CN108037625B - Color electronic paper display device with three-layer superposition structure - Google Patents
Color electronic paper display device with three-layer superposition structure Download PDFInfo
- Publication number
- CN108037625B CN108037625B CN201810095567.XA CN201810095567A CN108037625B CN 108037625 B CN108037625 B CN 108037625B CN 201810095567 A CN201810095567 A CN 201810095567A CN 108037625 B CN108037625 B CN 108037625B
- Authority
- CN
- China
- Prior art keywords
- liquid crystal
- cholesteric liquid
- layer
- crystal cell
- sub
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/165—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field
- G02F1/166—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect
- G02F1/167—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect by electrophoresis
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
Abstract
The invention discloses a color electronic paper display device with a three-layer superposition structure, which comprises a plurality of pixels with three-layer display units; the three-layer display unit of the pixel is sequentially provided with a first cholesteric liquid crystal box, a second cholesteric liquid crystal box and an electrophoresis layer from the observation side; the ratio of the sub-pixel area of the smaller area to the sub-pixel area of the larger area in the sub-pixels of each layer of display units of the pixel is 1: n, the number ratio is N:1, and the outline of the N sub-pixels with smaller areas arranged together is the same as or similar to the outline of the sub-pixels with larger areas, wherein N is a positive integer. The invention has the advantages of large mixed color overlapping area, flexible segmentation of each pixel, and simple production process, and widens the displayed gray level; the method has the advantages of wide working temperature, wide color reproduction range and high refresh rate; has the advantages of high contrast ratio between black and white and wide color reproduction range; the color reproduction range is wide and high, and the mass production is easy.
Description
Technical Field
The invention belongs to the technical field of electronic paper, and particularly relates to a color electronic paper display device with a three-layer superposition structure.
Background
The cholesteric liquid crystal color electronic paper is a display mode for realizing full color image presentation by adopting single-layer or three-layer superposition and PM (passive matrix) driving, and the technical proposal is that the wavelength of reflected light is determined by adjusting the pitch and the double refractive index of cholesteric liquid crystal molecules through unique Bragg reflection of a cholesteric liquid crystal material. The cholesteric liquid crystal layer can be manufactured by selecting proper cholesteric liquid crystal mixture to reflect light with three wavelengths of red, green and blue, and the three light are arranged in a specific space through three primary colors of additive color mixing, so that full-color display is realized. The basic structure of the pixel of the cholesteric liquid crystal type color electronic paper is a multi-layer structure, and each layer can reflect one color of blue, green and red respectively. The cholesteric liquid crystal color electronic paper with three sub-pixel structures arranged along the surface separates three cholesteric liquid crystal materials capable of reflecting blue, green and red light without overlapping each other in the same layer to realize color overlapping. The bottom layer is a black ink light absorbing layer, the reflectivity of each reflecting layer (or unit) to 3 kinds of primary color light in the ambient light is correspondingly changed, and the reflected 3 kinds of primary color light with proper intensity can be mixed into a required certain color according to the color mixing principle, so that color display is realized. Its advantages are high brightness and low display effect, especially the dark white state and low purity of red light.
Besides cholesteric liquid crystal color electronic paper, there are many technical schemes of color electronic paper, and the color modes with influence are filter type, color particle type, electrowetting type and other non-filter schemes, which are all driven by an addressing mode of an AM (Active Matrix). In the conventional display mode, particle scattering, liquid or solid surface reflection, and selective reflection or scattering by birefringence are used. Color electronic paper using a filter method is technically easy to realize, but a color filter can reduce light reflectivity or display brightness, and meanwhile, a plurality of color sub-pixels are combined into one display pixel without overlapping, so that the number of pixels in a unit area is reduced. The technology that does not require a color filter is subdivided into transverse electrophoresis technology, inverse emulsion electrophoresis technology, electrowetting technology, interferometric modulation technology, photonic crystal display, electrochromic display technology, and the like. Up to now, no desired color display state can be obtained at the same time in any display mode, and the main limitations are color brightness and color reproduction range and cost.
