CN106354345B - Touch unit, touch module, embedded touch screen and display device - Google Patents
Touch unit, touch module, embedded touch screen and display device Download PDFInfo
- Publication number
- CN106354345B CN106354345B CN201611013128.7A CN201611013128A CN106354345B CN 106354345 B CN106354345 B CN 106354345B CN 201611013128 A CN201611013128 A CN 201611013128A CN 106354345 B CN106354345 B CN 106354345B
- Authority
- CN
- China
- Prior art keywords
- touch
- row
- column
- unit
- resistance unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 239000003990 capacitor Substances 0.000 claims description 43
- 230000035807 sensation Effects 0.000 claims description 10
- 239000000758 substrate Substances 0.000 claims description 6
- 238000005286 illumination Methods 0.000 abstract description 6
- 101710097146 Uncharacterized protein HKLF1 Proteins 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 3
- 101100195396 Human cytomegalovirus (strain Merlin) RL11 gene Proteins 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 102100036808 Carboxylesterase 3 Human genes 0.000 description 1
- 101000851624 Homo sapiens Carboxylesterase 3 Proteins 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Position Input By Displaying (AREA)
- Electronic Switches (AREA)
Abstract
The invention provides a touch unit, a touch module, an embedded touch screen and a display device. The touch control device comprises a touch control unit bridge, wherein a first bridge arm, a second bridge arm and a third bridge arm of the 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 bridge is provided with a light sensing control module; the light sense control module includes: 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 first end of the photosensitive resistance unit is connected with the second end of the control switch, and the second end of the photosensitive resistance unit is respectively connected with the second end of the third fixed resistor and the touch reading line. The invention solves the problem that the prior art can not accurately and quickly convert illumination into an electric signal to be transmitted to a touch reading line, so that touch can not be accurately detected and a touch position can not be judged.
Description
Technical Field
The invention relates to the technical field of touch control, in particular to a touch control unit, a touch control module, an embedded touch control screen and a display device.
Background
With the rapid development of display technology, touch screens have gradually spread throughout the lives of people. Currently, classified by principle, touch screens include: resistive sensing touch screens, capacitive sensing touch screens, optical sensing touch screens, and the like. The optical sensing touch screen is used as the next generation touch sensing technology, the size of the screen is not limited, the service life of a manufactured product is long, the manufactured product is relatively stable, and the problems of signal interference and signal delay can be solved. However, the existing optical sensing touch screen cannot accurately and quickly convert illumination into an electrical signal to be transmitted to the touch reading line, so that touch and touch position cannot be accurately detected and judged.
Disclosure of Invention
The invention mainly aims to provide a touch unit, a touch module, an embedded touch screen and a display device, and solves the problem that in the prior art, illumination cannot be accurately and quickly converted into an electric signal to be transmitted to a touch reading line, so that touch cannot be accurately detected and a touch position cannot be judged.
In order to achieve the above object, the present invention provides a touch unit, which is respectively connected to a touch scanning line and a touch reading line, wherein the touch unit includes an electrical bridge, a first fixed resistance unit, a second fixed resistance unit, and a third fixed resistance unit are respectively disposed on a first bridge arm, a second bridge arm, and a third bridge arm of the electrical bridge, and a light sensing control module is disposed on the other bridge arm of the electrical bridge;
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.
In implementation, the touch unit of the invention further comprises 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.
In implementation, the second end of the photoresistor unit is connected with 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.
The invention also provides a touch module, which comprises M rows of touch scanning lines and N rows of touch reading lines which are crossed horizontally and longitudinally, and also comprises a plurality of rows and a plurality of columns of touch subunits which are limited 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 the third fixed resistance 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.
In implementation, the mth row and nth column touch sub-units further comprise mth row and nth column 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.
In an implementation, the nth column of shared units 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.
In implementation, the touch module further comprises 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.
The invention also provides an embedded touch screen which comprises the touch module.
In implementation, the embedded touch screen further comprises an array substrate and a plurality of rows of grid lines arranged on the array substrate;
the grid lines are multiplexed into touch scanning lines included by the touch module.
The invention also provides a display device which comprises the embedded touch screen.
