WO2011072588A1 - 一种红外触摸屏 - Google Patents

一种红外触摸屏 Download PDF

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Publication number
WO2011072588A1
WO2011072588A1 PCT/CN2010/079646 CN2010079646W WO2011072588A1 WO 2011072588 A1 WO2011072588 A1 WO 2011072588A1 CN 2010079646 W CN2010079646 W CN 2010079646W WO 2011072588 A1 WO2011072588 A1 WO 2011072588A1
Authority
WO
WIPO (PCT)
Prior art keywords
edge
infrared
ambient light
stage
receiving tube
Prior art date
Application number
PCT/CN2010/079646
Other languages
English (en)
French (fr)
Inventor
叶新林
刘建军
刘新斌
Original Assignee
北京汇冠新技术股份有限公司
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.)
Filing date
Publication date
Application filed by 北京汇冠新技术股份有限公司 filed Critical 北京汇冠新技术股份有限公司
Priority to KR1020127018421A priority Critical patent/KR101736233B1/ko
Priority to US13/515,751 priority patent/US9052778B2/en
Priority to EP10837025.5A priority patent/EP2515216B1/en
Publication of WO2011072588A1 publication Critical patent/WO2011072588A1/zh

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Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • G06F3/0421—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen
    • 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
    • G06F3/0304—Detection arrangements using opto-electronic means
    • G06F3/0325—Detection arrangements using opto-electronic means using a plurality of light emitters or reflectors or a plurality of detectors forming a reference frame from which to derive the orientation of the object, e.g. by triangulation or on the basis of reference deformation in the picked up image
    • 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
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04109—FTIR in optical digitiser, i.e. touch detection by frustrating the total internal reflection within an optical waveguide due to changes of optical properties or deformation at the touch location
    • 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
    • G06F3/0304—Detection arrangements using opto-electronic means
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • G06F3/0421—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen
    • G06F3/0423—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen using sweeping light beams, e.g. using rotating or vibrating mirror
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • G06F3/0428—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by sensing at the edges of the touch surface the interruption of optical paths, e.g. an illumination plane, parallel to the touch surface which may be virtual

Definitions

  • the invention relates to a touch screen, in particular to an infrared touch screen resistant to light interference. Background technique
  • the present invention provides an infrared touch screen that is resistant to light interference, and includes:
  • a touch detection area a plurality of edges including at least a first edge and a second edge, wherein the first edge and the second edge are opposite to each other, and an infrared transmitting tube and an infrared receiving tube are mounted on the first edge, An infrared transmitting tube and an infrared receiving tube are mounted on the second edge;
  • phase management mechanism configured to: control an alternation of each phase of the infrared touch screen, the infrared touch screen having a plurality of phases including at least a first phase and a second phase;
  • the stage management mechanism controls an infrared transmitting tube mounted on the first edge and an infrared receiving tube mounted on the second edge to scan the touch detecting area;
  • the phase management mechanism controls the infrared receiving tube mounted on the first edge and the infrared transmitting tube mounted on the second edge to scan the touch detecting area i or .
  • the plurality of edges further includes a third edge and a fourth edge,
  • the third edge is opposite to the fourth edge, and an infrared transmitting tube is mounted on the third edge, and an infrared receiving tube is mounted on the fourth edge.
  • the plurality of edges further includes a third edge and a fourth edge, the third edge being opposite to the fourth edge, and the infrared receiving tube is mounted on the third edge An infrared transmitting tube is mounted on the fourth edge.
  • a standard ambient light intensity is pre-set in the phase management mechanism
  • the stage management mechanism control unit described in H'J When in the first stage, if the intensity of the ambient light received by the infrared receiving tube mounted on the second edge is not greater than the standard ambient light intensity, the stage management mechanism control unit described in H'J The infrared touch screen continues to operate in the first stage; if the ambient light received by the infrared receiving tube mounted on the second edge is stronger than the standard ambient light intensity, the stage management mechanism controls the infrared touch screen Terminating the first phase, entering the second phase;
  • the stage management mechanism control unit described in H'J When in the second stage, if the intensity of the ambient light received by the infrared receiving tube mounted on the first edge is not greater than the standard ambient light intensity, the stage management mechanism control unit described in H'J The infrared touch screen continues to operate in the second stage; if the ambient light received by the infrared receiving tube mounted on the first edge is stronger than the standard ambient light intensity, the stage management mechanism controls the infrared touch screen The second phase is terminated and the first phase is entered.
  • infrared light emitted by an infrared transmitting tube mounted on either edge can be received by at least one infrared receiving tube mounted on an edge opposite the edge.
  • the infrared emitters on the same edge are mounted at the same or the same height as the infrared receiver tubes.
  • the present invention also provides another infrared touch screen, comprising: a touch detection area; a plurality of edges including at least a first edge, a second edge, a third edge and a fourth edge, the first edge and the second edge Opposite to each other, the third edge is opposite to the fourth edge, and an infrared transmitting tube and an infrared receiving tube are mounted on each of the first edge, the second edge, the third edge and the fourth edge; as well as
  • phase management mechanism configured to: control the infrared touch screen Alternating at each stage, the infrared touch screen has a plurality of stages including at least a third stage, a fourth stage, a fifth stage, and a sixth stage;
  • the stage management mechanism controls an infrared transmitting tube mounted on the first edge and an infrared receiving tube mounted on the second edge to scan the touch detection area, and the control is installed in the An infrared transmitting tube on the third edge and an infrared receiving tube mounted on the fourth edge scan the touch detection 'j area;
  • the stage management mechanism controls an infrared transmitting tube mounted on the first edge and an infrared receiving tube mounted on the second edge to scan the touch detecting area, and the control is installed in the An infrared receiving tube on the third edge and an infrared transmitting tube mounted on the fourth edge scan the touch detection area;
  • the stage management mechanism controls an infrared receiving tube mounted on the first edge and an infrared transmitting tube mounted on the second edge to scan the touch detection area, and the control is installed in the An infrared receiving tube on the third edge and an infrared transmitting tube mounted on the fourth edge scan the touch detection area;
  • the stage management mechanism controls an infrared receiving tube mounted on the first edge and an infrared transmitting tube mounted on the second edge to scan the touch detection area, and the control is installed in the An infrared transmitting tube on the third edge and an infrared receiving tube mounted on the fourth edge scan the touch detection 'j area.
  • a standard ambient light intensity is pre-set in the phase management mechanism
  • the phase management mechanism of H'J controls the infrared touch screen to continue to run the third stage; if the infrared receiving tube mounted on the second edge receives the ambient light, the light is stronger than The standard ambient light intensity, the intensity of the ambient light received by the infrared receiving tube installed on the fourth edge is not greater than the standard ambient light intensity, and the phase management mechanism of the H'J controls the third stage of the infrared touch screen to be terminated.
  • the sixth stage if the intensity of the ambient light received by the infrared receiving tube mounted on the second edge is not greater than the standard ambient light intensity, the ambient light received by the infrared receiving tube mounted on the fourth edge is strong In the standard ambient light intensity, the stage management mechanism controls the infrared touch screen to terminate the third stage, and runs the fourth stage. Stage; if the ambient light received by the infrared receiving tube mounted on the second edge is stronger than the standard ambient light, the ambient light received by the infrared receiving tube mounted on the fourth edge is stronger than the standard environment The light intensity, the phase management mechanism controls the infrared touch screen to terminate the third phase, and the fifth phase is operated;
  • the phase management mechanism of H'J controls the infrared touch screen to continue to run the fourth stage; if the infrared receiving tube mounted on the second edge receives the ambient light, the light is stronger than The ambient light intensity, the intensity of the ambient light received by the infrared receiving tube installed on the third edge is not greater than the standard ambient light intensity, and the phase management mechanism of the H'J controls the fourth stage of the infrared touch screen to be terminated.
