CN108957813B - Reflective display and manufacturing method thereof - Google Patents
Reflective display and manufacturing method thereof Download PDFInfo
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- CN108957813B CN108957813B CN201810969956.0A CN201810969956A CN108957813B CN 108957813 B CN108957813 B CN 108957813B CN 201810969956 A CN201810969956 A CN 201810969956A CN 108957813 B CN108957813 B CN 108957813B
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- 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
- G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/139—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
- G02F1/1391—Bistable or multi-stable liquid crystal cells
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- 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
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- 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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
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- Nonlinear Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
- Mathematical Physics (AREA)
Abstract
The invention discloses a reflective display, which comprises a first substrate, a second substrate and a cholesterol liquid crystal layer clamped between the first substrate and the second substrate; the first substrate is provided with a first conductive layer and a light absorption layer; the second substrate is provided with a color film layer, and the color film layer comprises a plurality of first quantum color layers, a plurality of second quantum color layers and a plurality of light holes; ambient light is emitted into the interior of the reflective display through the light hole; when the cholesterol liquid crystal layer is in a planar state, light with specific wavelength can be reflected, the first quantum color layer and the second quantum color layer respectively absorb the light reflected by the cholesterol liquid crystal layer, convert the light into light with different wavelength and emit the light, and the light reflected by the cholesterol liquid crystal layer is emitted through the light holes, so that color display is realized; when the cholesterol liquid crystal layer is in a focal conic state, the light emitted into the reflective display is scattered by the cholesterol liquid crystal layer and absorbed by the light absorption layer to display a black state; the invention also discloses a manufacturing method of the reflective display.
Description
Technical Field
The invention relates to the technical field of display, in particular to a reflective display and a manufacturing method thereof.
Background
In the current reflective display, the best color is the cholesteric liquid crystal display (Ch-LCD), which can improve the brightness and light utilization without the need of polarizer and color film.
The cholesteric liquid crystal has bistable states including planar (planar) state capable of reflecting ambient light and focal-conic (focal-conic) state capable of scattering ambient light, as shown in fig. 1, and can be switched in different states by using an electric field, and the stable state can be maintained by canceling the electric field after the switching is completed.
Two ways of colorizing cholesteric lcds are the three-layer stack structure proposed by Kent Display or Fujitsu (Fujitsu) in usa (as shown in fig. 2); the second is a single-layer colorization structure proposed by Taiwan institute of technology, China (as shown in FIG. 3).
The three-layer stacking structure is formed by stacking the red, green and blue cholesterol liquid crystal reflecting layers respectively, so that the defects of complex driving design, high thickness, uneasiness in bending, slow reaction time and the like are caused; the single-layer colorization structure is complicated in process, and cholesterol liquid crystals capable of reflecting red, green and blue are required to be respectively injected into the pixel units, so that the production efficiency is low.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a reflective display and a method for manufacturing the same, wherein a cholesteric liquid crystal layer is combined with a plurality of quantum color layers and light holes to form a color film layer, which respectively displays red, green, blue, and other colors, thereby achieving the purpose of color display, and simplifying the manufacturing process and the voltage driving design.
The technical scheme provided by the invention is as follows:
compared with the prior art, the invention can bring at least one of the following beneficial effects:
1. the cholesterol liquid crystal layer is combined with a plurality of quantum color layers and the light holes to form a color film layer, so that the colors such as red, green, blue and the like are respectively displayed, the purpose of color display is achieved, and the manufacturing process is simplified;
2. the single-layer structure realizes the color display of the reflective display, and the voltage driving design is simple;
3. the arrangement and area ratio of various color layers and light holes can be flexibly adjusted according to requirements, so that the display brightness can be improved, and the color gamut can be enlarged.
Drawings
The present invention will be further described in the following detailed description of preferred embodiments, which is to be read in connection with the accompanying drawings.
