CN106383622A - TDR scanning type touch screen, touch scanning positioning method and touch liquid crystal display screen - Google Patents
TDR scanning type touch screen, touch scanning positioning method and touch liquid crystal display screen Download PDFInfo
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- CN106383622A CN106383622A CN201610832012.XA CN201610832012A CN106383622A CN 106383622 A CN106383622 A CN 106383622A CN 201610832012 A CN201610832012 A CN 201610832012A CN 106383622 A CN106383622 A CN 106383622A
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- G—PHYSICS
- G06—COMPUTING OR CALCULATING; 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
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; 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
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0443—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a single layer of sensing electrodes
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3674—Details of drivers for scan electrodes
- G09G3/3677—Details of drivers for scan electrodes suitable for active matrices only
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- Theoretical Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Human Computer Interaction (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Computer Hardware Design (AREA)
- Position Input By Displaying (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
The invention discloses a TDR scanning touch screen, which comprises a touch area and a plurality of parallel and mutually independent wires arranged in the touch area, wherein an insulating layer is arranged above the wires; the TDR scanning touch screen also comprises a signal emitter, a reflected signal detector and a plurality of switching tubes; the input end of each conducting wire is correspondingly connected with the output end of one switching tube, the control end of each switching tube is correspondingly connected with a grid driver of the liquid crystal screen, and the common end of each switching tube is connected with the signal emitter and the reflected signal detector. The TDR scanning type touch screen disclosed by the invention can share the line scanning circuit of the liquid crystal screen to be used as the scanning circuit of the touch screen, so that the cost is effectively saved.
Description
Technical field
The present invention relates to touch screen field, more particularly, to a kind of scan-type touch screen Ji Yu otdr measurement (TDR),
Touch Scan orientation method and Touch-control liquid crystal display screen.
Background technology
Existing touch screen mainly has resistive touch screen, capacitive touch screen, infrared touch panel.
Resistive touch screen is mainly used in low-end product, generally only has single-touch function.Capacitive touch screen is extensive
There is manufacturing process complicated when being applied to various electronic products, but applying on oversize product, the problems such as relatively costly, institute
Infrared touch panel is usually used with large scale product.Infrared touch panel needs arrangement infrared transmitting tube and infrared receiver around screen
Pipe, leads to volume and thickness larger, and touch sensible also can be caused after piling up dust abnormal.
The present inventor finds during research and development this patent, either resistive touch screen, capacitive touch screen be still
Infrared touch panel, the scanning circuit of employing is all independently of the row/field-scanning circuit of liquid crystal display screen that is to say, that either resistance
Formula touch screen, capacitive touch screen or infrared touch panel, are required to extra scanning circuit to be scanned work, lead to into
This is higher, is unfavorable for cost-effective.
Content of the invention
It is an object of the invention to provide a kind of TDR scan-type touch screen, touch Scan orientation method and touch liquid crystal show
Display screen, can share the line-scan circuit of liquid crystal display screen, using the scanning circuit as touch screen, thus effectively save cost.
To achieve these goals, the TDR scan-type touch screen that one aspect of the present invention provides, including Petting Area and distribution
In some parallel and separate wires of described Petting Area, insulating barrier is set above described wire；Described TDR scan-type
Touch screen also includes signal projector, reflected signal detector and some switching tubes；The input of each described wire is right respectively
The outfan of a switching tube should be connected, the control end of each described switching tube corresponds to the gate drivers connecting liquid crystal display screen, often
The common port of switching tube described in connects described signal projector and described reflected signal detector.
Compared with prior art, the Petting Area distribution of the TDR scan-type touch screen that the present invention provides is a plurality of parallel and mutual
Separate conductors, the input of a plurality of wire is respectively used in turn or is shared a set of signal projector and reflected signal detector, wire
Switching is completed by sharing the gate drivers of liquid crystal display screen, and the input especially by each wire is connected respectively one and opens
Close the outfan of pipe, the corresponding gate drivers connecting liquid crystal display screen of control end of each described switching tube, each described switching tube
Common port connect described signal projector and described reflected signal detector, thus carrying out detecting impedance variation to realize touch-control
Positioning function.The TDR scan-type touch screen that the present invention provides is realized cutting Lai (scanning) by sharing the gate drivers of liquid crystal display screen
Change each wire and independently carry out signal transmitting and signal detection, extra scan drive circuit need not be set, can be effectively save
Cost.
As the improvement of such scheme, each described wire is transparent conductors.
As the improvement of such scheme, described switching tube is N-channel field effect transistor, the control end of described switching tube, public
End and outfan correspond respectively to grid, source electrode and the drain electrode of field effect transistor.
As the improvement of such scheme, the outfan of each described wire is hanging；Or, the output termination of each described wire
One end of load, the other end ground connection of described load.
