CN106486071A - A kind of electric moistening display non-linear voltage amplitude gray modulation method and its device - Google Patents
A kind of electric moistening display non-linear voltage amplitude gray modulation method and its device Download PDFInfo
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- CN106486071A CN106486071A CN201611203102.9A CN201611203102A CN106486071A CN 106486071 A CN106486071 A CN 106486071A CN 201611203102 A CN201611203102 A CN 201611203102A CN 106486071 A CN106486071 A CN 106486071A
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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
Abstract
The present invention relates to a kind of electric moistening display non-linear voltage amplitude gray scale rendition modulator approach and its device, the method is according to Electrowetting device relative luminance（Or aperture opening ratio）Non-linear with driving voltage relation curve, control the voltage collective effect producing the voltage of nonlinear amplitude change not waiting increment and line scanner output on two drive electrodes of electric moistening display pixel cell, make the non-polar fluid of Electrowetting device pixel cell produce uniform luminance（Or aperture opening ratio）The contraction of change, thus realize the effect of input gray level data output accurate target gray hierarchical modulation.The circuit arrangement of realizing of the inventive method mainly includes：Main Control Unit, Data Input Interface unit, gradation data converter unit, row parallel data displacement latch controllers unit, D/A converter unit, linear voltage amplifier unit, line scanner unit, power subsystem etc..
Description
Technical field
The present invention relates to display technology field, adjust particularly to a kind of electric moistening display non-linear voltage amplitude gray scale
Method processed and its device.
Background technology
In recent years, reflection type display device is made to receive much concern 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 moistening）（Electro Wetting Device, EWD）Display
Device, because it is based on realizing under the control to polar liquid under powering state showing, so with respect to other reflective displays
For device, response speed is very fast, also enables high brightness, high-contrast, low energy consumption simultaneously.But how on Electrowetting device
Display image or even video still have greatly improved space.In order to the aobvious of image and video is realized 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 word, character, image and video show has segmentation and matrix form two
Kind：Segmentation structure is typically made up of the segmentation electrode that a large area public electrode and each electrowetting unit are drawn, public
Electrode and segmentation electrode apply drive signal and just can realize required display；And matrix type structure typically will constitute matrix unit
The upper/lower electrode of electrowetting display unit carry out extraction in parallel respectively by residing column locations, form row electrode and row electricity
Pole, applies drive signal respectively it becomes possible to realize required display on row-column electrode.Electrowetting device divides passive and active again
Drive, they differ primarily in that whether there is integrated thin-film transistor on each electrowetting unit（Thin Film
Transistor, TFT）, both display are substantially similar on driving, but the active device performance with integrated TFT is excellent
In general passive device.The gray scale modulation method commonly used at present has pulsewidth gray modulation and voltage-amplitude modulated to commonly use
In pulsewidth gray modulation technology, Electrowetting device is driven using the pulse width signal corresponding with input image data.Often
In voltage-amplitude modulated technology, electrowetting device is driven using the voltage amplitude signal corresponding with input image data
Part.But the display brightness due to typical electric moistening display part（Or aperture opening ratio）It is nonlinear dependence and driving voltage between
System, and general pulsewidth modulation and voltage-amplitude modulated are using generation after the time of increment at equal intervals or voltage drive device
Device brightness（Or aperture opening ratio）Increment is non-equally spaced（Nonlinear）I.e. identical pulsewidth or voltage increment but no
To identical brightness gain, and obtain the result that gray modulation response quautity varies, therefore adopt general pulse width to adjust
The reduction of the modulation accurately tonal gradation difficult to realize of system and voltage amplitude shows, thus leading to the image ash being reduced display
Degree is accurate, the problems such as image fault is serious.
Content of the invention
For solving above-mentioned technical problem, it is an object of the invention to provide a kind of electric moistening display non-linear voltage amplitude is grey
Degree reduction modulator approach and its device.
