CN113760125A - Double-layer bistable liquid crystal writing device and method - Google Patents
Double-layer bistable liquid crystal writing device and method Download PDFInfo
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- CN113760125A CN113760125A CN202110931113.3A CN202110931113A CN113760125A CN 113760125 A CN113760125 A CN 113760125A CN 202110931113 A CN202110931113 A CN 202110931113A CN 113760125 A CN113760125 A CN 113760125A
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 106
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000000758 substrate Substances 0.000 claims abstract description 12
- 239000010410 layer Substances 0.000 claims description 127
- 239000010409 thin film Substances 0.000 claims description 14
- 239000002355 dual-layer Substances 0.000 claims description 5
- 239000003086 colorant Substances 0.000 claims description 3
- 230000005669 field effect Effects 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000005684 electric field Effects 0.000 description 4
- 238000004146 energy storage Methods 0.000 description 3
- 239000004986 Cholesteric liquid crystals (ChLC) Substances 0.000 description 2
- 239000010408 film Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
-
- 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
-
- 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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- 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
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0414—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using force sensing means to determine a position
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
- G06F3/0421—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen
Abstract
The invention belongs to the technical field of liquid crystal writing board structures, and provides a double-layer bistable liquid crystal writing device and method. The double-layer bistable liquid crystal writing device comprises a first PET layer, a first bistable liquid crystal layer, a second PET layer, a third PET layer, a second bistable liquid crystal layer and a TFT substrate layer which are sequentially arranged; a plurality of pixel units are integrated on the TFT substrate layer and are arranged in an array manner; the TFT corresponding to each row of pixel units is connected by at least one first wire and supplies control voltage; the TFT corresponding to each column of pixel units is connected by at least one second conducting wire and supplies input voltage.
Description
Technical Field
The invention belongs to the technical field of liquid crystal writing board structures, and particularly relates to a double-layer bistable liquid crystal writing device and method.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The existing liquid crystal writing structure is generally a single-layer liquid crystal writing board film. In case of a writing error of the existing single-layer liquid crystal writing film, all fonts or patterns presented on the liquid crystal writing board must be erased, so that only a part which a user wants to erase cannot be erased like writing on actual paper.
Disclosure of Invention
In order to solve the technical problems in the background art, the present invention provides a dual-layer bistable liquid crystal writing device and method, which can improve the user experience.
In order to achieve the purpose, the invention adopts the following technical scheme:
a first aspect of the present invention provides a double-layered bistable liquid crystal writing device, which includes a first PET layer, a first bistable liquid crystal layer, a second PET layer, a third PET layer, a second bistable liquid crystal layer, and a TFT substrate layer, which are sequentially disposed;
a plurality of pixel units are integrated on the TFT substrate layer and are arranged in an array manner;
the TFT corresponding to each row of pixel units is connected by at least one first wire and supplies control voltage;
the TFT corresponding to each column of pixel units is connected by at least one second conducting wire and supplies input voltage.
Furthermore, a pixel electrode and a thin film field effect transistor (TFT) connected with the pixel electrode are arranged in each pixel unit.
Further, the thin film transistor TFT is configured to be turned on upon receiving a set control voltage and an input voltage, thereby inputting a set voltage for the corresponding pixel electrode, enabling partial erasing.
Furthermore, a control voltage input end of the thin film transistor TFT is connected with a first wire, an input voltage input end of the thin film transistor TFT is connected with a second wire, and an output end of the thin film transistor TFT is connected with a pixel electrode.
A second aspect of the present invention provides a control method of the double-layer bistable liquid crystal writing device as described above, comprising:
and acquiring the position of the pressure track in real time, and erasing the pressure track on the second bistable liquid crystal layer in real time and enabling a set target area of the second bistable liquid crystal layer to only display a set pattern by controlling the voltage input to the first lead, the second lead and the third PET layer.
Further, the boundary of the setting pattern is a solid line.
Further, the boundary of the setting pattern is a dotted line.
Further, the first and second bistable liquid crystal layers reflect different colors.