Compared with the prior art, the touch unit, the touch module, the embedded touch screen and the display device comprise the electric bridge, the light sensation control module is arranged on one bridge arm of the electric bridge and comprises the control switch and the photosensitive resistance unit, and the resistance of the photosensitive resistance unit is changed by receiving light reflected by fingers when the photosensitive resistance unit is touched, so that the potential of the second end of the photosensitive resistance unit is changed, and whether touch exists or not and the touch position can be accurately and quickly judged by detecting the potential of the second end of the photosensitive resistance unit.
Drawings
Fig. 1 is a structural diagram of a touch unit according to an embodiment of the invention;
FIG. 2 is a circuit diagram of a touch unit according to another embodiment of the present invention;
FIG. 3 is a schematic diagram of a differential amplifier included in a preferred embodiment of a touch unit according to the present invention;
FIG. 4 is a circuit diagram of a touch module according to an embodiment of the invention;
fig. 5 is a voltage diagram of the Gate driving signal output by the Gate1, the Gate driving signal output by the Gate2, the VRx1 and Vout when the touch module shown in fig. 4 operates according to one aspect of the invention;
FIG. 6A is a schematic diagram of the expansion and contraction of the electrostrictive device ES when no voltage is applied across the electrostrictive device ES;
fig. 6B is a schematic view showing the expansion and contraction of the electrostrictive device ES when V1 is applied to both ends thereof.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, 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 respectively connected to the touch scan line SL and the touch read line TRL;
the touch control unit comprises an electric bridge, 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 11, a second fixed resistance unit 12 and a third fixed resistance unit 13, and the other bridge arm of the electric bridge is provided with a light sensation control module 14;
a first end of the first fixed resistance unit 11 is connected to a high level output end outputting a high level VDD, a second end of the first fixed resistance unit 11 is connected to a reference voltage output end REF and a first end of the second fixed resistance unit 12, respectively, and a second end of the second fixed resistance unit 12 is connected to a first end of the third fixed resistance unit 13 and a low level output end outputting a low level VSS, respectively;
the light sensation control module 14 includes:
a control switch 141 having a control terminal connected to the touch scan line SL and a first terminal connected to a high level output terminal outputting a high level VDD; and the number of the first and second groups,
a first end of the photo-resistor unit 142 is connected to the second end of the control switch 141, and a second end of the photo-resistor unit is connected to the second end of the third fixed resistor unit 13 and the touch reading line TRL, respectively.
The touch unit comprises a bridge, a light sensing control module is arranged on one bridge arm of the bridge and comprises a control switch and a photoresistor unit, and the photoresistor unit receives light reflected by a finger when in touch so that the resistance of the photoresistor unit is changed, so that the potential of the second end of the photoresistor unit is changed, and whether touch exists or not and the touch position can be judged accurately and quickly by detecting the potential of the second end of the photoresistor unit.
In specific implementation, when the light reflected by the finger when touched is received by the photo-resistor unit 142, the resistance of the photo-resistor unit changes, so that the potential of the second end of the photo-resistor unit changes in light emission.
In practical operation, the light-sensitive resistor unit 142 may include any device that changes resistance when receiving light, and the light-sensitive resistor unit 142 may include a light-sensitive resistor.
In practical operation, the control switch 141 may be a control transistor, the control terminal is a gate, the first terminal is a first pole, and the second terminal and the second pole are also any other switching devices that can be controlled to be turned on or off by a control signal.
In practical 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, where 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, where the structure of the second fixed resistance unit is not limited;
the third fixed resistance unit 13 may include a fixed resistance, which is a resistance with a fixed resistance value, and the third fixed resistance unit 13 may also include a plurality of fixed resistances, where the structure of the third fixed resistance unit is not limited herein.
In actual operation, the touch scan lines may also be gate lines, that is, the gate lines are reused as the touch scan lines in a touch time period.
Preferably, as shown in fig. 2, the touch unit according to the embodiment of the present invention further includes an electrostrictive unit 15; the electrostrictive cell 15 includes:
a phototransistor Tps with a gate and a first pole connected to a second terminal of the photoresistor unit 142;
a storage capacitor C, a first end of which is connected with a second pole of the phototransistor Tps, and a second end of which is connected with a low level output end outputting a low level VSS;
and an electrostrictive device 151 having a first terminal connected to the first terminal of the storage capacitor C and a second terminal connected to the second terminal of the storage capacitor C.
In the preferred embodiment of the touch 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 further employed, wherein the phototransistor Tps is turned on when receiving light, so as to charge the storage capacitor C, and change the voltage at both ends of the electrostrictive device 151, so that the electrostrictive device 151 deforms, thereby making the touch more realistic.
