CN117784486B - Bistable display unit and reflective display device comprising same - Google Patents
Bistable display unit and reflective display device comprising same Download PDFInfo
- Publication number
- CN117784486B CN117784486B CN202311853732.0A CN202311853732A CN117784486B CN 117784486 B CN117784486 B CN 117784486B CN 202311853732 A CN202311853732 A CN 202311853732A CN 117784486 B CN117784486 B CN 117784486B
- Authority
- CN
- China
- Prior art keywords
- lower substrate
- insulating layer
- layers
- layer
- substrate
- 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
- 239000000758 substrate Substances 0.000 claims abstract description 158
- 239000004973 liquid crystal related substance Substances 0.000 claims description 33
- 229910052751 metal Inorganic materials 0.000 claims description 19
- 239000002184 metal Substances 0.000 claims description 19
- 150000002739 metals Chemical class 0.000 claims description 18
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 7
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 6
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 6
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 6
- 229910000838 Al alloy Inorganic materials 0.000 claims description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052804 chromium Inorganic materials 0.000 claims description 5
- 239000011651 chromium Substances 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- 229910052750 molybdenum Inorganic materials 0.000 claims description 5
- 239000011733 molybdenum Substances 0.000 claims description 5
- 229910052759 nickel Inorganic materials 0.000 claims description 5
- 229910052716 thallium Inorganic materials 0.000 claims description 5
- BKVIYDNLLOSFOA-UHFFFAOYSA-N thallium Chemical compound [Tl] BKVIYDNLLOSFOA-UHFFFAOYSA-N 0.000 claims description 5
- 238000005429 filling process Methods 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 2
- 239000003292 glue Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 2
- 238000002834 transmittance Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 6
- 238000002310 reflectometry Methods 0.000 abstract description 6
- 239000010410 layer Substances 0.000 description 161
- 239000004986 Cholesteric liquid crystals (ChLC) Substances 0.000 description 48
- 210000002858 crystal cell Anatomy 0.000 description 16
- 239000000463 material Substances 0.000 description 16
- 239000011521 glass Substances 0.000 description 11
- 210000004027 cell Anatomy 0.000 description 9
- 239000002356 single layer Substances 0.000 description 5
- 239000010408 film Substances 0.000 description 4
- 239000011229 interlayer Substances 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 239000000565 sealant Substances 0.000 description 4
- 239000003086 colorant Substances 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000005530 etching Methods 0.000 description 3
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 3
- 239000004926 polymethyl methacrylate Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 229920001940 conductive polymer Polymers 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000000206 photolithography Methods 0.000 description 2
- 229920000768 polyamine Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000000427 thin-film deposition Methods 0.000 description 2
- UWCWUCKPEYNDNV-LBPRGKRZSA-N 2,6-dimethyl-n-[[(2s)-pyrrolidin-2-yl]methyl]aniline Chemical compound CC1=CC=CC(C)=C1NC[C@H]1NCCC1 UWCWUCKPEYNDNV-LBPRGKRZSA-N 0.000 description 1
- 239000004988 Nematic liquid crystal Substances 0.000 description 1
- 229920001609 Poly(3,4-ethylenedioxythiophene) Polymers 0.000 description 1
- 239000004990 Smectic liquid crystal Substances 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000003098 cholesteric effect Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 239000002355 dual-layer Substances 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000003094 microcapsule Substances 0.000 description 1
- 239000002052 molecular layer Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 238000002294 plasma sputter deposition Methods 0.000 description 1
Landscapes
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Liquid Crystal (AREA)
Abstract
The invention provides a bistable display unit and a reflective display device comprising the same, wherein the bistable display unit comprises a first upper substrate, a first lower substrate and an electrochromic layer positioned between the first upper substrate and the first lower substrate; the first lower substrate comprises at least a plurality of grid driving layers, a first insulating layer, a plurality of signal layers, a second insulating layer and pixel electrodes; the pixel electrode is an opening area in a corresponding area on the first lower substrate. And the light transmittance of the opening area is improved on the premise that the driving display of the bistable display unit is not influenced by reserving at most one layer of the first insulating layer or the second insulating layer at the part of the first lower substrate corresponding to the opening area, so that the enhancement of the reflectivity of the reflective display device is finally realized, and the display effect is improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a bistable display unit and a reflective display device comprising the bistable display unit.
Background
Bistable display technology has been increasingly emphasized in recent years due to the low power consumption characteristic. The display device using bistable display technology commonly includes electronic ink screen, liquid crystal display, etc., wherein the liquid crystal molecules or electrophoretic particles contained in the bistable display device have bistable characteristics, so that the picture can be maintained after power failure.
