch controllers unit in described device is by having 8 parallel-by-bits displacement lock
Storage, FPGA module or the integrated circuit for having corresponding function are constituted, for pressing certain timing for simultaneously raw column data displacement lock
It deposits and is output on corresponding column.
Further, the line scanner unit in described device is by address decoder and pulse amplifier circuit or by going
Integrated device is scanned to constitute.
Further, the power supply unit is made of multivoltage output switch power source or linear voltage stabilization potential circuit.
Compared with prior art, present invention adds include to be transformed to non-linear ash using by general linear gradation data
The non-linear voltage amplitude gray modulation system for spending the gradation data converter unit circuit system of the data of modulation, makes it possible to use
General gradation data driving electric moistening display and the electrowetting display effect for obtaining accurate tonal gradation, can dramatically improve
The image restoring ability of Electrowetting device realizes more preferably display image quality.
Detailed description of the invention
Fig. 1 is typical electric moistening display relative luminance and driving voltage graph of relation；
Fig. 2 is that non-linear voltage gray modulation grayscale provided in an embodiment of the present invention divides and column driving voltage relational graph；
Fig. 3 is electric moistening display non-linear voltage amplitude gray modulate circuit apparatus system provided in an embodiment of the present invention
Block diagram.
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the invention.
The present invention provides a kind of electric moistening display non-linear voltage amplitude gray scale rendition modulator approach and its device.
This approach includes the following steps：According to Electrowetting device relative luminance（Or aperture opening ratio）With driving voltage relation curve
It is non-linear, control generate the nonlinear amplitude variation of not equal increments voltage and line scanner output voltage collective effect in
In two driving electrodes of electric moistening display pixel unit, generate the non-polar fluid of Electrowetting device pixel unit uniform
Brightness（Or aperture opening ratio）The contraction of variation, to realize that input gray level data export the effect of accurate target gray hierarchical modulation.
The present embodiment provides a kind of electric moistening display non-linear voltage amplitude gray scale rendition modulator approach and its devices, former
The non-linear voltage amplitude gray modulation data that beginning luma data converts include the following steps：
Step S1：The Electrowetting device relative luminance to be driven is obtained by experiment or existing experimental data（Or it opens
Mouth rate）With driving voltage（L-V）Relation curve, while determining the grayscale sum G that required driving electrowetting gray scale is shownALL, from institute
It calculates in the L-V relation curve of acquisition from threshold voltage VTHTo maximum relative luminance（Aperture opening ratio）Corresponding required maximum drive electricity
Pressure（Saturation voltage）VMAXVoltage difference VD=VMAX-VTH, and the corresponding relative luminance of threshold voltage is calculated from L-V relation curve
（Aperture opening ratio）LMINAnd maximum drive voltage（Saturation voltage）Corresponding relative luminance（Aperture opening ratio）LMAXBrightness（Or aperture opening ratio）
Difference LD=LMAX-LMIN；
Step S2：Using formula Δ L=LD/GALLIt calculates and realizes GALLThe relative luminance of grayscale or the increment Delta L of aperture opening ratio,
The corresponding grayscale of brightness is divided according to increment Delta L, and according to relative luminance or aperture opening ratio and driving voltage relation curve, is drawn
Driving voltage V corresponding to grayscale after point1~VGALL；
Specific embodiment is：Using formula Δ L=LD/GALLIt calculates and realizes GALLThe relative luminance of grayscale（Or aperture opening ratio）'s
Increment Delta L, by methods such as mappings by L-V relation curve from the corresponding relative luminance of threshold voltage（Aperture opening ratio）LMINTo maximum
Driving voltage（Saturation voltage）Corresponding relative luminance（Aperture opening ratio）LMAXBrightness（Or aperture opening ratio）G is drawn by Δ L incrementALLItem
The straight line parallel with voltage axis, and intersect respectively with L-V relation curve, then G is drawn from crosspoint as starting point againALLItem
The straight line parallel with relative luminance axis, and intersect respectively with voltage axis；Using threshold voltage as new Voltage Reference zero point, respectively
It is successively read and the voltage value of voltage axis intersecting parallel line crosspoint, is denoted as V respectively1, V2... ..., VGALL；
Step S3：According to the digit B of D/A converter input data, calculating output analog voltage to quantify total order is 2B,
In conjunction with the obtained voltage difference V of step S1D, can calculate electrowetting modulation driving voltage smallest incremental voltage value Δ V=
VD/（2B-1）；
Step S4：The voltage V that step S2 is obtained1~VGALLIt is divided by respectively with Δ V, and round numbers part, this numerical value is just
It is the non-linear voltage amplitude gray modulation that each input original gray-scale data obtain after the processing of gradation data converter unit
Data；
Step S5：Amplified with the transformed gradation data of step S4 output by D/A converter unit and linear voltage
The processing of device unit can be obtained by the corresponding electric moistening display of general luma data accurately target gray scale.
