CN112711151A - Bistable liquid crystal writing device with electric drive display and pressure display and method - Google Patents

Bistable liquid crystal writing device with electric drive display and pressure display and method Download PDF

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Publication number
CN112711151A
CN112711151A CN202110196953.XA CN202110196953A CN112711151A CN 112711151 A CN112711151 A CN 112711151A CN 202110196953 A CN202110196953 A CN 202110196953A CN 112711151 A CN112711151 A CN 112711151A
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China
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display
liquid crystal
writing device
voltage
content
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CN202110196953.XA
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CN112711151B (en
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李清波
杨猛训
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Shandong Lanbeisite Educational Equipment Group Co ltd
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Shandong Lanbeisite Educational Equipment Group Co ltd
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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
    • G02F1/13338—Input devices, e.g. touch panels
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—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
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/136227—Through-hole connection of the pixel electrode to the active element through an insulation layer
    • 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
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/1368—Active matrix addressed cells in which the switching element is a three-electrode device
    • 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
    • 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
    • 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
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09B—EDUCATIONAL OR DEMONSTRATION APPLIANCES; APPLIANCES FOR TEACHING, OR COMMUNICATING WITH, THE BLIND, DEAF OR MUTE; MODELS; PLANETARIA; GLOBES; MAPS; DIAGRAMS
    • G09B5/00—Electrically-operated educational appliances
    • G09B5/02—Electrically-operated educational appliances with visual presentation of the material to be studied, e.g. using film strip

Abstract

The invention discloses a bistable liquid crystal writing device with electric drive display and pressure display and a method thereof, wherein the bistable liquid crystal writing device comprises: the conductive layer, the bistable liquid crystal layer and the substrate layer are arranged in sequence; integrated on the base layer are: the pixel units are arranged in an array shape, and each pixel unit is internally provided with a pixel electrode and a switching tube connected with the pixel electrode; and the control unit is configured to adopt a row-by-row/column driving mode, sequentially control the conduction and input voltage of the switch tube set in each row/column based on the display position in each row/column, and input the set voltage for the corresponding pixel electrode, so that the pixel electrode and the conductive layer form a set electric field at the position where the pixel electrode and the conductive layer are overlapped in space, and finally display the content to be displayed is realized. The liquid crystal writing device can display the set content, and can present some complex contents on the writing device, thereby saving a large amount of writing time.

Description

Bistable liquid crystal writing device with electric drive display and pressure display and method
Technical Field
The invention relates to the technical field of bistable liquid crystal writing boards, in particular to a bistable liquid crystal writing device with electric drive display and pressure display and a method thereof.
Background
Currently, in the field of liquid crystal writing display, there are three conventional technologies:
the first is a touch display screen (LCD or LED or OLED, etc.), which can realize writing/displaying function only when being powered on, and can not write/display when being powered off; the display depends on the backlight or the self-luminous device arranged in the device, and the visual fatigue is easily caused by long-time use; the writing needs to rely on an electromagnetic pen or a capacitive pen or a finger of a capacitive screen, and the writing pressure of the electromagnetic pen or the capacitive pen or the contact area between the finger and the screen is detected to generate an electric signal to drive the change of the display state of liquid crystal molecules so as to realize the simulated writing; handwriting is not written by pressure, and the real writing feeling and writing effect cannot be restored.
The second one is electronic paper/electronic ink, the interior of which is polar material, and the writing display is realized by reflecting external light source, and the writing can be still maintained after power off; however, writing can be realized only in a power-on state, and the writing of the pen is not realized by pressure, so that the real writing feeling and writing effect cannot be restored; meanwhile, writing needs to be realized by means of an electromagnetic pen or a capacitive pen or a finger of a capacitive screen, and an electric signal is generated by means of detection of writing pressure of the electromagnetic pen or the capacitive pen or detection of contact area of the finger and the screen to drive the change of the display state of the polar material, so that simulated writing is realized; the writing is not performed by pressure, and the real writing feeling and writing effect cannot be restored.
The third is a bistable liquid crystal pressure writing device, which comprises a first PET conductive layer, a liquid crystal layer and a second PET conductive layer which are arranged in sequence; the working principle is that the bistable characteristic of liquid crystal is utilized to realize pressure writing display; for example, a cholesteric liquid crystal is used as a liquid crystal layer, and a writing pressure trace is recorded by changing the liquid crystal state at a pressed position by pressure applied to a writing area, thereby displaying corresponding writing contents. However, the liquid crystal writing device can only display the written content by pressure writing, but cannot realize voltage driving display, and for a user, the liquid crystal writing device has some complicated formulas or views, and the writing display by pressure is very inconvenient, which is not beneficial to improving the writing efficiency and quality.
