CN113437096B - TFT-based rapid optical positioning method and device - Google Patents

TFT-based rapid optical positioning method and device Download PDF

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CN113437096B
CN113437096B CN202110988745.3A CN202110988745A CN113437096B CN 113437096 B CN113437096 B CN 113437096B CN 202110988745 A CN202110988745 A CN 202110988745A CN 113437096 B CN113437096 B CN 113437096B
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tft
comparator
amplifier
voltage
wire
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CN113437096A (en
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李清波
杨猛训
李泉堂
宫向东
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Shandong Lanbeisite Educational Equipment Group
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers
    • H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body
    • H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
    • H01L27/124—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having potential barriers; including integrated passive circuit elements having potential barriers the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs with a particular composition, shape or layout of the wiring layers specially adapted to the circuit arrangement, e.g. scanning lines in LCD pixel circuits
    • 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
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells

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Abstract

The invention discloses a TFT-based rapid optical positioning method and a TFT-based rapid optical positioning device, which comprise the following steps: the TFT substrate is integrated with a TFT array which is arranged according to a set rule and used for positioning; each of the first directional TFTs is connected by at least one first wire and supplies a control voltage; each of the second directional TFTs 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. And controlling the TFT to be in a critical state, and determining whether the TFT is irradiated by light in a set intensity range by detecting whether the current or the voltage of the TFT changes, thereby determining the light-irradiated area. According to the invention, by utilizing the characteristic of TFT light sensitivity, the TFT is in a critical state, and when the TFT is irradiated by light with set light intensity, the TFT can be switched on, the current from the source electrode to the drain electrode of the TFT can be changed, so that the row position and the column position of the TFT can be determined, and the positioning by utilizing light can be realized.

Description

TFT-based rapid optical positioning method and device
Technical Field
The invention relates to the technical field of liquid crystal writing or liquid crystal display positioning, in particular to a TFT-based rapid optical positioning method and device.
Background
The liquid crystal writing or display devices currently on the market mainly comprise:
(1) bistable liquid crystal writing display devices, such as writing tablets or electronic papers, operate on the principle of writing, displaying and/or erasing by virtue of the bistable nature of the liquid crystal. For example, cholesteric liquid crystal is used as a writing board, the writing pressure track of a writing pen is recorded by changing the liquid crystal state at a pen point through the pressure acting on the liquid crystal writing board, and then corresponding writing contents are displayed; the cholesteric liquid crystal structure is changed by applying an electric field, so that the writing pressure track on the liquid crystal writing board disappears to realize erasing.
(2) A common liquid crystal display (LCD, LED, OLED, or the like) that relies on a backlight or a self-light emitting device internally disposed for display and must be powered on to implement a writing/displaying function, and that cannot be written/displayed when power is off;
when the device is used for positioning handwriting, the positioning is mostly realized by adopting the modes of infrared positioning, optical or ultrasonic/distance sensor positioning, capacitive screen positioning or electromagnetic positioning and the like; however, these positioning methods require external components such as: when infrared positioning is utilized, one or more groups of infrared transmitting/receiving arrays are required to be added at the edge of the liquid crystal writing device; when the ultrasonic/distance sensor is used for positioning, at least two pairs of ultrasonic transceiving sensors are required to be added on the liquid crystal writing device. Therefore, the investment cost is increased, the size and the thickness of the liquid crystal writing device are increased, and the experience satisfaction degree of a user on a product is influenced.
The TFT semiconductor channel forms photon-generated carriers under the condition of illumination, namely electron-hole pairs, electrons move towards a high potential direction, and holes move towards a low potential direction, so that hole leakage current is formed, and the influence of the photon-generated carriers on the leakage current of the TFT device is obvious. When light is irradiated, the conductivity of the active layer changes due to the generation of photo-generated carriers, i.e., a photoconductive phenomenon occurs, the on/off current of the TFT is increased compared with that in the absence of light, and the threshold voltage also changes accordingly.
In the prior art, for the illumination-sensitive characteristic of the TFT, measures are often needed to overcome the effect, such as: when the TFT process is applied to the field of liquid crystal display, the TFT is directly exposed to the irradiation of a backlight source, and the threshold voltage and the on/off current ratio of the TFT are changed due to the influence of a photoconductive effect, so that the display effect is influenced; therefore, the switching element TFT is usually shielded from light in the liquid crystal display to avoid the influence of light on the display effect.
Disclosure of Invention
Based on the TFT technology, the invention provides a rapid optical positioning method and device based on a TFT, and by utilizing the characteristic of TFT illumination sensitivity of a substrate layer, when the TFT is in a critical state, the TFT is conducted in an area receiving illumination within a set intensity range, and further the current from a source electrode to a drain electrode of the TFT is obviously changed; in the area which is not irradiated by the illumination within the set intensity range, the TFT can not be conducted, and the corresponding current can not be obviously changed; and then realize the location to the illumination position through detecting whether there is TFT electric current that changes to need not additionally to increase other location auxiliary component.
In order to achieve the above object, according to a first aspect of the present invention, there is provided a TFT substrate comprising: the TFT substrate is integrated with a TFT array which is arranged according to a set rule and used for positioning;
each of the first directional TFTs is connected by at least one first wire and supplies a control voltage;
each of the second directional TFTs 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.
According to a second aspect of the present invention, there is provided a TFT-based fast optical alignment method, using the TFT substrate; and controlling the TFT to be in a critical state, and determining whether the TFT is irradiated by light in a set intensity range by detecting whether the current or the voltage of the TFT changes, thereby determining the light-irradiated area.
