CN110147006B - Voltage application system and method for realizing local erasing of liquid crystal writing board, liquid crystal writing film, writing board, blackboard and drawing board - Google Patents
Voltage application system and method for realizing local erasing of liquid crystal writing board, liquid crystal writing film, writing board, blackboard and drawing board Download PDFInfo
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- CN110147006B CN110147006B CN201811455640.6A CN201811455640A CN110147006B CN 110147006 B CN110147006 B CN 110147006B CN 201811455640 A CN201811455640 A CN 201811455640A CN 110147006 B CN110147006 B CN 110147006B
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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
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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
- G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
Abstract
The invention discloses a voltage application system and method for realizing local erasing of a liquid crystal writing board, a liquid crystal writing film, the writing board, a blackboard and a drawing board, wherein a liquid crystal layer is positioned between two conducting layers, and the two conducting layers are respectively divided into two or more conducting regions; the process is as follows: applying a first voltage to a conductive region of the first conductive layer overlying the partially erased area; applying zero voltage to a conductive region of the second conductive layer overlying the partially erased area; the rest conductive regions are in a high-resistance state; after the set time, applying zero voltage to the conductive area of the first conductive layer covering the local erasing area; applying a first voltage to a conductive region of the second conductive layer overlying the partially erased area; the remaining conductive region is in a high resistance state. The invention has the beneficial effects that: when the single block area is erased, only three output modes of erasing voltage, zero voltage and high resistance state are required to be provided, and the complexity of a voltage output circuit is greatly reduced. The two diagonally connected areas can be simultaneously erased, and the problem of quick erasing in the oblique line direction is solved.
Description
Technical Field
The invention relates to the technical field of liquid crystal writing boards, in particular to a voltage applying system and method for realizing local erasing of a liquid crystal writing board, a liquid crystal writing film, a writing board, a blackboard and a drawing board.
Background
The liquid crystal writing board on the market at present has the working principle that the bistable characteristic of liquid crystal is utilized to display and/or erase the writing content on the liquid crystal writing board. For example, the cholesteric liquid crystal is used as a writing film, the writing pressure trace of a writing pen is recorded by the pressure acting on a liquid crystal writing board, and the corresponding writing content is displayed; the cholesteric liquid crystal structure is changed by applying an electric field, so that the writing pressure track on the liquid crystal writing board disappears to realize erasing.
In the method for controlling the local erasing voltage of the writing board disclosed by the prior art, the conductive layer is divided into a plurality of conductive areas, and different voltages are applied to each conductive area to achieve the purpose of local erasing; the method needs to apply erasing voltage or zero voltage to the conductive area where the area to be erased is located, and also needs to realize local erasing by one or more auxiliary voltages, each conductive area needs to apply voltage, the manufacturing and using cost of the writing board is greatly increased, and meanwhile, after erasing is finished, rewriting can be realized only by delaying a certain time.
The erasing by increasing the auxiliary voltage may affect the display of the writing in the peripheral area, and the simultaneous erasing of two diagonally adjacent areas cannot be realized.
Disclosure of Invention
The present disclosure is directed to solve the above problems, and provides a voltage application system and method, a liquid crystal writing film, a writing board, a blackboard, and a drawing board for implementing local erasing of a liquid crystal writing board, which can implement local erasing of a single region, and can implement simultaneous erasing of two local regions diagonally adjacent to each other without affecting writing display in a peripheral region.
In order to achieve the purpose, the invention adopts the following technical scheme:
disclosed in one or more embodiments is a voltage application system for realizing partial erasure of a liquid crystal writing board, including: the liquid crystal writing film comprises a first conducting layer, a second conducting layer and a liquid crystal layer positioned between the two conducting layers; the two conductive layers are respectively divided into two or more conductive areas; applying a first voltage to a conductive region of the first conductive layer overlying the partially erased area; applying a second voltage to a conductive region of the second conductive layer overlying the partially erased area; the rest conductive regions are in a high-resistance state; the first voltage and the second voltage form an erasing electric field at the overlapped position of the two conductive areas to realize local erasing.
Further, the conductive region is connected to a multi-voltage output circuit capable of applying a first voltage, a second voltage, or a high resistance state to the conductive region as necessary.
Further, the first voltage is at least larger than the voltage required for completely erasing the handwriting, and the second voltage is zero voltage.
Applying a first voltage to a conductive region of the first conductive layer overlying the partially erased area; applying zero voltage to a conductive region of the second conductive layer overlying the partially erased area; the rest conductive regions are in a high-resistance state;
after the set time, applying zero voltage to the conductive area of the first conductive layer covering the local erasing area; applying a first voltage to a conductive region of the second conductive layer overlying the partially erased area; the remaining conductive region is in a high resistance state.