FIG. 1 is a schematic diagram of steady state switching of a cholesteric liquid crystal;
FIG. 2 is a schematic diagram of a color cholesteric liquid crystal display with a three-layer stacked structure;
FIG. 3 is a schematic view of a cholesteric liquid crystal display with a single-layer colorization structure;
FIG. 4 is a diagram illustrating a bright mode of the reflective display according to the present invention;
FIG. 5 is a schematic diagram of a dark mode of the reflective display according to the present invention;
FIG. 6 is a schematic diagram of a design of a red and green quantum color layer with a light hole according to the present invention;
FIG. 7 is a schematic view of another design of the red and green quantum color layers with the light holes of the present invention;
FIG. 8 is a schematic view of another design of the red and green quantum color layers with the light holes of the present invention;
FIG. 9 is a schematic view of another design of the red and green quantum color layers with the light hole.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will be made with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the invention, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
For the sake of simplicity, the drawings only schematically show the parts relevant to the present invention, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled. In this document, "one" means not only "only one" but also a case of "more than one".
As shown in fig. 4, the reflective display of the present invention includes a first substrate 01, a second substrate 02, and a cholesteric liquid crystal layer 03 interposed between the first substrate 01 and the second substrate 02. The first substrate 01 is provided with a first conductive layer (not shown) and a light absorption layer 11 at a side close to the cholesteric liquid crystal layer 03, the second substrate 02 is provided with a color film layer 12 and a second conductive layer at a side close to the cholesteric liquid crystal layer, the color film layer 12 comprises a plurality of first quantum color layers 211, a plurality of second quantum color layers 212 and a plurality of light holes 213; the first quantum color layer 211 comprises a first type of quantum dot material, and the second quantum color layer 212 comprises a second type of quantum dot material; ambient light is incident into the reflective display through the light-transmitting hole 213, and the remaining regions of the first quantum color layer 211, the second quantum color layer 212, and the color film layer 12 may have a certain light-transmitting property.
When the cholesterol liquid crystal layer is in a planar state, the first quantum color layer 211 and the second quantum color layer 212 respectively convert light reflected by the cholesterol liquid crystal layer into light with different wavelengths and emit the light, and the light reflected by the cholesterol liquid crystal layer is emitted through the light-transmitting hole 213; when the cholesteric liquid crystal layer is in a focal conic state, light incident into the reflective display is scattered by the cholesteric liquid crystal and absorbed by the light absorption layer 11.
The cholesterol liquid crystal layer comprises one or more cholesterol liquid crystals, an optical rotation agent, a photo initiator and a high molecular monomer, and the reflectivity of the cholesterol liquid crystal layer to light with a specific wavelength is improved by adjusting the screw pitch of the cholesterol liquid crystal.
The reflective display comprises a plurality of pixel units arranged in a matrix and a driving circuit, wherein the driving circuit applies voltage to the first conductive layer and the second conductive layer to control the cholesterol liquid crystal layer in the appointed pixel unit to be switched between a plane state and a focal conic state. After the switching is completed, the cholesteric liquid crystal layer maintains the previous stable state even if the voltage is removed. According to different designs, only one of the first conductive layer and the second conductive layer can be reserved.
As an embodiment, as shown in fig. 4, when the cholesteric liquid crystal in the pixel unit is in a planar state, blue light with a selected wavelength in an ambient light source can be reflected, i.e., the cholesteric liquid crystal layer includes at least one blue cholesteric liquid crystal. Accordingly, the first quantum color layer 211 includes a red quantum dot material, which can convert the reflected blue light into red light, and the red light is emitted through the second substrate 02; the second quantum color layer 212 includes a green quantum dot material, and can convert the reflected blue light into green light, which is emitted through the second substrate 02. The light hole 213 not only allows ambient light to enter the reflective display through the light hole 213, but also allows reflected blue light to exit through the light hole 213. The light holes 213 are blocks formed by transparent films or hollow holes penetrating the color films 12 perpendicular to the display surface. The blue light passes through the red quantum dot material, the green quantum dot material and the light hole 213 to respectively display red, green, blue and other colors, thereby achieving the purpose of color display.
As shown in fig. 5, when the cholesteric liquid crystal in the pixel unit is switched to the focal conic state, all light sources incident into the reflective display are scattered by the cholesteric liquid crystal and absorbed by the light absorption layer 11 to form a dark state.