According to a third aspect of the present invention, a TFT-based fast optical positioning method is provided, wherein the TFT substrate and the light emitting element are used, and the light emitting element emits an illumination surface within a set intensity range, and the illumination surface is circular, approximately circular, circular or approximately circular;
controlling all the TFTs to be in a critical state at the same time, detecting the change of current or voltage on all the second leads, and obtaining two boundary values of the illumination surface along the first direction; detecting the change of current or voltage on all the third wires to obtain two boundary values of the illumination surface along the second direction;
and respectively determining the coordinates of the central point of the illumination surface and the radius of the illumination surface based on the boundary values, and further directly positioning the area where the illumination surface is located.
According to a fourth aspect of the present invention, there is provided a TFT-based fast optical pointing device, comprising the TFT substrate;
at least one first resistor is connected between the second lead and the first power supply in series, one end of the first resistor connected with the second lead is connected to the first input end of a first comparator or a first amplifier, and the second input end of the first comparator or the first amplifier is input with a set voltage threshold Vref 1;
at least one second resistor is connected between the third wire and the second power supply in series, one end of the second resistor connected with the third wire is connected to the first input end of a second comparator or a second amplifier, and the second input end of the second comparator or the second amplifier is input with a set voltage threshold Vref 2;
the output of the first comparator or the first amplifier and the output of the second comparator or the second amplifier are used for detecting whether the current or the voltage of the TFT changes or not.
According to a fifth aspect of the present invention, there is provided a TFT-based fast optical pointing device, comprising the TFT substrate described above;
at least one first resistor is connected between the second lead and the first power supply in series, one end of the first resistor connected with the second lead is connected with a first analog switch, the output of the first analog switch is connected with the first input end of a first comparator or a first amplifier, and the second input end of the first comparator or the first amplifier is input with a set voltage threshold Vref 1;
at least one second resistor is connected between the third wire and the second power supply in series, one end of the second resistor connected with the third wire is connected to a second analog switch, the output of the second analog switch is connected to the first input end of a second comparator or a second amplifier, and the second input end of the second comparator or the second amplifier is input with a set voltage threshold Vref 2;
the output of the first comparator or the first amplifier and the output of the second comparator or the second amplifier are used for detecting whether the current or the voltage of the TFT changes or not.
According to a sixth aspect of the present invention, there is provided a TFT-based fast optical pointing device, comprising the TFT substrate;
at least one first resistor is connected between the second lead and the first power supply in series, one end of the first resistor connected with the second lead is connected to the first input end of a first comparator or a first amplifier, and the second input end of the first comparator or the first amplifier is input with a set voltage threshold Vref 1;
at least one second resistor is connected between the third wire and the second power supply in series, one end of the second resistor connected with the third wire is connected to a second analog switch, the output of the second analog switch is connected to the first input end of a second comparator or a second amplifier, and the second input end of the second comparator or the second amplifier is input with a set voltage threshold Vref 2;
the output of the first comparator or the first amplifier and the output of the second comparator or the second amplifier are used for detecting whether the current or the voltage of the TFT changes or not.
According to a seventh aspect of the present invention, there is provided a TFT-based fast optical pointing device, comprising the TFT substrate described above;
at least one first resistor is connected between the second lead and the first power supply in series, one end of the first resistor connected with the second lead is connected with a first analog switch, the output of the first analog switch is connected with the first input end of a first comparator or a first amplifier, and the second input end of the first comparator or the first amplifier is input with a set voltage threshold Vref 1;
at least one second resistor is connected between the third wire and the second power supply in series, one end of the second resistor connected with the third wire is connected to the first input end of a second comparator or a second amplifier, and the second input end of the second comparator or the second amplifier is input with a set voltage threshold Vref 2;
the output of the first comparator or the first amplifier and the output of the second comparator or the second amplifier are used for detecting whether the current or the voltage of the TFT changes or not.
According to an eighth aspect of the present invention, there is provided a liquid crystal writing apparatus comprising: the conductive layer, the bistable liquid crystal layer and the substrate layer are arranged in sequence; the TFT substrate is arranged on the base layer; and forming the TFT-based rapid optical positioning device based on the TFT substrate.
According to a ninth aspect of the present invention, there is provided electronic paper comprising: the conductive layer, the polar liquid crystal material layer and the substrate layer are arranged in sequence; the TFT substrate is arranged on the base layer; and forming the TFT-based rapid optical positioning device based on the TFT substrate.
According to a tenth aspect of the present invention, there is provided a liquid crystal display comprising: the conductive layer, the liquid crystal layer and the substrate layer are arranged in sequence; the TFT substrate is arranged on the base layer; and forming the TFT-based rapid optical positioning device based on the TFT substrate.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the invention, by utilizing the characteristic of TFT light sensitivity, the TFT is in a critical state, and when the TFT is irradiated by light with set light intensity, the TFT can be switched on, the current from the source electrode to the drain electrode of the TFT can be changed, so that the row position and the column position of the TFT can be determined, and the positioning by utilizing light can be realized.
After the positioning is realized, the handwriting can be controlled to be directly displayed at the positioned position, so that the writing can be realized through illumination without contacting with a writing device; and the handwriting can be positioned by illumination while writing, so that the writing handwriting can be recorded and stored.
(2) The invention connects the TFT output end (drain electrode) of each first array unit together to form a third lead; all TFTs are controlled to be in a critical state, and the illuminated area can be directly positioned by detecting the change of current or voltage on each second lead and each third lead, so that the illumination positioning speed and efficiency are greatly improved.
(3) According to the invention, an additional positioning element is not required, so that the occupation of writing space is reduced, the positioning cost is reduced, and the experience degree of a customer is improved.
(4) The rapid optical positioning method and the device are not only suitable for the illumination positioning of a bistable liquid crystal writing device or electronic paper, but also suitable for the illumination positioning of a common liquid crystal display.