The first voltage and the zero voltage form an erasing electric field at the overlapped position of the two conductive areas to realize local erasing. Compared with the existing local erasing voltage application method, the state of the applied voltage only comprises the following steps: the first voltage, the zero voltage and the high resistance state are realized, the auxiliary voltage is not needed, and the cost is saved; voltage does not need to be applied to each conductive area, so that the writing delay phenomenon caused by applying erasing voltage is improved; and the handwriting display of the peripheral area is not influenced.
In one or more embodiments, disclosed is a voltage application method for realizing partial erasing of a liquid crystal writing board, wherein a liquid crystal layer is positioned between two conductive layers, and the two conductive layers are respectively divided into two or more conductive regions; it is characterized in that the process is as follows:
applying a first voltage to a conductive region of the first conductive layer overlying the partially erased area; applying a second voltage to a conductive region of the second conductive layer overlying the partially erased area; the rest conductive regions are in a high-resistance state; the first voltage and the second voltage form an erasing electric field at the overlapped position of the two conductive areas to realize local erasing.
Disclosed in one or more embodiments is a voltage application system for realizing partial erasure of a liquid crystal writing board, including: the liquid crystal writing film comprises two conducting layers and a liquid crystal layer positioned between the two conducting layers; the two conductive layers are respectively divided into two or more conductive areas; applying a first voltage to a conductive region of a first conductive layer overlying a first local erase region; applying a second voltage to a conductive region of the second conductive layer overlying the first local erase region; applying a second voltage to a conductive region of the first conductive layer overlying the second partially erased area; applying a first voltage to a conductive region of the second conductive layer overlying the second partially erased area; the rest conductive regions are in a high-resistance state; the first and second partially erased areas are diagonally adjacent;
the first voltage and the second voltage form an erasing electric field at the position where the conductive areas on the two conductive layers are overlapped, and local erasing of the diagonally adjacent areas is realized.
Further, the conductive region is connected to a multi-voltage output circuit capable of applying a first voltage, a second voltage, or a high resistance state to the conductive region as necessary.
Further, the first voltage is at least larger than the voltage required for completely erasing the handwriting, and the second voltage is zero voltage.
Applying a first voltage to a conductive region of a first conductive layer overlying a first local erase region; applying a zero voltage to a conductive region of the second conductive layer overlying the first local erase region; applying zero voltage to the conductive region of the first conductive layer overlying the second partially erased area; applying a first voltage to a conductive region of the second conductive layer overlying the second partially erased area; the rest conductive regions are in a high-resistance state; the first and second partially erased areas are diagonally adjacent;
after a set time, applying zero voltage to the conductive region of the first conductive layer covering the first local erase region; applying a first voltage to a conductive region of the second conductive layer overlying the first local erase region; applying a first voltage to a conductive region of the first conductive layer overlying the second partially erased area; applying zero voltage to a conductive region of the second conductive layer overlying the second partially erased area; the remaining conductive region is in a high resistance state.
The first voltage and the zero voltage form an erasing electric field at the overlapped position of the two conductive areas to realize local erasing. The method can simultaneously erase two diagonally adjacent areas, and solves the problem that the two diagonally adjacent areas cannot be directly erased in the diagonal direction.
In one or more embodiments, disclosed is a voltage application method for realizing partial erasing of a liquid crystal writing board, wherein a liquid crystal writing film is positioned between two conductive layers, and the two conductive layers are respectively divided into two or more conductive regions; the process is as follows:
applying a first voltage to a conductive region of a first conductive layer overlying a first local erase region; applying a second voltage to a conductive region of the second conductive layer overlying the first local erase region; applying a second voltage to a conductive region of the first conductive layer overlying the second partially erased area; applying a first voltage to a conductive region of the second conductive layer overlying the second partially erased area; the rest conductive regions are in a high-resistance state; the first and second partially erased areas are diagonally adjacent;
the first voltage and the second voltage form an erasing electric field at the position where the conductive areas on the two conductive layers are overlapped, and local erasing of the diagonally adjacent areas is realized.
In one or more embodiments, the liquid crystal writing film is locally erased by adopting the voltage application method for locally erasing the liquid crystal writing board;
the liquid crystal writing film includes: the liquid crystal display panel comprises a first conductive layer, a second conductive layer and a liquid crystal layer positioned between the two conductive layers; the first conducting layer and the second conducting layer are respectively divided into two or more conducting areas which are insulated with each other;
each conductive area of the first conductive layer is distributed along a first direction, each conductive area of the second conductive layer is distributed along a second direction, and the first direction and the second direction are mutually staggered in space; the conductive areas of the first conductive layer and the second conductive layer form an erasable area together with the corresponding liquid crystal layer area at the overlapped part of the space.
