WO2009038277A1 - Resistive touch screen which can identify multi-touch - Google Patents

Resistive touch screen which can identify multi-touch Download PDF

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Publication number
WO2009038277A1
WO2009038277A1 PCT/KR2008/003638 KR2008003638W WO2009038277A1 WO 2009038277 A1 WO2009038277 A1 WO 2009038277A1 KR 2008003638 W KR2008003638 W KR 2008003638W WO 2009038277 A1 WO2009038277 A1 WO 2009038277A1
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WO
WIPO (PCT)
Prior art keywords
resistive
detection pattern
touch screen
touch
resistive detection
Prior art date
Application number
PCT/KR2008/003638
Other languages
French (fr)
Inventor
Minsung Yang
Original Assignee
Ad Semicondictor Co., Ltd.
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 Ad Semicondictor Co., Ltd. filed Critical Ad Semicondictor Co., Ltd.
Publication of WO2009038277A1 publication Critical patent/WO2009038277A1/en

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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
    • G06F3/045—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
    • 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
    • G06F2203/04104—Multi-touch detection in digitiser, i.e. details about the simultaneous detection of a plurality of touching locations, e.g. multiple fingers or pen and finger

Definitions

  • the present invention relates to a resistive touch screen, and more particularly to a resistive touch screen which can identify a multi-touch.
  • FIG. 1 is a diagram for explaining a conventional resistive touch screen.
  • a lower transparent film 20 and an upper transparent film 30 are stacked on an insulating film 10.
  • ITO resistive films 20a and 30a are formed on the upper surface of the lower transparent film 20 and the lower surface of the upper transparent film 30, respectively.
  • Electrodes 20b and 30b, to which voltages are applied, are disposed at opposite ends of the ITO resistive films 20a and 30a, respectively.
  • the Y-axis electrodes 20b disposed on the lower transparent film 20 and the X-axis electrodes 30b disposed on the upper transparent film 30 are arranged to be orthogonal to each other.
  • the present invention has been made in view of the above problems, and it is an object of the present invention to provide a resistive touch screen which can identify a multi-touch.
  • a resistive touch screen capable of identifying a multi-touch comprising: an insulating film; a lower transparent film stacked on the insulating film; an upper transparent film stacked on the lower transparent film; a first resistive detection pattern which is formed on the lower transparent film and has a plurality of stripes arranged in parallel; a second resistive detection pattern which is formed on the upper transparent film and has a plurality of stripes arranged in parallel, wherein the first resistive detection pattern and the second resistive detection pattern cross each other perpendicularly; first electrodes disposed at opposite ends of the stripes of the first resistive detection pattern; second electrodes disposed at opposite ends of the stripes of the second resistive detection pattern; and a coordinate identification unit which applies voltages to the first electrodes and the second electrodes and reads voltages of a touched portion in which a touch is made to obtain X and Y coordinates.
  • the first resistive detection pattern is disposed on an upper surface of the lower transparent film, and the second resistive detection pattern is disposed on a lower surface of the upper transparent film.
  • the first resistive detection pattern and the second resistive detection pattern are formed as transparent conductive films.
  • the coordinate identification unit alternately applies voltages to only stripes related to the touched portion among the stripes of the first resistive detection pattern and the second resistive detection pattern to obtain X and Y coordinates.
  • the coordinate identification unit detects a position variation to a voltage variation occurring when a touch position varies in an area where the first resistive detection pattern and the second resistive detection pattern cross each other in the touched portion.
  • FIG. 1 is a diagram for explaining a conventional resistive touch screen
  • FIG. 2 illustrates a diagram for explaining a resistive touch screen capable of identifying a multi-touch according to the present invention
  • FIG. 3 is a top view of Fig. 2.