  • the fifth stage if the intensity of the ambient light received by the infrared receiving tube mounted on the second edge is not greater than the standard ambient light intensity, the ambient light received by the infrared receiving tube mounted on the third edge is strong In the standard ambient light intensity, the stage management mechanism controls the infrared touch screen to terminate the fourth stage, and the third stage is run; if the infrared receiving is installed on the second edge The ambient light received is stronger than the standard ambient light intensity, and the ambient light received by the infrared receiving tube mounted on the third edge is stronger than the standard ambient light intensity, and the stage management mechanism controls the infrared The touch screen terminates the fourth stage and runs the sixth stage;
  • the phase management mechanism of H'J controls the infrared touch screen to continue to run the fifth stage; if the infrared receiving tube mounted on the first edge receives the ambient light, the light is stronger than The standard ambient light intensity, the intensity of the ambient light received by the infrared receiving tube installed on the third edge is not greater than the standard ambient light intensity, and the phase management mechanism of the H'J controls the infrared touch screen to terminate the fifth stage, running The fourth stage; if the intensity of the ambient light received by the infrared receiving tube mounted on the first edge is not greater than the standard ambient light intensity, the ambient light received by the infrared receiving tube mounted on the third edge is strong In the standard ambient light intensity, the stage management mechanism controls the infrared touch screen to terminate
  • the phase management mechanism of H'J controls the infrared touch screen to continue to run the sixth stage; if the infrared receiving tube installed on the first edge receives the ambient light, the light is stronger than The standard ambient light intensity, the intensity of the ambient light received by the infrared receiving tube installed on the fourth edge is not greater than the standard ambient light intensity, and the phase management mechanism of the H'J controls the infrared touch screen to terminate the sixth stage, running The third stage; if the intensity of the ambient light received by the infrared receiving tube mounted on the first edge is not greater than the standard ambient light intensity, the ambient light received by the infrared receiving tube mounted on the fourth edge is strong In the standard ambient light intensity, the stage management mechanism controls the infrared touch screen to terminate
  • infrared light emitted by an infrared transmitting tube mounted on either edge can be received by at least one infrared receiving tube mounted on an edge opposite the edge.
  • the infrared emitters on the same edge are mounted at the same or the same height as the infrared receiver tubes.
  • FIG. 1 is a structural diagram of an infrared touch screen according to the principles of the present invention
  • FIG. 2 is a view showing a state transition diagram of various stages in the infrared touch screen controlled by the stage management mechanism of FIG. 1;
  • FIG. 3 shows a structural tube diagram of another infrared touch screen in accordance with the principles of the present invention
  • FIG. 4 illustrates the stage management mechanism of FIG. 3 controlling various stages in the infrared touch screen. State transition diagram
  • 5A is a cross-sectional structural view showing an installation manner of an infrared transmitting tube and an infrared receiving tube in an infrared touch screen according to the present invention
  • 5B is a cross-sectional structural view showing another mounting manner of the infrared transmitting tube and the infrared receiving tube in the infrared touch screen according to the present invention
  • FIG. 6 is a flow chart showing a touch positioning method of the infrared touch screen of FIG. 1;
  • FIG. 7 is a reference diagram of a formula for calculating coordinates of a touch object position in the touch positioning method shown in FIG. 6;
  • FIG. 8 is a structural tube diagram of an optimized manner of the infrared touch screen shown in FIG. 1;
  • 9A is an infrared light path distribution diagram of the infrared touch screen shown in FIG. 8;
  • 9B is another infrared light path distribution diagram of the infrared touch screen shown in FIG. 8;
  • FIG. 9C is a third infrared light path distribution diagram of the infrared touch screen shown in FIG. 8; and FIG. 9D is a fourth infrared light path distribution diagram of the infrared touch screen shown in FIG.
  • the infrared touch screen 100 is shown to include two edges: a first edge 101 and a second edge 102
  • the first edge 101 is opposite to the second edge 102.
  • the infrared emitting tube 111 and the infrared receiving tube 112 are mounted on the first edge 101, and the infrared emitting tube 111 and the infrared receiving tube 112 are also mounted on the second edge 102.
  • the infrared light emitted by each of the infrared transmitting tubes 111 mounted on the first edge 101 can be received by at least one infrared receiving tube 112 mounted on the second edge 102.
  • each of the infrared transmitting tubes 111 mounted on the second edge 101 can be mounted on the first edge 102.
  • At least one infrared receiving tube 112 is received. This causes the infrared light path 105 between the infrared transmitting tube 111 and the infrared receiving tube 112 to form an obliquely intersecting infrared light array within the touch detecting area 106 between the first edge 101 and the second edge 102.
  • FIG. 6 is a flowchart of a touch positioning method of the infrared touch screen 100.
  • the method for implementing touch positioning by the infrared touch screen 100 includes the following steps:
  • step 601 activate the infrared touch screen, and strobe all preset infrared light paths in sequence.
  • the infrared light path between them forms an array of intersecting infrared light (or called an infrared light grid) in the touch detection area.
  • the infrared touch screen 100 performs this step, wherein the number of the infrared transmitting tubes 111 on the first edge 101 is ii, i2, i3...in, and the number of the infrared receiving tubes 112 on the second edge 102 is ⁇ ,
  • step 602 Go to step 602 to determine whether there is an infrared light path blocked. If no infrared light path is blocked, return to step 601. If the infrared light path is blocked, record the blocked infrared light path.
  • step 602 if no infrared light path is blocked, it means that there is no touch object in the touch detection area, then return to step 601, and then sequentially strobe all the infrared light paths to detect the entire touch detection area; if there is an infrared light path Blocking, it means that there is a touch object in the touch detection area.
  • the infrared touch screen 100 performs this step as follows. For example, the infrared touch screen sequentially strobes the red xi ib iirp, ⁇ 2 ⁇ +1, 13 ⁇ +2... in+l- Prn, ⁇ , iq+ir2, ⁇ +2 ⁇ 3...
  • step 601 When there is no infrared light path blocked at inrn+1-q, return to step 601; if the infrared light path i3r P+ 2, i q+ 4r5 is blocked, record the infrared light path i3r The coordinates of the infrared transmitting tube i3, i q+ 4, and the infrared receiving tube r P+ 2, rs corresponding to P+ 2, i q+ 4r5. Go to step 603, calculate the coordinates of the intersection between the blocked infrared light paths, the coordinates of the intersection point is the coordinates of the touch object, and send the coordinate data to the computer for processing.
  • any two blocked infrared light paths AC, BD are selected from the blocked infrared light paths obtained in step 601, wherein the infrared light corresponding to the blocked infrared light path AC
  • the internal coordinate of the launch tube A is (m, a)
  • the internal coordinate of the corresponding infrared receiving tube C is (n, c)
  • the internal coordinate of the infrared transmitting tube B corresponding to the blocked infrared light path BD is (m) , b)
  • the internal coordinate of the corresponding infrared receiving tube D is (n, d).
  • the coordinates of the infrared transmitting tube and the infrared receiving tube corresponding to the blocked infrared light path obtained in the step are A (m, a), C (n, c ), B (m, b ), D (n, d) are substituted into the formula
  • the coordinate data of the calculated intersection point o that is, the coordinate data (x, y) of the touch object, is sent to the computer for processing, and responds to the touch operation.
  • the infrared touch screen 100 performs the following steps: the infrared transmitting tubes i3 (0, 3), iq+4 (0, q+4), and the infrared receiving tube rp+2 (h, p+2), r5 ( The coordinates of h, 5) are substituted into the formula ab ⁇
  • ambient light The light interference caused by the infrared touch screen is mainly the light interference of the sunlight from the east-west direction, so the first edge 101 of the infrared touch screen 100 can be placed with respect to the east edge 102 to further reduce the light interference.
  • the detection accuracy of the infrared touch screen 100 as shown in FIG.
  • the infrared touch screen 100 allows the infrared touch screen 100 to have a third edge 103 and a fourth edge 104.
  • the third edge 103 is opposite to the fourth edge 104, and the third edge 103 is mounted with infrared emission.
  • the tube 111 is mounted with an infrared receiving tube 112 on the fourth edge 104.
  • the infrared light emitted by any one of the infrared transmitting tubes 111 mounted on the third edge 103 can be received by at least one infrared receiving on the fourth edge 104.
  • the infrared transmitting tube 111 mounted on the third edge 103 can be completely replaced by the infrared receiving tube 112.
  • all the infrared receiving tubes 112 mounted on the fourth edge 104 can be mounted.
  • infrared touch screen may be provided as shown in FIG. 9A, 9B, 9C infrared light path profile shown in FIG. 9D, any one,.
  • phase management mechanism 107 capable of controlling the infrared touch screen 100 to alternate between stages.
  • FIG. 2 shows a state diagram 200 of an exemplary operation of the phase management mechanism 107 in the infrared touch screen 100.
  • phase management mechanism 107 waits for a change in the next phase of the infrared touch screen and, in effect, controls the next phase change when the time is appropriate.
  • the infrared touch screen 100 can have more stages, it is shown in Fig. 2 as having only the first stage 211 and the second stage 212.
  • the stage management mechanism 107 controls the infrared transmitting tube 111 mounted on the first edge 101 and the infrared receiving tube 112 mounted on the second edge 102 to scan the touch detecting area 106; when switching to the second At stage 212, the stage management mechanism 107 controls the infrared receiving tube 112 mounted on the first edge 101 and the infrared emitting tube 111 mounted on the second edge 102 to scan the touch detection area 106.
  • a standard ambient light intensity m is pre-set in the phase management mechanism 107 of the infrared touch screen 100.