Additional features and advantages 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 incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic diagram of a TFT-based fast optical pointing device using an open-loop operational amplifier according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a TFT-based fast optical pointing device using a comparator according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of another TFT-based fast optical pointing device employing a closed-loop operational amplifier according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a fast optical positioning apparatus based on TFT and using an analog switch according to an embodiment of the present invention;
FIG. 5(a) is a schematic diagram of a structure for generating a set threshold by a voltage regulator circuit according to an embodiment of the present invention;
FIG. 5(b) is a schematic diagram of a structure for generating a set threshold by a voltage divider circuit according to an embodiment of the present invention;
FIG. 5(c) is a schematic structural diagram of the generation of a set threshold by D/A conversion according to an embodiment of the present invention;
fig. 6 is a variation curve of the voltage difference Vgs between the gate and the source of the TFT and the switching current in the embodiment of the invention.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Example one
According to an embodiment of the present invention, there is disclosed a TFT substrate including: the TFT substrate is integrated with a TFT array which is arranged according to a set rule and used for positioning;
each of the first directional TFTs is connected by at least one first wire and supplies a control voltage;
each of the second directional TFTs 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 grid in different first directions is connected with different first wires; for the TFT in one first direction, the grid electrode can be connected with one or more first wires; when a first wire is connected, all the TFT grids in the first direction are connected together; when a plurality of first wires are connected, TFTs in the first direction are grouped, one first wire being connected to each group.
Similarly, the source electrodes of the TFTs in different second directions are connected with different second wires; for the TFT in one second direction, the source electrode can be connected with 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 conductive lines are connected, TFTs in the second direction are grouped, one second conductive line being connected to each group.
The TFT output end (namely the drain electrode) in different first directions is connected with different third wires; one or more third wires may be connected to the TFT output terminals in one of the first directions; when a third wire is connected, all the TFT drains in the first direction are connected together; when a plurality of second conductive lines are connected, TFTs in the first direction are grouped, one second conductive line being connected to each group.
In the present embodiment, each first direction and each second direction may be understood as each row and each column; except that the rows and columns may be arranged vertically in a horizontal and vertical orientation as is commonly understood.
The vertical arrangement can also be according to other setting directions, such as: on the basis that the rows and the columns are vertically arranged according to the horizontal and vertical directions, the rows and the columns are formed after rotating any angle, and the rows and the columns are still 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 above-mentioned rows and columns 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 arranged in a straight line, a curved line, a broken line, or a combination of at least two of the above arrangements.
As a preferred embodiment, the first direction is a horizontal direction and the second direction is a vertical direction; or the first direction is a vertical direction and the second direction is a horizontal direction.
The following embodiments describe the technical solutions 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 examples; other implementations of the TFT matrix arrangement are also the same.
Example two
According to an embodiment of the invention, a fast optical positioning method based on a TFT is disclosed, which comprises the TFT substrate described in the first embodiment.
And controlling the TFT to be in a critical state, and determining whether the TFT is irradiated by light with a set intensity range by detecting whether the input current or the input voltage of the TFT and the output current or the output voltage are changed, thereby determining the irradiated area. Wherein the area irradiated with light may include a position, a size, and a shape of the irradiated light.
In this embodiment, the critical state specifically includes: respectively applying a set control voltage and an input voltage to a grid electrode and a source electrode of the TFT; when receiving illumination within the set illumination intensity range, the TFT is conducted; when the TFT is not irradiated by light within the set light intensity range, the TFT is in a cut-off state.
If the grid electrode and the source electrode of the TFT are respectively applied with the set control voltage and the input voltage to ensure that the TFT is in an off state, the TFT can not be conducted even if the TFT receives illumination within the set illumination intensity range; even though ambient light may cause a change in the source-to-drain current of the TFT, such a change is negligible compared to the current when the TFT is turned on by illumination of a set intensity range in the critical state.
In this embodiment, the TFT control voltage is a voltage input through a gate of the TFT, and is used to control on and off of the TFT; the TFT input voltage is a voltage input through the TFT source, and the TFT output terminal is the TFT drain.
The voltages loaded on the grid electrode and the source electrode of the TFT are controlled to be in a critical state, at the moment, when the TFT receives illumination irradiation in a set intensity range, the current from the source electrode to the drain electrode of the TFT in the illumination range can be increased, namely, the current flowing through the grid electrode and the drain electrode of the TFT can be changed, and the illumination range can be determined by detecting the current change.
Furthermore, the current change flowing through the resistor can be converted into the voltage change at two ends of the resistor through the external resistor, so that the circuit detection is facilitated.
In the embodiment, the TFT is controlled to be in a critical state, and the light irradiation area is determined by detecting whether the current or the voltage of the TFT changes; wherein the light-irradiated area comprises the position, size and shape of the light irradiation; it is also understood that all the positions where the TFTs whose current or voltage changes are located, and the shapes and sizes of the positions are composed. Such as: the illumination area can be square, round, circular, triangular or polygonal.
The method of the present embodiment is described below by taking a column in which the first direction is a horizontal direction and the second direction is a vertical direction as an example.
When the position of the area irradiated by light is specifically determined, the present embodiment can be implemented in several ways as follows:
(1) determining the position of the row 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 light is positioned by detecting whether the output current or the output voltage of the TFT changes; i.e. which row or rows of all rows the TFTs whose current or voltage changes are located in.
Or, each time the TFTs on one row are individually controlled to be in the critical state and the other rows are in the cut-off state, whether the row receives illumination can be determined by detecting whether the output current or the output voltage of the TFTs changes; and traversing all the rows and determining the positions of the rows where the illumination is positioned.
Or, every time the TFT of the set row number is selected to be in a critical state, and the rest rows are in a cut-off state, whether the row receives illumination can be determined by detecting whether the output current or the output voltage of the TFT changes; and traversing all the rows and determining the positions of the rows where the illumination is positioned.