Taking a cholesteric liquid crystal display device in a liquid crystal display as an example, the cholesteric liquid crystal display device containing cholesteric liquid crystal molecules can reflect light with a certain wavelength by means of a twisted liquid crystal layer to achieve a certain display effect. Among the numerous light waves reflected by the cholesteric liquid crystal layer, the wavelength satisfiesBragg reflection occurs in the part of circularly polarized light, wherein n is the average refractive index in a liquid crystal plane, and P is the pitch which can be adjusted by adjusting the content of the chiral agent of the liquid crystal. At this wavelength, only circularly polarized light of one handedness is reflected, light of the other handedness is transmitted, and light that does not meet this wavelength range is also transmitted. Thus, generally a liquid crystal material can only achieve reflection of light of a single color.
The main structure of a typical single-layer cholesteric liquid crystal display device is shown in fig. 1, which includes an upper substrate, a lower substrate, and a liquid crystal layer between the two substrates, and the liquid crystal layer is sealed into a liquid crystal cell by a sealant. The upper substrate surface is mainly provided with a black matrix, a common electrode and a corresponding supporting structure, and the lower substrate surface is mainly provided with a pixel electrode, a grid driving line, a signal line, an insulating layer between metals and a transistor switch for controlling a single pixel. In a single pixel unit, as shown in fig. 2, the top view structure of the lower substrate included in the single pixel unit is an area surrounded by a grid signal line and a vertical signal line together, a transparent pixel electrode is arranged in the single pixel, and the pixel electrode is connected with the grid signal line and the vertical signal line through a transistor switch. When the pixel unit works, the transistor switch is turned on by the scanning voltage of the grid signal line and the vertical signal line, so that the pixel electrode is charged. The cross-section AA' of the pixel shown in fig. 2 is taken, and the cross-section structure of the pixel is shown in fig. 3, wherein the gate driving line, the interlayer insulating layer and the vertical signal line are sequentially arranged from the lower glass substrate upwards, the gate insulating layer is arranged on the upper layer of the vertical signal line, and the pixel electrode is arranged on the uppermost layer, so that two insulating layers exist in the pixel opening area, namely the transparent electrode area.
In some applications in the field of reflective displays, to achieve multicolor displays, it is common to use a multilayer liquid crystal cell stack. For example, as shown in fig. 4, in order to realize four-color display, the liquid crystal cell 1 and the liquid crystal cell 2 are stacked, and an ink layer is applied on the side of the lower glass substrate of the liquid crystal cell 2 away from the liquid crystal layer. The basic display principle of the multi-layer liquid crystal box is the same as that of the single-layer liquid crystal box, and the liquid crystal layers reflecting different colors of light and black ink at the bottom are used for realizing the display of black, white and other colors. For example, a liquid crystal layer capable of reflecting cyan and red is used in a multi-layer liquid crystal cell, and black ink at the bottom is matched, so that display of four colors of black, white, cyan and red can be realized. However, because the multi-layer liquid crystal cells are stacked, each layer of liquid crystal cell is provided with two insulating layers, and the light transmittance of the insulating layers is generally about 90%, and the light transmittance of the insulating layers is different in the visible light wave band, so that light needs to penetrate through the multi-layer glass substrate, the film structure and the insulating layers, the reflectivity of the whole device is reduced, the displayed color is also changed to a certain extent, and the reflectivity and the color of the whole cholesteric display device are affected.
Disclosure of Invention
In order to solve the problems of reduced reflectivity and poor display effect of a display device caused by superposition of a plurality of liquid crystal boxes, the invention provides a bistable display unit and a reflective display device comprising the bistable display unit.
A bistable display unit comprises a first upper substrate, a first lower substrate and an electrochromic layer between the first upper substrate and the first lower substrate; wherein, a common electrode is arranged on one side of the first lower substrate close to the electrochromic layer, and one side of the first lower substrate close to the electrochromic layer at least comprises:
a plurality of gate driving layers disposed on the first lower substrate;
The first insulating layer is arranged on the plurality of gate driving layers and covers the gate driving layers;
the signal layers are arranged on the first insulating layer;
the second insulating layer is arranged on the signal layers and covers the signal layers; and
The pixel electrode is arranged on the first lower substrate and corresponds to an opening area formed by the grid driving layers and the signal layers; wherein the part corresponding to the opening area comprises at most one layer of the first insulating layer or the second insulating layer.
In some embodiments of the present invention, the first insulating layer and the second insulating layer are absent from a portion of the first lower substrate corresponding to the opening region.
In some embodiments of the present invention, the materials of the first insulating layer and the second insulating layer may be selected from insulating materials having a light transmittance of up to 90% which are well known to those skilled in the art, and may be at least one of silicon nitride, silicon oxide, aluminum oxide, yttrium oxide, resin, polyamine or a composite insulating layer combining inorganic and organic materials, preferably at least one of silicon nitride, silicon oxide, aluminum oxide and yttrium oxide.
In some embodiments of the present invention, the plurality of gate driving layers are disposed in parallel in a first direction of the first lower substrate.
