WO2016045245A1 - 触摸屏及触摸点定位方法 - Google Patents

触摸屏及触摸点定位方法 Download PDF

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Publication number
WO2016045245A1
WO2016045245A1 PCT/CN2015/070111 CN2015070111W WO2016045245A1 WO 2016045245 A1 WO2016045245 A1 WO 2016045245A1 CN 2015070111 W CN2015070111 W CN 2015070111W WO 2016045245 A1 WO2016045245 A1 WO 2016045245A1
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WO
WIPO (PCT)
Prior art keywords
receiving
unit
touch point
display panel
timing
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PCT/CN2015/070111
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English (en)
French (fr)
Inventor
沙金
Original Assignee
京东方科技集团股份有限公司
合肥鑫晟光电科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 京东方科技集团股份有限公司, 合肥鑫晟光电科技有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US14/646,088 priority Critical patent/US9817522B2/en
Priority to EP15720251.6A priority patent/EP3200050B1/en
Publication of WO2016045245A1 publication Critical patent/WO2016045245A1/zh

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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
    • G06F3/043—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using propagating acoustic waves
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/26—Power supply means, e.g. regulation thereof
    • G06F1/32—Means for saving power
    • G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
    • G06F1/3234—Power saving characterised by the action undertaken
    • G06F1/325—Power saving in peripheral device
    • G06F1/3262—Power saving in digitizer or tablet
    • 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
    • G06F3/0412—Digitisers structurally integrated in a display
    • 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
    • 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
    • G06F3/043—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using propagating acoustic waves
    • G06F3/0436—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using propagating acoustic waves in which generating transducers and detecting transducers are attached to a single acoustic waves transmission substrate

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a touch screen and a touch point positioning method.
  • the surface acoustic wave type touch screen has become the mainstream touch screen due to its high resolution, short response time, good stability, good riot resistance and good light transmission.
  • the surface acoustic wave type touch screen comprises two transmitting transducers, two receiving transducers and two sets of reflective stripe arrays, and the sound wave generator emits a high frequency sound wave capable of crossing the surface of the touch screen through the transmitting transducer.
  • the high frequency sound wave is blocked at the touch point, thereby determining the coordinate position of the touch point.
  • the surface acoustic wave type touch screen of the prior art has the following drawbacks: 1.
  • the two sets of reflective stripe arrays greatly affect the display effect of the touch screen during display; 2.
  • the two transmit transducers continuously High-frequency sound waves are emitted, resulting in a higher overall power consumption of the touch screen.
  • the invention provides a touch screen and a touch point positioning method, which can effectively position a touch point on a display panel.
  • the present invention provides a touch screen including a display panel and a touch point positioning device, the touch point positioning device including a timing unit, a calculation unit, and n receiving units, n ⁇ 3, wherein: the receiving a unit is disposed in an edge region of the display panel, the receiving unit is connected to the timing unit, the timing unit is connected to the computing unit, and the receiving unit is configured to receive a touch point when the display panel is touched a sound wave signal generated at a position; the timing unit is configured to record a receiving moment when each of the receiving units receives the sound wave signal; and the calculating unit is configured to receive a receiving time of each of the receiving units according to the timekeeping unit Calculating the touch point on the display surface Position coordinates on the board.
  • the timing unit is turned on when any one of the receiving units receives the sound wave signal, and is turned off when all the receiving units receive the sound wave signal, and A receiving time corresponding to a receiving unit that receives the sound wave signal is recorded as an initial time.
  • the positioning device further includes a counting unit, the counting unit is connected to the timing unit and each of the receiving units, and the counting unit is configured to receive the receiving unit of the sound wave signal Counting, when the count value in the counting unit is 1, the counting unit generates and sends a timing on signal to the timing unit, and when the count value in the counting unit is n, the counting The unit generates and sends a timing off signal to the timing unit, and the counting unit resets the counting value, the timing unit is turned on when receiving the timing on signal, and receives the timing off signal Closed when.
  • the touch point positioning device further includes a storage unit, the storage unit is connected to the computing unit, and the storage unit is configured to pre-store position coordinates of the plurality of reference positions on the display panel and the a receiving moment corresponding to each receiving unit when the reference position is touched,
  • the calculating unit includes a time coordinate generating module and a calculating module, wherein the time coordinate generating module is connected to the calculating module, and the time coordinate generating module is configured to use the a receiving time of each of the receiving units recorded by the timing unit and generating corresponding receiving time coordinates of the touch point in the n-dimensional coordinate system according to an arrangement order of the receiving units set in advance, and according to a reference position stored in the storage unit a receiving time corresponding to each receiving unit when touched, and generating a corresponding receiving time coordinate of the reference position in an n-dimensional coordinate system according to the arrangement order of the receiving unit set in advance, the calculating module being used for n-dimensional According to the receiving time coordinates of the touch point and the receiving time of each reference position in
  • the receiving unit is a piezoelectric sensor, and the piezoelectric sensor is used in Generating a corresponding electrical signal when the acoustic signal is received, and transmitting the electrical signal to the timing unit, the timing unit sequentially receiving an electrical signal generated by each of the piezoelectric sensors, and according to the received The electrical signal records each of the receiving units to receive a receiving moment corresponding to the acoustic signal.
  • the number of the receiving units is three, and the three receiving units are not located on the same straight line.
  • the number of the receiving units is four, the shape of the display panel is a rectangle, and the four receiving units are respectively located at a midpoint of four sides of the display panel.
  • the present invention also provides a touch point positioning method of a touch screen, the touch screen comprising a display panel, a timing unit, a calculation unit and n receiving units, wherein n ⁇ 3, the receiving unit is disposed at the The edge area of the display panel, the receiving unit is connected to the timing unit, and the timing unit is connected to the computing unit, the touch point positioning method includes: receiving, by the receiving unit, that the display panel is touched Acoustic wave signals generated at a touch point; recording, by the timing unit, a reception time when each of the receiving units receives the sound wave signal; and calculating, by the calculation unit, the receiving time of each of the receiving units recorded by the timekeeping unit The position coordinates of the touch point on the display panel.
  • the timing unit is turned on when any one of the receiving units receives the sound wave signal, and is turned off when all the receiving units receive the sound wave signal, and A receiving time corresponding to a receiving unit that receives the sound wave signal is recorded as an initial time.
