CN113076052A - Local erasing method and system for liquid crystal writing board - Google Patents
Local erasing method and system for liquid crystal writing board Download PDFInfo
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- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000005674 electromagnetic induction Effects 0.000 claims abstract description 16
- 230000035945 sensitivity Effects 0.000 claims abstract description 14
- 230000035807 sensation Effects 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 5
- 230000009471 action Effects 0.000 abstract description 40
- 239000004986 Cholesteric liquid crystals (ChLC) Substances 0.000 description 15
- 230000004044 response Effects 0.000 description 7
- 238000009826 distribution Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 239000004065 semiconductor Substances 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
- G06F3/0487—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser
- G06F3/0488—Interaction techniques based on graphical user interfaces [GUI] using specific features provided by the input device, e.g. functions controlled by the rotation of a mouse with dual sensing arrangements, or of the nature of the input device, e.g. tap gestures based on pressure sensed by a digitiser using a touch-screen or digitiser, e.g. input of commands through traced gestures
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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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0414—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using force sensing means to determine a position
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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
- G06F3/046—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by electromagnetic means
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- G—PHYSICS
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
- G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
- G06F2203/04105—Pressure sensors for measuring the pressure or force exerted on the touch surface without providing the touch position
Abstract
A local erasing method and system for a liquid crystal writing board comprises the following steps: determining the coordinates of a target area and real-time pressure of the erasing object acting on the liquid crystal writing board in real time according to the electromagnetic induction intensity; and judging whether the range of the target area coordinate reaches a preset erasing area parameter and whether the real-time pressure sensitivity reaches a preset erasing pressure sensitivity value, and if so, erasing the writing trace on the target area coordinate on the liquid crystal writing board. The invention uses the contact type electromagnetic eraser as an erasing object, and presets the erasing area parameters by taking the shape and the size of the electromagnetic eraser as reference, thereby judging according to the shape, the size and the pressure sensitivity grade of the target area coordinate, quickly and effectively identifying the erasing action of the electromagnetic eraser and carrying out local erasing. For other actions of erasing objects and other actions of the electromagnetic eraser, the actions cannot be mistaken as local erasing instructions, so that the technical difficulty can be greatly reduced, and the accuracy is improved.
Description
[ technical field ] A method for producing a semiconductor device
The present invention relates to Liquid Crystal Display (LCD) tablets, and more particularly, to a method and system for erasing a portion of an LCD tablet.
[ background of the invention ]
The large-size liquid crystal writing board is usually applied to an intelligent blackboard, can be conveniently written on the intelligent blackboard, and can be cleaned by electrifying. Compared with the traditional blackboard, the blackboard has the advantages that dust is avoided, handwriting can be conveniently stored and kept as a note, and therefore the blackboard is more and more widely applied.
The common liquid crystal writing board is usually in a one-key erasing or integral erasing mode, and handwriting can be completely erased only by pressing an erasing key. This mode requires only power-up, no need to determine the clearing position, and no need to determine the action, and is therefore particularly simple to implement and widely applicable.
In practical application, however, partial erasing of handwriting is often required, and handwriting in other areas is retained. The current local erase method is generally: pressing a local erasing key to erase the medium (hands or other erased objects), then identifying the active coordinate of the erased medium by an additional infrared frame, and electrifying the part of the coordinate by a background driving software driving circuit to realize local erasing. This approach can create several problems: 1. the delay of the coordinate information identified by the infrared frame and the coarseness of the coordinate information; 2. when the pen is used for writing through a hard medium, and when the pen is used for erasing, the pen is also used for writing through the hard medium, and the recognition operation generates misoperation, namely the pen is used for writing clearly, but the pen is recognized to be cleared. 3. The recognition by the erasing action may be performed in the space, for example, walking or waving a hand in front of the blackboard may be mistaken for the erasing action to trigger the erasing. Therefore, the conventional local erasing method has a great difficulty in identifying the erasing action of the erasing medium, it is difficult to ensure the identification accuracy, it is easy to cause the misoperation, and thus, it is desired to improve.
[ summary of the invention ]
The present invention is directed to solve the above problems, and provides a method and a system for partially erasing a liquid crystal tablet, which improve the recognition accuracy by using a contact-type electromagnetic eraser as an erasing object.
