CN106354330B - Touch screen response method and device based on user input pressure - Google Patents
Touch screen response method and device based on user input pressure Download PDFInfo
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- CN106354330B CN106354330B CN201610833402.9A CN201610833402A CN106354330B CN 106354330 B CN106354330 B CN 106354330B CN 201610833402 A CN201610833402 A CN 201610833402A CN 106354330 B CN106354330 B CN 106354330B
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- 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
- G06F3/0414—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using force sensing means to determine a position
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- 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
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
Abstract
The invention discloses a touch screen response method based on user input pressure, which is suitable for a TDR scanning type touch screen and comprises a plurality of parallel and independent leads, wherein the input end of each lead is respectively connected with a signal emitter and a reflected signal detector, and the signal emitter is connected with a scanning driving circuit; the touch screen response method comprises the following steps: s1, when the scanning driving circuit drives the signal emitter to sequentially emit step signals to the input end of each lead, the reflected signal detector is received to sequentially and correspondingly receive the reflected signals of the input end of each lead; s2, calculating the load impedance of the reflected signal of each wire received by the reflected signal detector; s3, when the difference value between the load impedance and the characteristic impedance is larger than a preset value, executing a corresponding response event according to the size of the difference value and a preset mapping table; and recording the corresponding relation between the difference value and the response event in the mapping table.
Description
Technical Field
The invention relates to the field of touch screens, in particular to a touch screen response method and device based on user input pressure.
Background
The existing touch screen mainly comprises a resistance type touch screen, a capacitance type touch screen and an infrared touch screen.
Resistive touch screens are mainly used in low-end products, and usually have only a single-touch function. The capacitive touch screen is widely applied to various electronic products, but when the capacitive touch screen is applied to products with super-large sizes, the problems of complex manufacturing process, high cost and the like exist, so the infrared touch screen is commonly used for products with large sizes. The infrared touch screen needs to arrange an infrared transmitting tube and an infrared receiving tube around the screen, so that the size and the thickness are large, and abnormal touch induction can be caused after dust is accumulated.
The inventor finds that no matter the resistive touch screen, the capacitive touch screen or the infrared touch screen can only realize the positioning function at present, but does not have the function of checking the pressure of the user in the process of researching and developing the patent. If the touch pressure of the user needs to be checked, an additional pressure sensor is needed to detect the touch pressure of the user, so that a corresponding response event is executed, and the addition of the additional pressure sensor not only increases the complexity of the manufacturing process of the touch screen, but also increases the cost, and is not beneficial to saving the cost.
Disclosure of Invention
The invention aims to provide a touch screen response method and device based on user input pressure, which are suitable for a TDR scanning type touch screen, can respond to an event according to the touch pressure of a user under the condition of not needing an additional pressure sensor, have simple manufacturing process and effectively save cost.
In order to achieve the above object, an aspect of the present invention provides a touch screen response method based on user input pressure, which is applicable to a TDR scanning touch screen, where the TDR scanning touch screen includes a touch area and a plurality of parallel and independent wires arranged in the touch area, an input end of each wire is connected to a signal emitter and a reflected signal detector, respectively, and the signal emitter is connected to a scanning driving circuit; the touch screen response method comprises the following steps:
s1, driving the signal emitter to sequentially emit step signals to the input end of each lead by the scanning driving circuit, and receiving the reflected signals of the input end of each lead correspondingly and sequentially received by the reflected signal detector;
s2, calculating the load impedance Z of the reflected signal of each wire received by the reflected signal detectorL；
S3, when the load impedance Z isLWith a predetermined characteristic impedance Z of the corresponding wire0Difference value Z ofDifference (D)When greater than a predetermined value, according to ZDifference (D)The size of the corresponding event and a preset mapping table are executed; wherein, Z is recorded in the mapping tableDifference (D)The correspondence between the size and the response event.
Compared with the prior art, the touch screen response method based on the user input pressure is based on a plurality of parallel and mutually independent conducting wires distributed on a TDR scanning type touch screen, the signal emitter, the reflected signal detector and the scanning driving circuit are utilized to obtain the reflected signal of each conducting wire, the impedance change of the reflected signal of each conducting wire is obtained through calculation, the impedance change is larger according to the larger pressure, therefore, the corresponding response event can be executed according to a preset mapping table for recording the corresponding relation between the impedance change and the response event, the response event can be realized according to the touch pressure of a user under the condition of no need of an additional pressure sensor, the manufacturing process is simple, and the cost is effectively saved.
As an improvement of the above scheme, the step S2 specifically includes:
calculating the load impedance of the reflected signal of each wire received by the reflected signal detector according to the following formula:
wherein Z isLIs the load impedance, Z, of the reflected signal of the wire when the reflected signal detector receives the reflected signal of the wire0P is a reflection coefficient, which is a preset characteristic impedance of the lead; the reflection coefficient ρ is calculated by the following formula:
wherein, ViAmplitude, V, of step signal transmitted to said conductor for said signal transmitterrThe amplitude of the reflected signal of the wire received by the reflected signal detector.