  • the touch point positioning device further includes a storage unit, the storage unit is connected to the computing unit, and the touch point positioning method is generated at the touch point when the receiving unit receives the display panel being touched
  • the step of the sound wave signal further includes: pre-storing, by the storage unit, position coordinates of the plurality of reference positions on the display panel and receiving time corresponding to each receiving unit when the reference position is touched, the calculating unit including time coordinate generation a module and a calculation module, wherein the time coordinate generation module is connected to the calculation module, and the calculation unit calculates the touch point on the display panel according to the reception time of each of the receiving units recorded by the timing unit
  • the step of the positional coordinates includes: recording by the timekeeping unit by the time coordinate generation module a receiving time of each of the receiving units and generating corresponding receiving time coordinates of the touch point in an n-dimensional coordinate system according to an arrangement order of the receiving units set in advance, and each being touched according to a reference position stored in the storage unit a receiving time corresponding to the receiving unit and generating a
  • the invention provides a touch screen and a touch point positioning method
  • the touch screen comprises a timing unit, a calculation unit and n receiving units, wherein the receiving unit is arranged in an edge region of the display panel, the receiving unit is connected with the timing unit, the timing unit and the calculation Unit connection.
  • the technical solution of the present invention receives the sound wave signal generated at the touch point when the display panel is touched by the receiving unit, and the timing unit records the receiving time when each receiving unit receives the sound wave signal, and uses the calculating unit to record each receiving unit according to the timing unit.
  • the receiving time is used to calculate the position coordinates of the touch point on the display panel, thereby realizing the positioning of the touch point.
  • the overall power consumption of the touch screen is low, and its application range is wide.
  • FIG. 1 is a schematic structural view of a touch point positioning device of a touch screen in a first embodiment of the present invention.
  • FIG. 2 is a schematic diagram of a touch point positioning of a touch screen in a first embodiment of the present invention.
  • FIG. 3 is a flowchart of a method for positioning a touch point of a touch screen according to a second embodiment of the present invention.
  • FIG. 1 is a schematic structural diagram of a touch point positioning device of a touch screen in a first embodiment of the present invention
  • FIG. 2 is a schematic diagram of a touch point positioning of the touch screen in the first embodiment of the present invention. As shown in FIG. 1 and FIG.
  • the touch screen includes a display panel 7 and a touch point positioning device
  • the touch point positioning device includes a timing unit 2, a calculation unit 3, and n receiving units 1, wherein n ⁇ 3, the receiving unit 1 Provided in an edge region of the display panel 7, the receiving unit 1 is connected to the timing unit 2, and the timing unit 2 is connected to the computing unit 3, and the receiving unit 1 is configured to receive a sound wave signal generated at the touched point 9 when the display panel 7 is touched, timing The unit 2 is for recording the reception timing when the respective receiving unit 1 receives the acoustic wave signal, and the calculation unit 3 is for calculating the position coordinates of the touched point 9 on the display panel 7 based on the reception timings of the respective receiving units 1 recorded by the timing unit 2.
  • the timing unit 2 is turned on when any one of the receiving units 1 receives the sound wave signal, and is turned off when all the receiving units 1 receive the sound wave signal.
  • the touch point positioning device further includes a counting unit 10, which is connected to the timing unit 2 and each of the receiving units 1.
  • the counting unit 10 is for counting the number of receiving units 1 that have received the acoustic signal. When the count value in the counting unit 10 is 1, the counting unit 10 generates and transmits a timing ON signal to the timing unit 2. When the count value in the counting unit 10 is n, the counting unit 10 generates and transmits a timing off signal to the timing unit 2, and the counting unit 10 resets the count value.
  • the timing unit 2 is turned on when receiving the timing on signal, and is turned off when the timing off signal is received.
  • the timing unit 2 takes the first receiving time corresponding to the receiving unit 1 that receives the acoustic signal as the initial time during the counting process, and assumes that the initial time is 0 in the present embodiment, and then sequentially records that the other receiving unit 1 receives the acoustic signal. The moment of reception.
  • the touch point positioning device further includes a storage unit 4 connected to the calculation unit 3, and the storage unit 4 is configured to pre-store the position coordinates of the plurality of reference positions 8 on the display panel 7 and when the reference position 8 is touched.
  • the receiving time corresponding to each receiving unit 1.
  • the receiving unit 1 is a piezoelectric sensor, and the piezoelectric sensor is configured to generate a corresponding electrical signal when the acoustic signal is received, and send the electrical signal to the timing unit. 2.
  • the timing unit 2 sequentially receives the electrical signals generated by the respective piezoelectric sensors, and records the corresponding receiving moments when the receiving signals are received by the respective receiving units 1 according to the received electrical signals.
  • the piezoelectric sensor since the piezoelectric sensor has the characteristics of simple structure, small volume, and small mass, it can be conveniently mounted on the edge region of the display panel 7. In addition, since the piezoelectric sensor has a feature of low power consumption, the overall power consumption of the touch screen can be reduced.
  • the calculation unit 3 includes a time coordinate generation module 5 and a calculation module 6, and the time coordinate generation module 5 is connected to the calculation module 6.
  • the time coordinate generation module 5 is configured to generate corresponding reception time coordinates of the touch point 9 in the n-dimensional coordinate system according to the reception time of each receiving unit 1 recorded by the timing unit 2, and are touched according to the reference position 8 stored in the storage unit 4. At the reception time corresponding to each receiving unit 1, the corresponding receiving time coordinates of the reference position 8 in the n-dimensional coordinate system are generated.
  • the calculation module 6 is configured to calculate the Euclidean distance between each reference position 8 and the touch point 9 according to the reception time coordinates of the touch point 9 and the reception time coordinates of the respective reference positions 8 in the n-dimensional coordinate system, and The reference position 8 having the smallest Euclide distance from the touch point 9 is determined, so that the position coordinates of the touch point 9 on the display panel 7 are determined to correspond to the reference position 8 having the smallest Euclide distance from the touch point 9. Position coordinates.
  • the touch screen in this embodiment will be described in detail below with reference to the accompanying drawings.
  • the number of receiving units is four
  • the shape of the display panel 7 is rectangular
  • the four receiving units 1a, 1b, 1c, 1d are respectively located at the midpoints of the four sides of the display panel 7.
