CN106354345B - Touch unit, touch module, embedded touch screen and display device - Google Patents

Abstract

The present invention provides a touch control unit, a touch control module, an embedded touch screen and a display device. The touch unit bridge, the first bridge arm, the second bridge arm, and the third bridge arm are respectively provided with a first fixed resistance unit, a second fixed resistance unit, and a third fixed resistance unit, and the other A light-sensing control module is arranged on the bridge arm; the light-sensing control module includes: a control switch, the control end is connected to the touch scan line, and the first end is connected to the high-level output end; and, a photoresistor unit, the first end is connected to the control The second end of the switch is connected, and the second end is respectively connected with the second end of the third fixed resistor and the touch reading line. The present invention solves the problem in the prior art that the illumination cannot be converted into electrical signals accurately and quickly and transmitted to the touch reading line, thus resulting in the inability to accurately detect the touch and determine the touch position.

Description

Touch unit, touch module, in-cell touch screen and display device

technical field

The present invention relates to the technical field of touch control, and in particular, to a touch control unit, a touch control module, an in-cell touch screen and a display device.

Background technique

With the rapid development of display technology, touch screens have gradually spread throughout people's lives. At present, according to the principle classification, touch screens include: resistive sensing touch screens, capacitive sensing touch screens, optical sensing touch screens, and the like. Among them, the optical sensing touch screen, as the next generation touch sensing technology, is not limited in the size of the screen, and the product produced has a long life and is relatively stable, which can solve the problems of signal interference and signal delay. However, the existing optical sensor type touch screen cannot accurately and quickly convert the light into electrical signals and transmit them to the touch readout line, resulting in the inability to accurately detect the touch and determine the touch position.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to provide a touch unit, a touch module, an in-cell touch screen and a display device, which can solve the problem that the prior art cannot accurately and quickly convert light into electrical signals and transmit them to the touch reading line , resulting in the inability to accurately detect the touch and determine the touch position.

In order to achieve the above object, the present invention provides a touch control unit, which is respectively connected to a touch scan line and a touch read line. The touch control unit includes an electric bridge, the first bridge arm of the electric bridge and the second The bridge arm and the third bridge arm are respectively provided with a first fixed resistance unit, a second fixed resistance unit and a third fixed resistance unit, and a light sensing control module is arranged on the other bridge arm of the electric bridge;

The first end of the first fixed resistance unit is connected to the high-level output end, the second end of the first fixed resistance unit is respectively connected to the reference voltage output end and the first end of the second fixed resistance unit, The second end of the second fixed resistance unit is respectively connected to the first end and the low level output end of the third fixed resistance unit;

The light sensing control module includes:

a control switch, the control terminal is connected to the touch scan line, and the first terminal is connected to the high-level output terminal; and,

In the photoresistor unit, the first end is connected to the second end of the control switch, and the second end is respectively connected to the second end of the third fixed resistor and the touch reading line.

During implementation, the touch control unit of the present invention further includes an electrostrictive unit; the electrostrictive unit includes:

a phototransistor, the gate and the first electrode are connected to the second end of the photoresistor unit;

a storage capacitor, the first terminal is connected to the second pole of the phototransistor, and the second terminal is connected to the low-level output terminal;

In the electrostrictive device, the first end is connected to the first end of the storage capacitor, and the second end is connected to the second end of the storage capacitor.

During implementation, the second end of the photoresistor unit is connected to the read node;

Also included between the read node and the touch read line:

A differential amplifier, the non-inverting input terminal is connected to the read node, the inverting input terminal is connected to the reference voltage output terminal, and the output terminal is connected to the touch reading line.