As an improvement of the scheme, the method further comprises the following steps:
s4, when the load impedance Z isLAnd the characteristic impedance Z0Difference value Z ofDifference (D)When the load impedance is larger than the preset value, the load impedance Z of the reflected signal of the lead received by the reflected signal detector is reached according to the fact that the signal emitter starts to emit step signals to the leadLAnd the characteristic impedance Z0Difference value Z ofDifference (D)Calculating the position of the touch object in the second direction of the touch screen by the time delay when the time delay is larger than the preset value, so as to obtain the coordinate position (X, Y) of the touch object on the touch screen; and X is the position of the touch object in the second direction of the touch screen, and Y is the preset position of the conducting wire in the first direction of the touch screen.
The touch screen response method based on the user input pressure, provided by the embodiment of the invention, can detect the touch pressure of the user in real time to respond to an event according to the touch pressure of the user, can also detect the touch position of the user in real time, completes the corresponding response event simultaneously by combining the touch position and the touch pressure, has high response speed, and can effectively improve the user experience.
As an improvement of the above scheme, the position of the touch object in the second direction of the touch screen is calculated by the following distance calculation formula:
wherein X is the position of the touch object in the second direction of the touch screen, T is the time delay, erAnd C is the speed of light transmission.
As an improvement of the above solution, the driving, by the scan driving circuit, the signal emitter to sequentially emit the step signal to the input end of each of the conductive lines includes:
and driving the signal emitter to emit step signals to the input end of each lead line by line along the first direction of the touch screen through the scanning driving circuit.
As an improvement of the above solution, the driving, by the scan driving circuit, the signal emitter to sequentially emit the step signal to the input end of each of the conductive lines includes:
firstly, the scanning driving circuit drives the signal emitters to emit step signals to the input end of each conducting wire in an odd-numbered line row by row along a first direction of the touch screen; and driving the signal emitters to emit step signals to the input ends of the leads positioned on the even-numbered rows line by line along the first direction of the touch screen through the scanning driving circuit.
As an improvement of the above solution, the first direction is a Y-axis direction, and the second direction is an X-axis direction; or, the first direction is an X-axis direction, and the second direction is a Y-axis direction.
Another aspect of the embodiments of the present invention provides a touch screen response device based on user input pressure, which is suitable for a TDR scanning touch screen, where the TDR scanning touch screen includes a touch area and a plurality of parallel and independent wires arranged in the touch area, an input end of each wire is connected to a signal emitter and a reflected signal detector, and the signal emitter is connected to a scanning driving circuit; the touch screen response device comprises:
the reflected signal receiving module is used for driving the signal emitter to sequentially emit step signals to the input end of each lead by the scanning driving circuit and receiving the reflected signals of the input end of each lead sequentially and correspondingly received by the reflected signal detector;
a load impedance calculation module for calculating the load impedance Z of the reflected signal of each wire received by the reflected signal detectorL；
A response module for measuring the load impedance ZLWith a predetermined characteristic impedance Z of the corresponding wire0Difference value Z ofDifference (D)When greater than a predetermined value, according to ZDifference (D)The size of the corresponding event and a preset mapping table are executed; wherein, Z is recorded in the mapping tableDifference (D)The correspondence between the size and the response event.
The touch screen response device based on the user input pressure is based on a plurality of parallel and mutually independent conducting wires distributed on a TDR scanning type touch screen, a signal emitter, a reflected signal detector and a scanning driving circuit are utilized to obtain a reflected signal of each conducting wire, the impedance change of the reflected signal of each conducting wire is obtained through calculation, and according to the principle that the impedance change is larger when the pressure is larger, the corresponding response event can be executed according to a preset mapping table for recording the corresponding relation between the impedance change and the response event, the response event can be realized according to the touch pressure of a user under the condition of no need of an additional pressure sensor, the manufacturing process is simple, and the cost is effectively saved.
As an improvement of the above solution, the load impedance calculation module is further configured to calculate a load impedance of the reflected signal received by the reflected signal detector to each of the wires by using the following formula:
wherein Z isLIs the load impedance, Z, of the reflected signal of the wire when the reflected signal detector receives the reflected signal of the wire0P is a reflection coefficient, which is a preset characteristic impedance of the lead; the reflection coefficient ρ is calculated by the following formula:
wherein, ViAmplitude, V, of step signal transmitted to said conductor for said signal transmitterrThe amplitude of the reflected signal of the wire received by the reflected signal detector.
As an improvement of the above scheme, the method further comprises the following steps:
a touch point calculation module for calculating the touch point when the load impedance Z isLAnd the characteristic impedance Z0Difference value Z ofDifference (D)When the load impedance is larger than the preset value, the step signal is transmitted to the wire by the signal transmitter, and the load impedance Z of the reflected signal of the wire is received by the reflected signal detectorLAnd the characteristic impedance Z0Difference value Z ofDifference (D)Calculating the position of the touch object in the second direction of the touch screen by the time delay when the time delay is larger than the preset value, so as to obtain the coordinate position (X, Y) of the touch object on the touch screen; and X is the position of the touch object in the second direction of the touch screen, and Y is the preset position of the conducting wire in the first direction of the touch screen.
As an improvement of the above solution, the touch point calculating module is further configured to: and calculating the position of the touch object in the second direction of the touch screen by the following distance calculation formula:
wherein X is the position of the touch object in the second direction of the touch screen, T is the time delay, erIs a dielectric constantAnd C is the speed of light transmission.