In the research and development directions of many manufacturers, the color electronic paper with better comprehensive performance has three layers of cholesteric liquid crystal, electrophoretic type formed by multicolor particles and three-dimensional color mixing type. Unfortunately, the above solutions have not been successful in the mature market. In the color electronic paper, the display effect depends on the condition of the reflection intensity of the five states of black, white and three primary colors. Mainly, the three layers of cholesteric liquid crystal have high cost and poor white performance in any display mode; the electrophoretic blue-green color formed by multicolor particles has poor reproduction, long refreshing time, poor driving stability and poor repeatability, particularly in a single pixel, the types of the multicolor particles are increased, and the waveform change is sensitive under the action of an electric field; the manufacturing process of the two-component liquid crystal box of the three-dimensional color-mixing type color electronic paper is difficult, and the practical application cost is high and still high. In order to obtain wider application, it is necessary to invent a new color electronic paper mode to comprehensively solve the problems of color gamut, gray scale and cost.
Disclosure of Invention
According to the technical problem, a color electronic paper display device with a three-layer stacked structure is provided, wherein both cholesteric liquid crystal boxes use a PM addressing mode to improve transmittance and color reflectivity, have the same or partially same scanning electrode, realize low-cost driving, high reflectivity and wide-color-gamut display performance, and compared with the prior art, the color electronic paper can realize wide color spectrum range, has relatively simple cholesteric liquid crystal box process, and has the advantage of low driving cost in the technical scheme of a multi-layer structure. The invention adopts the following technical means:
a color electronic paper display device with a three-layer superposition structure comprises a plurality of pixels with three-layer display units;
the three-layer display unit of the pixel comprises a first cholesteric liquid crystal box, a second cholesteric liquid crystal box and an electrophoresis layer from the observation side;
the ratio of the sub-pixel area of the smaller area to the sub-pixel area of the larger area in the sub-pixels of each layer of display units of the pixel is 1: n, the number ratio is N:1, wherein the outline of N sub-pixels with smaller areas are arranged together and the outline of the sub-pixels with larger areas are the same or similar, and N is a positive integer; when the outline is similar, the error of each edge of the corresponding three sub-pixels from the overlapping center of the three sub-pixels is less than 10%.
Assuming that the sub-pixel of the minimum area (Pmin) is the sub-pixel of the electrophoretic layer, the sub-pixel of the maximum area (Pmax) is the sub-pixel of the first cholesteric liquid crystal cell, and the area (P) of the second cholesteric liquid crystal cell pixel is greater than or equal to the sub-pixel of the electrophoretic layer and less than or equal to the sub-pixel of the first cholesteric liquid crystal cell, then the following relationship Pmin exists: p=1: n1, P: pmax=1: n2, pmin: pmax=1: and N3. Here, N1, N2, and N3 are positive integers, and when n1=n2=n3=1, the areas of the three sub-pixels are equal. When N1, N2, n3+.1, the contour of the sub-pixel should satisfy: at least one arrangement is such that the profile of the N1 smallest sub-pixels arranged together is the same or similar to the profile of the second cholesteric liquid crystal cell pixel; at least one arrangement is such that the profile of the N2 second cholesteric liquid crystal cell pixels arranged together is the same or similar to the profile of the largest cell pixel; at least one arrangement is such that the outline of the N3 minimum sub-pixels arranged together is the same or similar to the outline of the maximum sub-pixel; when the pixels are not identical, the error between the edges of the corresponding three sub-pixels and the overlapping center of the three sub-pixels is less than 10%.
The electrophoresis layer comprises two or more than two kinds of electrophoresis particles, and the electrophoresis layer is provided with an independent AM driving structure for realizing the change of the graph;
the sub-pixels in the electrophoresis layer corresponding to the first cholesteric liquid crystal box and the second cholesteric liquid crystal box are refreshed simultaneously under the action of independent driving waveforms, but the refresh signal of each sub-pixel does not need to be performed synchronously. The display units with slow refresh rates are refreshed in advance or simultaneously with respect to the display units with fast refresh rates, and the time of the advanced refresh is to ensure that the display units with fast refresh rates finish the refresh at the end of the refresh of the display units with slow refresh rates. In electronic paper display with a multilayer structure, the AM addressing mode has the advantages of high refresh rate, limitation of aperture ratio and high influence on reflectivity and cost; the PM display has the advantages of high transmittance and low cost, and the disadvantage of a relatively low refresh rate. Thus, the first cholesteric liquid crystal cell and the second cholesteric liquid crystal cell are applied with a drive waveform of the PM addressing mode, and the electrophoretic layer has a separate drive structure of the AM addressing mode. The drive waveforms of the PM addressing mode are applied to the scan electrodes of the first and second cholesteric liquid crystal cells by common or partially common row scan signals and respective data signals. The first cholesteric liquid crystal box and the second cholesteric liquid crystal box are used for sealing parts such as a cholesteric liquid crystal layer, an alignment film, a display electrode, a part of lead electrodes and the like by a double-layer substrate and a sealing ring.
