Method and system for adjusting erasing voltage of liquid crystal writing device

Abstract

The invention discloses a liquid crystal writing device erasing voltage adjusting method and system. The method comprises the steps that a first adjusting area, a second adjusting area, a third adjusting area and a fourth adjusting area are defined on a liquid crystal writing device; wherein the first adjusting area and the third adjusting area are located on different sides of the liquid crystal writing device, and the second adjusting area and the fourth adjusting area are located on different sides of the liquid crystal writing device; when the erasing voltage needs to be increased, respectively executing a preset first operation in the first adjusting area and the third adjusting area at the same time; if the requirement is met, triggering and controlling the erasure voltage to increase delta U; when the erasing voltage needs to be reduced, respectively executing a preset second operation in the second adjustment area and the fourth adjustment area at the same time; if the requirement is met, the erasure voltage is triggered and controlled to be reduced by delta U. According to the invention, the required voltage value can be accurately adjusted, and both the adjusting speed and the adjusting precision are considered.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid crystal writing device, and particularly relates to a liquid crystal writing device erasing voltage adjustment method and system. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute the prior art.

[0003] The working principle of the liquid crystal writing device is often to record the writing pressure trajectory of the writing pen by the pressure acting on the liquid crystal writing board, to change the bistable liquid crystal (such as cholesteric liquid crystal) structure by applying a set electric field, and to make the writing pressure trajectory disappear to realize erasing.

[0004] However, it is found in actual application that the erasing voltage of the liquid crystal writing device may change with the influence of factors such as environmental temperature and aging degree of the liquid crystal; for example, within the normal use range of-10°C to 40°C, when the environmental temperature rises, the erasing voltage required by the liquid crystal will decrease, and when the environmental temperature decreases, the erasing voltage required by the liquid crystal will increase; in addition, the longer the liquid crystal is used, the higher the required erasing voltage will be.

[0005] Therefore, the liquid crystal writing device may have an inappropriate erasing voltage during use: if the erasing voltage is too low, the writing may not be completely erased; if the erasing voltage is too high, the content outside the erasing area may also become dim or be erased together.

[0006] In the prior art, the erasing voltage adjustment is often triggered by performing a setting action at a set position of the writing device by using an eraser or a palm, so that the liquid crystal writing device makes one adjustment (increases or decreases the erasing voltage) to the erasing voltage; since the step length of each voltage adjustment is a fixed value, if the step length is set too large, the appropriate erasing voltage cannot be accurately adjusted; if the step length is set too small, the adjustment speed will be affected.

[0007] Moreover, the existing erasing voltage adjustment action is completed on one side of the writing board, which is easy to cause misadjustment of the erasing voltage due to accidental touch by the user. SUMMARY

[0008] In order to solve the above problems, the present application provides a liquid crystal writing device erasing voltage adjustment method and system, which takes into account the requirements of adjustment speed and adjustment accuracy, can accurately adjust the erasing voltage, and can avoid accidental triggering.

[0009] In some embodiments, the following technical solutions are adopted: A liquid crystal writing device erasing voltage adjustment method, comprising: The first adjusting area, the second adjusting area, the third adjusting area and the fourth adjusting area are respectively demarcated on the liquid crystal writing device; wherein the first adjusting area and the third adjusting area are on different sides of the liquid crystal writing device, and the second adjusting area and the fourth adjusting area are on different sides of the liquid crystal writing device. When the erasing voltage needs to be increased, the predetermined first operation is simultaneously performed in the first adjusting area and the third adjusting area respectively; the liquid crystal writing device detects the operation execution condition, and if the requirement is met, the control of increasing the erasing voltage by ΔU is triggered; otherwise, no action is triggered. When the erasing voltage needs to be reduced, the predetermined second operation is simultaneously performed in the second adjusting area and the fourth adjusting area respectively; the liquid crystal writing device detects the operation execution condition, and if the requirement is met, the control of reducing the erasing voltage by ΔU is triggered; otherwise, no action is triggered.

[0010] As a further scheme, after the erasing voltage is increased at least once, if the erasing voltage is too high at this time and needs to be reduced, when the erasing voltage is reduced for the first time, the predetermined second operation is simultaneously performed in the second adjusting area and the fourth adjusting area respectively; the liquid crystal writing device detects the operation execution condition, and if the requirement is met, the control of reducing the erasing voltage by ΔU / 2 is triggered; if the erasing voltage needs to be continuously reduced, the control of reducing the erasing voltage by ΔU is triggered each time.

[0011] As a further scheme, after the erasing voltage is reduced at least once, if the erasing voltage is too low at this time and needs to be increased, when the erasing voltage is increased for the first time, the predetermined first operation is simultaneously performed in the first adjusting area and the third adjusting area respectively; the liquid crystal writing device detects the operation execution condition, and if the requirement is met, the control of increasing the erasing voltage by ΔU / 2 is triggered; if the erasing voltage needs to be continuously increased, the control of increasing the erasing voltage by ΔU is triggered each time.

[0012] As a further scheme, the first adjusting area, the second adjusting area, the third adjusting area and the fourth adjusting area respectively correspond to the upper left corner, the upper right corner, the lower right corner and the lower left corner of the liquid crystal writing device; and the coordinate ranges of the areas are demarcated.

[0013] As a further scheme, the first operation and the second operation are the same or different.

[0014] As a further scheme, the erasing voltage is a local erasing voltage or a one-key full erasing voltage; when the local erasing voltage and the one-key full erasing voltage are adjusted, the operations performed are different.

