CN113741080B - Optical writing pen for liquid crystal writing device and writing display method - Google Patents

Optical writing pen for liquid crystal writing device and writing display method Download PDF

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Publication number
CN113741080B
CN113741080B CN202110992418.5A CN202110992418A CN113741080B CN 113741080 B CN113741080 B CN 113741080B CN 202110992418 A CN202110992418 A CN 202110992418A CN 113741080 B CN113741080 B CN 113741080B
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tft
illumination
liquid crystal
voltage
writing
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CN113741080A (en
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李清波
杨猛训
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Shandong Lanbeisite Educational Equipment Group
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Shandong Lanbeisite Educational Equipment Group
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/13338—Input devices, e.g. touch panels
    • 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
    • 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
    • G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/0354—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor with detection of 2D relative movements between the device, or an operating part thereof, and a plane or surface, e.g. 2D mice, trackballs, pens or pucks
    • G06F3/03545—Pens or stylus
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

The invention provides an optical writing pen for a liquid crystal writing device and a writing display method, wherein the optical writing pen comprises a light-emitting element with adjustable illumination intensity, and the light emitted by the light-emitting element with different illumination intensities causes the change of TFT current or TFT voltage in an illumination area of the liquid crystal display device; changing the color of the illumination movement track or executing electrically driven erasure of a set area near the illumination movement track by detecting the value of the TFT current or the TFT voltage; the invention realizes the remote writing and positioning of the liquid crystal writing device, and simultaneously controls and displays the illumination moving tracks with different colors according to the changes of different TFT currents or TFT voltages, thereby improving the experience satisfaction degree of users on products.

Description

Optical writing pen for liquid crystal writing device and writing display method
Technical Field
The invention relates to the technical field of liquid crystal writing boards, in particular to an optical writing pen for a liquid crystal writing device and a writing display method.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
Bistable liquid crystal writing display devices (such as writing tablets or electronic papers) operate on the principle of using the bistable character of liquid crystals to perform writing, display and/or erasing; a general liquid crystal display (LCD or LED or OLED, etc.) whose display relies on a backlight or a self-luminous device provided internally and must be in an energized state to be able to perform a writing/display function, and cannot write/display when power is turned off.
At present, bistable liquid crystal writing display devices and common liquid crystal display screens cannot realize remote light writing and illumination track positioning during remote light writing, and meanwhile, the existing scheme cannot realize color control of illumination moving tracks during remote light writing.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides the optical writing pen and the writing display method for the liquid crystal writing device, realizes non-contact writing and positioning of the liquid crystal writing device, controls and displays illumination moving tracks with different colors according to different illumination intensities, and improves the experience satisfaction degree of users on products.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
in order to achieve the above object, according to a first aspect of the present invention, there is provided an optical writing pen for a liquid crystal writing apparatus, characterized in that,
the light-emitting device comprises a light-emitting element with adjustable illumination intensity, and the light emitted by the light-emitting element with different illumination intensities induces the change of TFT current or TFT voltage in an illumination area of the liquid crystal display device.
According to a second aspect of the present invention, there is provided a writing display method, based on the above optical writing pen, comprising:
changing the color of the illumination movement locus or performing electrically driven erasure of a set area in the vicinity of the illumination movement locus by detecting the value of the TFT current or TFT voltage.
Further, the intensity of light emitted from the light emitting element is classified so that TFT currents or TFT voltages corresponding to different levels can be distinguished.
Further, the corresponding TFT current values of adjacent levels differ by at least 20%.
According to a third aspect of the present invention, there is provided a liquid crystal writing apparatus comprising a main control unit and a conductive layer, a liquid crystal layer and a base layer which are sequentially arranged, wherein the base layer is integrated with a TFT array for positioning which is arranged according to a set rule;
each of the TFTs in the first direction is connected by at least one first wire and supplied with a control voltage;
each of the TFTs in the second direction is connected by at least one second wire and supplies an input voltage;
the output end of each TFT in the first direction is connected by at least one third wire;
controlling the TFT to be in a critical state, and detecting a TFT current value or a TFT voltage value by using the second wire and the third wire;
the main control unit can change the color of the illumination moving track or execute electrically-driven erasure of a set area near the illumination moving track by using the writing display method.