A kind of Scan orientation method that touches that another aspect of the present invention provides is it is adaptable to including Petting Area and being distributed in institute
State the TDR scan-type touch screen of some parallel and separate wires of Petting Area, wherein, preset each described wire exists
Position on the first direction of touch screen, and each described wire extends in parallel along in the second direction of touch screen；Methods described
Comprise the following steps：
While liquid crystal display screen scans, send pulse signal successively by the gate drivers of liquid crystal display screen and described open to each
Close the control end of pipe, so that described signal projector is sequentially communicated and launch step signal to the input of each described wire, and
It is corresponding in turn to the reflected signal of the input receiving each described wire by described reflected signal detector；
The reflected signal of the arbitrary described wire receiving when described reflected signal detector and preset reference signal
When difference is more than default threshold value, start to launch step signal to described wire according to described signal projector, to described reflection
Signal detector receive described wire the difference with preset reference signal be more than default threshold value reflected signal when
Time delay, is calculated position in the second direction of touch screen for the touch objects.
Compared with prior art, the touch Scan orientation method that the present invention provides, by sharing the raster data model of liquid crystal display screen
Device carrys out (scanning) realization each wire of switching and independently carries out signal transmitting and signal detection, need not arrange extra turntable driving electricity
Road, being capable of effectively save cost.
As the improvement of such scheme, described first direction is Y direction, and described second direction is X-direction；Or, institute
Stating first direction is X-direction, and described second direction is Y direction.
Specifically, by following steps determine the reflected signal of arbitrary wire that described reflected signal detector receives with
The difference of preset reference signal is more than default threshold value：
The load that described reflected signal detector receives the reflected signal of described wire is calculated by below equation
Impedance：
Wherein, ZLReceive for described reflected signal detector described wire reflected signal when load impedance, Z0For pre-
If described wire characteristic impedance, ρ be reflection coefficient；Described reflection coefficient ρ is calculated by below equation：
Wherein, ViThe amplitude of the step signal launched to described wire for described signal projector, VrFor described reflected signal
Detector receives the amplitude of the reflected signal of described wire.
As described load impedance ZLWith described characteristic impedance Z0Difference when being more than preset value, determine the inspection of described reflected signal
The reflected signal of described wire that survey device receives is more than default threshold value with the difference of preset reference signal.
Compared with prior art, the touch Scan orientation method that the present invention provides, causes reflection letter by calculating on wire
Number the position that is more than during preset value of difference of the load impedance of impedance variation point and characteristic impedance be defined as touch point, thus real
Existing touch controllable function, it is to avoid the interference of improper touch-control, touch-control that such as dust accretions cause is abnormal, makes touch-control more accurate.
Specifically, start to launch step signal to described wire according to described signal projector, to the inspection of described reflected signal
Survey device receive described wire the difference with preset reference signal be more than default threshold value reflected signal when time prolong
Late, it is calculated position in the second direction of touch screen for the touch objects by following apart from computing formula：
Wherein, D is position in the second direction of touch screen for the described touch objects, and T is described time delay, erFor dielectric
Constant, C is the speed of optical transport.
A kind of Touch-control liquid crystal display screen that another aspect of the present invention provides, including liquid crystal display screen and touch screen, described liquid crystal
Screen includes gate drivers, and described touch screen adopts TDR scan-type touch screen structure as above.
Compared with prior art, the Touch-control liquid crystal display screen that the present invention provides, is shared same by touch screen and liquid crystal display screen
Gate drivers next (scanning) realization each wire of switching that individual line-scan circuit, specially touch screen share liquid crystal display screen independently enters
The transmitting of row signal and signal detection, need not arrange extra scan drive circuit for touch screen such that it is able to effectively save cost.
Brief description
Fig. 1 is the touch screen structure schematic diagram of the preferred embodiment of TDR scan-type touch screen that the present invention provides.
Fig. 2 is the cross-sectional structure of the touch screen of a preferred embodiment of TDR scan-type touch screen that the present invention provides
Schematic diagram.
Fig. 3 is that the circuit of the preferred embodiment of TDR scan-type touch screen that the present invention provides connects block diagram.
Fig. 4 a～Fig. 4 b shows the drive of the gate drivers of liquid crystal display screen that the TDR scan-type touch screen that the present invention provides shares
Dynamic circuit theory.
Fig. 5 is the conductor impedance equivalent model figure of the preferred embodiment of TDR scan-type touch screen that the present invention provides.
Fig. 6 is that in the preferred embodiment of TDR scan-type touch screen that the present invention provides, touch objects are contacted with touch screen
Schematic diagram.
Fig. 7 be the present invention provide a preferred embodiment of TDR scan-type touch screen the wire located at touch screen no
The impedance time-sequence curve chart of touch point.
Fig. 8 be the present invention provide TDR scan-type touch screen a preferred embodiment located at touch screen wire have tactile
Touch impedance time-sequence curve chart during point 8A.
Fig. 9 is that the wire located at touch screen of the preferred embodiment of TDR scan-type touch screen that the present invention provides has
Impedance time-sequence curve chart during the 8B of touch point.