In consideration of the processing cost and the difficulty degree of the process, the conductive layer is divided into the strip-shaped conductive areas, so that the processing efficiency is improved, the process cost is reduced, and the mass production is facilitated.
In one or more embodiments, a writing board is disclosed, which includes the above-described liquid crystal writing film;
further, still include:
the handwriting storage unit is used for directly recording and storing writing track information; or converting the writing track into a standard character or a standard graph and storing the standard character or the standard graph;
furthermore, the tablet further comprises:
the handwriting storage unit is used for directly recording and storing writing track information; or converting the writing track into a standard character or a standard graph and storing the standard character or the standard graph;
and the communication unit is used for communicating with the external equipment and transmitting the stored writing track information or the standard characters or the standard graphics to the external equipment.
A blackboard disclosed in one or more embodiments includes the above-described liquid crystal writing film;
further, still include:
the handwriting storage unit is used for directly recording and storing writing track information; or converting the writing track into a standard character or a standard graph and storing the standard character or the standard graph;
further, the blackboard further comprises:
the handwriting storage unit is used for directly recording and storing writing track information; or converting the writing track into a standard character or a standard graph and storing the standard character or the standard graph;
and the communication unit is used for communicating with the external equipment and transmitting the stored writing track information or the standard characters or the standard graphics to the external equipment.
In one or more embodiments, a drawing board is disclosed, which includes the liquid crystal writing film described above.
Further, still include:
the handwriting storage unit is used for directly recording and storing writing track information; or converting the writing track into a standard character or a standard graph and storing the standard character or the standard graph;
furthermore, the drawing board further comprises:
the handwriting storage unit is used for directly recording and storing writing track information; or converting the writing track into a standard character or a standard graph and storing the standard character or the standard graph;
and the communication unit is used for communicating with the external equipment and transmitting the stored writing track information or the standard characters or the standard graphics to the external equipment.
Compared with the prior art, the invention has the beneficial effects that:
compared with the prior art, the single block area in the scheme of the invention only needs to provide three types of output of erasing voltage, zero voltage and high resistance state when being erased, thereby greatly reducing the complexity of the voltage output circuit.
The two diagonally connected areas can be simultaneously erased, and the problem of quick erasing in the oblique line direction is solved.
Only providing voltage for the conductive area where the erasing area is located, wherein the rest conductive areas except the conductive area where the erasing area is located are in a high-resistance state and cannot provide charge and discharge current; compared with the mode of adopting the auxiliary voltage to realize local erasing, the method of the invention can not influence the handwriting display of the peripheral area.
The writing delay phenomenon after the erasing is finished is obviously improved, and the user experience is improved.
The fields in which the present solution can be applied include: the writing board, the light energy liquid crystal writing board, the light energy large liquid crystal writing blackboard, the light energy dust-free writing board, the light energy portable blackboard, the electronic drawing board, the lcd electronic writing board, the electronic note book, the doodle board, the children writing board, the children doodle drawing board, the eraser function sketch board, the liquid crystal electronic drawing board, the color liquid crystal writing board and the like.
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 diagram illustrating erasing of a liquid crystal writing film according to an embodiment of the present invention by applying a voltage to a first half field of each conductive region;
FIG. 2 is a schematic diagram illustrating erasing by applying a voltage in a back field of each conductive region of a liquid crystal writing film according to an embodiment;
FIG. 3 is a schematic diagram of a third embodiment of an erasing process by applying a voltage to the first half field of each conductive region of the liquid crystal writing film;
FIG. 4 is a schematic diagram of a third embodiment of an erasing operation performed by applying a voltage to a back field of each conductive region of a liquid crystal writing film;
FIG. 5 is a schematic diagram of a liquid crystal writing film according to the fifth embodiment.
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
The embodiment discloses a voltage application method for realizing local erasing of a liquid crystal writing board, wherein a liquid crystal writing film comprises two conducting layers and a liquid crystal layer arranged between the two conducting layers; the two conductive layers are respectively divided into two or more conductive areas;
applying a first voltage to a conductive region of the first conductive layer overlying the partially erased area; applying zero voltage to a conductive region of the second conductive layer overlying the partially erased area; the rest conductive regions are in a high-resistance state;
the first voltage and the zero voltage form an erasing electric field at the position where the two conductive areas are overlapped; the first voltage is at least greater than a voltage required for completely erasing the handwriting, and in the embodiment, the first voltage is an erasing voltage.
After a set time (approximately 10MS to 200MS), the voltages applied to the two conductive layers are interchanged, i.e.: applying a zero voltage to a conductive region of the first conductive layer covering the partially erased area; applying a first voltage to a conductive region of the second conductive layer overlying the partially erased area; the remaining conductive region is in the high resistance state for a set time (about 10MS to 200 MS).