According to a fourth aspect of the present invention, there is provided a liquid crystal writing system comprising the optical writing pen described above and the liquid crystal writing apparatus described above.
According to a fifth aspect of the present invention, there is provided an electronic paper, including a main control unit, and a conductive layer, a polar liquid crystal material layer, and a base layer sequentially disposed, wherein the base layer is integrated with a TFT array for positioning, which is arranged according to a set rule;
each of the TFTs in the first direction is connected by at least one first wire and supplied with a control voltage;
each of the TFTs in the second direction is connected by at least one second wire and supplies an input voltage;
the output end of each TFT in the first direction is connected by at least one third wire;
controlling the TFT to be in a critical state, and detecting a TFT current value or a TFT voltage value by using the second wire and the third wire;
the main control unit can change the color of the illumination moving track or execute electrically-driven erasure of a set area near the illumination moving track by using the writing display method.
According to a sixth aspect of the present invention, there is provided a liquid crystal writing system comprising the optical writing pen described above and the electronic paper described above.
According to a seventh aspect of the present invention, there is provided a liquid crystal writing system, a bistable liquid crystal writing device and an external display device, wherein the bistable liquid crystal writing device comprises a conductive layer, a bistable liquid crystal layer and a substrate layer which are sequentially arranged, a plurality of pixel units are arrayed on the substrate layer, and each pixel unit is internally provided with a pixel electrode and a thin film field effect transistor TFT connected with the pixel electrode;
the TFTs corresponding to each row of pixel units are connected by at least one first wire and are supplied with control voltage;
the TFTs corresponding to each column of pixel units are connected by at least one second wire and are supplied with input voltage;
a resistor is connected in series between the second lead and the first power supply, one end of the resistor connected with the second lead is connected with the first input end of a comparator or an amplifier, the second input end of the comparator or the amplifier inputs a set voltage threshold, and the output of the comparator is used for detecting a TFT current value or a TFT voltage value;
the main control unit is communicated with a controller of the external display device, and the controller can change the color of the illumination moving track or execute electric driving erasure of a set area near the illumination moving track by utilizing the writing display method according to the TFT current value or the TFT voltage value caused by the optical writing pen sent by the main control unit.
According to an eighth aspect of the present invention, there is provided a liquid crystal writing system, a bistable liquid crystal writing device and an external display device, wherein the bistable liquid crystal writing device comprises a conductive layer, a bistable liquid crystal layer and a substrate layer which are sequentially arranged, a plurality of pixel units are arrayed on the substrate layer, and each pixel unit is internally provided with a pixel electrode and a thin film field effect transistor TFT connected with the pixel electrode;
the TFTs corresponding to each row of pixel units are connected by at least one first wire and are supplied with control voltage;
the TFTs corresponding to each column of pixel units are connected by at least one second wire and are supplied with input voltage;
the resistor is connected in series between the second lead and the first power supply, one end of the resistor, which is connected with the second lead, is connected with the analog switch, the analog switch is connected with the first input end of the comparator or the amplifier, the second input end of the comparator or the amplifier inputs a set voltage threshold, and the output of the comparator is used for detecting the TFT current value or the TFT voltage value;
the main control unit is communicated with a controller of the external display device, and the controller changes the color of the illumination moving track or executes electric driving erasure of a set area near the illumination moving track by utilizing the writing display method according to the TFT current value or the TFT voltage value caused by the optical writing pen sent by the main control unit.
Compared with the prior art, the invention has the beneficial effects that:
the light writing pen comprises the light-emitting element with adjustable illumination intensity, the light emitted by the light-emitting element and with different illumination intensities causes the change of TFT current or TFT voltage in the illumination area of the liquid crystal display device, the color of the illumination movement track is changed or the electrically driven erasure of the set area near the illumination movement track is executed by detecting the value of the induced current, and the remote writing and positioning of the liquid crystal writing device are realized, and meanwhile, the color control of the illumination movement track or the erasure of the set area near the illumination movement track is realized.
According to the invention, the detected change of the TFT current or the TFT voltage in the illumination area is transmitted to the external display device in real time, so that the external display device can perform synchronous illumination movement track display and color control according to the obtained change of the TFT current or the TFT voltage, and the experience satisfaction degree of a user on a product is greatly improved.
Additional aspects of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention.
Fig. 1 is a schematic diagram of an optical writing pen according to embodiment 1 of the present invention.
Fig. 2 is a schematic diagram of an optical writing pen circuit module according to embodiment 1 of the present invention.
Fig. 3 is a schematic structural diagram of a TFT substrate according to embodiment 2 of the present invention.
1-an optical writing pen body; 2-light emitting element, 3-function switch, 4-light emitting switch.
Detailed Description
The invention will be further described with reference to the drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present invention. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
Embodiments of the invention and features of the embodiments may be combined with each other without conflict.
Example 1:
the embodiment 1 of the invention provides an optical writing pen for a liquid crystal writing device, which comprises a light-emitting element with adjustable illumination intensity, wherein the light emitted by the light-emitting element with different illumination intensities induces the change of TFT current or TFT voltage in an illumination area of the liquid crystal display device.
In this embodiment, it is preferable to perform color control or erasure control of the illumination movement track by using a TFT current change, where each illumination sensing current value range (i.e., the light emitting intensity value range corresponds to the color of one handwriting) corresponds to the color of one illumination movement track.
In this embodiment, a light emitting element is preferably selected, each light emitting intensity corresponds to a value or a range of illumination induced current, the value range of TFT illumination induced current corresponds to a certain color, and other ranges display other colors; or the numerical ranges of the respective TFT currents are grouped, each group corresponding to a different color.
Preferably, a plurality of gears can be arranged on the optical writing pen, each gear corresponds to a luminous intensity range, and each gear is configured with an illumination moving track color. For example, the light writing pen is provided with 1 grade, 2 grade, 3 grade, 4 grade and 5 grade, the luminous intensity of 1 grade is lowest, the luminous intensity of 2 grade is higher than 1 grade, the luminous intensity of 3 grade is higher than 2 grade, the luminous intensity of 4 grade is higher than 3 grade, the luminous intensity of 5 grade is highest, the luminous intensity of 5 grade is yellow, and a person skilled in the art can set the number of gear steps and the corresponding luminous intensity or luminous intensity range of each gear step according to specific working conditions, and the setting is not repeated here.
In this embodiment, as shown in fig. 1, the optical writing pen includes an optical writing pen 1, and a light emitting element 2, a function switch 3, and a light emitting switch 4 provided at an end portion of the optical writing pen, where gear adjustment is performed by the function switch 3, and light emitting element on-off control is performed by the light emitting switch 4; it will be appreciated that in other embodiments, the same end of the optical writing pen body 1 may be provided with a nib for pressure writing, and the optical writing pen may be other structures of elements or devices capable of emitting light with adjustable intensity.
As shown in fig. 2, the optical writing pen comprises a power supply module, a light emitting element and a main control unit, wherein the main control unit is connected with the light emitting element through a light intensity adjusting circuit and is used for adjusting the light intensity of the light emitting element.
As a preferred manner, the light intensity adjusting circuit includes a voltage adjusting module or a current adjusting module; the input ends of the voltage regulating module or the current regulating module are connected with the power supply module, and the output ends are connected with the luminous elements in the wiper.
The power module may be a battery or other power devices, and those skilled in the art may specifically select the power module according to the actual situation.
The main control chip is an existing chip, and a person skilled in the art can select the model of the corresponding chip according to the actual precision requirement.
In one or more embodiments, the voltage regulating module includes a main control chip, a voltage regulating chip and a switching element, the voltage regulating chip is connected with the light emitting element, the voltage regulating chip is used for regulating the output voltage of the power module to a set high voltage which can be born by the light emitting element, the switching element is connected in series between the voltage regulating chip and the light emitting element, and the main control chip is used for controlling the on time of the switching element so as to realize the regulation of the illuminance of the light emitting element.
The main control chip and the voltage regulating chip are all existing chips, and a person skilled in the art can select the model of the corresponding chip according to actual precision requirements.
In another embodiment, the voltage regulation module includes a main control chip and a programmable transformation circuit, the main control chip is in communication with the programmable transformation circuit, the programmable transformation circuit is used for directly outputting a voltage value applied to the light-emitting element, and the main control chip is used for controlling the on time of the switch element so as to realize the adjustment of the illuminance of the light-emitting element.
The main control chip is an existing chip, and a person skilled in the art can select the model of the corresponding chip according to actual precision requirements.
The programmable voltage transformation circuit is also an existing circuit structure, and a person skilled in the art can select the setting according to the actual precision requirement.
As another implementation mode, the voltage regulating module includes a main control chip and a voltage regulating circuit, where the voltage regulating circuit is a boost circuit or a buck circuit and is used for regulating the output voltage of the power module to a set high voltage, and the main control chip is used for conducting time of a switching element in the voltage regulating circuit so as to realize adjustment of illuminance of the light emitting element.
The main control chip is an existing chip, and a person skilled in the art can select the model of the corresponding chip according to actual precision requirements.
As another embodiment, the voltage adjusting module includes a voltage boosting circuit, a voltage dividing circuit, a multiplexer and a current amplifier, wherein the voltage boosting circuit is used for boosting the output voltage of the power module to a set high voltage that can be borne by the light emitting element, the voltage dividing circuit is used for dividing the set high voltage to generate a group of voltages, the multiplexer is used for selecting one voltage in the group of voltages, and the current amplifier is used for amplifying the current output by the multiplexer and adding the current to the light emitting element so as to realize adjustment of the illuminance of the light emitting element.
Example 2:
embodiment 2 of the present invention provides a writing display method, based on the optical writing pen described in embodiment 1, of changing the color of the illumination movement locus by detecting the value of the TFT current or TFT voltage or performing electrically driven erasing of a set area in the vicinity of the illumination movement locus.
Specifically, the liquid crystal writing device in this embodiment is a bistable liquid crystal writing device, the control unit of the bistable liquid crystal writing device is in control communication with the external display device, positioning, displaying and erasing of the illumination moving track are performed on the bistable liquid crystal writing device, displaying and color controlling of the illumination moving track are performed on the external display device, and the following scheme is adopted for detecting the TFT current or the TFT voltage:
the liquid crystal writing device comprises a TFT substrate, a plurality of pixel units are arrayed on the TFT substrate, and each pixel unit is internally provided with a pixel electrode and a thin film field effect transistor (TFT) connected with the pixel electrode;
the TFTs corresponding to each row of pixel units are connected by at least one first wire and are supplied with control voltage;
the TFTs corresponding to each column of pixel units are connected by at least one second wire and are supplied with input voltage;
specifically, TFTs corresponding to different rows of pixel units are connected to different first wires; for the TFT corresponding to one row of pixel units, one or more first wires may be connected; when a first wire is connected, all TFT gates in the row are connected together; when a plurality of first conductors are connected, the TFTs of the row are grouped, one first conductor being connected to each group.
The connection mode of the second conducting wire and the TFT corresponding to each column of pixel units is the same, namely:
the TFTs corresponding to the pixel units in different columns are connected with different second leads; one or more second wires can be connected to the TFTs corresponding to one column of pixel units; when a second wire is connected, all TFT sources in the column are connected together; when a plurality of second conductors are connected, the TFTs of the column are grouped, one for each group.
The TFT is controlled to be in a critical state, and a light irradiation region, which may include a light irradiation position, size and shape, is determined by detecting whether a TFT current or a TFT voltage is changed.
In this embodiment, the critical state is specifically: applying a set control voltage and an input voltage to a gate and a source of the TFT, respectively; when receiving illumination within a set illumination intensity range, the TFT is turned on; and when the TFT is not irradiated by the illumination within the set illumination intensity range, the TFT is in an off state.
If the set control voltage and the set input voltage are respectively applied to the grid electrode and the source electrode of the TFT, and the TFT is in a cut-off state, the TFT is not conducted even if the TFT receives illumination within the set illumination intensity range; even though ambient light may cause a change in current between the TFT source and drain, such a change is negligible compared to the current when the critical state of the TFT is turned on by illumination of a set intensity range.
In this embodiment, the TFT control voltage is a voltage input through the TFT gate, and is used to control the on and off of the TFT; the TFT input voltage is a voltage input through the TFT source, and is a voltage applied to the corresponding pixel electrode after the TFT is turned on.
The voltage loaded on the grid electrode and the source electrode of the TFT is controlled to be in a critical state, when the TFT receives illumination within a set intensity range, the current from the source electrode to the drain electrode of the TFT within the illumination range can be increased, and the illumination range can be determined by detecting the current change.
Further, the current change flowing through the resistor can be converted into voltage change at two ends of the resistor through an external resistor, so that the circuit detection is facilitated.
Of course, the rows and columns described above are interchangeable; namely: at least one first wire for supplying a TFT control voltage corresponding to each column of pixel cells, and at least one second wire for supplying a TFT input voltage corresponding to each row of pixel cells; the corresponding illumination positioning process also makes corresponding adjustments, which will be readily apparent to those skilled in the art.
In determining the position of the area irradiated with light specifically, this embodiment may be implemented in several ways as follows:
(1) Determining the column position of the light
Controlling all TFTs to be in a critical state at the same time, and determining the position of a column where illumination is located by detecting whether the TFT current or the TFT voltage changes; that is, it is determined in which column or columns of all pixel units the TFT whose current or voltage is changed is located.
Alternatively, the TFTs are controlled in a critical state column by column, and the position of the column where the light is located is determined by detecting whether the TFT current or the TFT voltage changes.
Alternatively, the selected column controls the TFT to be in a critical state, and the position of the column where the light is located is determined by detecting whether the TFT current or the TFT voltage changes.
(2) Determining the row position of the illumination
Controlling TFTs in a critical state row by row, and determining the position of the row where illumination is located by detecting whether the TFT current or the TFT voltage changes; that is, it is determined which row or rows of all pixel cells the TFT whose current or voltage is changed is in.
Alternatively, the TFTs are controlled to be in a critical state according to the selected row, and the position of the row where the light is located is determined by detecting whether the TFT current or the TFT voltage changes. Such as: controlling TFTs corresponding to two rows of pixel units to be in a critical state each time, and if TFTs with current or voltage changed exist in the two rows, controlling the TFTs to be in the critical state row by row for the two rows, and specifically judging which row the TFTs with current or voltage changed are located; if there are no TFTs in the two rows whose current or voltage changes, no further row-by-row detection is performed.
Or dividing the whole area into two parts according to the row, respectively controlling each part to be in a critical state, and dividing the part with the detected TFT current or TFT voltage change into two parts according to the row again; repeating the above process until the position of the row where the illumination is located can be determined; for a portion where no change in TFT current or TFT voltage is detected, detection may not be performed.
Alternatively, the two parts may be equally distributed, or may be distributed according to any set ratio, for example: 1:1,1:2,1:3, etc., as may be desired by one skilled in the art.
Alternatively, the TFTs may be controlled to be in a critical state one by one, and the position of the column and the position of the row where the light is located may be directly determined by detecting whether the TFT current or the TFT voltage changes.
As a specific embodiment, a specific method of determining the illumination area may employ a combination of the above-described methods of determining the column position and determining the row position.
Example 3:
embodiment 3 of the present invention provides a writing display method, based on the optical writing pen provided in embodiment 1, of changing the color of the illumination movement locus by detecting the value of the TFT current or the TFT voltage or performing electrically driven erasing of a set area in the vicinity of the illumination movement locus.
In this embodiment, the liquid crystal writing device is a common liquid crystal writing device based on non-bistable liquid crystal, and at this time, the positioning, display, erasing or color control of the illumination movement track can be directly performed on the liquid crystal writing device; or the control unit of the liquid crystal writing device is in control communication with the external display device, and the display and the color control of the illumination moving track are performed on the external display device.
The detection of TFT current or TFT voltage adopts the following scheme:
the TFT substrate is integrated with a TFT array which is arranged according to a set rule and used for positioning;
each of the TFTs in the first direction is connected by at least one first wire and supplied with a control voltage;
each of the TFTs in the second direction is connected by at least one second wire and supplies an input voltage;
the output terminals of the TFTs in each first direction are connected by at least one third wire.
Wherein the TFT gates in different first directions are connected with different first wires; for one of the TFTs in the first direction, the gate electrode thereof may be connected to one or more first conductive lines; when a first wire is connected, all TFT gates in the first direction are connected together; when a plurality of first wires are connected, TFTs in the first direction are grouped, and each group is connected to one first wire.
Similarly, the TFT sources in the second direction are connected with different second wires; for one of the TFTs in the second direction, the source thereof may be connected to one or more second wires; when a second wire is connected, all TFT sources in the second direction are connected together; when a plurality of second wires are connected, TFTs in the second direction are grouped, and each group is connected to one second wire.
The TFT output terminals (i.e., drains) in different first directions are connected to different third conductors; one or more third wires may be connected to one of the TFT output terminals in the first direction; when a third wire is connected, all TFT drains in the first direction are connected together; when a plurality of second wires are connected, TFTs in the first direction are grouped, and each group is connected to one second wire.
In this embodiment, each first direction and each second direction can be understood as each row and each column; except that the rows and columns may be arranged vertically in both horizontal and vertical directions as is commonly understood.
It may also be arranged vertically in other setting directions, such as: the rows and columns are rotated by any angle based on the vertical arrangement of the rows and columns in the horizontal and vertical directions, while the rows and columns remain vertical, but not in the horizontal and vertical directions.
Of course, the rows and columns may be arranged to intersect at a set angle.
It will be appreciated that the rows and columns described above may also be interchanged, i.e. each first direction may be understood as each column and each second direction may be understood as each row.
In a specific application, the TFTs in each first direction or each second direction may be aligned in a straight line, a curved line, a broken line, or a combination of at least two of the foregoing arrangements.
As a preferred embodiment, the first direction is a horizontal direction and the second direction is a vertical direction; alternatively, the first direction is a vertical direction and the second direction is a horizontal direction.
In the following embodiments, the description of the technical solutions is given by taking a row with a first direction as a horizontal direction and a column with a second direction as a vertical direction as an example; other TFT matrix arrangements are equally implemented.
The TFT is controlled to be in a critical state, and whether the TFT is irradiated by illumination in a set intensity range is determined by detecting whether the input current or the input voltage of the TFT and the output current or the output voltage are changed, so that the area irradiated by the illumination is determined. The area where light is irradiated may include a position, a size, and a shape where light is irradiated.
In this embodiment, the critical state is specifically: applying a set control voltage and an input voltage to a gate and a source of the TFT, respectively; when receiving illumination within a set illumination intensity range, the TFT is turned on; and when the TFT is not irradiated by the illumination within the set illumination intensity range, the TFT is in an off state.
If the set control voltage and the set input voltage are respectively applied to the grid electrode and the source electrode of the TFT, and the TFT is in a cut-off state, the TFT is not conducted even if the TFT receives illumination within the set illumination intensity range; even though ambient light may cause a change in current between the TFT source and drain, such a change is negligible compared to the current when the TFT is turned on by light of a set intensity range in the critical state.
In this embodiment, the TFT control voltage is a voltage input through the TFT gate, and is used to control the on and off of the TFT; the TFT input voltage is the voltage input through the TFT source, and the TFT output terminal is the TFT drain.
The voltage loaded on the TFT grid electrode and the source electrode is controlled to be in a critical state, when the TFT receives illumination within a set intensity range, the current from the TFT source electrode to the drain electrode within the illumination range can be increased, namely, the current flowing through the TFT grid electrode and the drain electrode can be changed, and the illumination range can be determined by detecting the current change.
Further, the current change flowing through the resistor can be converted into voltage change at two ends of the resistor through an external resistor, so that the circuit detection is facilitated.
In this embodiment, the control TFT is in a critical state, and the light irradiation area is determined by detecting whether the TFT current or TFT voltage changes.
The method of the present embodiment will be described below by taking a row in which the first direction is the horizontal direction and a column in which the second direction is the vertical direction as an example.
In determining the position of the area irradiated with light specifically, this embodiment may be implemented in several ways as follows:
(1) Determining the position of the line where the illumination is located:
controlling all TFTs to be in a critical state at the same time; determining the position of the line where the illumination is located by detecting whether the TFT output current or the output voltage changes; i.e. which row or rows of all rows the TFTs whose current or voltage changes are located.
Or, each time, the TFTs on one row are independently controlled to be in a critical state, and the other rows are independently controlled to be in an off state, and whether the row receives illumination irradiation can be determined by detecting whether the output current or the output voltage of the TFTs changes; all rows are traversed and the location of the row where the illumination is located is determined.