In some embodiments of the present invention, the plurality of signal layers are disposed in parallel in a second direction of the first lower substrate. In some embodiments of the present invention, the materials of the gate driving layers are molybdenum, chromium, copper, aluminum, nickel, thallium, aluminum alloys, or combinations thereof.
In some embodiments of the invention, the material of the signal layers is molybdenum, chromium, copper, aluminum, nickel, thallium, an aluminum alloy, or a combination of the foregoing metallic materials.
In some embodiments of the present invention, in order to shield the light leakage region on the first upper substrate, the first upper substrate may further be provided with a black matrix.
In some embodiments of the invention, the black matrix is disposed between the first upper substrate base plate and the common electrode.
In some embodiments of the invention, the electrochromic layer is at least one of a charged particle layer or a liquid crystal molecular layer.
In some embodiments of the present invention, the bistable display unit is prepared by a process comprising the steps of:
s1: providing a first substrate, and forming a common electrode on the first upper substrate; providing a first lower substrate, and forming the gate driving layers on the first lower substrate;
s2: forming the first insulating layer on the gate driving layer;
s3: forming the plurality of signal layers on the first insulating layer in the step S2, wherein non-shading parts formed by the plurality of gate driving layers and the plurality of signal layers together form an opening area which is arrayed on the first lower substrate;
s4: removing the first insulating layer corresponding to the opening area in the step S2, and forming the second insulating layers on the plurality of signal layers;
S5: forming the pixel electrode on the first lower substrate obtained in the step S4 at the position corresponding to the opening area;
S6: and packaging charged particles or liquid crystal molecules in a closed space formed by the first upper substrate, the first lower substrate and the sealing glue through a filling process to form an electrochromic layer, thus obtaining the bistable display unit.
In some embodiments of the present invention, when the bistable display cell is manufactured, the second insulating layer corresponding to the opening region on the signal layer is entirely or partially removed in S4.
In some embodiments of the present invention, the processing means of the common electrode, the plurality of gate driving layers, the plurality of signal layers, the first insulating layer, the second insulating layer, and the pixel electrode may be one of plasma sputtering, exposure, and etching, and in addition, other suitable processing technologies in the technical field may be selected according to the metal type used, which is not limited herein.
The bistable display unit is applied to a reflective display device in a single layer or a plurality of layers stacked.
The beneficial effects are that: according to the invention, the coverage area of the first insulating layer and the second insulating layer on the first lower substrate in the bistable display unit is changed, namely, the first insulating layer and the second insulating layer in the corresponding area (opening area) of the pixel electrode are partially or completely removed, so that the light transmittance of the corresponding area (opening area) of the pixel electrode in the bistable display unit is improved on the premise of not influencing signal driving, the pixel display is clearer and more colorful, and the pixel display is applied to a reflective display device, so that the reflectivity of the whole display device can be improved, and the display effect is optimized.
Drawings
Fig. 1: schematic structural diagram of common single-layer cholesteric liquid crystal display unit;
fig. 2: a top view of the lower substrate of the cholesteric liquid crystal display unit shown in fig. 1;
fig. 3: FIG. 2 is a schematic cross-sectional view of the lower substrate at AA';
fig. 4: simple and easy schematic diagram of structure of common double-deck bistable cholesteric liquid crystal display device;
Fig. 5: the cross section schematic diagram of the first lower substrate in the bistable display unit is shown in the invention;
Fig. 6: a schematic structure of a single-layer bistable cholesteric liquid crystal display cell 600a according to an embodiment of the invention;
Fig. 7: in another embodiment of the present invention, a structure of the bistable cholesteric liquid crystal cell is shown.
In the figure: 100: external light; 200: a first wavelength of light; 300: a second wavelength of light; 400: a third wavelength of light; 500: a fourth wavelength of light; 101: an upper substrate; 102: sealing; 103: a lower substrate; 104: liquid crystal molecules; 201: a pixel electrode; 202: a gate signal line; 203: a vertical signal line; 204: a transistor switch; 301: a lower glass substrate; 302: an interlayer insulating layer; 303: a gate insulating layer; 401: a first upper glass substrate; 402: a first liquid crystal layer; 403: a first lower glass substrate; 404: a second upper glass substrate; 405: a second liquid crystal layer; 406: a second lower glass substrate; 407: an ink layer; 501: a first lower substrate base; 502: a first insulating layer; 503: a signal layer; 504: a second insulating layer; 601: a first upper substrate base plate; 602: a first electrochromic layer; 603: a first cholesteric liquid crystal molecule; 604: a second upper substrate base plate; 605: a second lower substrate base plate; 606: a second electrochromic layer; 607: and second cholesteric liquid crystal molecules.