As an improvement of the above solution, the first direction is a Y-axis direction, and the second direction is an X-axis direction; or, the first direction is an X-axis direction, and the second direction is a Y-axis direction.
Drawings
Fig. 1a is a schematic flowchart of a touch screen response method based on user input pressure according to a preferred embodiment of the present invention.
Fig. 1b is a schematic flowchart of another touch screen response method based on user input pressure according to a preferred embodiment of the present invention. Fig. 1c is a schematic flowchart of a touch screen response method based on user input pressure according to a preferred embodiment of the present invention.
Fig. 2 is a schematic diagram of a touch screen structure of a TDR scanning touch screen according to a preferred embodiment of the present invention.
Fig. 3 is a schematic cross-sectional structure diagram of the TDR scanning touch screen of fig. 2.
FIG. 4 is a block diagram of the electrical connections of a preferred embodiment of a TDR scanning touch screen for performing the touch screen response method of the present invention.
FIG. 5 is a diagram of an equivalent model of wire impedance for a preferred embodiment of a TDR scanning touch screen for performing the touch screen response method of the present invention.
Fig. 6 is a schematic diagram of a touch object contacting the touch screen in a preferred embodiment of the TDR scanning touch screen provided in the present invention.
FIG. 7 is a graph of impedance versus time for a conductor no touch point disposed on a touch screen for a preferred embodiment of a TDR scanning touch screen for performing a touch screen response method of the present invention.
FIG. 8 is a graph of impedance versus time for a TDR scanning touch screen for implementing a touch screen response method of the present invention at touch point 8A on a conductive line of the touch screen.
FIG. 9 is a graph of impedance versus time for a lead disposed on a touch screen having a touch point 8B for a preferred embodiment of a TDR scanning touch screen for performing the touch screen response method of the present invention.
FIG. 10 is a graph of a waveform of an injected signal applied to an input end of a conductive line of a touch screen in a TDR scanning type touch screen for performing a touch screen response method of the present invention.
Fig. 11a is a block diagram illustrating a preferred embodiment of a touch screen response device based on a user input pressure according to the present invention.
Fig. 11b is a block diagram of another preferred embodiment of a touch screen response device based on user input pressure according to the present invention.
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.
Referring to fig. 1a, the present invention provides a touch screen response method based on user input pressure, which is applicable to a TDR scanning touch screen, where the TDR scanning touch screen includes a touch area and a plurality of parallel and independent wires disposed in the touch area, an input end of each wire is connected to a signal emitter and a reflected signal detector, respectively, and the signal emitter is connected to a scanning driving circuit; the touch screen response method comprises the following steps:
s1, driving the signal emitter to sequentially emit step signals to the input end of each lead by the scanning driving circuit, and receiving the reflected signals of the input end of each lead correspondingly and sequentially received by the reflected signal detector;
s2, calculating the load impedance Z of the reflected signal of each wire received by the reflected signal detectorL；
S3, when the load impedance Z isLWith a predetermined characteristic impedance Z of the corresponding wire0Difference value Z ofDifference (D)When greater than a predetermined value, according to ZDifference (D)The size of the corresponding event and a preset mapping table are executed; wherein, Z is recorded in the mapping tableDifference (D)The correspondence between the size and the response event.
Referring to fig. 1b, the present invention provides a touch screen response method based on user input pressure, which is suitable for a TDR scanning touch screen, where the TDR scanning touch screen includes a touch area and a plurality of parallel and independent wires disposed in the touch area, an input end of each wire is connected to a signal emitter and a reflected signal detector, respectively, and the signal emitter is connected to a scanning driving circuit; the touch screen response method comprises the following steps:
s1, driving the signal emitter to sequentially emit step signals to the input end of each lead by the scanning driving circuit, and receiving the reflected signals of the input end of each lead correspondingly and sequentially received by the reflected signal detector;
s2', calculating the load impedance of the reflected signal received by the reflected signal detector to each of the wires according to the following formula:
wherein Z isLIs the load impedance, Z, of the reflected signal of the wire when the reflected signal detector receives the reflected signal of the wire0P is a reflection coefficient, which is a preset characteristic impedance of the lead; the reflection coefficient ρ is calculated by the following formula:
wherein, ViAmplitude, V, of step signal transmitted to said conductor for said signal transmitterrThe amplitude of the reflected signal of the wire received by the reflected signal detector;
s3, when the load impedance Z isLAnd the characteristic impedance Z0Difference value Z ofDifference (D)When greater than a predetermined value, according to ZDifference (D)Size of (2) and preset mapping table executionA corresponding response event; wherein, Z is recorded in the mapping tableDifference (D)The correspondence between the size and the response event.
In another embodiment, as shown in fig. 1c, in addition to detecting the pressure of the touch of the user in real time to respond to the event according to the magnitude of the touch pressure of the user, the embodiment can also detect the touch position of the user in real time, so as to combine the touch position and the touch pressure to simultaneously complete the corresponding response event, and the embodiment further includes the following steps on the basis of fig. 1a or fig. 1 b:
s4, when the load impedance Z isLAnd the characteristic impedance Z0Difference value Z ofDifference (D)When the load impedance is larger than the preset value, the step signal is transmitted to the wire by the signal transmitter, and the load impedance Z of the reflected signal of the wire is received by the reflected signal detectorLAnd the characteristic impedance Z0Difference value Z ofDifference (D)Calculating the position of the touch object in the second direction of the touch screen by the time delay when the time delay is larger than the preset value, so as to obtain the coordinate position (X, Y) of the touch object on the touch screen; and X is the position of the touch object in the second direction of the touch screen, and Y is the preset position of the conducting wire in the first direction of the touch screen.
