CN115268146A - Bistable liquid crystal writing device based on high-temperature-resistant hard substrate - Google Patents
Bistable liquid crystal writing device based on high-temperature-resistant hard substrate Download PDFInfo
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- CN115268146A CN115268146A CN202210788810.2A CN202210788810A CN115268146A CN 115268146 A CN115268146 A CN 115268146A CN 202210788810 A CN202210788810 A CN 202210788810A CN 115268146 A CN115268146 A CN 115268146A
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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
- G02F1/1339—Gaskets; Spacers; Sealing of cells
- G02F1/13394—Gaskets; Spacers; Sealing of cells spacers regularly patterned on the cell subtrate, e.g. walls, pillars
-
- 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
- G02F1/133302—Rigid substrates, e.g. inorganic substrates
-
- 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
- G02F1/133345—Insulating layers
-
- 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
- G02F1/13338—Input devices, e.g. touch panels
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Chemical & Material Sciences (AREA)
- Mathematical Physics (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Inorganic Chemistry (AREA)
- Liquid Crystal (AREA)
Abstract
The invention discloses a bistable liquid crystal writing device based on a high-temperature-resistant hard substrate, which comprises: the liquid crystal display panel comprises a light-transmitting flexible film, a first conducting layer, a bistable liquid crystal layer, a second conducting layer and a high-temperature-resistant hard substrate which are sequentially arranged; wherein, an insulating layer is arranged between the second conducting layer and the bistable liquid crystal layer; and the insulating layer is provided with evenly distributed spacing columns. The liquid crystal writing device can avoid the problem of uneven coating of the insulating layer in a double-film structure, save the cost and has wider product adaptability.
Description
Technical Field
The invention relates to the technical field of bistable liquid crystal writing, in particular to a bistable liquid crystal writing device based on a high-temperature-resistant hard substrate.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
The liquid crystal writing products on the market at present mostly use the bistable property of liquid crystal to realize writing display and/or erasing. For example, the cholesteric liquid crystal is used as the bistable liquid crystal of a liquid crystal writing product, the writing pressure trace of a writing pen is recorded by the pressure acting on the liquid crystal writing product, and the corresponding writing content is displayed; the cholesteric liquid crystal structure is changed by applying an electric field, so that a writing pressure track on the liquid crystal writing product disappears to realize erasing.
The prior art discloses a liquid crystal writing device with a double-film structure, which comprises a first substrate, a first conducting layer, a first insulating layer, a liquid crystal layer, a second insulating layer, a second conducting layer and a second substrate which are sequentially arranged from top to bottom; the first substrate and the second substrate are usually made of PET films, and the first conductive layer and the second conductive layer are usually made of ITO films; the insulating layer is insulating glue coated on the conductive films, and a spacing microsphere (spacer) is arranged between the two conductive films to support the two conductive films; however, the structure often has non-uniform erase voltage caused by non-uniform distribution of spacer particles, non-uniform coating of insulating glue, or drooping of liquid crystal, etc., which seriously affects the erase effect (for example, the erase is not clean or the portion which should be remained originally is erased); in addition, the insulation paste is affected by factors such as ultraviolet rays and the like, so that the insulation paste is decomposed to generate bubbles, the product quality is affected, the qualified product rate is low, the failure rate is high, and the manufacturing cost and the maintenance cost are improved.
The liquid crystal writing device based on the TFT substrate disclosed by the prior art structurally comprises a conducting layer, a liquid crystal layer and a TFT substrate layer which are sequentially arranged from top to bottom; however, the method is based on semiconductor process production, integrates a large number of semiconductor devices, and has complex process and high manufacturing cost, so that the product cost is high.
Disclosure of Invention
In order to solve the problems, the invention provides a bistable liquid crystal writing device based on a high-temperature-resistant hard substrate, which can uniformly coat a PI insulating layer on a conducting layer of the high-temperature-resistant hard substrate, further uses PS columns to replace spacing microspheres, is fixed in position, uniform in distribution and good in height consistency of the PS columns, can fully ensure good insulation between the two conducting layers, and saves cost.
In some embodiments, the following technical scheme is adopted:
because the insulating glue applied in the prior art has the condition of uneven coating, even though the PI insulating layer can ensure the uniform coating of the insulating layer, the common PET film cannot resist high temperature, so that the PI insulating layer cannot be applied to the existing bistable liquid crystal writing device.