  • the intensity X of the ambient light received by the infrared receiving tube 112 is not greater than the standard ambient light intensity m (ie, X m )
  • the ambient light does not affect the infrared receiving tube to receive the infrared light emitted by the corresponding infrared transmitting tube.
  • the stage management mechanism 107 can compare the intensity X of the ambient light received by the infrared transmitting tube 104 obtained from time to time with the standard ambient light intensity m. The control phases alternate.
  • the stage management mechanism 107 controls the infrared touch screen 100 to continue to operate the first stage 211. If the intensity of the ambient light received by the infrared receiving tube 112 on the second edge 102 is XiQ2>m, the stage management mechanism 107 controls the infrared touch screen 100 to terminate the first stage 211, entering the second stage 212; At the second stage 212, the stage management mechanism 107 controls the infrared touch screen 100 to continue to operate the second stage 212, such as the intensity of the ambient light Xim received by the infrared receiving tube 112 mounted on the first edge 101.
  • the stage management mechanism 107 controls the infrared touch screen 100 to terminate the second stage 212 to enter the first stage 211. That is, if the ambient light received by the infrared receiving tube 112 currently installed on the current receiving edge of the infrared light is stronger than the preset standard ambient light intensity, the stage of the infrared touch screen is changed, and the current receiving edge is on the edge.
  • the mounted infrared emitting tube scans the touch detection area 106 with an infrared receiving tube mounted on the edge opposite the current receiving edge.
  • the stage management mechanism 107 can be loaded into the microprocessor. Through this structural change and the application of the stage management mechanism, the infrared touch screen effectively weakens or eliminates the light caused by the ambient light (such as sunlight) illumination direction and intensity over time and the environment changes to the infrared touch screen. interference.
  • the infrared touch screen 300 is illustrated as including four edges: a first edge 101, a second edge 102 a third edge 103 and a fourth edge 104, the first edge 101 is opposite to the second edge 102, the third edge 103 is opposite to the fourth edge 104, and an infrared transmitting tube 111 and an infrared receiving tube are simultaneously mounted on each edge 112.
  • infrared light emitted from the infrared transmitting tube 111 mounted on any one edge can be received by at least one infrared receiving tube 112 mounted on the opposite edge of the edge.
  • the infrared light path 105 between the infrared transmitting tube 111 and the infrared receiving tube 112 causes the infrared light path 105 between the infrared transmitting tube 111 and the infrared receiving tube 112 to form an infrared light array capable of detecting the oblique crossing or cross of the position of the touch object in the touch detecting area 106 located between the four edges.
  • the infrared light emitted by the infrared transmitting tube 111 mounted on any one of the edges is shown in Fig. 3 as being receivable by an infrared receiving tube 112 mounted on the opposite edge of the edge, infrared emission
  • the infrared light path 105 between the tube 111 and the infrared receiving tube 112 is shown in FIG.
  • FIG. 4 shows a state diagram 400 of an exemplary operation of the stage management mechanism 107 in the infrared touch screen 300.
  • the infrared touch screen 300 can have more stages, it is shown in FIG. 4 as having only four stages of the third stage 213, the fourth stage 214, the fifth stage 215, and the sixth stage 216.
  • the phase management mechanism 107 waits for a change in the next phase of the infrared touch screen 300, and in effect controls the next phase change when the time is appropriate.
  • the infrared transmitting tube 111 mounted on the first edge 101 and the infrared receiving tube 112 mounted on the second edge 102 are scanned to scan the touch detecting area 106 to control the mounting on the third edge 103.
  • the infrared transmitting tube 111 scans the touch detecting area 106 with the infrared receiving tube 112 mounted on the fourth edge; when in the fourth stage 214, controls the infrared emitting tube 111 mounted on the first edge 101 and mounted on the second edge 102
  • the upper infrared receiving tube 112 scans the touch detection area 106, and controls the infrared receiving tube 112 mounted on the third edge 103 and the infrared transmitting tube 111 mounted on the fourth edge 104 to scan the touch detecting area 106; when in the fifth stage 215
  • the touch detecting area 106 is scanned, and the infrared receiving tube 112 mounted on the third edge 103 is controlled to be mounted on the infrared receiving tube 112.
  • the infrared transmitting tube 111 on the fourth edge 104 scans the touch detection area 106; when in the sixth stage 216, controls the infrared receiving tube 112 mounted on the first edge 101 and mounted on
  • the infrared emission tube 111 on the second edge 102 scans the touch detection area 106, and controls the infrared emission tube 111 mounted on the third edge 103 and the infrared receiving tube 112 mounted on the fourth edge 104 to scan the touch detection area 106. That is, the infrared touch screen 300 selects one of the first edge and the second edge as the emission edge and the other edge as the reception edge under the control of the stage management mechanism 107, while selecting one of the third edge and the fourth edge. As the emitting edge, the other edge acts as the receiving edge, thus combining to form different phases.
  • a standard ambient light intensity m is also pre-set in the phase management mechanism 107 of the infrared touch screen 300.
  • the intensity X of the ambient light received by the infrared receiving tube 112 is not greater than the standard ambient light intensity m (ie, X m
  • the ambient light at this time does not affect the infrared receiving tube to receive the infrared light emitted by the corresponding infrared transmitting tube.
  • the stage management mechanism 107 can compare the light intensity X of the ambient light received by the infrared transmitting tube 104 obtained from time to time with the standard ambient light intensity m to control the phase alternation.
  • the stage at which the infrared touch screen is placed is changed so that for each such receiving edge By the receiving edge
  • the upper infrared radiation tube and the infrared receiving tube mounted on the edge opposite the receiving edge scan the touch detection area 106.
  • the light intensity XiQ2m of the ambient light received by the infrared receiving tube 112 mounted on the second edge 102 is received by the infrared receiving tube 112 mounted on the fourth edge 104.
  • the intensity of the ambient light, XiQ4m continues to run the third stage 213; the intensity of the ambient light received by the infrared receiving tube 112 mounted on the second edge 102, XiQ2>m, is mounted on the fourth edge 104.
  • the intensity XiQ4 m of the ambient light received by the upper infrared receiving tube 112 terminates the third stage 213, which runs the sixth stage 216; the ambient light received by the infrared receiving tube 112 mounted on the second edge 102
  • Light intensity XiQ2 m, the intensity of the ambient light received by the infrared receiving tube 112 mounted on the fourth edge 104, XiQ4>m terminates the third stage 213, runs the fourth stage 214; if installed at the second edge
  • the light intensity XiQ2>m of the ambient light received by the infrared receiving tube 112 on 102, and the light intensity XiQ4>m of the ambient light received by the infrared receiving tube 112 mounted on the fourth edge 104 terminates the third stage. 213. Run the fifth stage 215.
  • the intensity X 103 ⁇ m of the ambient light received by the infrared receiving tube 112 terminates the fourth stage 214, which runs the fifth stage 215; the ambient light received by the infrared receiving tube 112 mounted on the second edge 102
  • the intensity of the ambient light received by the infrared receiving tube 112 on the edge 102 is XiQ2>m
  • the intensity of the ambient light received by the infrared receiving tube 112 mounted on the third edge 103 is XiQ3>m, then the fourth is terminated.
  • the sixth stage 216 is run.
  • the received ambient light intensity XiQ3 m continues to run the fifth stage 215; the ambient light intensity X i>m received by the infrared receiving tube 112 mounted on the first edge 101 is installed in Light intensity X 103 of the ambient light received by the infrared receiving tube 112 on the third edge 103
  • the intensity Xm of the ambient light received by the upper infrared receiving tube 112, and the intensity of the ambient light XiQ3>m received by the infrared receiving tube 112 mounted on the third edge 103 terminates the fifth stage 215.
  • the sixth stage 216 is operated; the ambient light received by the infrared receiving tube 112 on the first edge 101, the ambient light received by the infrared receiving tube 112 on the first edge 101, and the ambient light received by the infrared receiving tube 112
  • the light intensity XiQ3>m terminates the fifth stage 215 and runs the third stage 213.
  • the light intensity XiQ4 m continues to run the sixth stage 216; the intensity of the ambient light received by the infrared receiving tube 112 mounted on the first edge 101, X i>m, is mounted on the fourth edge 104.
  • the sixth stage 216 When the intensity of the ambient light received by the infrared receiving tube 112 is ⁇ 4 ⁇ m, the sixth stage 216 is terminated, and the third stage 213 is operated; the ambient light received by the infrared receiving tube 112 mounted on the first edge 101
  • the intensity Xim the intensity of the ambient light received by the infrared receiving tube 112 mounted on the fourth edge 104, XiQ4>m, terminates the sixth stage 216, runs the fifth stage 215; as installed at the first edge 101
  • the intensity of the ambient light received by the upper infrared receiving tube 112 is XiQi>m, and the intensity of the ambient light received by the infrared receiving tube 112 mounted on the fourth edge 214 is XiQ4>m, then the sixth stage 216 is terminated. , running the fourth stage 214.