A kind of electric moistening display non-linear voltage amplitude gray scale rendition modulator approach is it is characterised in that include：According to electricity
Moistening device relative luminance or aperture opening ratio are non-linear with driving voltage relation curve, convert using by general linear gradation data
For the gradation data alternative approach of nonlinear gray modulation, control the voltage and one producing the nonlinear amplitude change not waiting increment
The voltage collective effect of line scanner unit output, on two drive electrodes of electric moistening display pixel cell, makes electrowetting
The non-polar fluid of device pixel unit produces and shrinks, and realizes input gray level data output accurate target gray hierarchical modulation.
Further, described not wait increment nonlinear amplitude change voltage value by Electrowetting device threshold voltage to
The difference of saturation voltage is together decided on the quantity of realized tonal gradation.
Further, described general linear gradation data is transformed to the gradation data alternative approach bag of nonlinear gray modulation
Include following steps：Step S1：By experiment or existing experimental data obtain Electrowetting device relative luminance to be driven or
Aperture opening ratio and driving voltage L-V relation curve, determine the required GTG driving electrowetting gray scale to show sum G simultaneouslyALL, from institute
Calculate from threshold voltage V in the L-V relation curve obtainingTHTo the corresponding required maximum drive voltage of maximum relative luminance aperture opening ratio
VMAXVoltage difference VD=VMAX-VTH, and calculate the corresponding relative luminance of threshold voltage or aperture opening ratio L 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/GALLG is realized in calculatingALLThe relative luminance of GTG or increment Delta L of aperture opening ratio, divide brightness according to increment Delta L
Corresponding GTG, and according to relative luminance or aperture opening ratio and driving voltage relation curve, corresponding to the GTG after being divided
Driving voltage V1~VGALL；Step S3：According to digit B of D/A converter input data, calculate output analog voltage and quantify total rank
Number is 2B, in conjunction with the voltage difference V obtained by step S1D, the smallest incremental voltage that electrowetting modulates driving voltage can be calculated
Value Δ V=VD/（2B-1）；Step S4：The voltage V that step S2 is obtained1~VGALLIt is divided by with Δ V respectively, and round fractional part, this
Individual numerical value is exactly the non-linear voltage amplitude that each input original gray-scale data obtains after the process of gradation data converter unit
The data of gray modulation；Step S5：With the gradation data after the conversion of step S4 output through D/A converter unit and linearly electric
The process of pressure amplifier unit obtains general luma data corresponding electric moistening display accurately target gray scale.
Further, described institute is voltage according to Electrowetting device relative luminance or aperture opening ratio with 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, it include Main Control Unit,
Data Input Interface unit, gradation data converter unit, row parallel data displacement latch controllers unit, D/A converter unit,
Linear voltage amplifier unit, line scanner unit and power subsystem；Described Main Control Unit is used for completing to realize electrowetting
The programming Control of display non-linear voltage amplitude gray scale rendition modulation control circuit system；Described Data Input Interface unit is used
Control in completing gradation data input；Described gradation data converter unit is used for realizing original gradation data to target gray driving
The conversion of D/A converter unit input data needed for voltage controls；Described row parallel data displacement latch controllers unit is used for
Simultaneously raw column data displacement will latch output by certain sequential to corresponding arranging；Described D/A converter unit is used for realizing two entering
Digital signal processed is to the conversion of corresponding analog voltage；D/A converter output voltage is amplified by described linear voltage amplifier unit
Drive the voltage amplitude value needed for Electrowetting device；Described line scanner unit is used for producing needed for the scanning of Electrowetting device row
Voltage pulse signal；Described power subsystem is powered to other unit modules.
Further, the quantity that described gradation data converter unit realizes tonal gradation is 2 secondary number formulary.
Further, the gradation data converter unit in described device is by memory device, the FPGA with lookup table function
Module or the integrated circuit composition possessing calculation function；Described gradation data converter unit input neighboring gradation grade two-by-two
Data difference be at equal intervals, through described gradation data converter unit conversion after output adjacent gray levels two-by-two data
There are following characteristics：One is to be not necessarily at equal intervals；Two is the difference that its value is more than or equal to corresponding former input gray level level spacing；
Three is that all level spacing differences assume non-linear variation, and non-with electric moistening display relative luminance and driving voltage
Linear relationship is consistent.