The plurality of first quantum color layers 211, the plurality of second quantum color layers 212 and the plurality of light holes 213 on the color film layer 12 have various arrangement modes, and the arrangement modes of the first quantum color layers 211, the second quantum color layers 212 and the light holes 213 are simultaneously arranged corresponding to the pixel units of the display according to the requirements.
In the arrangement shown in fig. 6, the first quantum color layer 211, the second quantum color layer 212, and the light-transmitting hole 213 in the color film layer 12 are arranged in order along the horizontal direction.
In the arrangement shown in fig. 7, the first quantum color layer 211, the light-transmitting hole 213, the second quantum color layer 212, and the light-transmitting hole 213 in the color film layer 12 are sequentially arranged in the horizontal direction, so that the light-transmitting amount of the light-transmitting hole 213 can be increased, and the color mixture of the first quantum color layer 211 and the second quantum color layer 212 can be avoided.
In the arrangement shown in fig. 7, the areas of the plurality of quantum color layers can be controlled to be different according to the difference in transmittance, lifetime, and the like of the plurality of quantum color layers.
In the arrangement shown in fig. 8, a plurality of quantum color layers are designed to be circular, diamond-shaped, etc., and are staggered on the color film layer 12, and the light transmission holes 213 are distributed at the gaps between the quantum color layers.
It should be noted that the reflective display of the present invention is not limited to the combination of blue cholesteric liquid crystal with red and green quantum dot materials, but also includes various combinations of cholesteric liquid crystal of a first color with at least one quantum color layer of a second color.
The invention also discloses a manufacturing method of the reflective display, which comprises the following steps:
the first step is as follows: providing a glass substrate or a flexible substrate, forming a black light absorption layer 11 on the substrate, and forming a first conductive layer on the black light absorption layer 11 to obtain a first substrate 01;
the second step is that: providing another glass substrate or flexible substrate, forming a color film layer 12 on the substrate, performing photoresist coating, exposure, development, etching and photoresist stripping on the first film layer, and forming a plurality of first holes, a plurality of second holes and a plurality of light holes 213 on the first film layer; forming a first quantum color layer 211 in the first type of pores and a second quantum color layer 212 in the second type of pores; the first film layer, the first quantum color layer 211, the second quantum color layer 212 and the light hole 213 form a color film layer 12; forming a second conductive layer on the color film layer 12 to obtain a second substrate 02;
the third step: the first substrate 01 and the second substrate 02 are assembled in a box, and a cholesterol liquid crystal prepared with a spin-on agent, a photo initiator or a high molecular monomer is injected between the first substrate 01 and the second substrate 02 to form a cholesterol liquid crystal layer, so as to obtain the reflective display.
The reflective display of the invention combines a plurality of quantum dot materials and the light hole 213 to form the color film layer 12 through the cholesterol liquid crystal layer, and respectively displays red, green, blue and other colors, thereby achieving the purpose of color display, simplifying the manufacturing process and the voltage driving design, and also discloses a manufacturing method of the reflective display.
It should be noted that the above embodiments can be freely combined as necessary. The foregoing is only a preferred embodiment of the present invention, and it should be noted that various modifications and adaptations can be made by those skilled in the art without departing from the principle of the present invention, and should be considered as the scope of the present invention.
Claims (7)
1. A reflective display comprises a first substrate, a second substrate and a cholesterol liquid crystal layer sandwiched between the first substrate and the second substrate, characterized in that:
the first substrate is provided with a first conducting layer and a light absorption layer at one side close to the cholesterol liquid crystal layer;
a color film layer is arranged on one side, close to the cholesterol liquid crystal layer, of the second substrate, and comprises a plurality of first quantum color layers, a plurality of second quantum color layers and a plurality of light holes, and the light holes are formed between the first quantum color layers and the second quantum color layers; ambient light is emitted into the interior of the reflective display through the light hole;
when the cholesterol liquid crystal layer is in a planar state, the first quantum color layer and the second quantum color layer respectively convert light reflected by the cholesterol liquid crystal layer into light with different wavelengths and emit the light, and the light reflected by the cholesterol liquid crystal layer is emitted through the light holes;
when the cholesterol liquid crystal layer is in a focal conic state, the light emitted into the reflective display is scattered by the cholesterol liquid crystal layer and absorbed by the light absorption layer;
the light holes are hollowed holes which penetrate through the color film layer and are perpendicular to the surface of the reflective display.