Accordingly, the present invention provides a bistable liquid crystal writing device based on a high temperature resistant rigid substrate comprising: the liquid crystal display panel comprises a light-transmitting flexible film, a first conducting layer, a bistable liquid crystal layer, a second conducting layer and a high-temperature-resistant hard substrate which are sequentially arranged; wherein, an insulating layer is arranged between the second conducting layer and the bistable liquid crystal layer; and the insulating layer is provided with evenly distributed spacing columns.
In the present invention, the high temperature resistant hard substrate refers to a hard substrate capable of withstanding a set temperature, which is at least higher than the temperature required for spraying the PI insulating layer, for example, at least higher than 260 ℃.
The bottom layer PET film is changed into the high-temperature-resistant hard substrate, such as a glass substrate, and the glass substrate can at least resist the high temperature required by the spraying of the PI insulating layer, so that the PI insulating layer can be arranged on the hard substrate, and the uniform coating of the insulating layer is ensured.
Simultaneously, evenly set up the spacer column on the PI insulating layer, for example: can pass through the mode of illumination printing, evenly grow PS (photo spacer) post, can guarantee to keep even distance between upper and lower conducting layer.
In the bistable liquid crystal writing device based on the high-temperature-resistant hard substrate, in order to realize erasing or local erasing, the first conducting layer and the second conducting layer can be not divided, only one of the conducting layers can be divided into two or more mutually insulated conducting areas, and the two conducting layers can be divided into two or more mutually insulated conducting areas.
Or at least one etching line for insulation is etched on the first conductive layer and/or the second conductive layer, and the conductive layer is divided into two or more conductive regions which are insulated from each other through the etching line.
The conductive regions may be strip-shaped conductive regions, the strip-shaped conductive regions on the same conductive layer are parallel to each other, and the conductive regions on the upper conductive layer and the lower conductive layer are spatially staggered or perpendicular to each other.
In other embodiments, the following technical solutions are adopted:
a writing board comprises the bistable liquid crystal writing device based on the high-temperature-resistant hard substrate.
A blackboard comprises the bistable liquid crystal writing device based on the high-temperature-resistant hard substrate.
Compared with the prior art, the invention has the beneficial effects that:
(1) The liquid crystal writing device adopts a hard substrate, such as a glass substrate, is high-temperature resistant, and can be subjected to high-temperature thermosetting after a conductive film layer where the glass substrate is coated with a PI (polyimide) insulating layer; compared with the insulating glue, the PI insulating layer has the advantages that the thickness is very uniform, the good insulating effect between the two conducting films can be guaranteed, short circuit is avoided, the erasing/displaying performance of the liquid crystal writing board product is stable, the yield is high, and the production cost is greatly reduced.
(2) The liquid crystal writing device can uniformly grow the PS columns on the PI insulating layer in a light printing mode, compared with the mode that the spacing microspheres are not uniformly distributed and are easy to gather, the PS columns can be uniformly distributed and have consistent height, and the process is easy to realize; the PS columns can keep uniform distance between the upper conductive layer and the lower conductive layer, so that erasing/display voltage is uniform and consistent, and the reliability of a product is improved.
(3) Compared with the existing liquid crystal writing device with a spacer and a double-film structure, the liquid crystal writing device has the defects of uneven liquid crystal layer, poor quality stability of finished products, high repair rate and the like.
Additional features and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
FIG. 1 is a schematic structural diagram of a bistable liquid crystal writing device based on a high temperature resistant rigid substrate according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the division of the first conductive layer and the second conductive layer;
the liquid crystal display panel comprises a light-transmitting flexible film 1, a first conducting layer 2, a high-temperature-resistant hard substrate 3, a second conducting layer 4, an insulating layer 5, a spacing column 6 and a bistable liquid crystal layer 7.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Example one
Based on the technical problems stated in the background art, although some hard insulating layers can ensure the uniform thickness of the insulating layers, and the hard insulating layers can be provided with spacing columns instead of spacing microspheres, so as to solve various technical defects caused by the arrangement of the spacing microspheres; however, providing a hard insulating layer requires high temperatures, in some embodiments above 260 ℃; the existing PET film is not high temperature resistant, and a hard insulating layer cannot be arranged on the existing PET film.