  • FIG. 2 illustrates a diagram for explaining a resistive touch screen capable of identifying a multi-touch according to the present invention.
  • a lower transparent film 200 and an upper transparent film 300 are stacked on an insulating film 100.
  • a Y-axis transparent resistive detection pattern 200a is formed on the upper surface of the lower transparent film 200, and an X-axis transparent resistive detection pattern 300a is formed on the lower surface of the upper transparent film 300.
  • the transparent resistive detection patterns 200a and 300a may be formed as ITO films as in the conventional case. However, in a different way from the conventional case, a single film has a plurality of stripes.
  • the Y-axis transparent resistive detection pattern 200a and the X-axis transparent resistive detection pattern 300a are arranged to be orthogonal to each other while the stripes form rows and columns therein.
  • Y-axis electrodes 200b and X-axis electrodes 300b are formed at opposite ends of the stripes of the transparent resistive detection patterns 200a and 300a, respectively.
  • the electrodes 200b and 300b may employ silver ink.
  • FIG. 3 is a top view of Fig. 2, which shows only the transparent resistive detection patterns 200a and 300a and the electrodes 200b and 300b in order to explain an advantage of the present invention capable of identifying a multi-touch differently from the conventional case.
  • the delta V represents a voltage variation occurring when a position of a point A varies in an area in which an X2-axis intersects a Yl -axis.
  • the maximum delta V does not exceed VDD * (1/6) in X-axis, and the maximum delta V does not exceed VDD * (1/9) in Y-axis.
  • positions of points C, D and E can be independently represented by the above-described method.
  • the point C is represented by a general matrix method, the point C cannot be detected if the point C is touched in a state where the points A and D are touched.
  • the point C can be independently detected in the present invention.
  • the voltage value represents a Y coordinate value.
  • the voltage value represents a Y coordinate value.
  • F and G exist in a portion in which X5 column intersects Y7 row in the transparent resistive detection patterns 200a and 300a. This problem may be solved by further dividing the rows and columns of the transparent resistive detection patterns 200a and 300a. It is preferable to minimize distances between the rows and between the columns of the transparent resistive detection patterns 200a and 300a within a range capable of maintaining insulation of the ITO serving as a transparent conductive thin film.
  • the vertical structure of the touch screen according to the present invention has the same structure as the structure of the conventional resistive touch screen. Accordingly, in addition to fingers, all tools, for example, a stylus pen, a card and a nail, which can be used for the conventional resistive touch screen, can be used to touch the touch screen according to the present invention.
  • an identification circuit for reading coordinate values of the touch screen similarly to the conventional method for reading coordinate values of the conventional resistive touch screen, voltages are applied to only the column and the row related to the area in which a touch is made to read the coordinates. Accordingly, it is possible to prevent a waste of time and power. Particularly, in order to minimize battery consumption in a mobile device, standby power should be minimized.
  • a multi-touch cannot be identified in the conventional resistive touch screen, according to the present invention, it is possible to provide a touch screen capable of identifying a multi-touch which while maintaining all advantages of the conventional resistive touch screen.

Abstract

A resistive touch screen which can identify a multi-touch is disclosed. A first resistive detection pattern and a second resistive detection pattern having a plurality of parallel stripes are arranged to be orthogonal to each other, and voltage are alternately applied to only stripes related to a touched portion among the stripes of the first resistive detection pattern and the second resistive detection pattern to obtain X and Y coordinates. Although only one touch point is identified in a conventional case, it is possible to provide a touch screen capable of identifying a multi-touch which cannot be identified in the conventional resistive touch screen.