In the present embodiment, it will be assumed that the electrowetting display screen for the display of being driven is that lattice matrix is monochromatic or colored
Screen, resolution ratio are 64 column and 64 rows, and required driving voltage polarity is negative to arrange positive row.Electrowetting display screen typical case's phase is measured simultaneously
To brightness with driving voltage relation curve as shown in Figure 1, simultaneously we select current common electronics paper display image grayscale for
16 grayscale, the S1 ~ S4 step for the non-linear voltage amplitude gray modulation data that then we convert according to original gray-scale data
Suddenly, it is as shown in Figure 2 with column driving voltage relational graph to obtain the division of non-linear voltage gray modulation grayscale.
In the present embodiment, the grayscale sum G that driving electrowetting gray scale is shown needed for determiningALL=16, from L-V obtained
It calculates in relation curve from threshold voltage VTHTo maximum relative luminance（Aperture opening ratio）Corresponding required maximum drive voltage（Saturation electricity
Pressure）VMAXVoltage difference VD=VMAX-VTH=37.50-20.35=17.15V, and calculate threshold voltage from L-V relation curve and correspond to
Relative luminance（Aperture opening ratio）LMINAnd maximum drive voltage（Saturation voltage）Corresponding relative luminance（Aperture opening ratio）LMAXBrightness
（Or aperture opening ratio）Difference LD=LMAX-LMIN=61.25-39.17=22.08；Set digit B=8 of D/A converter input data, meter
Calculating output analog voltage to quantify total order is 2B-1=28- 1=255, minimum the increasing of electrowetting modulation driving voltage can be calculated
Measure voltage value Δ V=VD/（2B-1）=17.15/255=0.067254902V；Using threshold voltage as new Voltage Reference zero point, point
It is not successively read and the voltage value of voltage axis intersecting parallel line crosspoint, is denoted as V respectively1, V2... ..., VGALL, original 4bits ash
Order is according to, 16 voltage values such as table 1 third column shown in numerical value as shown in table 1 with the non-linear luma data transformation relation of 8bits；
The voltage V that will be obtained1~VGALLIt is divided by respectively with Δ V, and round numbers part, the data of 16 non-linear voltage amplitude gray modulations
Binary system and the decimal value numerical value as shown in the column of table 1 the 4th.First row shown in table 1 and the 4th column binary data are by conduct
The master data for the non-linear voltage amplitude gray modulation data that original gray-scale data convert.
Table 1
On the basis of non-linear voltage amplitude gray modulation method described above, provided by the present invention is to realize circuit
Device scheme mainly includes：Main Control Unit, Data Input Interface unit, gradation data converter unit, column parallel data are moved
Position latch controllers unit, D/A converter unit, linear voltage amplifier unit, line scanner unit, power supply unit etc., this
The electric moistening display non-linear voltage amplitude gray modulate circuit apparatus system block diagram that a little circuit units are constituted, as shown in Figure 3.
The Main Control Unit realizes electric moistening display non-linear voltage amplitude gray scale rendition modulation control circuit system for completing
The programming Control of system；The Data Input Interface unit is for completing gradation data input control；The gradation data transformation is single
Member controls for realizing the transformation of D/A converter unit input data needed for original gradation data to target gray driving voltage；
The column parallel data displacement latch controllers unit is output to accordingly for latching simultaneously raw column data displacement by certain timing
Column on；The D/A converter unit is for realizing binary digital signal to the conversion of corresponding analog voltage；The linear electricity
Voltage amplitude value needed for pressing amplifier unit that D/A converter output voltage is amplified driving Electrowetting device；The row scanning
Voltage pulse signal needed for device unit is used to generate the scanning of Electrowetting device row；The power supply unit is supplied to other unit modules
Electricity.
