CN117590633A - Transparent liquid crystal film handwriting board for local erasing - Google Patents
Transparent liquid crystal film handwriting board for local erasing Download PDFInfo
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- CN117590633A CN117590633A CN202311491549.0A CN202311491549A CN117590633A CN 117590633 A CN117590633 A CN 117590633A CN 202311491549 A CN202311491549 A CN 202311491549A CN 117590633 A CN117590633 A CN 117590633A
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 66
- 239000000758 substrate Substances 0.000 claims abstract description 18
- 238000007789 sealing Methods 0.000 claims abstract description 12
- 239000004986 Cholesteric liquid crystals (ChLC) Substances 0.000 claims description 19
- 238000004891 communication Methods 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 4
- 239000012780 transparent material Substances 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims 3
- 238000004804 winding Methods 0.000 claims 3
- 239000000919 ceramic Substances 0.000 claims 1
- 238000009413 insulation Methods 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 abstract description 2
- 230000005684 electric field Effects 0.000 description 11
- 238000000034 method Methods 0.000 description 11
- 238000010438 heat treatment Methods 0.000 description 10
- 229920002799 BoPET Polymers 0.000 description 2
- 238000003848 UV Light-Curing Methods 0.000 description 2
- 238000003491 array Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005674 electromagnetic induction Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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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
- G02F1/1333—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
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1345—Conductors connecting electrodes to cell terminals
- G02F1/13452—Conductors connecting driver circuitry and terminals of 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
- G02F1/137—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
- G02F1/13718—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 a change of the texture state of a cholesteric liquid crystal
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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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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
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- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- General Engineering & Computer Science (AREA)
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Abstract
The invention belongs to the technical field of liquid crystal display application, in particular to a transparent partial erasing liquid crystal film handwriting board, which comprises a transparent piezoelectric film and a sealing terminal; the liquid crystal layer, the front conductive layer and the rear conductive layer are arranged between the two layers of substrates; conductive blocks are distributed on the surface of the rear conductive layer in an mutually insulating manner, and the conductive blocks are independently controlled to be electrified through FPC flat cables and a circuit board; the transparent piezoelectric film and the rear conductive layer are distributed in a grid shape, the surface of the transparent piezoelectric film is distributed with blocks, the blocks of the rear conductive layer are in one-to-one correspondence with the blocks of the transparent piezoelectric film, and the control relationship between each block of the transparent piezoelectric film and the conductive block of the rear conductive layer is adjustably set to be one-to-one or one-to-many. In the invention, when the part is erased, the part erasing regulating switch can be stirred, the area of the erasing area is freely selected under the single erasing period, the whole surface erasing of the handwriting board is not required, the situation that the part is erased is avoided, the single erasing area is small, the erasing efficiency is low, and the ink points are easy to remain is avoided.
Description
Technical Field
The invention belongs to the technical field of liquid crystal display application, and particularly relates to a transparent partial erasing liquid crystal film handwriting board.
Background
The liquid crystal writing board is generally based on bistable property of cholesteric liquid crystal, and the display or erasure of the contents on the writing board is realized through different states of the cholesteric liquid crystal under the external influence. The cholesteric liquid crystal molecules are flat and are in lamellar arrangement, molecules in the layers are parallel to each other, the long axes of the molecules are parallel to the layer plane, the long axes of the molecules of different layers are slightly changed, and the cholesteric liquid crystal molecules are arranged in a spiral structure along the normal direction of the layers. Generally, the pitch of the cholesteric liquid crystal changes with temperature, applied electric field, magnetic field, pressure, etc., and the change of the pitch corresponds to different structural states of the cholesteric liquid crystal, so that the cholesteric liquid crystal presents different display states.
In the prior art, the writing of the cholesteric liquid crystal handwriting board is generally achieved through the pressure of the handwriting pen on a liquid crystal surface, and under the condition of no power supply, the track of the handwriting pen is presented by changing the liquid crystal state through the pressure acted on the liquid crystal handwriting board, so that the cholesteric liquid crystal in the writing area presents a planar structure, has a selective reflection effect on visible light, and further displays corresponding writing contents; the handwriting on the liquid crystal handwriting board is erased by forming an electric field between two parallel conductive polar plates under the condition of electrifying, and the pitch of cholesteric liquid crystal is changed under the action of the electric field, so that the cholesteric liquid crystal is changed from a planar structure to a focal conic structure, the trace of the original writing area is disappeared, and the handwriting of the whole liquid crystal handwriting board is erased.