[0015] As a further scheme, when the local erasing voltage is adjusted, the first operation is that n contact points of a set size simultaneously approach or contact the surface of the writing device; or n fingers simultaneously approach or contact the surface of the writing device. When the all-erase voltage is adjusted, the first operation is that m contact points of a certain size are simultaneously close to or contact the surface of the writing device; or m fingers are simultaneously close to or contact the surface of the writing device; n≠m, and 2≤n≤5, 2≤m≤5.

[0016] As a further solution, the liquid crystal writing device detects operation execution, specifically: The liquid crystal writing device detects the operation type and operation execution time in each adjustment area; based on the operation type and the adjustment area where the operation is located, the increase or decrease of the erase voltage is triggered.

[0017] In other embodiments, the following technical solutions are adopted: A liquid crystal writing device erase voltage adjustment system comprises: A detection unit is configured to detect operation execution in each adjustment area and feed back the detection result to the master control unit; The master control unit is configured to determine whether the erase voltage adjustment condition is met according to the received detection result, and if so, issue a voltage adjustment instruction to adjust the erase voltage according to a preset logic; if not, no action is triggered; A voltage generation circuit is configured to generate a corresponding voltage according to the voltage adjustment instruction of the master control unit; An indication unit is configured to indicate whether the current gesture voltage adjustment operation is successfully executed.

[0018] As a further solution, the detection unit is a positioning device arranged on the liquid crystal writing device, and the positioning device is any one of infrared positioning, capacitive positioning, optical camera positioning, or laser radar positioning.

[0019] In other embodiments, the following technical solutions are adopted: A liquid crystal writing device erase voltage adjustment method comprises: A plurality of local erase test areas are demarcated at predetermined positions of the liquid crystal writing device, and a set distance is provided between two adjacent local erase test areas; A writing operation is performed on each local erase test area and its surrounding non-test area; In response to a trigger instruction for adjusting the erase voltage, each local erase test area is sequentially erased in a preset erase order; the erase effect of each local erase test area is judged, and the erase voltage corresponding to the local erase test area whose erase effect meets the predetermined requirement is selected as the adjusted erase voltage; Wherein, the erase voltages applied to each local erase test area are different from each other within a preset range.

[0020] In other embodiments, the following technical solutions are adopted: A liquid crystal writing device erasing voltage adjustment method, comprising: A plurality of local erasing test areas are demarcated at predetermined positions of the liquid crystal writing device, and a set distance is provided between two adjacent local erasing test areas. A writing operation is performed on each local erasing test area and the non-test area around it. In response to a trigger instruction for adjusting the erasing voltage, each local erasing test area is erased in a preset erasing order until a local erasing test area with a selected erasing effect meeting a predetermined requirement is found, and the erasing voltage corresponding to the local erasing test area is taken as the adjusted erasing voltage. In the erasing of the local erasing test areas in the erasing order, the erasing voltage applied to each local erasing test area is increased in a preset range.

[0021] As a further solution, a plurality of local erasing test areas are demarcated at predetermined positions of the liquid crystal writing device, specifically: In the range of the local erasing voltage of the liquid crystal writing device, a plurality of different erasing voltages are divided, and each erasing voltage corresponds to a local erasing test area. When the local erasing test area is erased, the corresponding erasing voltage is applied.

[0022] As a further solution, the local erasing test areas are arranged in sequence along the horizontal or vertical direction of the liquid crystal writing device, and a set distance is provided between two adjacent local erasing test areas.

[0023] As a further solution, the trigger instruction for adjusting the erasing voltage is triggered by a button on the liquid crystal writing device, or by a set gesture or action performed at a set position of the liquid crystal writing device, or by the controller.

[0024] As a further solution, the way of selecting the local erasing test area with the erasing effect meeting the predetermined requirement is that a predetermined gesture or action is performed on the local erasing test area with the erasing effect meeting the predetermined requirement.

[0025] In other embodiments, the following technical solutions are adopted: A liquid crystal writing device erasing voltage adjustment system, comprising: A master control unit configured to control the erasing of each local erasing test area in a preset erasing order in response to a trigger instruction for adjusting the erasing voltage, and to select the erasing voltage corresponding to a local erasing test area with an erasing effect meeting a predetermined requirement as the adjusted erasing voltage. A plurality of local erasing test regions are demarcated at predetermined positions of the liquid crystal writing device, and a set distance is provided between two adjacent local erasing test regions.

[0026] In some other embodiments, the technical solutions are as follows: The liquid crystal writing device erasing voltage adjustment system comprises: The main control unit is configured to, after receiving a trigger instruction for adjusting the erasing voltage, sequentially control erasing of each local erasing test region according to a preset erasing sequence until a local erasing test region with a selected erasing effect meeting a predetermined requirement is obtained, and take the erasing voltage corresponding to the local erasing test region as the adjusted erasing voltage. A plurality of local erasing test regions are demarcated at predetermined positions of the liquid crystal writing device, and a set distance is provided between two adjacent local erasing test regions.

[0027] Compared with the prior art, the present application has the following advantages: (1) The present application demarcates a plurality of adjustment regions on the liquid crystal writing device, and when a set operation is performed in the two adjustment regions at the same time, the adjustment of the increase or decrease of the erasing voltage is triggered. When the erasing voltage is increased or decreased to a certain value and then is adjusted in the opposite direction, the first voltage adjustment step is reduced to half of the original value, and the subsequent adjustment is restored to the original value.