Disclosure of Invention
In order to solve the above problems, the present invention provides a bistable liquid crystal writing device and method having an electrically driven display and a pressure display, which can implement a pressure writing display, fully restore a real writing feeling and writing trajectory, and simultaneously implement an electrically driven display.
In order to achieve the above purpose, in some embodiments, the following technical solutions are adopted:
a bistable liquid crystal writing device having an electrically driven display and a pressure display, comprising: the conductive layer, the bistable liquid crystal layer and the substrate layer are arranged in sequence; the base layer includes:
the pixel units are arranged in an array shape, and each pixel unit is internally provided with a pixel electrode and a switching tube connected with the pixel electrode;
the control unit is configured to adopt a line-by-line driving mode, and based on the display position in each line, the control unit inputs set voltage for corresponding pixel electrodes by controlling the conducting state and the input voltage of the switch tube set in each line, so that the pixel electrodes and the conductive layer form set electric fields at the position where the pixel electrodes and the conductive layer are overlapped in space, and finally display of the content to be displayed is realized;
the rows may be replaced with columns.
The display method based on the liquid crystal writing device comprises the following steps:
receiving a display instruction of the set content and acquiring a display position;
and a line-by-line driving display mode is adopted, based on the display position of each line, the set voltage is input for the corresponding pixel electrode by sequentially controlling the conduction state and the input voltage of the switch tube set in each line, so that the pixel electrodes and the conductive layer form a set electric field at the position where the pixel electrodes and the conductive layer are overlapped in space, and finally the display of the content to be displayed is realized.
In other embodiments, the following technical solutions are adopted:
a bistable liquid crystal writing device having an electrically driven display and a pressure display, comprising: the conductive layer, the bistable liquid crystal layer and the substrate layer are arranged in sequence; the base layer includes:
the pixel units are arranged in an array shape, and each pixel unit is internally provided with a pixel electrode and a switching tube connected with the pixel electrode;
the control unit is configured to control and set the conducting state and the input voltage of the switch tubes, and the electric fields formed by the switch tubes and the conducting layers at the spatial overlapping positions firstly enable the liquid crystal writing device to present a display state in a first area formed by a plurality of set lines; then in the first area, sequentially controlling the conducting state and the input voltage of a set switch tube in each row in a row-by-row driving erasing mode, and enabling a sub-area covered by the pixel electrode to be in an erasing state by an electric field formed by the pixel electrode and the conducting layer which are connected by the switch tubes at the spatial overlapping position; and after the driving of the first area is finished, driving the next area until the display of the set content is finished.
The display method based on the liquid crystal writing device comprises the following steps:
receiving a display instruction of the set content and acquiring a display position;
controlling and setting the conducting state and the input voltage of the switch tubes, wherein the switch tubes and the conducting layers form an electric field at a spatial overlapping position, so that the liquid crystal writing device presents a display state in a first area formed by a plurality of set lines;
in the first area, the conducting state and the input voltage of a set switch tube in each row are sequentially controlled in a row-by-row driving erasing mode, and an electric field is formed at the space overlapping position of a pixel electrode and a conducting layer which are connected with the switch tubes, so that a sub-area covered by the pixel electrode is in an erasing state;
and after the driving of the first area is finished, driving the next area until the display of the set content is finished.
In other embodiments, the following technical solutions are adopted:
an electronic schoolbag comprising: the liquid crystal writing device having a display function; the liquid crystal writing device is internally provided with:
the display control module is configured to select display content and display the display content at a set position of the liquid crystal writing device;
the writing control module is configured to be used for realizing writing at a set position on the liquid crystal writing device;
the erasing control module is configured to erase the content of the set position on the liquid crystal writing device;
the data transmission module is configured to be used for realizing data transmission between the liquid crystal writing device and other terminal equipment;
and the data storage module is configured to be used for realizing the storage of the set writing or display content.
In other embodiments, the following technical solutions are adopted:
a liquid crystal large panel comprising: the liquid crystal writing device having a display function; the liquid crystal writing device is internally provided with:
the display control module is configured to select display content and display the display content at a set position of the liquid crystal writing device;
the writing control module is configured to be used for realizing writing at a set position on the liquid crystal writing device;
the erasing control module is configured to erase the content of the set position on the liquid crystal writing device;
the data transmission module is configured to be used for realizing data transmission between the liquid crystal writing device and other terminal equipment;
and the data storage module is configured to be used for realizing the storage of the set writing or display content.
In other embodiments, the following technical solutions are adopted:
a smart classroom, comprising: the system comprises an electronic schoolbag, a liquid crystal large screen and a teacher terminal; the electronic schoolbag, the liquid crystal large screen and the teacher terminal are communicated with each other; the display or writing content on the electronic schoolbag can be synchronously displayed on the teacher terminal.