In the prior art, the method for realizing the local erasing of the liquid crystal handwriting board is commonly as follows: by means of adding magnetic field between the eraser (blackboard eraser) and the liquid crystal handwriting board, as disclosed in 2021103570702 patent, coil arrays are respectively arranged inside the blackboard eraser and the liquid crystal handwriting board, and writing marks in the blackboard eraser passing area are erased by electromagnetic induction;
in some cases, the writing is erased by means of local heating, as disclosed in the patent with application number 2023106111346, and the erasing of the corresponding area is achieved by a heating plate;
in some cases, the local erasure is performed by ultrasonic waves, as disclosed in patent application No. 2018110522275.
However, the above patent has a problem that the erasing area is uncontrollable when the local erasing is realized, no matter the erasing area is controlled by the size of the blackboard eraser when the blackboard eraser is used for erasing, or the ultrasonic wave transmitting component and the heating component are used for controlling the size of the ultrasonic wave transmitting component and the heating component, the width of the erasing area cannot be freely selected in a single erasing period (namely, an erasing trace of the erasing component on the liquid crystal handwriting board), and the erasing area cannot be conveniently erased to select smaller areas (such as written punctuation, single strokes and the like) when the blackboard eraser is used for large-area erasing under the condition that the whole handwriting board is not required to be erased; when the large-area is erased by the small ultrasonic wave transmitting component and the heating component, the large-area is required to be erased for multiple times, the erasing efficiency is low, part of writing marks are easy to miss, ink points are left, and the incomplete erasing condition occurs.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a transparent partial erasing liquid crystal film handwriting board, and aims to solve the technical problem of low recovery efficiency of electronic products in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions: the liquid crystal film handwriting board is used for writing handwriting through a handwriting pen, and comprises a substrate, a front conductive layer, a rear conductive layer, a liquid crystal layer, a transparent piezoelectric film and a sealing terminal, wherein the front conductive layer and the rear conductive layer are parallel to each other;
the substrate is made of transparent materials, is generally preferably a PET film, at least comprises two layers, namely a top layer and a bottom layer, is soft in material, can be cut freely, can be filled with cholesteric liquid crystal freely between the two layers, and is subjected to UV curing; the liquid crystal layer, the front conductive layer and the rear conductive layer are arranged between the two layers of substrates;
a circuit board is arranged in the sealing terminal, and the circuit board is connected with the liquid crystal film handwriting board through FPC flat cable in a power supply way;
the rear conductive layer is distributed in a grid shape, a plurality of conductive blocks are distributed in the transverse direction and the longitudinal direction of the rear conductive layer in an mutually insulating manner, and each conductive block is independently controlled to be electrified with the circuit board through an FPC (flexible printed circuit) flat cable; the FPC flat cables are at least arranged into two groups, one group of the FPC flat cables connects the rear conductive layer with the circuit board, and the other group of the FPC flat cables connects the transparent piezoelectric film with the circuit board;
the circuit board assembly and the serial port assembly are arranged on the side edges, the circuit wiring of the handwriting board is used, the transparency of the handwriting board is not affected, handwriting display of the handwriting board is not affected, the FPC flat cable is used as a high-speed signal wire, and switching control signals of the rear conductive layer and piezoelectric signals of the transparent piezoelectric film can be transmitted to the circuit board respectively, so that the signal is stable.
The circuit board is provided with a serial interface, and the conducting blocks of the rear conducting layer are all electrified by communication control through an RS-485 bus;
in the rear conducting layer, conducting blocks of the rear conducting layer are arranged in Q rows and P columns, one switch control is correspondingly arranged on each conducting block in each row and each column, P conducting blocks in each row are controlled through a bus A of an RS-485 bus and one switch, and Q conducting blocks in each column are controlled through a bus B of the RS-485 bus and one switch.