Detailed Description
In the following text, the dimensions (e.g., length, width, thickness and depth) of elements (e.g., layers, films, substrates, regions, etc.) in the drawings are exaggerated in unequal proportions for clarity in the technical features of the present disclosure. Accordingly, the description and illustrations of the embodiments below are not limited to the dimensions and shapes presented by the elements of the drawings, but are intended to cover deviations in the dimensions, shapes, and both, as a result of actual processes and/or tolerances. For example, the planar surface shown in the figures may have rough and/or non-linear features, while the acute angles shown in the figures may be rounded. Accordingly, the elements presented in the drawings are intended to be schematic, and are not intended to accurately depict the actual shape of the elements, nor to limit the claims. Furthermore, the number of at least one element in the drawings may be significantly smaller than in actual cases, so that the description and explanation of the embodiments below is not limited to the number of elements in the drawings.
Further, the terms "about," "approximately" or "substantially" as used herein encompass not only the explicitly recited values and ranges of values, but also the allowable ranges of deviation as would be understood by one of ordinary skill in the art, wherein the range of deviation is determined by the error in the measurement, such as due to limitations in both the measurement system or process conditions. Further, "about" may mean within one or more standard deviations of the above values, for example: within ±30%, ±20%, ±10% or ±5%. The terms "about," "approximately" or "substantially" as used herein may be used to select an acceptable range of deviations or standard deviations based on optical, etching, mechanical or other properties, and not to cover all of these with a single standard deviation.
Referring to fig. 6, the bistable display element provided by the present invention includes a first upper substrate 601, a first lower substrate 501, and a first electrochromic layer 602 encapsulated between the first upper substrate 601 and the first lower substrate 501 by a sealant 102, wherein the first electrochromic layer 602 further includes first cholesteric liquid crystal molecules 603; a common electrode (not shown) is provided on the first upper substrate 601; a gate driving layer (not shown) is sequentially disposed on a side of the first lower substrate 501 adjacent to the first electrochromic layer 602 (due to a viewing angle problem), a first insulating layer 502, a signal line 503 (not shown), a second insulating layer 504, and a pixel electrode 201. It should be noted that the above description of "provided with" or "provided with" does not necessarily limit that the two are brought into contact.
In this embodiment, the first upper substrate 601 is a transparent substrate, and the material of the first upper substrate may be a rigid substrate, such as a glass plate or a PMMA substrate, or may be a flexible substrate, such as a substrate made of PI or PET as a main component. In addition to the above-exemplified materials, the first upper substrate 601 may be a rigid substrate or a flexible substrate made of other materials. Here, the constituent material of the first upper substrate 401 is not limited to the above-exemplified material.
In this embodiment, the common electrode (not shown) on the first upper substrate 601 is a patterned film, which can be formed by thin film deposition and photolithography, and the material of the common electrode can be a transparent conductive material, i.e. Transparent Conductive Oxide (TCO) or conductive polymer, such as ITO, IZO, PEDOT.
In other embodiments, in order to achieve a better display effect, other structures, such as a black matrix, may be disposed on the first upper substrate 601, which is helpful for preventing light leakage, to improve contrast of pixel display, and the like, which is not strictly limited in the present invention.
In the present embodiment, the first lower substrate 501 may be the same as the first upper substrate 601, that is, the first lower substrate 501 may be a transparent substrate, and may be the above-mentioned rigid substrate (e.g., glass plate or PMMA substrate) or flexible substrate (PI substrate or PET substrate). However, in other embodiments, the first lower substrate 501 may also be an opaque substrate, for example, the first lower substrate 501 may be one of a black opaque PMMA substrate, PI substrate, or PET substrate.
In this embodiment, the material of the gate driving layer may be molybdenum, chromium, copper, aluminum, nickel, thallium, aluminum alloy, or a combination of the foregoing metal materials; the material of the signal layer 503 may be the same as that of the gate driving layer, that is, the signal layer 503 may be molybdenum, chromium, copper, aluminum, nickel, thallium, aluminum alloy, or a combination thereof, which is not limited thereto.
Illustratively, in the present embodiment, the first lower substrate 501 includes 5 first metals and 5 second metals, wherein the 5 first metals are disposed in parallel along a first direction of the first lower substrate 501 to form a gate driving layer (not shown) on the first lower substrate 501; the 5 second metals 504 are disposed in parallel along a second direction of the first lower substrate 501 to form the signal layer 503. In other embodiments, the number of first metals and second metals is any integer greater than 0, and the number of both is the same or different. In addition, the first metals may not be arranged in parallel, the second metals may not be arranged in parallel, and other arrangement modes which do not affect the transmission of the driving signal may be implemented. The first direction and the second direction may be perpendicular to each other or not perpendicular to each other, which is not strictly limited in this embodiment.