In order to solve the above problems, the present invention provides a method for partially erasing a liquid crystal tablet, which comprises the following steps: determining the coordinates of a target area and real-time pressure of the erasing object acting on the liquid crystal writing board in real time according to the electromagnetic induction intensity; and judging whether the range of the target area coordinate reaches a preset erasing area parameter and whether the real-time pressure sensation reaches a preset erasing pressure sensation value, and if so, erasing the writing trace on the target area coordinate on the liquid crystal writing board.
Further, the erasing area parameter is determined based on the erasing surface parameter of the electromagnetic board eraser used with the liquid crystal writing board.
Further, determining shape parameters based on the shape of the erasing surface of the electromagnetic eraser; determining a size parameter based on the size of the erasing surface of the electromagnetic board eraser; determining the erasing area parameter based on the shape parameter and the size parameter.
Further, the parameters of the erasing area are determined according to the shape parameters, the size parameters and the customized correction coefficients.
In addition, the invention also provides a local erasing system of the liquid crystal writing board, which comprises the liquid crystal writing board, the liquid crystal writing board is provided with a handwriting film capable of displaying handwriting in real time and a first coil array, it is characterized by also comprising an electromagnetic blackboard eraser, wherein the electromagnetic blackboard eraser is provided with a second coil array which can perform electromagnetic induction with the first coil array, the liquid crystal writing board is provided with a processing unit which can determine the coordinates of a target area acted on the liquid crystal writing board by the electromagnetic board eraser and the real-time pressure according to the electromagnetic induction intensity between the second coil array and the first coil array, when the range of the target area coordinate reaches a preset erasing area parameter and the real-time pressure sensation reaches a preset erasing pressure sensation value, and the processing unit controls the handwriting film to erase the writing trace on the target area coordinate.
The electromagnetic board eraser is further characterized in that the electromagnetic board eraser is provided with an erasing surface, and the parameters of the erasing area are determined according to the parameters of the erasing surface of the electromagnetic board eraser.
Further, the parameters of the erasing surface comprise a shape parameter and a size parameter, and the shape parameter is determined based on the shape of the erasing surface of the electromagnetic board eraser; the size parameter is determined based on the size of the erasing surface of the electromagnetic board eraser.
Further, the parameters of the erasing area are determined according to the shape parameters, the size parameters and the self-defined correction coefficients.
Further, the processing unit comprises a calculating unit, an erasing area comparing unit and a pressure sensing comparing unit, wherein the calculating unit is used for determining the coordinates of the target area and real-time pressure sensing according to the electromagnetic induction intensity between the first coil array and the second coil array; the erasing area comparing unit is used for comparing the range of the target area coordinate with the erasing area parameter; the pressure-sensitive comparison unit is used for comparing the real-time pressure sensitivity with the erasing pressure sensitivity value.
The present invention advantageously contributes to effectively solving the above-mentioned problems. The local erasing method and the system of the liquid crystal writing board use the contact type electromagnetic board eraser as an erasing object, and preset erasing area parameters by taking the shape and the size of the electromagnetic board eraser as references, thereby judging according to the shape and the size of a target area coordinate and the pressure sensitivity level and quickly and effectively identifying the erasing action of the electromagnetic board eraser. Only when the shape, the size and the pressure sensitivity grade meet the conditions, the current local erasing action is considered to be effective, at the moment, the local erasing is executed, and other actions of erasing objects and other actions of the electromagnetic board eraser cannot be mistaken for local erasing instructions, so that the technical difficulty can be greatly reduced, and the accuracy is improved. The local erasing method and the system of the liquid crystal writing board have strong practicability and are suitable for being widely popularized.
[ description of the drawings ]
FIG. 1 is a flow chart of the method of the present invention.
Fig. 2 is a flow chart of the method of the present invention.
Fig. 3 is a flow chart of the method of the present invention.
Fig. 4 is a flow chart of a method of the present invention.
Fig. 5 is a block diagram of the principle architecture of the present invention.
[ detailed description ] embodiments
The following examples are further illustrative and supplementary to the present invention and do not limit the present invention in any way.