Description

Description
RESISTIVE TOUCH SCREEN WHICH CAN IDENTIFY MULTI- TOUCH
Technical Field
[1] The present invention relates to a resistive touch screen, and more particularly to a resistive touch screen which can identify a multi-touch.
[2]
Background Art
[3] FIG. 1 is a diagram for explaining a conventional resistive touch screen. A lower transparent film 20 and an upper transparent film 30 are stacked on an insulating film 10. ITO resistive films 20a and 30a are formed on the upper surface of the lower transparent film 20 and the lower surface of the upper transparent film 30, respectively. Electrodes 20b and 30b, to which voltages are applied, are disposed at opposite ends of the ITO resistive films 20a and 30a, respectively. The Y-axis electrodes 20b disposed on the lower transparent film 20 and the X-axis electrodes 30b disposed on the upper transparent film 30 are arranged to be orthogonal to each other.
[4] If a touch is made on the ITO resistive films 20a and 30a, voltages are detected at a touch point by alternately applying voltages to the X-axis electrodes 30b and the Y- axis electrodes 20b, thereby obtaining X and Y coordinates. However, since the conventional method can identify only one touch at a time, it has a problem that a multi- touch cannot be identified.
[5]
Disclosure of Invention Technical Problem
[6] Therefore, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a resistive touch screen which can identify a multi-touch.
[7]
Technical Solution
[8] In accordance with an aspect of the present invention, the above and other objects can be accomplished by the provision of a resistive touch screen capable of identifying a multi-touch comprising: an insulating film; a lower transparent film stacked on the insulating film; an upper transparent film stacked on the lower transparent film; a first resistive detection pattern which is formed on the lower transparent film and has a plurality of stripes arranged in parallel; a second resistive detection pattern which is formed on the upper transparent film and has a plurality of stripes arranged in parallel, wherein the first resistive detection pattern and the second resistive detection pattern cross each other perpendicularly; first electrodes disposed at opposite ends of the stripes of the first resistive detection pattern; second electrodes disposed at opposite ends of the stripes of the second resistive detection pattern; and a coordinate identification unit which applies voltages to the first electrodes and the second electrodes and reads voltages of a touched portion in which a touch is made to obtain X and Y coordinates.
[9] Preferably, the first resistive detection pattern is disposed on an upper surface of the lower transparent film, and the second resistive detection pattern is disposed on a lower surface of the upper transparent film. Preferably, the first resistive detection pattern and the second resistive detection pattern are formed as transparent conductive films.
[10] Preferably, the coordinate identification unit alternately applies voltages to only stripes related to the touched portion among the stripes of the first resistive detection pattern and the second resistive detection pattern to obtain X and Y coordinates.
[11] Preferably, the coordinate identification unit detects a position variation to a voltage variation occurring when a touch position varies in an area where the first resistive detection pattern and the second resistive detection pattern cross each other in the touched portion.
[12]
Advantageous Effects
[13] In the conventional resistive touch screen, only one touch point can be identified.
However, as described above, according to the present invention, it is possible to provide a touch screen capable of identifying a multi-touch which while maintaining all advantages of the conventional resistive touch screen.
[14]
Brief Description of the Drawings
[15] The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
[16] FIG. 1 is a diagram for explaining a conventional resistive touch screen;
[17] Fig. 2 illustrates a diagram for explaining a resistive touch screen capable of identifying a multi-touch according to the present invention; and
[18] Fig. 3 is a top view of Fig. 2.
[19]
Best Mode for Carrying Out the Invention
[20] Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. [21] Fig. 2 illustrates a diagram for explaining a resistive touch screen capable of identifying a multi-touch according to the present invention. A lower transparent film 200 and an upper transparent film 300 are stacked on an insulating film 100. A Y-axis transparent resistive detection pattern 200a is formed on the upper surface of the lower transparent film 200, and an X-axis transparent resistive detection pattern 300a is formed on the lower surface of the upper transparent film 300.
[22] The transparent resistive detection patterns 200a and 300a may be formed as ITO films as in the conventional case. However, in a different way from the conventional case, a single film has a plurality of stripes. The Y-axis transparent resistive detection pattern 200a and the X-axis transparent resistive detection pattern 300a are arranged to be orthogonal to each other while the stripes form rows and columns therein. Y-axis electrodes 200b and X-axis electrodes 300b are formed at opposite ends of the stripes of the transparent resistive detection patterns 200a and 300a, respectively. The electrodes 200b and 300b may employ silver ink.
[23] Fig. 3 is a top view of Fig. 2, which shows only the transparent resistive detection patterns 200a and 300a and the electrodes 200b and 300b in order to explain an advantage of the present invention capable of identifying a multi-touch differently from the conventional case.