The electrostrictive device 151 is made of an electrostrictive material, and when the voltage across the electrostrictive device 151 changes, the electrostrictive device 151 deforms accordingly.
As shown in fig. 3, a second terminal of the photo-resistor unit 142 is connected to a read node RX; that is, the second end of the photo-resistor unit 142 is connected to the touch reading line TRL through a reading node RX;
preferably, the method further includes, between the read node RX and the touch read line TRL:
a positive phase input end of the differential amplifier 30 is connected to the read node RX, a negative phase input end thereof is connected to the reference voltage output end REF, and an output end thereof is connected to the touch read line TRL.
The preferred embodiment of the touch unit shown in fig. 3 of the present invention employs a differential amplifier 30, and the differential amplifier 30 can amplify the voltage difference caused by the reflected light due to touch, thereby further enhancing the touch accuracy.
The touch module comprises M rows of touch scanning lines and N rows of touch reading lines which are crossed horizontally and longitudinally, and a plurality of rows and columns of touch subunits which are limited 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 the third fixed resistance 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.
In the touch module according to the embodiment of the present invention, each row has a row sharing unit, the row sharing unit includes the first fixed resistor unit, the second fixed resistor unit and the third fixed resistor unit, and each touch sub-unit includes a light sensing control module, and the light sensing control module and the row sharing unit on the row on which the light sensing control module is located form a touch unit together.
Preferably, the mth row and nth column touch sub-units further include an mth row and nth column electrostrictive unit;
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.
The mth row and nth column touch subunit further adopts an mth row and nth column electrostrictive unit comprising an mth row and nth column of photosensitive transistors, an mth row and nth column of storage capacitors and an mth row and nth column of electrostrictive devices, wherein the mth row and nth column of photosensitive transistors are turned on when receiving illumination, so that the mth row and nth column of storage capacitors are charged, the voltage at two ends of the mth row and nth column of electrostrictive devices is changed, and the mth row and nth column of electrostrictive devices are deformed, so that touch is more real.
Preferably, the nth column of shared units further includes a differential amplifier;
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;
the voltage difference caused by the reflected illumination generated by touch can be amplified through the differential amplifier, and the touch precision is further enhanced.
In practical operation, the touch module implemented by the invention further comprises 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.
In a specific implementation, the touch module according to the embodiment of the invention further includes a touch scanning unit and a touch reading unit for performing scanning and touch sensing.
In actual operation, the touch scan line may also be a gate line, that is, the gate line is reused as the touch scan line in a touch time period, and the low level output terminal may be a ground terminal.
The touch module according to the present invention is described below with reference to an embodiment.
Fig. 4 illustrates only a portion of the touch sub-units in the first row and the common units in the first row included in the touch module according to the present invention, as an example.
As shown in fig. 4, an embodiment of the touch module according to the 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 fourth row of Gate lines Gate4 (in actual operation, the embodiment of the touch module according to the invention includes more rows of Gate lines, which are not shown in fig. 4), and a first column of touch readout lines TRL1 (in actual operation, the embodiment of the touch module according to the invention includes more columns of touch readout lines, which are not shown in fig. 4);
as shown in fig. 4, the embodiment of the touch module of the present invention further includes a first row and first column touch sub-unit 411, a second row and first column touch sub-unit 421, a third row and first column touch sub-unit 431, a fourth row and first column touch sub-unit 441, and a first column sharing unit 401;
in the embodiment shown in fig. 4, each of the photo-resistor units includes a photo-resistor;
the first column sharing unit 401 includes:
a first fixed resistor R1, a first terminal of which is connected to a high level output terminal outputting a high level VDD, and a second terminal of which is connected to a reference voltage output terminal REF;
a second fixed resistor R2, a first end of which is connected to the second end of the first fixed resistor R1, and a second end of which is connected to the ground GND;
a third fixed resistor R3, a first end of which is connected to the ground GND and a second end of which is connected to the second ends of all the photo resistors in the first column;
the second ends of all the photo-resistors located in the first column are connected to the first read node RX 1;
the first row and first column touch subunit 411 includes a first row and first column light-sensing control module 4111 and a first row and first column electrostrictive unit 4112;
the first row and first column light sense control block 4111 comprises:
a first row and first column control switch transistor T11, a Gate of which is connected to a first row Gate1, and a first pole of which is connected to a high level output terminal outputting a high level VDD; and the number of the first and second groups,
a first row and first column photosensitive resistor RL11, a first end of which is connected to the second pole of the first row and first column control switch transistor T11, and a second end of which is connected to the second end of the third fixed resistor R3 and the first column touch read line TRL1, respectively;