As shown in FIG. 1 to FIG. 4, the local erasing method of the liquid crystal tablet of the present invention comprises the following steps:
s1, determining the coordinates of the target area and the real-time pressure feeling of the erasing objects acting on the liquid crystal writing board 10 in real time according to the electromagnetic induction intensity;
s2, judging whether the range of the target area coordinate reaches a preset erasing area parameter or not, and whether the real-time pressure feeling reaches a preset erasing pressure feeling value or not. If yes, erasing the writing trace on the target area coordinate on the liquid crystal writing board 10.
In step S1, the real-time pressure sensing and the determination of the coordinates of the target area may be performed by a known technique. When the erasing objects have coil arrays and can mutually correspond to the liquid crystal writing board 10, the erasing objects act on the liquid crystal writing board 10
In step S2, the erasing area parameter is determined based on the parameter of the erasing surface of the electromagnetic eraser 20 used with the liquid crystal tablet 10, so that the liquid crystal tablet 10 can only respond to the erasing action of the electromagnetic eraser 20 used with the liquid crystal tablet 10, but cannot respond to the erasing action of any other erasing object, thereby avoiding the erroneous erasing or the recognition error.
The parameters of the erasing surface comprise shape parameters and size parameters.
The shape parameter is determined based on the shape of the erasing surface of the electromagnetic eraser 20, and may be set according to actual conditions, and the range is not limited. For example, the electromagnetic eraser 20 may be a rectangular object, the erasing surface of which is rectangular, and the shape parameter is data describing that the erasing surface is rectangular. For another example, the electromagnetic eraser 20 may be a round box object, the erasing surface of which is round, and the shape parameter is data describing that the erasing surface is round. The description of the shape parameters is not limited. The shape of the erase surface of the associated electromagnetic eraser 20, which can be used to locally erase a particular liquid crystal tablet 10, is determined, and thus, the shape parameters are determined with respect to the liquid crystal tablet 10. For example, the erasing surface of the matched electromagnetic eraser 20 is determined to be selected to be rectangular, and the shape parameters are determined to be data describing that the erasing surface is rectangular.
The size parameter is determined based on the size of the erasing surface of the electromagnetic eraser 20, and can be set according to actual conditions, and the range is not limited. The dimensions of the erase surface of the associated electromagnetic eraser 20 that can be used to partially erase a particular liquid crystal tablet 10 are determined, and thus, the dimensional parameters are determined with respect to the liquid crystal tablet 10. For example, the size parameter may be 500cm2。
In some embodiments, the erased area parameter is determined based on the shape parameter, the size parameter. The erasing area parameter is a collection of shape parameters and size parameters. In this way, only when the electromagnetic eraser 20 matched with the liquid crystal tablet 10 and other erasers having the same shape and the same size as the erasing surface of the matched electromagnetic eraser 20 act on the liquid crystal tablet 10, the detected target area coordinate range can be matched with the preset erasing area parameters, and the local erasing can be performed. And the erasures having a difference in the shape of the other erasing surfaces and/or a difference in the size are applied to the liquid crystal writing board 10 and are not recognized as partial erasure and respond.
In some embodiments, the erased area parameter is determined based on the shape parameter, size parameter, and custom correction factor. The correction coefficient may be set according to actual conditions, and may be a determined value or a range. For example, when the correction factor is 1, the preset erasing area parameter is the same as the shape and size of the erasing surface of the matched electromagnetic eraser 20, so that only the electromagnetic eraser 20 matched with the liquid crystal writing board 10 and other erasing objects with the same shape and size as the erasing surface of the matched electromagnetic eraser 20 act on the liquid crystal writing board 10, and the liquid crystal writing board 10 may respond to the local erasing action. For another example, when the correction coefficient is set to 0.8-1.2, the preset erasing area parameter allows the target area coordinate range to be not completely consistent with the shape and size of the erasing surface of the erasing object, because the matched electromagnetic eraser 20 is used to act on the liquid crystal writing board 10, and due to the algorithm, the target area coordinate range calculated according to the electromagnetic induction intensity may not be completely consistent with the shape and size of the current electromagnetic eraser 20, and the correction coefficient is set, so that the fault tolerance can be improved, the response accuracy and the response sensitivity are compatible, and the problem of insensitive response caused by the problem of calculation precision is avoided.