After the voltage is exchanged, the electric fields formed on the whole liquid crystal writing film are the same in size but opposite in direction, so that the phenomenon of liquid crystal polarization caused by applying the electric field in the same direction to the liquid crystal writing film for a long time can be avoided. In this patent, two time periods with different electric field directions are respectively called a first half field and a second half field.
And repeating the process, and after a plurality of cycles, realizing local erasing by using an erasing electric field formed by the first voltage and the zero voltage at the overlapped position of the two conductive areas.
The voltage applied to each conductive region on the liquid crystal writing film is as shown in fig. 1 or fig. 2. Wherein, fig. 1 is the voltage applied to the front half field of each conductive area of the liquid crystal writing film, and fig. 2 is the voltage applied to the back half field of each conductive area of the liquid crystal writing film; the order of the first half field and second half field supply voltages may be interchanged.
The following description will be made by taking fig. 1 as an example.
In fig. 1, HIZ indicates a HIGH resistance, HIGH indicates a ground erase voltage, and GND indicates a ground zero voltage; BLOCK denotes the area to be erased. The erasing voltage is a voltage required for completely erasing the handwriting.
The first conducting layer is assumed to be divided into a plurality of conducting areas which are parallel in the transverse direction, and the second conducting layer is assumed to be divided into a plurality of conducting areas which are parallel in the vertical direction;
applying zero voltage to the conductive area on the first conductive layer where the to-be-erased area BLOCK is located, and applying erasing voltage to the conductive area on the second conductive layer where the to-be-erased area BLOCK is located; the rest conductive areas present a high resistance state; at this time, although the column or row where the BLOCK to be erased is located will generate the induced voltage, the opposite column or row on the other conductive layer is in a high resistance state, so the peripheral region of the BLOCK to be erased cannot provide the charging and discharging current, and no electric field is formed.
At this time, the electric field formed over the entire liquid crystal writing film satisfies: the electric field of the region to be erased is an erase voltage HIGH; while the remaining erase region has no electric field formed. Thus, only the BLOCK of the area to be erased is erased, while the remaining BLOCKs are not affected.
Likewise, the same is true of the voltage application principle of the second half field shown in fig. 2.
The BLOCK to be erased may be a local erase area of a minimum cell, or may be a square area formed by combining a plurality of local erase areas.
Each conductive area of the liquid crystal writing film is connected with a multi-voltage output circuit through an electrode and a corresponding lead; the multi-voltage output circuit can provide voltages in three voltage forms for each conductive area according to requirements: erase voltage, zero voltage, and high resistance state (i.e., disconnected).
The voltage application method for realizing the local erasing of the liquid crystal writing board can be realized only by providing voltage forms in three states, thereby greatly reducing the complexity of a circuit and saving the cost; meanwhile, the writing delay phenomenon after partial erasing is improved.
Example two
The embodiment discloses a voltage application system for realizing local erasing of a liquid crystal writing board, which comprises: the liquid crystal writing film comprises a first conducting layer, a second conducting layer and a liquid crystal layer positioned between the two conducting layers; the two conductive layers are respectively divided into two or more conductive areas; applying a first voltage to a conductive region of the first conductive layer overlying the partially erased area; applying zero voltage to a conductive region of the second conductive layer overlying the partially erased area; the rest conductive regions are in a high-resistance state;
after a set time (approximately 10MS to 200MS), the voltages applied to the two conductive layers are interchanged, i.e.: applying a zero voltage to a conductive region of the first conductive layer covering the partially erased area; applying a first voltage to a conductive region of the second conductive layer overlying the partially erased area; the remaining conductive region is in the high resistance state for a set time (about 10MS to 200 MS).
And repeating the process, and after a plurality of cycles, realizing local erasing by using an erasing electric field formed by the first voltage and the zero voltage at the overlapped position of the two conductive areas.
Each conductive region is connected to a multi-voltage output circuit capable of applying a first voltage, zero voltage, or high resistance state to the conductive region as desired.
In some embodiments, the multi-voltage output circuit has a structure form including: the boost circuit comprises a main controller and a boost circuit, wherein the main controller generates a control signal; the booster circuit generates corresponding erasing voltage or zero voltage or disconnects the connection with the conductive area according to the control signal generated by the main controller, wherein whether the connection with the conductive area is disconnected or not can be controlled by controlling the conduction of the switch tube.
The first voltage is at least greater than the voltage required to completely erase the handwriting, and in this embodiment, the first voltage is an erase voltage.
EXAMPLE III
Based on the local erase voltage application method for a single BLOCK to-be-erased area BLOCK in the first embodiment, the present embodiment discloses a local erase voltage application method capable of simultaneously erasing two diagonally adjacent areas.