Further, the control method of the double-layer bistable liquid crystal writing device further comprises the following steps:
and judging whether the pressure track is filled with the set pattern and does not exceed the boundary of the set pattern, if so, writing is qualified, and otherwise, writing is unqualified.
Further, when the writing is unqualified, the pressure track on the first bistable liquid crystal layer is erased by controlling the voltage input to the first lead, the second lead, the first PET layer and the second PET layer according to the preset requirement.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a double-layer bistable liquid crystal writing device which comprises a first PET layer, a first bistable liquid crystal layer, a second PET layer, a third PET layer, a second bistable liquid crystal layer and a TFT substrate layer which are sequentially arranged.
The invention also can erase the pressure track on the second bistable liquid crystal layer in real time and enable the set target area of the second bistable liquid crystal layer to only display the set pattern by acquiring the position of the pressure track in real time and controlling the voltage input to the first lead, the second lead and the third PET layer, thereby avoiding the influence of the pressure track on the set pattern of the set target area and improving the experience of users.
Advantages of additional aspects 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
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic diagram of a dual-layer bistable liquid crystal writing device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a circuit structure on a substrate layer according to an embodiment of the disclosure;
FIG. 3 is a schematic diagram of a circuit structure on another substrate layer disclosed in the embodiments of the present invention;
FIG. 4 is a schematic diagram of a TFT connection disclosed in an embodiment of the present invention;
FIG. 5(a) is a diagram illustrating a predetermined pattern displayed by the second bistable liquid crystal layer according to the embodiment of the present invention;
FIG. 5(b) shows an embodiment of the present invention filling the set pattern of the second bistable liquid crystal layer but exceeding the boundary of the set pattern;
FIG. 5(c) shows the set pattern of the second bistable liquid crystal layer not filled up but beyond the boundary of the set pattern according to the embodiment of the present invention;
FIG. 5(d) shows a set pattern not filled with the second bistable liquid crystal layer and not exceeding the boundary of the set pattern according to the embodiment of the present invention;
FIG. 5(e) shows the set pattern of the second bistable liquid crystal layer filled up without exceeding the boundary of the set pattern according to the embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. 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 invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. 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.
< double-layer Bistable liquid Crystal writing device >
Referring to fig. 1, the present embodiment provides a double-layered bistable liquid crystal writing device including a first PET layer 2-3, a first bistable liquid crystal layer 2-2, a second PET layer 2-1, a third PET layer 1-3, a second bistable liquid crystal layer 1-2, and a TFT substrate layer 1-1, which are sequentially disposed.
A plurality of pixel units are integrated on the TFT substrate layer and are arranged in an array manner;
the TFT corresponding to each row of pixel units is connected by at least one first wire and supplies control voltage;
the TFT corresponding to each column of pixel units is connected by at least one second conducting wire and supplies input voltage.
In this embodiment, the first bistable liquid crystal layer 2-2 and the second bistable liquid crystal layer 1-2 are both bistable cholesteric liquid crystals capable of writing by pressure. The liquid crystal can realize pressure writing display when receiving pressure; when the set first electric field action is received, the erasing can be realized; when the set second electric field is received, the electric drive display can be realized, and the eye protection function can be realized. The specific values of the first electric field and the second electric field are determined according to the self properties of the bistable cholesteric liquid crystal.
Referring to fig. 3, in a specific implementation, a pixel electrode and a thin film field effect transistor TFT connected to the pixel electrode are provided in each pixel unit.
According to the layout mode of the pixel electrodes, the gates of the TFTs in each row of the pixel electrodes are connected to the same first lead (G1, G2, …); or each row of pixel electrodes are divided into a plurality of groups, and the grid electrodes of the TFTs in the pixel electrodes of each group are all connected to the same first conducting wire.
As shown in fig. 2, two second conducting lines S11, S12 (taking the first column as an example) are respectively arranged along each column of the pixel electrode array, the sources of the TFTs connected to all the pixel electrodes of the column are connected to the two second conducting lines S11, S12 corresponding to the column, and the sources of the two TFTs connected to the single pixel electrode of each column are respectively connected to different second conducting lines; for example, in each switching element (e.g., TFT) group, the source of the first TFT is connected to the second conducting line S11, and the source of the second TFT is connected to the second conducting line S12; the specific connection mode of the TFT and the second conductive line can be designed by those skilled in the art.