[0028] (2) The present application demarcates a plurality of local erasing test regions in advance, and then sequentially and automatically performs the erasing operation on each test region according to the corresponding erasing voltage.

[0029] Other features and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 The flow chart of the liquid crystal writing device erasing voltage adjustment method in the embodiments of the present application is shown in the figure. Figure 2A schematic diagram of the adjustment region division on the liquid crystal writing device in the embodiment of the present application; Figure 3 A schematic diagram of the adjustment gesture for controlling the increase of the partial erasing voltage in the embodiment of the present application; Figure 4 A schematic diagram of the adjustment gesture for controlling the increase of the one-key full erasing voltage in the embodiment of the present application; Figure 5 A schematic diagram of the erasing voltage adjustment system structure of the liquid crystal writing device in the embodiment of the present application; Figure 6 A schematic diagram of the partial erasing test region setting mode in the embodiment of the present application. DETAILED DESCRIPTION

[0031] It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the present application. Unless otherwise defined, 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.

[0032] It should be noted that the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a presence of the features, steps, operations, devices, components and / or combinations thereof.

[0033] Embodiment One In one or more embodiments, a liquid crystal writing device erasing voltage adjustment method is disclosed, and the present embodiment is directed to adjusting the partial erasing voltage of the liquid crystal writing device. The partial erasing voltage refers to the voltage difference formed between the two conductive layers corresponding to the partial erasing region. When performing partial erasing, different voltage differences (electric fields) are formed in different regions of the liquid crystal writing device by applying voltage; the voltage difference formed in the erasing region can make the liquid crystal in this region become a focal conic state, so that the content in this region is erased; while the voltage difference formed in the non-erasing region cannot change the state of the corresponding liquid crystal, so that the content in these regions will not be erased or faded.

[0034] In combination Figure 1 , the specific erasing voltage adjustment method includes the following processes: First, the first adjustment region, the second adjustment region, the third adjustment region and the fourth adjustment region are respectively demarcated on the liquid crystal writing device; wherein the first adjustment region and the third adjustment region are on different sides of the liquid crystal writing device, and the second adjustment region and the fourth adjustment region are on different sides of the liquid crystal writing device.

[0035] The adjustment area should be selected from an area that is not frequently used in daily life. As a specific example, in combination with Figure 2 The first adjustment area, the second adjustment area, the third adjustment area, and the fourth adjustment area are respectively arranged in the upper left corner, the upper right corner, the lower right corner, and the lower left corner of the liquid crystal writing device. The coordinate ranges of the areas (i.e., the sizes of the areas) can be determined according to actual needs, for example, the width and height of each corner can be set to one sixth of the width and height of the blackboard.

[0036] It should be noted that the present application does not limit the specific positions of the adjustment areas. For example, the first adjustment area can also be arranged in the upper right corner, and the second adjustment area can also be arranged in the upper left corner. Alternatively, the first adjustment area can also be arranged at a position close to the top or the bottom on one side, and so on. It is only required that the first adjustment area and the third adjustment area are located on different sides of the liquid crystal writing device, and the second adjustment area and the fourth adjustment area are located on different sides of the liquid crystal writing device.

[0037] For the adjustment of the local erasing voltage, the following two cases can be considered: (1) If the liquid crystal writing device is executed for local erasing, and the erasing is not clean, it indicates that the current local erasing voltage is too small, and the erasing voltage needs to be increased. At this time, the predetermined first operation is simultaneously executed in the first adjustment area and the third adjustment area. The liquid crystal writing device detects the operation execution condition. If the requirement is met, the control of increasing the erasing voltage by ΔU is triggered. Otherwise, the voltage adjustment is not triggered.

[0038] The first operation can be that n set-size contacts simultaneously approach or contact the surface of the writing device, or n fingers simultaneously approach or contact the surface of the writing device. For example, the first operation can be that two fingers simultaneously approach or contact the surface of the writing device.

[0039] The detection of the operation execution condition by the liquid crystal writing device refers to the judgment of whether the predetermined first operation is simultaneously executed in the first adjustment area and the third adjustment area and lasts for a certain time (for example, 2s). If the above conditions are met, the voltage adjustment (i.e., the control of increasing the erasing voltage by ΔU) is triggered.

[0040] The following takes the first operation as an example, that is, two fingers simultaneously approach or contact the surface of the writing device. The left two fingers are placed in the first adjustment area at the upper left corner of the blackboard, and the right two fingers are placed in the third adjustment area at the lower right corner of the blackboard, as shown in Figure 3 After staying for more than a set time (for example, 2s) and leaving, the control of increasing the erasing voltage by ΔU can be triggered.

[0041] After the voltage adjustment, the liquid crystal writing device indicates by a light or voice that the current gesture voltage adjustment operation has been performed; the liquid crystal writing device performs a partial erasing operation, and judges the partial erasing effect. If the partial erasing effect is still not good, the partial erasing voltage needs to be continuously increased by repeating the above adjustment process. If the content of the non-erasing area is also erased or the handwriting is lightened, it means that the partial erasing voltage is too high, and thus a reverse voltage adjustment, i.e., reducing the partial erasing voltage, needs to be performed.

[0042] When the reverse voltage adjustment is performed, the predetermined second operation is simultaneously performed in the second adjustment area and the fourth adjustment area. When the first reverse voltage adjustment is performed, the liquid crystal writing device detects the operation execution condition (i.e., whether the predetermined second operation is simultaneously performed in the second adjustment area and the fourth adjustment area and lasts for a certain time). If the condition is met, the control of reducing the erasing voltage by ΔU / 2 is triggered. If the content of the non-erasing area is still erased or the handwriting is lightened after the first reverse voltage adjustment, it means that the erasing voltage is still too high, and thus the erasing voltage needs to be continuously reduced. At this time, the predetermined second operation is simultaneously performed in the second adjustment area and the fourth adjustment area, and the liquid crystal writing device detects the operation execution condition. If the condition is met, the control of reducing the erasing voltage by ΔU is triggered. If the erasing voltage still needs to be reduced, the voltage step of each adjustment is ΔU.

[0043] As a specific example, the setting of ΔU is 2V, and it is assumed that the current erasing voltage is 20V and the required erasing voltage is 29V, and thus the erasing effect is not good. The erasing voltage is increased by 2V each time. After 5 adjustments, the erasing voltage is adjusted to 30V. At this time, the erasing voltage is too high, and thus the content of the non-erasing area is also erased or the handwriting is lightened, and then the erasing voltage needs to be adjusted in the reverse direction, i.e., reduced. When the first reverse voltage adjustment is performed, the erasing voltage is reduced by 1V. At this time, the required erasing voltage 29V is obtained. After 6 adjustments, the erasing voltage is adjusted to 32V. At this time, the erasing voltage is too high, and thus the content of the non-erasing area is also erased or the handwriting is lightened, and then the erasing voltage needs to be adjusted in the reverse direction, i.e., reduced. When the first reverse voltage adjustment is performed, the erasing voltage is reduced by 1V, and the erasing voltage becomes 31V. When the erasing voltage is reduced again, the erasing voltage is reduced by 2V each time. After one reverse voltage adjustment, the required erasing voltage 29V is obtained. In this way, the voltage can be accurately adjusted to the required voltage, which can avoid that the adjustment step is too large and the required voltage cannot be accurately adjusted, and the efficiency of the voltage adjustment is also considered.

[0044] If the current partial voltage is appropriate (neither the erasing effect is not good nor the non-erasing area is affected) by performing the partial erasing operation on the liquid crystal writing device, the voltage adjustment process can be stopped.

[0045] (2) If the traces in the non-erasing area become dim or disappear when the partial erasing is performed on the liquid crystal writing device, it means that the current partial erasing voltage is too large, and the erasing voltage needs to be reduced. At this time, the predetermined second operation is performed simultaneously in the second adjustment area and the fourth adjustment area. The liquid crystal writing device detects the operation execution condition. If the requirement is met, the control erasing voltage is reduced by ΔU. Otherwise, the voltage adjustment is not triggered.

[0046] It should be noted that the second operation can be the same as the first operation, such as: both are two fingers close to or contact the surface of the writing device at the same time. Of course, the second operation can also be different from the first operation, such as: the first operation is three fingers close to or contact the surface of the writing device, and the second operation is two fingers close to or contact the surface of the writing device at the same time.

[0047] The liquid crystal writing device detects the operation execution condition, which means to determine whether the second operation is performed simultaneously in the second adjustment area and the fourth adjustment area and lasts for a certain time (such as 2s). If the requirement is met, the control erasing voltage is reduced.

[0048] The following is an example where both the first operation and the second operation are two fingers close to or contact the surface of the writing device at the same time: the left two fingers are placed in the fourth adjustment area at the lower left corner of the blackboard, and the right two fingers are placed in the second adjustment area at the upper right corner of the blackboard. After staying for more than a set time (such as 2s), they are removed. At this time, the control erasing voltage can be reduced by ΔU, which can be set to 2V as a specific example.

[0049] After the voltage adjustment, the liquid crystal writing device will indicate with a light or voice that the current gesture voltage adjustment operation has been performed. The partial erasing effect is judged when the partial erasing operation is performed on the liquid crystal writing device. If the traces in the non-erasing area still become dim or disappear, the partial erasing voltage needs to be reduced repeatedly. If the content in the erasing area is not clean, it means that the partial erasing voltage is too low, and the reverse voltage adjustment needs to be performed, i.e. the partial erasing voltage needs to be increased.

[0050] When the first reverse voltage adjustment is performed, the predetermined first operation is performed simultaneously in the first adjustment area and the third adjustment area. The liquid crystal writing device detects the operation execution condition. If the requirement is met, the control erasing voltage is increased by ΔU / 2. If the erasing voltage is still too low, the erasing voltage is continuously increased by ΔU in the subsequent adjustment.

[0051] Similarly, when the reverse voltage adjustment is performed, the first adjustment voltage step is half of the forward voltage adjustment, and the subsequent adjustment voltage step is the same as the forward voltage adjustment. This can avoid the adjustment step being too large to accurately adjust to the required voltage value, and also consider the efficiency of voltage adjustment.

[0052] If the current partial voltage is judged to be appropriate by performing the partial erasing action, the adjustment process can be stopped.

[0053] In the embodiment, two hands are needed to operate the writing device at different sides at the same time when adjusting the partial erasing voltage, which can be obviously distinguished from the daily use actions and avoid false triggering.

[0054] Embodiment Two In one or more embodiments, a liquid crystal writing device erasing voltage adjustment method is disclosed, and the embodiment is directed to adjusting the one-key full erasing voltage of the liquid crystal writing device. The one-key full erasing voltage specifically refers to applying a predetermined voltage to the entire area of the upper and lower conductive layers of the liquid crystal writing device when the one-key full erasing button is triggered, and the voltage difference between the two conductive layers can make the liquid crystal in the middle liquid crystal layer become a focal conic state, thereby realizing full erasing of all contents on the liquid crystal writing device.