(2) Determining the position of the column in which the light is positioned:
controlling all TFTs to be in a critical state at the same time; determining the position of the column where the light is positioned by detecting whether the input current or the input voltage of the TFT changes; that is, it is determined which column or columns of all columns the TFTs whose current or voltage changes are in.
Or, each time the TFTs on one column are individually controlled to be in the critical state and the other columns are in the off state, by detecting whether the input current or the input voltage of the TFTs changes, it can be determined whether the column has received the illumination; and traversing all columns and determining the position of the column where the light is positioned.
Or, every time the TFT with the set number of columns is selected to be in a critical state, and the rest columns are in a cut-off state, whether the columns receive illumination can be determined by detecting whether the input current or the input voltage of the TFT changes; and traversing all columns and determining the position of the column where the light is positioned.
As a specific embodiment, a specific method of determining the illumination area may adopt a combination of the above-described methods of determining the column position and determining the row position; there are various optional combination modes, and the specific implementation mode is as follows:
the first method is as follows:
and controlling all the TFTs to be in a critical state at the same time, respectively detecting whether the current or the voltage of the TFTs on each second lead and each third lead is changed, and determining the light irradiation area.
It will be appreciated that the detection of a change in TFT current or voltage on the second conductor and the detection of a change in TFT current or voltage on the third conductor may be performed simultaneously and without interference from each other.
The second method comprises the following steps:
each time all the TFTs on one row are independently controlled to be in a critical state at the same time, whether the output current or the output voltage of the TFTs on the third lead corresponding to the row changes or not is detected, and whether the row is illuminated in a set intensity range or not is determined; if not, entering the next row for detection; if yes, whether the input current or the input voltage of the TFT on each second conducting wire changes is detected, and then which columns of the row receive the illumination within the set intensity range is determined.
The above process is repeated until all the positions of the light irradiation can be determined.
The third method comprises the following steps:
each time all TFTs on the selected set row number are controlled to be in a critical state, whether the output current or the output voltage of the TFTs on the third conducting wire corresponding to the set row changes or not is detected, and whether the set row is illuminated in a set intensity range or not is determined; if not, entering the detection of the next set of setting rows; if yes, the method of the mode two is adopted in the set row to carry out row-by-row detection.
The above process is repeated until all the positions of the light irradiation can be determined.
The method is as follows:
each time all the TFTs on one column are independently controlled to be in a critical state at the same time, whether the output current or the output voltage of the TFTs on the second lead corresponding to the column changes or not is detected, and whether the column is illuminated in a set intensity range or not is determined; if not, entering the detection of the next column; if yes, whether the input current or the input voltage of the TFT on each third conducting wire changes is detected, and then the rows of the row receive the illumination within the set intensity range is determined.
The above process is repeated until all the positions of the light irradiation can be determined.
The fifth mode is as follows:
every time all TFTs on the selected set row number are controlled to be in a critical state, whether the output current or the output voltage of the TFTs on the second conducting wire corresponding to the set row changes or not is detected, and whether the set row is illuminated in a set intensity range or not is determined; if not, entering the detection of the next set of setting columns; if yes, the method of the fourth mode is adopted in the set row to carry out row-by-row detection.
The above process is repeated until all the positions of the light irradiation can be determined.
As an optional implementation manner, based on the TFT substrate disclosed in the first embodiment, a light emitting element is combined, where the light emitting element emits an illumination surface within a set intensity range, and the illumination surface is circular, approximately circular, circular ring-shaped, or approximately circular ring-shaped; wherein, the approximate circle or the approximate circular ring is the shape very close to the circle or the circular ring, such as: the regular polygon may be approximately circular if the sides are sufficiently large.
When the illumination surface is in the shape, the rotation of the illumination surface does not cause the change of the positioning area, and the illumination position can be directly positioned according to the boundary without further scanning the area in the boundary range to judge the specific position of the illumination surface; the specific positioning method comprises the following steps:
controlling all the TFTs to be in a critical state at the same time, detecting the change of current or voltage on all the second leads, obtaining two boundary values of the illumination surface along the first direction, averaging the two boundary values, and taking the obtained average value as the abscissa position of the central point along the first direction; detecting the change of current or voltage on all the third leads to obtain two boundary values of the illumination surface along the second direction, and averaging the two boundary values to obtain an average value as a longitudinal coordinate position of the central point along the second direction; half of the absolute value of the difference between the two boundary values in any direction is taken as the radius of the illumination surface; thereby directly positioning the area where the light irradiation surface is located.
In addition, for regular polygons or other regular shapes, positioning can be performed by the method described above, but the reaction speed is slightly slow.
In this embodiment, in order to improve the positioning speed, it is considered that the illumination position (handwriting) does not generally move in a large range, and therefore, when the light spot position is detected at the next time, the detection is performed within a set area around the light spot position detected at the previous time; and if the illumination position cannot be detected, detecting in the global range.
In the above-described detection of the column position and the row position, the TFTs in the remaining columns or rows other than the threshold off state are controlled to be in the off state.
It should be noted that, for other structural forms in which the first direction and the second direction intersect, the manner of achieving the fast optical positioning is substantially the same as the above process, and is not described in detail.
EXAMPLE III
According to an embodiment of the present invention, an embodiment of a fast optical positioning device based on TFT is disclosed, which is combined with fig. 1 to 6, and includes a TFT substrate as described in the first embodiment;
at least one first resistor is connected between the second lead and the first power supply in series, one end of the first resistor connected with the second lead is connected to a first input end of a first comparator or a first amplifier, and a second input end of the first comparator or the first amplifier inputs a set voltage threshold;
at least one second resistor is connected between the third wire and the second power supply in series, one end of the second resistor connected with the third wire is connected to a first input end of a second comparator or a second amplifier, and a second input end of the second comparator or the second amplifier inputs a set voltage threshold;
the output of the first comparator or the first amplifier and the output of the second comparator or the second amplifier are used for detecting whether the current or the voltage of the TFT changes or not.