The first cholesteric liquid crystal cell and the second cholesteric liquid crystal cell are applied with PM drive waveforms, and display is realized by applying drive signals through a common or partially common scanning electrode and respective data electrodes;
under the working state, under the action of an electric field, the liquid crystal layers of the corresponding scanning electrodes in the first cholesteric liquid crystal box and the second cholesteric liquid crystal box start to form a focal conic state or a plane state at the same time.
The cholesteric liquid crystal molecular pitch of the first cholesteric liquid crystal cell is shorter than the cholesteric liquid crystal molecular pitch of the second cholesteric liquid crystal cell. In general, when cholesteric liquid crystal molecules are in a focal conic alignment state, the shorter the pitch, the higher the transmittance. In the case of the color electronic paper in which the respective display units are superimposed, the display units facing the observer have high transmittance in order to be advantageous in improving the reflectance of the subsequent display units.
The sub-pixel shapes of the first cholesteric liquid crystal cell, the second cholesteric liquid crystal cell and the electrophoresis layer are similar or identical, and the deviation of the outline is less than 50 mu m.
The scanning electrodes shared by the first cholesteric liquid crystal box and the second cholesteric liquid crystal box consist of two scanning electrodes respectively positioned on the first cholesteric liquid crystal box and the second cholesteric liquid crystal box, and the two scanning electrodes are connected through a COG+FPC or COF or TAB mode.
The cog+fpc method means that one end of a scan electrode of a cholesteric liquid crystal cell is connected to a drive IC, and the other end of the scan electrode is connected to a corresponding scan electrode of another cholesteric liquid crystal cell. When the scan electrode portions of two cholesteric liquid crystal cells are in one-to-one correspondence, i.e. one cholesteric liquid crystal cell has more scan electrodes than the other cholesteric liquid crystal cell, the start and end scan electrodes of the cholesteric liquid crystal cell with few scan electrodes are typically connected to the start or end scan electrodes of the cholesteric liquid crystal cell with more scan electrodes. Other corresponding connection modes are also possible, but the scanning electrodes of the cholesteric liquid crystal box with few scanning electrodes are connected with the scanning electrodes of the other cholesteric liquid crystal box. The data signals of the two cholesteric liquid crystal boxes are applied by different output ends of different driving ICs to drive pixels of the cholesteric liquid crystal boxes to realize display.
The PM driving waveforms applied to the corresponding two scan electrodes are generated by the same pin of the same driving chip.
The number of the scanning electrodes of the first cholesteric liquid crystal box is equal to or different from that of the second cholesteric liquid crystal box.
The bias voltages of the first cholesteric liquid crystal cell and the second cholesteric liquid crystal cell may not be optimal bias voltages. Specifically, it is assumed that the first cholesteric liquid crystal cell and the second cholesteric liquid crystal cell have first to n 1-th scanning electrodes and first to n 2-th scanning electrodes, respectively, and the start line (first line) of the scanning electrodes of the two cholesteric liquid crystal cells corresponds, the end lines (n 1 and n 2) corresponds, or the start line (first line) and the end line (n 1 or n 2) correspond one to one. n1 and n2 may be equal or unequal. The driving waveforms of the cholesteric liquid crystal cell and the electrophoresis layer are triggered to start scanning, and the refresh frequencies of the rows and the columns can be different, and can be synchronous or asynchronous. The driving waveform of the cholesteric liquid crystal cell is usually generated according to the principle of the optimum bias method, and may be not the optimum value. When the number of lines is relatively large, only the selection voltage and the non-selection voltage can meet the generation of the plane state and the focal conic state. The driving waveform of the electrophoresis layer is composed of a series of positive and negative pulses, and the driving of the electrophoresis particles is realized.