  • the storage unit 4 stores in advance the position coordinates of the plurality of reference positions 8 on the display panel 7 (coordinates of the real position reflected on the display panel 7) and the reception of the respective receiving units 1a, 1b, 1c, 1d when the reference position 8 is touched At this time, the pre-stored process of the storage unit 4 will be described in detail below.
  • the display panel 7 is divided into a plurality of meshes in advance, and the intersection of the grid lines is used as the reference position 8, and the position coordinates corresponding to the respective reference positions 8 are recorded.
  • the selection of the reference position 8 in the present invention is not limited to the above-described mesh division method, and the reference position 8 in the present invention may be an arbitrary position on the display panel 7.
  • the reference position 8 is touched by a touch device (for example, a finger, a stylus, etc.), and an acoustic wave signal is generated at the touched reference position 8 at this time, and the acoustic wave signal is respectively transmitted to the four disposed at the edge of the display panel 7.
  • Receiving units 1a, 1b, 1c, 1d The timing unit 2 is turned on when any one of the receiving units 1a, 1b, 1c, or 1d receives the sound wave signal, and the receiving time corresponding to the receiving unit that receives the first sound wave signal is received.
  • the record is 0, and then the receiving moments corresponding to the received acoustic signals are received in sequence by the remaining receiving units.
  • the time coordinate generation module 5 is based on the reception timings of the respective reception units 1a, 1b, 1c, and 1d recorded by the timing unit 2, and in accordance with the arrangement order of the reception units set in advance (assuming that the arrangement order of the four reception units is sequentially
  • the receiving unit 1a, the receiving unit 1b, the receiving unit 1c, and the receiving unit 1d) generate the receiving time coordinates (X1, X2, X3, X4) corresponding to the reference position 8 in the four-dimensional coordinate system.
  • X1 is the reception time corresponding to the reception unit 1a when the reference position 8 is touched
  • X2 is the reception time corresponding to the reception unit 1b when the reference position 8 is touched
  • X3 is the reception time corresponding to the reception unit 1c when the reference position 8 is touched
  • X4 is the reception time corresponding to the receiving unit 1d when the reference position 8 is touched.
  • the corresponding n-dimensional coordinate system is a four-dimensional coordinate system.
  • the position coordinates and the receiving time coordinates corresponding to the respective reference positions 8 on the display panel 7 are acquired by the above method, and stored in the storage unit 4, and the pre-storage process of the storage unit 4 ends.
  • the position acts as a touch point 9, at which an acoustic wave signal will be generated, which will be transmitted to the four disposed at the edge of the display panel 7, respectively.
  • the counting unit 10 counts the number of receiving units that have received the acoustic signal. Specifically, when the receiving unit receives the acoustic signal, a corresponding electrical signal is generated, and the receiving unit transmits the electrical signal to the counting unit 10 while transmitting the electrical signal to the timing unit 2, and the counting unit 10 calculates the received power by calculating the received signal.
  • the number of signals is used to count the number of receiving units that receive the acoustic signals.
  • the counting unit 10 When all of the receiving units 1a, 1b, 1c, 1d When a receiving unit receives the acoustic signal, the count value in the counting unit 10 is 1, and the counting unit 10 generates and transmits a timing ON signal to the timing unit 2.
  • the timing unit 2 is turned on when receiving the timing on signal, and records the reception time corresponding to the receiving unit that received the first acoustic wave signal as 0, and then sequentially records the reception timings corresponding to the received acoustic signals received by the remaining receiving units.
  • the counting unit 10 When all the receiving units 1a, 1b, 1c, 1d receive the acoustic signal, the count value in the counting unit 10 is 4, the counting unit 10 generates and transmits a timing off signal to the timing unit 2, and the counting unit 10 performs the counting value. Reset.
  • the timing unit 2 is turned off when receiving the timing off signal.
  • the time coordinate generation module 5 receives the reception time corresponding to each of the receiving units 1a, 1b, 1c, and 1d recorded by the timing unit 2, and according to the arrangement order of the receiving units set in advance (the same as the arrangement order in the pre-storage process) And generating corresponding receiving time coordinates (X1′, X2′, X3′, X4′) of the touch point 9 in the four-dimensional coordinate system, wherein X1′ is corresponding to the sound wave signal generated at the touch point 9 being received by the receiving unit 1a
  • the receiving time, X2' is the receiving time corresponding to the sound wave signal generated at the touch point 9 when received by the receiving unit 1b
  • X3' is the receiving time corresponding to the sound wave signal generated at the touch point 9 when received by the receiving unit 1c
  • X4' is a reception time corresponding to when the sound wave generated at the touch point 9 is received by the receiving unit 1d.
  • calculation module 6 calculates the Euclidean distance D between each reference position 8 and the touch point 9, wherein
  • the reference position 8 having the smallest Euclidean distance from the touched point 9 is determined, and the touched point is acquired from the storage unit 4.
  • the Euclidean 9 has a position coordinate corresponding to the smallest reference position 8 and uses the position coordinate as the position coordinate of the touch point 9, and thus the touch point positioning process ends.
  • the storage unit 4 in the pre-storage process of the storage unit 4, the storage unit 4 is connected to the timing unit 2, but the storage unit 4 does not need to be connected to the timing unit 2 during the touch point positioning process.
  • the number of the receiving units 1 is four
  • the shape of the display panel 7 is rectangular
  • the four receiving units 1a, 1b, 1c, and 1d are respectively located.
  • the case of the midpoint of the four sides of the display panel 7 serves only as an exemplary function and does not limit the technical solution of the present application.
  • the number of receiving units 1 may be greater than or equal to three.
  • the number of receiving units 1 is three, the three receiving units 1 cannot be located on the same straight line (the case where the number of receiving units is three is not given the corresponding drawing).
  • the accuracy of the touch point positioning in this embodiment is related to the number and distribution of the reference positions 8 on the display panel 7, that is, the more the number of reference positions 8 or the denser the distribution of the reference position 8, the corresponding touch points. The higher the accuracy of positioning.
  • the embodiment provides a touch screen, the touch screen includes a display panel and a touch point positioning device, and the touch point positioning device includes a timing unit, a calculation unit, and n receiving units, wherein the receiving unit is disposed at an edge region of the display panel, and receives The unit is connected to the timing unit, and the timing unit is connected to the calculation unit.