The position of the touch object in the second direction of the touch screen is calculated through the following distance calculation formula:
wherein X is the position of the touch object in the second direction of the touch screen, T is the time delay, erAnd C is the speed of light transmission.
After the coordinate position (X, Y) of the touch object on the touch screen is obtained, the response event can be set in advance.
The working principle and process of the touch screen response method based on the user input pressure according to the embodiment of the present invention are described in detail below. First, a TDR scanning touch screen to which the touch screen response method of the embodiment of the present invention is applied is described.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a touch screen of a TDR scanning type suitable for implementing a touch screen response method based on user input pressure according to an embodiment of the present invention. The TDR scanning touch screen comprises a touch area 1 and a plurality of parallel mutually independent conducting wires 2 distributed in the touch area 1. Each of the conductive wires 2 is a transparent conductive wire 2, and the distance between each of the conductive wires 2 and the adjacent conductive wire is equal.
It can be understood that, the distance between two adjacent parallel wires 2 is set according to actual requirements, and the smaller the distance between two adjacent parallel wires 2 is, the larger the calculation amount is, the higher the calculation accuracy is, and the more accurate the touch control is. In a coordinate system constructed on the touch area 1, each conductive wire 2 is arranged to correspond to a coordinate position in a first direction (for example, Y coordinate direction) of the touch area 1, and each conductive wire 2 extends in parallel along a second direction (for example, X coordinate direction) of the touch area 1, so that a corresponding touch position can be obtained by calculating an X coordinate of a position where an impedance change occurs on each conductive wire.
Specifically, referring to fig. 3, fig. 3 is a schematic cross-sectional structure diagram of a touch screen in the preferred embodiment, and the TDR scanning touch screen in the present embodiment includes a substrate 10, a plurality of parallel and independent conductive lines 2 disposed on the substrate 10, and an insulating layer 3 covering the conductive lines 2, wherein the plurality of parallel and independent conductive lines 2 are distributed on the entire touch area 1, the substrate 10 may be a glass substrate, the conductive lines 2 may be made of a transparent and conductive material, such as Indium Tin Oxide (ITO), for short, and the insulating layer 3 may be a silicon dioxide film or a PET film, the TDR scanning touch screen in the present embodiment is formed by plating a plurality of parallel and independent conductive lines 2 on a transparent thin film (substrate), covering the surface of the conductive lines 2 with a silicon dioxide film or a PET film, and then placing the obtained TDR scanning touch screen on a display screen (e.g., L CD, L ED, or O L ED, etc.), so as to adapt to different display screens, and thus being used for various touch operations.
It can be understood that the TDR scanning touch screen of the present embodiment may also not include the substrate 10, but is formed by directly plating a plurality of parallel and mutually independent wires 2 on the display screen in a film plating manner and covering the surface of the wires 2 with the insulating layer 3, so as to further reduce the thickness of the touch screen and meet the requirement of the ultra-thin touch screen.
Referring to fig. 4, fig. 4 is a circuit connection block diagram of the touch screen in the present embodiment. In this embodiment, the TDR scanning touch screen further includes a signal emitter 4, a reflected signal detector 5, and a scanning driving circuit 6. Referring to fig. 2, the input end 21 of each wire 2 is connected to the signal emitter 4 and the reflected signal detector 5, respectively, the signal emitter 4 is responsible for emitting the step signal 101 to the input end 21 of the wire 2, and the reflected signal detector 5 is responsible for receiving the reflected signal 102 from the input end 21 of the wire 2.
The scanning driving circuit 6 is connected with the signal emitter 4, and the scanning driving circuit 6 drives the signal emitter 4 to switch the conducting wire 2 to emit the step signal 101 in sequence.
The output end 22 of each wire 2 is connected with one end of the load 7, and the other end of the load 7 is grounded. In addition, in the specific implementation, based on the structural principle of the TDR scanning touch screen provided by the present invention, the output end of each conducting wire 2 may be suspended without a load 7, and the above improvement is also within the protection scope of the present invention. According to the TDR principle, in the TDR scanning touch screen of the present embodiment, the output terminal 22 of each wire 2 has no signal emission when terminated (connected to the load 7) with its characteristic impedance, and has a positive signal emission with an amplitude approximately equal to the generated pulse when the output terminal 22 is not terminated (floating). The load 7 connected to the output terminal 22 of each of the wires 2 of the present embodiment has a resistance substantially equal to the characteristic impedance of each of the wires 2.
It is understood that, in the present embodiment, the input end 21 of each conducting wire 2 can be individually connected with (unique) one signal emitter 4 and one reflected signal detector 5, and each signal emitter 4 is connected with the scan driving circuit 6, and each signal emitter 4 is sequentially driven and controlled by the scan driving circuit 6 to emit the step signal 101 to the corresponding connected conducting wire 2, and each reflected signal detector 5 receives the reflected signal 102 of the corresponding connected conducting wire.