[0055] The specific voltage adjustment process is basically the same as that in Embodiment One, that is, when the one-key full erasing is performed, if it is found that the erasing is not clean, it means that the erasing voltage is too low, and the one-key full erasing voltage is controlled to be increased; if the screen of the writing device flickers during erasing, it means that the erasing voltage is too high, and the one-key full erasing voltage is controlled to be reduced.

[0056] The specific control method of increasing or reducing the erasing voltage is the same as that in Embodiment One, and the main difference lies in that the first operation or the second operation is different from the operation mode when adjusting the partial erasing voltage.

[0057] Specifically, when adjusting the partial erasing voltage, the first operation is that n contact points of a certain size are simultaneously close to or contact the surface of the writing device; or n fingers are simultaneously close to or contact the surface of the writing device. When adjusting the one-key full erasing voltage, the first operation is that m contact points of a certain size are simultaneously close to or contact the surface of the writing device; or m fingers are simultaneously close to or contact the surface of the writing device; n≠m, and 2≤n≤5, 2≤m≤5.

[0058] When the liquid crystal writing device has both partial erasing and one-key full erasing functions, the adjustment of the partial erasing voltage or the adjustment of the one-key full erasing voltage can be determined by the specific operation performed, for example: if it is detected that the operation performed is that two fingers are simultaneously close to or contact the surface of the writing device, it is judged that the partial erasing voltage is adjusted; if it is detected that the operation performed is that three or four fingers are simultaneously close to or contact the surface of the writing device, it is judged that the one-key full erasing voltage is adjusted. Figure 4The adjustment gesture schematic diagram for controlling the voltage reduction of the one-key full-erasing is shown, three fingers of the left hand are placed in the fourth adjustment area at the lower left corner of the blackboard, and three fingers of the right hand are placed in the second adjustment area at the upper right corner of the blackboard.

[0059] The parts not mentioned in this embodiment are the same as in Embodiment One and will not be described in detail.

[0060] Embodiment Three In one or more embodiments, a liquid crystal writing device erasing voltage adjustment system is disclosed, which is combined with Figure 5 , and specifically includes: (1) a detection unit for detecting the operation situation performed in each adjustment area and feeding back the detection result to the master control unit.

[0061] The detection unit of the present embodiment is a positioning device arranged on the liquid crystal writing device, which can be any one of infrared positioning, capacitive positioning, optical camera positioning or laser radar positioning. The specific installation position of the positioning device can be obtained by those skilled in the art according to the prior art, and will not be described in detail.

[0062] (2) a master control unit for judging whether the erasing voltage adjustment condition is met according to the received detection result, and if so, issuing a voltage adjustment instruction to adjust the erasing voltage according to the preset logic; if not, no voltage adjustment is triggered.

[0063] The master control unit of the present embodiment is the control center of the liquid crystal writing device, which can receive the detection result of the detection unit, and judge what adjustment is made to the erasing voltage according to the detection result (including the position of the operation, the type of the operation and the execution time of the operation, etc.); then control the voltage generation circuit to generate the corresponding voltage according to the judgment result.

[0064] (3) a voltage generation circuit for generating a corresponding voltage according to the voltage adjustment instruction of the master control unit; the generated voltage is applied to each conductive layer through the liquid crystal driving chip inside the device.

[0065] It should be noted that the specific implementation of the voltage generation circuit generating a corresponding voltage according to the voltage adjustment instruction and applying a voltage to each conductive layer through the liquid crystal driving chip is easy to implement by the prior art, and therefore will not be described in detail.

[0066] (4) an indication unit for indicating whether the current gesture voltage adjustment operation is successfully executed.

[0067] The indication unit of the embodiment can be in various forms such as LED indicator light or buzzer sound prompt. For example, if the increase of the erase voltage is successfully performed, a green light is blinked to prompt; if the decrease of the erase voltage is successfully performed, a red light is blinked to prompt, which is used to prompt that the current erase voltage adjustment is successful. Alternatively, if the increase of the erase voltage is successfully performed, a buzzer sounds a long tone to prompt; if the decrease of the erase voltage is successfully performed, a buzzer sounds a short tone to prompt, and so on.

[0068] It should be noted that the liquid crystal writing device structure of the embodiment includes two conductive layers and a bistable liquid crystal layer arranged between the two conductive layers; wherein the two conductive layers can be two transparent conductive film layers ITO; each conductive layer is divided into a plurality of parallel and insulated conductive regions, and each conductive region can be applied with a voltage; alternatively, the two conductive layers can be a transparent conductive film layer ITO on the top and a TFT structure conductive layer on the bottom, and the TFT structure conductive layer is divided into a plurality of pixel units, and each pixel unit can be loaded with a voltage.

[0069] Embodiment Four The erase voltage adjustment method of the liquid crystal writing device disclosed in the above embodiment one or embodiment two takes into account the requirements of adjustment speed and adjustment accuracy, can realize accurate adjustment of the erase voltage, and can avoid false triggering. However, each time the erase voltage is adjusted, the operator needs to perform a predetermined operation, and the automatic adjustment of the erase voltage cannot be realized.

[0070] Therefore, in one or more embodiments, a liquid crystal writing device erase voltage adjustment method is disclosed, which specifically includes the following processes: (1) First, a plurality of local erase test regions are demarcated at predetermined positions of the liquid crystal writing device, and a set distance is provided between two adjacent local erase test regions.

[0071] In the embodiment, a plurality of different erase voltages are divided within the local erase voltage range of the liquid crystal writing device, and each erase voltage corresponds to a local erase test region. Specifically, the erase voltage range of the liquid crystal writing device is usually between 20V-40V, and then an erase voltage can be selected every 2V, so that 10 local erase test regions can be divided, and their corresponding erase voltages are 20V, 22V, 24V, 26V, 28V, 30V, 32V, 34V, 36V, 38V, and 40V.

[0072] Of course, an erase voltage can also be selected every 1V or every 3V, and the number of corresponding local erase test regions will also change accordingly. The specific interval voltage can be selected according to actual needs; the smaller the interval voltage, the higher the adjustment accuracy of the erase voltage.

[0073] The erasing voltage corresponding to each partial erasing test area is preset and stored in the master control unit in the device, or can be called by the master control unit.

[0074] For convenience, the partial erasing test areas are arranged in sequence along the horizontal or vertical direction of the liquid crystal writing device, and a distance is set between two adjacent partial erasing test areas. The size of each partial erasing test area is selected according to actual conditions, so as to be distributed in the same row or column as much as possible.

[0075] As a specific example, in combination with Figure 6 , 10 partial erasing test areas are arranged in sequence along the horizontal direction above the liquid crystal writing device, and the corresponding erasing voltage of each partial erasing test area is increased by 2V from left to right.

[0076] (2) Before adjusting the erasing voltage of the liquid crystal writing device, writing operation needs to be performed on each partial erasing test area and its surrounding non-test area, that is, writing is performed on the partial erasing test area and its surrounding non-test area, so that these areas display writing traces. As an example, if the partial erasing test areas are arranged in sequence along the horizontal direction, several straight lines (such as the green straight lines in Figure 6 ) or curves that pass through these test areas can be drawn, so that the test areas and their surrounding non-test areas have display traces. Of course, other writing operation modes can also be used, as long as each partial erasing test area and its surrounding non-test area can display writing traces, so that when erasing action is performed on a partial erasing test area, it can be clearly observed whether the traces in the partial erasing test area are completely erased, and whether the traces in the surrounding area are affected and become dim or disappear.

[0077] (3) Trigger the erasing voltage adjustment instruction and perform the erasing voltage adjustment process.

[0078] In this embodiment, the trigger instruction for adjusting the erasing voltage can be triggered by a certain setting button on the liquid crystal writing device; or, a setting gesture or action can be performed at a set position of the liquid crystal writing device to trigger; for example, the operation gesture shown in Figure 3 or Figure 4 can be used to trigger, or other gestures or actions can be used to trigger according to actual needs; or, the controller can be triggered by a controller, which can be a separate external control terminal.

[0079] (4) The process of performing the erasing voltage adjustment is specifically: erasing each local erasing test area in turn according to a preset erasing order; for example, erasing each local erasing test area from left to right in turn, or erasing each local erasing test area in another order; when erasing each local erasing test area, the erasing voltage corresponding to the local erasing test area is applied.

[0080] After the last local erasing test area is erased according to the corresponding erasing voltage, a certain time interval (for example, 100 milliseconds) is provided, and then the next local erasing test area is erased.

[0081] After all the local erasing test areas are erased according to the corresponding erasing voltages, the erasing effect of each local erasing test area is judged by an operator, and a local erasing test area in which the writing is completely erased and the writing in the surrounding area is not affected and becomes light or disappears is selected, and the erasing voltage corresponding to the local erasing test area is selected as the adjusted erasing voltage. If multiple local erasing test areas meet the requirements, the erasing voltage with a higher value is preferably selected to improve the erasing speed.

[0082] In this embodiment, the selection of the local erasing test area with the erasing effect meeting the predetermined requirements is specifically: a predetermined gesture or action is performed on the local erasing test area with the erasing effect meeting the predetermined requirements; for example, when a set gesture is detected to stay at a certain local erasing test area for a set time (for example, 3 seconds) or repeated clicking at a certain local erasing test area for 3 times is detected, it is considered that the local erasing test area is selected, and the main control unit in the device will take the erasing voltage corresponding to the local erasing test area as the adjusted erasing voltage.

[0083] As an optional implementation, the current erasing voltage can also be displayed on some liquid crystal writing devices.

[0084] It should be noted that the gestures or actions involved in this embodiment can be detected by a positioning device arranged on the liquid crystal writing device and fed back to the main control unit; the positioning device can be any one of infrared positioning, capacitive positioning, optical camera positioning, or laser radar positioning.

[0085] The liquid crystal writing device erasing voltage adjustment method of this embodiment can further improve the adjustment efficiency of the erasing voltage by predefining multiple local erasing test areas, then automatically erasing each test area according to the corresponding erasing voltage, and selecting the best erasing voltage according to the erasing effect of each local erasing test area; without repeated operation by the operator.

[0086] Embodiment five In one or more embodiments, a liquid crystal writing device erasing voltage adjustment method is disclosed. The difference between the method of the present embodiment and the method of embodiment four is that the process of performing erasing voltage adjustment is different.

[0087] The process of performing erasing voltage adjustment in the present embodiment is as follows: each local erasing test area is sequentially erased according to a preset erasing order; when each local erasing test area is erased according to the erasing order, the erasing voltage applied to each local erasing test area is sequentially increased within a preset range; that is, the erasing order of each local erasing test area is sorted according to the order of erasing voltage from small to large, for example: first, the local erasing test area with an erasing voltage of 20V is erased, after the erasing is completed, after a certain time (for example, 300 milliseconds), the local erasing test area with an erasing voltage of 22V is erased, and so on.

[0088] During the process of performing local erasing, if it is found that the erasing effect of a certain local erasing test area meets the requirements: the handwriting of the local erasing test area is completely erased, and the handwriting of the surrounding area is not affected and becomes light or disappears; then the local erasing test area can be directly selected, and the process is terminated, without continuing the erasing process of the subsequent local erasing test area, further saving the adjustment time.

[0089] The main control unit inside the device will take the erasing voltage corresponding to the local erasing test area as the adjusted erasing voltage.

[0090] The parts not mentioned in the present embodiment are the same as those in embodiment four and will not be described in detail.

[0091] Embodiment six In one or more embodiments, a liquid crystal writing device erasing voltage adjustment system is disclosed, which is used to implement the liquid crystal writing device erasing voltage adjustment method in embodiment four, and comprises: a main control unit, which is configured to sequentially control the erasing of each local erasing test area according to a preset erasing order after receiving a trigger instruction for adjusting the erasing voltage; judge the erasing effect of each local erasing test area, and select the erasing voltage corresponding to the local erasing test area with an erasing effect meeting the predetermined requirements as the adjusted erasing voltage; wherein a plurality of local erasing test areas are demarcated at predetermined positions of the liquid crystal writing device, and a set distance is provided between two adjacent local erasing test areas; the erasing voltage applied to each local erasing test area is different from each other within a preset range.

[0092] In some other embodiments, a liquid crystal writing device erasing voltage adjustment system is disclosed for implementing the liquid crystal writing device erasing voltage adjustment method in Embodiment Five, comprising: a master control unit configured to, after receiving a trigger instruction for adjusting the erasing voltage, sequentially control erasing each local erasing test area according to a preset erasing sequence until a local erasing test area with a selected erasing effect meeting a predetermined requirement is found; and taking the erasing voltage corresponding to the local erasing test area as the adjusted erasing voltage. wherein a plurality of local erasing test areas are demarcated at predetermined positions of the liquid crystal writing device, and a set distance is provided between any two adjacent local erasing test areas; and when erasing each local erasing test area according to the erasing sequence, the erasing voltage applied to each local erasing test area is sequentially increased within a preset range.

[0093] The above description of the specific embodiments of the present application in conjunction with the accompanying drawings is not intended to limit the scope of protection of the present application. Those skilled in the art should understand that various modifications or variations can be made to the technical solutions of the present application without requiring creative labor, and such modifications or variations are still within the scope of protection of the present application.

Claims

1. A method for adjusting an erase voltage of a liquid crystal writing device, characterized by, The method comprises the following steps: First, second, third and fourth adjustment regions are respectively demarcated on the liquid crystal writing device; the first and third adjustment regions are on different sides of the liquid crystal writing device, and the second and fourth adjustment regions are on different sides of the liquid crystal writing device; When it is necessary to increase the erasing voltage, predetermined first operations are simultaneously performed in the first and third adjustment regions; the liquid crystal writing device detects the operation execution condition, and triggers control of increasing the erasing voltage by ΔU if the condition is met; otherwise, no action is triggered; When it is necessary to decrease the erasing voltage, predetermined second operations are simultaneously performed in the second and fourth adjustment regions; the liquid crystal writing device detects the operation execution condition, and triggers control of decreasing the erasing voltage by ΔU if the condition is met; otherwise, no action is triggered.

2. The method of claim 1, wherein the voltage is adjusted by a voltage adjustment circuit. After the erasing voltage is increased at least once, if the erasing voltage is too high at this time and it is necessary to decrease the erasing voltage, predetermined second operations are simultaneously performed in the second and fourth adjustment regions when the erasing voltage is decreased for the first time; the liquid crystal writing device detects the operation execution condition, and triggers control of decreasing the erasing voltage by ΔU / 2 if the condition is met; if it is necessary to continue to decrease the erasing voltage, the liquid crystal writing device triggers control of decreasing the erasing voltage by ΔU each time.

3. The method of claim 1, wherein the voltage is adjusted by a voltage adjustment circuit. After the erasing voltage is decreased at least once, if the erasing voltage is too low at this time and it is necessary to increase the erasing voltage, predetermined first operations are simultaneously performed in the first and third adjustment regions when the erasing voltage is increased for the first time; the liquid crystal writing device detects the operation execution condition, and triggers control of increasing the erasing voltage by ΔU / 2 if the condition is met; if it is necessary to continue to increase the erasing voltage, the liquid crystal writing device triggers control of increasing the erasing voltage by ΔU each time.

4. The method of claim 1, wherein the voltage is adjusted by a voltage adjustment circuit. The first, second, third and fourth adjustment regions correspond to the upper left corner, the upper right corner, the lower right corner and the lower left corner of the liquid crystal writing device respectively; and the coordinate ranges of the regions are demarcated.

5. The method of claim 1, wherein the voltage is adjusted by a voltage adjustment circuit. The first and second operations are the same or different.

6. The method of claim 1, wherein the voltage is adjusted by a voltage adjustment circuit. The erasing voltage is a local erasing voltage or a one-key full erasing voltage; the operations performed when the local erasing voltage and the one-key full erasing voltage are adjusted are different.