The present invention also provides a touch module, which includes M rows of touch scan lines and N columns of touch read lines that are crossed horizontally and vertically, and further includes a touch scan line formed by the touch scan lines and the touch read lines Limited multi-row and multi-column touch sub-units; N and M are both positive integers;

The touch control sub-unit in the mth row and the nth column includes a light sensing control module in the mth row and the nth column; m is a positive integer less than or equal to M, and n is a positive integer less than or equal to N;

The light sensing control module of the mth row and the nth column includes:

The mth row and the nth column control the switch, the control terminal is connected to the touch scan line of the mth row, and the first terminal is connected to the high-level output terminal; and,

The first end of the photosensitive resistor unit in the mth row and the nth column is connected to the second end of the control switch in the mth row and the nth column, and the second end is in contact with the second end of the third fixed resistor and the nth column respectively. Control reading line connection;

The touch module further includes N column sharing units;

The nth column common unit includes:

the first fixed resistance unit, the first end is connected to the high-level output end, and the second end is connected to the reference voltage output end;

The second fixed resistance unit, the first end is connected to the second end of the first fixed resistance unit, and the second end is connected to the low-level output end;

In the third fixed resistance unit, the first terminal is connected to the low-level output terminal, and the second terminal is respectively connected to the second terminals of all the photoresistor units located in the nth column.

During implementation, the touch control sub-unit in the m-th row and the n-th column further includes an electrostrictive unit in the m-th row and the n-th column;

The electrostrictive unit in the m-th row and the n-th column includes:

The phototransistor in the mth row and the nth column has a gate electrode and a first electrode connected to the second end of the photosensitive resistor unit in the mth row and the nth column;

The storage capacitor of the mth row and the nth column has a first terminal connected to the second pole of the phototransistor of the mth row and the nth column, and the second terminal is connected to the low-level output terminal;

The electrostrictive device in the mth row and the nth column has a first terminal connected to the first terminal of the mth row and nth column storage capacitor, and a second terminal connected to the second terminal of the mth row and nth column storage capacitor. .

During implementation, the n-th column sharing unit further includes a differential amplifier;

In the differential amplifier, the non-inverting input terminal is connected to the second terminals of all photoresistor units located in the nth column, the inverting input terminal is connected to the reference voltage output terminal, and the output terminal is connected to the nth column touch reading line connection.

During implementation, the touch module of the present invention further includes a touch scanning unit and a touch reading unit;

The touch scanning units are respectively connected with the M rows of touch scanning lines, and are used for sequentially sending corresponding touch scanning signals to the M rows of touch scanning lines in the touch stage;

The touch reading units are respectively connected to the N columns of touch reading lines, and are used for determining whether there is a touch and determining a touch position by reading the voltage on each of the touch reading lines.

The present invention also provides an in-cell touch screen, including the above touch module.

During implementation, the in-cell touch screen of the present invention further includes an array substrate and a plurality of rows of grid lines disposed on the array substrate;

The gate lines are multiplexed as touch scan lines included in the touch module.

The present invention also provides a display device including the above-mentioned in-cell touch screen.

Compared with the prior art, the touch unit, touch module, in-cell touch screen and display device of the present invention include an electric bridge, and a light-sensing control module is arranged on one of the bridge arms of the electric bridge. , and the photosensitive control module includes a control switch and a photoresistor unit, and the light reflected by the finger when touched is received by the photoresistor unit to change its resistance, so that the potential of the second end of the photoresistor unit changes, so that it can be accurately and quickly The detection of the potential of the second end of the photoresistor unit determines whether there is a touch and determines the touch position.

Description of drawings

FIG. 1 is a structural diagram of a touch control unit according to an embodiment of the present invention;

FIG. 2 is a circuit diagram of a touch control unit according to another embodiment of the present invention;

3 is a schematic diagram of a differential amplifier included in a preferred embodiment of the touch control unit according to the present invention;

FIG. 4 is a circuit diagram of a specific embodiment of the touch module according to the present invention;

5 is a schematic diagram of the voltages of the gate drive signal output by Gate1, the gate drive signal output by Gate2, VRx1 and Vout in one case when the touch module shown in FIG. 4 is in operation;

6A is a schematic diagram of the expansion and contraction of the electrostrictive device ES when no voltage is applied to both ends;

FIG. 6B is a schematic diagram of the expansion and contraction of the electrostrictive device ES when V1 is applied to both ends.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

As shown in FIG. 1 , the touch unit according to the embodiment of the present invention is connected to the touch scan line SL and the touch read line TRL respectively;