It should be noted that the first resistor connected in series may be one resistor, or may be formed by connecting a plurality of resistors in series or in parallel, and the connection of a plurality of resistors in series or in parallel is also equivalent to one resistor.
In this embodiment, the first power supply and the second power supply may be a positive power supply, a negative power supply, or GND.
Optionally, the method may further include:
and the control unit is directly connected with the output end of each comparator or amplifier or is connected with the output end of each comparator or amplifier through an encoder or a shift register and is used for positioning the turned-on TFT according to the output of the comparator or amplifier.
The pins can be extended when the output of each comparator or amplifier is connected to the control unit via an encoder or shift register.
Of course, all the first wires and the second wires are respectively connected with corresponding voltage driving devices for providing voltages required by illumination positioning for the corresponding wires.
FIGS. 1-4 show the detailed structure of the TFT-based fast optical pointing device of the present embodiment; referring to fig. 1, a resistor R1i is connected in series between the second wire of each column and the first power source Vsc1, one end of the resistor R1i connected to the second wire is connected to the first input terminal of the first operational amplifier, the second input terminal of the first operational amplifier is inputted with a set voltage threshold Vref1, and the output of the first operational amplifier is directly connected to the set pin of the control unit or connected to the set pin of the control unit through the shift register.
A resistor R2j is connected in series between the third wire and GND corresponding to each row, one end of the resistor R2j connected with the third wire is connected to the first input end of the second operational amplifier, the second input end of the second operational amplifier inputs a set voltage threshold Vref2, and the output of the second operational amplifier is directly connected to the setting pin of the control unit or connected to the setting pin of the control unit through a shift register. Wherein i =1,2, …, n; n represents the number of columns, j =1,2, …, m; m represents the number of rows.
As another embodiment, the first operational amplifier and the second operational amplifier in the configuration shown in fig. 1 may be all replaced with comparators, or one of them may be replaced with a comparator; such as: fig. 2 is a schematic diagram showing a structure in which the first operational amplifier is replaced with a comparator.
As another embodiment, referring to fig. 3, a resistor R3 and a resistor R4 are further added to the first operational amplifier shown in fig. 1, that is, one end of the resistor R11 connected to the second wire is connected in series with the resistor R3 and then connected to the first input terminal of the first operational amplifier; a resistor R4 is connected in series between the first input end and the output end of the first operational amplifier; the second input end of the first operational amplifier inputs a set voltage threshold Vref1, and the output of the first operational amplifier is directly connected to the set pin of the control unit or connected to the set pin of the control unit through a shift register.
Of course, the second operational amplifier in fig. 1 may also have the above-described configuration, and thus, the amplified output of the detection signal can be realized.
As another embodiment, referring to fig. 4, a resistor R1 is connected in series between the second conductive line of each column and the first power source Vsc1, one end of the resistor R1 of all columns connected to the second conductive line is connected to an analog switch, the output of the analog switch is connected to the first input terminal of the comparator, and the second input terminal of the comparator is inputted with a set voltage threshold Vref 1; the output of the comparator is directly connected to the setting pin of the control unit or connected to the setting pin of the control unit through the shift register.
Similarly, the third conducting wire of each row can also adopt the above mode of connecting the analog switches;
the analog switch can gate the needed output column or row, which can control column or row by row or select column or select row. Of course, the comparator connected to the analog switch in fig. 4 may be replaced by an operational amplifier, and the same effect can be achieved.
Of course, the combination of the two modes of accessing the comparator or the amplifier through the analog switch and directly accessing the comparator or the amplifier can also be adopted; such as:
a first resistor is connected between the second wire and the first power supply in series, one end of the first resistor connected with the second wire is connected to a first input end of a first comparator or a first amplifier, and a second input end of the first comparator or the first amplifier inputs a set voltage threshold;
a second resistor is connected between a third lead and a second power supply in series, one end of the second resistor connected with the third lead is connected with a second analog switch, the output of the second analog switch is connected with a first input end of a second comparator or a second amplifier, and a second input end of the second comparator or the second amplifier inputs a set voltage threshold;
the output of the first comparator or the first amplifier and the output of the second comparator or the second amplifier are used for detecting whether the current or the voltage of the TFT changes or not.
Alternatively, the first and second electrodes may be,
a first resistor is connected between the second lead and the first power supply in series, one end of the first resistor connected with the second lead is connected with a first analog switch, the output of the first analog switch is connected with the first input end of a first comparator or a first amplifier, and the second input end of the first comparator or the first amplifier inputs a set voltage threshold;
a second resistor is connected between the third wire and the second power supply in series, one end of the second resistor connected with the third wire is connected to a first input end of a second comparator or a second amplifier, and a set voltage threshold is input to a second input end of the second comparator or the second amplifier;
the output of the first comparator or the first amplifier and the output of the second comparator or the second amplifier are used for detecting whether the current or the voltage of the TFT changes or not.
In the above-mentioned apparatus disclosed in this embodiment, the voltage across the resistor R1 or the resistor R2 is compared with a set voltage threshold, and if the difference between the two is greater than the set threshold, the output of the comparator or the amplifier will be inverted.
In the present embodiment, the first power source Vsc1 > the second power source Vsc2, or the first power source Vsc1 < the second power source Vsc 2; the voltage threshold Vref1 and the voltage threshold Vref2 may be equal or different.
Taking the first column of TFTs as an example, if no TFT in the column is turned on, the voltage across the voltage dividing resistor R1 is zero; one input end of the first operational amplifier is Vsc, the other end of the first operational amplifier is Vref = Vsc- Δ V, and the output of the first operational amplifier is GND at the moment. DeltaV is set as required for the set detection sensitivity, and in general, DeltaV is not less than 10 (V)Drift of+VDisorder of) Wherein V isDrift ofA drift voltage of a comparator or an operational amplifier; vDisorder ofIs the offset voltage of a comparator or an operational amplifier.
If the column has TFT on, the voltage V across the divider resistor R1RThe input end of the first operational amplifier is Vsc-VRAnd Vref = Vsc- Δ V at the other end, due to VRAnd when the voltage difference value of the two input ends of the first operational amplifier is larger than the set threshold value, the output of the first operational amplifier is Vcc, and inversion occurs.
Similarly, the operation of the second operational amplifier connected to the third conductor of each row also uses the same principle.
In this embodiment, the set voltage thresholds Vref1 and Vref2 may be generated by a voltage divider circuit, or generated by D/a conversion, or generated by a voltage regulator circuit.
Fig. 5(a) - (c) show several circuit configurations for generating the set threshold, respectively. FIG. 5(a) is a schematic diagram of a configuration of generating a set threshold Vref by a voltage regulator circuit; FIG. 5(b) is a schematic diagram of a structure for generating a set threshold Vref by a voltage divider circuit; fig. 5(c) is a schematic diagram of a structure for generating the set threshold Vref by D/a conversion. Of course, other circuit configurations may be implemented by those skilled in the art.
Based on the above-mentioned fast optical positioning apparatus based on TFT, in combination with the method disclosed in the first embodiment, the specific implementation process of this embodiment is as follows:
controlling all TFTs to be in a critical state at the same time, and judging whether the current or the voltage of the TFTs is changed or not in corresponding columns and rows by detecting whether the outputs of a first comparator or a first amplifier and a second comparator or a second amplifier are overturned or not; the row position and the column position of the illumination can be directly determined.
Specifically, all TFTs are made to be in a critical state by controlling an input voltage of a source electrode and a control voltage of a gate electrode of the TFTs;
at this time, when a certain area receives the irradiation of the set illumination intensity, the current from the source electrode to the drain electrode of the TFT corresponding to the area changes; because the resistance of the voltage dividing resistor is large enough, the voltage V divided by the resistor R1 at this timeR1The voltage is input to a first input terminal of the first comparator or the first amplifier, and the set threshold voltage Vref1 is input to a second input terminal of the first comparator or the first amplifier.
At this time, VR1The difference from Vref1 exceeds a set threshold, and the output of the first comparator or first amplifier flips.
In the area not irradiated by the light with the set intensity, the TFT can not be conducted, the current from the source electrode to the drain electrode of the TFT can not be changed, and the output of the first comparator or the first amplifier can not be overturned.
If the output of the first comparator or the first amplifier is inverted, the current from the source electrode to the drain electrode of the TFT in the column where the first comparator or the first amplifier is located is changed, and therefore the position of the column where the light is located is determined.
Similarly, the voltage V divided by the resistor R2R2The voltage is input to a first input terminal of a second comparator or a second amplifier, and the set threshold voltage Vref2 is input to a second input terminal of the second comparator or the second amplifier.
At this time, VR2The difference from Vref2 exceeds a set threshold, and the output of the second comparator or second amplifier flips.
In the area not irradiated by the light with the set intensity, the TFT cannot be conducted, the current from the source electrode to the drain electrode of the TFT cannot be changed, and the output of the corresponding second comparator or the second amplifier cannot be inverted.
If the output of the second comparator or the second amplifier is inverted, the current from the source electrode to the drain electrode of the TFT is changed in the row where the second comparator or the second amplifier is located, and therefore the row position where the light is located is determined.
Of course, the illumination position may also be determined in the form of row by row or selected set row, or column by column or selected set column as described in the second embodiment, but the positioning speed is not as fast as that of the above process, and the efficiency is high.
Referring to fig. 6, the critical state of the present embodiment is the interval T1, the cut-off state is the interval T2, and the interval T1 and the interval T2 satisfy the following relationship:
the minimum value of the off-leakage current of the interval T1 is at least n times larger than the maximum value of the current of the interval T2; wherein the value of n can be determined according to the number (row number) of the first conductive lines in the base layer and the illumination intensity.
In the present embodiment, the number of TFTs may be determined as needed for the optical positioning accuracy.
Example four
According to an embodiment of the present invention, there is disclosed an embodiment of a liquid crystal writing apparatus including: the conductive layer, the bistable liquid crystal layer and the substrate layer are arranged in sequence; the TFT substrate of the first embodiment is arranged on the base layer; and forming the TFT-based rapid optical positioning device of the third embodiment on the basis of the TFT substrate.
The liquid crystal writing device of the embodiment adopts the method disclosed in the second embodiment to position the illumination area, and further realizes that the writing handwriting is positioned and recorded while writing according to the positioning position, so that the next check is facilitated.
And the erasing of the positioning position can also be realized by controlling the voltage of the conducting layer and the substrate layer of the positioning position according to the positioning position.
In addition, according to the positioning position, the positioning position can be electrically driven and displayed directly through voltage control between the base layer and the conductive layer without contact, namely, the image which is set randomly can be controlled and displayed at the set position.
EXAMPLE five
According to an embodiment of the present invention, there is disclosed an embodiment of an electronic paper, including: the conductive layer, the polar liquid crystal material layer and the substrate layer are arranged in sequence; the TFT substrate of the first embodiment is arranged on the base layer; and forming the TFT-based rapid optical positioning device of the third embodiment on the basis of the TFT substrate.