Main Control Unit by singlechip CPU, embedded type CPU or computer CPU etc. with programming Control function, I
Select STM32 series monolithic, for complete realize electric moistening display non-linear voltage amplitude gray scale rendition modulation control
The programming Control of circuit system completes Data Transmission Controlling and timing control etc..Data Input Interface unit is by having caching function
The Digital Logical Circuits of energy or latch function is constituted, we select HC245 eight bit data buffer chip, for completing grey
It is controlled according to input-buffer, according to the case for this embodiment, the gradation data of input is 4, and input timing is complete by STM32 single-chip microcontroller
At.Gradation data converter unit is by having the memory device for searching table function, fpga chip or having the integrated of calculation function
Circuit is constituted, we select Altera FPGA MAX family chip EPM7032SC7, write look-up table using Verilog language
Program controls for realizing the transformation of D/A converter input data needed for original gradation data to target gray driving voltage,
The FPGA look-up table means constructed in the present embodiment meet the input of 4 bit binary datas, according to 1 first row of table and the 4th column pair
The eight-digit binary number data output answered, for example inputting 4 bits is that " 0000 " then exports 8 bits and is
" 00000000 ", 4 bits of input are that " 0001 " then to export 8 bits be " 00100010 ", input 4 binary systems
Number is that " 0010 " then to export 8 bits be " 00101000 " etc., traverses the feelings of 16 all 4 binary systems
Condition.The present embodiment selects current common electronics paper display image grayscale for 16 grayscale, that is, the original gray-scale inputted be 4 two into
Number processed, it exports the number as gradation data converter unit by HC245 eight bit data buffer chip Data Input Interface unit
It is then inputted as the data of next circuit unit D/A converter unit according to 8 data of input, and data conversion unit output.
Since this drive circuit system column direction has 64 tunnels, it is therefore necessary to design column parallel data displacement latch controllers by
The 64 road column datas of a line are respectively allocated to the D/A converter on each road.Column parallel data shifts latch controllers unit by having 8
Parallel-by-bit displacement latch, FPGA module or the integrated circuit for having corresponding function are constituted, we select 7 Altera
FPGA Cyclone family chip EP1C6Q240C8 is used to be output to simultaneously raw column data displacement latch by certain timing corresponding
On column, is write using Verilog language and be able to achieve sequence 8 bit parallel datas input, then cascade output phase respectively by displacement
The 8 nonlinear amplitude data that should be arranged input the D/A converter unit of respective column respectively.D/A converter unit is by with digital-to-analogue
The integrated circuit of conversion function is constituted, we select 8 D/A chip DAC0832, arrive for realizing 8 bit binary number signals
The conversion of corresponding analog voltage.Linear voltage amplifier unit is by operational amplifier and peripheral circuit or integrated voltage amplifier
Part is constituted, we select LM324 op-amp, and maximum output voltage is used to amplify D/A converter output voltage and drive
Voltage amplitude value needed for dynamic Electrowetting device, in addition peripheral resistor constitutes the proportion operational amplifier with voltage gain,
When D/A converter inputs 8 maximum binary number " 11111111 ", the analog signal of D/A converter output passes through the ratio
The maximum voltage value of operational amplifier amplification output is set as "+17.15V ", and the column electrode drive electricity as Electrowetting device
Pressure.An above-described D/A converter and a linear voltage amplifier constitute the column voltage processing circuit on 1 tunnel, electrowetting
Display screen shares 64 road column driving electrodes, it is therefore desirable to 64 sets of such column voltage processing circuits.Line scanner unit is by address
Decoder and pulse amplifier circuit are made of row scanning integrated device, for generating needed for the scanning of Electrowetting device row
Voltage pulse signal, we select Altera FPGA MAX family chip EPM7128SC7 and with negative voltage enlarging functions
Pulse integrated amplifier ULN2803 chip is constituted, and the operating voltage of the operating die is chosen to be the threshold voltage of Electrowetting device
It is set as -23.35V, the row driving electrodes of 64 rows is shared according to electrowetting display screen, it is therefore desirable to is compiled using Verilog language
The input of 6-64 decoder module i.e. 6 bit address signals is write, which is scanned by STM32 single-chip microcontroller according to image data
Timing generates and is input to the address signal input terminal of EPM7128SC7 chip, 64 tunnel a line period effective impulses scanning of generation
Pulse output, and be separately input to carry out voltage amplification in 8 ULN2803 integrated amplifier chips, it finally will be amplified negative
The effective scanning pulse of voltage is connect with 64 tunnel electrowetting display screen line electrodes.Power supply unit by multivoltage output switch power source or
Person's linear voltage stabilization potential circuit is constituted, and required operating voltage is provided for the modules for circuit device, and main includes number
Voltage needed for word logic circuit voltage, linear voltage amplifier unit, voltage needed for line scanner unit etc..