  • the technical solution of the present invention receives the sound wave signal generated at the touch point when the display panel is touched by the receiving unit, and the timing unit records the receiving time when each receiving unit receives the sound wave signal, and uses the calculating unit to record each receiving unit according to the timing unit. The receiving time is used to calculate the position coordinates of the touch point on the display panel, thereby realizing the positioning of the touch point.
  • the receiving unit in the touch screen is disposed in the edge area of the display panel, the setting of the receiving unit does not affect the display effect of the display panel.
  • the receiving unit employs a piezoelectric sensor, since the piezoelectric sensor consumes extremely low power, the overall power consumption of the touch screen is not increased.
  • the timing unit in the touch screen can be turned on when any one of the receiving units receives the sound wave signal, and is turned off when all the receiving units receive the sound wave signal, thereby effectively reducing the overall power consumption of the touch screen.
  • the touch point positioning method is applied to a touch screen, and the touch screen includes a display panel and a touch point positioning device, and the touch point positioning device includes a storage unit, a timing unit, a calculation unit and n receiving units, wherein n ⁇ 3, the receiving unit is disposed in an edge region of the display panel, the storage unit is connected to the computing unit, the receiving unit is connected to the timing unit, and the timing unit is connected to the computing unit
  • the touch point positioning method includes the following steps 101 to 104.
  • Step 101 The storage unit pre-stores a position of a plurality of reference positions on the display panel. For the receiving time corresponding to each receiving unit when the reference position is touched, the process can be referred to the description in the first embodiment above, and details are not described herein.
  • Step 102 The receiving unit receives an acoustic wave signal generated at a touch point when the display panel is touched.
  • step 102 when the display panel is touched by the touch device, a corresponding acoustic wave signal is generated at the touched point, and the acoustic wave signal will be received by n receiving units disposed in an edge region of the display panel.
  • Step 103 The timing unit records the receiving moment when each receiving unit receives the sound wave signal.
  • step 103 the timing unit turns on when any one of the receiving units receives the sound wave signal, and records the receiving time corresponding to the receiving unit that received the first sound wave signal as 0, and then records the remaining receiving in turn.
  • the unit receives the reception time corresponding to the acoustic signal, and the timing unit is turned off when the acoustic signals are received by all the receiving units.
  • Step 104 The calculation unit calculates the position coordinates of the touch point on the display panel according to the receiving moments of the respective receiving units recorded by the timing unit.