  • the phase management mechanism 107 can be loaded into the microprocessor.
  • the infrared touch screen effectively weakens or eliminates the light caused by the ambient light (such as sunlight) illumination direction and intensity over time and the environment changes to the infrared touch screen. interference.
  • the infrared transmitting tube 111 and the infrared receiving tube 112 on the same edge can be at the same mounting height
  • the infrared transmitting tube 111 on the same edge is shown in FIGS. 5A and 5B.
  • the infrared receiving tube 112 is shown at a different mounting height at the infrared receiving tube 112.
  • the infrared transmitting tube 111 is shown directly above or below the infrared receiving tube 112 in FIG. 5A, and the infrared receiving tube 111 is shown in FIG. 5B as being located at the infrared receiving tube 112.
  • the line connecting the infrared transmitting tube 111 and the infrared receiving tube 112 in FIGS. 5A and 5B is parallel to the touch detecting area 106.
  • the infrared transmitting tube 111 and the lead of the infrared receiving tube 112 are connected to a circuit board 501 mounted inside the edge. In front of the infrared transmitting tube 111 and the infrared receiving tube 112
  • the inner wall 502 (the direction facing the touch detection area 106) may pass infrared light.
  • This installation method can install more infrared transmitting tubes and infrared receiving tubes on the same edge, and then High detection accuracy of infrared touch screen.
  • the two opposite edges selected in FIG. 5A and FIG. 5B are exemplified by the first edge 101 and the second edge 102.

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Description

一种红外触摸屏
技术领域
本发明涉及一种触摸屏， 尤其涉及一种抗光干扰的红外触摸屏。 背景技术
随着科技的发展， 人机交互设备越来越广泛的出现在日常生活当中， 如触摸屏、 电子白板等， 红外触摸屏就是其中的一种。 由于环境光会因 不同的场所、 时间随时发生变化， 这种变化的环境光会对红外触摸屏中 的红外接收管接收与之相对应的红外发射管所发射的红外光造成光干 扰， 影响了红外触摸屏的检测精度， 这个问题急待解决。 发明内容
针对现有技术中存在的问题， 本发明提供了一种抗光干扰的红外触 摸屏， 其特征在于， 包括：
触摸检测区域； 多个边缘， 至少包括第一边缘和第二边缘， 所述第一边缘与所述第 二边缘彼此相对， 在所述第一边缘上安装有红外发射管与红外接收管， 在所述第二边缘上安装有红外发射管与红外接收管； 以及
阶段管理机制， 所述阶段管理机制被配置成： 控制所述红外触摸屏 各个阶段的交替， 所述红外触摸屏具有至少包括第一阶段和第二阶段的 多个阶段；
当处于所述第一阶段时， 所述阶段管理机制控制安装在所述第一边 缘上的红外发射管与安装在所述第二边缘上的红外接收管扫描所述触摸 检测区域； 以及
当处于所述第二阶段时， 所述阶段管理机制控制安装在所述第一边 缘上的红外接收管与安装在所述第二边缘上的红外发射管扫描所述触摸 检测区 i或。
依照本发明的一个方面， 所述多个边缘还包括第三边缘和第四边缘， 所述第三边缘与所述第四边缘相对，在所述第三边缘上安装有红外发射管， 在所述第四边缘上安装有红外接收管。
依照本发明的一个方面， 所述多个边缘还包括第三边缘和第四边缘， 所述第三边缘与所述第四边缘相对，在所述第三边缘上安装有红外接收管， 在所述第四边缘上安装有红外发射管。
依照本发明的一个方面， 在所述阶段管理机制中预设有一个标准环 境光强；
当处于所述第一阶段时， 如安装在所述第二边缘上的红外接收管所 接收到的环境光的光强不大于所述标准环境光强， H 'J所述阶段管理机制 控制所述红外触摸屏继续运行第一阶段； 如安装在所述第二边缘上的红 外接收管所接收到的环境光的光强大于所述标准环境光强， 则所述阶段 管理机制控制所述红外触摸屏终止所述第一阶段， 进入所述第二阶段； 以及
当处于所述第二阶段时， 如安装在所述第一边缘上的红外接收管所 接收到的环境光的光强不大于所述标准环境光强， H 'J所述阶段管理机制 控制所述红外触摸屏继续运行第二阶段； 如安装在所述第一边缘上的红 外接收管所接收到的环境光的光强大于所述标准环境光强， 则所述阶段 管理机制控制所述红外触摸屏终止所述第二阶段， 进入所述第一阶段。
依照本发明的一个方面， 安装在任意一条边缘上的红外发射管所发 射出的红外光能被安装在与该边缘相对的边缘上的至少一个红外接收管 所接收。
依照本发明的一个方面， 同一边缘上的红外发射管与红外接收管的安 装高度不同或相同。
本发明还提供了另外一种红外触摸屏， 包括： 触摸检测区域； 多个边缘， 至少包括第一边缘、 第二边缘、 第三边缘与第四边缘， 所述第一边缘与所述第二边缘彼此相对， 所述第三边缘与所述第四边缘 相对， 在所述第一边缘、 第二边缘、 第三边缘与第四边缘中的每一个上 均安装有红外发射管与红外接收管； 以及
阶段管理机制， 所述阶段管理机制被配置成： 控制所述红外触摸屏 各个阶段的交替， 所述红外触摸屏具有至少包括第三阶段、 第四阶段、 第五阶段和第六阶段的多个阶段；
当处于第三阶段时， 所述阶段管理机制控制安装在所述第一边缘上 的红外发射管与安装在所述第二边缘上的红外接收管扫描所述触摸检测 区域， 控制安装在所述第三边缘上的红外发射管与安装在所述第四边缘 上的红外接收管扫描所述触摸检 'j区域；
当处于第四阶段时， 所述阶段管理机制控制安装在所述第一边缘上 的红外发射管与安装在所述第二边缘上的红外接收管扫描所述触摸检测 区域， 控制安装在所述第三边缘上的红外接收管与安装在所述第四边缘 上的红外发射管扫描所述触摸检测区域；
当处于第五阶段时， 所述阶段管理机制控制安装在所述第一边缘上 的红外接收管与安装在所述第二边缘上的红外发射管扫描所述触摸检测 区域， 控制安装在所述第三边缘上的红外接收管与安装在所述第四边缘 上的红外发射管扫描所述触摸检测区域； 以及
当处于第六阶段时， 所述阶段管理机制控制安装在所述第一边缘上 的红外接收管与安装在所述第二边缘上的红外发射管扫描所述触摸检测 区域， 控制安装在所述第三边缘上的红外发射管与安装在所述第四边缘 上的红外接收管扫描所述触摸检 'j区域。
依照本发明的一个方面， 在所述阶段管理机制中预设有一个标准环 境光强；