Figure 10 is that a preferred embodiment of the TDR scan-type touch screen that the present invention provides is defeated located at the wire of touch screen
Enter the Injection Signal wavy curve figure at end.
Figure 11 is a kind of flow chart of the preferred embodiment of touch Scan orientation method that the present invention provides.
Figure 12 be in Figure 11 step S2 be embodied as flow chart.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation description is it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of not making creative work
Embodiment, broadly falls into the scope of protection of the invention.
Referring to Fig. 1, Fig. 1 is the touch screen structure of the preferred embodiment of TDR scan-type touch screen that the present invention provides
Schematic diagram.This TDR scan-type touch screen include Petting Area 1 and be distributed in some of Petting Area 1 parallel and separate
Wire 2.Each described wire 2 is transparent wire 2, and the distance between each described wire 2 and adjacent wires are equal.
It should be understood that the distance between adjacent two parallel wires 2 set according to the actual requirements, adjacent two parallel conductive
Spacing between line 2 is less, and amount of calculation is bigger, and computational accuracy is higher, and touch-control is more accurate.Constructed coordinate on Petting Area 1
In system, each wire 2 of setting corresponds to a coordinate position of the first direction (for example, Y-coordinate direction) of Petting Area 1 respectively,
And each described wire 2 extends in parallel along in the second direction (for example, X-coordinate direction) of Petting Area 1, so, every by calculating
The X-coordinate of the position of impedance variation is occurred on root wire, you can obtain corresponding position of touch.
Specifically, referring to Fig. 2, Fig. 2 is the cross-sectional structure schematic diagram of touch screen in the preferred embodiment, this present embodiment
TDR scan-type touch screen include substrate 10, some on substrate 10 parallel and separate wires 2 and cover
Insulating barrier 3 above described wire 2.Wherein, some parallel and separate wires 2 are distributed on whole Petting Area 1.
Wherein, substrate 10 can be glass substrate；The material of wire 2 adopts transparent and electrically conductive material, such as tin-doped indium oxide
(IndiumTinOxide), referred to as ITO；Insulating barrier 3 adopts silicon dioxide film or PET film.By in thin transparent diaphragm (lining
Bottom) on plate and cover silicon dioxide film on wire 2 surface after some parallel and separate wires 2 or PET film is constituted
The TDR scan-type touch screen of the present embodiment, then by the TDR obtaining scan-type touch screen be placed in display screen (for example, LCD, LED or
OLED etc.), to adapt to different display screens, thus being used for various touch control operations.
It should be understood that the TDR scan-type touch screen of the present embodiment can not also include substrate 10, but in liquid crystal display screen
Some parallel and separate wires 2 are directly plated in the way of plated film on glass substrate and covers absolutely on wire 2 surface
Formed after edge layer 3, so can reduce the thickness of touch screen further, meet the demand of super-thin touch screen.
9th, referring to Fig. 3, Fig. 3 is that the circuit of touch screen in the present embodiment connects block diagram.In the present embodiment, described TDR sweeps
The formula touch screen of retouching also includes signal projector 4, reflected signal detector 5 and some switching tubes 9.In conjunction with Fig. 2, wherein, each lead
The input 21 of line 2 is connected respectively the outfan 91 of a switching tube 9, and the control end 92 of each described switching tube 9 is corresponding
Connect the gate drivers 6 of liquid crystal display screen, the common port 93 of each described switching tube 9 is simultaneously connected with described signal projector 4 and institute
State reflected signal detector 5.Signal projector 4 is responsible for the input 21 that transmitting step signal 101 arrives wire 2, and reflected signal is examined
Survey device 5 to be responsible for receiving the reflected signal 102 of the input 21 of wire 2.
Send pulse signal successively to the control end 92 of each described switching tube 9 by the gate drivers 6 of liquid crystal display screen, make
Described signal projector 4 is sequentially communicated and launches the input 21 that step signal 101 arrives each described wire 2, and by described
Reflected signal detector 5 is corresponding in turn to the reflected signal 102 of the input 21 receiving each described wire 2.
The outfan 22 of each wire 2 connects one end of load 7, the other end ground connection of load 7.In addition, specifically real
Shi Shi, the TDR scan-type touch screen structure principle being provided based on the present invention, the outfan of each wire 2 can not also loading
7, make hanging process, above-mentioned improvement is also within protection scope of the present invention.According to TDR principle, in the TDR scanning of the present embodiment
In formula touch screen, when the outfan 22 of each wire 2 does not have signal transmitting when with its characteristic impedance termination (connecing load 7),
And there is the positive signal transmitting that amplitude is substantially equal to produced pulse when outfan 22 does not terminate (hanging).The present embodiment every
The load 7 that the outfan 22 of one wire 2 is connected has the resistance of the characteristic impedance being substantially equal to each wire 2.