The electrophoresis layer is positioned between the substrate of the second cholesteric liquid crystal box on the side close to the electrophoresis layer and the substrate of the driving backboard of the electrophoresis layer, and the periphery of the electrophoresis layer is enclosed by the sealing material. The electrophoretic layer has weak tolerance to water molecules, the service life of the electronic paper is improved by sealing, and the thickness of the substrate positioned on one side of the electrophoretic layer can be effectively reduced by means of the second cholesteric liquid crystal box.
The substitution of the first cholesteric liquid crystal cell, the second cholesteric liquid crystal cell and the electrophoretic layer for other non-cholesteric liquid crystal and non-electrophoretic electronic paper modes, such as smectic liquid crystal layer, electrochromic, electrowetting, etc. modes are equally applicable to the present invention.
Compared with the prior art, the three-layer structure is adopted to realize full-color electronic paper display, and compared with the prior three-dimensional color mixing technology, the three-layer structure has the advantages of large color mixing overlapping area of pixels, flexible segmentation of each pixel, and simple production process, and can widen the gray level of display; compared with the prior EPD technology, the EPD technology has the advantages of wide working temperature, wide color reproduction range and high refresh rate; compared with the prior cholesteric liquid crystal technology, the liquid crystal display has the advantages of high contrast ratio of black and white and wide color reproduction range; the color electronic paper with the three-layer superposition structure and the driving method thereof have the advantages of wide color reproduction range, easiness in mass production and the like, the equipment input cost of the color electronic paper is reduced overall, and the color electronic paper is expected to be widely applied.
Based on the reasons, the invention can be widely popularized in the fields of electronic paper technology and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort to a person skilled in the art.
Fig. 1 is a schematic structural diagram of three display units of a color electronic paper display device with a three-layer stacked structure according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a connection mode of cog+fpc in the embodiment of the invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order to highlight the point of the invention, only schematic diagrams of single pixel structural units are given in this embodiment, and all the constituent structures of the color electronic paper display device of the three-layer stacked structure are not listed one by one, and descriptions of electrophoretic liquid components, electrophoretic particle colors and charge polarities, spacer materials, seal part shapes and sizes, lead electrode distributions, data lines, scan lines, specific structures of test units and TFT driving units, and the like, which are well known to those skilled in the art, are omitted here, which do not affect understanding of the present invention.
As shown in fig. 1, the three-layer display unit of the single pixel of the color electronic paper display device with the three-layer stacked structure provided in this embodiment sequentially includes, from the viewing side, a first cholesteric liquid crystal layer 1, a second cholesteric liquid crystal layer 2, and an electrophoretic layer 3, and further includes an interface portion 4, a first cholesteric liquid crystal cell sealing portion, a lead electrode portion, or a driving portion (right side) 5, a second cholesteric liquid crystal cell sealing portion, a lead electrode portion, or a driving portion (right side) 6, an electrophoretic layer sealing portion, a lead electrode portion, or a driving portion (right side) 7, a first cholesteric liquid crystal cell sealing portion, a lead electrode portion, or a driving portion (left side) 8, a second cholesteric liquid crystal cell sealing portion, a lead electrode portion, or a driving portion (left side) 9, an electrophoretic layer sealing portion, a lead electrode portion, or a driving portion (left side) 10, a first substrate 11, a second substrate 12, a third substrate 13, a fourth substrate 14, a fifth substrate 15, a driving 16, first cholesteric liquid crystal cell molecules 17, second cholesteric liquid crystal cells molecules 18, a second substrate 19, and a third substrate 13, and a third adhesive layer 20; a second adhesive layer 21 between the fourth substrate 14 and the fifth substrate 15. The alignment films and data electrodes corresponding to the first cholesteric liquid crystal layer 1 and the second cholesteric liquid crystal layer 2 are omitted in fig. 1, the electrophoretic particles 19 are red electrophoretic particles, black electrophoretic particles, white electrophoretic particles, respectively, and the drive back plate 16 is composed of a drive unit, a display electrode, a scanning line, a data line, and the like, which are attached to a glass or plastic substrate. Wherein, the first substrate 11, the second substrate 12, the third substrate 13, the fourth substrate 14 and the fifth substrate 15 are all PET transparent substrates with the thickness of 100 micrometers; the first substrate 11, the second substrate 12, the third substrate 13, the fourth substrate 14, and the fifth electrode 15 use ITO transparent electrode materials, and have a thickness of 2000 angstroms. The thickness of the first cholesteric liquid crystal layer 1 is 4 μm and the liquid crystal material is MDA-00-1445. The second cholesteric liquid crystal layer 2 uses MDA series of double bottle systems MDA-00-1444 and MDA-00-1445 liquid crystals, and the proportion of the cholesteric liquid crystals is MDA-00-1444 (20%) and MDA-00-1445 (80%).