The above rows and columns can be interchanged according to actual needs, that is, the gates of the TFTs in the pixel electrodes of each column are connected to the same first conductor; correspondingly, the source electrode of the TFT of each row is connected with the second conducting wire. The present embodiment is described by taking the example of arranging the first conductive lines in each row.
The first conducting wires are arranged in parallel, the second conducting wires are arranged in parallel, and the first conducting wires and the second conducting wires are arranged in a staggered mode.
In this embodiment, the TFT is configured to be turned on upon receiving a set control voltage and an input voltage, thereby inputting a set voltage for the corresponding pixel electrode, enabling partial erasing.
Specifically, for each pixel electrode, the gate electrodes of the TFTs connected in parallel are supplied with an on control voltage through a first wire, and the source electrodes of the TFTs are supplied with an input voltage through a second wire, respectively; reasonably applying the conduction control voltage and the input voltage of each TFT, controlling the conduction of the set TFT and applying the set first voltage, second voltage or third voltage to the pixel electrode; a voltage difference formed between the first voltage and a fourth voltage applied by the conductive layer can enable a region corresponding to the pixel electrode to be in a display state; a voltage difference formed between the second voltage and a fourth voltage applied by the conductive layer can enable a region corresponding to the pixel electrode to be in an erasing state; the voltage difference formed between the third voltage and the fourth voltage applied by the conductive layer can keep the area corresponding to the pixel electrode unchanged.
The control voltage input end of the thin film transistor TFT is connected with a first wire, the input voltage input end of the thin film transistor TFT is connected with a second wire, and the output end of the thin film transistor TFT is connected with a pixel electrode.
In one embodiment, the control terminals of all the TFTs are connected to the same first wire.
In another embodiment, the control terminals of all the TFTs are respectively connected to the corresponding first conductive lines according to a predetermined rule.
In some embodiments, the input terminals of all the TFTs are connected to the same second wire;
in other embodiments, the input terminals of all TFTs are connected to the corresponding second conductive lines according to a predetermined rule.
FIG. 4 is a schematic diagram showing an equivalent circuit for connecting TFTs, wherein the first plate represents a pixel electrode region on the base layer to which the TFTs are connected; the second plate represents the conductive layer. The grid electrode of the TFT is connected with the first conducting wire, the source electrode of the TFT is connected with the second conducting wire, and the drain electrode of the TFT is connected with the corresponding pixel electrode. The grid electrode of the TFT is provided with conduction control voltage through the first conducting wire, and the source electrode of the TFT is provided with input voltage required by display through the second conducting wire, so that the display function of the liquid crystal writing device is realized.
Referring to fig. 4, the drain of the TFT is also connected to one end of a storage capacitor C1, the other end lead of the storage capacitor C1 is connected to the electrode lead of the conductive layer, and the TFT is turned on to charge the storage capacitor C1.
It should be noted that the conventional TFT circuit needs to have C1, and this embodiment may be carried or omitted, and does not consider the effect of parasitic capacitance generated by the circuit itself.
In this embodiment, the energy storage capacitor C1 is used to store energy, and certainly, the capacitor formed between the conductive layer and the substrate layer itself may be used to realize the energy storage capacitor C1, so that the energy storage capacitor C1 may be omitted.
It should be noted that the double-layer bistable liquid crystal writing device of this embodiment may be applied to a light energy writing board, a light energy liquid crystal writing board, a light energy large liquid crystal writing blackboard, a light energy dust-free writing board, a light energy portable blackboard, an electronic drawing board, an LCD electronic writing board, an electronic notepad, a doodle board, a child writing board, a child doodle drawing board, an eraser function sketch board, a liquid crystal electronic drawing board, a color liquid crystal writing board, or other related products that can be known to those skilled in the art.
< method for controlling double-layer bistable liquid crystal writing device >
The control method of the double-layer bistable liquid crystal writing device comprises the following steps:
and acquiring the position of the pressure track in real time, and erasing the pressure track on the second bistable liquid crystal layer in real time and enabling a set target area of the second bistable liquid crystal layer to only display a set pattern by controlling the voltage input to the first lead, the second lead and the third PET layer.