In step S2, when determining whether the range of the target area coordinate reaches a preset erasing area parameter and whether the real-time pressure reaches a preset erasing pressure value, in different embodiments, different methods may be adopted for determining.
As shown in fig. 2, in some embodiments, it may be determined whether the real-time pressure reaches a preset erasing pressure value; and if the real-time pressure is smaller than the preset erasing pressure value, finishing the judgment, and considering that the local erasing is not required to be executed currently. And if the real-time pressure is more than or equal to a preset erasing pressure value, further judging whether the range of the target area coordinate reaches a preset erasing area parameter. If the range of the target area coordinate reaches the preset erasing area parameter, the current action of the erased object is considered to be a local erasing action and needs to be performed local erasing, and at this time, the writing trace on the target area coordinate on the liquid crystal writing board 10 is erased. And if the range of the target area coordinate does not reach the preset erasing area parameter, the current action of the erased object is not considered to be a credible local erasing action, and the local erasing is not executed at the moment.
As shown in fig. 3, in some embodiments, it may be determined whether the range of the target area coordinates reaches a preset erasing area parameter. And if the range of the target area coordinate does not reach the preset erasing area parameter, finishing the judgment, and considering that the local erasing is not required to be executed currently. And if the range of the target area coordinate reaches a preset erasing area parameter, further judging whether the real-time pressure feeling reaches a preset erasing pressure feeling value. If the real-time pressure feeling reaches the preset erasing pressure feeling value, the current action of the erased object is considered to be reliable local erasing action and needs to be executed local erasing, and at the moment, the writing trace on the target area coordinate on the liquid crystal writing board 10 is erased. And if the real-time pressure feeling does not reach the preset erasing pressure feeling value, the current action of erasing the object is not a credible local erasing action, and the local erasing is not executed at the moment.
As shown in fig. 4, in some embodiments, it may be determined whether the range of the target area coordinate reaches a preset erasing area parameter and whether the real-time pressure reaches a preset erasing pressure value. Only when the two are satisfied at the same time, the current erasing action is considered to be a reliable local erasing action and needs to be executed, and at this time, the writing trace on the target area coordinate on the liquid crystal writing board 10 is erased. Otherwise, the current action of erasing the object is not considered to be a credible local erasing action, and at the moment, the local erasing is not executed.
The local erasing method of the liquid crystal writing board of the invention uses the shape, the size and the pressure value of the matched electromagnetic board eraser 20 as the judgment conditions, and only when the range of the target area coordinate of the eraser acting on the liquid crystal writing board 10 accords with the erasing area parameter and the real-time pressure accords with the erasing pressure value, the local erasing action which is currently credible is considered to be executed to execute the local erasing. Therefore, when the erasing objects with different shapes and sizes are close to the liquid crystal writing board 10, the local erasing action cannot be identified, so that the effective erasing objects can be conveniently distinguished, and the difficulty in identifying the erasing objects is reduced. In addition, only when the pressure-sensitive value during the action reaches the preset erasing pressure-sensitive value, the local erasing is considered to be credible, and the electromagnetic eraser 20 is prevented from being identified as the local erasing when the electromagnetic eraser 20 acts a certain distance in front of the liquid crystal writing board 10 or slightly contacts the liquid crystal writing board 10, so that the erasing misoperation is avoided.
In addition, as shown in FIG. 5, the present embodiment further provides a partial erasing system for a liquid crystal tablet, which includes a liquid crystal tablet 10 and an electromagnetic eraser 20.
The liquid crystal writing board 10 is provided with a handwriting film 11, a first coil array 13 and a processing unit 12.
The handwriting film 11 can display handwriting in real time, is a cholesteric liquid crystal handwriting film 11 and can display pressure handwriting. The handwriting film 11 is generally provided with a cholesteric liquid crystal layer and a conductive layer, wherein the cholesteric liquid crystal layer can make the cholesteric liquid crystal inside the handwriting film turn from a transparent state to a color reflection state under the action of pressure, so that the color can be reflected to make the handwriting film 11 display visible handwriting. The conducting layer is used for electrifying the cholesteric liquid crystal layer to turn over cholesteric liquid crystal in the cholesteric liquid crystal layer, so that the cholesteric liquid crystal is reset to erase the writing.