当处于第三阶段时， 如安装在第二边缘上的红外接收管所接收到的 环境光的光强不大于标准环境光强， 安装在第四边缘上的红外接收管所 接收到的环境光的光强不大于标准环境光强， H 'J所述阶段管理机制控制 所述红外触摸屏继续运行第三阶段； 如安装在第二边缘上的红外接收管 所接收到的环境光的光强大于标准环境光强， 安装在第四边缘上的红外 接收管所接收到的环境光的光强不大于标准环境光强， H 'J所述阶段管理 机制控制所述红外触摸屏终止第三阶段， 运行第六阶段； 如安装在第二 边缘上的红外接收管所接收到的环境光的光强不大于标准环境光强， 安 装在第四边缘上的红外接收管所接收到的环境光的光强大于标准环境光 强， 则所述阶段管理机制控制所述红外触摸屏终止第三阶段， 运行第四 阶段； 如安装在第二边缘上的红外接收管所接收到的环境光的光强大于 标准环境光强， 安装在第四边缘上的红外接收管所接收到的环境光的光 强大于标准环境光强， 则所述阶段管理机制控制所述红外触摸屏终止第 三阶段， 运行第五阶段；
当处于第四阶段时， 如安装在第二边缘上的红外接收管所接收到的 环境光的光强不大于标准环境光强， 安装在第三边缘上的红外接收管所 接收到的环境光的光强不大于标准环境光强， H 'J所述阶段管理机制控制 所述红外触摸屏继续运行第四阶段； 如安装在第二边缘上的红外接收管 所接收到的环境光的光强大于标准环境光强， 安装在第三边缘上的红外 接收管所接收到的环境光的光强不大于标准环境光强， H 'J所述阶段管理 机制控制所述红外触摸屏终止第四阶段， 运行第五阶段； 如安装在第二 边缘上的红外接收管所接收到的环境光的光强不大于标准环境光强， 安 装在第三边缘上的红外接收管所接收到的环境光的光强大于标准环境光 强， 则所述阶段管理机制控制所述红外触摸屏终止第四阶段， 运行第三 阶段； 如安装在第二边缘上的红外接收管所接收到的环境光的光强大于 标准环境光强， 安装在第三边缘上的红外接收管所接收到的环境光的光 强大于标准环境光强， 则所述阶段管理机制控制所述红外触摸屏终止第 四阶段， 运行第六阶段；
当处于第五阶段时， 如安装在第一边缘上的红外接收管所接收到的 环境光的光强不大于标准环境光强， 安装在第三边缘上的红外接收管所 接收到的环境光的光强不大于标准环境光强， H 'J所述阶段管理机制控制 所述红外触摸屏继续运行第五阶段； 如安装在第一边缘上的红外接收管 所接收到的环境光的光强大于标准环境光强， 安装在第三边缘上的红外 接收管所接收到的环境光的光强不大于标准环境光强， H 'J所述阶段管理 机制控制所述红外触摸屏终止第五阶段， 运行第四阶段； 如安装在第一 边缘上的红外接收管所接收到的环境光的光强不大于标准环境光强， 安 装在第三边缘上的红外接收管所接收到的环境光的光强大于标准环境光 强， 则所述阶段管理机制控制所述红外触摸屏终止第五阶段， 运行第六 阶段； 如安装在第一边缘上的红外接收管所接收到的环境光的光强大于 标准环境光强， 安装在第三边缘上的红外接收管所接收到的环境光的光 强大于标准环境光强， 则所述阶段管理机制控制所述红外触摸屏终止第 五阶段， 运行第三阶段； 以及
当处于第六阶段时， 如安装在第一边缘上的红外接收管所接收到的 环境光的光强不大于标准环境光强， 安装在第四边缘上的红外接收管所 接收到的环境光的光强不大于标准环境光强， H 'J所述阶段管理机制控制 所述红外触摸屏继续运行第六阶段； 如安装在第一边缘上的红外接收管 所接收到的环境光的光强大于标准环境光强， 安装在第四边缘上的红外 接收管所接收到的环境光的光强不大于标准环境光强， H 'J所述阶段管理 机制控制所述红外触摸屏终止第六阶段， 运行第三阶段； 如安装在第一 边缘上的红外接收管所接收到的环境光的光强不大于标准环境光强， 安 装在第四边缘上的红外接收管所接收到的环境光的光强大于标准环境光 强， 则所述阶段管理机制控制所述红外触摸屏终止第六阶段， 运行第五 阶段； 如安装在第一边缘上的红外接收管所接收到的环境光的光强大于 标准环境光强， 安装在第四边缘上的红外接收管所接收到的环境光的光 强大于标准环境光强， 则所述阶段管理机制控制所述红外触摸屏终止第 六阶段， 运行第四阶段。
依照本发明的一个方面， 安装在任意一条边缘上的红外发射管所发 射出的红外光能被安装在与该边缘相对的边缘上的至少一个红外接收管 所接收。
依照本发明的一个方面， 同一边缘上的红外发射管与红外接收管的安 装高度不同或相同。
本发明的其它方面和 /或优点将在下面的说明中部分描述， 并且其中 部分在该说明中是显而易见的， 或者可以通过本发明的实践中学习到。 附图说明
图 1示出了根据本发明原理的一种红外触摸屏的结构筒图； 图 2 示出了图 1中的阶段管理机制控制红外触摸屏中的各个阶段的 状态转换图；
图 3示出了根据本发明原理的另一种红外触摸屏的结构筒图； 图 4示出了图 3中的阶段管理机制控制红外触摸屏中的各个阶段的 状态转换图；
图 5A 示出了根据本发明的红外触摸屏中的红外发射管与红外接收 管一种安装方式的剖面结构图；
图 5B 示出了根据本发明的红外触摸屏中的红外发射管与红外接收 管另一种安装方式的剖面结构图；
图 6示出了图 1中红外触摸屏的触摸定位方法的流程图；
图 7为图 6所示触摸定位方法中用计算触摸物位置坐标的公式的参照 图；
图 8为图 1所示红外触摸屏的一种优化方式的结构筒图；
图 9A为图 8所示红外触摸屏的一种红外光路分布图；
图 9B为图 8所示红外触摸屏的另一种红外光路分布图；
图 9C为图 8所示红外触摸屏的第三种红外光路分布图； 以及 图 9D为图 8所示红外触摸屏的第四种红外光路分布图。
具体实施方式
下面结合说明书附图和具体实施方式对本发明作进一步的描述。 下面将开始本发明的实施例的详细说明， 根据相应的附图说明其实 施例， 其中通篇相同的附图标记指代相同的元件。 下面将通过参照附图 说明实施例以解释本发明。
尽管公知的零件或元件对本发明重要， 但是在下面将不说明或筒要 说明， 只详细地对本发明的特征结构进行描述。
图 1 示出了根据本发明的一个实施例的红外触摸屏 100, 虽然可以 有比所示的更多的边缘， 但是红外触摸屏 100被示为包括两个边缘： 第 一边缘 101与第二边缘 102且第一边缘 101与第二边缘 102相对， 在第 一边缘 101上安装有红外发射管 111与红外接收管 112 ,在第二边缘 102 上同样安装有红外发射管 111 与红外接收管 112。 其中， 安装在第一边 缘 101上的每个红外发射管 111所发射出的红外光能被安装在第二边缘 102 上的至少一个红外接收管 112所接收。 同样， 安装在第二边缘 101 上的每个红外发射管 111所发射出的红外光能被安装在第一边缘 102上 的至少一个红外接收管 112所接收。 这使得红外发射管 111与红外接收 管 112之间的红外光路 105在第一边缘 101与第二边缘 102之间的触摸 检测区域 106 内形成了斜向交叉的红外光阵列。 当触摸物 （如用户的手 指、 手写笔等） 在触摸检测区域 106内发生触击， 就会阻断至少两条红外 光路，而每条红外光路所对应的红外发射管与红外接收管的位置是固定的， 根据相似三角形定理， 很容易就能计算出任意两条斜率不同的被阻断的红 外光路的交点的位置， 该交点的位置即为触摸物的位置， 从而实现了对触 摸物的定位。
如图 6所示为红外触摸屏 100的触摸定位方法的流程图， 红外触摸屏 100实现触摸定位的方法包括以下步骤：
进入步骤 601 , 启动红外触摸屏， 依次选通所有预设的红外光路。 间的红外光路， 在触摸检测区域内形成了交叉的红外光阵列 （或被称为红 外光网格） 。
红外触摸屏 100执行本步骤， 其中第一边缘 101上红外发射管 111的 编号为 ii、 i2、 i3… … in , 第二边缘 102上的红外接收管 112的编号为 η、
Γ2. Γ3 Γη ,依次选通红夕卜光路 i 1 Γρ、 12Γρ+ 1 , 13Γρ+2…… in+ 1 -ρΓη、 iqr 1、 iq+ 1 Γ2、 ΐς+2Γ3... ... inrn+l-q , 在触摸检测区域内形成了交叉的红外光阵列。 其中， n、 p、 q为自 然数且 p<n , q<n。
进入步骤 602, 判断是否有红外光路被阻断， 如无红外光路被阻断， 则返回步骤 601 ; 如有红外光路被阻断， 则记录该被阻断的红外光路。