Compared with the prior art, the invention has the beneficial effects that:
(1) the array pixel units are integrated on the substrate layer of the bottom layer by adopting a mature semiconductor process, the pixel points can be reduced to be within 0.1mm x 0.1mm, the process can ensure that the line breakage condition caused by continuous writing can not occur under the condition of the process of extremely small pixel points, the process flow and the control complexity are reduced, and the control precision is improved.
(2) The liquid crystal writing device does not need to divide the top conducting layer, controls each pixel unit on the basal layer independently, and only needs to apply voltage to the pixel unit covering the position to be displayed line by line to display the set content; therefore, when the teacher teaches, the teacher can directly display some contents such as formulas or diagrams on the liquid crystal writing device (such as a liquid crystal blackboard), and does not need to write by himself, so that a large amount of writing time is saved, and meanwhile, some complex contents can be presented, and a better teaching purpose is achieved.
(3) The liquid crystal writing device realizes writing through pressure, has no time delay in writing, can restore the writing feeling, fully embodies the writing force and the writing track, and has more real writing effect.
(4) The liquid crystal writing device has mature technology, simple control process, no need of secondary development and low cost, realizes display by reflecting an external natural light source, does not need a backlight plate or a self-luminous element, saves electricity consumption, has no electromagnetic radiation and protects eyes in the using process.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic structural diagram of a liquid crystal writing device with a display function disclosed in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a circuit structure integrated on a substrate layer according to an embodiment of the disclosure;
FIGS. 3(a) - (b) are equivalent circuit diagrams of the switch tube connection in the embodiment of the present invention, respectively;
FIGS. 4(a) - (b) are schematic diagrams of voltage application of each pixel unit on the substrate layer and voltage difference between the conductive layer and the substrate layer at the initial time in the embodiment of the present invention;
FIGS. 5(a) - (b) are schematic diagrams of voltage application of each pixel unit on the base layer and the voltage difference between the conductive layer and the base layer in the first half period of voltage application in the embodiment of the present invention;
fig. 6(a) - (b) are schematic diagrams of voltage application of each pixel unit on the base layer and voltage difference between the conductive layer and the base layer in the second half period of voltage application in the embodiment of the present invention.
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
According to an embodiment of the present invention, an embodiment of a liquid crystal writing device with a display function is disclosed, and with reference to fig. 1, the liquid crystal writing device includes: the conductive layer, the bistable liquid crystal layer and the substrate layer are arranged from top to bottom in sequence. The conducting layer is not divided, a plurality of pixel units are integrated on the substrate layer, the pixel units are arranged in an array mode, and a pixel electrode and a switching tube connected with the pixel electrode are arranged in each pixel unit; the switch tube is conducted to provide voltage for the pixel electrode connected with the switch tube.
In this embodiment, the bistable liquid crystal layer is a bistable cholesteric liquid crystal capable of writing by pressure. When the liquid crystal receives pressure, writing display can be realized by changing the state of liquid crystal molecules; when the set first electric field action is received, the erasing can be realized; when the set second electric field action is received, the electric drive display can be realized. The specific values of the first electric field and the second electric field are determined according to the property of the bistable cholesteric liquid crystal and the thickness of the liquid crystal.
The substrate layer is integrated with:
and the control unit is configured to adopt a row-by-row/column driving mode, sequentially control the conducting state and the input voltage of the switching tube set in each row/column based on the display position in each row/column, and input the set voltage for the corresponding pixel electrode, so that the pixel electrode and the conductive layer form a set electric field at the position where the pixel electrode and the conductive layer are overlapped in space, and finally display the content to be displayed is realized.
Several first wires supplied with the grid or base voltage of the switch tube;
and several second wires for supplying the voltage to the source or collector of the switch tube.
And the switching control of each switching tube is realized by adopting a row-by-row/column driving mode.
Referring to fig. 2, the first conductive line is shared by the pixel units of the same row, and the second conductive line is shared by the pixel units of the same column. Those skilled in the art will appreciate that the rows and columns herein are interchangeable.
In this embodiment, a plurality of first conductive lines and a plurality of second conductive lines are respectively integrated corresponding to each column and each row of the pixel units; the arrangement directions of the first conducting wire and the second conducting wire are mutually vertical; the switch tube in each pixel unit is respectively connected with the first conducting wire and the second conducting wire adjacent to the switch tube.
3(a) - (b) show equivalent circuit diagrams of the connection of the switching tube, wherein the first polar plate represents the pixel electrode area connected with the switching tube on the substrate layer; the second plate represents the conductive layer.