It should be understood that in the present embodiment, the input 21 of each wire 2 can individually connect (exclusive) signal
Emitter 4 and a reflected signal detector 5, send pulse signal to each described successively by the gate drivers 6 of liquid crystal display screen
The control end 92 of switching tube 9, makes the input of each described wire 2 be sequentially connected the signal projector 4 of its connection to receive letter
The step signal 101 of number emitter 4 transmitting, and each reflected signal detector 5 receives the reflected signal of the corresponding wire connecting
102.
In addition, in order to reduce equipment cost, the input 21 of each wire 2 of the present embodiment also can connect (having) jointly
One signal projector 4 and a reflected signal detector 5, the gate drivers 6 of liquid crystal display screen send pulse signal successively to often
The control end 92 of switching tube 9 described in, so that described signal projector 4 is sequentially communicated and launch step signal 101 arrive each described
The input 21 of wire 2, and reflected signal detector 5 receives the reflected signal 102 of corresponding wire successively.
In the middle of being embodied as, each described switching tube 9 can be audion, field effect transistor, IGBT, IGCT etc. three end
Control device or its derivation device.Wherein, the control end of switching tube 9, common port and outfan, can correspond respectively to audion
Base stage, emitter stage, colelctor electrode, the grid of field effect transistor, source electrode, drain electrode, the grid of IGBT, emitter stage, colelctor electrode, unidirectional crystalline substance
The grid of brake tube, negative electrode, anode, the grid of bidirectional thyristor, port 1, port 2.
Below for convenience of description, only taking N-channel field effect transistor as a example the technical scheme of the embodiment of the present invention is described,
Switching tube in the TDR scan-type touch screen that the present invention provides is not limited to N-channel field effect transistor.
With reference to Fig. 4 a～Fig. 4 b, to further illustrate the TDR scanning of the present embodiment with reference to the scanning circuit of liquid crystal display screen
How formula touch screen independently carries out signal and sends out by sharing the gate drivers 6 (scanning) of liquid crystal display screen and to realize switching each wire
Penetrate and signal detection.
Wherein, Fig. 4 a is the logic drive circuit block diagram of liquid crystal display screen, and Fig. 4 b is that liquid crystal display screen is swept by gate drivers
The driving principle figure retouched.Specifically, the gate drivers 6 (horizontal drive circuit) of liquid crystal display screen are to the every one-row pixels on liquid crystal panel
The grid of point sends pulse, and the pulse signal that the pulse signal that next line pixel receives can receive than lastrow pixel has
Certain time delay, when the grid of any row pixel is high level (receiving the pulse signal of high level), the pixel of this row
Start working.
Therefore, the input 21 of each wire 2 in the passing through of the TDR scan-type touch screen of the present embodiment is corresponding passes through one
Individual N-channel field effect transistor connecting the gate drivers 6 of liquid crystal display screen, specifically, the grid of each described N-channel field effect transistor 9
The 92 corresponding gate drivers 6 connecting liquid crystal display screen, the drain electrode 91 of each described N-channel field effect transistor 9 is corresponding to connect a wire 2
Input 21, the source electrode 93 of each described N-channel field effect transistor 9 is corresponding to connect signal projector 4 and reflected signal detector
5.So, the pulse signal that the gate drivers 6 of liquid crystal display screen send is connected to this by the grid 92 of N-channel field effect transistor 9
The input 21 of each wire 2 in the TDR scan-type touch screen of embodiment, so, while liquid crystal display screen starts scanning, this
The touch screen of embodiment also can synchronous scanning.When the gate drivers 6 of liquid crystal display screen are sent to the N-channel of any bar wire 2 connection
When the grid 92 of field effect transistor 9 is high level (pulse signal is high level), the N-channel field effect transistor 9 that this wire connects is made to lead
Logical, so that this wire 2 communications signals emitter 4 and reflected signal detector 5, so that the input 21 of this wire 2 receives
The step signal 101 of described signal projector 4 transmitting, and receive the described of connection by described reflected signal detector 5 is corresponding
The reflected signal of the input 21 of wire 2, thus proceed by impedance detection.
Below, the impedance detection principle of TDR scan-type touch screen and the process of the present embodiment are described in detail.Referring to Fig. 5, scheme
5 is the equivalent impedance illustraton of model of each wire 2, and actual each wire 2 can be expressed as the defeated line of cascade of each section of equivalent network,
Can be equivalent to by distributed resistance R, distributed inductance L, be distributed the T-shaped network that the lamped element such as conductance G and distribution capacity C is constituted
Combination.For loss-free wire 2, the value of distributed resistance R and distribution conductance G is zero.
Here illustrate taking a T-shaped network as a example：Characteristic impedance Z and distributed resistance R, distributed inductance L, distribution conductance
The relation of G and distribution capacity C is expressed as following two formula：
Formula 1：
Formula 2：
Wherein U is the voltage being added in wire two ends, and I is the electric current by wire, can be derived by above-mentioned two formula
Characteristic impedanceFor loss-free wire：Characteristic impedance
Referring to Fig. 6, Fig. 6 is the schematic diagram that touch objects are contacted with touch screen.When touch objects touch, touch objects and insulating barrier
3 surface contact, touch objects, as a conductor, form an electric capacity between conductor and insulating barrier 3, make the distribution capacity C of wire 2
Produce change, at this moment wire 2 produces impedance variation at this touch point 8.Impedance variation can cause part signal to be reflected back wire
Input, part signal here is referred to as reflected signal 102.