The touch control unit includes an electric bridge, and the first bridge arm, the second bridge arm and the third bridge arm of the electric bridge are respectively provided with a first fixed resistance unit 11 , a second fixed resistance unit 12 and a third fixed resistance Unit 13, another bridge arm of the electric bridge is provided with a light sensing control module 14;

The first end of the first fixed resistance unit 11 is connected to the high level output end that outputs a high level VDD, and the second end of the first fixed resistance unit 11 is connected to the reference voltage output end REF and the second end respectively. The first end of the fixed resistance unit 12 is connected, and the second end of the second fixed resistance unit 12 is respectively connected with the first end of the third fixed resistance unit 13 and the low level output end of the output low level VSS;

The light sensing control module 14 includes:

the control switch 141, the control terminal is connected to the touch scan line SL, and the first terminal is connected to the high-level output terminal that outputs the high-level VDD; and,

The first end of the photoresistor unit 142 is connected to the second end of the control switch 141 , and the second end is respectively connected to the second end of the third fixed resistance unit 13 and the touch read line TRL.

The touch control unit according to the embodiment of the present invention includes an electric bridge, and adopts a light-sensing control module on one of the bridge arms of the electric bridge, and the light-sensing control module includes a control switch and a photoresistor unit, which receives the signal through the photoresistor unit. When the finger is touched, the light reflected by the finger changes its resistance, so that the potential of the second end of the photoresistor unit changes, so that it can accurately and quickly detect the potential of the second end of the photoresistor unit to determine whether there is a touch and determine the touch Location.

In a specific implementation, when the photoresistor unit 142 receives the light reflected by the finger when touched, the resistance of the photoresistor unit changes, so that the potential of the second end of the photoresistor unit changes light.

In actual operation, the photoresistor unit 142 may include any device that receives light and changes its resistance, and the photoresistor unit 142 may include a photoresistor.

In actual operation, the control switch 141 may be a control transistor, the control terminal is the gate, the first terminal is the first pole, the second terminal and the second pole, or any other A switching device that is turned on or off by a control signal.

In actual operation, the first fixed resistance unit 11 may include a fixed resistance, which is a resistance with a fixed resistance value, and the first fixed resistance unit 11 may also include a plurality of fixed resistances. The structure of the first fixed resistance unit is not limited;

The second fixed resistance unit 12 may include a fixed resistance, which is a resistance with a fixed resistance value, and the second fixed resistance unit 12 may also include a plurality of fixed resistances. The structure of the unit is not limited;

The third fixed resistor unit 13 may include a fixed resistor, which is a resistor with a fixed resistance value, and the third fixed resistor unit 13 may also include a plurality of fixed resistors. The structure of the unit is not limited.

In actual operation, the touch scan lines may also be gate lines, that is, the gate lines are multiplexed into touch scan lines during the touch time period.

Preferably, as shown in FIG. 2 , the touch control unit according to the embodiment of the present invention further includes an electrostrictive unit 15; the electrostrictive unit 15 includes:

the gate and the first pole of the photosensitive transistor Tps are connected to the second end of the photoresistor unit 142;

storage capacitor C, the first end is connected to the second pole of the phototransistor Tps, and the second end is connected to the low-level output end that outputs the low-level VSS;

In the electrostrictive device 151 , the first end is connected to the first end of the storage capacitor C, and the second end is connected to the second end of the storage capacitor C.

In the preferred embodiment of the touch control unit shown in FIG. 2 of the present invention, an electrostrictive unit 15 including a phototransistor Tps, a storage capacitor C and an electrostrictive device 151 is also used, wherein the phototransistor Tps is turned on when receiving light. , thereby charging the storage capacitor C, changing the voltage across the electrostrictive device 151 , so as to deform the electrostrictive device 151 , thereby making the touch more realistic.

The electrostrictive device 151 is made of an electrostrictive material. When the voltage across the electrostrictive device 151 changes, the electrostrictive device 151 also deforms accordingly.

As shown in FIG. 3 , the second end of the photoresistor unit 142 is connected to the read node RX; that is, the second end of the photoresistor unit 142 is connected to the touch read line TRL through the read node RX;

In a preferred case, between the read node RX and the touch read line TRL further includes:

The differential amplifier 30 has a non-inverting input terminal connected to the read node RX, an inverting input terminal connected to the reference voltage output terminal REF, and an output terminal connected to the touch read line TRL.