[24]
[25] [Coordinates of point A]
[26] After VDD is applied to Yl+ and GND is applied to Yl-, a voltage is detected at
X2+ (or X2-), and the voltage value represents an X coordinate value.
[27] That is, X coordinate voltage = VDD * (1/6) + delta V = X coordinate value
[28] After VDD is applied to X2+ and GND is applied to X2-, a voltage is detected at
Yl+ (or Yl-), and the voltage value represents a Y coordinate value.
[29] That is, Y coordinate voltage = VDD * (8/9) + delta V = Y coordinate value
[30] In this case, the delta V represents a voltage variation occurring when a position of a point A varies in an area in which an X2-axis intersects a Yl -axis. The maximum delta V does not exceed VDD * (1/6) in X-axis, and the maximum delta V does not exceed VDD * (1/9) in Y-axis.
[31] In a case where a touch position varies in an area in which the Y-axis transparent resistive detection pattern 200a intersects the X-axis transparent resistive detection pattern 300a, the magnitude of the delta V varies. Accordingly, it is possible to obtain an accurate touch position even in the area in which the Y-axis transparent resistive detection pattern 200a intersects the X-axis transparent resistive detection pattern 300a by measuring the variation of the delta V.
[32]
[33] [Coordinates of point B] [34] After VDD is applied to Yl+ and GND is applied to Yl-, a voltage is detected at
X4+ (or X4-) and X5+ (or X5-) to obtain a first average value, and after VDD is applied to Y2+ and GND is applied to Y2-, a voltage is detected at X4+ (or X4-) and X5+ (or X5-) to obtain a second average value. Then, an average value of the first average value and the second average value is obtained again, and the average voltage value represents an X coordinate value.
[35] After VDD is applied to X4+ and GND is applied to X4-, a voltage is detected at
Yl+ (or Yl-) and Y2+ (or Y2-) to obtain a first average value, and after VDD is applied to X5+ and GND is applied to X5-, a voltage is detected at Yl+ (or Yl-) and Y2+ (or Y2-) to obtain a second average value. Then, an average value of the first average value and the second average value is obtained again, and the average voltage value represents a Y coordinate value.
[36] Similarly, positions of points C, D and E can be independently represented by the above-described method. Particularly, when the point C is represented by a general matrix method, the point C cannot be detected if the point C is touched in a state where the points A and D are touched. However, the point C can be independently detected in the present invention.
[37]
[38] [Coordinates of point C]
[39] After VDD is applied to Y5+ and GND is applied to Y5-, a voltage is detected at
X2+ (or X2-), and the voltage value represents an X coordinate value.
[40] That is, X coordinate voltage = VDD * (1/6) + delta V = X coordinate value
[41] After VDD is applied to X2+ and GND is applied to X2-, a voltage is detected at
Y5+ (or Y5-), and the voltage value represents a Y coordinate value.
[42] That is, Y coordinate voltage = VDD * (4/9) + delta V = Y coordinate value
[43]
[44] [Coordinates of point D]
[45] After VDD is applied to Y5+ and GND is applied to Y5-, a voltage is detected at
X6+ (or X6-), and the voltage value represents an X coordinate value.
[46] That is, X coordinate voltage = VDD * (5/6) + delta V = X coordinate value
[47] After VDD is applied to X6+ and GND is applied to X6-, a voltage is detected at
Y5+ (or Y5-), and the voltage value represents a Y coordinate value.
[48] That is, Y coordinate voltage = VDD * (4/9) + delta V = Y coordinate value
[49]
[50] [Coordinates of points F and G]
[51] Points F and G cannot be identified independently. As for the reason, both the points
F and G exist in a portion in which X5 column intersects Y7 row in the transparent resistive detection patterns 200a and 300a. This problem may be solved by further dividing the rows and columns of the transparent resistive detection patterns 200a and 300a. It is preferable to minimize distances between the rows and between the columns of the transparent resistive detection patterns 200a and 300a within a range capable of maintaining insulation of the ITO serving as a transparent conductive thin film.
[52] The vertical structure of the touch screen according to the present invention has the same structure as the structure of the conventional resistive touch screen. Accordingly, in addition to fingers, all tools, for example, a stylus pen, a card and a nail, which can be used for the conventional resistive touch screen, can be used to touch the touch screen according to the present invention.
[53] In an identification circuit for reading coordinate values of the touch screen according to the present invention, similarly to the conventional method for reading coordinate values of the conventional resistive touch screen, voltages are applied to only the column and the row related to the area in which a touch is made to read the coordinates. Accordingly, it is possible to prevent a waste of time and power. Particularly, in order to minimize battery consumption in a mobile device, standby power should be minimized. Although a multi-touch cannot be identified in the conventional resistive touch screen, according to the present invention, it is possible to provide a touch screen capable of identifying a multi-touch which while maintaining all advantages of the conventional resistive touch screen.
[54] Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims

Claims
[1] A resistive touch screen capable of identifying a multi-touch comprising: an insulating film; a lower transparent film stacked on the insulating film; an upper transparent film stacked on the lower transparent film; a first resistive detection pattern which is formed on the lower transparent film and has a plurality of stripes arranged in parallel; a second resistive detection pattern which is formed on the upper transparent film and has a plurality of stripes arranged in parallel, wherein the first resistive detection pattern and the second resistive detection pattern cross each other perpendicularly; first electrodes disposed at opposite ends of the stripes of the first resistive detection pattern; second electrodes disposed at opposite ends of the stripes of the second resistive detection pattern; and a coordinate identification unit which applies voltages to the first electrodes and the second electrodes and reads voltages of a touched portion in which a touch is made to obtain X and Y coordinates.
[2] The resistive touch screen according to claim 1, wherein the first resistive detection pattern is disposed on an upper surface of the lower transparent film.
[3] The resistive touch screen according to claim 1, wherein the second resistive detection pattern is disposed on a lower surface of the upper transparent film.
[4] The resistive touch screen according to claim 1, wherein the first resistive detection pattern and the second resistive detection pattern are formed as transparent conductive films.
[5] The resistive touch screen according to claim 1, wherein the first electrodes and the second electrodes are formed using silver ink.
[6] The resistive touch screen according to claim 1, wherein the coordinate identification unit alternately applies voltages to only stripes related to the touched portion among the stripes of the first resistive detection pattern and the second resistive detection pattern to obtain X and Y coordinates.
[7] The resistive touch screen according to claim 1, wherein the coordinate identification unit detects a position variation to a voltage variation occurring when a touch position varies in an area where the first resistive detection pattern and the second resistive detection pattern cross each other in the touched portion.
PCT/KR2008/003638 2007-09-17 2008-06-25 Resistive touch screen which can identify multi-touch WO2009038277A1 (en)

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KR10-2007-0094198 2007-09-17

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EP2811381A1 (en) 2013-06-05 2014-12-10 Spreadtrum Communications (Shanghai) Co., Ltd. Touch detection method and device

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TWI402730B (en) * 2009-09-30 2013-07-21 晶宏半導體股份有限公司 Control module of touch module
TWI412983B (en) * 2010-01-21 2013-10-21 Detecting method of performing multi-touch on a capacitive touch panel
TWI499962B (en) * 2010-03-03 2015-09-11 Mobile Technology Corp I Resistive multi-touch panel and coordinate detecting method thereof
US8217809B2 (en) * 2010-06-22 2012-07-10 Microsoft Corporation Low power sensing via resistive sensor matrix
TWI450177B (en) * 2011-02-11 2014-08-21 Wintek Corp Resistive touch control device and compensating voltage determining method

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