Based on the above, in one or more embodiments, a bistable liquid crystal writing device based on a high temperature resistant hard substrate is disclosed, and referring to fig. 1, the bistable liquid crystal writing device specifically comprises: the liquid crystal display panel comprises a light-transmitting flexible film 1, a first conducting layer 2, a bistable liquid crystal layer 7, a second conducting layer 4 and a high-temperature-resistant hard substrate 3 which are sequentially arranged from top to bottom; wherein, between the second conducting layer 4 and the bistable liquid crystal layer 7, an insulating layer 5 is arranged; evenly distributed spacing columns 6 are arranged on the insulating layer.
The transparent flexible film is usually a PET film, the high-temperature-resistant hard substrate is usually a glass substrate, and the high-temperature-resistant hard substrate in this embodiment refers to a hard substrate that can adapt to the temperature of the spraying process (for example, at least 260 ℃). Of course, those skilled in the art can select other light-transmitting flexible films and high-temperature-resistant rigid substrates according to actual needs.
In this embodiment, a PI (polyimide) insulating layer is coated on the surface of the second conductive layer opposite to the bistable liquid crystal layer; because the PI (polyimide) insulating layer needs high-temperature fixation after coating, and a common PET substrate cannot adapt to high temperature, the glass substrate is adopted in the embodiment, the second conducting layer is arranged on the glass substrate, and the glass substrate is high-temperature resistant, so that the effective coating of the PI (polyimide) insulating layer can be ensured; and only an insulating layer is needed to be arranged on the glass substrate, and the insulating layer is not needed to be arranged on the upper film, so that the structure is simplified, and the cost is saved.
In view of the situation that the spacing microspheres are unevenly distributed and are easy to gather, the PI (polyimide) insulating layer of the embodiment is a hard insulating layer, and PS pillars can be arranged on the hard insulating layer; therefore, in this embodiment, a PS column is disposed between the insulating layer on the second conductive layer and the first conductive layer; because the PS columns are printed by illumination, the uniform distribution is easy to realize, and the columns are fixed without aggregation; the PS pillars can maintain uniform height between the upper and lower conductive layers and improve the relative stability of the two conductive layers.
In this embodiment, the PS columns are uniformly arranged in an array; the arrangement density of the spacing columns can be 10-1000/mm2. As a preferred embodiment, the arrangement density of the spacing columns is 100-500/mm2。
The bistable liquid crystal writing device of the embodiment can record the writing pressure track of the writing pen through the pressure acting on the bistable liquid crystal writing device, and further display the corresponding writing content; the bistable liquid crystal structure can be changed by applying set voltages to the upper conductive layer and the lower conductive layer respectively, so that the writing pressure trace disappears to realize erasing.
In some embodiments, the first conductive layer and the second conductive layer are both made of ITO (indium tin oxide) films, and both conductive layers may not be divided, and at this time, a set voltage is applied to each of the two conductive layers, so that an electric field formed between the two conductive layers reaches an erasing electric field of the liquid crystal, thereby implementing one-key erasing of the written content on the whole liquid crystal writing device.
In other embodiments, one of the first conductive layer or the second conductive layer is divided into two or more conductive regions, and the conductive regions may be stripe regions or conductive regions with other shapes.
Of course, a line etching manner may also be selected, at least one etching line for insulation is etched on the first conductive layer or the second conductive layer, and the conductive layer is divided into two or more conductive regions insulated from each other by the etching line.
As an example, the first conductive layer is divided into a first conductive region, a second conductive region, and a third conductive region in a stripe shape; different voltages may be applied to the three conductive regions on the first conductive layer, respectively.
According to the requirement, the set voltage is respectively applied to the three conductive areas of the first conductive layer, the set voltage is applied to the second conductive layer, and the electric field formed by the overlapped part of each conductive area in the first conductive layer and the second conductive layer is controlled, so that the written contents on the first conductive area, the second conductive area and the third conductive area on the first conductive layer can be locally erased.
In other embodiments, the first conductive layer and the second conductive layer are divided into two or more conductive regions, respectively; as a preferred embodiment, referring to fig. 2, the first conductive layer is divided into a plurality of parallel strip-shaped conductive regions in the first direction, the second conductive layer is divided into a plurality of parallel strip-shaped conductive regions in the first direction, the first direction and the second direction are perpendicular, and the conductive regions are equally spaced; a portion where the conductive region on the first conductive layer and the conductive region on the second conductive layer overlap with each other may form a local erasing region.
Of course, at least one etching line for insulation may be etched on the first conductive layer and the second conductive layer, respectively, and the first conductive layer and the second conductive layer may be divided into two or more conductive regions insulated from each other by the etching line.
