CN114898716B - Method for high gray scale electrowetting display device based on cooperation of voltage modulation and time modulation - Google Patents
Method for high gray scale electrowetting display device based on cooperation of voltage modulation and time modulation Download PDFInfo
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- CN114898716B CN114898716B CN202210512040.9A CN202210512040A CN114898716B CN 114898716 B CN114898716 B CN 114898716B CN 202210512040 A CN202210512040 A CN 202210512040A CN 114898716 B CN114898716 B CN 114898716B
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- 238000013139 quantization Methods 0.000 claims description 2
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- 230000007547 defect Effects 0.000 abstract description 3
- 229910002059 quaternary alloy Inorganic materials 0.000 abstract description 3
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- 238000010586 diagram Methods 0.000 description 11
- 238000004590 computer program Methods 0.000 description 7
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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 application provides a method for a high gray scale electrowetting display device based on the cooperation of voltage modulation and time modulation, which comprises the steps of firstly quantizing input image data into n-bit quaternary system, dividing a row display period T into n subcycles, weighting each subcycle at the same time, endowing a display unit with four different voltage amplitudes in the same subcycle, wherein the voltage amplitudes of each subcycle are different and form a certain multiple relation, and sequentially displaying each subcycle bit by bit in the display time of the row display period T to form 4 n Is a luminance gray scale of (c). The application can make up for the reduced display quality of the electrowetting electronic paper due to the fact that the display device cannot respond to the too narrow pulse by adopting the PWM through the advantage of low response speed requirements of the amplitude modulation on the driving circuit and the display device, and can make up for the defect of complex amplitude modulation circuit of the electrowetting electronic paper due to the advantage of easy realization of the PWM driving circuit, thereby realizing the higher gray scale display effect of the electrowetting electronic paper.
Description
Technical Field
The application belongs to the technical field of electrowetting display devices, and particularly relates to a method for a high-gray-scale electrowetting display device based on cooperation of voltage modulation and time modulation.
Background
The principle of the electrowetting display is that the wettability of the ink on the substrate is changed by changing the voltage between the ink and the insulating substrate, the contact angle is changed, the ink is deformed and displaced, and compared with displays such as LCD, LED and the like, the electrowetting display successfully manufactured by using the principle has the advantages of quick response speed, no backlight source, low power consumption, high brightness, capability of being watched under strong light, no viewing angle limitation and the like, so that the electrowetting display has wide application prospect.
As a new type display, electrowetting displays are widely paid attention to by students at home and abroad, however, most researches mainly aim at the aspects of electrowetting device structures, ink materials, driving systems and the like, and the researches on gray scale display technology are important contents of electrowetting display technology researches. Since the initial electrowetting display device is mainly applied to text image display, the requirement on gray level is low, and thus the gray level driven by the driving chip designed by each large company is relatively low. However, electrowetting electronic paper display is now moving towards "high color image quality", "video playing" and "low power consumption", and low gray scales no longer meet the display quality requirements. Most driving waveform driving methods are designed at present, the highest gray level which can be realized is 64, and no method for realizing higher gray level exists. Therefore, in order to enrich the dynamic video display and further optimize the display quality of the electrowetting electronic paper, a new method needs to be invented for high-gray-scale display of the electrowetting electronic paper display.
Disclosure of Invention
Aiming at the defects and shortcomings of the prior art, the application aims to provide a method for a high-gray-scale electrowetting display device based on the cooperation of voltage modulation and time modulation, and the display effect of higher gray scales of electrowetting electronic paper can be realized by using the existing chip. It firstly quantizes the input image data into n-bit quaternary system and divides the line display period T into n sub-periods, and at the same timeWeighting each subcycle, giving four different voltage amplitudes to the display unit in the same subcycle, wherein the voltage amplitudes of each subcycle are different and form a certain multiple relation, and sequentially displaying each subcycle bit by bit in the display time of the row display period T to form 4 n Is a luminance gray scale of (c). The application can make up for the reduced display quality of the electrowetting electronic paper due to the fact that the display device cannot respond to the too narrow pulse by adopting the PWM through the advantage of low response speed requirements of the amplitude modulation on the driving circuit and the display device, and can make up for the defect of complex amplitude modulation circuit of the electrowetting electronic paper due to the advantage of easy realization of the PWM driving circuit, thereby realizing the higher gray scale display effect of the electrowetting electronic paper.
The application adopts the following technical scheme:
a method of a high gray scale electrowetting display device based on voltage modulation and time modulation, characterized by: quantizing input image data, dividing a line display period T into n subcycles, weighting each subcycle at the same time, giving four different voltage amplitudes to a display unit in the same subcycle, wherein each subcycle has different voltage amplitudes and is in a certain multiple relation, and sequentially displaying each subcycle bit by bit in the display time of the line display period T to form 4 n Is a luminance gray scale of (c).
Further, the quantization of the input image data is specifically: the input binary gray data is quantized into n-bit quaternary data of equal value.
Further, the weights adopted for weighting each sub-period are as follows: t (T) 1 :T 2 :T 3 :…:T n-1 :T n =1:1:1:…:1:2。
Further, the four different voltage magnitudes given to the display unit are specifically: each sub-period has four magnitudes, wherein the first magnitude is a reference voltage, determined by the device operating voltage.
Further, the area of the product of the voltage amplitude and time in each sub-period is four times the corresponding area of the previous sub-period.
Further, the step by stepThe bit display is specifically: according to the electrowetting progressive driving mode, one sub-period carries out one-time line scanning, a corresponding amplitude voltage is applied in the first sub-period, first bit data is displayed, and the like, after n times of line scanning, n bits of gray data are displayed bit by bit, a second line is scanned, and after the complete image is scanned, 4 is displayed n Gray scale images.