The electronic paper of the embodiment adopts the method disclosed in the second embodiment to position the illumination area, so that the writing handwriting can be positioned and recorded while writing according to the positioning position, and the next checking is facilitated.
And the erasing of the positioning position can also be realized by controlling the voltage of the conducting layer and the substrate layer of the positioning position according to the positioning position.
In addition, according to the positioning position, the positioning position can be electrically driven and displayed directly through voltage control between the base layer and the conductive layer without contact, namely, the image which is set randomly can be controlled and displayed at the set position.
EXAMPLE six
According to an embodiment of the present invention, there is disclosed an embodiment of a general liquid crystal display including: the conductive layer, the polar liquid crystal material layer and the substrate layer are arranged in sequence; the TFT substrate of the first embodiment is arranged on the base layer; and forming the TFT-based rapid optical positioning device of the third embodiment on the basis of the TFT substrate.
The liquid crystal display of the embodiment adopts the method disclosed in the second embodiment to position the illumination area, so that the writing handwriting can be positioned and recorded while writing according to the positioning position, and the next checking is facilitated; and the erasing of the positioning position can also be realized by controlling the voltage of the conducting layer and the substrate layer of the positioning position according to the positioning position.
In addition, according to the positioning position, the positioning position can be electrically driven and displayed directly through voltage control between the base layer and the conductive layer without contact, namely, the image which is set randomly can be controlled and displayed at the set position.
The liquid crystal display in the embodiment can be an electronic product such as a mobile phone, a tablet, a notebook computer, a television screen and the like.
Certainly, because the display process of the common liquid crystal display also needs to control the original TFT array for realizing display, the TFT array for realizing rapid optical positioning can be arranged in a staggered manner with the original TFT array on the basis of the original TFT array, and the number of the TFT arrays for realizing rapid optical positioning can be set according to the requirement of detection precision; meanwhile, the original TFT for realizing display is shaded, so that the influence of illumination on the normal display of the display is avoided.
Alternatively, the TFT array for achieving fast optical alignment may be laid out one layer by one layer, so that the positions and the number thereof may be set as desired.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.

Claims (28)

1. A TFT substrate, comprising: the TFT substrate is integrated with a TFT array which is arranged according to a set rule and used for positioning;
each TFT in the first direction is directly connected by at least one first wire and supplies a control voltage;
each of the second directional TFTs is directly connected by at least one second wire and supplies an input voltage;
the output terminals of the TFTs in each first direction are directly connected by at least one third wire.
2. The TFT substrate of claim 1, further integrated with a TFT pixel array for display; the number of TFT arrays used for positioning and the number of TFT pixel arrays used for displaying are the same or different.
3. The TFT substrate of claim 1, wherein the first direction intersects the second direction perpendicularly or at a predetermined angle.
4. The TFT substrate according to claim 1, wherein the first direction is a horizontal direction and the second direction is a vertical direction; or, the first direction is a vertical direction, and the second direction is a horizontal direction.
5. The TFT substrate of claim 1, wherein the TFTs in the first or second direction are arranged in a straight line, a curved line, a broken line, or a combination of at least two of the above arrangements.
6. A TFT-based fast optical alignment method, using the TFT substrate of claim 1;
and controlling the TFT to be in a critical state, and determining whether the TFT is irradiated by light in a set intensity range by detecting whether the current or the voltage of the TFT changes, thereby determining the light-irradiated area.
7. The TFT-based fast optical locating method according to claim 6, wherein all TFTs are controlled to be in a critical state at the same time, and whether the current or the voltage of the TFT on each of the second conducting wire and the third conducting wire changes or not is detected respectively, so as to determine the light irradiation area.
8. The fast optical positioning method based on TFT according to claim 6, wherein, each time all TFTs in one first direction are independently controlled to be in a critical state at the same time, whether the current or voltage of TFT on each second conducting wire and the third conducting wire corresponding to the first direction changes is respectively detected, and whether the first direction is irradiated by light and the position of the light irradiation are determined;
the above process is repeated until all the positions of the light irradiation can be determined.
9. The fast optical positioning method based on TFT according to claim 6, characterized in that, every time all TFTs in a set number of first directions are controlled to be in a critical state, each second conductive line and each third conductive line corresponding to the set number of first directions are respectively detected whether the current or voltage of the TFT changes, and whether the set number of first directions are irradiated by light and the position of the light irradiation are determined;
the above process is repeated until all the positions of the light irradiation can be determined.
10. The fast optical positioning method based on TFT according to claim 6, wherein, each time all TFTs in one of the second directions are independently controlled to be in the critical state at the same time, whether the current or voltage of the TFT on the second wire and each third wire corresponding to the second direction changes is respectively detected, and whether the second direction is irradiated by light and the position of the light irradiation are determined;
the above process is repeated until all the positions of the light irradiation can be determined.
11. The fast optical positioning method based on TFT according to claim 6, characterized in that, each time controlling all TFTs in a set number of second directions to be in a critical state, detecting whether the current or voltage of TFT on the second wire and each third wire corresponding to the set number of second directions changes, respectively, determining whether the set number of second directions are irradiated by light and the position of the light irradiation;
the above process is repeated until all the positions of the light irradiation can be determined.
12. A TFT-based fast optical positioning method, wherein the TFT substrate and the light emitting device of claim 1 are used, the light emitting device emits an illumination surface within a predetermined intensity range, and the illumination surface is circular, approximately circular, circular or approximately circular;
controlling all the TFTs to be in a critical state at the same time, detecting the change of current or voltage on all the second leads, and obtaining two boundary values of the illumination surface along the first direction; detecting the change of current or voltage on all the third wires to obtain two boundary values of the illumination surface along the second direction;
and respectively determining the coordinates of the central point of the illumination surface and the radius of the illumination surface based on the boundary values, and further directly positioning the area where the illumination surface is located.
13. The method according to any one of claims 6 to 12, wherein when detecting the illumination area at the next time, the detection is performed within a predetermined area around the illumination area detected at the previous time.
14. A TFT-based fast optical pointing device comprising the TFT substrate of claim 1;
at least one first resistor is connected between the second lead and the first power supply in series, one end of the first resistor connected with the second lead is connected to the first input end of a first comparator or a first amplifier, and the second input end of the first comparator or the first amplifier is input with a set voltage threshold Vref 1;
at least one second resistor is connected between the third wire and the second power supply in series, one end of the second resistor connected with the third wire is connected to the first input end of a second comparator or a second amplifier, and the second input end of the second comparator or the second amplifier is input with a set voltage threshold Vref 2;
the output of the first comparator or the first amplifier and the output of the second comparator or the second amplifier are used for detecting whether the current or the voltage of the TFT changes or not.
15. A TFT-based fast optical pointing device comprising the TFT substrate of claim 1;
at least one first resistor is connected between the second lead and the first power supply in series, one end of the first resistor connected with the second lead is connected with a first analog switch, the output of the first analog switch is connected with the first input end of a first comparator or a first amplifier, and the second input end of the first comparator or the first amplifier is input with a set voltage threshold Vref 1;
at least one second resistor is connected between the third wire and the second power supply in series, one end of the second resistor connected with the third wire is connected to a second analog switch, the output of the second analog switch is connected to the first input end of a second comparator or a second amplifier, and the second input end of the second comparator or the second amplifier is input with a set voltage threshold Vref 2;
the output of the first comparator or the first amplifier and the output of the second comparator or the second amplifier are used for detecting whether the current or the voltage of the TFT changes or not.
16. A TFT-based fast optical pointing device comprising the TFT substrate of claim 1;
at least one first resistor is connected between the second lead and the first power supply in series, one end of the first resistor connected with the second lead is connected to the first input end of a first comparator or a first amplifier, and the second input end of the first comparator or the first amplifier is input with a set voltage threshold Vref 1;
at least one second resistor is connected between the third wire and the second power supply in series, one end of the second resistor connected with the third wire is connected to a second analog switch, the output of the second analog switch is connected to the first input end of a second comparator or a second amplifier, and the second input end of the second comparator or the second amplifier is input with a set voltage threshold Vref 2;
the output of the first comparator or the first amplifier and the output of the second comparator or the second amplifier are used for detecting whether the current or the voltage of the TFT changes or not.
17. A TFT-based fast optical pointing device comprising the TFT substrate of claim 1;
at least one first resistor is connected between the second lead and the first power supply in series, one end of the first resistor connected with the second lead is connected with a first analog switch, the output of the first analog switch is connected with the first input end of a first comparator or a first amplifier, and the second input end of the first comparator or the first amplifier is input with a set voltage threshold Vref 1;
at least one second resistor is connected between the third wire and the second power supply in series, one end of the second resistor connected with the third wire is connected to the first input end of a second comparator or a second amplifier, and the second input end of the second comparator or the second amplifier is input with a set voltage threshold Vref 2;
the output of the first comparator or the first amplifier and the output of the second comparator or the second amplifier are used for detecting whether the current or the voltage of the TFT changes or not.
18. A TFT-based fast optical pointing device according to any one of claims 14-17, wherein the set voltage threshold is generated by a voltage divider circuit, or by D/a conversion, or by a voltage adjustment circuit.
19. A TFT-based fast optical pointing device according to any one of claims 14-17, further comprising: a control unit;
the control unit is connected with the output end of the first comparator or the first amplifier, or the control unit is connected with the output end of the first comparator or the first amplifier through the encoder or the shift register;
the control unit is connected with the output end of the second comparator or the second amplifier, or the control unit is connected with the output end of the second comparator or the second amplifier through the encoder or the shift register.
20. A liquid crystal writing apparatus, comprising: the conductive layer, the bistable liquid crystal layer and the substrate layer are arranged in sequence; the TFT substrate according to claim 1 is provided on the base layer; forming the TFT-based fast optical pointing device of any one of claims 14-17 based on the TFT substrate.
21. The liquid crystal writing apparatus of claim 20, wherein the fast optical TFT-based positioning device is used for positioning the illuminated area, and recording or erasing of writing is performed according to the positioning position.
22. The liquid crystal writing apparatus of claim 20, wherein the TFT-based fast optical pointing device is used to locate the illuminated area, and the liquid crystal writing apparatus is controlled to display according to the located position.
23. An electronic paper, comprising: the conductive layer, the polar liquid crystal material layer and the substrate layer are arranged in sequence; the TFT substrate according to claim 1 is provided on the base layer; forming the TFT-based fast optical pointing device of any one of claims 14-17 based on the TFT substrate.
24. The electronic paper as claimed in claim 23, wherein the TFT-based fast optical positioning device is used to position the illuminated area, so as to record or erase handwriting according to the position.
25. The electronic paper of claim 23, wherein the TFT-based fast optical pointing device is used to locate an illuminated area, and the liquid crystal writing device is controlled to display according to the located position.
26. A liquid crystal display, comprising: the conductive layer, the liquid crystal layer and the substrate layer are arranged in sequence; the TFT substrate according to claim 1 is provided on the base layer; forming the TFT-based fast optical pointing device of any one of claims 14-17 based on the TFT substrate.
27. The liquid crystal display as claimed in claim 26, wherein the fast optical TFT-based positioning device is used to position the illuminated area, so as to record or erase the handwriting according to the position.
28. The liquid crystal display of claim 26, wherein the TFT-based fast optical pointing device is used to locate the illuminated area, and the liquid crystal writing device is controlled to display according to the located position.
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