Dividing the writing device into a mesh structure by dividing the conductive layer, wherein each mesh is an independent erasing area; the segmentation mode is convenient for industrialized batch processing, meanwhile, the segmentation area can be more miniaturized according to actual needs, and more accurate local erasing can be realized by electrifying different conductive areas.
Example two
In one or more embodiments, specific applications of the liquid crystal writing device of example one are disclosed, such as: can be applied to writing boards, blackboards or drawing boards, or other related products which can be known to those skilled in the art.
These products all adopt the structure of the bistable liquid crystal writing device based on the high-temperature resistant hard substrate described in the first embodiment.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive changes in the technical solutions of the present invention.
Claims (13)
1. A bistable liquid crystal writing device based on a high temperature resistant rigid substrate comprising: the liquid crystal display panel comprises a light-transmitting flexible film, a first conducting layer, a bistable liquid crystal layer, a second conducting layer and a high-temperature-resistant hard substrate which are sequentially arranged; wherein, an insulating layer is arranged between the second conducting layer and the bistable liquid crystal layer; and the insulating layer is provided with evenly distributed spacing columns.
2. A bistable liquid crystal writing device based on high temperature resistant rigid substrates as in claim 1 wherein said dielectric layer is a PI dielectric layer.
3. A bistable liquid crystal writing device based on high temperature resistant rigid substrates as in claim 1 wherein said spacer posts are PS posts.
4. A bistable liquid crystal writing device based on high temperature resistant rigid substrates as in claim 1 wherein said spacer posts are arranged in an array pattern.
5. The bistable liquid crystal writing instrument of claim 1, wherein said spacing posts are arranged at a density of 10-1000/mm2。
6. The bistable liquid crystal writing instrument of claim 1, wherein said spacer pillars are arranged at a density of 100-500/mm2。
7. A bistable liquid crystal writing device based on high temperature resistant rigid substrates as in claim 1 wherein said light transmissive flexible film is a PET film.
8. A bistable liquid crystal writing device based on high temperature resistant rigid substrates as claimed in claim 1 wherein said high temperature resistant rigid substrates are glass substrates.
9. A bistable liquid crystal writing device based on high temperature resistant rigid substrates according to claim 1 wherein said first conductive layer and said second conductive layer are not segmented.
10. A bistable liquid crystal writing device based on high temperature resistant rigid substrates according to claim 1 wherein said first conductive layer or said second conductive layer is divided into two or more strip-like conductive areas insulated from each other;
or at least one etching line for insulation is etched on the first conducting layer or the second conducting layer, and the conducting layer is divided into two or more strip-shaped conducting regions which are insulated from each other through the etching line.
11. A bistable liquid crystal writing device based on high temperature resistant rigid substrates according to claim 1 wherein said first conductive layer and said second conductive layer are each divided into two or more strip-like conductive areas insulated from each other; or at least one etching line for insulation is respectively etched on the first conducting layer and the second conducting layer, and the first conducting layer and the second conducting layer are respectively divided into two or more than two strip-shaped conducting areas which are insulated with each other through the etching line;
the strip-shaped conductive areas on the same conductive layer are parallel to each other, and the strip-shaped conductive areas on different conductive layers are staggered or vertical to each other in space.
12. A writing board comprising a bistable liquid crystal writing device based on high temperature resistant rigid substrates according to any of claims 1-11.
13. Blackboard comprising a bistable liquid crystal writing device based on high temperature resistant rigid substrates according to any one of claims 1 to 11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210788810.2A CN115268146A (en) | 2022-07-06 | 2022-07-06 | Bistable liquid crystal writing device based on high-temperature-resistant hard substrate |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210788810.2A CN115268146A (en) | 2022-07-06 | 2022-07-06 | Bistable liquid crystal writing device based on high-temperature-resistant hard substrate |
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| CN109932834A (en) * | 2017-12-15 | 2019-06-25 | 江苏集萃智能液晶科技有限公司 | A kind of selective erase liquid crystal handwriting board device and forming method thereof |
| US20190353949A1 (en) * | 2018-05-15 | 2019-11-21 | Triple Power Limited | Electronic writing board |
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| CN114442350A (en) * | 2022-02-18 | 2022-05-06 | 京东方科技集团股份有限公司 | Liquid crystal writing device and driving method thereof |
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