Compared with the prior art, the application and the preferred scheme thereof can expand the gray scale display effect, for example, when the existing chip can only realize 64 gray scales at maximum, the application can realize 256 and higher gray scale display effects.
Drawings
The application is described in further detail below with reference to the attached drawings and detailed description:
FIG. 1 is a driving waveform diagram of an embodiment of the present application;
FIG. 2 is a partial gray scale driving waveform diagram according to an embodiment of the present application;
FIG. 3 is a schematic diagram of gray scale levels 1 that can be implemented according to an embodiment of the present application;
fig. 4 is a schematic diagram of gray scale levels that can be achieved according to an embodiment of the present application.
Detailed Description
The technical solutions of the present application will be clearly and completely described by means of examples, and it is obvious that the described examples are only some examples of the present application and not all examples. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
As shown in FIG. 1, this embodiment provides a method for a high gray scale electrowetting display device based on the cooperation of voltage amplitude modulation and time modulation, which firstly quantizes input image data into n-bit quaternary system, divides a line display period T into n sub-periods, simultaneously weights each sub-period, gives four different voltage amplitudes to a display unit in the same sub-period, and sequentially displays each sub-period bit by bit in the display time of the line display period T in a certain multiple relationship to form 4 n Is a luminance gray scale of (c).
Preferably, the divided sub-periods are weighted by T 1 :T 2 :T 3 :…:T n-1 :T n =1:1:1:…:1:2。
Preferably, in the present embodiment, the magnitudes of the respective display units are set as follows: each sub-period has four amplitudes, the first amplitude is 0V, and the three remaining amplitudes are shown in the table below (256 gray levels are taken as an example):
preferably, in this embodiment, the area of the product of the voltage amplitude and time in each sub-period is four times the previous area, as shown in the following table (256 gray scales are taken as an example):
fig. 2 shows a schematic diagram of driving waveforms of a part of gray scales (e.g., gray scales 30, 40, 91, 162, etc.).
In this embodiment, the bitwise display is the rootAccording to the electrowetting progressive driving mode, one sub-period carries out one-time line scanning, a corresponding amplitude voltage is applied in the first sub-period, first bit data is displayed, and the like, after n times of scanning on one line, n bits of gray data are displayed bit by bit, the second line is scanned, and after the complete image is scanned, 4 can be displayed n Gray scale images. In this embodiment, as shown in fig. 3 and 4, it is assumed that eight-bit binary data is input, one display period is divided into four sub-periods, and after superposition of each sub-period, the area of the display period is in a proportional relationship with gray scale, and after exhaustive verification, the verified gray scale can reach 256 kinds.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present application, and is not intended to limit the application in any way, and any person skilled in the art may make modifications or alterations to the disclosed technical content to the equivalent embodiments. However, any simple modification, equivalent variation and variation of the above embodiments according to the technical substance of the present application still fall within the protection scope of the technical solution of the present application.
The present application is not limited to the above-mentioned preferred embodiments, and any person can obtain other methods of high gray scale electrowetting display devices based on the cooperation of voltage modulation and time modulation in various forms under the teaching of the present application, and all equivalent changes and modifications made by the claims of the present application shall be covered by the present application.
Claims (2)
1. A method of a high gray scale electrowetting display device based on voltage modulation and time modulation, characterized by: quantizing input image data, dividing a line display period T into n subcycles, weighting each subcycle at the same time, giving four different voltage amplitudes to a display unit in the same subcycle, wherein each subcycle has different voltage amplitudes and is in a certain multiple relation, and sequentially displaying each subcycle bit by bit in the display time of the line display period T to form 4 n Is a luminance gray scale of (2);
the quantization of the input image data is specifically: quantizing the input binary gray data into n-bit quaternary data with equal value;
the weights adopted for weighting each subcycle are as follows: t (T) 1 :T 2 :T 3 :…:T n-1 :T n =1:1:1:…:1:2；
The four different voltage amplitudes given to the display unit are specifically: each sub-period has four amplitude values, wherein the first amplitude value is a reference voltage and is determined by the working voltage of the device;
the area of the product of the voltage amplitude and time in each sub-period is four times the corresponding area of the previous sub-period.
2. The method of a high gray scale electrowetting display device based on voltage modulation in combination with time modulation of claim 1, wherein: the bitwise display specifically comprises: according to the electrowetting progressive driving mode, one sub-period carries out one-time line scanning, a corresponding amplitude voltage is applied in the first sub-period, first bit data is displayed, and the like, after n times of line scanning, n bits of gray data are displayed bit by bit, a second line is scanned, and after the complete image is scanned, 4 is displayed n Gray scale images.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210512040.9A CN114898716B (en) | 2022-05-12 | 2022-05-12 | Method for high gray scale electrowetting display device based on cooperation of voltage modulation and time modulation |
| PCT/CN2022/097508 WO2023216350A1 (en) | 2022-05-12 | 2022-06-08 | Method for high gray level electrowetting display device based on cooperation of voltage modulation and time modulation |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210512040.9A CN114898716B (en) | 2022-05-12 | 2022-05-12 | Method for high gray scale electrowetting display device based on cooperation of voltage modulation and time modulation |
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| CN114898716A CN114898716A (en) | 2022-08-12 |
| CN114898716B true CN114898716B (en) | 2023-10-27 |
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| WO (1) | WO2023216350A1 (en) |
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| CN101281716A (en) * | 2007-04-03 | 2008-10-08 | 株式会社日立显示器 | Display device |
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| Publication number | Publication date |
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| CN114898716A (en) | 2022-08-12 |
| WO2023216350A1 (en) | 2023-11-16 |
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