Further, the row parallel data displacement latch controllers unit in described device is locked by possessing 8 parallel-by-bit displacements
Storage, FPGA module or the integrated circuit composition possessing corresponding function, for will simultaneously be locked by certain sequential in raw column data displacement
Deposit output to corresponding row.
Further, the line scanner unit in described device is by address decoder and pulse amplifier circuit or by going
Scanning integrated device is constituted.
Further, described power subsystem is made up of multivoltage output switch power source or linear voltage stabilization potential circuit.
Compared with prior art, it is transformed to non-linear ash present invention adds including using by general linear gradation data
The non-linear voltage amplitude gray modulation system of the gradation data converter unit Circuits System of data of degree modulation, enabling use
General gradation data drives electric moistening display to obtain the electrowetting display effect of accurate tonal gradation, can dramatically improve
The image restoring ability of Electrowetting device, realizes more excellent display image quality.
Brief description
Fig. 1 is typical electric moistening display relative luminance and driving voltage graph of relation；
Fig. 2 is that non-linear voltage gray modulation GTG provided in an embodiment of the present invention divides and row driving voltage graph of a relation；
Fig. 3 is electric moistening display non-linear voltage amplitude gray modulate circuit apparatus system frame provided in an embodiment of the present invention
Figure.
Specific embodiment
Below in conjunction with accompanying drawing, the principle of the present invention and feature are described, example is served only for explaining the present invention, and
Non- for limiting the scope of the present invention.
The present invention provides a kind of electric moistening display non-linear voltage amplitude gray scale rendition modulator approach and its device.
The method comprises the following steps：According to Electrowetting device relative luminance（Or aperture opening ratio）With driving voltage relation curve
Non-linear, control the voltage collective effect of the voltage and line scanner output producing the nonlinear amplitude change not waiting increment in
On two drive electrodes of electric moistening display pixel cell, the non-polar fluid of Electrowetting device pixel cell is made to produce uniformly
Brightness（Or aperture opening ratio）The contraction of change, thus realize the effect of input gray level data output 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 device, former
The non-linear voltage amplitude gray modulation data that the conversion of beginning luma data obtains comprises the following steps：
Step S1：Electrowetting device relative luminance to be driven is obtained by experiment or existing experimental data（Or aperture opening ratio）
With driving voltage（L-V）Relation curve, determines the required GTG driving electrowetting gray scale to show sum G simultaneouslyALL, from being obtained
L-V relation curve in calculate from threshold voltage VTHTo maximum relative luminance（Aperture opening ratio）Corresponding required maximum drive voltage
（Saturation voltage）VMAXVoltage difference VD=VMAX-VTH, and calculate the corresponding relative luminance of threshold voltage from L-V relation curve（Open
Mouth rate）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/GALLG is realized in calculatingALLThe relative luminance of GTG or increment Delta L of aperture opening ratio, according to
Increment Delta L divides the corresponding GTG of brightness, and according to relative luminance or aperture opening ratio and driving voltage relation curve, after being divided
The driving voltage V corresponding to GTG1~VGALL；
Specific embodiment is：Using formula Δ L=LD/GALLG is realized in calculatingALLThe relative luminance of GTG（Or aperture opening ratio）Increment
Δ L, by methods such as mappings by L-V relation curve from the corresponding relative luminance of threshold voltage（Aperture opening ratio）LMINTo maximum drive
Voltage（Saturation voltage）Corresponding relative luminance（Aperture opening ratio）LMAXBrightness（Or aperture opening ratio）Draw G by Δ L incrementALLBar and electricity
The parallel straight line of pressure amount axle, and intersect with L-V relation curve respectively, then draw G from joining as starting point againALLBar and phase
The straight line parallel to luminance axis, and intersect with voltage axis respectively；Using threshold voltage as new Voltage Reference zero point, difference is successively
Read the magnitude of voltage with voltage axis intersecting parallel line joining, be designated as V respectively1, V2... ..., VGALL；
Step S3：According to digit B of D/A converter input data, calculate output analog voltage to quantify total exponent number is 2B, in conjunction with
Voltage difference V obtained by step S1D, the smallest incremental magnitude of voltage Δ V=V that electrowetting modulates driving voltage can be calculatedD/
（2B-1）；
Step S4：The voltage V that step S2 is obtained1~VGALLIt is divided by with Δ V respectively, and rounds fractional part, this numerical value is exactly every
The number of the non-linear voltage amplitude gray modulation that individual input original gray-scale data obtains after the process of gradation data converter unit
According to；
Step S5：With the gradation data after the conversion of step S4 output through D/A converter unit and linear voltage amplifier list
The process of unit can be obtained by general luma data corresponding electric moistening display accurately target gray scale.