Here taking the impedance of the wire 2 of outfan 22 zero load as a example illustrate：As shown in Figure 7, Figure 8 and Figure 9, Fig. 7, figure
8 and Fig. 9 it is arbitrary wire 2 no touch point respectively, have touch point 8A and have the impedance sequential in the case of tri- kinds of touch point 8B
Curve chart.Wherein, in the figure 7, curve 111 is the impedance curve of input 21, and curve 112 is the impedance curve of wire 2, curve
113 is the hanging impedance curve of outfan 22.For the contact point 8A and contact point 8B of the diverse location of same wire 2, Fig. 8
In curve 114 be that impedance variation curve caused by touch point 8A, the curve 115 in Fig. 9 is to cause resistance by touch point 8B
Anti- change curve.Touch location on same wire 2 is different, causes the time point of impedance variation not on impedance characteristic
With.
When being embodied as, the input 21 of a plurality of parallel wire 2 completes step signal 101 by signal projector 4 successively
Input and the reception being completed reflected signal 102 by reflected signal detector 5, the switching of wire 2 is completed by scan drive circuit 6.
Below, in conjunction with Fig. 1 and Figure 10, describe the work process of the TDR scan-type touch screen of the present embodiment in detail.Referring to figure
1, the first direction of the TDR scan-type touch screen adopting in the present embodiment is mutually perpendicular to second direction；Wherein, set first party
To for Y direction, set second direction as X-direction.
First, in the position of described Y direction, each wire 2 is pre- successively along order from left to right for preset each wire 2
Set is set to Y, Y+1, Y+2 ... Y+n, and each wire 2 extends in parallel along X-direction.
While liquid crystal display screen scans, send pulse signal successively to each described N by the gate drivers 6 of liquid crystal display screen
The grid 92 of channel field-effect pipe 9, makes described signal projector 4 be sequentially communicated and launches step signal 101 described to lead to each
The input 21 of line 2.It is corresponding in turn to the reflection letter of the input 21 receiving each wire 2 by reflected signal detector 5 simultaneously
Numbers 102.
Referring to Figure 10, Figure 10 is the Injection Signal wavy curve figure of the input 21 of wire 2, and Injection Signal includes transmitting letter
Numbers 101 and reflected signal 102, this curve represents the relation of voltage amplitude sequential.As shown in Figure 10, the voltage of reflected signal
Amplitude is relevant with the load impedance of wire 2.
Specifically, especially by following steps, reflected signal detector 5 determines whether received reflected signal 102 is tactile
The normal touch touching thing causes reflected signal 102 produced by impedance variation：
First, the reflection that reflected signal detector 5 receives the reflected signal 102 of wire 2 is calculated by below equation (b)
Coefficient ρ：
Wherein, ViFor the amplitude of the step signal 101 of signal projector 4 guiding line 2 transmitting, VrFor reflected signal detector 5
Receive reflected signal 102 amplitude of wire 2.
Then, the load impedance Z of this reflected signal 102 is calculated by below equation (a)L：
Wherein, Z0Characteristic impedance for wire 2.
The load impedance Z of gained will be calculatedLWith characteristic impedance Z0It is compared, as load impedance ZLWith characteristic impedance Z0's
When difference is more than preset value, determine that this reflected signal 102 and the difference of preset reference signal are more than default threshold value.This step
Rapid is to determine that the normal touch that this reflected signal 102 is touch objects causes reflected signal 102 produced by impedance variation, works as determination
The reflected signal 102 receiving this wire 2 is the normal touch of touch objects when causing reflected signal 102 produced by impedance variation,
Then need to carry out the location positioning of the touch point 8 of next step according to this reflected signal 102.Specifically include：
Obtain signal projector 4 from the input 21 transmitting step signal to the place wire 2 producing this reflected signal 102
101 to time delay T receiving this transmission signal 102, and is calculated touch point 8 according to following apart from computing formula (c)
Position in the X-direction of this wire 2：
Wherein, D is touch point position in the X-axis direction, erFor dielectric constant, C is the speed of optical transport.
The position D of gained is converted to X-coordinate, and combines the Y in the Y direction of wire 2 that this reflected signal 102 is located
Coordinate, determines position coordinateses point (X, Y) of touch point 8.It is anti-that system can make corresponding touch-control according to the position of touch point 8
Should.
When being embodied as, while liquid crystal display screen scans, send pulse signal successively by the gate drivers 6 of liquid crystal display screen
To the grid 92 of each described N-channel field effect transistor 9, make described signal projector 4 be sequentially communicated and launch step signal 101 to arrive
The input 21 of each described wire 2, is detected the reflection letter of the input 21 of corresponding lead 2 simultaneously by reflected signal detector 5
Numbers 102.