The sub-pixels of the first cholesteric liquid crystal cell and the second cholesteric liquid crystal cell are square, and have a side length of 100 μm and a pixel pitch of 10 μm. The error of each edge of the corresponding two sub-pixels from the overlapping center of the two sub-pixels is less than 10%. The subpixels of the electrophoretic layer 3 are square and have a side length of 50 μm and a pixel pitch of 5 μm. The number ratio of the first cholesteric liquid crystal cell to the second cholesteric liquid crystal cell to the number of the subpixels of the electrophoresis layer 3 is 1:1:4. Fig. 2 shows a schematic diagram of the connection scheme of cog+fpc. The data lines and scan electrode drives in the first cholesteric liquid crystal cell, the second cholesteric liquid crystal cell are all driven using an IST3025 chip. The scanning electrodes of the first cholesteric liquid crystal box and the second cholesteric liquid crystal box are all connected in a one-to-one correspondence. The PM driving waveforms applied to the corresponding two scan electrodes are generated by the same pin of the same driving chip. The two scan electrodes are connected by an FPC portion 22. The driving method of electrophoresis uses COG mode, and COG portion 23 for driving cholesteric liquid crystal and COG portion 24 for driving electrophoresis layer are connected via interface portion 25 of cog+fpc.
The scope of the present invention broadly covers variations in various shapes including arrangement of sub-pixels and number of sub-pixels, variations in the kinds and mixing ratio of liquid crystal molecules of cholesteric liquid crystal cells, and variations in physical and chemical properties of pigment particles are essentially the same as the present invention. The superposition of two layers of cholesteric liquid crystal cells and one layer of electrophoresis from the viewing direction is emphasized here, and the two layers of cholesteric liquid crystal have partly or entirely identical scanning electrodes. Variations in the order of stacking the cholesteric liquid crystal cells and in the geometry of the electrophoretic layer, the manner of driving, and the number of particles in the electrophoretic layer are all encompassed by the present invention.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (8)
1. The color electronic paper display device with the three-layer superposition structure is characterized by comprising a plurality of pixels with three-layer display units;
the three-layer display unit of the pixel comprises a first cholesteric liquid crystal box, a second cholesteric liquid crystal box and an electrophoresis layer from the observation side;
the ratio of the sub-pixel area of the smaller area to the sub-pixel area of the larger area in the sub-pixels of each layer of display units of the pixel is 1: n, the number ratio is N:1, wherein the outline of N sub-pixels with smaller areas are arranged together and the outline of the sub-pixels with larger areas are the same or similar, and N is a positive integer;
the electrophoresis layer comprises two or more than two kinds of electrophoresis particles, and the electrophoresis layer is provided with an independent AM driving structure for realizing the change of the graph;
the first cholesteric liquid crystal cell and the second cholesteric liquid crystal cell are applied with PM drive waveforms, and display is realized by applying drive signals through a common or partially common scanning electrode and respective data electrodes;
under the working state, under the action of an electric field, the liquid crystal layers of the corresponding scanning electrodes in the first cholesteric liquid crystal box and the second cholesteric liquid crystal box start to form a focal conic state or a plane state at the same time.
2. The three-layer stacked structure color electronic paper display device of claim 1, wherein a cholesteric liquid crystal molecular pitch of the first cholesteric liquid crystal cell is shorter than a cholesteric liquid crystal molecular pitch of the second cholesteric liquid crystal cell.