The conducting layer is densely distributed with criss-cross conducting electrodes, and the cholesteric liquid crystals at different coordinate positions can be positioned through the criss-cross conducting electrodes, so that the cholesteric liquid crystals at different coordinate positions can be electrified and reset, and writing handwriting at the position can be erased. And all the conductive electrodes are electrified to reset all the cholesteric liquid crystals, so that the global erasing is realized. The erasing is carried out by electrifying the cholesteric liquid crystal at the specific coordinate position, belonging to local erasing.
When any penholder, including an electromagnetic pen, is used for writing on the handwriting film 11, the handwriting film 11 displays the handwriting in real time, and the handwriting is displayed and maintained without power consumption. When local erasing is needed, the corresponding conductive electrode needs to be controlled to electrify the cholesteric liquid crystal at the position.
The first coil array 13 is distributed on the lower side of the handwriting film 11, and is used for performing electromagnetic induction with an electromagnetic pen and an electromagnetic eraser 20. The distribution mode of the first coil array 13 may be set as required, and the distribution density thereof may be the same as or different from that of the conductive electrodes.
The electromagnetic eraser 20 is dedicated to partially erasing the liquid crystal writing board 10, i.e., partially erasing the pressure writing displayed on the writing film 11.
The second coil array 21 is distributed inside the electromagnetic eraser 20. The second coil array 21 may electromagnetically induce with the first coil array 13.
When the electromagnetic eraser 20 acts on the liquid crystal tablet 10, the first coil array 13 and the second coil array 21 are mutually induced. The closer the electromagnetic eraser 20 is, the higher the induction intensity of the first coil array 13 is, and the higher the induced electromotive force is. According to the magnitude of the electromotive force induced in the horizontal direction and the vertical direction, the X coordinate, the Y coordinate and the Z-axis pressure level of the electromagnetic eraser 20 can be determined through certain calculation processing. Wherein, the X coordinate and the Y coordinate are the position of the electromagnetic eraser 20, and the pressure grade of the Z axis is the pressure.
The electromagnetic eraser 20 is provided with an erasing surface. The shape of the wiping surface may be set as desired, and for example, it may be set as a rectangle, a circle, an ellipse, a triangle, or the like. The erasing surface can be conveniently attached to the liquid crystal writing board 10, and therefore, the erasing surface should be planar. For a certain electromagnetic eraser 20, the shape and size of the erasing surface should be fixed, so that the liquid crystal writing board 10 can conveniently recognize the erasing surface.
The size of the erasing surface of the electromagnetic eraser 20 should be significantly larger than the area of the writing head of the electromagnetic pen, so that the writing and erasing actions can be distinguished by the size (i.e. area) of the area coordinates at the sensing position. When the real-time pressure senses reach the preset erasing pressure sensing value, if the size of the sensed target area coordinate is obviously small, the electromagnetic pen is used for writing, and therefore the phenomenon that the writing action of the electromagnetic pen is mistaken as a local erasing action is avoided. The specific size of the erasing surface of the electromagnetic eraser 20 may be set as needed, which is different from the size of the area of the writing head of the electromagnetic pen, or may be set as needed. For example, the size of the erasing surface may be 2 times, 3 times, etc. the size of the writing head of the electromagnetic pen.
The erasing surface of the electromagnetic eraser 20 can be determined by the shape parameter and the size parameter. The shape parameter is determined based on the shape of the erase surface. Such as triangular, circular, square, etc. The size parameter is determined based on the size of the erase surface, and includes various parameters such as length, width, radius, and area.
The electromagnetic eraser 20 may be provided with or without a power supply, and may be specifically provided as required, so that the second coil array 21 may perform electromagnetic induction with the first coil array 13.
To determine whether the action currently applied to the liquid crystal tablet 10 is a partial erase action, a processing unit 12 is provided within the liquid crystal tablet 10. The processing unit 12 is connected to the conductive electrodes of the first coil array 13 and the handwriting film 11, and can determine the target area coordinates and real-time pressure feeling of the erased object and the written object acting on the liquid crystal writing board 10 according to the electromotive force generated by the electromagnetic induction between the first coil array 13 and the second coil array 21, and can perform judgment according to the target area coordinates and the real-time pressure feeling, so as to control the voltage of the conductive electrodes to electrify the cholesteric liquid crystal at the corresponding coordinate position, thereby realizing local clearing. When the processing unit 12 determines that the range of the target area coordinate reaches a preset erasing area parameter and the real-time pressure reaches a preset erasing pressure value, the processing unit 12 controls the conductive electrode of the handwriting film 11 to erase the writing trace on the target area coordinate.