When touch objects are touched on the touchscreen, wire 2 impedance variation of this point of touch point 8；Reflected signal detects
Device 5 receives the reflected signal 102 causing from this touch point 8；By calculating the load impedance Z of this reflected signal 102L, when
Load impedance ZLWith default characteristic impedance Z0Difference when exceeding preset value, carry out the position calculation of touch point 8；By this reflection
The wire 2 input step signal 101 that signal 102 is located calculates X-coordinate, knot to time delay T this reflected signal 102 is detected
The position closing place wire 2 determines Y-coordinate, draws touch point 8 position by coordinate points (X, Y), thus realizing whole touch screen
Touch controllable function.
The Petting Area of the TDR scan-type touch screen that the present invention provides is distributed a plurality of parallel and separate wire, a plurality of leads
The input of line respectively uses or shares a set of signal projector and reflected signal detector in turn, and the switching of wire is by sharing liquid crystal
The gate drivers of screen complete, and the input especially by each wire is connected respectively the outfan of a switching tube, often
The corresponding gate drivers connecting liquid crystal display screen of the control end of switching tube described in, the common port connection of each described switching tube is described
Signal projector and described reflected signal detector, thus carry out detecting impedance variation to realize touch-control positioning function.The present invention
The TDR scan-type touch screen providing independently is entered in (scanning) realization each wire of switching by sharing the gate drivers of liquid crystal display screen
The transmitting of row signal and signal detection, need not arrange extra scan drive circuit, being capable of effectively save cost.
With reference to Figure 11, present embodiments provide a kind of touch Scan orientation method, this touch Scan orientation method is applied to
TDR scan-type touch screen as above, described TDR scan-type touch screen includes Petting Area and is distributed in described Petting Area
Some parallel and separate wires, arrange insulating barrier above described wire；Described TDR scan-type touch screen also includes letter
Number emitter, reflected signal detector and some switching tubes；The input of each described wire is connected respectively a switch
The outfan of pipe, the corresponding gate drivers connecting liquid crystal display screen of control end of each described switching tube, each described switching tube
Common port connects described signal projector and described reflected signal detector.Wherein, preset each described wire is in touch screen
Position on first direction (for example, Y-coordinate direction), and each described wire is along second direction (for example, the X-coordinate of touch screen
Direction) on extend in parallel.The touch Scan orientation method of the present embodiment includes step S1～step S2：
S1, while liquid crystal display screen scans, send pulse signal successively to each institute by the gate drivers of liquid crystal display screen
State the control end of switching tube, so that described signal projector is sequentially communicated and launch step signal to the input of each described wire
End, and it is corresponding in turn to the reflected signal of the input receiving each described wire by described reflected signal detector；
S2, the reflected signal of arbitrary described wire and the preset reference signal receiving when described reflected signal detector
Difference when being more than default threshold value, start to launch step signal to described wire according to described signal projector, to described anti-
Penetrate signal detector receive described wire the difference with preset reference signal be more than default threshold value reflected signal when
Time delay, be calculated position in the second direction of touch screen for the touch objects.
Wherein, step S1 is used for touch screen being scanned with (specifically to the transmitting of each wire and detection signal), to determine
Touch point be whether there is on touch screen.When being embodied as, in step sl, described switching tube adopts N-channel field effect transistor, described
The control end of switching tube, common port and outfan correspond respectively to grid, source electrode and the drain electrode of field effect transistor.Grid by liquid crystal display screen
The pulse signal that driver sends each is led by what the grid of N-channel field effect transistor was connected in TDR scan-type touch screen
The input of line, so, while liquid crystal display screen starts scanning, touch screen also can synchronous scanning.Raster data model when liquid crystal display screen
When the grid that device is sent to the N-channel field effect transistor of any bar wire connection is high level (pulse signal is high level), make this
The N-channel field effect transistor conducting that wire connects, so that this wire communications signals emitter and reflected signal detector, so that
The input of this wire receives the step signal of described signal projector transmitting, and is connect by described reflected signal detector correspondence
Receive the reflected signal of the input of described wire connecting, thus proceeding by impedance detection.
Step S2 be used for determine touch point particular location on the touchscreen, be to determine first touch point be located at which (or
Which) wire (by detecting whether transmission signal and the difference of preset reference signal are more than default threshold value), Ran Houzai
The concrete touch point that calculates is located at the particular location being somebody's turn to do on (or multiple) wire.
Specifically, in step s 2, determine, by following steps, arbitrary wire that described reflected signal detector receives
The difference of reflected signal and preset reference signal be more than default threshold value, with reference to Figure 12, step S2 specifically includes step
S211～S214：
S211, be calculated by below equation (a) described reflected signal detector receive described wire reflection letter
Number load impedance：
Wherein, ZLReceive for described reflected signal detector described wire reflected signal when load impedance, Z0For pre-
If described wire characteristic impedance, ρ be reflection coefficient；Wherein, described reflection coefficient ρ is calculated by below equation (b)：
Wherein, ViThe amplitude of the step signal launched to described wire for described signal projector, VrFor described reflected signal
Detector receives the amplitude of the reflected signal of described wire.