Or, each time the TFT of the selected set row number is in a critical state, and the other rows are in a cut-off state, whether the row receives illumination can be determined by detecting whether the TFT output current or output voltage changes; all rows are traversed and the location of the row where the illumination is located is determined.
(2) Determining the position of the column where the illumination is located:
controlling all TFTs to be in a critical state at the same time; determining the position of a column where illumination is located by detecting whether the TFT input current or input voltage changes; that is, it is determined in which column or columns among all columns the TFT whose current or voltage is changed is located.
Or, each time a TFT on one column is controlled to be in a critical state and the other columns are controlled to be in an off state, whether the column receives illumination can be determined by detecting whether the TFT input current or input voltage changes; traversing all columns and determining the position of the column where the illumination is located.
Or, each time a TFT of a set column number is selected to be in a critical state, and the other columns are in an off state, whether the column receives illumination can be determined by detecting whether the input current or the input voltage of the TFT changes; traversing all columns and determining the position of the column where the illumination is located.
As a specific embodiment, a specific method of determining the illumination area may employ a combination of the above-described methods of determining the column position and determining the row position.
Example 4:
embodiment 4 of the present invention provides a liquid crystal writing apparatus, which is characterized by comprising a control unit that performs display of an illumination movement locus or performs electrically driven erasing of a set area in the vicinity of the illumination movement locus by using the writing display method described in embodiment 2 or embodiment 3.
Example 5:
embodiment 5 of the present invention provides a liquid crystal writing system, which includes the optical writing pen of embodiment 1 and the liquid crystal writing device of embodiment 4.
Example 6:
an embodiment 6 of the present invention provides an electronic paper, including a control unit that performs display of an illumination movement track or performs electrically driven erasure of a set area around the illumination movement track by using the writing display method described in embodiment 2 or embodiment 3.
Example 7:
embodiment 7 of the present invention provides a liquid crystal writing system, which includes the optical writing pen of embodiment 1 and the electronic paper of claim 7.
Example 8:
the embodiment 8 of the invention provides a display control system of a liquid crystal writing device, which comprises an external display device and the liquid crystal writing device in the embodiment 4, wherein a control unit of the liquid crystal writing device is communicated with a controller of the external display device;
the controller changes the color of the illumination moving track of the external display device or executes the electrically driven erasure of the setting area near the illumination moving track according to the TFT current or TFT voltage induced by the received optical writing pen.
Example 9:
the embodiment 9 of the invention provides a display control system of a liquid crystal writing device, which comprises an external display device and the electronic paper described in the embodiment 7, wherein a control unit of the electronic paper is communicated with a controller of the external display device;
the controller changes the color of the illumination moving track of the external display device or executes the electrically driven erasure of the setting area near the illumination moving track according to the TFT current or TFT voltage induced by the received optical writing pen.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. An optical writing pen for a liquid crystal writing device, characterized in that,
the light-emitting device comprises a light-emitting element with adjustable illumination intensity, wherein the light emitted by the light-emitting element and having different illumination intensities causes the change of TFT current or TFT voltage in an illumination area of the liquid crystal display device; to change the color of the illumination movement locus or to perform electrically driven erasure of a set area in the vicinity of the illumination movement locus by detecting the value of the TFT current or TFT voltage.
2. A writing display method is characterized in that based on an optical writing pen, the optical writing pen comprises a light-emitting element with adjustable illumination intensity, and the light emitted by the light-emitting element with different illumination intensities causes the change of TFT current or TFT voltage in an illumination area of a liquid crystal display device;
the writing display method comprises the following steps:
the color of the illumination movement locus is changed or electrically driven erasure of a set area in the vicinity of the illumination movement locus is performed by detecting the value of the TFT current or TFT voltage.
3. The writing display method of claim 2, wherein,
the intensity of light emitted from the light emitting element is classified so that TFT currents or TFT voltages corresponding to different levels can be distinguished.
4. A writing display method according to claim 3, wherein,
the corresponding TFT current values of adjacent levels differ by at least 20%.
5. The liquid crystal writing device is characterized by comprising a main control unit, a conducting layer, a liquid crystal layer and a basal layer which are sequentially arranged, wherein the basal layer is integrated with a TFT array which is arranged according to a set rule and used for positioning;
each of the TFTs in the first direction is connected by at least one first wire and supplied with a control voltage;
each of the TFTs in the second direction is connected by at least one second wire and supplies an input voltage;
the output end of each TFT in the first direction is connected by at least one third wire;
controlling the TFT to be in a critical state, and detecting a TFT current value or a TFT voltage value by using the second wire and the third wire;
the main control unit is capable of changing the color of the illumination movement locus or performing electrically driven erasure of a set area in the vicinity of the illumination movement locus by using the writing display method according to any one of claims 2 to 4.
6. A liquid crystal writing system comprising the optical writing pen of claim 1 and the liquid crystal writing apparatus of claim 5.
7. The electronic paper is characterized by comprising a main control unit, a conducting layer, a polar liquid crystal material layer and a basal layer which are sequentially arranged, wherein the basal layer is integrated with a TFT array which is arranged according to a set rule and used for positioning;
each of the TFTs in the first direction is connected by at least one first wire and supplied with a control voltage;
each of the TFTs in the second direction is connected by at least one second wire and supplies an input voltage;
the output end of each TFT in the first direction is connected by at least one third wire;
controlling the TFT to be in a critical state, and detecting a TFT current value or a TFT voltage value by using the second wire and the third wire;
the main control unit is capable of changing the color of the illumination movement locus or performing electrically driven erasure of a set area in the vicinity of the illumination movement locus by using the writing display method according to any one of claims 2 to 4.
8. A liquid crystal writing system comprising the optical writing pen of claim 1 and the electronic paper of claim 7.
9. The bistable liquid crystal writing system is characterized by comprising a bistable liquid crystal writing device and an external display device, wherein the bistable liquid crystal writing device comprises a conducting layer, a bistable liquid crystal layer and a basal layer which are sequentially arranged, a plurality of pixel units are arrayed on the basal layer, and each pixel unit is internally provided with a pixel electrode and a thin film field effect transistor (TFT) connected with the pixel electrode;
the TFTs corresponding to each row of pixel units are connected by at least one first wire and are supplied with control voltage;
the TFTs corresponding to each column of pixel units are connected by at least one second wire and are supplied with input voltage;
a resistor is connected in series between the second lead and the first power supply, one end of the resistor connected with the second lead is connected with the first input end of a comparator or an amplifier, the second input end of the comparator or the amplifier inputs a set voltage threshold, and the output of the comparator is used for detecting a TFT current value or a TFT voltage value;
the main control unit is in communication with a controller of the external display device, and the controller can change the color of the illumination moving track or execute electrically-driven erasure of a set area near the illumination moving track by using the writing display method according to any one of claims 2 to 4 according to the TFT current value or the TFT voltage value caused by the optical writing pen sent by the main control unit.
10. The bistable liquid crystal writing system is characterized by comprising a bistable liquid crystal writing device and an external display device, wherein the bistable liquid crystal writing device comprises a conducting layer, a bistable liquid crystal layer and a basal layer which are sequentially arranged, a plurality of pixel units are arrayed on the basal layer, and each pixel unit is internally provided with a pixel electrode and a thin film field effect transistor (TFT) connected with the pixel electrode;
the TFTs corresponding to each row of pixel units are connected by at least one first wire and are supplied with control voltage;
the TFTs corresponding to each column of pixel units are connected by at least one second wire and are supplied with input voltage;
the resistor is connected in series between the second lead and the first power supply, one end of the resistor, which is connected with the second lead, is connected with the analog switch, the analog switch is connected with the first input end of the comparator or the amplifier, the second input end of the comparator or the amplifier inputs a set voltage threshold, and the output of the comparator is used for detecting the TFT current value or the TFT voltage value;
the main control unit is communicated with a controller of the external display device, and the controller changes the color of the illumination moving track or executes electric driving erasure of a set area near the illumination moving track by using the writing display method according to any one of claims 2-4 according to the TFT current value or the TFT voltage value caused by the optical writing pen sent by the main control unit.
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CN114822436B (en) * 2022-04-13 2023-12-08 山东蓝贝思特教装集团股份有限公司 Liquid crystal writing device with photoelectric detection function and method
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