In addition, in order to reduce the equipment cost, the input end 21 of each wire 2 of the present embodiment may also be commonly connected (share) with one signal emitter 4 and one reflected signal detector 5, the scanning driving circuit 6 is used to drive and control this signal emitter 4 to sequentially switch to emit the step signal 101 to the wire 2, and the reflected signal detector 5 sequentially receives the reflected signal 102 of the corresponding wire.
Referring to fig. 5, fig. 5 is an impedance equivalent model diagram of each conductive wire 2, and each conductive wire 2 can be represented as a cascade transmission line of each equivalent network segment, and can be equivalent to a combination of T-type networks formed by lumped elements such as distributed resistance R, distributed inductance L, distributed conductance G and distributed capacitance C, and for the lossless conductive wire 2, the values of the distributed resistance R and the distributed conductance G are both zero.
Taking a T-type network as an example, the relation between the characteristic impedance Z and the distributed resistance R, the distributed inductance L, the distributed conductance G and the distributed capacitance C is expressed by the following two formulas:
equation 1:
equation 2:
where U is the voltage applied across the wire and I is the current through the wire, the characteristic impedance can be derived from the two equations
For a lossless conductor: characteristic impedance
Referring to fig. 6, fig. 6 is a schematic view of a touch object contacting a touch screen. When a touch object touches, the touch object contacts with the surface of the insulating layer 3, the touch object is used as a conductor, a capacitance is formed between the conductor and the insulating layer 3, the distributed capacitance C of the conducting wire 2 is changed, and then the conducting wire 2 generates impedance change at the touch point 8. The impedance change causes a portion of the signal, referred to herein as the reflected signal 102, to be reflected back to the input end of the wire.
Here, the impedance of the conductor 2 with no load at the output terminal 22 will be described as an example: as shown in fig. 7, 8 and 9, fig. 7, 8 and 9 are impedance-timing graphs in three cases of no touch point, touch point 8A and touch point 8B of any one of the wires 2, respectively. In fig. 7, a curve 111 is an impedance curve of the input terminal 21, a curve 112 is an impedance curve of the conductive line 2, and a curve 113 is an impedance curve of the output terminal 22 in the air. For the contact point 8A and the contact point 8B at different positions of the same wire 2, a curve 114 in fig. 8 is a curve of the change in the induced impedance by the touch point 8A, and a curve 115 in fig. 9 is a curve of the change in the induced impedance by the touch point 8B. The touch position on the same conductor 2 differs, and the time point on the impedance characteristic curve at which the impedance change is caused differs.
In the specific implementation, the input ends 21 of the plurality of parallel wires 2 sequentially complete the input of the step signal 101 by the signal emitter 4 and the reception of the reflected signal 102 by the reflected signal detector 5, and the switching of the wires 2 is completed by the scan driving circuit 6.
Next, with reference to fig. 2 and fig. 10, how to implement a touch screen response method based on user input pressure and an implementation principle and an operation process of touch location by using the TDR scanning touch screen of the present embodiment are described in detail. Referring to fig. 2, a first direction and a second direction of the TDR scanning touch screen employed in the present embodiment are perpendicular to each other; wherein, the first direction is set as Y-axis direction, and the second direction is set as X-axis direction.
First, the position of each wire 2 in the Y axis direction is preset, each wire 2 is preset in the order from left to right as Y, Y +1, Y +2 … … Y + n, and each wire 2 extends in parallel in the X axis direction.
Then, the signal emitter 4 is driven by the scanning driving circuit 6 to sequentially emit step signals 101 to the input end 21 of each wire 2 line by line along the Y-axis direction according to a preset period. While the reflected signal 102 at the input end 21 of each wire 2 is correspondingly received in turn by the reflected signal detector 5.
Referring to fig. 10, fig. 10 is a graph of the waveform of the injection signal at the input terminal 21 of the conductor 2, the injection signal including the transmission signal 101 and the reflection signal 102, and the graph shows the relationship of voltage amplitude versus time sequence. As can be seen from fig. 10, the voltage amplitude of the reflected signal is related to the load impedance of the conductor 2.
Specifically, the reflected signal detector 5 determines whether the received reflected signal 102 is the reflected signal 102 generated by the impedance change caused by the normal touch of the touching object by the following steps:
first, the reflection coefficient ρ of the reflection signal 102 received by the reflection signal detector 5 to the wire 2 is calculated by the following formula (b):
wherein, ViAmplitude, V, of step signal 101 transmitted to conductor 2 by signal transmitter 4rThe reflected signal 102 amplitude of the wire 2 is received for the reflected signal detector 5.
Then, the load impedance Z of the reflected signal 102 is calculated by the following formula (a)L：
Wherein Z is0Is the characteristic impedance of the wire 2.
The calculated load impedance ZLAnd a characteristic impedance Z0Comparing when the load impedance Z isLAnd characteristic impedance Z0If the difference is greater than the preset value, it is determined that the difference between the reflected signal 102 and the preset reference signal is greater than the preset threshold. This step is to determine the reflected signal 102 as a reflected signal 102 generated by a normal touch-induced impedance change of the touching object.