The erasing area parameter is determined according to the parameters of the erasing surface of the electromagnetic eraser 20, namely the shape parameter and the size parameter. Further, the parameters of the erasing area can be determined according to the shape parameters, the size parameters and the self-defined correction coefficients of the erasing surface.
The preset erasing area parameter is used to determine whether the shape and size of the object currently acting on the liquid crystal writing board 10 conform to the shape and size of the erasing surface of the electromagnetic eraser 20. If this condition is not met, it is not possible to use the electromagnetic eraser 20, and no matter how the current object is, it is not considered to be a partial erasing action. If this condition is met, the electromagnetic eraser 20 may be used, and other objects having similar shapes and sizes to the erasing surface of the electromagnetic eraser 20 may be used. The shape parameter and the size parameter of the preset erasing area may or may not be completely consistent with the shape and the size of the electromagnetic eraser 20, and may be specifically set as required. When the precision requirement is high, the erasing area parameter can be set to be consistent with the shape and size of the erasing surface of the electromagnetic eraser 20, and at this time, only when the electromagnetic eraser 20 matched with the liquid crystal writing board 10 and other erasing objects with the same shape and the same size as the erasing surface of the matched electromagnetic eraser 20 act on the liquid crystal writing board 10, the detected target area coordinate range can be matched with the preset erasing area parameter, the processing unit 12 can execute local erasing, and objects with different shapes and/or sizes of the other erasing surfaces act on the liquid crystal writing board 10, and the objects cannot be recognized as local erasing to respond. When the accuracy requirement is general, in order to improve the response sensitivity and accuracy, correction coefficients can be set for the shape parameters and the size parameters. The correction coefficient may be set according to actual conditions, and may be a determined value or a range. For example, when the correction factor is 1, the preset erasing area parameter is completely consistent with the shape and size of the erasing surface of the matched electromagnetic eraser 20. For another example, when the correction coefficient is set to 0.8-1.2, the preset erasing area parameter allows the target area coordinate range to be not completely consistent with the shape and size of the erasing surface of the erasing object. In practice, the matched electromagnetic eraser 20 is used to act on the liquid crystal writing board 10, and due to an algorithm or a user operation habit, the coordinate range of the target area calculated according to the electromagnetic induction intensity may not be completely consistent with the shape and the size of the current electromagnetic eraser 20, and a correction coefficient is set, so that the fault tolerance can be improved, and objects with basically the same shape and the basically the same size can be identified as the electromagnetic eraser 20, so that the response accuracy and the response sensitivity are compatible, and the problem of insensitive response caused by the problem of calculation accuracy is avoided.
The preset erasing pressure value is used for judging whether the force currently acting on the liquid crystal writing board 10 is the erasing force, so that the situations of accidental touch and the like are distinguished. The magnitude of the erasing pressure sensing value can be determined according to actual conditions. For example, if the pressure feeling generated by the ordinary user during normal erasing is not less than 10 levels, the erasing pressure feeling value may be set to 10 levels, and if the real-time pressure feeling is less than 10 levels, the user may not consider the erasing operation.
Only when the range of the target area coordinate accords with the erasing area parameter condition and the real-time pressure sensing accords with the erasing pressure value condition, the processing unit 12 considers that the object currently acting on the liquid crystal writing board 10 is to perform local erasing, and at the moment, the processing unit 12 controls the voltage of the conductive electrode of the handwriting film 11, so that the cholesteric liquid crystal at the corresponding coordinate position is electrified and reset, and the writing trace on the target area coordinate is erased. In other cases, the processing unit 12 does not perform the local erase operation, thereby avoiding the malfunction.
To achieve the above function, the processing unit 12 is provided with a calculating unit, an erasing area comparing unit, and a pressure-sensitive comparing unit. The calculation unit can determine the coordinates of the target area and the real-time pressure feeling of the electromagnetic eraser 20 acting on the liquid crystal writing board 10 according to the electromagnetic induction intensity between the first coil array 13 and the second coil array 21. The erasing area comparing unit is used for comparing the target area coordinate with a preset erasing area parameter. The pressure-sensitive comparison unit is used for comparing the real-time pressure sensitivity with the pressure-sensitive erasing value.