In the present embodiment it will be assumed that the electrowetting display screen of display to be driven is that lattice matrix is monochromatic or colored
Screen, resolution is 64 row and 64 row, and required driving voltage polarity is that row just row is negative.Record this electrowetting display screen typical case's phase simultaneously
To brightness with driving voltage relation curve as shown in figure 1, we select the current common electronicses paper display gradation of image to be simultaneously
16 GTGs, S1 ~ S4 step of the non-linear voltage amplitude gray modulation data that then we obtain according to the conversion of original gray-scale data
Suddenly, obtain the division of non-linear voltage gray modulation GTG as shown in Figure 2 with row driving voltage graph of a relation.
In the present embodiment, determine the required GTG driving electrowetting gray scale to show sum GALL=16, from the L-V being obtained
Calculate 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 correspondence from L-V relation curve
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
Calculate output analog voltage to quantify total exponent number is 2B-1=28- 1=255, can calculate the minimum increasing that electrowetting modulates driving voltage
Amount magnitude of voltage 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 the magnitude of voltage with voltage axis intersecting parallel line joining, be designated as V respectively1, V2... ..., VGALL, original 4bits ash
According to 8bits non-linear luma data transformation relation as shown in table 1,16 magnitude of voltage such as tables 1 the 3rd arrange shown numerical value to exponent number；
By the voltage obtaining V1~VGALLIt is divided by with Δ V respectively, and round fractional part, the data of 16 non-linear voltage amplitude gray modulation
Binary system and the decimal value such as numerical value shown in table 1 the 4th row.First row shown in table 1 and the 4th row binary data using as
The master data of the non-linear voltage amplitude gray modulation data that the conversion of original gray-scale data obtains.
Table 1
On the basis of the above non-linear voltage amplitude gray modulation method, provided by the present invention is to realize circuit arrangement
Scheme mainly includes：Main Control Unit, Data Input Interface unit, gradation data converter unit, row parallel data displacement lock
Memory controller unit, D/A converter unit, linear voltage amplifier unit, line scanner unit, power subsystem etc., these electricity
The electric moistening display non-linear voltage amplitude gray modulate circuit apparatus system block diagram that road unit is constituted, as shown in Figure 3.Described
Main Control Unit is used for completing to realize electric moistening display non-linear voltage amplitude gray scale rendition modulation control circuit system
Programming Control；Described Data Input Interface unit is used for completing gradation data input control；Described gradation data converter unit is used
Control in the conversion realizing original gradation data to D/A converter unit input data needed for target gray driving voltage；Described
Row parallel data displacement latch controllers unit arranges accordingly for latching to export to arrive by simultaneously raw column data displacement by certain sequential
On；Described D/A converter unit is used for realizing binary digital signal to the conversion of corresponding analog voltage；Described linear voltage is put
D/A converter output voltage is amplified the voltage amplitude value driving needed for Electrowetting device by big device unit；Described line scanner list
Unit's voltage pulse signal required for producing the scanning of Electrowetting device row；Described power subsystem is powered to other unit modules.