在步骤 602中， 如无红外光路被阻断， 则说明在触摸检测区域内未存 有触摸物， 则返回步骤 601 , 重新依次选通所有红外光路， 检测整个触摸 检测区域； 如有红外光路被阻断， 则说明在触摸检测区域内存有触摸物， 具体地， 红外触摸屏 100如下执行本步骤， 如红外触摸屏在依次选通 红夕卜光路 iirp、 Ϊ2Γρ+1 , 13Γρ+2…… in+l-prn、 ΐςΠ , iq+ir2、 ΐς+2Γ3…… inrn+1-q时没有红 外光路被阻断， 则返回步骤 601 ; 如红外光路 i3rP+2、 iq+4r5被阻断， 则记 录红外光路 i3rP+2、 iq+4r5所对应的红外发射管 i3、 iq+4、 红外接收管 rP+2、 rs 的坐标。 进入步骤 603, 计算被阻断的红外光路之间的交点的坐标， 该交点的 坐标即为触摸物的坐标， 并把坐标数据送到计算机中进行处理。
参照图 7, 在步骤 603中， 从步骤 601 中所获取的被阻断的红外光路 中选取任意两条被阻断的红外光路 AC、 BD, 其中， 被阻断的红外光路 AC 所对应的红外发射管 A 的内部坐标为 （m, a) , 所对应的红外接收管 C 的内部坐标为 （n, c) ； 被阻断的红外光路 BD所对应的红外发射管 B的 内部坐标为 （m, b) , 所对应的红外接收管 D的内部坐标为 （n, d) 。 同 时需要满足 c-"≠d-b , 即 AC与 BD相交。 将步骤中所得到的被阻挡的红 外光路所对应的红外发射管与红外接收管的坐标 A (m, a) 、 C (n, c) 、 B (m, b ) 、 D (n, d) 代入公式
an— bn + md― mc
x =
a-b + d - c
ad - be
y= ^
a-b； ~ - ~
+ a -c
就可以计算出被阻断的红外光路 AC与 BD之间的交点 0的内部坐标 ( X, y) 。 为了减少计算量， 提高响应速度， 可令 m=0。 即红外发射管 所在的直线被设置成 y轴。 同时令公式中的 n=h, h为红外发射管所在直 线与红外接收管所在直线之间的间距。 从而， 此公式筒化为
a-b Ί
χ = η
a-b + d - c
ad - be
a— b + d -c
然后将计算得到的交点 o的坐标数据也就是触摸物的坐标数据（x, y ) 送到计算机中进行处理， 并对触摸操作做出响应。
具体地， 红外触摸屏 100如下执行本步骤： 将红外发射管 i3(0, 3)、 iq+4 ( 0, q+4 )、 与红外接收管 rp+2 ( h, p+2 ) 、 r5 ( h, 5) 的坐标代入公式 a-b Ί
x = η
a-b + d - c
ad - be
a—b+d -c 计算得出 y= + 4)(Ρ + 2)_15 , 然后将该坐标 p+q-2 p+q-2 ( ^—h , (g + 4)(P + 2) "15 )送到计算机中进行处理, 并对触摸操作做出 p + q - 2 p + q - 2 响应。 在实际应用中， 环境光对红外触摸屏所造成的光干扰主要为来自东 西方向的太阳光的光干扰， 所以可将红外触摸屏 100的第一边缘 101相 对于第二边缘 102 东西朝向放置， 进一步降低光干扰。 同时为了进一步 增加红外触摸屏 100的检测精度， 如图 8所示， 可令红外触摸屏 100具 有第三边缘 103与第四边缘 104 , 第三边缘 103与第四边缘 104相对， 在 第三边缘 103上安装有红外发射管 111 , 在第四边缘 104上安装有红外接 收管 112。 安装在第三边缘 103上的任意一个红外发射管 111所发射出的 红外光能够被安装在第四边缘 104上的至少一个红外接收管 112所接收。 其中， 安装在第三边缘 103 上的红外发射管 111 可全部换成红外接收管 112, 与此相对应， 可将安装在第四边缘 104上的所有红外接收管 112全部 换成红外发射管 111。 图 8 中所示的红外触摸屏中的红外光路可被设置成 如图 9A、 图 9B、 图 9C、 图 9D中任意一种所示的红外光路分布图。
在红外触摸屏 100中还包括能够控制红外触摸屏 100在各个阶段之 间交替操作的阶段管理机制 107。 图 2示出了红外触摸屏 100 中的阶段 管理机制 107的示例性操作的状态图 200。 在状态 201 中， 阶段管理机 制 107等待红外触摸屏下一阶段的改变， 并且实际上当时机合适时控制 下一阶段改变。 虽然红外触摸屏 100可以具有更多的阶段， 但是在图 2 中被示为只具有第一阶段 211与第二阶段 212这两个阶段。 当转换到第 一阶段 211时， 阶段管理机制 107控制安装在第一边缘 101上的红外发 射管 111与安装在第二边缘 102上的红外接收管 112扫描触摸检测区域 106; 当转换到第二阶段 212时， 阶段管理机制 107控制安装在第一边缘 101上的红外接收管 112与安装在第二边缘 102上的红外发射管 111扫 描触摸检测区域 106。
在红外触摸屏 100的阶段管理机制 107 中预设有一个标准环境光强 m, 当红外接收管 112所接收到的环境光的光强 X不大于所述标准环境光 强 m (即 X m ) 时， 此时的环境光不会影响红外接收管接收与其所对应 的红外发射管所发射的红外光。 阶段管理机制 107可以将时时监测得到的 红外发射管 104所接收到的环境光的光强 X与标准环境光强 m进行比较来 控制阶段交替。 当处于第一阶段 211 时， 如安装在第二边缘 102上的红 外接收管 112 所接收到的环境光的光强 XiQ2 m, 则阶段管理机制 107 控制红外触摸屏 100继续运行第一阶段 211。 如安装在第二边缘 102上 的红外接收管 112所接收到的环境光的光强 XiQ2>m,则阶段管理机制 107 控制红外触摸屏 100终止第一阶段 211 , 进入第二阶段 212; 当处于第二 阶段 212时， 如安装在第一边缘 101上的红外接收管 112所接收到的环 境光的光强 X i m,则阶段管理机制 107控制红外触摸屏 100继续运行 第二阶段 212。 如安装在第一边缘 101上的红外接收管 112所接收到的 环境光的光强 XiQi>m, 则阶段管理机制 107控制红外触摸屏 100终止第 二阶段 212 , 进入第一阶段 211。 即， 如果当前接收红外光的当前接收边 缘上安装的红外接收管 112所接收到的环境光的光强大于预设的标准环 境光强， 就改变红外触摸屏所处的阶段， 由当前接收边缘上安装的红外 发射管和与当前接收边缘相对的边缘上安装的红外接收管扫描触摸检测 区域 106。 在实际应用中， 阶段管理机制 107可加载到微处理器中。 这 种红外触摸屏通过这种结构上的改变及阶段管理机制的应用， 有效地削 弱或消除了因环境光 （如太阳光） 光照方向及强度随时间、 环境随时发 生变化对红外触摸屏所造成的光干扰。
图 3 示出了根据本发明的另一个实施例的红外触摸屏 300 , 虽然可 以有比所示的更多的边缘， 但是红外触摸屏 300被示为包括四条边缘： 第一边缘 101、 第二边缘 102、 第三边缘 103和第四边缘 104 , 第一边缘 101与第二边缘 102相对， 第三边缘 103与第四边缘 104相对， 在每个 边缘上都同时安装有红外发射管 111 与红外接收管 112。 其中， 安装在 任意一条边缘上的红外发射管 111所发射出的红外光能被安装在与该边 缘相对边缘上的至少一个红外接收管 112所接收。这使得红外发射管 111 与红外接收管 112之间的红外光路 105在位于四条边缘中间的触摸检测 区域 106 内形成了能够检测触摸物位置的斜向交叉或十字交叉的红外光 阵列。 作为一种优选， 安装在任意一条边缘上的红外发射管 111所发射 出的红外光在图 3 中被示为能被安装在与该边缘相对边缘上的一个红外 接收管 112所接收， 红外发射管 111与红外接收管 112之间的红外光路 105在位于四条边缘中间的触摸检测区域 106 内在图 3 中被示为形成了 能够检测触摸物位置的十字交叉的红外光阵列， 这种结构的红外触摸屏 具有更高的检测精度。 红外触摸屏 300中同样具有能够控制红外触摸屏 300在各个阶段之 间交替操作的阶段管理机制 107。 图 4示出了红外触摸屏 300 中的阶段 管理机制 107的示例性操作的状态图 400。 虽然红外触摸屏 300可以具 有更多的阶段，但是在图 4中被示为只具有第三阶段 213、第四阶段 214、 第五阶段 215及第六阶段 216这四个阶段。 在状态 201 中， 阶段管理机 制 107等待红外触摸屏 300下一阶段的改变， 并且实际上当时机合适时 控制下一阶段改变。 