7. The method of claim 6, wherein the voltage is adjusted by a voltage adjustment circuit. When the local erasing voltage is adjusted, the first operation is that n contact points of a set size are simultaneously close to or contact the surface of the writing device; or n fingers are simultaneously close to or contact the surface of the writing device. When the one-key full erasing voltage is adjusted, the first operation is that m contact points of a set size are simultaneously close to or contact the surface of the writing device; or m fingers are simultaneously close to or contact the surface of the writing device; n≠m, and 2≤n≤5 and 2≤m≤5.

8. The method of claim 1, wherein the voltage is adjusted by a voltage adjustment circuit. The liquid crystal writing device detects the operation execution condition, specifically as follows: The liquid crystal writing device detects the operation type and the operation execution time in each adjustment region; based on the operation type and the adjustment region where the operation is performed, the increase or decrease of the erasing voltage is triggered.

9. A liquid crystal writing device erasing voltage adjustment system, characterized by, The method comprises the following steps: A detection unit is configured to detect the operation condition in each adjustment region and feed back the detection result to a master control unit; The master control unit is configured to determine whether the erasing voltage adjustment condition is met according to the received detection result, and if the condition is met, issue a voltage adjustment instruction to adjust the erasing voltage according to a preset logic; If the condition is not met, no action is triggered. A voltage generation circuit is configured to generate a corresponding voltage according to a voltage adjustment instruction of the master control unit. An indication unit is configured to indicate whether the current gesture voltage adjustment operation is successfully performed.

10. The liquid crystal writing device erasing voltage adjustment system of claim 9, wherein, The detection unit is a positioning device arranged on the liquid crystal writing device, and the positioning device is any one of infrared positioning, capacitive positioning, optical camera positioning, or laser radar positioning.

11. A method for adjusting the erasure voltage of a liquid crystal writing device, characterized in that, The method comprises: A plurality of local erasing test regions are demarcated at predetermined positions of the liquid crystal writing device, and a predetermined distance is arranged between two adjacent local erasing test regions. A writing operation is performed on each local erasing test region and the non-test region around the local erasing test region. In response to a trigger instruction for adjusting the erasing voltage, each local erasing test region is sequentially erased according to a preset erasing sequence until a local erasing test region with an erasing effect meeting a predetermined requirement is selected; and the erasing voltage corresponding to the selected local erasing test region is taken as the adjusted erasing voltage. The erasing voltage applied to each local erasing test region is different from each other within a preset range.

12. A method for adjusting the erasure voltage of a liquid crystal writing device, characterized in that, The method comprises: A plurality of local erasing test regions are demarcated at predetermined positions of the liquid crystal writing device, and a predetermined distance is arranged between two adjacent local erasing test regions. A writing operation is performed on each local erasing test region and the non-test region around the local erasing test region. In response to a trigger instruction for adjusting the erasing voltage, each local erasing test region is sequentially erased according to a preset erasing sequence until a local erasing test region with an erasing effect meeting a predetermined requirement is selected; and the erasing voltage corresponding to the selected local erasing test region is taken as the adjusted erasing voltage. The erasing voltage applied to each local erasing test region is different from each other within a preset range.

13. The method of adjusting the erasing voltage of a liquid crystal writing device according to claim 11 or 12, wherein A plurality of local erasing test regions are demarcated at predetermined positions of the liquid crystal writing device, and the specific steps are as follows: Within the local erasing voltage range of the liquid crystal writing device, a plurality of different erasing voltages are divided, each erasing voltage corresponds to a local erasing test region, and the corresponding erasing voltage is applied when the local erasing test region is erased.

14. The method of claim 13, wherein the voltage is adjusted by a voltage adjustment circuit. The local erasing test regions are sequentially arranged along the horizontal or vertical direction of the liquid crystal writing device, and a predetermined distance is arranged between two adjacent local erasing test regions.

15. The method of claim 11 or 12, wherein the voltage is adjusted by a voltage adjustment unit. The trigger instruction for adjusting the erasing voltage is triggered by a button on the liquid crystal writing device, or by performing a predetermined gesture or action at a predetermined position of the liquid crystal writing device, or by the controller.

16. The method of claim 11 or 12, wherein the voltage is adjusted by a range of 0.1 to 1.0 V. The way of selecting the local erasing test region with an erasing effect meeting a predetermined requirement is that a predetermined gesture or action is performed on the local erasing test region with an erasing effect meeting a predetermined requirement.

17. A liquid crystal writing device erasing voltage adjustment system, characterized by, The method comprises: A master control unit is configured to sequentially control erasing of each local erasing test region according to a preset erasing sequence after receiving a trigger instruction for adjusting the erasing voltage; judge the erasing effect of each local erasing test region, and select the erasing voltage corresponding to the local erasing test region with an erasing effect meeting a predetermined requirement as the adjusted erasing voltage. The method comprises the following steps: demarcating a plurality of local erasing test areas at predetermined positions of the liquid crystal writing device, and setting a distance between two adjacent local erasing test areas; and applying different erasing voltages to each local erasing test area within a preset range.

18. A liquid crystal writing device erasing voltage adjustment system, characterized by, The method comprises the following steps: The main control unit is configured to control the erasing of each local erasing test area in a preset erasing sequence after receiving a trigger instruction for adjusting the erasing voltage, until a local erasing test area with a selected erasing effect meeting a predetermined requirement is obtained; and the erasing voltage corresponding to the local erasing test area is taken as the adjusted erasing voltage. The method comprises the following steps: demarcating a plurality of local erasing test areas at predetermined positions of the liquid crystal writing device, and setting a distance between two adjacent local erasing test areas; and increasing the erasing voltage applied to each local erasing test area within a preset range in sequence when erasing each local erasing test area according to the erasing sequence.

Images