The structure of the liquid crystal writing film is the same as that in the first embodiment, assuming that the first partially to-be-erased area BLOCK1 and the second partially to-be-erased area BLOCK2 are diagonally adjacent; the voltage applied to each conductive region on the liquid crystal writing film is as shown in fig. 3 or fig. 4. Wherein, fig. 3 is the voltage applied to the front half field of each conductive area of the liquid crystal writing film, and fig. 4 is the voltage applied to the back half field of each conductive area of the liquid crystal writing film; the order of the first half field and second half field supply voltages may be interchanged.
The following description will be made by taking fig. 3 as an example.
In fig. 3, HIZ indicates a HIGH resistance, HIGH indicates a ground erase voltage, and GND indicates a ground zero voltage; BLOCK1 indicates the first local area to be erased, and BLOCK2 indicates the first local area to be erased. The erasing voltage is a voltage required for completely erasing the handwriting.
The first conducting layer is assumed to be divided into a plurality of conducting areas which are parallel in the transverse direction, and the second conducting layer is assumed to be divided into a plurality of conducting areas which are parallel in the vertical direction;
applying zero voltage to a conductive region of the first conductive layer overlying the first local erase region BLOCK 1; applying an erase voltage to a conductive region of the second conductive layer overlying the first local erase region BLOCK 1; applying an erase voltage to a conductive region of the first conductive layer overlying the second local erase region BLOCK 2; applying zero voltage to a conductive region of the second conductive layer overlying the second local erase region BLOCK 2; the rest conductive regions are in a high-resistance state;
at this time, although the row or column of the region to be erased generates an induced voltage, the row or column of the other conductive layer opposite to the induced voltage is in a high-resistance state, so that the peripheral region of the region to be erased cannot provide a charge and discharge current, and an electric field is not formed.
At this time, the electric field formed over the entire liquid crystal writing film satisfies: the electric field of the first local region to be erased is HIGH; the electric field of the second local region to be erased is-HIGH; while the remaining erase region has no electric field formed. Thus, only the writing of the first and second partial erase areas BLOCK1 and BLOCK2 is erased, and the writing of the remaining areas is not affected.
After a set time (about 10MS to 200MS), the voltages applied to the two conductive layers are interchanged, and the second half field voltage application mode shown in fig. 4 is entered, that is: applying an erase voltage to a conductive region of the first conductive layer overlying the first local erase region BLOCK 1; applying zero voltage to a conductive region of the second conductive layer overlying the first local erase region BLOCK 1; applying zero voltage to a conductive region of the first conductive layer overlying the second local erase region BLOCK 2; applying an erase voltage to a conductive region of the second conductive layer overlying the second local erase region BLOCK 2; the rest conductive regions are in a high-resistance state;
and repeating the process, and after a plurality of cycles, utilizing an erasing electric field formed by the erasing voltage and the zero voltage at the overlapped position of the two conductive areas to erase the first local erasing area and the second local erasing area.
The voltage application method for realizing the local erasing of the liquid crystal writing board can be realized by only providing voltage forms in three states, thereby greatly reducing the complexity of a circuit, saving the cost and improving the writing delay phenomenon after the local erasing; meanwhile, two conductive areas which are diagonally connected can be simultaneously erased, and the problem of quick erasing in the oblique line direction is solved.
Example four
The embodiment discloses a voltage application system for realizing local erasing of a liquid crystal writing board, which comprises: the liquid crystal writing film comprises two conducting layers and a liquid crystal layer positioned between the two conducting layers; the two conductive layers are respectively divided into two or more conductive areas; applying a first voltage to a conductive region of a first conductive layer overlying a first local erase region; applying a zero voltage to a conductive region of the second conductive layer overlying the first local erase region; applying zero voltage to the conductive region of the first conductive layer overlying the second partially erased area; applying a first voltage to a conductive region of the second conductive layer overlying the second partially erased area; the rest conductive regions are in a high-resistance state; the first and second partially erased areas are diagonally adjacent; the first voltage is at least greater than a voltage required for completely erasing the handwriting, and in the embodiment, the first voltage is an erasing voltage.
After a set time (approximately 10MS to 200MS), the voltages applied to the two conductive layers are interchanged, i.e.: applying an erase voltage to a conductive region of the first conductive layer overlying the first local erase region BLOCK 1; applying zero voltage to a conductive region of the second conductive layer overlying the first local erase region BLOCK 1; applying zero voltage to a conductive region of the first conductive layer overlying the second local erase region BLOCK 2; applying an erase voltage to a conductive region of the second conductive layer overlying the second local erase region BLOCK 2; the rest conductive regions are in a high-resistance state;
the erasing voltage and the zero voltage form an erasing electric field at the overlapped position of the conductive areas on the two conductive layers, and local erasing of the diagonal adjacent areas is realized.