When it is determined that the reflected signal 102 received from the wire 2 is the reflected signal 102 generated by the impedance change caused by the normal touch of the touching object, the corresponding response event can be executed based on the touch pressure of the user and/or based on the touch position of the user, and the specific process is as follows:
performing a corresponding response event based on a touch pressure of a user
When the load impedance ZLAnd the characteristic impedance Z0Difference value Z ofDifference (D)When greater than a predetermined value, according to ZDifference (D)The size of the corresponding event and a preset mapping table are executed; wherein, Z is recorded in the mapping tableDifference (D)The correspondence between the size and the response event.
According to the above, when a user touches the insulating surface of the corresponding wire on the touch screen, the wire generates impedance change at the touch point, and the specific impedance value becomes larger or smaller according to the structure of the wire. However, in any structured wire, the larger the pressure of the user touch, the larger (larger or smaller) the impedance change of the wire at the touch point. Based on this principle, therefore, the correspondence relationship between the impedance change value and the response event is recorded by a mapping table (lookup table) set in advance. When calculating the load impedance Z of the conductor 2LAnd the characteristic impedance Z0Difference value Z ofDifference (D)When the difference value is larger than the preset value, the difference value Z can be searched according to a preset mapping tableDifference (D)(i.e., the impedance change value) to a corresponding response event, and thereby executing the response event.
(II) executing corresponding response event based on touch position of user
The position of the touch point 8 is located in the next step according to the reflected signal 102. The method specifically comprises the following steps:
acquiring the time delay T from the transmission of the step signal 101 to the input end 21 of the wire 2 where the reflection signal 102 is generated by the signal transmitter 4 to the reception of the transmission signal 102, and calculating the position of the touch point 8 in the X-axis direction of the wire 2 according to the following distance calculation formula (c):
where D is the position of the touch point in the X-axis direction, erAnd C is the speed of light transmission.
The resultant position D is converted into an X coordinate, and a position coordinate point (X, Y) of the touch point 8 is determined in conjunction with a Y coordinate in the Y axis direction of the wire 2 on which the reflected signal 102 is located. The system can make a corresponding touch reaction according to the position of the touch point 8.
In specific implementation, under the driving control of the scanning driving circuit 6, the signal emitter 4 emits step signals 101 to the input end 21 of each conducting wire 2 row by row, and the reflected signal detector 5 detects the reflected signal 102 corresponding to the input end 21 of the conducting wire 2.
When a touch object touches the touch screen, the impedance of the lead 2 at the point of the touch point 8 changes; the reflected signal detector 5 receives the reflected signal 102 caused by the touch point 8; by calculating the load impedance Z of the reflected signal 102LWhen the load impedance ZLAnd a predetermined characteristic impedance Z0When the difference value exceeds a preset value, calculating the position of the touch point 8; calculating an X coordinate through a time delay T from inputting the step signal 101 to detecting the reflection signal 102 by the wire 2 where the reflection signal 102 is positioned, determining a Y coordinate by combining the position of the wire 2 where the reflection signal 102 is positioned, and obtaining the position of the touch point 8 from coordinate points (X, Y), thereby realizing the touch function of the whole touch screen,
in this embodiment, the scanning mode adopted by the touch screen is as follows: the signal emitter 4 is driven by the scan driving circuit 6 to emit step signals 102 to the input terminal 21 of each conductor 2 line by line in the Y-axis direction.
In addition, on the premise of not departing from the principle of the present invention, in the implementation process, the scanning driving circuit 6 in the touch screen provided by the present invention drives the signal emitter 4 to sequentially emit the step signal 101 to the input end 21 of each conducting wire 2, which can also be implemented by the following scanning modes:
firstly, a scanning driving circuit 6 drives a signal emitter 4 to emit step signals 101 to input ends 21 of each conducting wire 2 in odd rows line by line along the Y-axis direction of the touch screen; and then the scanning driving circuit 6 drives the signal emitter 4 to emit step signals 101 to the input end 21 of each conducting wire 2 positioned in the even-numbered rows line by line along the Y-axis direction of the touch screen.
Therefore, the touch screen response method based on the user input pressure is based on a plurality of parallel and mutually independent conducting wires distributed on a TDR scanning type touch screen, the signal emitter, the reflected signal detector and the scanning driving circuit are used for obtaining the reflected signal of each conducting wire, the impedance change of the reflected signal of each conducting wire is obtained through calculation, the impedance change is larger according to the larger pressure, the corresponding response event can be executed according to a preset mapping table for recording the corresponding relation between the impedance change and the response event, the response event can be realized according to the touch pressure of a user under the condition of no need of an additional pressure sensor, the manufacturing process is simple, and the cost is effectively saved.
Referring to fig. 11a, this embodiment provides a touch screen response device based on user input pressure, where the touch screen response device is suitable for a TDR scanning touch screen, where the TDR scanning touch screen includes a touch area and a plurality of parallel and independent wires disposed in the touch area, an input end of each wire is connected to a signal emitter and a reflected signal detector, respectively, and the signal emitter is connected to a scanning driving circuit; the touch screen response device comprises:
the reflected signal receiving module 111 is configured to drive the signal emitter to sequentially emit step signals to the input end of each conducting wire through the scanning driving circuit, and receive the reflected signals of the input end of each conducting wire sequentially and correspondingly received by the reflected signal detector;
a load impedance calculating module 112, configured to calculate a load impedance Z of the reflected signal received by the reflected signal detector to each of the wiresL；
Specifically, the load impedance calculating module 112 calculates the load impedance of the reflected signal of each wire received by the reflected signal detector according to the following formula:
wherein Z isLIs the load impedance, Z, of the reflected signal of the wire when the reflected signal detector receives the reflected signal of the wire0P is a reflection coefficient, which is a preset characteristic impedance of the lead; the reflection coefficient ρ is calculated by the following formula:
wherein, ViAmplitude, V, of step signal transmitted to said conductor for said signal transmitterrThe amplitude of the reflected signal of the wire received by the reflected signal detector;
a response module 113 for determining the load impedance ZLAnd the characteristic impedance Z0Difference value Z ofDifference (D)When greater than a predetermined value, according to ZDifference (D)The size of the corresponding event and a preset mapping table are executed; wherein, Z is recorded in the mapping tableDifference (D)The correspondence between the size and the response event.
In another embodiment, as shown in fig. 11b, in addition to detecting the pressure of the touch of the user in real time to respond to the event according to the magnitude of the touch pressure of the user, the embodiment can also detect the touch position of the user in real time, so as to combine the touch position and the touch pressure to complete the corresponding response event at the same time, and the embodiment further includes, on the basis of fig. 11 a:
a touch point calculation module 114 for calculating the touch point when the load impedance Z is lower than the predetermined valueLAnd the characteristic impedance Z0Difference value Z ofDifference (D)When the load impedance is larger than the preset value, the step signal is transmitted to the wire by the signal transmitter until the reflected signal of the wire is received by the reflected signal detectorLAnd the characteristic impedance Z0Difference value Z ofDifference (D)Calculating the position of the touch object in the second direction of the touch screen by the time delay when the time delay is larger than the preset value, so as to obtain the coordinate position (X, Y) of the touch object on the touch screen; and X is the position of the touch object in the second direction of the touch screen, and Y is the preset position of the conducting wire in the first direction of the touch screen.
After the coordinate position (X, Y) of the touch object on the touch screen is obtained, the response event can be set in advance.
The touch point calculation module 114 is further configured to: and calculating the position of the touch object in the second direction of the touch screen by the following distance calculation formula:
wherein X is the position of the touch object in the second direction of the touch screen, T is the time delay, erAnd C is the speed of light transmission.
Wherein the first direction is a Y-axis direction, and the second direction is an X-axis direction; or, the first direction is an X-axis direction, and the second direction is a Y-axis direction.
For a specific working principle and a specific process of the touch screen response device based on the user input pressure shown in fig. 11a and 11b, please refer to the above related touch screen response method embodiment based on the user input pressure, which is not described herein again.
In summary, the touch screen response device based on the user input pressure provided by the invention is based on a plurality of parallel and mutually independent wires distributed on the TDR scanning type touch screen, obtains the reflected signal of each wire by using the signal emitter, the reflected signal detector and the scanning driving circuit, obtains the impedance change of the reflected signal of each wire through calculation, and executes the corresponding response event according to the preset mapping table for recording the corresponding relation between the impedance change and the response event according to the principle that the impedance change is larger when the pressure is larger, so that the response event can be realized according to the touch pressure of the user without an additional pressure sensor, the manufacturing process is simple, and the cost is effectively saved.
The foregoing is directed to the preferred embodiment of the present invention, and it is understood that various changes and modifications may be made by one skilled in the art without departing from the spirit of the invention, and it is intended that such changes and modifications be considered as within the scope of the invention.
Claims (10)
1. A touch screen response method based on user input pressure is characterized by being suitable for a TDR scanning type touch screen, wherein the TDR scanning type touch screen comprises a touch area and a plurality of parallel and independent leads arranged in the touch area, the input end of each lead is respectively connected with a signal emitter and a reflected signal detector, and the signal emitter is connected with a scanning driving circuit; the touch screen response method comprises the following steps:
s1, driving the signal emitter to sequentially emit step signals to the input end of each lead by the scanning driving circuit, and receiving the reflected signals of the input end of each lead correspondingly and sequentially received by the reflected signal detector;
s2, calculating the load impedance Z of the reflected signal of each wire received by the reflected signal detectorL；
S3, when the load impedance Z isLWith a predetermined characteristic impedance Z of the corresponding wire0Difference value Z ofDifference (D)When greater than a predetermined value, according to ZDifference (D)The size of the corresponding event and a preset mapping table are executed; wherein, Z is recorded in the mapping tableDifference (D)The corresponding relation between the magnitude and the response event, and the larger the input pressure of the user, the corresponding ZDifference (D)The larger.
2. The touch screen response method according to claim 1, wherein the step S2 specifically includes:
calculating the load impedance of the reflected signal of each wire received by the reflected signal detector according to the following formula:
wherein Z isLIs the load impedance, Z, of the reflected signal of the wire when the reflected signal detector receives the reflected signal of the wire0P is a reflection coefficient, which is a preset characteristic impedance of the lead; the reflection coefficient ρ is calculated by the following formula:
wherein, ViIs that it isAmplitude, V, of step signal emitted by signal emitter to said conductorrThe amplitude of the reflected signal of the wire received by the reflected signal detector.