  • the calculation unit includes a time coordinate generation module and a calculation module, and the time coordinate generation module is connected to the calculation module.
  • step 104 may include the following sub-steps 1041 through 1042.
  • Step 1041 The time coordinate generating module generates, according to the receiving time of each receiving unit recorded by the timing unit, the receiving time coordinates corresponding to the touch point in the n-dimensional coordinate system, and corresponding to each receiving unit according to the reference position stored in the storage unit.
  • the receiving time is used to generate the corresponding receiving time coordinates of the reference position in the n-dimensional coordinate system.
  • Step 1042 The calculation module calculates the Euclidean distance between each reference position and the touch point according to the receiving time coordinate of the touch point and the receiving time coordinate of each reference position in the n-dimensional coordinate system, and determines and touches The Euclidean point of the point is the smallest reference position, so that the position coordinate of the touch point on the display panel is determined as the position coordinate corresponding to the reference position where the Euclidean distance of the touch point is the smallest.
  • a second embodiment of the present invention provides a touch point positioning method, the positioning method comprising: receiving, by a receiving unit, an acoustic wave signal generated at a touch point when the display panel is touched;
  • the timing unit records the receiving time when each receiving unit receives the sound wave signal;
  • the calculating unit calculates the position coordinates of the touch point on the display panel according to the receiving time of each receiving unit recorded by the timing unit.

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  • Theoretical Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Human Computer Interaction (AREA)
  • Acoustics & Sound (AREA)
  • Position Input By Displaying (AREA)
  • User Interface Of Digital Computer (AREA)

Abstract

一种触摸屏及触摸点（9）定位方法，该触摸屏包括显示面板（7）和触摸点定位装置，该触摸点定位装置包括计时单元（2）、计算单元（3）和n个接收单元（1），其中，接收单元（1）设置在显示面板（7）的边缘区域，接收单元（1）与计时单元（2）连接，计时单元（2）与计算单元（3）连接。通过接收单元（1）接收显示面板（7）被触摸时在触摸点（9）处产生的声波信号，计时单元（2）记录各个接收单元（1）接收到声波信号时的接收时刻，并利用计算单元（3）根据计时单元（2）记录的各个接收单元（1）的接收时刻来计算出触摸点（9）在显示面板（7）上的位置坐标，从而实现了对触摸点（9）的定位。

Description

触摸屏及触摸点定位方法 技术领域
本发明涉及显示技术领域，特别涉及触摸屏及触摸点定位方法。
背景技术
表面声波型触摸屏凭借其分辨率高、响应时间短、稳定性好、防暴性好、透光性好等特点，成为目前主流的触摸屏。
在现有技术中，表面声波型触摸屏包括两个发射换能器、两个接收换能器和两组反射条纹阵列，声波发生器通过发射换能器发射能够跨越触摸屏表面的一种高频声波，但是，当手指触及该触摸屏时，该高频声波在触摸点处被阻止，由此确定触摸点的坐标位置。
然而，在实际使用过程中，现有技术中的表面声波型触摸屏存在以下缺陷：一、两组反射条纹阵列会极大地影响触摸屏在显示过程中的显示效果；二、两个发射换能器不断地发射高频声波，从而导致触摸屏的整体功耗较高。
发明内容
本发明提供一种触摸屏及触摸点定位方法，其可有效地对显示面板上的触摸点进行定位。
为实现上述目的，本发明提供了一种触摸屏，其包括显示面板和触摸点定位装置，所述触摸点定位装置包括计时单元、计算单元和n个接收单元，n≥3，其中：所述接收单元设置在所述显示面板的边缘区域，所述接收单元与所述计时单元连接，所述计时单元与所述计算单元连接，所述接收单元用于接收所述显示面板被触摸时在触摸点处产生的声波信号；所述计时单元用于记录各个所述接收单元接收到所述声波信号时的接收时刻；所述计算单元用于根据所述计时单元记录的各个所述接收单元的接收时刻计算出所述触摸点在所述显示面 板上的位置坐标。
可选地，所述计时单元在全部所述接收单元中的任意一个所述接收单元接收到所述声波信号时开启，在全部所述接收单元均接收到所述声波信号时关闭，且将第一个接收到所述声波信号的接收单元对应的接收时刻记录为初始时刻。