It should be noted that the electrowetting display screen assumed in the embodiment of the present invention is monochrome display, if driven
Dynamic electric moistening display be colorful display screen when, above-described circuit implementation process can still use, only for
For colour circuit, it is also necessary to make other two sets of identical column electrode drive circuits, core content and institute above us again
The monochromatic drive circuit system stated is completely the same, only has the binary system gradation data of 3 roads colour respectively as 3 roadbed colors at this time
The input of column data, the 64 road column driving pulses output of each primary colours are respectively connected to the electrowetting display screen of corresponding color, in this way
It can realize the display of colored precisely non-linear voltage magnitude image.
It should be noted that the resolution ratio for the electrowetting display screen that the embodiment of the present invention is assumed is 64 × 64 dot matrix, this
Inventive method is also fully applicable for various resolution ratio display screens lower than it or higher than it in fact, at this time required Drive of row and column
Number does corresponding increase and decrease.If after reaching certain resolution certainly, required main controller CPU just needs to select higher
The processor of performance smoothly could handle and control this circuit system, but whether using which kind of chip, core of the invention
Idea will not change.
It should be noted that the electrowetting display screen that the embodiment of the present invention is assumed is passive drive display screen, in fact originally
The method and circuit device of invention are also applied for the electrowetting display screen of active matrix driving, and method of the invention and circuit device are complete
Monochromatic and color active electrowetting display screen can directly be applied to, same desired effect will be obtained.
Each section circuit module described above generates under the uniformly coordinated control of monolithic chip and realizes a series of electrowettings
Display also original image shows required row-column electrode drive voltage signal, finally can realize 16 on electrowetting display screen
The display of gray scale image, and reach the reproduction of precise image gray scale, greatly improve the display effect of image.
It should be noted that electrowetting also known as electricity are wet, electric moistening display gray scale modulation method is same in the present invention
Sample is also applied for electric wet-type display.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of electric moistening display non-linear voltage amplitude gray scale rendition modulator approach, which is characterized in that including：According to electricity profit
Wet device relative luminance or aperture opening ratio are non-linear with driving voltage relation curve, are transformed to using by general linear gradation data
The gradation data transform method of nonlinear gray modulation, control generate the voltage and a line for not waiting the nonlinear amplitude variation of increments
The voltage collective effect of scanner unit output makes electrowetting device in two driving electrodes of electric moistening display pixel unit
The non-polar fluid of part pixel unit generates contraction, realizes that input gray level data export accurate target gray hierarchical modulation；
The non-linear voltage amplitude gray modulation data that original gray-scale data convert include the following steps：
Step S1：By experiment or existing experimental data obtain the Electrowetting device relative luminance to be driven or aperture opening ratio with
Driving voltage L-V relation curve, while determining the grayscale sum G that required driving electrowetting gray scale is shownALL, from L-V obtained
It calculates in relation curve from threshold voltage VTHRequired maximum drive voltage V is corresponded to maximum relative luminance aperture opening ratioMAXVoltage
Difference VD=VMAX-VTH, and the corresponding relative luminance of threshold voltage or aperture opening ratio L are calculated from L-V relation curveMINAnd maximum drive
The corresponding relative luminance of voltage or aperture opening ratio LMAXBrightness or aperture opening ratio difference LD=LMAX-LMIN；
Step S2：Using formula Δ L=LD/GALLIt calculates and realizes GALLThe relative luminance of grayscale or the increment Delta L of aperture opening ratio, according to increasing
It measures Δ L and divides the corresponding grayscale of brightness, and according to relative luminance or aperture opening ratio and driving voltage relation curve, after being divided
Driving voltage V corresponding to grayscale1~VGALL；
Step S3：According to the digit B of D/A converter input data, calculating output analog voltage to quantify total order is 2B, in conjunction with
The obtained voltage difference V of step S1D, smallest incremental voltage value Δ V=V of electrowetting modulation driving voltage can be calculatedD/
（2B-1）；
Step S4：The voltage V that step S2 is obtained1~VGALLIt is divided by respectively with Δ V, and round numbers part, this numerical value is exactly every
The number for the non-linear voltage amplitude gray modulation that a input original gray-scale data obtain after the processing of gradation data converter unit
According to；
Step S5：Pass through D/A converter unit and linear voltage amplifier list with the transformed gradation data of step S4 output
The processing of member obtains the corresponding electric moistening display of general luma data accurately target gray scale.
2. electric moistening display non-linear voltage amplitude gray scale rendition modulator approach according to claim 1, feature exist
In：The voltage value of the nonlinear amplitude variation of the not equal increments by Electrowetting device threshold voltage to saturation voltage difference
It is codetermined with the quantity of realized tonal gradation.