当转换到第三阶段 213时，控制安装在第一边缘 101 上的红外发射管 111与安装在第二边缘 102上的红外接收管 112扫描触 摸检测区域 106 , 控制安装在第三边缘 103上的红外发射管 111 与安装 在第四边缘上的红外接收管 112扫描触摸检测区域 106; 当处于第四阶 段 214时， 控制安装在第一边缘 101上的红外发射管 111与安装在第二 边缘 102上的红外接收管 112扫描触摸检测区域 106 , 控制安装在第三 边缘 103上的红外接收管 112与安装在第四边缘 104上的红外发射管 111 扫描触摸检测区域 106; 当处于第五阶段 215 时， 控制安装在第一边缘 101上的红外接收管 112与安装在第二边缘 102上的红外发射管 111扫 描触摸检测区域 106 , 控制安装在第三边缘 103上的红外接收管 112与 安装在第四边缘 104上的红外发射管 111扫描触摸检测区域 106; 当处 于第六阶段 216时， 控制安装在第一边缘 101上的红外接收管 112与安 装在第二边缘 102上的红外发射管 111扫描触摸检测区域 106 , 控制安 装在第三边缘 103上的红外发射管 111与安装在第四边缘 104上的红外 接收管 112扫描触摸检测区域 106。 也就是说， 红外触摸屏 300在阶段 管理机制 107的控制下， 选择第一边缘和第二边缘中的一个作为发射边 缘， 另一边缘作为接收边缘， 同时选择第三边缘和第四边缘中的一个作 为发射边缘， 另一边缘作为接收边缘， 由此组合形成不同阶段。
同时在红外触摸屏 300的阶段管理机制 107 中同样预设有一个标准 环境光强 m, 当红外接收管 112所接收到的环境光的光强 X不大于所述标 准环境光强 m (即 X m ) 时， 此时的环境光不会影响红外接收管接收与 其所对应的红外发射管所发射的红外光。 阶段管理机制 107可以将时时监 测得到的红外发射管 104所接收到的环境光的光强 X与标准环境光强 m进 行比较来控制阶段交替。 如果当前接收边缘中的至少一个上安装的红外 接收管 112所接收到的环境光的光强大于预设的标准环境光强， 就改变 红外触摸屏所处的阶段， 使得对于每个这样的接收边缘， 由该接收边缘 上安装的红外发射管和与该接收边缘相对的边缘上安装的红外接收管扫 描触摸检测区域 106。
具体地， 当处于第三阶段 213时， 如安装在第二边缘 102上的红外 接收管 112所接收到的环境光的光强 XiQ2 m,安装在第四边缘 104上的 红外接收管 112所接收到的环境光的光强 XiQ4 m,则继续运行第三阶段 213 ;如安装在第二边缘 102上的红外接收管 112所接收到的环境光的光 强 XiQ2>m, 安装在第四边缘 104上的红外接收管 112所接收到的环境光 的光强 XiQ4 m, 则终止第三阶段 213 , 运行第六阶段 216; 如安装在第 二边缘 102上的红外接收管 112所接收到的环境光的光强 XiQ2 m,安装 在第四边缘 104上的红外接收管 112所接收到的环境光的光强 XiQ4>m, 则终止第三阶段 213 , 运行第四阶段 214; 如安装在第二边缘 102上的红 外接收管 112所接收到的环境光的光强 XiQ2>m, 安装在第四边缘 104上 的红外接收管 112 所接收到的环境光的光强 XiQ4>m, 则终止第三阶段 213 , 运行第五阶段 215。
当处于第四阶段 214时，如安装在第二边缘 102上的红外接收管 112 所接收到的环境光的光强 XiQ2 m,安装在第三边缘 103上的红外接收管 112所接收到的环境光的光强 XiQ3 m, 则继续运行第四阶段 214; 如安 装在第二边缘 102上的红外接收管 112所接收到的环境光的光强 XiQ2>m, 安装在第三边缘 103上的红外接收管 112所接收到的环境光的光强 X103 < m, 则终止第四阶段 214 , 运行第五阶段 215 ; 如安装在第二边缘 102 上的红外接收管 112所接收到的环境光的光强 X 2 m,安装在第三边缘 103上的红外接收管 112所接收到的环境光的光强 XiQ3>m, 则终止第四 阶段 214 , 运行第三阶段 213 ; 如安装在第二边缘 102 上的红外接收管 112所接收到的环境光的光强 XiQ2>m, 安装在第三边缘 103上的红外接 收管 112所接收到的环境光的光强 XiQ3>m, 则终止第四阶段 214 , 运行 第六阶段 216。
当处于第五阶段 215时，如安装在第一边缘 101上的红外接收管 112 所接收到的环境光的光强 X i m,安装在第三边缘 103上的红外接收管
112所接收到的环境光的光强 XiQ3 m, 则继续运行第五阶段 215 ; 如安 装在第一边缘 101上的红外接收管 112所接收到的环境光的光强 X i>m, 安装在第三边缘 103上的红外接收管 112所接收到的环境光的光强 X103
< m, 则终止第五阶段 215 , 运行第四阶段 214; 如安装在第一边缘 101 上的红外接收管 112所接收到的环境光的光强 X m,安装在第三边缘 103上的红外接收管 112所接收到的环境光的光强 XiQ3>m, 则终止第五 阶段 215 , 运行第六阶段 216; 如安装在第一边缘 101 上的红外接收管 112所接收到的环境光的光强 XiQi>m, 安装在第三边缘 103上的红外接 收管 112所接收到的环境光的光强 XiQ3>m, 则终止第五阶段 215 , 运行 第三阶段 213。
当处于第六阶段 216时，如安装在第一边缘 101上的红外接收管 112 所接收到的环境光的光强 X i m,安装在第四边缘 104上的红外接收管 112所接收到的环境光的光强 XiQ4 m, 则继续运行第六阶段 216; 如安 装在第一边缘 101上的红外接收管 112所接收到的环境光的光强 X i>m, 安装在第四边缘 104上的红外接收管 112所接收到的环境光的光强 Χιο4 < m, 则终止第六阶段 216 , 运行第三阶段 213 ; 如安装在第一边缘 101 上的红外接收管 112所接收到的环境光的光强 X i m,安装在第四边缘 104上的红外接收管 112所接收到的环境光的光强 XiQ4>m, 则终止第六 阶段 216 , 运行第五阶段 215 ; 如安装在第一边缘 101 上的红外接收管 112所接收到的环境光的光强 XiQi>m, 安装在第四边缘 214上的红外接 收管 112所接收到的环境光的光强 XiQ4>m, 则终止第六阶段 216 , 运行 第四阶段 214。
在实际应用中， 阶段管理机制 107可加载到微处理器中。 这种红外 触摸屏通过这种结构上的改变及阶段管理机制的应用， 有效地削弱或消 除了因环境光 （如太阳光） 光照方向及强度随时间、 环境随时发生变化 对红外触摸屏所造成的光干扰。
在红外触摸屏 100与红外触摸屏 300中， 虽然同一边缘上的红外发 射管 111与红外接收管 112可处同一安装高度， 但在图 5A与图 5B中被 示为同一边缘上的红外发射管 111与红外接收管 112处不同安装高度， 红外发射管 111在图 5A中被示为位于红外接收管 112的正上方或正下方， 红外接收管 111在图 5B中被示为位于红外接收管 112的斜上方或斜下方， 在图 5A与图 5B中通过红外发射管 111与红外接收管 112的连线都平行于 触摸检测区域 106。红外发射管 111与红外接收管 112的引线连接到安装 在边缘内部的电路板 501上。 在红外发射管 111与红外接收管 112前方
(面向触摸检测区域 106的方向） 的内壁 502可通过红外光。 这种安装 方式可以在同一边缘上安装有更多的红外发射管与红外接收管， 进而提 高了红外触摸屏的检测精度。 其中， 在图 5A与图 5B中选取的两条相对 的边缘以第一边缘 101与第二边缘 102为示例。
尽管已经对本发明的实施例作出了较为详细的说明和描述， 但是本 领域的技术人员应该明了在没有脱离本发明精神和原则的情况下可以对 这些实施例进行改变， 其范围定义在权利要求中。

Claims

权利要求
1. 一种红外触摸屏， 其特征在于， 包括： 触摸检测区域； 多个边缘， 至少包括第一边缘和第二边缘， 所述第一边缘与所述第 二边缘彼此相对， 在所述第一边缘上安装有红外发射管与红外接收管， 在所述第二边缘上安装有红外发射管与红外接收管； 以及
阶段管理机制， 所述阶段管理机制被配置成： 控制所述红外触摸屏 各个阶段的交替， 所述红外触摸屏具有至少包括第一阶段和第二阶段的 多个阶段；
当处于所述第一阶段时， 所述阶段管理机制控制安装在所述第一边 缘上的红外发射管与安装在所述第二边缘上的红外接收管扫描所述触摸 检测区域； 以及