Main Control Unit by having singlechip CPU, embedded type CPU or computer CPU of programming Control function etc., I
Select STM32 series monolithic, be used for completing to realize electric moistening display non-linear voltage amplitude gray scale rendition modulation control
The programming Control of Circuits System, completes Data Transmission Controlling and sequencing contro etc..Data Input Interface unit is by having caching work(
The Digital Logical Circuits of energy or latch function are constituted, and we select HC245 eight bit data buffer chip, are used for completing grey
According to input-buffer control, according to the case for this embodiment, the gradation data of input is 4, and input timing is complete by STM32 single-chip microcomputer
Become.Gradation data converter unit is searched the memory device of table function, fpga chip or is possessed the integrated of calculation function by having
Circuit is constituted, and we select Altera FPGA MAX family chip EPM7032SC7, write look-up table using Verilog language
Program, the conversion for realizing original gradation data to D/A converter input data needed for target gray driving voltage controls,
The FPGA look-up table means being constructed in the present embodiment meet 4 bit binary data inputs, right according to table 1 first row and the 4th row
The eight-digit binary number data output answered, such as inputs 4 bits and then exports 8 bits for " 0000 " and be
" 00000000 ", it is " 00100010 " that input 4 bits then export 8 bits for " 0001 ", inputs 4 binary systems
It is " 00101000 " etc. that number then exports 8 bits for " 0010 ", travels through the feelings of all of 16 4 binary systems
Condition.It is 16 GTGs that the present embodiment selects current common electronicses paper display gradation of image, that is, the original gray-scale inputting enters for 4 two
Number processed, it exports the number as gradation data converter unit by HC245 eight bit data buffer chip Data Input Interface unit
According to input, and 8 data then data input as next circuit unit D/A converter unit of data conversion unit output.
Due to this drive circuit system column direction there are 64 roads it is therefore necessary to design one row parallel data displacement latch controllers by
The 64 road column data of a line are respectively allocated to the D/A converter on each road.Row parallel data displacement latch controllers unit is by possessing 8
Parallel-by-bit shifts latch, FPGA module or the integrated circuit composition possessing corresponding function, and we select 7 Altera
FPGA Cyclone family chip EP1C6Q240C8 is used for simultaneously raw column data displacement to latch output to accordingly by certain sequential
On row, write using Verilog language and enable order 8 bit parallel data input, be then passed through displacement cascade and export phase respectively
The 8 nonlinear amplitude data that should arrange input the D/A converter unit of respective column respectively.D/A converter unit is by having digital-to-analogue
The integrated circuit of translation function is constituted, and we select 8 D/A chip DAC0832, is used for realizing 8 bit binary number signals arriving
The conversion of corresponding analog voltage.Linear voltage amplifier unit is by operational amplifier and peripheral circuit or integrated voltage amplifier
Part is constituted, and we select LM324 op-amp, and its output voltage maximum is used for for D/A converter output voltage amplifying drive
Voltage amplitude value needed for dynamic Electrowetting device, adds that peripheral resistor constitutes the proportion operational amplifier with voltage gain,
When D/A converter inputs 8 maximum binary number " 11111111 ", the analogue signal of D/A converter output passes through this ratio
The maximum voltage value that operational amplifier amplifies output is set as "+17.15V ", and the row electrode drive electricity as Electrowetting device
Pressure.An above-described D/A converter and the column voltage process circuit on linear voltage amplifier composition 1 tunnel, electrowetting
Display screen has 64 road row drive electrodes it is therefore desirable to 64 sets of such column voltage process circuits.Line scanner unit is by address
Decoder and pulse amplifier circuit or be made up of row scanning integrated device, required for producing the scanning of Electrowetting device row
Voltage pulse signal, we from Altera FPGA MAX family chip EPM7128SC7 and have negative voltage enlarging function
Pulse integrated amplifier ULN2803 chip is constituted, and the running voltage of this operating die is chosen to be the threshold voltage of Electrowetting device
It is set as -23.35V, the row cutting electrode of 64 row is had it is therefore desirable to compile using Verilog language according to electrowetting display screen
Writing 6-64 decoder module is 6 bit address signal inputs, and this 6 bit address signal is scanned according to view data by STM32 single-chip microcomputer
Sequential produces and is input to the address signal input of EPM7128SC7 chip, the 64 tunnel one line period effective impulse scanning of generation
Pulse exports, and is separately input to carry out voltage amplification in 8 ULN2803 integrated amplifier chips, negative after finally amplifying
The effective scanning impulse of voltage is connected with 64 tunnel electrowetting display screen line electrodes.Power subsystem by multivoltage output switch power source or
Person's linear voltage stabilization potential circuit is constituted, and provides required running voltage for the modules for circuit arrangement, mainly includes number
Voltage needed for voltage needed for word logic circuit voltage, linear voltage amplifier unit, line scanner unit etc..