S212, as described load impedance ZLWith described characteristic impedance Z0Difference be more than preset value when, determine described reflection letter
Number reflected signal of described wire that detector receives is more than default threshold value with the difference of preset reference signal.
Anti- produced by impedance variation determining that the normal touch that the reflected signal receiving any wire is touch objects causes
Penetrating signal is, then need to carry out the position of the touch point of next step according to this reflected signal.Specifically include step：
S213, according to described signal projector start to described wire transmitting step signal to described reflected signal detector
Receive, to described wire and preset reference signal difference be more than default threshold value reflected signal when time delay,
It is calculated position in the second direction of touch screen for the touch objects by following apart from computing formula (c)：
Wherein, D is position in the second direction of touch screen for the described touch objects, and T is described time delay, erFor dielectric
Constant, C is the speed of optical transport.
S214, the coordinate (for example, X-coordinate) the distance and position D of gained being converted in second direction, and combine this reflection
The coordinate (for example, Y-coordinate) on the first direction of wire that signal is located, may thereby determine that the position coordinateses point of touch point
(X,Y).
So, behind the position determining touch point, system can make corresponding touch-control reaction according to the position of touch point.
The touch Scan orientation method that the present embodiment provides, is realized Lai (scanning) by sharing the gate drivers of liquid crystal display screen
Switch each wire and independently carry out signal transmitting and signal detection, extra scan drive circuit need not be set and can achieve entirely
The touch controllable function of Petting Area, the simple and effectively save hardware cost of scan method；And a plurality of wire can share a set of signal sends out
Emitter and reflected signal detector, low for equipment requirements, reduction with cost lightening beneficial to touch screen；In addition, only need to pass through
Calculate the time of the reflected signal of this wire that input step signal receives on arbitrary wire to described reflected signal detector
Postpone just to calculate air line distance on this wire for the impedance variation point causing reflected signal, in conjunction with the presetting bit of this wire
Put positioning touch point, algorithm is easy, and processing data difficulty is low.
The embodiment of the present invention additionally provides a kind of Touch-control liquid crystal display screen, including liquid crystal display screen and touch screen, wherein, described liquid
Brilliant screen includes gate drivers, realizes the row picture element scan on liquid crystal panel by gate drivers.Described touch screen is swept for TDR
Retouch formula touch screen, including Petting Area and some parallel and separate wires being distributed in described Petting Area, described lead
Insulating barrier is set above line；Described TDR scan-type touch screen also includes signal projector, reflected signal detector and some switches
Pipe；The input of each described wire is connected respectively the outfan of a switching tube, the control end of each described switching tube
The corresponding gate drivers connecting described liquid crystal display screen, the common port of each described switching tube connects described signal projector and described
Reflected signal detector.
Wherein, the TDR scan-type touch screen of the present embodiment can using laminated construction as shown in Figure 2 constitute one independent
After touch screen, then it is connected with described liquid crystal display screen to constitute the Touch-control liquid crystal display screen of the present embodiment.The TDR scan-type of the present embodiment
Touch screen directly can also be plated in the way of plated film on the glass substrate of liquid crystal display screen display screen some parallel and mutually only
Vertical wire and formation after conductive line surfaces cover insulating barrier, so can reduce the thickness of touch screen further, meet ultra-thin
The demand of type touch screen.
To sum up, the Touch-control liquid crystal display screen that the present embodiment provides, shares same row scanning by touch screen and liquid crystal display screen
Gate drivers next (scanning) realization each wire of switching of the shared liquid crystal display screen of circuit, specially touch screen independently carries out signal and sends out
Penetrate and signal detection, need not be for the touch screen extra scan drive circuit of setting such that it is able to effectively save cost.
The above is the preferred embodiment of the present invention it is noted that for those skilled in the art
For, under the premise without departing from the principles of the invention, some improvement can also be made and deform, these improve and deformation is also considered as
Protection scope of the present invention.
Claims (10)
1. a kind of TDR scan-type touch screen is it is characterised in that described TDR scan-type touch screen includes Petting Area and is distributed in
Some parallel and separate wires of described Petting Area, arrange insulating barrier above described wire；Described TDR scan-type touches
Touch screen and also include signal projector, reflected signal detector and some switching tubes；The input of each described wire corresponds to respectively
Connect the outfan of a switching tube, the control end of each described switching tube corresponds to the gate drivers connecting liquid crystal display screen, each
The common port of described switching tube connects described signal projector and described reflected signal detector.
2. TDR scan-type touch screen according to claim 1 is it is characterised in that each described wire is transparent conductors.