2. A reflective display according to claim 1, wherein:
the cholesterol liquid crystal layer comprises blue cholesterol liquid crystal, the first quantum color layer comprises red quantum dot material, and the second quantum color layer comprises green quantum dot material.
3. A reflective display according to claim 1, wherein:
and a second conducting layer is arranged on one side of the second substrate close to the cholesterol liquid crystal layer.
4. A reflective display according to claim 3, wherein:
the reflective display includes a plurality of pixel cells and a driving circuit that applies a voltage to the first conductive layer and the second conductive layer such that the cholesteric liquid crystal layer in a given pixel cell is switched between a planar state and a focal conic state.
5. A reflective display according to claim 1, wherein:
the cholesterol liquid crystal layer comprises a light rotating agent or a light initiator.
6. A method of manufacturing a reflective display, comprising the steps of:
the first step is as follows: providing a glass substrate or a flexible substrate, forming a light absorption layer on the substrate, and forming a first conductive layer on the light absorption layer to obtain a first substrate;
the second step is that: providing another glass substrate or a flexible substrate, forming a first film layer on the substrate, etching the first film layer, and forming a plurality of first holes, a plurality of second holes and a plurality of light holes on the first film layer; forming a first quantum color layer in the first type of pores and a second quantum color layer in the second type of pores; the color film layer is composed of a first film layer, a first quantum color layer, a second quantum color layer and a light hole, and the light hole is arranged between the first quantum color layer and the second quantum color layer; forming a second conducting layer on the color film layer to obtain a second substrate;
the third step: and assembling the first substrate and the second substrate into a box, and injecting cholesterol liquid crystal between the first substrate and the second substrate to form a cholesterol liquid crystal layer to obtain the reflective display.
7. A method of manufacturing a reflective display according to claim 6, wherein:
the cholesteric liquid crystal is blue cholesteric liquid crystal, the first quantum color layer comprises a red quantum dot material, and the second quantum color layer comprises a green quantum dot material.
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| CN111308785A (en) * | 2020-03-27 | 2020-06-19 | 深圳市华星光电半导体显示技术有限公司 | Color conversion display device and manufacturing method thereof |
| TW202138884A (en) * | 2020-04-01 | 2021-10-16 | 虹曜電紙技術股份有限公司 | Cholesteric liquid crystal display device and fabrication method thereof |
| TWI759241B (en) * | 2021-08-12 | 2022-03-21 | 友達光電股份有限公司 | Pixel structure |
| CN114063339B (en) * | 2021-11-18 | 2023-12-26 | 武汉华星光电技术有限公司 | Display panel and mobile terminal |
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| KR100814339B1 (en) * | 2001-11-16 | 2008-03-18 | 엘지.필립스 엘시디 주식회사 | Reflective liquid crystal display device with cholesteric liquid crystal color filter |
| KR20100042128A (en) * | 2008-10-15 | 2010-04-23 | 삼성전자주식회사 | Color display |
| KR101529981B1 (en) * | 2008-11-27 | 2015-06-18 | 삼성디스플레이 주식회사 | Display device and manufacturing method thereof |
| US9581870B2 (en) * | 2009-08-13 | 2017-02-28 | 3M Innovative Properties Company | Conducting film or electrode with improved optical and electrical performance for display and lighting devices and solar cells |
| CN102591054A (en) * | 2011-01-06 | 2012-07-18 | 联胜（中国）科技有限公司 | Liquid crystal display panel |
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| KR102751084B1 (en) * | 2017-02-08 | 2025-01-07 | 삼성디스플레이 주식회사 | Display device and mehthod for manufacturing the same |
| CN107145010A (en) * | 2017-07-04 | 2017-09-08 | 京东方科技集团股份有限公司 | A kind of preparation method of display panel, display device and display panel |
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