可选地，所述定位装置还包括计数单元，所述计数单元与所述计时单元和各个所述接收单元均连接，并且所述计数单元用于对接收到所述声波信号的所述接收单元的数量进行计数，当所述计数单元中的计数值为1时，所述计数单元生成并向所述计时单元发送计时开启信号，当所述计数单元中的计数值为n时，所述计数单元生成并向所述计时单元发送计时关闭信号，并且所述计数单元对所述计数值进行重置，所述计时单元在接收到所述计时开启信号时开启，在接收到所述计时关闭信号时关闭。
可选地，所述触摸点定位装置还包括存储单元，所述存储单元与所述计算单元连接，并且所述存储单元用于预先存储所述显示面板上多个基准位置的位置坐标以及所述基准位置被触摸时各个接收单元对应的接收时刻，所述计算单元包括时刻坐标生成模块和计算模块，所述时刻坐标生成模块与所述计算模块连接，所述时刻坐标生成模块用于根据所述计时单元记录的各个所述接收单元的接收时刻并按照预先设置的所述接收单元的排列顺序生成所述触摸点在n维坐标系中对应的接收时刻坐标，以及根据存储单元中存储的基准位置被触摸时各个接收单元对应的接收时刻并按照所述预先设置的所述接收单元的排列顺序生成所述基准位置在n维坐标系中对应的接收时刻坐标，所述计算模块用于在n维坐标系中根据所述触摸点的接收时刻坐标和各个基准位置的接收时刻坐标，分别计算出各个所述基准位置与所述触摸点之间的欧几里得距离，并判断出与所述触摸点的欧几里得距离最小的基准位置，从而将所述触摸点在显示面板上的位置坐标确定为与所述触摸点的欧几里得距离最小的基准位置对应的位置坐标。
可选地，所述接收单元为压电传感器，所述压电传感器用于在 接收到所述声波信号时产生相应的电信号，并将所述电信号发送至所述计时单元，所述计时单元依次接收各个所述压电传感器产生的电信号，并根据接收到的所述电信号记录各个所述接收单元接收到所述声波信号对应的接收时刻。
可选地，所述接收单元的数量为三个，三个所述接收单元不位于同一直线上。
可选地，所述接收单元的数量为四个，所述显示面板的形状为矩形，四个所述接收单元分别位于所述显示面板的四条边的中点。
为实现上述目的，本发明还提供了一种触摸屏的触摸点定位方法，所述触摸屏包括显示面板、计时单元、计算单元和n个接收单元，其中，n≥3，所述接收单元设置在所述显示面板的边缘区域，所述接收单元与所述计时单元连接，所述计时单元与所述计算单元连接，所述触摸点定位方法包括：通过所述接收单元接收所述显示面板被触摸时在触摸点处产生的声波信号；通过所述计时单元记录各个接收单元接收到所述声波信号时的接收时刻；通过所述计算单元根据所述计时单元记录的各个所述接收单元的接收时刻计算出所述触摸点在所述显示面板上的位置坐标。
可选地，所述计时单元在全部所述接收单元中的任意一个所述接收单元接收到所述声波信号时开启，在全部所述接收单元均接收到所述声波信号时关闭，且将第一个接收到所述声波信号的接收单元对应的接收时刻记录为初始时刻。
可选地，所述触摸点定位装置还包括存储单元，所述存储单元与所述计算单元连接，所述触摸点定位方法在所述接收单元接收所述显示面板被触摸时在触摸点处产生的声波信号的步骤之前还包括：通过存储单元预先存储所述显示面板上多个基准位置的位置坐标以及所述基准位置被触摸时各个接收单元对应的接收时刻，所述计算单元包括时刻坐标生成模块和计算模块，所述时刻坐标生成模块与所述计算模块连接，通过所述计算单元根据所述计时单元记录的各个所述接收单元的接收时刻计算出所述触摸点在所述显示面板上的位置坐标的步骤包括：通过所述时刻坐标生成模块，根据所述计时单元记录的 各个所述接收单元的接收时刻并按照预先设置的所述接收单元的排列顺序生成所述触摸点在n维坐标系中对应的接收时刻坐标，以及根据存储单元中存储的基准位置被触摸时各个接收单元对应的接收时刻并按照所述预先设置的所述接收单元的排列顺序生成所述基准位置在n维坐标系中对应的接收时刻坐标；通过所述计算模块，在n维坐标系中根据所述触摸点的接收时刻坐标和各个基准位置的接收时刻坐标，分别计算出各个所述基准位置与所述触摸点之间的欧几里得距离，并判断出与所述触摸点的欧几里得距离最小的基准位置，从而将所述触摸点在显示面板上的位置坐标确定为与所述触摸点的欧几里得距离最小的基准位置对应的位置坐标。
本发明提供了一种触摸屏及触摸点定位方法，该触摸屏包括计时单元、计算单元和n个接收单元，其中，接收单元设置在显示面板的边缘区域，接收单元与计时单元连接，计时单元与计算单元连接。本发明的技术方案通过接收单元接收显示面板被触摸时在触摸点处产生的声波信号，计时单元记录各个接收单元接收到声波信号时的接收时刻，并利用计算单元根据计时单元记录的各个接收单元的接收时刻来计算出触摸点在显示面板上的位置坐标，从而实现了对触摸点的定位。此外，该触摸屏的整体功耗较低，且其适用范围广。
附图说明
图1为本发明的第一实施例中的触摸屏的触摸点定位装置的结构示意图。
图2为本发明的第一实施例中的触摸屏的触摸点定位原理图。
图3为本发明的第二实施例提供的触摸屏的触摸点定位方法的流程图。
具体实施方式
为使本领域的技术人员更好地理解本发明的技术方案，下面结合附图对本发明提供的触摸屏及触摸点定位方法进行详细描述。
[第一实施例]
图1为本发明的第一实施例中的触摸屏的触摸点定位装置的结构示意图，图2为本发明的第一实施例中的触摸屏的触摸点定位原理图。如图1和图2所示，该触摸屏包括显示面板7和触摸点定位装置，该触摸点定位装置包括计时单元2、计算单元3和n个接收单元1，其中，n≥3，接收单元1设置在显示面板7的边缘区域，接收单元1与计时单元2连接，计时单元2与计算单元3连接，接收单元1用于接收显示面板7被触摸时在触摸点9处产生的声波信号，计时单元2用于记录各个接收单元1接收到声波信号时的接收时刻，计算单元3用于根据计时单元2记录的各个接收单元1的接收时刻计算出触摸点9在显示面板7上的位置坐标。
此处需要说明的是，当显示面板7被触摸时，显示面板7上的触摸点9的位置处会产生相应的振动，从而产生相应的声波信号。
可选地，计时单元2在全部接收单元1中的任意一个接收单元1接收到声波信号时开启，而在全部接收单元1均接收到声波信号时关闭。进一步可选地，触摸点定位装置还包括计数单元10，计数单元10与计时单元2和各个接收单元1均连接。计数单元10用于对接收到声波信号的接收单元1的数量进行计数。当计数单元10中的计数值为1时，计数单元10生成并向计时单元2发送计时开启信号。当计数单元10中的计数值为n时，计数单元10生成并向计时单元2发送计时关闭信号，并且计数单元10对计数值进行重置。计时单元2在接收到计时开启信号时开启，在接收到计时关闭信号时关闭。计时单元2在计时过程中以第一个接收到声波信号的接收单元1对应的接收时刻为初始时刻，本实施例中假定初始时刻为0，然后依次记录下其他接收单元1接收到声波信号时的接收时刻。
可选地，该触摸点定位装置还包括存储单元4，存储单元4与计算单元3连接，存储单元4用于预先存储显示面板7上多个基准位置8的位置坐标以及基准位置8被触摸时各个接收单元1对应的接收时刻。
本实施例中，接收单元1为压电传感器，压电传感器用于在接收到声波信号时产生相应的电信号，并将该电信号发送至计时单元 2，计时单元2依次接收各个压电传感器产生的电信号，并根据接收到的电信号记录各个接收单元1接收到声波信号时对应的接收时刻。本实施例中，由于压电传感器具备结构简单、体积小、质量小的特点，可方便地安装在显示面板7的边缘区域。此外，由于压电传感器具备功耗小的特征，可使得触摸屏的整体功耗得到降低。