3. The three-layered stacked structured color electronic paper display device of claim 1, wherein the sub-pixel shapes of the first cholesteric liquid crystal cell, the second cholesteric liquid crystal cell, and the electrophoretic layer are similar or identical, and the deviation of the outline is less than 50 μm.
4. The color electronic paper display device of three-layer stacked structure according to claim 1, wherein the scan electrode shared by the first cholesteric liquid crystal cell and the second cholesteric liquid crystal cell is composed of two scan electrodes respectively positioned on the first cholesteric liquid crystal cell and the second cholesteric liquid crystal cell, and connection between the two scan electrodes is realized by cog+fpc or COF or TAB.
5. The three-layered stacked color electronic paper display device of claim 4, wherein the PM driving waveforms applied to the corresponding two scan electrodes are generated by the same driving chip and the same pin.
6. The three-layered stacked structured color electronic paper display device of claim 1, wherein the number of scan electrodes of the first cholesteric liquid crystal cell and the number of scan electrodes of the second cholesteric liquid crystal cell are equal or unequal.
7. The three-layer stacked structure color electronic paper display device of claim 1, wherein the bias voltages of the first cholesteric liquid crystal cell and the second cholesteric liquid crystal cell may not be optimal bias voltages.
8. The color electronic paper display device of three-layer stacked structure according to claim 1, wherein the electrophoretic layer is located between a substrate of the second cholesteric liquid crystal cell on a side close to the electrophoretic layer and a substrate of a driving back plate of the electrophoretic layer, and the periphery thereof is surrounded and closed by a sealing material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810095567.XA CN108037625B (en) | 2018-01-31 | 2018-01-31 | Color electronic paper display device with three-layer superposition structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810095567.XA CN108037625B (en) | 2018-01-31 | 2018-01-31 | Color electronic paper display device with three-layer superposition structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108037625A CN108037625A (en) | 2018-05-15 |
| CN108037625B true CN108037625B (en) | 2023-08-15 |
Family
ID=62096972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810095567.XA Active CN108037625B (en) | 2018-01-31 | 2018-01-31 | Color electronic paper display device with three-layer superposition structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108037625B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109491155B (en) * | 2019-01-08 | 2021-12-17 | 京东方科技集团股份有限公司 | Display panel, manufacturing method thereof and display device |
| CN110286533B (en) * | 2019-05-31 | 2021-11-19 | 上海天马微电子有限公司 | Display device |
| CN110322844A (en) * | 2019-07-10 | 2019-10-11 | 京东方科技集团股份有限公司 | A kind of electrophoretic display apparatus and its display methods for realizing more grayscale colours |
| CN114089568A (en) * | 2020-07-29 | 2022-02-25 | 京东方科技集团股份有限公司 | Electronic paper display screen, preparation method thereof and display device |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1914031A (en) * | 2004-01-28 | 2007-02-14 | 肯特显示器公司 | Drapable liquid crystal transfer display films |
| CN101957521A (en) * | 2010-08-12 | 2011-01-26 | 大连东方科脉电子有限公司 | High-contrast liquid crystal electronic paper displayer and manufacturing method thereof |
| CN102162952A (en) * | 2011-04-29 | 2011-08-24 | 大连东方科脉电子有限公司 | Full-color cholesteric liquid crystal electronic paper |
| CN102193224A (en) * | 2010-03-15 | 2011-09-21 | 上海天马微电子有限公司 | Display panel and display driving method thereof |
| CN102591087A (en) * | 2012-03-14 | 2012-07-18 | 大连东方科脉电子有限公司 | 3D (three-dimensional) mixed-color electronic paper |
| CN106054426A (en) * | 2016-08-15 | 2016-10-26 | 大连东方科脉电子股份有限公司 | Grayscale electronics-paper |
| CN207780440U (en) * | 2018-01-31 | 2018-08-28 | 大连东方科脉电子股份有限公司 | A kind of color electronic paper display device of three layers of overlaying structure |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7737928B2 (en) * | 2003-07-02 | 2010-06-15 | Kent Displays Incorporated | Stacked display with shared electrode addressing |