In this embodiment, 5 first metals and 5 second metals are staggered to form a network distribution, so that an opening area of array arrangement and a non-opening area outside the opening area are formed. A first insulating layer 502 and a second insulating layer 504 are not provided on the gate driving layer and the signal layer 503 at a portion corresponding to the opening region; wherein the first insulating layer 502 serves as interlayer isolation and the second insulating layer 504 serves as gate isolation. In this case, the material of the first insulating layer 502 may be silicon oxide, silicon nitride, aluminum oxide, yttrium oxide, or the like; the material of the second insulating layer 504 may be silicon nitride, silicon oxide, aluminum oxide, yttrium oxide, resin, polyamine, or a composite insulating layer combining inorganic and organic, which is not limited.
In other embodiments, the second insulating layer 504 is not disposed on the signal layer 503 in the area corresponding to the opening area, and the first insulating layer 502 may be disposed on the gate driving layer in all or part of the area corresponding to the opening area; or the first insulating layer 503 is not provided in the region corresponding to the opening region on the gate driving layer, and the second insulating layer 504 may be provided in whole or in part in the region corresponding to the opening region on the signal layer.
In this embodiment, the pixel electrode 201 is disposed on the portion of the first lower substrate 501 corresponding to the opening area, and like the above-mentioned common electrode, the pixel electrode 201 may be a patterned film layer, which may be formed by thin film deposition and photolithography, and the material of the pixel electrode may be a transparent conductive material, that is, a Transparent Conductive Oxide (TCO) or a conductive polymer, like the common electrode. In other embodiments, the pixel electrode 201 may also be disposed in the non-opening region.
In this embodiment, the first electrochromic layer 602 contains first cholesteric liquid crystal molecules 603, and in other embodiments, the first electrochromic layer 602 may also contain nematic or smectic liquid crystal molecules. When the bistable display element is used as an electrophoretic display device, the particles contained in the first electrochromic layer 602 may also be charged particles, and the form of the charged particles may be microcapsules, microcups, spin balls, and the like, which are not limited in this embodiment.
Referring to fig. 6, the bistable display unit may further include a sealant 102, wherein the sealant 102 is located between the first upper substrate 601 and the first lower substrate 501, and connects the first upper substrate 601 and the first lower substrate 501. The sealing compound 102 can surround the first electrochromic layer 602, so that the first cholesteric liquid crystal molecules 603 are sealed in the accommodating space defined by the first upper substrate 601, the first lower substrate 501 and the sealing compound 102, and leakage of the first cholesteric liquid crystal molecules 603 is prevented.
In this embodiment, when a potential difference (i.e., voltage) is generated between the common electrode on the first upper substrate 601 and the pixel electrode 201 of the first lower substrate 501 due to the electric conduction, a plurality of overlapping areas between the common electrode and the pixel electrode 201 generate an electric field, so as to change the arrangement of the first cholesteric liquid crystal molecules 603 in the first electrochromic layer 602 to be in a focal conic arrangement state or a planar arrangement state, wherein the overlapping areas substantially correspond to the pixel points of the bistable cholesteric liquid crystal display unit.
It should be noted that the potential difference generated between the common electrode on the first upper substrate 601 and the pixel electrode 201 of the first lower substrate 501 can control the gray level of the pixel, and the potential difference can be adjusted by using an external control element (not shown) electrically connected to the common electrode and the pixel electrode 201, wherein the external control element is, for example, a timing controller or a processor.
Referring to fig. 6, at this time, the first cholesteric liquid crystal molecules 603 are in a planar alignment state. When the external light 100 is incident on the bistable liquid crystal display cell 600a from the first upper substrate 601, the first cholesteric liquid crystal molecules 603 in the planar alignment state receive the external light 100 and reflect the first wavelength light 200 within the external light 100, so that the first cholesteric liquid crystal molecules 603 can generate the first wavelength light 200, which includes a specific first wavelength range. It should be noted that, although the first wavelength light 300 includes the first wavelength range, the first wavelength light 200 also includes other wavelength ranges outside the first wavelength range, so the first wavelength range is not equal to the entire wavelength range of the first wavelength light 200.
In this embodiment, the bistable cholesteric liquid crystal display cell 600a is prepared according to the following steps:
S1: providing a first upper substrate 601, and forming a common electrode on the first upper substrate 601; providing a first lower substrate 501, and forming 5 gate driving layers parallel to each other in a first direction on the first lower substrate 501;
S2: forming a first insulating layer 502 covering the gate driving layers on the 5 gate driving layers;
s3: forming 5 signal layers 503 parallel to each other on the first insulating layer 502 in a second direction of the first lower substrate 501; the non-light-shielding areas formed by the 5 gate driving layers and the 5 signal layers together form an opening area arranged in an array on the first lower substrate 501;
S4: removing the first insulating layer 502 covering the opening area portion by an etching process well known in the art, forming the second insulating layer 504 on the signal layer 503, and then removing the second insulating layer 504 covering the opening area portion;
s5: forming a pixel electrode 201 on a portion of the first lower substrate obtained in S4 corresponding to the opening region;
s6: and packaging the first cholesteric liquid crystal molecules 603 in a sealed space formed by the first upper substrate 601, the first lower substrate 501 and the sealing compound 102 through a filling process to form a first electrochromic layer 602, thus obtaining the bistable cholesteric liquid crystal display unit.
In other embodiments, the bistable cholesteric liquid crystal display cell is prepared in a similar manner to the present embodiment, except that the first insulating layer 502 and the second insulating layer 504 are formed: if the portion of the first insulating layer 502 in the opening area remains completely, in S4, the portion of the second insulating layer 504 in the opening area may be removed completely or partially; if the second insulating layer 504 remains entirely in the portion of the opening region, the portion of the first insulating layer 502 in the opening region may be entirely removed or partially removed in S4. The removal degree of the regions of the first insulating layer 502 and the second insulating layer 504 corresponding to the opening regions can be adaptively adjusted according to the requirements of the application scenario, which is not strictly limited in the embodiment.
Referring to fig. 7, in this embodiment, the bistable cholesteric liquid crystal display cell 600a and the conventional bistable cholesteric liquid crystal display cell are illustratively formed into a dual-layer liquid crystal cell structure by conventional means in the art, and the first lower substrate 501 of the bistable cholesteric liquid crystal display cell 600a is connected to the second upper substrate 604 of the conventional bistable cholesteric liquid crystal cell as a part of a display module of a reflective display device.
The first cholesteric liquid crystal molecules 603 included in the first layer of liquid crystal cell in fig. 7 are in a planar alignment state, and when the ambient light 100 is incident on the reflective display device from the first upper substrate 501 of the bistable cholesteric liquid crystal display cell 600a, the first electrochromic layer 602 containing the first cholesteric liquid crystal molecules 603 in the planar alignment state receives the ambient light 100, and the first wavelength light 200 in the ambient light 100 is reflected. Meanwhile, the light 300 with the second wavelength in the external light 100 passes through the first cholesteric liquid crystal molecules 603 and the first lower substrate 501 of the bistable cholesteric liquid crystal display unit 600a and passes through the pixel electrode 201, and at this time, the first insulating layer 502 and the second insulating layer 504 are not disposed on the upper and lower sides of the pixel electrode 201. The second wavelength light 300 is transmitted through the pixel electrode 201 and is incident on the second upper substrate 604 of the conventional bistable cholesteric liquid crystal cell. In a conventional bistable cholesteric liquid crystal cell, the second cholesteric liquid crystal molecules 607 in a planar alignment state receive the second wavelength light 300, reflect a third wavelength light 400 of the second wavelength light 300, and the third wavelength light 400 enters the first electrochromic layer 602 of the bistable cholesteric liquid crystal cell 600a and is reflected; while the fourth wavelength light 500 of the second wavelength light 300 is transmitted through the second cholesteric liquid crystal molecules 607. At this time, the first wavelength light ray 200 and the third wavelength light ray 400 can pass through the first upper substrate 501 and exit from the upper surface of the first upper substrate 501. Viewing the display screen of the reflective display device, that is, viewing the first upper substrate 501 from the direction Z1, a bright state screen formed by the first wavelength light ray 200 and the third wavelength light ray 400 can be seen.
The first wavelength light ray 200 and the third wavelength light ray 400 may be light rays having a specific color, such as red light, green light, or blue light, and the wavelength range thereof may be a wavelength range of a certain color light, such as a red wavelength range between 590nm and 740nm, a green wavelength range between 500nm and 590nm, or a blue wavelength range between 415nm and 500 nm. The first wavelength light ray 200 and the third wavelength light ray 400 can pass through the first upper substrate 601 and exit from the upper surface of the first upper substrate 601.
In this embodiment, because the material properties of the first insulating layer 502 and the second insulating layer 504 have the transmittance of 90% for the third wavelength light 400, if the first insulating layer 502 and the second insulating layer 504 are reserved in the corresponding area of the pixel electrode 201, only 81% of the third wavelength light 400 can reach the second upper substrate 604 after passing through the first lower substrate 501, and the light reflected by the second cholesteric liquid crystal molecules 607 in the second layer liquid crystal cell is reduced, so that the reflectivity of the reflective display device as a whole for incident light is reduced, and the implemented image effect is poor.
In this embodiment, in the first lower substrate 501, the first insulating layer 503 and the second insulating layer 505 are not present in the region corresponding to the pixel electrode 201, so that the third wavelength light 400 transmitted through the first lower substrate 501 has no excessive loss, and the light transmittance thereof can reach more than 90%, and finally exits from the upper surface of the first upper substrate 601 after being reflected by the second cholesteric liquid crystal molecules 607. Compared with the conventional double-layer cholesteric liquid crystal display device (the region corresponding to the pixel electrode 201 in the first lower glass substrate 403 still has the interlayer insulating layer 302 and the gate insulating layer 303), the reflective display device provided by the embodiment has higher color saturation and clearer image display.
In other embodiments, in the first lower substrate 501, the region (opening region) corresponding to the pixel electrode 201 does not have the first insulating layer 502, and the transmittance of the third wavelength light 400 transmitted through the first lower substrate 501 is about 90%, and the third wavelength light is finally emitted from the upper surface of the first upper substrate 601 after being reflected by the second cholesteric liquid crystal molecules 607. Compared with the common double-layer cholesteric liquid crystal display unit, the reflective display device containing the double-layer bistable cholesteric liquid crystal display element provided by the embodiment can realize high color saturation and clearer image display.
In other embodiments, in the first lower substrate 501, the second insulating layer 504 is not present in the region (the opening region) corresponding to the pixel electrode 201, and the transmittance of the third wavelength light 400 transmitted through the first lower substrate 501 is about 90%, and the third wavelength light is finally emitted from the upper surface of the first upper substrate 501 after being reflected by the second cholesteric liquid crystal molecules 607. Compared with the common double-layer cholesteric liquid crystal display device, the reflective display device containing the double-layer bistable cholesteric liquid crystal display element provided by the embodiment can realize high color saturation and clearer image display.
The present invention is not limited to the embodiments described above, but is not limited to the embodiments described above, and any simple modification, equivalent changes and modification made to the above embodiments according to the technical matter of the present invention can be made by those skilled in the art without departing from the scope of the technical solution of the present invention.
Claims (9)
1. A bistable display unit comprises a first upper substrate, a first lower substrate and an electrochromic layer positioned between the first upper substrate and the first lower substrate; the method is characterized in that a common electrode is arranged on one side of the first upper substrate close to the electrochromic layer, and one side of the first lower substrate close to the electrochromic layer at least comprises:
a plurality of gate driving layers disposed on the first lower substrate;
The first insulating layer is arranged on the plurality of gate driving layers and covers the plurality of gate driving layers;
the signal layers are arranged on the first insulating layer;
The second insulating layer is arranged on the signal layers and covers the signal layers; and
The pixel electrode is arranged on the first lower substrate and corresponds to an opening area formed by the grid driving layers and the signal layers;
Specifically, the first lower substrate comprises a plurality of first metals and a plurality of second metals, wherein the plurality of first metals are arranged in parallel along a first direction of the first lower substrate or the plurality of first metals are intersected to form the gate driving layer on the first lower substrate; the second metals are arranged in parallel along a second direction of the first lower substrate base plate or are intersected to form the signal layer; the first metals and the second metals are staggered to form a net-shaped distribution, so that an opening area in array arrangement and a non-opening area outside the opening area are formed;
wherein at most one layer of the first insulating layer or the second insulating layer is contained in a part corresponding to the opening area;
or on the first lower substrate, the part corresponding to the opening area does not contain the first insulating layer and the second insulating layer.
2. The bistable display unit of claim 1, wherein the first insulating layer is at least one of silicon nitride, silicon oxide, aluminum oxide, and yttrium oxide.
3. The bistable display unit of claim 1, wherein the second insulating layer is at least one of silicon nitride, silicon oxide, aluminum oxide, and yttrium oxide.
4. The bistable display unit of claim 1, wherein said gate drive layers are disposed in parallel in a first direction of said first underlying substrate.
5. The bistable display unit of claim 4, wherein said plurality of signal layers are disposed in parallel in a second direction of said first lower substrate.
6. The bistable display unit of claim 5, wherein said gate driving layers and said signal layers are made of molybdenum, chromium, copper, aluminum, nickel, thallium, aluminum alloys, or combinations thereof.
7. A method of manufacturing a bi-stable display unit according to any one of claims 1-6, comprising the steps of:
s1: providing a first upper substrate, and forming a common electrode on the first upper substrate; providing a first lower substrate, and forming the gate driving layers on the first lower substrate;
S2: forming the first insulating layer on the plurality of gate driving layers;
s3: forming the plurality of signal layers on the first insulating layer in the step S2, wherein non-shading parts formed by the plurality of gate driving layers and the plurality of signal layers together form an opening area which is arrayed on the first lower substrate;
s4: removing the first insulating layer corresponding to the opening area in the step S2, and forming the second insulating layers on the plurality of signal layers;
S5: forming the pixel electrode on the first lower substrate obtained in the step S4 at the position corresponding to the opening area;
S6: and packaging charged particles or liquid crystal molecules in a closed space formed by the first upper substrate, the first lower substrate and the sealing glue through a filling process to form an electrochromic layer, thus obtaining the bistable display unit.
8. The process of manufacturing a bistable display element according to claim 7, wherein in S4, said second insulating layer corresponding to said opening area is entirely or partially removed.
9. A reflective display device comprising the bi-stable display element of any of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311853732.0A CN117784486B (en) | 2023-12-29 | 2023-12-29 | Bistable display unit and reflective display device comprising same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311853732.0A CN117784486B (en) | 2023-12-29 | 2023-12-29 | Bistable display unit and reflective display device comprising same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117784486A CN117784486A (en) | 2024-03-29 |
| CN117784486B true CN117784486B (en) | 2024-08-27 |
Family
ID=90396207
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311853732.0A Active CN117784486B (en) | 2023-12-29 | 2023-12-29 | Bistable display unit and reflective display device comprising same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117784486B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101114612A (en) * | 2006-07-28 | 2008-01-30 | 株式会社半导体能源研究所 | Method for manufacturing dispaly device |
| CN102385208A (en) * | 2010-09-02 | 2012-03-21 | 介面光电股份有限公司 | Electrochromism module and display combined with same |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472648B (en) * | 2013-08-30 | 2016-06-15 | 京东方科技集团股份有限公司 | A kind of electrochromic device and preparation method thereof and display device |
| TWI560503B (en) * | 2015-01-30 | 2016-12-01 | Innolux Corp | Display panel |
| CN104777693B (en) * | 2015-04-28 | 2017-05-03 | 深圳市华星光电技术有限公司 | High-transparency PSVA (polymer-stabilized vertical alignment) type liquid crystal display panel and manufacturing method thereof |
-
2023
- 2023-12-29 CN CN202311853732.0A patent/CN117784486B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101114612A (en) * | 2006-07-28 | 2008-01-30 | 株式会社半导体能源研究所 | Method for manufacturing dispaly device |
| CN102385208A (en) * | 2010-09-02 | 2012-03-21 | 介面光电股份有限公司 | Electrochromism module and display combined with same |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117784486A (en) | 2024-03-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7570323B2 (en) | Color filter substrate, liquid crystal display apparatus including color filter substrate, and method of manufacturing color filter substrate | |
| JP3806104B2 (en) | Transflective liquid crystal display device and manufacturing method thereof | |
| US6693692B1 (en) | Liquid crystal display | |
| KR100710166B1 (en) | Liquid crystal display device and method for fabricating the same | |
| WO2000048039A1 (en) | Liquid-crystal display | |
| CN210864284U (en) | Reflective cholesterol liquid crystal display | |
| EP1189098B1 (en) | Liquid crystal device and electronic apparatus provided with the same | |
| TWI776828B (en) | Display device and manufacturing method thereof | |
| US8179507B2 (en) | Liquid crystal display device | |
| CN109799641A (en) | A kind of array substrate and preparation method thereof, liquid crystal display panel | |
| JP2005031662A (en) | Array substrate, method for manufacturing the same, and liquid crystal display device having the same | |
| US7126658B2 (en) | Liquid crystal display device and electronic apparatus having particular dot regions | |
| CN117784486B (en) | Bistable display unit and reflective display device comprising same | |
| US20050157231A1 (en) | Transflective mode liquid crystal display | |
| JP5109424B2 (en) | Reflective display device | |
| US7570329B2 (en) | LCD panel and electronic device using the same | |
| US7369194B2 (en) | Fringe field switching liquid crystal display | |
| TWI326785B (en) | ||
| JP7352480B2 (en) | display device | |
| US8094248B2 (en) | Liquid crystal display device | |
| US20050140902A1 (en) | In plane switching liquid crystal display with transflector | |
| KR102380331B1 (en) | In Plane Switching Type Liquid Crystal Display Having Ultra High Transmittance Rate | |
| JP3557933B2 (en) | Liquid crystal device and electronic equipment using the same | |
| KR20030057218A (en) | Liquid crystal display device having a reflective mode | |
| WO2024198130A1 (en) | Display panel and electronic terminal |
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 | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20240708 Address after: 237000 Building A2, University Science and Technology Park, Sanshipu Town, Jin'an District, Lu'an City, Anhui Province Applicant after: Anhui Yutu Technology Co.,Ltd. Country or region after: China Address before: No. 19 Changqing Road, Changle Town, Haimen District, Nantong City, Jiangsu Province, 226121 Applicant before: Nantong Xinluotu Electronic Technology Co.,Ltd. Country or region before: China |
|
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20240729 Address after: Room 913, Building 3, Tianjie Commercial Center, No. 286 Wulishan Road, Xinzhan District, Hefei City, Anhui Province, China 230000 Applicant after: Anhui Qianyumi Material Technology Co.,Ltd. Country or region after: China Address before: 237000 Building A2, University Science and Technology Park, Sanshipu Town, Jin'an District, Lu'an City, Anhui Province Applicant before: Anhui Yutu Technology Co.,Ltd. Country or region before: China |
|
| TA01 | Transfer of patent application right | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |