CN112731707A - Liquid crystal writing device with writing display and electric driving display and method - Google Patents
Liquid crystal writing device with writing display and electric driving display and method Download PDFInfo
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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
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
-
- 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
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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
- G02F1/136—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
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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
- G06F3/0412—Digitisers structurally integrated in a display
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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
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
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- 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 liquid crystal writing device with a display function and a method thereof, wherein the liquid crystal writing device comprises: the conductive layer, the bistable liquid crystal layer and the substrate layer are arranged in sequence; a plurality of pixel units which are arranged in an array shape are integrated on the substrate layer, and a pixel electrode and a voltage control circuit connected with the pixel electrode are arranged in each pixel unit; the voltage control circuit can load a set voltage for a pixel electrode at a position needing to be displayed so that the pixel electrode and the conducting layer form a set electric field at a spatial overlapping position to realize the display of set contents. The liquid crystal writing device can display the set content, so that a teacher can directly display some contents such as formulas or diagrams on the liquid crystal blackboard during teaching without writing by himself, a large amount of writing time is saved, and some complex contents can be displayed on the liquid crystal blackboard, and a better teaching purpose is achieved.
Description
Technical Field
The invention relates to the technical field of liquid crystal writing board structures, in particular to a liquid crystal writing device with writing display and electric driving display and a method.
Background
The liquid crystal writing device on the market at present uses the bistable characteristic of liquid crystal to realize pressure writing/erasing. For example, cholesteric liquid crystal is used as a writing film, the writing pressure track of a writing pen is recorded by changing the liquid crystal state at a pen point through the pressure acting on a liquid crystal writing board, and then corresponding writing contents are displayed; the cholesteric liquid crystal phase is changed by applying an electric field, so that the writing pressure trace on the liquid crystal writing board disappears to realize erasing.
The liquid crystal writing device capable of realizing local erasing disclosed by the prior art is basically of a soft film structure, namely a first layer of PET conducting layer, a liquid crystal layer and a second layer of PET conducting layer are sequentially arranged, the two layers of PET conducting layers are respectively divided through an etching technology to form different conducting areas, and an erasing electric field is formed in an area to be erased by applying different voltages to each conducting area so as to achieve the purpose of local erasing.
However, in this way, it is difficult to segment the extremely small pixels, and if the pixels are too small (e.g., less than 1mm x 1mm), the probability of generating line break is greatly increased; the smaller the pixel is, along with the increase of writing number of times, the more the risk that the broken string appears is, is unfavorable for producing the long-term stability of product performance.
In addition, the current bistable cholesteric liquid crystal writing device is limited by a voltage control mode, adopts a writing display mode and does not have an electrically driven display scheme.
Although the existing liquid crystal display panel can realize electric drive display, the writing of the existing liquid crystal display panel is not realized by utilizing pressure writing, and the real writing feeling and writing effect cannot be restored; the display of the display screen is maintained by electric drive, and once the power is off, the display screen disappears; moreover, a backlight plate or a self-luminous element is required to be arranged in the LED lamp, and visual fatigue is easily caused after long-time use.
The existing electronic paper/electronic ink is composed of a substrate as the lower layer, an electronic ink composed of countless tiny transparent particles is coated on the lower layer, the particles are formed by sealing a plurality of black and white particles with positive and negative electricity in an internal liquid microcapsule, the charged particles with different colors can move towards different directions due to different applied electric fields, and the black or white effect is presented on the surface of a display screen. The product can realize writing and active display, but the writing of the product is not realized by pressure, and the real writing feeling and writing effect cannot be restored; meanwhile, the writing process is delayed, and a special writing pen is required to be used; moreover, the product has high cost and is not suitable for products with large screens.
Disclosure of Invention
In order to solve the problems, the invention provides a liquid crystal writing device and a liquid crystal writing method with writing display and electric drive display, which can avoid the occurrence of line breaking caused by continuous writing on the premise of realizing extremely small pixel point segmentation, can realize the writing display and the electric drive display at the same time, and fully restore the real writing feeling and writing track.
In order to achieve the above object, according to a first aspect of the present invention, there is provided a liquid crystal writing device having a writing display and an electrically driven 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 voltage control circuit connected with the pixel electrode;
the voltage control circuit includes: a plurality of X-axis wires arranged in rows, a plurality of Y-axis wires arranged in columns, and a plurality of auxiliary wires; the X-axis lead and the Y-axis lead are arranged in a crossed manner, and the pixel electrode is positioned at the crossed position; each pixel electrode is respectively connected with the corresponding X-axis lead and the corresponding Y-axis lead through a diode, the anodes of the two diodes are connected with the pixel electrodes together, and the pixel electrodes are connected with the corresponding auxiliary leads through resistors.
According to a second aspect of the present invention, there is provided a liquid crystal writing device having a writing display and an electrically driven 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 voltage control circuit connected with the pixel electrode;
the voltage control circuit includes: a plurality of X-axis wires arranged in rows, a plurality of Y-axis wires arranged in columns, and a plurality of auxiliary wires; the X-axis lead and the Y-axis lead are arranged in a crossed manner, and the pixel electrode is positioned at the crossed position; each pixel electrode is respectively connected with the corresponding X-axis lead and the corresponding Y-axis lead through a diode, the cathodes of the two diodes are connected with the pixel electrodes together, and the cathodes of the two diodes are connected with the corresponding auxiliary leads through resistors.
As a further scheme, the method further comprises the following steps:
and the control unit is configured to control voltages input to the X-axis lead, the Y-axis lead and the auxiliary lead based on the display position in each row/column of pixel electrodes in a row/column driving manner, and apply set voltages to the pixel electrodes of the row at the display position required by the row, so that the pixel electrodes and the conductive layers form set electric fields at the positions where the pixel electrodes and the conductive layers are overlapped in space, and electrically-driven display is realized.
As a further scheme, the method further comprises the following steps:
a control unit configured to control voltages input to the X-axis wire, the Y-axis wire, and the auxiliary wire, apply a set first voltage to pixel electrodes corresponding to a set target area, and cause the target area to be in a display state by an electric field formed between the pixel electrodes and the conductive layer; and then in the target area, controlling the voltage input to the pixel electrode of each row in a row/column driving erasing mode so as to enable the pixel electrode set in the row to be in an erasing state.
According to a third aspect of the present invention, there is provided a liquid crystal writing method having a writing display and an electrically-driven display, comprising:
receiving a display instruction of the set content and acquiring a display position;
and the row-by-row/column driving mode is adopted, the voltages input to the X-axis lead, the Y-axis lead and the auxiliary lead are controlled based on the display position in each row/column of pixel electrodes, and the set voltage is loaded to the pixel electrodes of the row at the position needing to be displayed, so that the pixel electrodes and the conductive layers form a set electric field at the position where the pixel electrodes and the conductive layers are overlapped in space, and the electric driving display is realized.
According to a fourth aspect of the present invention, there is provided a liquid crystal writing method having a writing display and an electrically-driven display, comprising:
receiving a display instruction of the set content and acquiring a display position;
controlling the voltage input to the X-axis lead, the Y-axis lead and the auxiliary lead, loading a set first voltage for the pixel electrode corresponding to a set target area, and forming an electric field between the pixel electrode and the conductive layer to enable the target area to be in a display state; and then in the target area, controlling the voltage input to the pixel electrode of each row in a row/column driving erasing mode so as to enable the pixel electrode set in the row to be in an erasing state.
According to a sixth aspect of the present invention, there is provided an electronic schoolbag, comprising: the liquid crystal writing device having writing display and electrically driven display; 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 erasing control module is configured to erase the content of the set position on the liquid crystal writing device;
and the data transmission module is configured to be used for realizing data transmission between the liquid crystal writing device and other terminal equipment.
According to a sixth aspect of the present invention, there is provided a liquid crystal large panel comprising: the liquid crystal writing device having writing display and electrically driven display; 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 erasing control module is configured to erase the content of the set position on the liquid crystal writing device;
and the data transmission module is configured to be used for realizing data transmission between the liquid crystal writing device and other terminal equipment.
According to a seventh aspect of the present invention, there is provided a smart classroom including: the electronic schoolbag, the liquid crystal large screen and the 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 invention adopts the semiconductor process to integrate the array pixel units on the substrate layer of the bottom layer, can reduce the pixel points to be within 0.1mm x 0.1mm, and the process can ensure that the line breaking condition caused by continuous writing can not occur under the condition of the process of extremely small pixel points, thereby reducing the process flow and the control complexity and improving the control precision.
(2) The liquid crystal writing device can display the set content by reasonably applying voltage without dividing the top conducting layer, so that a teacher can directly display some contents such as formulas or diagrams on the liquid crystal blackboard during teaching without writing by himself, a large amount of writing time is saved, and meanwhile some complex contents can be displayed on the liquid crystal blackboard, 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 is low in cost, realizes display by reflecting an external natural light source, does not need a backlight plate or a self-luminous element, saves electricity consumption, does not have electromagnetic radiation, and can protect eyes more during use.
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 present invention;
FIG. 3(a) is an equivalent circuit diagram of the embodiment disclosed in FIG. 2;
FIG. 3(b) is a graph showing the voltage conditions of each pixel unit on the base layer in the embodiment disclosed in FIG. 2;
FIG. 3(c) is the voltage difference between the substrate layer and the conductive layer in the embodiment disclosed in FIG. 2;
FIG. 4 is a schematic diagram of another exemplary integrated circuit structure on a substrate layer in accordance with an embodiment of the present invention;
FIG. 5(a) is an equivalent circuit diagram of the embodiment disclosed in FIG. 4;
FIG. 5(b) is a graph showing the voltage conditions of each pixel unit on the base layer in the embodiment disclosed in FIG. 4;
fig. 5(c) is a voltage difference between the base layer and the conductive layer in the embodiment disclosed in fig. 4.
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 having a writing display and an electrically driven display is disclosed, and referring 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 each pixel unit is internally provided with a pixel electrode and a voltage control circuit connected with the pixel electrode; the voltage control circuit can control the voltage applied to the corresponding pixel unit.
The voltage control circuit can load a set voltage for a pixel electrode at a position needing to be displayed so that the pixel electrode and the conductive layer form a set electric field at a spatial overlapping position, and display of set contents is achieved.
The liquid crystal writing device having writing display and electrically driven display further includes:
and the control unit is configured to control voltages input to the X-axis lead, the Y-axis lead and the auxiliary lead based on the display position in each row/column of pixel electrodes in a row/column driving manner, and apply set voltages to the pixel electrodes of the row at the display position required by the row, so that the pixel electrodes and the conductive layers form set electric fields at the positions where the pixel electrodes and the conductive layers are overlapped in space, and electrically-driven display is realized.
In this embodiment, the bistable liquid crystal layer is a bistable cholesteric liquid crystal capable of writing by pressure. The liquid crystal can realize pressure writing display when receiving pressure; when the set first electric field is received, the erasing state can be presented; when receiving the set second electric field action, the display device can be in an electrically driven display state. The specific values of the first electric field and the second electric field are determined according to the property and the thickness of the bistable cholesteric liquid crystal.
Specifically, referring to fig. 2, the voltage control circuit specifically includes:
on the base layer, several X-axis wires (X1 … Xn) and Y-axis wires (Y1 … Ym) integrated along the X-axis direction and the Y-axis direction, respectively, and several auxiliary wires integrated along the X-axis direction or the Y-axis direction;
n and m respectively represent the number of X-axis wires and Y-axis wires, and the values of the X-axis wires and the Y-axis wires are set according to the size of the liquid crystal writing area and can be equal or unequal.
Each pixel electrode is respectively connected with the X-axis lead and the Y-axis lead adjacent to the pixel electrode through a diode, and the anodes of the two diodes are connected with the pixel unit and are connected with the auxiliary lead adjacent to the pixel unit through a resistor.
Of course, each pixel electrode is connected to only one X-axis conductive line, Y-axis conductive line, and auxiliary conductive line adjacent thereto, as in the following embodiments.
The display method based on the circuit structure specifically comprises the following steps:
and the row-by-row/column driving mode is adopted, the voltages input to the X-axis lead, the Y-axis lead and the auxiliary lead are controlled based on the display position in each row/column of pixel electrodes, and the set voltage is loaded to the pixel electrodes of the row at the position needing to be displayed, so that the pixel electrodes and the conductive layers form a set electric field at the position where the pixel electrodes and the conductive layers are overlapped in space, and the electric driving display is realized.
Referring to fig. 3(a), it is an equivalent circuit diagram between the base layer and the conductive layer in the embodiment;
providing a voltage Vcom to the conductive layer and a voltage Vh + Vcom to the auxiliary conductor; the voltages Vh + Vcom or floating are respectively provided for the X-axis conducting wires and the Y-axis conducting wires connected with the pixel electrodes covering the positions to be displayed in each row/column, the reference voltages Vcom are provided for the other X-axis conducting wires and the other Y-axis conducting wires, and the voltages of the two electrodes of the capacitor in the figure are equivalent to the voltages loaded on the substrate layer and the conductive layer.
In each pixel unit of each row/column, because the X-axis conducting wire and the Y-axis conducting wire connected with the pixel electrode covering the position to be displayed provide voltage Vh + Vcom or float, at the moment, two diodes of the pixel electrode connected with the X-axis conducting wire and the Y-axis conducting wire are not conducted, and therefore, the voltage loaded on the pixel electrode covering the position to be displayed is Vh + Vcom; the X-axis line and the Y-axis line connected to the other pixel electrodes provide a voltage Vcom, so that their diodes are all turned on, and thus the voltage applied to the overlying pixel electrode is Vcom.
Taking the voltage condition of each pixel electrode on the substrate layer disclosed in fig. 3(b) as an example, the middle position of the nine-square grid is the voltage Vh + Vcom corresponding to the pixel electrode covering the position to be displayed, and the rest of the squares are all Vcom corresponding to other regions; the X-axis and the Y-axis represent voltages supplied from the X-axis and Y-axis wires to which the pixel electrodes are connected, respectively.
In this embodiment, the voltage control circuit controls the voltage on the pixel electrode covering the position to be displayed in each row/column to be the first voltage Vh + Vcom, and the voltages on the other pixel electrodes to be the second voltage Vcom.
On the basis, referring to fig. 3(c), the voltage Vcom is provided to the conductive layer, and at this time, the electric field formed by the pixel units set in each row of the base layer and the conductive layer can realize the display of the pre-display position, and the other areas are not affected.
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 an embodiment of the present invention, an embodiment of a liquid crystal writing device having a writing display and an electrically driven display is disclosed, and referring 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 each pixel unit is internally provided with a pixel electrode and a voltage control circuit connected with the pixel electrode; the voltage control circuit can control the voltage applied to the corresponding pixel unit.
The voltage control circuit can load a set voltage for a pixel electrode at a position needing to be displayed so that the pixel electrode and the conductive layer form a set electric field at a spatial overlapping position, and display of set contents is achieved.
The liquid crystal writing device having writing display and electrically driven display further includes:
and the control unit is configured to control voltages input to the X-axis lead, the Y-axis lead and the auxiliary lead based on the display position in each row/column of pixel electrodes in a row/column driving manner, and apply set voltages to the pixel electrodes of the row at the display position required by the row, so that the pixel electrodes and the conductive layers form set electric fields at the positions where the pixel electrodes and the conductive layers are overlapped in space, and electrically-driven display is realized.
The difference between this embodiment and the liquid crystal writing apparatus of the first embodiment is that the structure of the voltage control circuit is different.
Referring to fig. 4, the voltage control circuit specifically includes:
on the base layer, several X-axis wires (X1 … Xn) and Y-axis wires (Y1 … Ym) integrated along the X-axis direction and the Y-axis direction, respectively, and several auxiliary wires integrated along the X-axis direction or the Y-axis direction;
n and m respectively represent the number of X-axis wires and Y-axis wires, and the values of the X-axis wires and the Y-axis wires are set according to the size of the liquid crystal writing film and can be equal or unequal.
Each pixel electrode is respectively connected with the X-axis lead and the Y-axis lead which are adjacent to the pixel electrode through a diode, and the cathodes of the two diodes are connected with the pixel electrode and are connected with the auxiliary lead which is adjacent to the pixel electrode through a resistor.
The display method based on the circuit structure specifically comprises the following steps:
and the row-by-row/column driving mode is adopted, the voltages input to the X-axis lead, the Y-axis lead and the auxiliary lead are controlled based on the display position in each row/column of pixel electrodes, and the set voltage is loaded to the pixel electrodes of the row at the position needing to be displayed, so that the pixel electrodes and the conductive layers form a set electric field at the position where the pixel electrodes and the conductive layers are overlapped in space, and the electric driving display is realized.
Referring to fig. 5(a), it is an equivalent circuit diagram between the base layer and the conductive layer in the embodiment; providing a voltage Vh + Vcom to the conductive layer and a reference voltage Vcom to the auxiliary conductor; the voltages Vcom are respectively provided for the X-axis conductive lines and the Y-axis conductive lines connected to the pixel electrodes covering the positions to be displayed in each row/column, the voltages Vh + Vcom are provided for the other X-axis conductive lines and the other Y-axis conductive lines, and the voltages of the two electrodes of the capacitor in the figure are equivalent to the voltages loaded on the substrate layer and the conductive layer.
Because the X-axis conductive lines and the Y-axis conductive lines connected to the pixel electrodes covering the position to be displayed in each row/column provide the voltage Vcom, at this time, the two diodes of the pixel electrodes connected to the X-axis conductive lines and the Y-axis conductive lines are not conducted, so the voltage loaded on the pixel electrodes covering the position to be displayed is Vcom, and the X-axis conductive lines and the Y-axis conductive lines connected to the other pixel electrodes provide the voltage Vh + Vcom, at this time, the corresponding diodes are conducted, so the voltage loaded on the other pixel electrodes is the voltage Vh + Vcom.
Taking the voltage condition of each pixel electrode on the substrate layer disclosed in fig. 5(b) as an example, the voltage corresponding to the pixel electrode covering the position to be displayed is Vcom in the middle of the nine-square grid, and the voltages corresponding to other regions are Vh + Vcom in the rest of the nine-square grids; the X-axis and the Y-axis represent voltages supplied from the X-axis and Y-axis wires to which the pixel electrodes are connected, respectively.
In this embodiment, the voltage control circuit controls the voltage on the pixel electrode covering the position to be displayed in each row/column to be the first voltage Vcom, and the voltages on the other pixel electrodes to be the second voltage Vh + Vcom.
On the basis, referring to fig. 5(c), the conductive layer is provided with a voltage Vh + VCom, and at this time, the electric field formed by the pixel units and the conductive layer in each row/column of the base layer can realize the display of the pre-display position, and other areas are not affected.
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 each pixel unit is internally provided with a pixel electrode and a voltage control circuit connected with the pixel electrode; the voltage control circuit can control the voltage applied to the corresponding pixel unit.
The structure is the same as that of the liquid crystal writing device in the first embodiment or the second embodiment; based on the above structure, unlike the liquid crystal writing device in the first or second embodiment, the control unit of the liquid crystal writing device having writing display and electrically-driven display in this embodiment may be further configured to control the voltages input to the X-axis conductive line, the Y-axis conductive line, and the auxiliary conductive line, apply a set first voltage to the pixel electrodes corresponding to a set target area, and form an electric field between the pixel electrodes and the conductive layer so that the target area is in a display state; and then in the target area, controlling the voltage input to the pixel electrode of each row in a row/column driving erasing mode so as to enable the pixel electrode set in the row to be in an erasing state.
The specific voltage control method is as follows:
receiving a display instruction of the set content and acquiring a display position;
loading a set first voltage to a set pixel electrode, wherein the first voltage and an electric field formed by the conducting layer at a spatial overlapping position can enable the liquid crystal writing device to present a display state in a set target area;
then, in the target area, loading a set second voltage to the pixel electrode set in each row/column in the target area in a row/column driving erasing mode, wherein the second voltage and an electric field formed by the conducting layer at a spatial overlapping position enable the liquid crystal writing device to present a local erasing state in the set second area;
and finally, displaying the position to be displayed.
The specific implementation method of the foregoing process has been described in detail in the first embodiment or the second embodiment, and is not described again.
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 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 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.
A display area and a writing area can be divided on the liquid crystal large screen; or, the display area 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 (14)
1. A liquid crystal writing device having writing display and electrically driven 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 voltage control circuit connected with the pixel electrode;
the voltage control circuit includes: a plurality of X-axis wires arranged in rows, a plurality of Y-axis wires arranged in columns, and a plurality of auxiliary wires; the X-axis lead and the Y-axis lead are arranged in a crossed manner, and the pixel electrode is positioned at the crossed position; each pixel electrode is respectively connected with the corresponding X-axis lead and the corresponding Y-axis lead through a diode, and the anodes of the two diodes are connected with the pixel unit and are connected with the corresponding auxiliary leads through resistors.
2. A liquid crystal writing device having writing display and electrically driven 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 voltage control circuit connected with the pixel electrode;
the voltage control circuit includes: a plurality of X-axis wires arranged in rows, a plurality of Y-axis wires arranged in columns, and a plurality of auxiliary wires; the X-axis lead and the Y-axis lead are arranged in a crossed manner, and the pixel electrode is positioned at the crossed position; each pixel electrode is respectively connected with the corresponding X-axis lead and the corresponding Y-axis lead through a diode, and the cathodes of the two diodes are connected with the pixel unit and are connected with the corresponding auxiliary leads through resistors.
3. A liquid crystal writing instrument having a writing display and an electrically driven display according to any one of claims 1 to 2, further comprising:
and the control unit is configured to control voltages input to the X-axis lead, the Y-axis lead and the auxiliary lead based on the display position in each row/column of pixel electrodes in a row/column driving manner, and apply set voltages to the pixel electrodes of the row at the display position required by the row, so that the pixel electrodes and the conductive layers form set electric fields at the positions where the pixel electrodes and the conductive layers are overlapped in space, and electrically-driven display is realized.
4. A liquid crystal writing instrument having a writing display and an electrically driven display according to any one of claims 1 to 2, further comprising:
a control unit configured to control voltages input to the X-axis wire, the Y-axis wire, and the auxiliary wire, apply a set first voltage to pixel electrodes corresponding to a set target area, and cause the target area to be in a display state by an electric field formed between the pixel electrodes and the conductive layer; and then in the target area, controlling the voltage input to the pixel electrode of each row in a row/column driving erasing mode so as to enable the pixel electrode set in the row to be in an erasing state.
5. A liquid crystal writing instrument with a writing display and an electrically driven display as in any of claims 1-2, wherein the bistable liquid crystal layer is a bistable cholesteric liquid crystal capable of writing by pressure.
6. A liquid crystal writing method having writing display and electrically driven display, comprising:
receiving a display instruction of the set content and acquiring a display position;
and the row-by-row/column driving mode is adopted, the voltages input to the X-axis lead, the Y-axis lead and the auxiliary lead are controlled based on the display position in each row/column of pixel electrodes, and the set voltage is loaded to the pixel electrodes of the row at the position needing to be displayed, so that the pixel electrodes and the conductive layers form a set electric field at the position where the pixel electrodes and the conductive layers are overlapped in space, and the electric driving display is realized.
7. A liquid crystal writing method having writing display and electrically driven display, comprising:
receiving a display instruction of the set content and acquiring a display position;
controlling the voltage input to the X-axis lead, the Y-axis lead and the auxiliary lead, loading a set first voltage for the pixel electrode corresponding to a set target area, and forming an electric field between the pixel electrode and the conductive layer to enable the target area to be in a display state; and then in the target area, controlling the voltage input to the pixel electrode of each row in a row/column driving erasing mode so as to enable the pixel electrode set in the row to be in an erasing state.
8. An electronic schoolbag, comprising: a liquid crystal writing instrument having a writing display and an electrically driven display as defined in any one of claims 1 to 5; 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 erasing control module is configured to erase the content of the set position on the liquid crystal writing device;
and the data transmission module is configured to be used for realizing data transmission between the liquid crystal writing device and other terminal equipment.
9. The electronic book of claim 8, further comprising: and the data storage module is configured to store the set writing or display contents according to a time sequence.
10. The electronic book of claim 8, wherein the display content comprises: book content, exercise or exercise books or drawing books.
11. A liquid crystal large panel, comprising: a liquid crystal writing instrument having a writing display and an electrically driven display as defined in any one of claims 1 to 5; 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 erasing control module is configured to erase the content of the set position on the liquid crystal writing device;
and the data transmission module is configured to be used for realizing data transmission between the liquid crystal writing device and other terminal equipment.