| KR101587124B1 (en) * | 2009-09-23 | 2016-01-21 | 삼성디스플레이 주식회사 | Liquid crystal display including the same |
| KR101711144B1 (en) * | 2010-10-05 | 2017-03-02 | 삼성전자주식회사 | Cholesteric liquid crystal display device and method of manufacturing the same |
-
2018
- 2018-01-31 CN CN201810095567.XA patent/CN108037625B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1914031A (en) * | 2004-01-28 | 2007-02-14 | 肯特显示器公司 | Drapable liquid crystal transfer display films |
| CN102193224A (en) * | 2010-03-15 | 2011-09-21 | 上海天马微电子有限公司 | Display panel and display driving method thereof |
| CN101957521A (en) * | 2010-08-12 | 2011-01-26 | 大连东方科脉电子有限公司 | High-contrast liquid crystal electronic paper displayer and manufacturing method thereof |
| CN102162952A (en) * | 2011-04-29 | 2011-08-24 | 大连东方科脉电子有限公司 | Full-color cholesteric liquid crystal electronic paper |
| CN102591087A (en) * | 2012-03-14 | 2012-07-18 | 大连东方科脉电子有限公司 | 3D (three-dimensional) mixed-color electronic paper |
| CN106054426A (en) * | 2016-08-15 | 2016-10-26 | 大连东方科脉电子股份有限公司 | Grayscale electronics-paper |
| CN207780440U (en) * | 2018-01-31 | 2018-08-28 | 大连东方科脉电子股份有限公司 | A kind of color electronic paper display device of three layers of overlaying structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108037625A (en) | 2018-05-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108037625B (en) | Color electronic paper display device with three-layer superposition structure | |
| US7190337B2 (en) | Multi-configuration display driver | |
| US10690983B2 (en) | Reflective display and preparation method thereof | |
| US10372008B2 (en) | Electro-optic displays | |
| US7649669B2 (en) | Display device | |
| US10509246B2 (en) | Display panel and driving and manufacturing method thereof, and display device | |
| JP4915418B2 (en) | Display element, electronic paper including the same, electronic terminal device including the display element, display system including the display element, and image processing method for the display element | |
| KR20070112349A (en) | Transflective liquid crystal display device | |
| TW201333614A (en) | Electrophoretic display | |
| JPWO2007116438A1 (en) | Liquid crystal display element, driving method thereof, and electronic paper including the same | |
| US11868020B2 (en) | Electrophoretic display device | |
| CN102466914B (en) | Smectic state liquid crystal color display | |
| CN111025748A (en) | Liquid crystal display device | |
| US6414666B1 (en) | Liquid crystal display device and method of driving a liquid crystal display element | |
| CN207780440U (en) | A kind of color electronic paper display device of three layers of overlaying structure | |
| US11257448B2 (en) | Liquid crystal display device and control method thereof | |
| WO2009122630A1 (en) | Liquid crystal display device and method for driving the same | |
| US20050185123A1 (en) | Black and white color cholesteric liquid crystal display | |
| JP2022024991A (en) | Liquid crystal display device | |
| TW201319706A (en) | Pixel structure | |
| US8059251B2 (en) | Multilayered cell, electronic terminal, and method of filling multilayered cell with media | |
| JPH10104654A (en) | Reflection type black-and-white liquid crystal display device | |
| JP2012108347A (en) | Reflection type color liquid crystal display element and reflection type color liquid crystal display device | |
| US11009761B2 (en) | Grayscale color electronic paper | |
| CN114967218B (en) | Double-sided display screen and display |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 314100 room 130, building 2, No. 16, Fuxing Avenue, Xitang Town, Jiashan County, Jiaxing City, Zhejiang Province Applicant after: Zhejiang Dongfang Kemai Electronics Co.,Ltd. Address before: 116000 No. 20, Liaohe East Road, shuangd port, Jinzhou new area, Dalian, Liaoning Applicant before: DALIAN DKE LCD Co.,Ltd. |
|
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: No. 1999 Xihan Avenue, Xitang Town, Jiashan County, Jiaxing, Zhejiang Province 314100 Applicant after: Zhejiang Dongfang Kemai Electronics Co.,Ltd. Address before: 314100 room 130, building 2, No. 16, Fuxing Avenue, Xitang Town, Jiashan County, Jiaxing City, Zhejiang Province Applicant before: Zhejiang Dongfang Kemai Electronics Co.,Ltd. |
|
| CB02 | Change of applicant information | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |