CN107945749A - A kind of driving method for adjusting the more gray scales of electric moistening display and showing - Google Patents
A kind of driving method for adjusting the more gray scales of electric moistening display and showing Download PDFInfo
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- CN107945749A CN107945749A CN201711343913.3A CN201711343913A CN107945749A CN 107945749 A CN107945749 A CN 107945749A CN 201711343913 A CN201711343913 A CN 201711343913A CN 107945749 A CN107945749 A CN 107945749A
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- driving
- electric moistening
- moistening display
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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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
Abstract
The invention discloses a kind of driving method for adjusting the more gray scales of electric moistening display and showing, the driving voltage waveform of electric moistening display includes several period of sub-frame, wherein last period of sub-frame corresponds to reset pulse, remaining period of sub-frame corresponds to driving pulse, in the case where driving time is constant, the subframe pulsewidth of the driving pulse is set not wait and arbitrary arrangement.The present invention can improve display gray scale so that displayed image details is finer and smoother using the driving pulse subframe random combine that pulsewidth does not wait in the case where not influencing the refresh cycle, reset pulse selects pulsewidth length different according to the difference of current pixel point gray value, is conducive to suppress the charge leakage of electrowetting.
Description
Technical field
The present invention relates to display technology field, more particularly to a kind of driving for adjusting the more gray scales of electric moistening display and showing
Method.
Background technology
In recent years, the advantages that electronic paper display device is similar to paper because of its perception effect, low-power consumption, fast response speed and
Receive much concern.Electrowetting Electronic Paper can equally realize high brightness, high contrast, low energy consumption compared to electrophoretic electronic paper, and in sound
Answer and be faster than electrophoretic electronic paper in speed, thus as the focus on research direction of electric paper display of new generation.
Electrowetting Electronic Paper is to be changed based on two kinds of fluid contact angles and realize display switch, and once complete frame is shown
Pixel status includes opening and closing two states.The open mode is：It is electric when starting application pixel voltage and reaching threshold value
With the increase of voltage after pressure, significant change takes place until reaching saturation state, it is observed that bright in electrowetting contact angle
Aobvious optical change；The closed mode is：When the pixel voltage of application reduces
The contact angle of electrowetting can try one's best therewith recovers original state, but since the electronics in electric moistening display fluid is shown
Substrate is captured, and electrowetting contact angle can not be completely recovered to original state during voltage reduces so that display
Optical states that is, display contrast or gray scale reduce.The driving ripple of electrowetting Electronic Paper is being designed based on the above problem
During shape, drive waveforms are made of two parts, are driving pulse, reset pulse respectively.Driving pulse is used for showing picture material；It is multiple
Digit pulse is used for resetting contact angle and discharges by the electric charge of substrate capture.
Due under different grey states, the degree of substrate capture electric charge is different and electrowetting contact angle reset needed for
Time is different, so needing a reset pulse, which can be such that contact angle recovers completely during voltage reduces
To original state, therefore the electrical potential difference of reset pulse and public electrode need to be always 0, and the duration of reset pulse will be with
The difference of gray scale and change.
The content of the invention
In view of the above shortcomings of the prior art, the present invention proposes a kind of driving for adjusting the more gray scales of electric moistening display and showing
Method, improves picture quality and renewal time.
To achieve the above object, the technical scheme is that：A kind of drive for adjusting the more gray scales of electric moistening display and showing
Dynamic method, the driving voltage waveform of electric moistening display include several period of sub-frame, and wherein last period of sub-frame corresponds to
Reset pulse, remaining period of sub-frame corresponds to driving pulse, in the case where driving time is constant, sets the son of the driving pulse
Frame pulsewidth does not wait and arbitrary arrangement.
Further, the pulsewidth of the reset pulse changes according to the difference of grey scale pixel value, and grey scale pixel value is bigger
Pulsewidth is bigger.
Further, first sub-frame duration of the driving pulse is more than or equal to tmin, tminSpecific calculating side
Method is：
（1）Electric moistening display is measured to obtain the curve with voltage increase reflectivity changesV R -R E1 , obtain electrowetting and show
Show the threshold voltage V of devicethWith saturation voltage Vmax；
（2）According to the threshold voltage V of electric moistening displayth, determine to be applied to subframe minimum length in time on electric moistening display
tmin。
Further, each sub-frame duration of the driving pulse is less than tmax, according to the saturation of electric moistening display
Voltage Vmax, determine to be applied to subframe maximum length in time t on electric moistening displaymax。
Further, the voltage of electric moistening display pixel common electrode is fixed as+15V, and the driving pulse includes three
The different voltage of kind：- 15v or 0v or 15v.
Further, the voltage of the reset pulse is+15V.
Compared with prior art, the present invention has beneficial effect：In the constant feelings for not influencing refresh rate of total driving time
The gray scale of electrowetting Electronic Paper is improved under condition by way of the pulsewidth subframes combine such as not, so that the display of electrowetting Electronic Paper
The more abundant exquisiteness of picture.Determined at the same time on the basis of single constant reset subframe using the difference of pixel grey scale multiple
The pulsewidth size of seat frame, so as to preferably suppress the charge leakage of electrowetting Electronic Paper.
Brief description of the drawings
Fig. 1 is typical electrowetting display picture element structure and displaying principle schematic diagram；
Top view when Fig. 2 is typical electric moistening display ink tiling；
Fig. 3 is top view when typical electric moistening display ink shrinks paving；
Fig. 4 is the curve synoptic diagram that electric moistening display increases reflectivity changes with voltage in the embodiment of the present inventionV R -R E1 ；
Fig. 5 is electric moistening display drive waveforms comparison diagram in the embodiment of the present invention.
Embodiment
The present invention will be further described with reference to the accompanying drawings and embodiments.
Fig. 1 is typical electrowetting display picture element structure and displaying principle schematic diagram, which includes white substrate, transparent
Electrode, hydrophobic coating, ink, pixel wall.When it is no application driving voltage on the pixel electrode when, as shown in left side, ink will
It is laid on hydrophobic layer, light reaches ink by water layer, and the color of ink is shown after reflection, and pixel definition is closing shape at this time
State.When applying driving voltage to pixel electrode, as shown on the right, ink is no longer paved with whole pixel compartments, but at interface
Be pushed through under the action of power on one side, reflection substrate be exposed to natural light under so as to reflective white substrate color, at this time as
Element definition is in an open state.Top view when Fig. 2 is ink tiling；If Fig. 3 is top view when ink is shunk.What ink was shunk
The size of degree and reflected light determines by driving voltage size, and when driving voltage is less than threshold voltage, ink shrinkage degree is very
It is small, on the contrary when driving voltage is higher than threshold voltage, ink shrinkage degree is bigger.
Electric moistening display shown in Fig. 4 with voltage increase when, the reflectivity of electric moistening display, that is, aperture opening ratio becomes
Change curve, for controlling voltage swing when gray scale is shown needed for electric moistening display.
The present invention provides a kind of driving method for adjusting the more gray scales of the more gray-scale monitors of electrowetting and showing, for adjusting electric profit
The gray level and grey scale accuracy of wet display.
In the present embodiment, electrowetting electric paper display is measured to obtain with voltage increase reflectivity changes
CurveV R -R E1 , as shown in Figure 4, you can obtain the threshold voltage V of electrowettingthWith saturation voltage Vmax。
According to the threshold voltage V of obtained electric moistening displaythDetermine that first sub-frame duration of driving pulse is big
In equal to tmin, according to the saturation voltage V of obtained electric moistening displaymaxDetermine that each sub-frame duration of driving pulse is small
In tmax。
In the present embodiment, shown using electrophoresis showed source driving chip and electrophoresis showed grid drive chip for electrowetting
Show that device provides drive waveforms and scanning signal；The voltage of the electric moistening display pixel common electrode is fixed as+15V；Driving
Multiple driving pulses are included in waveform；The driving voltage of driving pulse includes three kinds：- 15v or 0v or 15v.