3. TDR scan-type touch screen according to claim 1 is it is characterised in that described switching tube is N-channel field effect
Pipe, the control end of described switching tube, common port and outfan correspond respectively to grid, source electrode and the drain electrode of field effect transistor.
4. TDR scan-type touch screen according to claim 2 is it is characterised in that the outfan of each described wire is hanging；
Or, one end of the output terminating load of each described wire, the other end ground connection of described load.
5. a kind of touch Scan orientation method is it is characterised in that being applied to including Petting Area and being distributed in described Petting Area
The TDR scan-type touch screen of some parallel and separate wires, wherein, preset each described wire is the of touch screen
Position on one direction, and each described wire extends in parallel along in the second direction of touch screen；Methods described includes following step
Suddenly：
While liquid crystal display screen scans, send pulse signal successively to each described switching tube by the gate drivers of liquid crystal display screen
Control end, so that described signal projector is sequentially communicated and launch step signal to the input of each described wire, and pass through
Described reflected signal detector is corresponding in turn to the reflected signal of the input receiving each described wire；
The reflected signal of the arbitrary described wire receiving when described reflected signal detector and the difference of preset reference signal
During more than default threshold value, start to examine to described wire transmitting step signal to described reflected signal according to described signal projector
Survey device to receive, to described wire and preset reference signal difference be more than default threshold value reflected signal when time prolong
Late, it is calculated position in the second direction of touch screen for the touch objects.
6. according to claim 5 touch Scan orientation method it is characterised in that described first direction be Y direction, institute
Stating second direction is X-direction；Or, described first direction is X-direction, described second direction is Y direction.
7. touch Scan orientation method according to claim 5 is it is characterised in that determine described reflection by following steps
The reflected signal of arbitrary wire that signal detector receives is more than default threshold value with the difference of preset reference signal：
The load resistance that described reflected signal detector receives the reflected signal of described wire is calculated by below equation (a)
Anti-：
Wherein, ZLReceive for described reflected signal detector described wire reflected signal when load impedance, Z0For default
The characteristic impedance of described wire, ρ is reflection coefficient；Described reflection coefficient ρ is calculated by below equation (b)：
Wherein, ViThe amplitude of the step signal launched to described wire for described signal projector, VrFor the detection of described reflected signal
Device receives the amplitude of the reflected signal of described wire；
As described load impedance ZLWith described characteristic impedance Z0Difference be more than preset value when, determine described reflected signal detector
The reflected signal of described wire receiving is more than default threshold value with the difference of preset reference signal.
8. according to claim 5 touch Scan orientation method it is characterised in that according to described signal projector start to
Step signal launched by described wire, receives the difference with preset reference signal of described wire to described reflected signal detector
Value is more than the time delay during reflected signal of default threshold value, is calculated touch objects in touch screen by below equation (c)
Second direction on position：
Wherein, D is position in the second direction of touch screen for the described touch objects, and T is described time delay, erFor dielectric constant,
C is the speed of optical transport.
9. a kind of Touch-control liquid crystal display screen is it is characterised in that include：
Liquid crystal display screen, described liquid crystal display screen includes gate drivers；And
TDR scan-type touch screen as described in any one of Claims 1 to 4.
10. Touch-control liquid crystal display screen as claimed in claim 9 is it is characterised in that the conductor layer of described TDR scan-type touch screen
It is formed directly on liquid crystal display screen by the form of plated film.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610832012.XA CN106383622A (en) | 2016-09-19 | 2016-09-19 | TDR scanning type touch screen, touch scanning positioning method and touch liquid crystal display screen |
| PCT/CN2016/113559 WO2018049764A1 (en) | 2016-09-19 | 2016-12-30 | Tdr scan-type touch screen, touch scan locating method, and touch liquid crystal display screen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610832012.XA CN106383622A (en) | 2016-09-19 | 2016-09-19 | TDR scanning type touch screen, touch scanning positioning method and touch liquid crystal display screen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106383622A true CN106383622A (en) | 2017-02-08 |
Family
ID=57936624
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610832012.XA Pending CN106383622A (en) | 2016-09-19 | 2016-09-19 | TDR scanning type touch screen, touch scanning positioning method and touch liquid crystal display screen |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN106383622A (en) |
| WO (1) | WO2018049764A1 (en) |
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| CN201212989Y (en) * | 2008-07-02 | 2009-03-25 | 成都吉锐触摸技术股份有限公司 | Laser scanning type touch screen |
| CN102364415B (en) * | 2011-06-28 | 2013-08-21 | 广东威创视讯科技股份有限公司 | Infrared touch screen multi-touch-point recognition method and device |
| TW201312529A (en) * | 2011-09-01 | 2013-03-16 | Chunghwa Picture Tubes Ltd | Display, timing controller and operation method thereof |
| CN103309067A (en) * | 2012-03-08 | 2013-09-18 | 鸿富锦精密工业（深圳）有限公司 | Liquid crystal display panel |
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| WO2018049764A1 (en) | 2018-03-22 |
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Application publication date: 20170208 |