The grid electrode or the base electrode of the switch tube is connected with the first conducting wire, the source electrode or the collector electrode of the switch tube is connected with the second conducting wire, and the drain electrode or the emitter electrode of the switch tube is connected with the corresponding pixel electrode. The first conducting wire provides conducting control voltage for the grid electrode or the base electrode of the switch tube, and the second conducting wire provides input voltage required by display for the source electrode or the collector electrode of the switch tube, so that the display function of the liquid crystal writing device is realized.
Referring to fig. 3(a), the drain or collector of the switch tube is also connected to one end of the energy storage capacitor C1, the lead wire at the other end of the energy storage capacitor C1 is connected to the electrode lead wire of the conductive layer, and the switch tube is turned on to charge the energy storage capacitor C1. (the conventional switch tube circuit needs to have C1, and the solution of the embodiment can be carried or omitted, and the effect of the parasitic capacitance generated by the circuit itself is not considered).
In this embodiment, the energy storage capacitor C1 is used to store energy and prevent abrupt voltage change between the conductive layer and the pixel electrode; certainly, the function of the energy storage capacitor C1 can also be realized by using the capacitance formed between the conductive layer and the substrate layer, and at this time, the energy storage capacitor C1 can be omitted; refer to fig. 3 (b).
In the following embodiments, the following embodiments are described by taking the storage capacitor C1 as an example, and it should be understood by those skilled in the art that this is not a limitation to the scope of the present disclosure, and in other embodiments, the storage capacitor C1 may not be provided, and the distributed capacitance formed between the conductive layer and the substrate layer may be used to achieve the purpose of energy storage.
The switch tube applies voltage V to the grid or the baseGoffWhen the switch tube is cut off, the minimum current is passed, and a voltage V is applied to the grid electrode or the base electrodeonWhen the current is zero, the switch tube is close to the maximum conduction current.
In this embodiment, different circuit structures may be integrated on the base layer by using a semiconductor process. Such as: in some embodiments, the substrate layer further has integrated thereon:
a switching tube gate or base driving unit (i.e. a switching tube control end driving unit) for providing a required on or off control voltage for the first conducting wire;
and the source electrode or collector electrode driving unit (namely the input end driving unit of the switch tube) of the switch tube is used for providing required input voltage for the second conducting wire.
In some embodiments, electrode lines are respectively led out from the base layer and the conductive layer; is used for connecting a voltage driving circuit which can provide required voltage.
In other embodiments, the conductive particles are added into the frame glue, and the electrodes of the whole conductive layer are connected to the FPC golden fingers of the substrate layer, so that the electrode extraction of the whole module is extracted from the substrate layer, and the method is simpler and more stable than the original method of respectively extracting the electrodes from the conductive layer and the substrate layer.
The liquid crystal writing device of the embodiment of the invention can 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, a l cd electronic writing board, an electronic note book, a doodle board, a children writing board, a children doodle drawing board, an eraser function sketch board, a liquid crystal electronic drawing board or a color liquid crystal writing board or other related products which can be known by a person skilled in the art.
Example two
According to the embodiment of the invention, an embodiment of a display method of a liquid crystal writing device is disclosed, and based on the structure of the liquid crystal writing device with the practical function disclosed in the first embodiment, the method is specifically realized by the following steps:
receiving a display instruction of the set content and acquiring a display position;
and adopting a row-by-row/column driving display mode, sequentially controlling the conduction of the switching tube and the input voltage set in each row/column based on the display position in each row/column, and inputting the set voltage for the corresponding pixel electrode so as to form a set electric field at the position where the pixel electrode and the conductive layer are overlapped in space, thereby finally realizing the display of the content to be displayed.
It is to be understood that, in fig. 2, the control voltages applied to the pixel units in different rows to be turned on or off may be the same, or different or similar. Similarly, the input voltages applied to the pixel units of different columns for displaying or erasing may be the same, or different or similar.
The specific voltage driving method in this embodiment is as follows:
receiving a display instruction of a control terminal for setting content, and acquiring a display position of the content;
controlling all the switch tubes in the set area of the substrate layer to be conducted, applying a second voltage to all the pixel units, and applying a second voltage to the conductive layer;
keeping the conductive layer applying a second voltage, keeping the switching tubes of the pixel units in the row/column needing display driving switched on, and applying a first voltage to the input ends of the switching tubes set in the pixel units; the other switch tubes are not conducted or the input end applies a second voltage;
the electric field formed by the first voltage and the second voltage at the position where the pixel unit and the conducting layer are overlapped in space can realize the display of the position to be displayed in the row/column.
Referring to fig. 3, a voltage control method for realizing the display function is as follows:
(1) and applying a first voltage to each pixel unit of the base layer and the conductive layer respectively, wherein the voltage difference between the conductive layer and each pixel unit of the base layer is zero.
In particular, each pixel unit on the substrate layer is provided with a first conductive lineThe grid electrode or the base electrode of the switching tube provides a turn-on control voltage VonProviding a first voltage for a source electrode or a collector electrode of a switching tube of each pixel unit on the substrate layer through a second conducting wire; in this way, the switch tube of each pixel unit is turned on, so that the voltage applied to each pixel electrode is the first voltage. The voltage applied to the conductive layer is also the first voltage, so that the electric field of each pixel unit of the whole substrate layer and the corresponding area of the conductive layer are all zero, and no influence is generated on the handwriting at this time.
(2) In the first half period of voltage application, aiming at a certain row of pixel units, applying a second voltage to the pixel units covering the display position, keeping the rest of the pixel units at the first voltage, keeping the pixel units in the rest rows non-conductive, and keeping the voltage applied to the conductive layer at the first voltage; at this time, the voltage difference between the pixel unit covering the display position and the conductive layer is the second voltage-the first voltage, the difference reaches the electric field required by the liquid crystal display, and the voltage difference of the rest area is still zero, so that the display of the set content can be realized.
Specifically, the switch tubes of a certain row of pixel units are provided with a turn-on control voltage V through a first leadonSo that all the switch tubes of the row are conducted, and the voltage V is provided for the switch tubes of the pixel units of other rows through the remaining first conducting wireGoffSo that the pixel units in other rows are not conductive.
And for the conducted pixel units, a second voltage is provided for a second conducting wire connected with the source electrode or the collector electrode of the switching tube of the pixel unit covering the display position, the electric field formed between the area and the corresponding area of the conducting layer is the second voltage-the first voltage, and the difference value reaches the electric field required by liquid crystal display. And providing a first voltage for a second wire connected with the source electrode or the collector electrode of the switch tube of the rest pixel units of the row, wherein the electric fields formed between the areas and the corresponding areas of the conducting layer are all zero.
For the non-conductive pixel units, because the switch tube is not conductive, the voltage of the previously pre-charged energy storage capacitor C1 cannot be charged and discharged, so that the voltages corresponding to the pixel units are equal to the voltage of the energy storage capacitor, which are all the first voltages, and the electric fields formed between the areas and the corresponding areas of the conductive layer are all zero.
Therefore, the setting contents are displayed at the display position, and the remaining area is not affected.
(3) In the second half period of voltage application, aiming at a certain row of pixel units, a third voltage is applied to the pixel units covering the display position, the rest of the pixel units still keep the first voltage, the pixel units in the rest of the rows are not conducted, and the voltage applied to the conductive layer is also kept as the first voltage; at this time, the voltage difference between the pixel unit and the conductive layer covering only the display position is | third voltage-first voltage |, which reaches the electric field required for liquid crystal display, and the voltage difference of the remaining area is still zero, so that the voltage difference of the remaining area is still zero for the display of the set content.
The specific voltage control implementation is the same as the previous half cycle, and is not described again.
The first half period and the second half period can be interchanged, and any half period can be selected to realize display.
It can be understood that the values of the second voltage and the first voltage and the difference value thereof are determined by the characteristics of the bistable liquid crystal layer, and can be obtained by those skilled in the art through limited implementation.
As a more specific embodiment, taking the example of displaying the setting content in the pixel cell K corresponding to VG1 and VS1 in fig. 2, the first voltage is selected as the voltage Vcom, the second voltage is selected as 6Vcom, and the third voltage is selected as zero; in the following figures, only the voltage application of 3 pixel units adjacent to the pixel unit and the voltage difference with the conductive layer are shown.
Initially, applying a voltage Vcom to each pixel electrode and the conductive layer of the base layer respectively, wherein at this time, a voltage difference between each pixel unit of the conductive layer and each pixel unit of the base layer is zero; a schematic diagram of voltage application of each pixel unit on the base layer and a voltage difference between the conductive layer and the base layer are shown in fig. 4(a) - (b).
In the first half period of voltage application, applying a conduction control voltage to a switching tube connected with the first conducting wire VG1, applying a voltage Vcom + Vd to a pixel unit K through a second conducting wire VS1, and applying a voltage Vcom to the rest pixel units connected with the first conducting wire VG1 through second conducting wires VS2-VS 6; the TFT connected with the first lead VG2-VG4 is applied with turn-off voltage, so that the switch tubes are not conductive.
Thus, the voltage applied to the pixel unit K is Vcom + Vd, the voltage Vcom is still maintained in the remaining pixel units, and the voltage applied to the conductive layer is also maintained as the voltage Vcom; at this time, only the voltage difference between the pixel unit K and the conductive layer is the erasing voltage Vd, and the voltage difference of the rest areas is still zero, so that the display of the set content can be realized; a schematic diagram of voltage application of each pixel unit on the base layer and a voltage difference between the conductive layer and the base layer are shown in fig. 5(a) - (b).
In the second half period of voltage application, a conducting control voltage is applied to the switching tube connected with the first conducting wire VG1, a voltage Vcom-Vd is applied to the pixel unit K through the second conducting wire VS1, and a voltage Vcom is applied to the rest pixel units connected with the first conducting wire VG1 through the second conducting wires VS2-VS 6; the first conducting wires VG2-VG4 are used for applying turn-off voltage to the switching tubes connected with the first conducting wires VG2-VG4, so that the switching tubes are not conducted. Thus, the voltage applied to the pixel unit K is Vcom-Vd, the voltage Vcom is still maintained in the remaining pixel units, and the voltage applied to the conductive layer is also maintained as the voltage Vcom; at this time, only the voltage difference between the pixel unit K and the conductive layer is the voltage Vd, and the voltage difference of the rest areas is still zero, so that the display of the set content can be realized; a schematic diagram of voltage application of each pixel unit on the base layer and a voltage difference between the conductive layer and the base layer are shown in fig. 6(a) - (b).
As can be seen from fig. 4(a) -6 (b), the voltage difference (electric field) formed between the pixel unit and the conductive layer at the display position reaches the electric field required for liquid crystal display, and the electric fields at the rest positions are all zero and are not affected.
The display function of the liquid crystal writing device may be present alone or in combination with the partial erasing function, and the functions may be switched as needed when the liquid crystal writing device is used.
The liquid crystal writing device of this embodiment can realize wanting the demonstration of demonstration position, makes things convenient for the mr to the demonstration of some complex formulas, content or images at the teaching in-process, improves and writes efficiency.
EXAMPLE III
According to an embodiment of the present invention, an embodiment of a liquid crystal writing device with a display function is disclosed, including: the conductive layer, the bistable liquid crystal layer and the substrate layer are arranged from top to bottom in sequence. The conducting layer is not divided, a plurality of pixel units are integrated on the substrate layer, the pixel units are arranged in an array mode, and a pixel electrode and a switching tube connected with the pixel electrode are arranged in each pixel unit; the switch tube is conducted to provide voltage for the pixel electrode connected with the switch tube.
The structure is the same as that of the liquid crystal writing device in the first embodiment;
the difference between this embodiment and the liquid crystal writing device in the first embodiment is that the liquid crystal writing device with the display function in this embodiment further integrates, on the substrate layer:
the control unit is configured to control and set the conduction of the switch tubes and the input voltage, and the switch tubes and the conducting layers form an electric field at a spatial overlapping position so that the liquid crystal writing device presents a display state in a set first area; in the first area, the conduction and input voltage of a set switch tube in each row/column are sequentially controlled in a row/column driving erasing mode, and an electric field is formed at the space overlapping position of a pixel electrode and a conductive layer which are connected with the switch tubes, so that a sub-area covered by the pixel electrode is in an erasing state; and after the driving of the first area is finished, driving the next area until the display of the set content is finished.
The specific voltage control method is as follows:
receiving a display instruction of the set content and acquiring a display position;
firstly, controlling and setting the conduction and input voltage of switch tubes, and enabling the liquid crystal writing device to present a display state in a set first area by electric fields formed at the spatial overlapping positions of the switch tubes and the conducting layer;
then in the first area, sequentially controlling the conduction and input voltage of a set switch tube in each row/column in a row/column driving erasing mode, and enabling a sub-area covered by the pixel electrode to be in an erasing state by an electric field formed by the pixel electrode and the conducting layer which are connected by the switch tubes at the space overlapping position;
and after the driving of the first area is finished, driving the next area until the display of the set content is finished.
The voltage driving mode for realizing erasing is similar to the voltage driving mode for realizing displaying, only the input voltage of the switch tube is controlled to control the electric field applied to the area to reach the electric field required by liquid crystal erasing, and the specific voltage application process is not repeated.
Example four
According to the embodiment of the invention, an embodiment of an electronic schoolbag is disclosed, which is realized by adopting a liquid crystal writing device disclosed in the first embodiment or the third embodiment, wherein the liquid crystal writing device is internally provided with:
the display control module is configured to select display content and display the display content at a set position of the liquid crystal writing device;
the writing control module is configured to be used for realizing writing at a set position on the liquid crystal writing device;
the erasing control module is configured to erase the content of the set position on the liquid crystal writing device;
the data transmission module is configured to be used for realizing data transmission between the liquid crystal writing device and other terminal equipment;
and the data storage module is configured to store the set writing or display contents according to a time sequence.