The preferred embodiment of the touch control unit shown in FIG. 3 of the present invention adopts a differential amplifier 30 , through which the difference in voltage caused by the reflected light caused by touch can be amplified, thereby further enhancing the touch precision.

The touch module according to the embodiment of the present invention includes M rows of touch scan lines and N columns of touch read lines that intersect horizontally and vertically, and further includes the touch scan lines and the touch read lines formed by the touch scan lines and the touch read lines. Limited multi-row and multi-column touch sub-units; N and M are both positive integers;

The touch control sub-unit in the mth row and the nth column includes a light sensing control module in the mth row and the nth column; m is a positive integer less than or equal to M, and n is a positive integer less than or equal to N;

The light sensing control module of the mth row and the nth column includes:

The mth row and the nth column control the switch, the control terminal is connected to the touch scan line of the mth row, and the first terminal is connected to the high-level output terminal; and,

The first end of the photosensitive resistor unit in the mth row and the nth column is connected to the second end of the control switch in the mth row and the nth column, and the second end is in contact with the second end of the third fixed resistor and the nth column respectively. Control reading line connection;

The touch module further includes N column sharing units;

The nth column common unit includes:

the first fixed resistance unit, the first end is connected to the high-level output end, and the second end is connected to the reference voltage output end;

The first end of the second fixed resistance unit is connected to the second end of the first fixed resistance unit, and the second end is connected to the low-level output end;

In the third fixed resistance unit, the first terminal is connected to the low-level output terminal, and the second terminal is respectively connected to the second terminals of all the photoresistor units located in the nth column.

In the touch module according to the embodiment of the present invention, each column has a column sharing unit, and the column sharing unit includes the first fixed resistance unit, the second fixed resistance unit and the third fixed resistance Each of the touch sub-units includes a light-sensing control module, and the light-sensing control module and the column sharing unit on the column where it is located together form a touch control unit.

Preferably, the touch control sub-unit in the m-th row and the n-th column further includes an electrostrictive unit in the m-th row and the n-th column;

The electrostrictive unit in the m-th row and the n-th column includes:

The phototransistor in the mth row and the nth column has a gate electrode and a first electrode connected to the second end of the photosensitive resistor unit in the mth row and the nth column;

The storage capacitor of the mth row and the nth column has a first terminal connected to the second pole of the phototransistor of the mth row and the nth column, and the second terminal is connected to the low-level output terminal;

The electrostrictive device in the mth row and the nth column has a first terminal connected to the first terminal of the mth row and nth column storage capacitor, and a second terminal connected to the second terminal of the mth row and nth column storage capacitor. .

The touch control sub-unit of the mth row and the nth column also adopts the mth row and nth column electric device including the mth row and the nth column phototransistor, the mth row and the nth column storage capacitor and the mth row and nth column electrostrictive device. The electrostrictive unit, in which the phototransistor of the mth row and the nth column turns on when receiving light, thereby charging the storage capacitor of the mth row and the nth column, and changing the voltage across the electrostrictive device of the mth row and the nth column, so that the The electrostrictive devices in the m-th row and n-th column are deformed, thereby making the touch more realistic.

Preferably, the n-th column sharing unit further includes a differential amplifier;

In the differential amplifier, the non-inverting input terminal is connected to the second terminals of all photoresistor units located in the nth column, the inverting input terminal is connected to the reference voltage output terminal, and the output terminal is connected to the nth column touch reading line connection;

The differential amplifier can amplify the voltage difference caused by the reflected light generated by the touch, thereby further enhancing the touch precision.

During actual operation, the touch module described in the implementation of the present invention further includes a touch scanning unit and a touch reading unit;

The touch scanning units are respectively connected with the M rows of touch scanning lines, and are used for sequentially sending corresponding touch scanning signals to the M rows of touch scanning lines in the touch stage;

The touch reading units are respectively connected to the N columns of touch reading lines, and are used for determining whether there is a touch and determining a touch position by reading the voltage on each of the touch reading lines.