3. The touch screen response method of claim 1, further comprising the steps of:
s4, when the load impedance Z isLAnd the characteristic impedance Z0Difference value Z ofDifference (D)When the load impedance is larger than the preset value, the load impedance Z of the reflected signal of the lead received by the reflected signal detector is reached according to the fact that the signal emitter starts to emit step signals to the leadLAnd the characteristic impedance Z0Difference value Z ofDifference (D)Calculating the position of the touch object in the second direction of the touch screen by the time delay when the time delay is larger than the preset value, so as to obtain the coordinate position (X, Y) of the touch object on the touch screen; and X is the position of the touch object in the second direction of the touch screen, and Y is the preset position of the conducting wire in the first direction of the touch screen.
4. The touch screen response method of claim 3, wherein the position of the touch object in the second direction of the touch screen is calculated by the following distance calculation formula:
wherein X is the position of the touch object in the second direction of the touch screen, T is the time delay, erAnd C is the speed of light transmission.
5. The touch screen response method according to claim 1, wherein the driving, by the scan driving circuit, the signal emitters to sequentially emit step signals to the input end of each of the conductive lines comprises:
the scanning driving circuit drives the signal emitter to emit step signals to the input end of each conducting wire line by line along a first direction of the touch screen; or
Firstly, the scanning driving circuit drives the signal emitters to emit step signals to the input end of each conducting wire in an odd-numbered line row by row along a first direction of the touch screen; and driving the signal emitters to emit step signals to the input ends of the leads positioned on the even-numbered rows line by line along the first direction of the touch screen through the scanning driving circuit.
6. A touch screen response method according to claim 3, wherein the first direction is a Y-axis direction and the second direction is an X-axis direction; or, the first direction is an X-axis direction, and the second direction is a Y-axis direction.
7. A touch screen response device based on user input pressure is characterized by being suitable for a TDR scanning type touch screen, wherein the TDR scanning type touch screen comprises a touch area and a plurality of parallel and independent leads arranged in the touch area, the input end of each lead is respectively connected with a signal emitter and a reflected signal detector, and the signal emitter is connected with a scanning driving circuit; the touch screen response device comprises:
the reflected signal receiving module is used for driving the signal emitter to sequentially emit step signals to the input end of each lead by the scanning driving circuit and receiving the reflected signals of the input end of each lead sequentially and correspondingly received by the reflected signal detector;
a load impedance calculation module for calculating the load impedance Z of the reflected signal of each wire received by the reflected signal detectorL(ii) a A response module for measuring the load impedance ZLWith a predetermined characteristic impedance Z of the corresponding wire0Difference value Z ofDifference (D)When greater than a predetermined value, according to ZDifference (D)The size of the corresponding event and a preset mapping table are executed; wherein, Z is recorded in the mapping tableDifference (D)The corresponding relation between the magnitude and the response event, and the larger the input pressure of the user, the corresponding ZDifference (D)The larger.
8. The touch screen response device of claim 7, wherein the load impedance calculation module is further configured to calculate the load impedance of the reflected signal received by the reflected signal detector to each of the conductive lines according to the following formula:
wherein Z isLIs the load impedance, Z, of the reflected signal of the wire when the reflected signal detector receives the reflected signal of the wire0P is a reflection coefficient, which is a preset characteristic impedance of the lead; the reflection coefficient ρ is calculated by the following formula:
wherein, ViAmplitude, V, of step signal transmitted to said conductor for said signal transmitterrThe amplitude of the reflected signal of the wire received by the reflected signal detector.
9. The touch screen response apparatus of claim 7, further comprising:
a touch point calculation module for calculating the touch point when the load impedance Z isLAnd the characteristic impedance Z0Difference value Z ofDifference (D)When the load impedance is larger than the preset value, the step signal is transmitted to the wire by the signal transmitter, and the load impedance Z of the reflected signal of the wire is received by the reflected signal detectorLAnd the characteristic impedance Z0Difference value Z ofDifference (D)Calculating the position of the touch object in the second direction of the touch screen by the time delay when the time delay is larger than the preset value, so as to obtain the coordinate position (X, Y) of the touch object on the touch screen; and X is the position of the touch object in the second direction of the touch screen, and Y is the preset position of the conducting wire in the first direction of the touch screen.
10. The touch screen response apparatus of claim 9, wherein the touch point calculation module is further configured to: and calculating the position of the touch object in the second direction of the touch screen by the following distance calculation formula:
wherein X is the position of the touch object in the second direction of the touch screen, T is the time delay, erAnd C is the speed of light transmission.
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| CN103226408A (en) * | 2012-01-25 | 2013-07-31 | 株式会社日本显示器西 | Detector, detection method and display device |
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| US8736582B2 (en) * | 2009-11-29 | 2014-05-27 | Kihong (Joshua) Kim | Time domain reflectometer touch screen sensor |
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| US5149918A (en) * | 1990-10-29 | 1992-09-22 | International Business Machines Corporation | Touch sensitive overlay |
| CN101395560A (en) * | 2006-03-29 | 2009-03-25 | 日本电气株式会社 | Inputting apparatus and inputting method |
| CN102782620A (en) * | 2010-04-30 | 2012-11-14 | 密克罗奇普技术公司 | Touch sense using time domain reflectometry |
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