the first row and first column electrostrictive cell 4112 includes:
a first row and first column phototransistor Tps11 with a gate and drain connected to a second terminal of the first row and first column photoresistor RL 11;
a first row and first column storage capacitor C11, a first terminal of which is connected to the source of the first row and first column phototransistor Tps11, and a second terminal of which is connected to a ground terminal GND;
a first row and first column electrostrictive device ES11 having a first terminal connected to a first terminal of the first row and first column storage capacitor C11 and a second terminal connected to a second terminal of the first row and first column storage capacitor C11;
the second row and first column touch sub-unit 421 includes a second row and first column light-sensing control module 4211 and a second row and first column electrostrictive unit 4212;
the second row and first column light sense control module comprises:
a Gate of the second row and first column control switch transistor T21 is connected with a second row Gate line Gate2, and a first pole of the second row and first column control switch transistor T21 is connected with a high level output end for outputting a high level VDD; and the number of the first and second groups,
a second row and first column photo-resistor RL21, a first end of which is connected to the second pole of the second row and first column control switch transistor T21, and a second end of which is connected to the second end of the third fixed resistor R3 and the first column touch reading line TRL1, respectively;
the second row and first column electrostrictive cells 4212 include:
a second row and first column photo transistor Tps21, a gate and a drain connected to a second end of the second row and first column photo resistor RL 21;
a second row and first column storage capacitor C21, a first terminal of which is connected with the source of the second row and first column phototransistor Tps21, and a second terminal of which is connected with a ground terminal GND;
a second row and first column electrostrictive device ES21, a first terminal of which is connected to a first terminal of the second row and first column storage capacitor C21, and a second terminal of which is connected to a second terminal of the second row and first column storage capacitor C21;
the third row and first column touch sub-unit 431 includes a third row and first column light sense control module 4311 and a third row and first column electrostrictive unit 4312;
the third row and first column photo sense control module 4311 includes:
a third row and first column control switch transistor T31, a Gate of which is connected with a third row grid line Gate3, and a first pole of which is connected with a high-level output end for outputting a high-level VDD; and the number of the first and second groups,
a third row and first column photo-resistor RL31, a first terminal of which is connected to the second pole of the third row and first column control switch transistor T31, and a second terminal of which is connected to the second terminal of the third fixed resistor R3 and the first column touch read line TRL1, respectively;
the third row and first column electrostrictive cell 4312 includes:
a first row and first column phototransistor Tps31 with a gate and a drain connected to a second terminal of the third row and first column photoresistor RL 31;
a third row and first column storage capacitor C31, a first terminal of which is connected with the source of the third row and first column phototransistor Tps31, and a second terminal of which is connected with a ground terminal GND;
a third row and first column electrostrictive device ES31 having a first terminal connected to a first terminal of the third row and first column storage capacitor C31 and a second terminal connected to a second terminal of the third row and first column storage capacitor C31;
the fourth row and first column touch subunit 441 comprises a fourth row and first column light-sensing control module 4411 and a fourth row and first column electrostrictive unit 4412;
the fourth row and the first column of light sensation control modules comprise:
a fourth row and first column control switch transistor T41, the Gate of which is connected with a fourth row grid line Gate4, and the first pole of which is connected with a high-level output end for outputting a high-level VDD; and the number of the first and second groups,
a fourth row and first column photo-resistor RL41, a first terminal of which is connected to the second pole of the fourth row and first column control switch transistor T41, and a second terminal of which is connected to the second terminal of the third fixed resistor R3 and the first column touch reading line TRL1, respectively;
the fourth row and first column electrostrictive cell 4412 includes:
a fourth row first column phototransistor Tps41, a gate and a drain connected to a second terminal of the fourth row first column photoresistor RL 41;
a fourth row first column storage capacitor C41, a first terminal of which is connected with the source of the fourth row first column phototransistor Tps41, and a second terminal of which is connected with a ground terminal GND;
a fourth row first column electrostrictive device ES41 having a first terminal connected to a first terminal of the fourth row first column storage capacitor C41 and a second terminal connected to a second terminal of the fourth row first column storage capacitor C41;
a second end of the third fixed resistor R3 is connected to a second end of the first row and first column photo resistor RL11, a second end of the second row and first column photo resistor RL21, a second end of the third row and first column photo resistor RL31 and a second end of the fourth row and first column photo resistor RL41 respectively;
the first column common unit further includes a differential amplifier 40;
the non-inverting input terminal of the differential amplifier 40 is connected to the second terminals of all the photo-resistors in the first row (i.e., connected to the first readout node RX 1), the inverting input terminal thereof is connected to the reference voltage output terminal REF, and the output terminal thereof is connected to the first row touch readout line TRL 1.
When the embodiment of the touch module shown in fig. 4 of the present invention is in operation, each row is provided with a bridge differential amplifier circuit formed by R1, R2, R3 and corresponding photo resistors, the gate lines are scanned from top to bottom, and after one row is gated, whether a touch exists is determined according to the output level output from the differential amplifier 40 to the TRL1, and if the output level is high, it is determined that a touch exists;
vref is equal to VDD × R1/(R1+ R2), Vref is the reference voltage of REF output;
specifically, for example, when the Gate2 outputs a high level, the T21 is turned on so that the right side of the bridge wall is connected, and if there is no touch, that is, the RL21 does not receive reflected light, the resistance value of the RL21 is maintained at R01, that is, R1/R2 is R01/R3, and at this time, VRx1 is VDD × R01/(R01+ R3), Vref is VRx1, and VRx1 is the potential of RX1, and the differential amplifier 40 has no output, that is, the output level Vout of the differential amplifier 40 is approximately 0 at this time; at this time, the divided voltage generated by the R3 and the RL21 is small and cannot reach the threshold voltage of the Tps21, and in addition, the Tps21 does not receive illumination, the Tps21 is closed, and at this time, the ES21 does not act;
if RL21 and Tps21 receive light, that is, there is a touch, the impedance of RL21 is reduced to R02, R02/R3> R1/R2, that is, when VRx1 > Vref, VRx1 ═ VDD × R02/(R02+ R3), after differential amplification by a differential amplifier 40, the output level Vout output to TRL1 is sharply increased, when Vout is equal to K × Δ V, Δ V is the difference between VRx1 and Vref, a specific touch position can be obtained in combination with grid line scanning, when the divided voltage generated by R3 and RL21 is large, the threshold voltage of Tps21 is reached, and the influence of the light is added to turn on Tps21 to charge ES21 to deform the ES, thereby enhancing touch feedback.
Fig. 5 is a voltage diagram of the Gate drive signal output by the Gate1, the Gate drive signal output by the Gate2, VRx1, and Vout.
In the embodiment shown in fig. 4, the impedance in the screen can be controlled by controlling the length of the line, the folded line can be made into a resistor, R1, R2 and R3 can be completed in the screen through fan-out wiring, the resistance of R1, the resistance of R2 and the resistance of R3 can be regulated and controlled in the design stage to adapt to different photosensitive materials, compared with the conventional design, the material selection range is larger, and the touch power consumption is controlled.
In practical operation, the strain generated by the dielectric medium under the action of the external electric field and proportional to the square of the field strength is called electrostriction, and common electrostriction materials are piezoelectric ceramics, piezoelectric semiconductors, piezoelectric polymers and the like.
When the voltage V across the electrostrictive device ES is 0V, the electrostrictive device ES expands and contracts to the extent shown in fig. 6A, and when the voltage V across the electrostrictive device ES is the first voltage V1, the electrostrictive device ES expands and contracts to the extent shown in fig. 6B. In fig. 6A and 6B, reference numeral C denotes a storage capacitor.
The embedded touch screen comprises the touch module.
Specifically, the embedded touch screen further comprises an array substrate and a plurality of rows of grid lines arranged on the array substrate;
the grid lines are multiplexed into touch scanning lines included by the touch module.