During specific implementation, the touch module according to the embodiment of the present invention further includes a touch scanning unit and a touch reading unit to perform scanning and touch sensing.

In actual operation, the touch scan lines may also be gate lines, that is, the gate lines are multiplexed into touch scan lines during the touch time period, and the low-level output terminal may be a ground terminal.

The touch module of the present invention will be described below through a specific embodiment.

In FIG. 4 , only part of the touch sub-units in the first column and the shared unit in the first column included in the touch module according to the present invention are drawn as an example.

As shown in FIG. 4 , a specific embodiment of the touch module of the present invention includes a first row of gate lines Gate1 , a second row of gate lines Gate2 , a third row of gate lines Gate3 , and a third row of gate lines Gate3 , which are sequentially arranged from top to bottom Four rows of gate lines Gate4 (in actual operation, this specific embodiment of the touch module of the present invention includes more rows of gate lines, which are not shown in FIG. 4 ), and the first column of touch reading Line TRL1 (in actual operation, this specific embodiment of the touch control module of the present invention includes more rows of touch read lines, which are not shown in FIG. 4 );

As shown in FIG. 4 , the specific embodiment of the touch module of the present invention further includes a touch sub-unit 411 in the first row and column, a touch sub-unit 421 in the second row and the first column, and a touch sub-unit 421 in the third row and the first column. A column of touch sub-units 431, a fourth row of the first column of touch sub-units 441 and a first column of shared units 401;

In the specific embodiment shown in FIG. 4 , each of the photoresistor units includes a photoresistor;

The first column common unit 401 includes:

The first fixed resistor R1, the first end is connected to the high-level output end that outputs the high-level VDD, and the second end is connected to the reference voltage output end REF;

The second fixed resistor R2, the first end is connected to the second end of the first fixed resistor R1, and the second end is connected to the ground terminal GND;

The third fixed resistor R3, the first terminal is connected to the ground terminal GND, and the second terminal is respectively connected to the second terminals of all the photoresistors located in the first column;

The second ends of all photoresistors in the first column are connected to the first read node RX1;

The touch sub-unit 411 in the first row and first column includes a first row and first column photosensitive control module 4111 and a first row and first column electrostrictive unit 4112;

The light sensing control module 4111 in the first row and first column includes:

The first row and the first column control the switching transistor T11, the gate is connected to the gate line Gate1 of the first row, and the first pole is connected to the high-level output terminal that outputs a high-level VDD; and,

The first row and the first column of the photoresistor RL11, the first terminal is connected to the second pole of the control switch transistor T11 of the first row and the first column, and the second terminal is respectively connected to the second terminal and the second terminal of the third fixed resistor R3. A column of touch read lines TRL1 are connected;

The electrostrictive units 4112 in the first row and first column include:

The gate and drain of the phototransistor Tps11 in the first row and the first column are connected to the second end of the photoresistor RL11 in the first row and the first column;

the first row and the first column of the storage capacitor C11, the first end is connected to the source of the phototransistor Tps11 in the first row and the first column, and the second end is connected to the ground terminal GND;

The electrostrictive device ES11 of the first row and the first column, the first end is connected to the first end of the storage capacitor C11 of the first row and the first column, and the second end is connected to the first end of the storage capacitor C11 of the first row and the first column. Two-terminal connection;

The touch sub-unit 421 in the second row and the first column includes a photosensitive control module 4211 in the second row and the first column and an electrostrictive unit 4212 in the second row and the first column;

The light sensing control module in the second row and the first column includes:

The second row and the first column control the switching transistor T21, the gate is connected to the gate line Gate2 of the second row, and the first pole is connected to the high-level output terminal that outputs a high-level VDD; and,

The first end of the photoresistor RL21 in the second row and the first column is connected to the second pole of the control switch transistor T21 in the second row and the first column, and the second end is respectively connected with the second end and the second end of the third fixed resistor R3. A column of touch read lines TRL1 are connected;

The electrostrictive units 4212 in the second row and the first column include:

The gate and drain of the phototransistor Tps21 in the second row and the first column are connected to the second end of the photoresistor RL21 in the second row and the first column;

The storage capacitor C21 in the second row and the first column has a first terminal connected to the source of the phototransistor Tps21 in the second row and first column, and a second terminal connected to the ground terminal GND;

The electrostrictive device ES21 in the second row and the first column, the first terminal is connected to the first terminal of the storage capacitor C21 in the second row and the first column, and the second terminal is connected to the first terminal of the storage capacitor C21 in the second row and the first column. Two-terminal connection;

The touch sub-unit 431 in the third row and the first column includes a photosensitive control module 4311 in the third row and the first column and an electrostrictive unit 4312 in the third row and the first column;

The light sensing control module 4311 in the third row and the first column includes:

The third row and the first column control the switching transistor T31, the gate is connected to the gate line Gate3 of the third row, and the first pole is connected to the high-level output terminal that outputs a high-level VDD; and,

The first end of the photoresistor RL31 in the third row and the first column is connected to the second pole of the control switch transistor T31 in the third row and the first column, and the second end is respectively connected with the second end of the third fixed resistor R3 and the second end of the third fixed resistor R3. A column of touch read lines TRL1 are connected;

The electrostrictive units 4312 in the third row and the first column include:

The gate and drain of the phototransistor Tps31 in the first row and the first column are connected to the second end of the photoresistor RL31 in the third row and the first column;

The storage capacitor C31 in the third row and the first column, the first terminal is connected to the source of the phototransistor Tps31 in the third row and the first column, and the second terminal is connected to the ground terminal GND;

The first end of the electrostrictive device ES31 in the third row and the first column is connected to the first end of the storage capacitor C31 in the third row and the first column, and the second end is connected with the first end of the storage capacitor C31 in the third row and the first column. Two-terminal connection;

The touch control sub-unit 441 in the fourth row and the first column includes a photosensitive control module 4411 in the fourth row and the first column and an electrostrictive unit 4412 in the fourth row and the first column;

The light sensing control module in the fourth row and the first column includes:

The fourth row and the first column control the switching transistor T41, the gate is connected to the gate line Gate4 of the fourth row, and the first pole is connected to the high-level output terminal that outputs the high-level VDD; and,

The first end of the photoresistor RL41 in the fourth row and the first column is connected to the second pole of the control switch transistor T41 in the fourth row and the first column, and the second end is respectively connected with the second end of the third fixed resistor R3 and the second end of the third fixed resistor R3. A column of touch read lines TRL1 are connected;

The electrostrictive units 4412 in the fourth row and the first column include:

The gate and drain of the phototransistor Tps41 in the fourth row and the first column are connected to the second end of the photoresistor RL41 in the fourth row and the first column;

The storage capacitor C41 in the fourth row and the first column has a first terminal connected to the source of the phototransistor Tps41 in the fourth row and first column, and a second terminal connected to the ground terminal GND;

The electrostrictive device ES41 in the fourth row and the first column, the first end is connected to the first end of the storage capacitor C41 in the fourth row and the first column, and the second end is connected with the first end of the storage capacitor C41 in the fourth row and the first column. Two-terminal connection;

The second end of the third fixed resistor R3 is respectively connected with the second end of the photoresistor RL11 in the first row and the first column, the second end of the photoresistor RL21 in the second row and the first column, and the second end of the photoresistor RL31 in the third row and the first column. The two ends are connected to the second end of the photoresistor RL41 in the fourth row and the first column;

The first column sharing unit further includes a differential amplifier 40;

In the differential amplifier 40, the non-inverting input terminal is connected to the second terminals of all the photoresistors in the first column (that is, connected to the first read node RX1), the inverting input terminal is connected to the reference voltage output terminal REF, and the output is The terminal is connected to the touch read line TRL1 of the first column.