In one or more embodiments, the method of controlling a dual-layer bistable liquid crystal writing device further includes:
and judging whether the pressure track is filled with the set pattern and does not exceed the boundary of the set pattern, if so, writing is qualified, and otherwise, writing is unqualified.
And when the writing is unqualified, erasing the pressure track on the bistable liquid crystal layer on the first layer by controlling the voltage input to the first lead, the second lead, the first PET layer and the second PET layer according to the preset requirement.
It should be noted that the setting pattern may be any artificially set pattern, such as a field grid, a horizontal line grid, a setting area boundary box, or the like.
The boundaries of the setting pattern are solid lines or dotted lines, and those skilled in the art can specifically set the setting according to actual situations, and are not described in detail here.
In another embodiment, the first 2-2 and second 1-2 bistable liquid crystal layers reflect different colors.
For example, the setting pattern displayed in the setting target region of the second bistable liquid crystal layer 1-2 is a pattern preset by those skilled in the art, as shown in fig. 5 (a).
If the pressure trace applied to the first bistable liquid crystal layer 2-2 is completely overlapped with the set pattern on the second bistable liquid crystal layer 1-2, the superimposed color reflected by the first bistable liquid crystal layer 2-2 and the second bistable liquid crystal layer 1-2 is presented.
For example: the color reflected by the first bistable liquid crystal layer 2-2 is red, and the color reflected by the second bistable liquid crystal layer 1-2 is green, when the pressure trace received by the first bistable liquid crystal layer 2-2 is completely overlapped with the set pattern on the second bistable liquid crystal layer 1-2, the overlapped area presents yellow, and the yellow area fills the set pattern of the second bistable liquid crystal layer 1-2 and does not exceed the boundary of the set pattern of the second bistable liquid crystal layer 1-2.
At this time, i.e., indicating that the pressure trace filled the set pattern of the second bistable liquid crystal layer 1-2 and did not exceed the boundary of the set pattern of the second bistable liquid crystal layer 1-2, as shown in fig. 5(e), in this case, writing was passed.
If the pressure trace received by the first bistable liquid crystal layer 2-2 exceeds the boundary of the set pattern on the second bistable liquid crystal layer 1-2, the region beyond the boundary of the set pattern shows the color reflected by the first bistable liquid crystal layer 2-2.
For example: the color reflected by the first bistable liquid crystal layer 2-2 is red, the color reflected by the second bistable liquid crystal layer 1-2 is green, the area beyond the boundary of the set pattern is red, and the part of the pressure trace, which is overlapped with the set pattern on the second bistable liquid crystal layer 1-2, is yellow.
For example, a set pattern filling the second bistable liquid crystal layer 1-2 but beyond the boundaries of the set pattern as shown in fig. 5(b) occurs, and a set pattern not filling the second bistable liquid crystal layer 1-2 but beyond the boundaries of the set pattern as shown in fig. 5(c) occurs.
If the pressure trace experienced by the first bistable liquid crystal layer 2-2 does not completely cover the set pattern on the second bistable liquid crystal layer 1-2, the uncovered area will appear the color reflected by the second bistable liquid crystal layer 1-2.
For example: the color reflected by the first bistable liquid crystal layer 2-2 is red, the color reflected by the second bistable liquid crystal layer 1-2 is green, the uncovered area presents green, and the part of the pressure trace, which is overlapped with the set pattern on the second bistable liquid crystal layer 1-2, presents yellow. If the set pattern of the second bistable liquid crystal layer 1-2 is not filled and the boundary of the set pattern is not exceeded as shown in fig. 5(d), the writing is failed.
When the writing is unqualified, the existing pressure trace on the first bistable liquid crystal layer 2-2 can be erased by controlling the voltage input to the first conducting wire, the second conducting wire, the first PET layer and the second PET layer according to the preset requirement, for example, the pressure trace on the first bistable liquid crystal layer 2-2 is erased by one key, or the pressure trace in the set area is only erased.