The conductive region is connected to a multi-voltage output circuit capable of applying an erase voltage, a zero voltage, or a high resistance state to the conductive region as required. In some embodiments, the multi-voltage output circuit has a structure form including: the boost circuit comprises a main controller and a boost circuit, wherein the main controller generates a control signal; the booster circuit generates corresponding erasing voltage or zero voltage or disconnects the connection with the conductive area according to the control signal generated by the main controller, wherein whether the connection with the conductive area is disconnected or not can be controlled by controlling the conduction of the switch tube.
EXAMPLE five
This embodiment mode discloses a liquid crystal writing film using a voltage application method for realizing local erasure of a liquid crystal writing board on the basis of the first and third embodiments, as shown in fig. 5, including: the liquid crystal display panel comprises a first conductive layer, a liquid crystal layer and a second conductive layer which are sequentially arranged from top to bottom;
the first conducting layer is divided into two or more transverse conducting areas which are mutually insulated, the second conducting layer is divided into two or more longitudinal conducting areas which are mutually insulated, and the conducting areas are equally spaced; the conductive regions on the first conductive layer are spatially vertically interleaved with the conductive regions on the second conductive layer. By dividing the conductive layer, the writing film is divided into a mesh structure, and each mesh is a separate erasing area.
Applying a voltage to each of the conductive regions on the first conductive layer and the second conductive layer enables an electric field to be formed in each of the erase regions, and local erasing is performed using a different electric field formed in each of the erase regions.
In one embodiment, the first conductive layer is divided into two horizontal conductive regions, the second conductive layer is divided into two vertical conductive regions, and a plurality of erasing regions are formed at the overlapping part of the two conductive layers in space.
EXAMPLE six
On the basis of the first embodiment to the fifth embodiment, specific application products of the liquid crystal writing film adopting the voltage application method for realizing the local erasing of the liquid crystal writing board are disclosed, such as:
the liquid crystal writing film adopting the voltage application method for realizing the local erasing of the liquid crystal writing board is applied to the writing board, so that the local erasing function of the writing board is realized.
For example, when writing, the conventional liquid crystal writing board senses pressure through a resistance-type touch screen, calculates a pressure position, feeds back and records a handwriting track, and realizes storage of the writing track; or converting the writing track into a standard character or a standard graph for storage.
The liquid crystal writing film adopting the voltage application method for realizing the local erasing of the liquid crystal writing board is applied to the liquid crystal writing board capable of memorizing, so that the function of local erasing is realized.
Furthermore, a communication unit is arranged on the writing board with the memory function and the local erasing function, and the communication unit is communicated with external equipment in a wired or wireless communication mode.
The external device may be a mobile terminal such as a mobile phone or PAD, or may be a PC or other device terminal as will occur to those skilled in the art.
Similarly, the liquid crystal writing film of the present invention, which employs the voltage application method for achieving partial erasure of the liquid crystal writing board, may also be applied to other memorable blackboards or drawing boards, and may be capable of transmitting the stored writing trace information or standard characters or standard graphics to an external device through a communication unit.
As another embodiment, the liquid crystal writing film adopting the voltage application method for realizing the local erasure of the liquid crystal writing board of the present invention is applied to a light energy writing board, a light energy liquid crystal writing board, a light energy large liquid crystal writing blackboard, a light energy dust-free writing board, a light energy portable blackboard, an electronic drawing board, an lcd electronic writing board, an electronic notepad, a doodle board, a child writing board, a child doodle drawing board, an eraser function sketch board, a liquid crystal electronic drawing board, a color liquid crystal writing board, or other related products known to those skilled in the art, so as to realize the local erasure function of the above products.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (12)
1. A voltage application system for realizing partial erasing of a liquid crystal writing board comprises: the liquid crystal writing film comprises a first conducting layer, a second conducting layer and a liquid crystal layer positioned between the two conducting layers; the two conductive layers are respectively divided into two or more conductive areas; wherein a first voltage is applied to a conductive region of the first conductive layer overlying the local erase region; applying a second voltage to a conductive region of the second conductive layer overlying the partially erased area; the rest conductive regions are in a high-resistance state; the first voltage and the second voltage form an erasing electric field at the overlapped position of the two conductive areas to realize local erasing.
2. The voltage application system for realizing partial erasing of a liquid crystal writing board according to claim 1, wherein the conductive region is connected to a multi-voltage output circuit capable of applying a first voltage, a second voltage or a high resistance state to the conductive region as required.
3. The voltage application system for realizing the partial erasing of the liquid crystal writing board as claimed in claim 1, wherein the first voltage is at least greater than the voltage required for completely erasing the written handwriting, and the second voltage is zero voltage.