当处于所述第二阶段时， 所述阶段管理机制控制安装在所述第一边 缘上的红外接收管与安装在所述第二边缘上的红外发射管扫描所述触摸 检测区 i或。
2. 如权利要求 1所述的红外触摸屏， 其特征在于： 所述多个边缘还包 括第三边缘和第四边缘， 所述第三边缘与所述第四边缘相对， 在所述第三 边缘上安装有红外发射管， 在所述第四边缘上安装有红外接收管。
3. 如权利要求 1所述的红外触摸屏， 其特征在于： 所述多个边缘还包 括第三边缘和第四边缘， 所述第三边缘与所述第四边缘相对， 在所述第三 边缘上安装有红外接收管， 在所述第四边缘上安装有红外发射管。
4. 如权利要求 1至 3之一所述的红外触摸屏， 其特征在于： 在所述阶 段管理机制中预设有一个标准环境光强； 当处于所述第一阶段时， 如安装在所述第二边缘上的红外接收管所 接收到的环境光的光强不大于所述标准环境光强， H 'J所述阶段管理机制 控制所述红外触摸屏继续运行第一阶段； 如安装在所述第二边缘上的红 外接收管所接收到的环境光的光强大于所述标准环境光强， 则所述阶段 管理机制控制所述红外触摸屏终止所述第一阶段， 进入所述第二阶段； 以及 当处于所述第二阶段时， 如安装在所述第一边缘上的红外接收管所 接收到的环境光的光强不大于所述标准环境光强， H 'J所述阶段管理机制 控制所述红外触摸屏继续运行第二阶段； 如安装在所述第一边缘上的红 外接收管所接收到的环境光的光强大于所述标准环境光强， 则所述阶段 管理机制控制所述红外触摸屏终止所述第二阶段， 进入所述第一阶段。
5. 如权利要求 4所述的红外触摸屏， 其特征在于： 安装在任意一条边 缘上的红外发射管所发射出的红外光能被安装在与该边缘相对的边缘上 的至少一个红外接收管所接收。
6. 如权利要求 5所述的红外触摸屏， 其特征在于： 同一边缘上的红外 发射管与红外接收管的安装高度不同或相同。
7. 一种红外触摸屏， 其特征在于， 包括： 触摸检测区域； 多个边缘， 至少包括第一边缘、 第二边缘、 第三边缘与第四边缘， 所述第一边缘与所述第二边缘彼此相对， 所述第三边缘与所述第四边缘 相对， 在所述第一边缘、 第二边缘、 第三边缘与第四边缘的每一个上均 安装有红外发射管与红外接收管； 以及
阶段管理机制， 所述阶段管理机制被配置成： 控制所述红外触摸屏 各个阶段的交替， 所述红外触摸屏具有至少包括第三阶段、 第四阶段、 第五阶段和第六阶段的多个阶段；
当处于第三阶段时， 所述阶段管理机制控制安装在所述第一边缘上 的红外发射管与安装在所述第二边缘上的红外接收管扫描所述触摸检测 区域， 控制安装在所述第三边缘上的红外发射管与安装在所述第四边缘 上的红外接收管扫描所述触摸检 'j区域；
当处于第四阶段时， 所述阶段管理机制控制安装在所述第一边缘上 的红外发射管与安装在所述第二边缘上的红外接收管扫描所述触摸检测 区域， 控制安装在所述第三边缘上的红外接收管与安装在所述第四边缘 上的红外发射管扫描所述触摸检测区域；
当处于第五阶段时， 所述阶段管理机制控制安装在所述第一边缘上 的红外接收管与安装在所述第二边缘上的红外发射管扫描所述触摸检测 区域， 控制安装在所述第三边缘上的红外接收管与安装在所述第四边缘 上的红外发射管扫描所述触摸检测区域； 以及
当处于第六阶段时， 所述阶段管理机制控制安装在所述第一边缘上 的红外接收管与安装在所述第二边缘上的红外发射管扫描所述触摸检测 区域， 控制安装在所述第三边缘上的红外发射管与安装在所述第四边缘 上的红外接收管扫描所述触摸检 'j区域。
8. 如权利要求 7所述的红外触摸屏， 其特征在于： 在所述阶段管理机 制中预设有一个标准环境光强；
如果当前接收边缘中的至少一个上的红外接收管所接收到的环境光 的光强大于标准环境光强， 所述阶段管理机制就改变红外触摸屏所处的 阶段， 使得对于每个这样的接收边缘， 由该接收边缘上的红外发射管和 与该接收边缘相对的边缘上的红外接收管扫描触摸检测区域。
9. 如权利要求 8所述的红外触摸屏， 其特征在于： 当处于第三阶段时， 如安装在第二边缘上的红外接收管所接收到的 环境光的光强不大于标准环境光强， 安装在第四边缘上的红外接收管所 接收到的环境光的光强不大于标准环境光强， H 'J所述阶段管理机制控制 所述红外触摸屏继续运行第三阶段； 如安装在第二边缘上的红外接收管 所接收到的环境光的光强大于标准环境光强， 安装在第四边缘上的红外 接收管所接收到的环境光的光强不大于标准环境光强， H 'J所述阶段管理 机制控制所述红外触摸屏终止第三阶段， 运行第六阶段； 如安装在第二 边缘上的红外接收管所接收到的环境光的光强不大于标准环境光强， 安 装在第四边缘上的红外接收管所接收到的环境光的光强大于标准环境光 强， 则所述阶段管理机制控制所述红外触摸屏终止第三阶段， 运行第四 阶段； 如安装在第二边缘上的红外接收管所接收到的环境光的光强大于 标准环境光强， 安装在第四边缘上的红外接收管所接收到的环境光的光 强大于标准环境光强， 则所述阶段管理机制控制所述红外触摸屏终止第 三阶段， 运行第五阶段；
当处于第四阶段时， 如安装在第二边缘上的红外接收管所接收到的 环境光的光强不大于标准环境光强， 安装在第三边缘上的红外接收管所 接收到的环境光的光强不大于标准环境光强， H 'J所述阶段管理机制控制 所述红外触摸屏继续运行第四阶段； 如安装在第二边缘上的红外接收管 所接收到的环境光的光强大于标准环境光强， 安装在第三边缘上的红外 接收管所接收到的环境光的光强不大于标准环境光强， H 'J所述阶段管理 机制控制所述红外触摸屏终止第四阶段， 运行第五阶段； 如安装在第二 边缘上的红外接收管所接收到的环境光的光强不大于标准环境光强， 安 装在第三边缘上的红外接收管所接收到的环境光的光强大于标准环境光 强， 则所述阶段管理机制控制所述红外触摸屏终止第四阶段， 运行第三 阶段； 如安装在第二边缘上的红外接收管所接收到的环境光的光强大于 标准环境光强， 安装在第三边缘上的红外接收管所接收到的环境光的光 强大于标准环境光强， 则所述阶段管理机制控制所述红外触摸屏终止第 四阶段， 运行第六阶段；
当处于第五阶段时， 如安装在第一边缘上的红外接收管所接收到的 环境光的光强不大于标准环境光强， 安装在第三边缘上的红外接收管所 接收到的环境光的光强不大于标准环境光强， H 'J所述阶段管理机制控制 所述红外触摸屏继续运行第五阶段； 如安装在第一边缘上的红外接收管 所接收到的环境光的光强大于标准环境光强， 安装在第三边缘上的红外 接收管所接收到的环境光的光强不大于标准环境光强， H 'J所述阶段管理 机制控制所述红外触摸屏终止第五阶段， 运行第四阶段； 如安装在第一 边缘上的红外接收管所接收到的环境光的光强不大于标准环境光强， 安 装在第三边缘上的红外接收管所接收到的环境光的光强大于标准环境光 强， 则所述阶段管理机制控制所述红外触摸屏终止第五阶段， 运行第六 阶段； 如安装在第一边缘上的红外接收管所接收到的环境光的光强大于 标准环境光强， 安装在第三边缘上的红外接收管所接收到的环境光的光 强大于标准环境光强， 则所述阶段管理机制控制所述红外触摸屏终止第 五阶段， 运行第三阶段； 以及
当处于第六阶段时， 如安装在第一边缘上的红外接收管所接收到的 环境光的光强不大于标准环境光强， 安装在第四边缘上的红外接收管所 接收到的环境光的光强不大于标准环境光强， H 'J所述阶段管理机制控制 所述红外触摸屏继续运行第六阶段； 如安装在第一边缘上的红外接收管 所接收到的环境光的光强大于标准环境光强， 安装在第四边缘上的红外 接收管所接收到的环境光的光强不大于标准环境光强， H 'J所述阶段管理 机制控制所述红外触摸屏终止第六阶段， 运行第三阶段； 如安装在第一 边缘上的红外接收管所接收到的环境光的光强不大于标准环境光强， 安 装在第四边缘上的红外接收管所接收到的环境光的光强大于标准环境光 强， 则所述阶段管理机制控制所述红外触摸屏终止第六阶段， 运行第五 阶段； 如安装在第一边缘上的红外接收管所接收到的环境光的光强大于 标准环境光强， 安装在第四边缘上的红外接收管所接收到的环境光的光 强大于标准环境光强， 则所述阶段管理机制控制所述红外触摸屏终止第 六阶段， 运行第四阶段。
10.如权利要求 7或 8所述的红外触摸屏， 其特征在于： 安装在任意一 条边缘上的红外发射管所发射出的红外光能被安装在与该边缘相对的边 缘上的至少一个红外接收管所接收。
11.如权利要求 9所述的红外触摸屏， 其特征在于： 同一边缘上的红外 发射管与红外接收管的安装高度不同或相同。
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