It should be noted that the electrowetting display screen supposing in the embodiment of the present invention is monochrome display, if will drive
Dynamic electric moistening display be colorful display screen when, above-described circuit implementation process still can adopt, only for
In addition it is also necessary to make other two sets of identical column electrode drive circuits again for colour circuit, its core content with we above institute
The monochromatic drive circuit system stated is completely the same, simply now has the colored binary system gradation data in 3 tunnels respectively as 3 roadbed colors
The input of column data, 64 road row driving pulse outputs of each primary colours are respectively connected to the electrowetting display screen of corresponding color, so
The display of colored precisely non-linear voltage magnitude image just can be realized.
It should be noted that the resolution of electrowetting display screen that the embodiment of the present invention is supposed is 64 × 64 dot matrix, this
Inventive method is also fully applicable for the various resolution display screens low or higher than it than it in fact, now required Drive of row and column
Way is done and is increased and decreased accordingly.If after certainly reaching certain resolution, it is higher that required main controller CPU is accomplished by selection
The processor of performance, could smoothly process and control this Circuits System, but whether adopting which kind of chip, the core of the present invention
Idea will not change.
It should be noted that the electrowetting display screen that the embodiment of the present invention is supposed is passive drive display screen, in fact originally
The Method and circuits device of invention is also applied for the electrowetting display screen of active matrix driving, and the method for the present invention and circuit arrangement are complete
Monochromatic and color active electrowetting display screen can directly be applied to, same Expected Results will be obtained.
The above each several part circuit module being uniformly coordinated under control in monolithic chip, produces and realizes a width width electrowetting
Display also original image shows required row-column electrode drive voltage signal, finally just 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 moistening, in the present invention, electric moistening display gray scale modulation method is same
Sample is also applied for electric wet-type display.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all spirit in the present invention and
Within principle, any modification, equivalent substitution and improvement made etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of electric moistening display non-linear voltage amplitude gray scale rendition modulator approach is it is characterised in that include：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 alternative approach of nonlinear gray modulation, controls and produces the voltage of nonlinear amplitude change not waiting increment and a line
The voltage collective effect of scanner unit output, on two drive electrodes of electric moistening display pixel cell, makes electrowetting device
The non-polar fluid of part pixel cell produces and shrinks, and realizes input gray level data output accurate target gray hierarchical modulation.
2. electric moistening display non-linear voltage amplitude gray scale rendition modulator approach according to claim 1, its feature exists
In：The voltage value of the described nonlinear amplitude change not waiting increment is by the difference of Electrowetting device threshold voltage to saturation voltage
Together decide on the quantity of realized tonal gradation.
3. electric moistening display non-linear voltage amplitude gray scale rendition modulator approach according to claim 1, its feature exists
In：The non-linear voltage amplitude gray modulation data that the conversion of original gray-scale data obtains comprises the following steps：
Step S1：By experiment or existing experimental data obtain Electrowetting device relative luminance to be driven or aperture opening ratio with
Driving voltage L-V relation curve, determines the required GTG driving electrowetting gray scale to show sum G simultaneouslyALL, from the L-V being obtained
Calculate in relation curve from threshold voltage VTHTo the corresponding required maximum drive voltage V of maximum relative luminance aperture opening ratioMAXVoltage
Difference VD=VMAX-VTH, and calculate the corresponding relative luminance of threshold voltage or aperture opening ratio L 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/GALLG is realized in calculatingALLThe relative luminance of GTG or increment Delta L of aperture opening ratio, according to increasing
Amount Δ L divides the corresponding GTG of brightness, and according to relative luminance or aperture opening ratio and driving voltage relation curve, after being divided
Driving voltage V corresponding to GTG1~VGALL；
Step S3：According to digit B of D/A converter input data, calculate output analog voltage to quantify total exponent number is 2B, in conjunction with
Voltage difference V obtained by step S1D, the smallest incremental magnitude of voltage Δ V=V that electrowetting modulates driving voltage can be calculatedD/
（2B-1）；
Step S4：The voltage V that step S2 is obtained1~VGALLIt is divided by with Δ V respectively, and rounds fractional part, this numerical value is exactly every
The number of the non-linear voltage amplitude gray modulation that individual input original gray-scale data obtains after the process of gradation data converter unit
According to；
Step S5：With the gradation data after the conversion of step S4 output through D/A converter unit and linear voltage amplifier list
The process of unit obtains general luma data corresponding electric moistening display accurately target gray scale.