When the specific embodiment of the touch module of the present invention as shown in FIG. 4 is in operation, a bridge differential amplifier circuit composed of R1, R2, R3 and corresponding photoresistors is set in each row, and the gate lines are scanned from top to bottom. After a row is gated, it is judged whether there is a touch according to the output level output from the differential amplifier 40 to TRL1, and if the output level is a high level, it is judged that there is a touch;

Vref is equal to VDD×R1/(R1+R2), Vref is the reference voltage output by REF;

Specifically, for example, when Gate2 outputs a high level, T21 is turned on, so that the right side of the bridge wall is connected. If there is no touch, that is, RL21 does not receive reflected light, and the resistance of RL21 remains R01, that is, R1/R2=R01/R3 , at this time VRx1=VDD×R01/(R01+R3), then Vref=VRx1, VRx1 is the potential of RX1, the differential amplifier 40 has no output, that is, the output level Vout of the differential amplifier 40 is approximately 0 at this time; The partial pressure generated by R3 and RL21 is small and cannot reach the threshold voltage of Tps21. In addition, Tps21 does not receive light, so Tps21 is turned off, and ES21 does not operate at this time;

If the light is received through RL21 and Tps21, that is, there is touch, so that the impedance of RL21 is reduced to R02, R02/R3>R1/R2, that is, VRx1>Vref, VRx1=VDD×R02/(R02+R3), after differential After differential amplification by the amplifier 40, the output level Vout output to TRL1 increases sharply. At this time, Vout is equal to K×ΔV, and ΔV is the difference between VRx1 and Vref at this time. Combined with gate line scanning, the specific touch position can be obtained. At this time, R3 The partial pressure generated by RL21 and RL21 is relatively large, reaching the threshold voltage of Tps21, and the influence of light makes Tps21 open, charging ES21 to deform it, thereby enhancing touch feedback.

FIG. 5 is a schematic diagram of the voltage of the gate driving signal output by Gate1, the gate driving signal output by Gate2, VRx1 and Vout.

In the embodiment shown in Figure 4, the impedance in the screen can be controlled by controlling the length of the wire, the folded wire can be made into a resistor, R1, R2 and R3 can be completed by fan-out routing in the screen, and can be adjusted in the design stage The resistance value of R1, the resistance value of R2 and the resistance value of R3 can be adapted to different photosensitive materials. Compared with the traditional design, the material selection range becomes larger, so that the touch power consumption is controlled.

In actual operation, the strain generated by the dielectric under the action of the external electric field is called electrostriction, which is proportional to the square of the field strength. Commonly used electrostrictive materials include piezoelectric ceramics, piezoelectric semiconductors, piezoelectric polymers, etc. .

When the voltage V across the electrostrictive device ES is 0V, the degree of stretching of the electrostrictive device ES is shown in FIG. 6A . When the voltage V across the ES is the first voltage V1, the stretching degree of the electrostrictive device ES is as follows shown in Figure 6B. In FIG. 6A and FIG. 6B , the reference number C is the storage capacitor.

The in-cell touch screen according to the embodiment of the present invention includes the above-mentioned touch module.

Specifically, the in-cell touch screen of the present invention further includes an array substrate and a plurality of rows of grid lines disposed on the array substrate;

The gate lines are multiplexed as touch scan lines included in the touch module.

The display device according to the embodiment of the present invention includes the above-mentioned in-cell touch screen. The above are the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made. It should be regarded as the protection scope of the present invention.

Claims (10)

1. A touch unit is respectively connected with a touch scanning line and a touch reading line and is characterized by comprising an electric bridge, wherein a first bridge arm, a second bridge arm and a third bridge arm of the electric bridge are respectively provided with a first fixed resistance unit, a second fixed resistance unit and a third fixed resistance unit, and the other bridge arm of the electric bridge is provided with a light sensation control module;

the first end of the first fixed resistance unit is connected with the high-level output end, the second end of the first fixed resistance unit is respectively connected with the reference voltage output end and the first end of the second fixed resistance unit, and the second end of the second fixed resistance unit is respectively connected with the first end of the third fixed resistance unit and the low-level output end;

the light sensation control module comprises:

the control end of the control switch is connected with the touch scanning line, and the first end of the control switch is connected with the high-level output end; and the number of the first and second groups,

and a first end of the photosensitive resistance unit is connected with a second end of the control switch, and a second end of the photosensitive resistance unit is respectively connected with a second end of the third fixed resistor and the touch reading line.