In the implementation, when the content to be erased in the display state is the whole content displayed on the first bistable liquid crystal layer 1-2, the controller can be used for controlling the voltages input to the first conducting wire, the second conducting wire, the first PET layer and the second PET layer, so that the whole content displayed on the first bistable liquid crystal layer 1-2 is erased by one key; when the content to be erased in the display state is a part of the content displayed on the first bistable liquid crystal layer 1-2, the controller can be used to control the voltages input to the set regions of the first conducting wire, the second conducting wire, the first PET layer and the second PET layer, so that the part of the content displayed on the first bistable liquid crystal layer 1-2 is partially erased.
In specific implementation, the mode of acquiring the pressure track position in real time can be realized by the infrared positioning devices arranged around the double-layer bistable liquid crystal writing device.
It is understood that other positioning devices or structures may be selected by those skilled in the art to obtain the pressure trace position in real time according to the actual situation.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A double-layer bistable liquid crystal writing device is characterized by comprising a first PET layer, a first bistable liquid crystal layer, a second PET layer, a third PET layer, a second bistable liquid crystal layer and a TFT substrate layer which are sequentially arranged;
a plurality of pixel units are integrated on the TFT substrate layer and are arranged in an array manner;
the TFT corresponding to each row of pixel units is connected by at least one first wire and supplies control voltage;
the TFT corresponding to each column of pixel units is connected by at least one second conducting wire and supplies input voltage.
2. The dual-layer bistable liquid crystal writing device of claim 1, wherein each of said pixel cells is provided with a pixel electrode and a thin film field effect transistor (TFT) connected to said pixel electrode.
3. The bi-layer bistable liquid crystal writing device of claim 2, wherein said thin film transistor TFT is configured to be turned on upon receiving a set control voltage and an input voltage, thereby inputting a set voltage for a corresponding pixel electrode, enabling partial erasing.
4. The bi-layer bistable liquid crystal writing device of claim 2, wherein a control voltage input terminal of said thin film transistor TFT is connected to a first wire, an input voltage input terminal of said thin film transistor TFT is connected to a second wire, and an output terminal of said thin film transistor TFT is connected to a pixel electrode.
5. A method of controlling a bi-layer bistable liquid crystal writing device according to any of claims 1-4, comprising:
and acquiring the position of the pressure track in real time, and erasing the pressure track on the second bistable liquid crystal layer in real time and enabling a set target area of the second bistable liquid crystal layer to only display a set pattern by controlling the voltage input to the first lead, the second lead and the third PET layer.
6. The method of controlling a bi-layer bistable liquid crystal writing device of claim 5, wherein the border of said set pattern is a solid line.
7. The method of controlling a bi-layer bistable liquid crystal writing device of claim 5, wherein the boundary of said set pattern is a dotted line.
8. The method of controlling a dual-layer bistable liquid crystal writing device of claim 5, wherein said first bistable liquid crystal layer and said second bistable liquid crystal layer reflect different colors.
9. The control method of the double-layered bistable liquid crystal writing device of claim 5, further comprising:
and judging whether the pressure track is filled with the set pattern and does not exceed the boundary of the set pattern, if so, writing is qualified, and otherwise, writing is unqualified.
10. The control method of the double-layered bistable liquid crystal writing device according to claim 9, wherein when writing is not qualified, the pressure trace on the first-layer bistable liquid crystal layer is erased by controlling the voltages inputted to the first conductive wire, the second conductive wire, the first PET layer and the second PET layer according to a preset requirement.
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| CN202110931113.3A CN113760125A (en) | 2021-08-13 | 2021-08-13 | Double-layer bistable liquid crystal writing device and method |
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| CN202110931113.3A CN113760125A (en) | 2021-08-13 | 2021-08-13 | Double-layer bistable liquid crystal writing device and method |
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| CN113760125A true CN113760125A (en) | 2021-12-07 |
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| CN202110931113.3A Pending CN113760125A (en) | 2021-08-13 | 2021-08-13 | Double-layer bistable liquid crystal writing device and method |
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| CN (1) | CN113760125A (en) |
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