进一步地，计算单元3包括时刻坐标生成模块5和计算模块6，时刻坐标生成模块5与计算模块6连接。时刻坐标生成模块5用于根据计时单元2记录的各个接收单元1的接收时刻来生成触摸点9在n维坐标系中对应的接收时刻坐标，以及根据存储单元4中存储的基准位置8被触摸时各个接收单元1对应的接收时刻来生成基准位置8在n维坐标系中对应的接收时刻坐标。计算模块6用于在n维坐标系中根据触摸点9的接收时刻坐标和各个基准位置8的接收时刻坐标，分别计算出各个基准位置8与触摸点9之间的欧几里得距离，并判断出与触摸点9的欧几里得距离最小的基准位置8，从而将触摸点9在显示面板7上的位置坐标确定为与触摸点9的欧几里得距离最小的基准位置8对应的位置坐标。
下面将结合附图对本实施例中的触摸屏的工作原理进行详细的说明。本实施例中，假定接收单元的数量为四个，显示面板7的形状为矩形，四个接收单元1a、1b、1c、1d分别位于显示面板7的四条边的中点。需要说明的是，本实施例中，显示面板7上存在一个触摸点9，该触摸点9可与基准位置8重合，也可不与基座位置8重合。
存储单元4预先存储显示面板7上多个基准位置8的位置坐标(反映在显示面板7上的真实位置的坐标)以及基准位置8被触摸时各个接收单元1a、1b、1c、1d对应的接收时刻，以下将详细描述存储单元4的该预先存储过程。
首先，预先将显示面板7划分为多个网格，且将网格线的交点作为基准位置8，同时记录下各个基准位置8对应的位置坐标。
需要说明的是，本发明中的基准位置8的选择不限于通过上述的网格划分方式，本发明中的基准位置8可以为显示面板7上的任意位置。
然后，用触摸装置(例如，手指、触控笔等)触摸基准位置8，此时被触摸的基准位置8处产生声波信号，该声波信号将会被分别传输到设置在显示面板7边缘的四个接收单元1a、1b、1c、1d。计时单元2在全部接收单元1a、1b、1c、1d中的任意一个接收单元1a、1b、1c或1d接收到声波信号时开启，并将第一个接收到声波信号的接收单元对应的接收时刻记录为0，然后依次记录下其余接收单元接收到声波信号对应的接收时刻。
然后，时刻坐标生成模块5根据计时单元2记录到的各个接收单元1a、1b、1c、1d对应的接收时刻，以及按照预先设置的接收单元的排列顺序(假定四个接收单元的排列顺序依次为：接收单元1a、接收单元1b、接收单元1c、接收单元1d)，生成该基准位置8在四维坐标系中对应的接收时刻坐标(X1、X2、X3、X4)。其中，X1为基准位置8被触摸时接收单元1a对应的接收时刻，X2为基准位置8被触摸时接收单元1b对应的接收时刻，X3为基准位置8被触摸时接收单元1c对应的接收时刻，X4为基准位置8被触摸时接收单元1d对应的接收时刻。
需要说明的是，本实施例中由于接收单元1a、1b、1c、1d的数量为四个，因此相应地n维坐标系为四维坐标系。
最后，采用上述的方法获取显示面板7上各个基准位置8所对应的位置坐标以及接收时刻坐标，并将其存储于存储单元4中，至此，存储单元4的预先存储过程结束。
接下来，将对触摸点定位过程进行详细描述。
首先，当触摸装置触摸显示面板7上的任何一个位置时，该位置作为触摸点9，在触摸点9处将产生声波信号，该声波信号将会被分别传输到设置在显示面板7边缘的四个接收单元1a、1b、1c、1d。计数单元10对接收到声波信号的接收单元的数量进行计数。具体地，当接收单元接收到声波信号时会产生相应的电信号，接收单元在向计时单元2发送该电信号的同时也向计数单元10发送该电信号，计数单元10通过计算接收到的电信号的数量而实现对接收到声波信号的接收单元的数量进行计数。当全部接收单元1a、1b、1c、1d中的任 意一个接收单元接收到声波信号时，计数单元10中的计数值为1，计数单元10生成并向计时单元2发送计时开启信号。计时单元2在接收到计时开启信号时开启，并将第一个接收到声波信号的接收单元对应的接收时刻记录为0，然后依次记录下其余接收单元接收到声波信号对应的接收时刻。当全部接收单元1a、1b、1c、1d均接收到声波信号时，计数单元10中的计数值为4，计数单元10生成并向计时单元2发送计时关闭信号，并且计数单元10对计数值进行重置。计时单元2在接收到计时关闭信号时关闭。
然后，时刻坐标生成模块5根据计时单元2记录到的各个接收单元1a、1b、1c、1d对应的接收时刻，以及按照预先设置的接收单元的排列顺序(与预先存储过程中的排列顺序相同)，生成该触摸点9在四维坐标系中对应的接收时刻坐标(X1’、X2’、X3’、X4’)，其中X1’为触摸点9处产生的声波信号被接收单元1a接收到时对应的接收时刻，X2’为触摸点9处产生的声波信号被接收单元1b接收到时对应的接收时刻，X3’为触摸点9处产生的声波信号被接收单元1c接收到时对应的接收时刻，X4’为触摸点9处产生的声波被接收单元1d接收到时对应的接收时刻。
最后，计算模块6计算出各个基准位置8与触摸点9之间的欧几里得距离D，其中
Figure PCTCN2015070111-appb-000001
基于计算出的各个基准位置8与触摸点9之间的欧几里得距离，判断出与触摸点9的欧几里得距离最小的基准位置8，并从存储单元4中获取到与触摸点9的欧几里得距离最小的基准位置8对应的位置坐标，并将该位置坐标作为触摸点9的位置坐标，至此，触摸点定位过程结束。
需要说明的是，在存储单元4的预先存储过程中，存储单元4与计时单元2连接，但是，在触摸点定位过程中，存储单元4无需与计时单元2连接。
此外，需要说明的是，本实施例中接收单元1的数量为四个、显示面板7的形状为矩形、四个接收单元1a、1b、1c、1d分别位于 显示面板7的四条边的中点的情况仅起到示例性的作用，并不对本申请的技术方案产生限制。
本实施例中，接收单元1的数量大于或等于三个即可。当接收单元1的数量为三个时，三个接收单元1不能位于同一直线上(接收单元的数量为三个的情况未给出相应附图)。
需要说明的是，本实施例中触摸点定位的精度与显示面板7上基准位置8的数量以及分布相关，即基准位置8的数量越多或者基准位置8的分布越密，则相应地触摸点定位的精度越高。
本实施例提供了一种触摸屏，该触摸屏包括显示面板和触摸点定位装置，该触摸点定位装置包括计时单元、计算单元和n个接收单元，其中，接收单元设置在显示面板的边缘区域，接收单元与计时单元连接，计时单元与计算单元连接。本发明的技术方案通过接收单元接收显示面板被触摸时在触摸点处产生的声波信号，计时单元记录各个接收单元接收到声波信号时的接收时刻，并利用计算单元根据计时单元记录的各个接收单元的接收时刻来计算出触摸点在显示面板上的位置坐标，从而实现了对触摸点的定位。此外，在本实施例中，由于触摸屏中的接收单元设置在显示面板的边缘区域，因此接收单元的设置不会影响显示面板的显示效果。此外，当该接收单元采用压电传感器时，由于压电传感器功耗极低，因此不会增加触摸屏的整体功耗。同时，触摸屏中的计时单元可在全部接收单元中的任意一个接收单元接收到声波信号时开启，而在全部接收单元均接收到声波信号时关闭，从而可有效地减少触摸屏的整体功耗。
[第二实施例]
图3为本发明的第二实施例提供的触摸屏的触摸点定位方法的流程图，该触摸点定位方法应用于一种触摸屏，该触摸屏包括显示面板和触摸点定位装置，该触摸点定位装置包括存储单元、计时单元、计算单元和n个接收单元，其中，n≥3，接收单元设置在显示面板的边缘区域，存储单元与计算单元连接，接收单元与计时单元连接，计时单元与计算单元连接，该触摸点定位方法包括以下步骤101至104。
步骤101：存储单元预先存储显示面板上多个基准位置的位置坐 标以及基准位置被触摸时各个接收单元对应的接收时刻，该过程可参见以上第一实施例中的描述，此处不在赘述。