2. The touch-sensitive unit of claim 1, further comprising an electrostrictive unit; the electrostrictive cell includes:

a phototransistor, the gate and the first pole of which are connected to the second terminal of the photoresistor unit;

the first end of the storage capacitor is connected with the second pole of the photosensitive transistor, and the second end of the storage capacitor is connected with the low-level output end;

and the first end of the electrostrictive device is connected with the first end of the storage capacitor, and the second end of the electrostrictive device is connected with the second end of the storage capacitor.

3. The touch-sensing unit of claim 1 or 2, wherein the second end of the photo-sensing resistor unit is connected to a reading node;

between the read node and the touch read line, further comprising:

and a positive phase input end of the differential amplifier is connected with the reading node, a negative phase input end of the differential amplifier is connected with the reference voltage output end, and an output end of the differential amplifier is connected with the touch reading line.

4. A touch module comprises M rows of touch scanning lines and N rows of touch reading lines which are crossed horizontally and longitudinally, and is characterized by further comprising a plurality of rows and columns of touch subunits defined by the touch scanning lines and the touch reading lines; n and M are both positive integers;

the mth row and nth row touch control subunits comprise mth row and nth row light sensation control modules; m is a positive integer less than or equal to M, N is a positive integer less than or equal to N;

the light sensing control module in the mth row and the nth column comprises:

the control end of the nth row control switch is connected with the mth row touch control scanning line, and the first end of the nth row control switch is connected with the high-level output end; and the number of the first and second groups,

a first end of the m-th row and n-th column of photosensitive resistance units is connected with a second end of the m-th row and n-th column of control switches, and a second end of the m-th row and n-th column of photosensitive resistance units is respectively connected with a second end of a third fixed resistor and an n-th column of touch reading lines;

the touch module also comprises N row sharing units;

the nth column of shared cells includes:

the first fixed resistor unit is connected with the high-level output end at the first end and connected with the reference voltage output end at the second end;

the first end of the second fixed resistance unit is connected with the second end of the first fixed resistance unit, and the second end of the second fixed resistance unit is connected with the low-level output end;

and the first end of the third fixed resistance unit is connected with the low-level output end, and the second end of the third fixed resistance unit is respectively connected with the second ends of all the photoresistor units positioned in the nth column.

5. The touch module of claim 4, wherein the mth column and nth row of touch sub-units further comprise an mth column and nth row of electrostrictive units;

the m-th row and n-th column electrostrictive cells include:

the gate and the first pole of the mth row and nth column photosensitive transistor are connected with the second end of the mth row and nth column photosensitive resistance unit;

the first end of the storage capacitor is connected with the second pole of the phototransistor in the mth row and the nth column, and the second end of the storage capacitor is connected with the low-level output end;

and the first end of the m-th row and n-th column of the electrostrictive device is connected with the first end of the m-th row and n-th column of the storage capacitor, and the second end of the m-th row and n-th column of the storage capacitor is connected with the second end of the m-th row and n-th column of the storage capacitor.

6. The touch module of claim 4 or 5, wherein the nth row of common cells further comprises a differential amplifier;

and the positive phase input end of the differential amplifier is connected with the second ends of all the photoresistor units positioned in the nth row, the negative phase input end of the differential amplifier is connected with the reference voltage output end, and the output end of the differential amplifier is connected with the touch reading line of the nth row.

7. The touch module of claim 6, further comprising a touch scanning unit and a touch reading unit;

the touch scanning units are respectively connected with the M rows of touch scanning lines and used for sequentially sending corresponding touch scanning signals to the M rows of touch scanning lines in a touch stage;

the touch reading units are respectively connected with the N rows of touch reading lines and used for judging whether touch exists or not and determining a touch position by reading the voltage on each touch reading line.

8. An in-cell touch panel comprising the touch module of any one of claims 4 to 7.

9. The in-cell touch screen of claim 8, further comprising an array substrate and a plurality of rows of gate lines disposed on the array substrate;

the grid lines are multiplexed into touch scanning lines included by the touch module.

10. A display device comprising the in-cell touch panel according to claim 8 or 9.

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