The display device provided by the embodiment of the invention comprises the embedded touch screen. While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611013128.7A CN106354345B (en) | 2016-11-11 | 2016-11-11 | Touch unit, touch module, embedded touch screen and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611013128.7A CN106354345B (en) | 2016-11-11 | 2016-11-11 | Touch unit, touch module, embedded touch screen and display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106354345A CN106354345A (en) | 2017-01-25 |
| CN106354345B true CN106354345B (en) | 2020-01-10 |
Family
ID=57863056
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611013128.7A Expired - Fee Related CN106354345B (en) | 2016-11-11 | 2016-11-11 | Touch unit, touch module, embedded touch screen and display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106354345B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106980410B (en) * | 2017-04-01 | 2019-06-21 | 京东方科技集团股份有限公司 | Touch control detection circuit, its driving method, In-cell touch panel and display device |
| CN107422897B (en) * | 2017-04-20 | 2019-08-23 | 京东方科技集团股份有限公司 | A kind of touch control unit, touch-control circuit and its driving method, display panel |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103353813A (en) * | 2013-06-27 | 2013-10-16 | 京东方科技集团股份有限公司 | Touch drive circuit, optical embedded touch screen and display device |
| CN103412676A (en) * | 2013-07-29 | 2013-11-27 | 合肥京东方光电科技有限公司 | Touch screen and display device. |
| CN203366295U (en) * | 2013-06-27 | 2013-12-25 | 京东方科技集团股份有限公司 | Touch control drive circuit, optical type in-cell touch panel and display device |
| CN103592791A (en) * | 2013-08-28 | 2014-02-19 | 友达光电股份有限公司 | Substrate with touch control function and display adopting same |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI433011B (en) * | 2010-08-17 | 2014-04-01 | Chunghwa Picture Tubes Ltd | Optical touch module and optical touch display panel |
-
2016
- 2016-11-11 CN CN201611013128.7A patent/CN106354345B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103353813A (en) * | 2013-06-27 | 2013-10-16 | 京东方科技集团股份有限公司 | Touch drive circuit, optical embedded touch screen and display device |
| CN203366295U (en) * | 2013-06-27 | 2013-12-25 | 京东方科技集团股份有限公司 | Touch control drive circuit, optical type in-cell touch panel and display device |
| CN103412676A (en) * | 2013-07-29 | 2013-11-27 | 合肥京东方光电科技有限公司 | Touch screen and display device. |
| CN103592791A (en) * | 2013-08-28 | 2014-02-19 | 友达光电股份有限公司 | Substrate with touch control function and display adopting same |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106354345A (en) | 2017-01-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101462149B1 (en) | Touch sensor, liquid crystal display panel having the same and method of sensing the same | |
| CN102402332B (en) | Readout circuit for touch sensor | |
| US10345947B2 (en) | Apparatus and method for detecting hovering object, switching matrix, apparatus for determining compensation capacitance, method of compensating for force sensing capacitance, and apparatus for detecting force input | |
| CN105183248B (en) | Capacitance detection circuit, touch detection circuit, and semiconductor integrated circuit including the same | |
| CN100576024C (en) | Photosensitive display panel | |
| CN109976574B (en) | Integrator, touch display device and driving method thereof | |
| KR101617791B1 (en) | Touch sensor and liquid crystal display having the same | |
| CN108062540A (en) | fingerprint recognition detection circuit and its driving method, display panel and display device | |
| KR101659492B1 (en) | Charge Transfer Circuit for Capacitive Sensing and Apparatus For Detecting Fingerprint Having Thereof | |
| US20180211080A1 (en) | Fingerprint Identification Circuit, Touch Apparatus and Fingerprint Identification Method | |
| WO2015027584A1 (en) | Driving circuit and method, shift register, pixel unit, and display apparatus | |
| CN101101525A (en) | Touching control panel | |
| KR20190081704A (en) | Touch display device, touch driving circuit, and touch sensing method | |
| CN110162221B (en) | Touch display control device and touch display device | |
| CN106354345B (en) | Touch unit, touch module, embedded touch screen and display device | |
| CN109298804A (en) | Touch-control circuit and its driving method, touch base plate and display device | |
| CN108874195A (en) | Touch pixel-driving circuit and driving method, touch control display apparatus | |
| CN108288031B (en) | Sensitization drive circuit, sensitization device and electronic equipment | |
| CN108229388B (en) | Sensitization drive circuit, sensitization device and electronic equipment | |
| CN108133194B (en) | Photosensitive circuit, photosensitive device and electronic equipment | |
| US10394373B2 (en) | Active matrix touch panel with narrow bezel | |
| JP2014206844A (en) | Detection circuit, semiconductor integrated circuit device, and electronic apparatus | |
| KR101515281B1 (en) | Signal processing circuit of a touch screen | |
| JP2013015329A (en) | Sensor module and display device | |
| TW201209672A (en) | Optical touch module and optical touch display panel |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200110 |