The local erasing method and the system of the liquid crystal writing board of the invention use the contact type electromagnetic eraser 20 as an erasing object and judge according to the shape, the size and the pressure sensitivity grade of the target area coordinate, so that the erasing action of the electromagnetic eraser 20 which is a specific erasing object can be accurately identified and responded, and the action of other erasing objects can not be responded, and other actions of the electromagnetic eraser 20, such as space waving, accidental touch and the like, can not be responded. The method and the system for locally erasing the liquid crystal writing board 10 can greatly improve the identification accuracy and have strong practicability.
While the invention has been described with reference to the above embodiments, the scope of the invention is not limited thereto, and the above components may be replaced with similar or equivalent elements known to those skilled in the art without departing from the spirit of the invention.
Claims (9)
1. A local erasing method of a liquid crystal writing board is characterized by comprising the following steps:
determining the coordinates and real-time pressure of a target area where the erasing objects act on the liquid crystal writing board (10) in real time according to the electromagnetic induction intensity;
judging whether the range of the target area coordinate reaches a preset erasing area parameter and whether the real-time pressure feeling reaches a preset erasing pressure feeling value,
if it is
Erasing the writing trace on the target area coordinate on the liquid crystal writing board (10).
2. The method of locally erasing a liquid crystal tablet of claim 1,
the erasing area parameter is determined based on the erasing surface parameter of the electromagnetic board eraser (20) used with the liquid crystal writing board (10).
3. The partial erasing method of a liquid crystal tablet as claimed in claim 2,
determining a shape parameter based on a shape of an erasing surface of the electromagnetic board eraser (20);
determining a dimension parameter based on a dimension of an erasing surface of the electromagnetic board eraser (20);
determining the erasing area parameter based on the shape parameter and the size parameter.
4. The method of claim 3 wherein the parameters of the erased area are determined according to the shape parameters, the size parameters and the customized correction factors.
5. The local erasing system of the liquid crystal writing board comprises the liquid crystal writing board (10), wherein the liquid crystal writing board (10) is provided with a handwriting film (11) and a first coil array (13) which can display handwriting in real time, the local erasing system is characterized by further comprising an electromagnetic board eraser (20), the electromagnetic board eraser (20) is provided with a second coil array (21) which can perform electromagnetic induction with the first coil array (13), the liquid crystal writing board (10) is provided with a processing unit (12), the processing unit (12) can determine a target area coordinate and a real-time pressure sensation acted on the liquid crystal writing board (10) by the electromagnetic board eraser (20) according to the electromagnetic induction intensity between the second coil array (21) and the first coil array (13), when the range of the target area coordinate reaches a preset erasing area parameter and the real-time pressure sensation reaches a preset erasing pressure sensation value, the processing unit (12) controls the handwriting film (11) to erase the writing trace on the target area coordinate.
6. The local erasing system of the liquid crystal writing board of claim 5, wherein the electromagnetic eraser (20) is provided with an erasing surface, and the erasing area parameter is determined according to the parameter of the erasing surface of the electromagnetic eraser (20).
7. The local erase system for a liquid crystal tablet of claim 6, wherein the parameters of the erase surface include:
a shape parameter determined based on a shape of an erasing surface of the electromagnetic board eraser (20);
the size parameter is determined based on the size of the erasing surface of the electromagnetic board eraser (20).
8. The liquid crystal tablet local erasure system of claim 6,
the erasing area parameter is determined according to the shape parameter, the size parameter and the self-defined correction coefficient.
9. The liquid crystal tablet local erase system of claim 5, wherein the processing unit includes:
the calculation unit is used for determining the coordinates and real-time pressure of the target area according to the electromagnetic induction intensity between the first coil array and the second coil array;
an erasing area comparing unit for comparing the range of the target area coordinates with the erasing area parameters;
and the pressure-sensitive comparison unit is used for comparing the real-time pressure sensitivity with the erasing pressure sensitivity value.
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Application publication date: 20210706 |