步骤102：接收单元接收显示面板被触摸时在触摸点处产生的声波信号。
在步骤102中，当显示面板被触摸装置触摸时，在触摸点处会产生相应的声波信号，该声波信号将会被设置在显示面板的边缘区域的n个接收单元接收。
步骤103：计时单元记录各个接收单元接收到声波信号时的接收时刻。
在步骤103中，计时单元在全部接收单元中的任意一个接收单元接收到声波信号时开启，并将第一个接收到声波信号的接收单元对应的接收时刻记录为0，然后依次记录下其余接收单元接收到声波信号对应的接收时刻，且当在全部接收单元均接收到声波信号时计时单元关闭。
步骤104：计算单元根据计时单元记录的各个接收单元的接收时刻来计算出触摸点在显示面板上的位置坐标。
在步骤104中，可选地，计算单元包括时刻坐标生成模块和计算模块，时刻坐标生成模块与计算模块连接。
具体地，步骤104可包括以下子步骤1041至1042。
步骤1041：时刻坐标生成模块根据计时单元记录的各个接收单元的接收时刻来生成触摸点在n维坐标系中对应的接收时刻坐标，以及根据存储单元中存储的基准位置被触摸时各个接收单元对应的接收时刻来生成基准位置在n维坐标系中对应的接收时刻坐标。
步骤1042：计算模块在n维坐标系中根据触摸点的接收时刻坐标和各个基准位置的接收时刻坐标，分别计算出各个基准位置与触摸点之间的欧几里得距离，并判断出与触摸点的欧几里得距离最小的基准位置，从而将触摸点在显示面板上的位置坐标确定为与触摸点的欧几里得距离最小的基准位置对应的位置坐标。
本发明的第二实施例提供了一种触摸点定位方法，该定位方法包括：接收单元接收显示面板被触摸时在触摸点处产生的声波信号； 计时单元记录各个接收单元接收到声波信号时的接收时刻；计算单元根据计时单元记录的各个接收单元的接收时刻计算出触摸点在显示面板上的位置坐标。基于上述步骤，本发明的技术方案可实现对显示面板上的触摸点的定位。
可以理解的是，以上实施方式仅仅是为了说明本发明的原理而采用的示例性实施方式，然而本发明并不局限于此。对于本领域内的普通技术人员而言，在不脱离本发明的精神和实质的情况下，可以做出各种变型和改进，这些变型和改进也视为本发明的保护范围。

Claims (10)

  1. 一种触摸屏，包括显示面板和触摸点定位装置，所述触摸点定位装置包括计时单元、计算单元和n个接收单元，n≥3，其中：
    所述接收单元设置在所述显示面板的边缘区域，所述接收单元用于接收所述显示面板被触摸时在触摸点处产生的声波信号；
    所述计时单元用于记录各个所述接收单元接收到所述声波信号时的接收时刻；
    所述计算单元用于根据所述计时单元记录的各个所述接收单元的接收时刻计算出所述触摸点在所述显示面板上的位置坐标。
  2. 根据权利要求1所述的触摸屏，其中，所述计时单元在全部所述接收单元中的任意一个所述接收单元接收到所述声波信号时开启，在全部所述接收单元均接收到所述声波信号时关闭，且将第一个接收到所述声波信号的接收单元对应的接收时刻记录为初始时刻。
  3. 根据权利要求2所述的触摸屏，其中，
    所述触摸点定位装置还包括计数单元，所述计数单元用于对接收到所述声波信号的所述接收单元的数量进行计数，当所述计数单元中的计数值为1时，所述计数单元生成并向所述计时单元发送计时开启信号，当所述计数单元中的计数值为n时，所述计数单元生成并向所述计时单元发送计时关闭信号，并且所述计数单元对所述计数值进行重置，
    所述计时单元在接收到所述计时开启信号时开启，在接收到所述计时关闭信号时关闭。
  4. 根据权利要求1所述的触摸屏，其中，
    所述定位装置还包括存储单元，所述存储单元用于预先存储所述显示面板上多个基准位置的位置坐标以及所述基准位置被触摸时各个接收单元对应的接收时刻，
    所述计算单元包括时刻坐标生成模块和计算模块，
    所述时刻坐标生成模块用于根据所述计时单元记录的各个所述接收单元的接收时刻并按照预先设置的所述接收单元的排列顺序来生成所述触摸点在n维坐标系中对应的接收时刻坐标，以及根据存储单元中存储的基准位置被触摸时各个接收单元对应的接收时刻并按照所述预先设置的所述接收单元的排列顺序来生成所述基准位置在n维坐标系中对应的接收时刻坐标；
    所述计算模块用于在n维坐标系中根据所述触摸点的接收时刻坐标和各个基准位置的接收时刻坐标，分别计算出各个所述基准位置与所述触摸点之间的欧几里得距离，并判断出与所述触摸点的欧几里得距离最小的基准位置，从而将所述触摸点在显示面板上的位置坐标确定为与所述触摸点的欧几里得距离最小的基准位置对应的位置坐标。
  5. 根据权利要求1所述的触摸屏，其中，
    所述接收单元为压电传感器，所述压电传感器用于在接收到所述声波信号时产生相应的电信号，并将所述电信号发送至所述计时单元，
    所述计时单元依次接收各个所述压电传感器产生的电信号，并根据接收到的所述电信号记录各个所述接收单元接收到所述声波信号对应的接收时刻。
  6. 根据权利要求1所述的触摸屏，其中，所述触摸点定位装置包括三个所述接收单元，三个所述接收单元不位于同一直线上。
  7. 根据权利要求1所述的触摸屏，其中，所述触摸点定位装置包括四个所述接收单元，所述显示面板的形状为矩形，四个所述接收单元分别位于所述显示面板的四条边的中点。
  8. 一种触摸屏的触摸点定位方法，所述触摸屏包括显示面板和 触摸点定位装置，所述触摸点定位装置包括计时单元、计算单元和n个接收单元，n≥3，所述接收单元设置在所述显示面板的边缘区域，所述触摸点定位方法包括步骤：
    通过所述接收单元接收所述显示面板被触摸时在触摸点处产生的声波信号；
    通过所述计时单元记录各个接收单元接收到所述声波信号时的接收时刻；以及
    通过所述计算单元根据所述计时单元记录的各个所述接收单元的接收时刻计算出所述触摸点在所述显示面板上的位置坐标。
  9. 根据权利要求8所述的触摸屏的触摸点定位方法，其中，所述计时单元在全部所述接收单元中的任意一个所述接收单元接收到所述声波信号时开启，在全部所述接收单元均接收到所述声波信号时关闭，且将第一个接收到所述声波信号的接收单元对应的接收时刻记录为初始时刻。
  10. 根据权利要求8所述的触摸屏的触摸点定位方法，其中，
    所述触摸点定位装置还包括存储单元，所述触摸点定位方法在所述接收单元接收所述显示面板被触摸时在触摸点处产生的声波信号的步骤之前还包括：
    通过存储单元预先存储所述显示面板上多个基准位置的位置坐标以及所述基准位置被触摸时各个接收单元对应的接收时刻，
    所述计算单元包括时刻坐标生成模块和计算模块，通过所述计算单元根据所述计时单元记录的各个所述接收单元的接收时刻计算出所述触摸点在所述显示面板上的位置坐标的步骤包括：
    通过所述时刻坐标生成模块，根据所述计时单元记录的各个所述接收单元的接收时刻并按照预先设置的所述接收单元的排列顺序来生成所述触摸点在n维坐标系中对应的接收时刻坐标，以及根据存储单元中存储的基准位置被触摸时各个接收单元对应的接收时刻并按照所述预先设置的所述接收单元的排列顺序来生成所述基准位置 在n维坐标系中对应的接收时刻坐标；以及
    通过所述计算模块，在n维坐标系中根据所述触摸点的接收时刻坐标和各个基准位置的接收时刻坐标，分别计算出各个所述基准位置与所述触摸点之间的欧几里得距离，并判断出与所述触摸点的欧几里得距离最小的基准位置，从而将所述触摸点在显示面板上的位置坐标确定为与所述触摸点的欧几里得距离最小的基准位置对应的位置坐标。
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