4. A voltage application method for realizing local erasing of a liquid crystal writing board is characterized in that a liquid crystal layer is positioned between two conducting layers, and the two conducting layers are respectively divided into two or more conducting areas; it is characterized in that the process is as follows:
applying a first voltage to a conductive region of the first conductive layer overlying the partially erased area; applying a second voltage to a conductive region of the second conductive layer overlying the partially erased area; the rest conductive regions are in a high-resistance state; the first voltage and the second voltage form an erasing electric field at the overlapped position of the two conductive areas to realize local erasing.
5. A voltage application system for realizing partial erasing of a liquid crystal writing board comprises: the liquid crystal writing film comprises two conducting layers and a liquid crystal layer positioned between the two conducting layers; the two conductive layers are respectively divided into two or more conductive areas; wherein a first voltage is applied to a conductive region of the first conductive layer overlying the first local erase region; applying a second voltage to a conductive region of the second conductive layer overlying the first local erase region; applying a second voltage to a conductive region of the first conductive layer overlying the second partially erased area; applying a first voltage to a conductive region of the second conductive layer overlying the second partially erased area; the rest conductive regions are in a high-resistance state; the first and second partially erased areas are diagonally adjacent;
the first voltage and the second voltage form an erasing electric field at the position where the conductive areas on the two conductive layers are overlapped, and local erasing of the diagonally adjacent areas is realized.
6. The voltage application system for realizing partial erasing of a liquid crystal writing board according to claim 5, wherein the conductive region is connected to a multi-voltage output circuit capable of applying a first voltage, a second voltage or a high resistance state to the conductive region as required.
7. The voltage application system for realizing the partial erasing of the liquid crystal writing board as claimed in claim 5, wherein the first voltage is at least larger than the voltage required for completely erasing the written handwriting, and the second voltage is zero voltage.
8. A voltage application method for realizing local erasure of a liquid crystal writing board is characterized in that a liquid crystal writing film is positioned between two conducting layers, and the two conducting layers are respectively divided into two or more conducting areas; it is characterized in that the process is as follows:
applying a first voltage to a conductive region of a first conductive layer overlying a first local erase region; applying a second voltage to a conductive region of the second conductive layer overlying the first local erase region; applying a second voltage to a conductive region of the first conductive layer overlying the second partially erased area; applying a first voltage to a conductive region of the second conductive layer overlying the second partially erased area; the rest conductive regions are in a high-resistance state; the first and second partially erased areas are diagonally adjacent;
the first voltage and the second voltage form an erasing electric field at the position where the conductive areas on the two conductive layers are overlapped, and local erasing of the diagonally adjacent areas is realized.
9. A liquid crystal writing film, characterized in that, the local erasing of the liquid crystal writing film is realized by the voltage applying method for realizing the local erasing of the liquid crystal writing board in claim 4 or 8;
the liquid crystal writing film includes: the liquid crystal display panel comprises a first conductive layer, a second conductive layer and a liquid crystal layer positioned between the two conductive layers; the first conducting layer and the second conducting layer are respectively divided into two or more conducting areas which are insulated with each other;
each conductive area of the first conductive layer is distributed along a first direction, each conductive area of the second conductive layer is distributed along a second direction, and the first direction and the second direction are mutually staggered in space; the conductive areas of the first conductive layer and the second conductive layer form an erasable area together with the corresponding liquid crystal layer area at the overlapped part of the space.
10. A writing board comprising the liquid crystal writing film according to claim 9;
further, still include:
the handwriting storage unit is used for directly recording and storing writing track information; or converting the writing track into a standard character or a standard graph and storing the standard character or the standard graph;
furthermore, the tablet further comprises:
the handwriting storage unit is used for directly recording and storing writing track information; or converting the writing track into a standard character or a standard graph and storing the standard character or the standard graph;
and the communication unit is used for communicating with the external equipment and transmitting the stored writing track information or the standard characters or the standard graphics to the external equipment.
11. A blackboard comprising the liquid crystal writing film according to claim 9;
further, still include:
the handwriting storage unit is used for directly recording and storing writing track information; or converting the writing track into a standard character or a standard graph and storing the standard character or the standard graph;
further, the blackboard further comprises:
the handwriting storage unit is used for directly recording and storing writing track information; or converting the writing track into a standard character or a standard graph and storing the standard character or the standard graph;
and the communication unit is used for communicating with the external equipment and transmitting the stored writing track information or the standard characters or the standard graphics to the external equipment.
12. A drawing board comprising the liquid crystal writing film according to claim 9;
further, still include:
the handwriting storage unit is used for directly recording and storing writing track information; or converting the writing track into a standard character or a standard graph and storing the standard character or the standard graph;
furthermore, the drawing board further comprises:
the handwriting storage unit is used for directly recording and storing writing track information; or converting the writing track into a standard character or a standard graph and storing the standard character or the standard graph;
and the communication unit is used for communicating with the external equipment and transmitting the stored writing track information or the standard characters or the standard graphics to the external equipment.