12. The liquid crystal large panel according to claim 11, further comprising: and the data storage module is configured to be used for realizing the storage of the set writing or display content.
13. The liquid crystal large panel according to claim 11, 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.
14. A smart classroom, comprising: an electronic bag as claimed in any one of claims 8 to 10, a liquid crystal large screen as claimed in any one of claims 11 to 13, 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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| CN202010955957.7A CN112180628A (en) | 2020-09-11 | 2020-09-11 | Liquid crystal writing device, local erasing method and display method |
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| CN202110196522.3A Active CN112748600B (en) | 2020-09-11 | 2021-02-22 | Writing device and method for locally erasing liquid crystal |
| CN202120393362.7U Active CN214151308U (en) | 2020-09-11 | 2021-02-22 | Bistable liquid crystal writing device, electronic schoolbag, liquid crystal large screen and intelligent classroom |
| CN202210254357.7A Pending CN114706241A (en) | 2020-09-11 | 2021-02-22 | Liquid crystal writing device with writing display and electric driving display and method |
| CN202110196926.2A Active CN112731706B (en) | 2020-09-11 | 2021-02-22 | Bistable liquid crystal writing device with electric drive display and pressure display and method |
| CN202110196953.XA Active CN112711151B (en) | 2020-09-11 | 2021-02-22 | Bistable liquid crystal writing device with electric drive display and pressure display and method |
| CN202110196944.0A Active CN112731707B (en) | 2020-09-11 | 2021-02-22 | Liquid crystal writing device with writing display and electric driving display and method |
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| CN202110196522.3A Active CN112748600B (en) | 2020-09-11 | 2021-02-22 | Writing device and method for locally erasing liquid crystal |
| CN202120393362.7U Active CN214151308U (en) | 2020-09-11 | 2021-02-22 | Bistable liquid crystal writing device, electronic schoolbag, liquid crystal large screen and intelligent classroom |
| CN202210254357.7A Pending CN114706241A (en) | 2020-09-11 | 2021-02-22 | Liquid crystal writing device with writing display and electric driving display and method |
| CN202110196926.2A Active CN112731706B (en) | 2020-09-11 | 2021-02-22 | Bistable liquid crystal writing device with electric drive display and pressure display and method |
| CN202110196953.XA Active CN112711151B (en) | 2020-09-11 | 2021-02-22 | Bistable liquid crystal writing device with electric drive display and pressure display and method |
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| CN113433748B (en) * | 2021-07-07 | 2023-04-11 | 珠海市唯酷科技有限公司 | Liquid crystal handwriting film with local erasing function and electronic writing equipment |
| CN113760125A (en) * | 2021-08-13 | 2021-12-07 | 山东蓝贝思特教装集团股份有限公司 | Double-layer bistable liquid crystal writing device and method |
| CN113741077B (en) * | 2021-08-13 | 2023-05-02 | 山东蓝贝思特教装集团股份有限公司 | Single-layer bistable liquid crystal copying device and method |
| CN113419367B (en) * | 2021-08-23 | 2021-11-02 | 山东蓝贝思特教装集团股份有限公司 | Method and device for determining illumination area on TFT substrate |
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| CN113741747A (en) * | 2021-08-24 | 2021-12-03 | 山东蓝贝思特教装集团股份有限公司 | Liquid crystal writing device and method with adjustable local erasing area |
| CN113741080B (en) * | 2021-08-27 | 2023-06-13 | 山东蓝贝思特教装集团股份有限公司 | Optical writing pen for liquid crystal writing device and writing display method |
| CN114203120A (en) * | 2021-11-16 | 2022-03-18 | 北京奕斯伟计算技术有限公司 | Liquid crystal handwriting board and driving circuit and driving method thereof |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN112731706A (en) | 2021-04-30 |
| CN112711151B (en) | 2022-08-05 |
| CN112711151A (en) | 2021-04-27 |
| CN112748600A (en) | 2021-05-04 |
| CN112180628A (en) | 2021-01-05 |
| CN112731707B (en) | 2022-07-05 |
| CN112731706B (en) | 2022-08-05 |
| CN114706241A (en) | 2022-07-05 |
| CN112748600B (en) | 2022-08-05 |
| CN214151308U (en) | 2021-09-07 |
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