Wherein, the display content comprises: book content, exercise or exercise books or drawing books.
In this embodiment, the electronic schoolbag can obtain the book content and the exercise book content of each lesson from the cloud, the storage system or through the network for displaying, and can perform annotation/recording on the basis of displaying the contents; the exercise book, the exercise book or the drawing book can be displayed, writing/drawing, erasing or storing can be carried out on the basis, and the storing can be carried out according to the time sequence, so that the stored contents can be recorded page by page like a real book; and meanwhile, the stored content can be called out for reference/editing.
In the embodiment, the electronic schoolbag integrates a book, an exercise book, a homework book, a writing pen and an eraser, paper consumables are not needed, eyes of students are protected to the maximum degree, meanwhile, the learning and review of the students are greatly facilitated, and the classroom display efficiency is improved.
EXAMPLE five
According to the embodiment of the invention, an embodiment of a liquid crystal large screen is disclosed, the liquid crystal large screen is realized by adopting a liquid crystal writing device disclosed in the first embodiment or the third embodiment, and the liquid crystal writing device is internally provided with:
the display control module is configured to select display content and display the display content at a set position of the liquid crystal writing device;
the writing control module is configured to be used for realizing writing at a set position on the liquid crystal writing device;
the erasing control module is configured to erase the content of the set position on the liquid crystal writing device;
the data transmission module is configured to be used for realizing data transmission between the liquid crystal writing device and other terminal equipment;
and the data storage module is configured to store the set writing or display contents according to a time sequence.
The display position and the writing area can be divided on the liquid crystal large screen; or, the display position and the writing area of the liquid crystal large screen are set automatically. Thus, the set content can be displayed and simultaneously marked or explained; the user does not need to spend too long time for writing on the blackboard, so that the time can be saved, and the efficiency is improved.
Certainly, the set position of the large liquid crystal screen can also be provided with a liquid crystal display screen to realize playing of dynamic contents such as animation, video and the like.
The liquid crystal large screen can be used in places such as classrooms and offices, and can integrate writing, displaying, erasing, storing, communicating and other functions.
EXAMPLE six
According to the embodiment of the invention, an embodiment of a smart classroom is disclosed, wherein the smart classroom comprises an electronic schoolbag in the fourth embodiment, a liquid crystal large screen in the fifth embodiment and a teacher terminal;
the three are communicated with each other to realize data transmission, and the contents displayed or written on the electronic book package can be synchronously displayed on the teacher terminal; the teacher terminal can control the content displayed on the liquid crystal large screen or the electronic book pack, and intelligent teaching is achieved.
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 present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.

Claims (16)

1. A bistable liquid crystal writing device having an electrically driven display and a pressure display, comprising: the conductive layer, the bistable liquid crystal layer and the substrate layer are arranged in sequence; the base layer includes:
the pixel units are arranged in an array shape, and each pixel unit is internally provided with a pixel electrode and a switching tube connected with the pixel electrode;
the control unit is configured to adopt a line-by-line driving mode, and based on the display position in each line, the control unit inputs set voltage for corresponding pixel electrodes by controlling the conducting state and the input voltage of the switch tube set in each line, so that the pixel electrodes and the conductive layer form set electric fields at the position where the pixel electrodes and the conductive layer are overlapped in space, and finally display of the content to be displayed is realized;
the rows may be replaced with columns.
2. A bistable liquid crystal writing device having an electrically driven display and a pressure display, comprising: the conductive layer, the bistable liquid crystal layer and the substrate layer are arranged in sequence; the base layer includes:
the pixel units are arranged in an array shape, and each pixel unit is internally provided with a pixel electrode and a switching tube connected with the pixel electrode;
the control unit is configured to control and set the conducting state and the input voltage of the switch tubes, and the electric fields formed by the switch tubes and the conducting layers at the spatial overlapping positions firstly enable the liquid crystal writing device to present a display state in a first area formed by a plurality of set lines; then in the first area, sequentially controlling the conducting state and the input voltage of a set switch tube in each row in a row-by-row driving erasing mode, and enabling a sub-area covered by the pixel electrode to be in an erasing state by an electric field formed by the pixel electrode and the conducting layer which are connected by the switch tubes at the spatial overlapping position; and after the driving of the first area is finished, driving the next area until the display of the set content is finished.
3. A bistable liquid crystal writing device having both electric drive and pressure displays as claimed in claim 1 or 2 wherein said bistable liquid crystal layer is a bistable cholesteric liquid crystal capable of writing by pressure.
4. A bistable liquid crystal writing device having an electrically driven display and a pressure display as defined in claim 1 or 2 wherein said substrate layer further has integrated thereon:
a plurality of first wires supplied with control voltage for switching on or off the switching tube;
and a plurality of second wires supplied with the input voltage of the switching tube.
5. The bistable liquid crystal writing device with electric-driven display and pressure display of claim 4, wherein pixel units in a same row share a same first conductive line, and pixel units in a same column share a same second conductive line.
6. The bistable liquid crystal writing device having an electrically driven display and a pressure display of claim 4, wherein said substrate layer further has integrated thereon:
the switch tube control end driving unit is used for providing required on-off control voltage for the first lead;
and the switching tube input end driving unit is used for providing required input voltage for the second conducting wire.
7. A bistable liquid crystal writing device with electric drive display and pressure display as claimed in claim 1 or 2 wherein said switching tube is further connected to an energy storage element, the leading line of said energy storage element being connected to the electrode leading line of said conductive layer.
8. A bistable liquid crystal writing device having both an electrically driven display and a pressure display as claimed in claim 1 or 2 wherein electrodes are respectively led out on the base layer and the conductive layer; alternatively, the electrode line of the conductive layer is connected to the base layer, and the electrode is drawn only from the base layer.
9. A method of displaying a bistable liquid crystal writing device as defined in claim 1, comprising:
receiving a display instruction of the set content and acquiring a display position;
and a line-by-line driving display mode is adopted, based on the display position of each line, the set voltage is input for the corresponding pixel electrode by sequentially controlling the conduction state and the input voltage of the switch tube set in each line, so that the pixel electrodes and the conductive layer form a set electric field at the position where the pixel electrodes and the conductive layer are overlapped in space, and finally the display of the content to be displayed is realized.
10. The display method according to claim 9, wherein the specific voltage applying process comprises:
controlling all the switch tubes in the set area of the substrate layer to be conducted, applying a second voltage to all the pixel units, and applying a second voltage to the conductive layer;
keeping the conductive layer applying a second voltage, keeping the switching tubes of the pixel units in the row needing display driving conducted, and applying a first voltage to the switching tubes set in the pixel units;
and the rest of the switch tubes are not conducted or second voltage is applied, so that the display of the position to be displayed in the row can be realized.
11. A method of displaying a bistable liquid crystal writing device as defined in claim 2, comprising:
receiving a display instruction of the set content and acquiring a display position;
controlling and setting the conducting state and the input voltage of the switch tubes, wherein the switch tubes and the conducting layers form an electric field at a spatial overlapping position, so that the liquid crystal writing device presents a display state in a first area formed by a plurality of set lines;
in the first area, the conducting state and the input voltage of a set switch tube in each row are sequentially controlled in a row-by-row driving erasing mode, and an electric field is formed at the space overlapping position of a pixel electrode and a conducting layer which are connected with the switch tubes, so that a sub-area covered by the pixel electrode is in an erasing state;
and after the driving of the first area is finished, driving the next area until the display of the set content is finished.
12. An electronic schoolbag, comprising: a liquid crystal writing instrument having a display function according to any one of claims 1 to 8; the liquid crystal writing device is internally provided with:
the display control module is configured to select display content and display the display content at a set position of the liquid crystal writing device;
the writing control module is configured to be used for realizing writing at a set position on the liquid crystal writing device;
the erasing control module is configured to erase the content of the set position on the liquid crystal writing device;
the data transmission module is configured to be used for realizing data transmission between the liquid crystal writing device and other terminal equipment;
and the data storage module is configured to store the set writing or display contents according to a time sequence.
13. The electronic book of claim 12, wherein the display content comprises: book content, exercise or exercise books or drawing books.
14. A liquid crystal large panel, comprising: a liquid crystal writing instrument having a display function according to any one of claims 1 to 8; the liquid crystal writing device is internally provided with:
the display control module is configured to select display content and display the display content at a set position of the liquid crystal writing device;
the writing control module is configured to be used for realizing writing at a set position on the liquid crystal writing device;
the erasing control module is configured to erase the content of the set position on the liquid crystal writing device;
the data transmission module is configured to be used for realizing data transmission between the liquid crystal writing device and other terminal equipment;
and the data storage module is configured to be used for realizing the storage of the set writing or display content.
15. The liquid crystal large panel according to claim 14, wherein the liquid crystal large panel divides a display position and a writing area; or, the display position and the writing area of the liquid crystal large screen are set automatically.
16. A smart classroom, comprising: an electronic bag as claimed in any one of claims 12 to 13, a liquid crystal large screen as claimed in any one of claims 14 to 15, and a teacher's terminal; the electronic schoolbag, the liquid crystal large screen and the teacher terminal are communicated with each other; the display or writing content on the electronic schoolbag can be synchronously displayed on the teacher terminal.
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