4. electric moistening display non-linear voltage amplitude gray scale rendition modulator approach according to claim 1, its feature exists
In：Described institute rises non-polar fluid with driving voltage relation curve for voltage according to Electrowetting device relative luminance or aperture opening ratio
Contraction phase or voltage decline the nonfluid expansionary phase.
5. a kind of electric moistening display non-linear voltage amplitude gray scale rendition modulate its device it is characterised in that：Including main control
Device unit, Data Input Interface unit, gradation data converter unit, row parallel data displacement latch controllers unit, D/A conversion
Device unit, linear voltage amplifier unit, line scanner unit and power subsystem；Described Main Control Unit is used for completing to realize
The programming Control of electric moistening display non-linear voltage amplitude gray scale rendition modulation control circuit system；Described Data Input Interface
Unit is used for completing gradation data input control；Described gradation data converter unit is used for realizing original gradation data to target ash
Needed for degree driving voltage, the conversion of D/A converter unit input data controls；Described row parallel data shifts latch controllers list
Unit will be for simultaneously raw column data displacement latching output to corresponding row by certain sequential；Described D/A converter unit is used for real
Existing binary digital signal is to the conversion of corresponding analog voltage；D/A converter is exported electricity by described linear voltage amplifier unit
Press the big voltage amplitude value driving needed for Electrowetting device；Described line scanner unit is used for producing the scanning of Electrowetting device row
Required voltage pulse signal；Described power subsystem is powered to other unit modules.
6. electric moistening display non-linear voltage amplitude gray scale rendition modulating device according to claim 5, its feature exists
In：The quantity that described gradation data converter unit realizes tonal gradation is 2 secondary number formulary.
7. electric moistening display non-linear voltage amplitude gray scale rendition modulating device according to claim 5, its feature exists
In：Gradation data converter unit in described device is searched the memory device of table function, FPGA module or is possessed fortune by having
The integrated circuit calculating function is constituted；
The difference that described gradation data converter unit inputs the data of neighboring gradation grade two-by-two is at equal intervals, through described gray scale
After data conversion unit conversion there are following characteristics in the data of the adjacent gray levels two-by-two of output：One be not necessarily etc. between
Every；Two is the difference that its value is more than or equal to corresponding former input gray level level spacing；Three is that all level spacing differences assume non-thread
Property variation relation, and consistent with the non-linear relation of driving voltage with electric moistening display relative luminance.
8. electric moistening display non-linear voltage amplitude gray scale rendition modulating device according to claim 5, its feature exists
In：In described device row parallel data displacement latch controllers unit by possess 8 parallel-by-bits displacement latch, FPGA module or
The integrated circuit that person possesses corresponding function is constituted, for simultaneously raw column data shifting latch output to row accordingly by certain sequential
On.
9. electric moistening display non-linear voltage amplitude gray scale rendition modulating device according to claim 5, its feature exists
In：Line scanner unit in described device scans integrated device structure by address decoder and pulse amplifier circuit or by row
Become.
10. electric moistening display non-linear voltage amplitude gray scale rendition modulating device according to claim 5, its feature exists
In：Described power subsystem is made up of multivoltage output switch power source or linear voltage stabilization potential circuit.
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