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811455640.6A CN110147006B (en) | 2018-11-30 | 2018-11-30 | Voltage application system and method for realizing local erasing of liquid crystal writing board, liquid crystal writing film, writing board, blackboard and drawing board |
| PCT/CN2019/071227 WO2019227942A1 (en) | 2018-05-30 | 2019-01-10 | Liquid crystal writing film capable of implementing local erasure, local erasure method, multi-voltage output circuit, and positioning system |
| AU2019236746A AU2019236746B2 (en) | 2018-05-30 | 2019-01-10 | Liquid crystal writing film, partial erasing method, multi-voltage output circuit and positioning system capable of partial erasing |
| JP2019564923A JP7130676B2 (en) | 2018-05-30 | 2019-01-10 | Partially erasable liquid crystal writing film, partial erasing method, multi-voltage output circuit and positioning system |
| KR1020197034181A KR102328206B1 (en) | 2018-05-30 | 2019-01-10 | Liquid crystal writing film with partial erasure, partial erasure method, multiple voltage output circuit and positioning system |
| CA3057909A CA3057909C (en) | 2018-05-30 | 2019-01-10 | Liquid crystal writing film, partial erasing method, multi-voltage output circuit and positioning system capable of partial erasing |
| US16/492,689 US11137899B2 (en) | 2018-05-30 | 2019-01-10 | Liquid crystal writing film, partial erasing method, multi-voltage output circuit and positioning system capable of partial erasing |
| EP19786258.4A EP3605213A4 (en) | 2018-05-30 | 2019-01-10 | Liquid crystal writing film capable of implementing local erasure, local erasure method, multi-voltage output circuit, and positioning system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811455640.6A CN110147006B (en) | 2018-11-30 | 2018-11-30 | Voltage application system and method for realizing local erasing of liquid crystal writing board, liquid crystal writing film, writing board, blackboard and drawing board |
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| Publication Number | Publication Date |
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| CN110147006A CN110147006A (en) | 2019-08-20 |
| CN110147006B true CN110147006B (en) | 2021-03-19 |
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| CN201811455640.6A Active CN110147006B (en) | 2018-05-30 | 2018-11-30 | Voltage application system and method for realizing local erasing of liquid crystal writing board, liquid crystal writing film, writing board, blackboard and drawing board |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110703527B (en) * | 2019-09-04 | 2022-11-11 | 陈华丰 | Liquid crystal display device and erasing method thereof |
| CN112180628A (en) * | 2020-09-11 | 2021-01-05 | 山东蓝贝思特教装集团股份有限公司 | Liquid crystal writing device, local erasing method and display method |
| CN111999927B (en) * | 2020-09-15 | 2022-06-21 | 业成科技（成都）有限公司 | Electronic handwriting board and handwriting restoration method |
| CN112684618B (en) * | 2020-11-30 | 2021-07-30 | 山东蓝贝思特教装集团股份有限公司 | Liquid crystal writing device and method for realizing local erasing by utilizing illumination |
| 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 |
| CN114647105B (en) * | 2022-04-11 | 2024-03-29 | 北京奕斯伟计算技术股份有限公司 | Display device, electronic device and display control method |
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| WO2017223374A1 (en) * | 2016-06-22 | 2017-12-28 | Fenghua Li | Liquid crystal writing device with thermal erase |
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| CN107820582A (en) * | 2015-04-28 | 2018-03-20 | 唯酷有限公司 | Liquid crystal writing equipment |
| CN207529068U (en) * | 2017-10-23 | 2018-06-22 | 深圳市鸿合创新信息技术有限责任公司 | It is a kind of can selective erase liquid crystal writing plate |
| CN107844218B (en) * | 2017-11-14 | 2021-04-30 | 深圳市唯酷光电有限公司 | Liquid crystal writing pad with local erasing function, writing pen and liquid crystal blackboard |
| CN108563049A (en) * | 2018-05-30 | 2018-09-21 | 山东蓝贝思特教装集团股份有限公司 | A kind of writing film of achievable selective erase and application |
| CN108549169A (en) * | 2018-05-30 | 2018-09-18 | 山东蓝贝思特教装集团股份有限公司 | Using writing film and processing technology that selective erase can be achieved made of etching technics and application |
| CN108828821B (en) * | 2018-06-28 | 2021-01-12 | 广州林登科技有限公司 | Liquid crystal writing device capable of being locally erased and local erasing method |
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| WO2017223374A1 (en) * | 2016-06-22 | 2017-12-28 | Fenghua Li | Liquid crystal writing device with thermal erase |
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