The RS-485 bus is half duplex communication, so that two buses are needed to carry out communication control on the conducting blocks of the rear conducting layer, each row and each column of the conducting blocks are provided with a unique switch, all the switches are in a normally open state, one conducting block which can correspondingly shift is formed through the corresponding row and column to form a unique address code, address distribution software is programmed on the circuit board, a group of closed row and column switches can correspond to the unique one conducting block, an electric field is formed between the conducting block and the front conducting layer, and handwriting on a liquid crystal layer corresponding to the electrified conducting block can be eliminated.
The transparent piezoelectric film is arranged to be a transparent flexible PZT piezoelectric film, the transparent piezoelectric film is arranged between the front conducting layer and the substrate, the transparent piezoelectric film is also distributed in a grid shape, the transparent piezoelectric film is transversely and longitudinally distributed with a plurality of blocks in an mutually insulating manner, the conducting blocks of the rear conducting layer are in one-to-one correspondence with the blocks of the transparent piezoelectric film, and the control relationship between each block of the transparent piezoelectric film and the conducting block of the rear conducting layer is adjustably set to be one-to-one or one-to-many;
in the transparent piezoelectric film, the transparent piezoelectric film is also distributed into Q rows and P columns in a grid mode, each block is mutually insulated and independently controlled, piezoelectric signals are transmitted to switches of corresponding rows and columns of the rear conductive layer through two paths of signals in the transverse direction and the longitudinal direction, and the switches are controlled to be closed.
When handwriting is erased on the handwriting board through the transparent piezoelectric film blocks corresponding to the conducting blocks of the rear conducting layer one by one, the transparent piezoelectric film in the corresponding area can generate piezoelectric signals under pressure, the piezoelectric signals correspond to the conducting blocks of the rear conducting layer, the circuit board controls the switch of the conducting blocks in the corresponding row and column to be closed, or controls a plurality of switches around the conducting blocks in the corresponding row and column to be closed, an electric field is generated, and handwriting is erased.
Likewise, the transparent piezoelectric film may also be disposed between the rear conductive layer and the substrate;
on the integral switch setting of the handwriting board, the surface of the sealing terminal is provided with an integral erasing switch and a partial erasing switch, the integral erasing switch controls the switch of all rows and columns of the rear conductive layer to be closed, and the partial erasing switch controls the signal access of the transparent piezoelectric film and the rear conductive layer; and a partial erasure adjusting switch is also arranged for adjusting the corresponding control relation between each block of the transparent piezoelectric film and the conductive block of the rear conductive layer.
When all areas of the handwriting board need to be erased integrally, the integral erasing switch is closed, and all the switches of the rows and the columns of the rear conductive layer are closed, so that the rear conductive layer is electrified integrally, an electric field is formed between the liquid crystal layers of the whole handwriting board, and handwriting erasing is carried out on the whole handwriting board; when only partial erasing is needed, the partial erasing switch is closed, the first-file erasing is defaulted, and the erasing area is minimum, namely, each block of the transparent piezoelectric film is in one-to-one control correspondence with the conducting block of the rear conducting layer, so that the writing punctuation, single strokes and other fine parts can be erased; after the adjusting switch is erased by the poking part, the erasing area is gradually increased, and single erasure of a larger area can be performed, so that the erasure efficiency is improved, and the whole handwriting board is not required to be erased.
The method is characterized in that the partial erasing regulating switch is provided with a plurality of gears, each gear is added on a basic gear, one block of the transparent piezoelectric film corresponds to the row and column number of the switch of the closed rear conductive layer, namely, under the basic gear, the transparent piezoelectric film block of M rows and N columns corresponds to the switch row of the rear conductive layer as the sole conductive block of M rows and N columns, the basic gear is added with one, the transparent piezoelectric film block of M rows and N columns corresponds to the 9 conductive blocks of the rear conductive layer, and the number of the switch rows of the transparent piezoelectric film block of M rows and N columns is (M-1) to (M+1) and the number of the columns of the 9 conductive blocks of (N-1) to (N+1).
According to the control method, the erasing area is increased by stirring the part erasing adjusting switch, the erasing area is increased by 9, 25 and 49 … times on the basis of the basic gear, the erasing component with larger size is not required to be replaced, and the handwriting of the larger area can be erased without the whole handwriting board.
According to the specific erasing method of the handwriting board product, handwriting of the liquid crystal film handwriting board can be erased through a handwriting pen or other soft objects.
Compared with the prior art, the invention has the beneficial effects that:
1. in the prior art, when the local erasing is realized, the erasing area is uncontrollable, no matter the erasing area is controlled by the size of the blackboard eraser when the blackboard eraser is used for erasing, or the ultrasonic wave transmitting assembly and the heating assembly are used for controlling the size of the ultrasonic wave transmitting assembly and the heating assembly, the single erasing period (namely, an erasing trace of the erasing assembly on the liquid crystal handwriting board) cannot be freely selected, and the width of the erasing area is not convenient to erase and select smaller areas (such as written punctuation, single strokes and the like) when the blackboard eraser is used for large-area erasing under the condition that the whole handwriting board is not needed to erase; when the small ultrasonic wave transmitting component and the heating component are used for erasing, the large area is erased, the erasing efficiency is low, partial writing marks are easy to miss, ink points are easy to leave, and the incomplete erasing is caused.
2. In the invention, communication of the rear conducting layer is carried out through the RS-485 bus, each conducting block can be electrified independently according to the matched address code, and the transparent piezoelectric film block transmits piezoelectric signals according to the erasing pressure on the surface of the handwriting board, so that the corresponding conducting block of the rear conducting layer is electrified to erase the handwriting of the liquid crystal layer, and the control relation between the transparent piezoelectric film block and the conducting block of the rear conducting layer can be adjusted to be one-to-one or one-to-many, thereby realizing the adjustment of the width of a single erasing area and the improvement of the erasing efficiency.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 is an exploded view of a liquid crystal film handwriting board according to the invention;
FIG. 2 is a cross-sectional view of a liquid crystal film handwriting board in the invention;
FIG. 3 is a schematic diagram of the power-up of the conductive block of the conductive layer after serial port control in the present invention;
fig. 4 is a schematic diagram of a corresponding control relationship between each block of the transparent piezoelectric film and the conductive block of the rear conductive layer under the three-gear adjustment.
Reference numerals:
in the figure, 1, a substrate; 2. a front conductive layer; 3. a rear conductive layer; 4. a liquid crystal layer; 5. a transparent piezoelectric film; 6. FPC flat cable; 7. and sealing the terminal.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Under the prior art, the writing of the cholesteric liquid crystal handwriting board is generally achieved through the pressure of the handwriting pen on a liquid crystal surface, and under the condition that the handwriting board is not electrified, the track of the handwriting pen is presented through changing the liquid crystal state through the pressure acted on the liquid crystal handwriting board, so that the cholesteric liquid crystal in the writing area presents a planar structure, has a selective reflection effect on visible light, and further displays corresponding writing contents; the handwriting on the liquid crystal handwriting board is erased by forming an electric field between two parallel conductive polar plates under the condition of electrifying, and the pitch of cholesteric liquid crystal is changed under the action of the electric field, so that the cholesteric liquid crystal is changed from a planar structure to a focal conic structure, the trace of the original writing area is disappeared, and the handwriting of the whole liquid crystal handwriting board is erased.
In the prior art, the method for realizing the local erasing of the liquid crystal handwriting board is commonly as follows: the method comprises the steps that a magnetic field is added between an eraser and a liquid crystal handwriting board, coil arrays are respectively arranged in the eraser and the liquid crystal handwriting board, and writing marks in an eraser passing area are erased through electromagnetic induction; in some cases, the writing is erased by local heating, and the corresponding area can be erased by a heating plate; in some cases, the local erasure is performed by ultrasonic waves.
However, in either erase method, the width of the single erase region is always not adjustable.
Examples:
in this embodiment, referring to fig. 1-2, a transparent partial erasing liquid crystal film writing pad which performs writing by a stylus pen, the liquid crystal film writing pad includes a substrate 1, a front conductive layer 2 and a rear conductive layer 3 parallel to each other, and a liquid crystal layer 4, the liquid crystal layer 4 includes a cholesteric liquid crystal material, the liquid crystal layer 4 is located between the front conductive layer 2 and the rear conductive layer 3, and further includes a transparent piezoelectric film 5 and a sealing terminal 7;
the substrate 1 is made of transparent material, preferably a PET film, and in this embodiment, the substrate 1 includes two layers, a top layer and a bottom layer, the material is soft, and can be cut freely, cholesteric liquid crystal can be filled between the two layers freely, and UV curing is performed;
the liquid crystal layer 4, the front conductive layer 2 and the rear conductive layer 3 are arranged between the two layers of substrates 1;
a circuit board is arranged in the sealing terminal 7, and is connected with a liquid crystal film handwriting board through an FPC flat cable 6 in a power supply manner;
the rear conductive layer 3 is distributed in a grid shape, a plurality of conductive blocks are distributed on the rear conductive layer 3 in a transverse direction and a longitudinal direction in an mutually insulating manner, and each conductive block is independently controlled to be electrified with the circuit board through the FPC flat cable 6; in this embodiment, the individual conducting areas are uniformly sized; in other embodiments, the conducting areas are divided into conducting areas with irregular grid shapes, and only the conducting areas of the rear conducting layer 3 and the conducting areas of the transparent piezoelectric film 5 are required to be guaranteed to be in one-to-one correspondence, so that the person skilled in the art can also realize corresponding designs for the conducting areas with different division forms according to the design thought of the embodiment.
In the present embodiment, the FPC cables 6 are provided in two groups, one group of FPC cables 6 connects the rear conductive layer 3 with the circuit board, and one group of FPC cables 6 connects the transparent piezoelectric film 5 with the circuit board;
in another embodiment, the FPC cables 6 may be arranged in three groups, and the second FPC cable 6 may be connected to the front conductive layer 2, so as to control the voltage of the front conductive layer 2, and only the voltage difference between the front conductive layer 2 and the rear conductive layer 3 is ensured to be greater than the erase start voltage of the liquid crystal layer 4, so that the voltage difference can be smaller than the breakdown voltage.
In this embodiment, the circuit board assembly and the serial port assembly are arranged on the sides, so that the circuit wiring of the handwriting board is not affected, the transparency of the handwriting board is not affected, the handwriting display of the handwriting board is not affected, the FPC flat cable 6 is used as a high-speed signal line, and the switch control signal of the rear conductive layer 3 and the piezoelectric signal of the transparent piezoelectric film 5 can be transmitted to the circuit board respectively, so that the signal is stable.
The circuit board is provided with a serial interface, and the conducting blocks of the rear conducting layer 3 are all controlled to be electrified through communication of an RS-485 bus;
referring to fig. 3, in the rear conductive layer 3, the conductive blocks of the rear conductive layer 3 are arranged in Q rows and P columns, each row and each column of conductive blocks is correspondingly provided with one switch control, the P conductive blocks of each row are controlled by a bus a of the RS-485 bus and one switch, and the Q conductive blocks of each column are controlled by a bus B of the RS-485 bus and one switch.
In this embodiment, the design of the switches of the rows and columns of the conducting blocks can have various mature design methods, such as a switching mode of using an MCU to control the relay, or using a triode as a switch, and can simply implement the free control of each switch of each row and each column.
The RS-485 bus is half duplex communication, so that two buses are required to perform communication control on the conductive blocks of the rear conductive layer 3, each row and each column of the conductive blocks are provided with a unique switch, all the switches are in a normally open state, one conductive block which can correspondingly shift is formed through the corresponding row and column to form a unique address code, address allocation software is programmed on the circuit board, a group of closed row and column switches can correspond to the unique one conductive block, an electric field is formed between the conductive block and the front conductive layer 2, and handwriting on the liquid crystal layer 4 corresponding to the conductive block which is electrified can be eliminated.
On the arrangement of the transparent piezoelectric film 5, the transparent piezoelectric film 5 is arranged as a transparent flexible PZT piezoelectric film, the transparent piezoelectric film 5 is arranged between the front conductive layer 2 and the substrate 1, the transparent piezoelectric film 5 is also distributed in a grid shape, the transparent piezoelectric film 5 is transversely and longitudinally distributed with a plurality of blocks in an mutually insulating manner, the conductive blocks of the rear conductive layer 3 are in one-to-one correspondence with the blocks of the transparent piezoelectric film 5, and the control relationship between each block of the transparent piezoelectric film 5 and the conductive block of the rear conductive layer 3 is adjustably arranged to be one-to-one or one-to-many;
in the transparent piezoelectric film 5, the transparent piezoelectric film 5 is also distributed into Q rows and P columns in a grid shape, each block is mutually insulated and independently controlled, piezoelectric signals are transmitted to switches of corresponding rows and columns of the rear conductive layer 3 through two paths of signals in the transverse direction and the longitudinal direction, and the switches are controlled to be closed; in this embodiment, the piezoelectric signals of the transparent piezoelectric film 5 generally need to be subjected to voltage boosting and voltage stabilizing control, which can be freely configured according to different handwriting boards and different piezoelectric films, which is feasible, simple and easy to operate for a person skilled in the art, and only needs to ensure that the switches of the conductive blocks of the corresponding rows and columns of the rear conductive layer 3 are triggered to be closed by high level.
When handwriting is erased on the handwriting board through the transparent piezoelectric film 5 blocks corresponding to the conducting blocks of the rear conducting layer 3 one by one, the transparent piezoelectric film 5 in the corresponding area can generate piezoelectric signals under pressure, the piezoelectric signals correspond to the conducting blocks of the rear conducting layer 3, the circuit board controls the switch of the conducting blocks in the corresponding row and column to be closed, or controls a plurality of switches around the conducting blocks in the corresponding row and column to be closed, and an electric field is generated to erase the handwriting.
In another embodiment, the transparent piezoelectric film 5 may also be disposed between the rear conductive layer 3 and the substrate 1, and in general, the transparent piezoelectric film 5 is preferably disposed between the rear conductive layer 3 and the substrate 1, which does not affect the sensitivity of handwriting of the handwriting pad.
On the whole switch setting of the handwriting board, the surface of the sealing terminal 7 is provided with a whole erasing switch and a partial erasing switch, the whole erasing switch controls the closing of all the switches of the rows and the columns of the rear conductive layer 3, and the partial erasing switch controls the signal access of the transparent piezoelectric film 5 and the rear conductive layer 3; a partial erase adjustment switch is also provided for adjusting the corresponding control relationship of each block of the transparent piezoelectric film 5 with the conductive block of the rear conductive layer 3.
When all areas of the handwriting board need to be erased integrally, the integral erasing switch is closed, and all the switches of the rows and the columns of the rear conductive layer 3 are closed, so that the rear conductive layer 3 is electrified integrally, an electric field is formed between the liquid crystal layers 4 of the whole handwriting board, and handwriting erasing is carried out on the whole handwriting board; when only partial erasing is needed, the partial erasing switch is closed, the first-grade erasing is defaulted, and the erasing area is minimum, namely, each block of the transparent piezoelectric film 5 is in one-to-one control correspondence with the conductive block of the rear conductive layer 3, so that the writing punctuation, single strokes and other fine parts can be erased; after the adjusting switch is erased by the poking part, the erasing area is gradually increased, and single erasure of a larger area can be performed, so that the erasure efficiency is improved, and the whole handwriting board is not required to be erased.
Referring to fig. 4, in a specific control method, a part of erasing adjusting switch is provided with multiple gears, each gear is added to a basic gear of the part of erasing adjusting switch, one block of the transparent piezoelectric film 5 corresponds to the row and column number of the switch of the closed rear conductive layer 3, namely, in the basic gear, the switch row of the rear conductive layer 3 corresponding to the block of the transparent piezoelectric film 5 with M rows and N columns is the sole conductive block with M rows and N columns, one basic gear is added, the number of the switch rows of the rear conductive layer 3 corresponding to the block of the transparent piezoelectric film 5 with M rows and N columns is M-1 to m+1, and the number of the switch rows of the rear conductive layer 3 is 9 conductive blocks with N-1 to n+1.
According to the control method, the erasing area is increased by stirring the part erasing adjusting switch, the erasing area is increased by 9, 25 and 49 … times on the basis of the basic gear, the erasing component with larger size is not required to be replaced, and the handwriting of the larger area can be erased without the whole handwriting board.
Namely, in the basic gear, namely in the first gear, namely in the default gear, the transparent piezoelectric film 5 blocks of 3 rows and 3 columns correspond to the conducting blocks of 3 rows and 3 columns of the switch rows of the rear conducting layer 3; under the second gear, 3 rows and 3 columns of transparent piezoelectric film 5 blocks correspond to 9 conducting blocks with the switching row number of 2-4 and the column number of 2-4 of the rear conducting layer 3; under the three-gear shift, the transparent piezoelectric film 5 blocks in 3 rows and 3 columns correspond to 25 conducting blocks with the switching row number of 1-5 and the column number of 1-5 of the rear conducting layer 3; in this embodiment, the gear is only designed as 3 gears, so that handwriting erasing in most cases can be satisfied.
In the specific erasing method of the handwriting board product, handwriting of the liquid crystal film handwriting board can be erased by a handwriting pen or other soft objects.
Therefore, in this embodiment, the two modes of overall erasure and partial erasure are adopted, so that the two requirements of overall erasure and partial erasure can be met, and meanwhile, in the partial erasure mode, the partial erasure adjusting switch can be toggled, the area of the erasure area is freely selected in a single erasure period, the whole erasure of the handwriting board is not required, the useful information on the handwriting board is erased by mistake, and the situations that the erasure efficiency is low and ink dots are easy to remain due to the fact that the single erasure area is too small in the partial erasure are avoided.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The liquid crystal film handwriting board is erased in transparent part, handwriting is carried out through handwriting pen to this liquid crystal film handwriting board, and this liquid crystal film handwriting board includes base plate (1), preceding conducting layer (2) and back conducting layer (3) that are parallel to each other to and liquid crystal layer (4), liquid crystal layer (4) include cholesteric liquid crystal material, liquid crystal layer (4) are located between preceding conducting layer (2) and back conducting layer (3), its characterized in that: the piezoelectric ceramic also comprises a transparent piezoelectric film (5) and a sealing terminal (7);
the substrate (1) is made of transparent materials and at least comprises two layers, and the liquid crystal layer (4), the front conductive layer (2) and the rear conductive layer (3) are arranged between the two layers of the substrate (1);
a circuit board is arranged in the sealing terminal (7), and the circuit board is connected with the liquid crystal film handwriting board through an FPC flat cable (6) in a power supply manner;
the rear conductive layer (3) is distributed in a grid shape, a plurality of conductive blocks are distributed in the transverse direction and the longitudinal direction of the rear conductive layer (3) in an mutually insulating manner, and each conductive block is independently controlled to be electrified with the circuit board through the FPC flat cable (6);
the transparent piezoelectric film (5) is arranged between the front conductive layer (2) and the substrate (1), the transparent piezoelectric film (5) is also distributed in a grid shape, the transparent piezoelectric film (5) is transversely and longitudinally distributed with a plurality of blocks in mutual insulation, the conductive blocks of the rear conductive layer (3) are in one-to-one correspondence with the blocks of the transparent piezoelectric film (5), and the control relationship between each block of the transparent piezoelectric film (5) and the conductive block of the rear conductive layer (3) is adjustably set to be one-to-one or one-to-many.
2. The liquid crystal film writing pad of claim 1, wherein: the circuit board is provided with a serial interface, and the conducting blocks of the rear conducting layer (3) are all electrified through communication control of an RS-485 bus.
3. The liquid crystal film writing pad of claim 2, wherein: the conducting blocks of the rear conducting layer (3) are arranged in Q rows and P columns, one switch control is correspondingly arranged on each conducting block in each row and each column, P conducting blocks in each row are controlled through a bus A of an RS-485 bus and one switch, and Q conducting blocks in each column are controlled through a bus B of the RS-485 bus and one switch.
4. A liquid crystal film writing pad according to claim 3, wherein: the FPC winding displacement (6) is at least arranged into two groups, one group of FPC winding displacement (6) is used for connecting the rear conductive layer (3) with the circuit board, and the other group of FPC winding displacement (6) is used for connecting the transparent piezoelectric film (5) with the circuit board.
5. The liquid crystal film writing pad of claim 4, wherein: the transparent piezoelectric film (5) is also distributed into Q rows and P columns in a grid mode, each block is mutually insulated and independently controlled, piezoelectric signals are transmitted to the switches of the corresponding rows and columns of the rear conductive layer (3) through two paths of signals in the transverse direction and the longitudinal direction, and the switches are controlled to be closed.
6. The liquid crystal film writing pad of claim 5, wherein: the surface of the sealing terminal (7) is provided with an integral erasing switch and a partial erasing switch, the integral erasing switch controls all the switches of the rows and the columns of the rear conductive layer (3) to be closed, and the partial erasing switch controls the signal access of the transparent piezoelectric film (5) and the rear conductive layer (3).
7. The liquid crystal film writing pad of claim 6, wherein: the surface of the sealing terminal (7) is also provided with a part of erasing adjusting switch which is used for adjusting the corresponding control relation between each block of the transparent piezoelectric film (5) and the conductive block of the rear conductive layer (3).
8. The liquid crystal film writing pad of claim 7, wherein: the part erasure adjusting switch is provided with a plurality of gears, each gear is added on a basic gear, one block of the transparent piezoelectric film (5) corresponds to the row and column number of the switch of the closed rear conductive layer (3), namely under the basic gear, the block of the transparent piezoelectric film (5) of M rows and N columns corresponds to the switch row of the rear conductive layer (3) as the sole conductive block of M rows and N columns, one basic gear is added, the block of the transparent piezoelectric film (5) of M rows and N columns corresponds to the 9 conductive blocks of the rear conductive layer (3) with the switch row numbers of (M-1) to (M+1) and the column numbers of (N-1) to (N+1).
9. The liquid crystal film writing pad of claim 1, wherein: the transparent piezoelectric film (5) is arranged as a transparent flexible PZT piezoelectric film.
10. The liquid crystal film writing pad of claim 1, wherein: the transparent piezoelectric film (5) can also be arranged between the rear conductive layer (3) and the substrate (1).
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120127136A1 (en) * | 2010-08-18 | 2012-05-24 | Kent Displays Incorporated | Display device including piezoelectric and liquid crystal layers |
| CN108828821A (en) * | 2018-06-28 | 2018-11-16 | 广州林登科技有限公司 | It is a kind of can selective erase liquid crystal writing device and selective erase method |
| CN109597259A (en) * | 2019-01-30 | 2019-04-09 | 深圳市恒开源电子有限公司 | Can selective erase liquid crystal handwriting pad and erasing apparatus |
| US20200142581A1 (en) * | 2018-05-30 | 2020-05-07 | Shandong Lanbeisite Educational Equipment Group | Liquid crystal writing film, partial erasing method, multi-voltage output circuit and positioning system capable of partial erasing |
| CN111781754A (en) * | 2019-04-03 | 2020-10-16 | 江苏集萃智能液晶科技有限公司 | Liquid crystal handwriting board capable of being partially erased |
| CN211827223U (en) * | 2020-04-10 | 2020-10-30 | 袁忐英 | Liquid crystal writing pad |
| CN112987366A (en) * | 2021-02-04 | 2021-06-18 | 业成科技（成都）有限公司 | Electronic handwriting board and application method thereof and terminal equipment |
| 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 |
-
2023
- 2023-11-09 CN CN202311491549.0A patent/CN117590633B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120127136A1 (en) * | 2010-08-18 | 2012-05-24 | Kent Displays Incorporated | Display device including piezoelectric and liquid crystal layers |
| US20200142581A1 (en) * | 2018-05-30 | 2020-05-07 | Shandong Lanbeisite Educational Equipment Group | Liquid crystal writing film, partial erasing method, multi-voltage output circuit and positioning system capable of partial erasing |
| CN108828821A (en) * | 2018-06-28 | 2018-11-16 | 广州林登科技有限公司 | It is a kind of can selective erase liquid crystal writing device and selective erase method |
| CN109597259A (en) * | 2019-01-30 | 2019-04-09 | 深圳市恒开源电子有限公司 | Can selective erase liquid crystal handwriting pad and erasing apparatus |
| CN111781754A (en) * | 2019-04-03 | 2020-10-16 | 江苏集萃智能液晶科技有限公司 | Liquid crystal handwriting board capable of being partially erased |
| CN211827223U (en) * | 2020-04-10 | 2020-10-30 | 袁忐英 | Liquid crystal writing pad |
| CN112987366A (en) * | 2021-02-04 | 2021-06-18 | 业成科技（成都）有限公司 | Electronic handwriting board and application method thereof and terminal equipment |
| 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 |
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