3. electric moistening display non-linear voltage amplitude gray scale rendition modulator approach according to claim 1, feature exist
In：It is described to rise non-polar fluid receipts according to Electrowetting device relative luminance or aperture opening ratio and driving voltage relation curve for voltage
Contracting stage or voltage decline the nonfluid expansionary phase.
4. a kind of electricity using electric moistening display non-linear voltage amplitude gray scale rendition modulator approach as described in claim 1
Soak display non-linear voltage amplitude gray scale rendition modulating device, it is characterised in that：It is inputted including Main Control Unit, data
Interface unit, gradation data converter unit, column parallel data shift latch controllers unit, D/A converter unit, linear voltage
Amplifier unit, line scanner unit and power supply unit；The Main Control Unit realizes that electric moistening display is non-for completing
The programming Control of linear voltage amplitude gray scale rendition modulation control circuit system；The Data Input Interface unit is for completing ash
Degree is according to input control；The gradation data converter unit is for realizing needed for original gradation data to target gray driving voltage
The transformation of D/A converter unit input data controls；The column parallel data displacement latch controllers unit is used for by a timing
Sequence will be simultaneously output on corresponding column in raw column data displacement latch；The D/A converter unit is for realizing binary digit letter
Number to corresponding analog voltage conversion；D/A converter output voltage is amplified driving electricity profit by the linear voltage amplifier unit
Voltage amplitude value needed for wet device；Voltage pulse needed for the line scanner unit is used to generate the scanning of Electrowetting device row
Signal；The power supply unit is powered to other unit modules；
Gradation data converter unit in described device is by having the memory device for searching table function, FPGA module or having fortune
The integrated circuit for calculating function is constituted；
The most difference of the data of neighboring gradation grade is at equal intervals, through the gray scale two-by-two for the gradation data converter unit input
There are following characteristics for the data of the most adjacent gray levels two-by-two exported after data conversion unit transformation：First is that between being not necessarily etc.
Every；Second is that its value is more than or equal to the difference of corresponding former input gray level level spacing；Third is that all level spacing differences presentations are non-thread
Property variation relation, and it is consistent with the non-linear relation of driving voltage with electric moistening display relative luminance.
5. electric moistening display non-linear voltage amplitude gray scale rendition modulating device according to claim 4, feature exist
In：The gradation data converter unit realizes that the quantity of tonal gradation is 2 secondary number formulary.
6. electric moistening display non-linear voltage amplitude gray scale rendition modulating device according to claim 4, feature exist
In：In described device column parallel data displacement latch controllers unit by have 8 parallel-by-bits displacement latch, FPGA module or
The integrated circuit that person has corresponding function is constituted, for that simultaneously raw column data displacement latch will be output to corresponding column by certain timing
On.
7. electric moistening display non-linear voltage amplitude gray scale rendition modulating device according to claim 4, feature exist
In：Line scanner unit in described device scans integrated device structure by address decoder and pulse amplifier circuit or by row
At.
8. electric moistening display non-linear voltage amplitude gray scale rendition modulating device according to claim 4, feature exist
In：The power supply unit is made of multivoltage output switch power source or linear voltage stabilization potential circuit.
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| CN107680540B (en) * | 2017-10-18 | 2019-06-07 | 福州大学 | A kind of colored electroweting display color bearing calibration and its device |
| CN107799074B (en) * | 2017-12-15 | 2019-10-15 | 福州大学 | A kind of drive control method and device realizing electric moistening display colour and showing |
| CN107808643B (en) * | 2017-12-15 | 2019-12-17 | 福州大学 | Color display method and device of electrowetting display |
| CN108470549A (en) * | 2018-05-22 | 2018-08-31 | 深圳市国华光电科技有限公司 | A kind of display system and method based on electrowetting Electronic Paper |
| CN108806615B (en) * | 2018-05-25 | 2020-09-01 | 福州大学 | Novel pixel data encoding method and device for electrowetting display |
| CN108766370B (en) * | 2018-06-11 | 2024-05-17 | 深圳市国华光电科技有限公司 | Electrowetting driving system and control method thereof |
| CN114898716B (en) * | 2022-05-12 | 2023-10-27 | 福州大学 | Method for high gray scale electrowetting display device based on cooperation of voltage modulation and time modulation |
| CN114944137A (en) * | 2022-05-25 | 2022-08-26 | 福州大学 | Modulation chip driving method capable of multiplying gray scale of electrowetting electronic paper display |
| CN114898718B (en) * | 2022-06-10 | 2023-08-25 | 福州大学 | Real-time color conversion method for color electrowetting electronic paper |
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