It is the present embodiment electric moistening display drive waveforms comparison diagram shown in Fig. 5, wherein upside is common asymmetric dynamic
State drive waveforms figure, downside are the pulsewidth subframes combine driving voltage waveforms such as not after present invention adjustment, driving voltage waveform bag
Containing 5 period of sub-frame, wherein 4 four cycles of 1 ~ subframe of subframe directly drive the picture frame of pixel so that current pixel point is shown
Show corresponding grayscale.Reset pulse keeps pulsewidth length constant.Downside is the adjustment for upside normal drive waveform, in driving week
In the case that phase is constant, the driving pulse of 1 ~ subframe of atom frame 4 is subjected to random combine using the subframe that pulsewidth does not wait, in this reality
Apply in example, if Fig. 3 is that 1 is used at latter two subframe：The subframe of 2 length is combined, the subframe arteries and veins such as or not driving pulse
Width is less than tmaxAnd the pulsewidth of first subframe is more than or equal to tmin, so that in original corresponding pixel points gray scale and refresh rate not
Waveform after being adjusted in the case of change makes the grayscale higher of image, and image detail part is shown finer and smoother abundant.The present invention
Improved reset pulse pulsewidth is changed according to the difference of pixel grey scale, so can preferably suppress charge leakage.
It should be noted that mode and the duration of pulsewidth that the subframe that pulsewidth does not wait in driving pulse combines are any
, except the combination of such as Fig. 3 in the present invention, other combinations are also applied for the driving that the adjustment more gray scales of electrowetting are shown
Method.
The foregoing is merely presently preferred embodiments of the present invention, all equivalent changes done according to scope of the present invention patent with
Modification, should all belong to the covering scope of the present invention.
Claims (6)
- A kind of 1. driving method for adjusting the more gray scales of electric moistening display and showing, it is characterised in that the driving of electric moistening display Voltage waveform includes several period of sub-frame, and wherein last period of sub-frame corresponds to reset pulse, remaining period of sub-frame corresponds to Driving pulse, in the case where driving time is constant, sets the subframe pulsewidth of the driving pulse not wait and arbitrary arrangement.
- 2. driving method according to claim 1, it is characterised in that the pulsewidth of the reset pulse is according to grey scale pixel value Difference and change, grey scale pixel value is bigger, and pulsewidth is bigger.
- 3. driving method according to claim 1, it is characterised in that first sub-frame duration of the driving pulse More than or equal to tmin, tminCircular be：（1）Electric moistening display is measured to obtain the curve with voltage increase reflectivity changesV R -R E1 , obtain electrowetting and show Show the threshold voltage V of devicethWith saturation voltage Vmax；（2）According to the threshold voltage V of electric moistening displayth, determine to be applied to subframe minimum length in time on electric moistening display tmin。
- 4. driving method according to claim 3, it is characterised in that each sub-frame duration of the driving pulse is small In tmax, according to the saturation voltage V of electric moistening displaymax, determine to be applied to subframe maximum length in time on electric moistening display tmax。
- 5. driving method according to claim 1, it is characterised in that the voltage of electric moistening display pixel common electrode is consolidated It is set to+15V, the driving pulse includes three kinds of different voltages：- 15v or 0v or 15v.
- 6. driving method according to claim 5, it is characterised in that the voltage of the reset pulse is+15V.
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| CN201711343913.3A CN107945749B (en) | 2017-12-15 | 2017-12-15 | Driving method for adjusting multi-gray-scale display of electrowetting display |
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| CN201711343913.3A CN107945749B (en) | 2017-12-15 | 2017-12-15 | Driving method for adjusting multi-gray-scale display of electrowetting display |
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| CN107945749B CN107945749B (en) | 2020-03-10 |
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Cited By (2)
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| CN108648701A (en) * | 2018-05-25 | 2018-10-12 | 福州大学 | A kind of method and device reducing the reflux of electrowetting Electronic Paper ink |
| CN108766370A (en) * | 2018-06-11 | 2018-11-06 | 深圳市国华光电科技有限公司 | A kind of electrowetting drive system and its control method |
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| CN106169287A (en) * | 2016-08-03 | 2016-11-30 | 深圳市国华光电科技有限公司 | A kind of many gray-scale adjustment methods of electrowetting and circuit |
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| EP0899710A2 (en) * | 1997-08-29 | 1999-03-03 | Texas Instruments Incorporated | Method of increasing the brightness of a display system |
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| CN107945749B (en) | 2020-03-10 |
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