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WO2008130145A1 - Appareil à écran tactile et procédé associé faisant intervenir un laser et des fibres optiques - Google Patents

Appareil à écran tactile et procédé associé faisant intervenir un laser et des fibres optiques Download PDF

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Publication number
WO2008130145A1
WO2008130145A1 PCT/KR2008/002189 KR2008002189W WO2008130145A1 WO 2008130145 A1 WO2008130145 A1 WO 2008130145A1 KR 2008002189 W KR2008002189 W KR 2008002189W WO 2008130145 A1 WO2008130145 A1 WO 2008130145A1
Authority
WO
WIPO (PCT)
Prior art keywords
screen
laser beams
touch
optical fibers
pattern
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/KR2008/002189
Other languages
English (en)
Inventor
Chul-Un Kim
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZETHOS CO Ltd
Original Assignee
ZETHOS 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 ZETHOS CO Ltd filed Critical ZETHOS CO Ltd
Publication of WO2008130145A1 publication Critical patent/WO2008130145A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/042—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 OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers

Definitions

  • the present invention relates to a touch-screen apparatus using a laser, optical fibers, and an image sensor, and more particularly, to a touch-screen apparatus for detecting from which position of a display screen laser beams are blocked, by radially projecting laser beams from a side of the display screen, in parallel with a surface of the display screen, receiving the laser beams from another side of the display screen by using a plurality of optical fibers, and photographing and processing a pattern image of an emission pattern that is formed by the optical fibers, by using an imaging sensor.
  • a touch-screen apparatus directly senses and selects a position of a pointing means such as a cursor, a prompt, or an icon, on a display screen.
  • the touch-screen apparatus is used in laptop computers, various measuring devices, compact personal computers (i.e., personal digital assistants (PDAs) and personal multimedia players (PMPs)), mobile phones, and the like.
  • PDAs personal digital assistants
  • PMPs personal multimedia players
  • a conventional touch-screen apparatus senses whether the finger or the pen is disposed at certain coordinates which are set on the display unit.
  • the conventional touch-screen apparatus senses a position of the blocking object by detecting coordinates of the blocking object on the display screen in a digital method, or physically senses motion of the blocking object in an analog method.
  • An example of the conventional touch-screen apparatus is a digital touch-screen in which coordinates are set by horizontally and vertically dividing a display screen, independently disposing a light emission source or a light reception sensor on each of horizontal and vertical axes of each coordinate, and sensing a position of a blocking object such as a finger, from each coordinate.
  • PSR pressure sensitive resistor
  • the PSR is opaque and thus may not be applied to a display unit. Also, in consideration of technology and expense, it is disadvantageous to apply the PSR to large-scale display screens. Furthermore, if the PSR is used in a monitor screen, the
  • PSR covers the monitor screen and thus clarity of the monitor screen may deteriorate and a contact surface may be easily damaged due to repeated use.
  • FIG. 1 is a structural view of a touch-screen apparatus according to an embodiment of the present invention
  • FIG. 2 is an exemplary view of a device for arranging optical fibers, according to an embodiment of the present invention
  • FIG. 3 is an exemplary view of a captured pattern image of an emission pattern according to an embodiment of the present invention.
  • FIG. 4 is a flowchart of a method of searching for a position where a blocking object contacts on a screen, according to an embodiment of the present invention
  • FIG. 5 is a structural view of a touch-screen apparatus according to another embodiment of the present invention
  • FIG. 6 is a diagram for describing operation of the touch-screen apparatus illustrated in FIG. 5, according to an embodiment of the present invention.
  • FIG. 7 is a diagram showing an actual arrangement of optical fibers, according to an embodiment of the present invention.
  • the present invention provides a touch-screen apparatus for detecting from which position of a display screen laser beams are blocked, by radially projecting laser beams from a side of the display screen, in parallel with a surface of the display screen, receiving the laser beams from another side of the display screen by using optical fibers, and capturing and processing a pattern image of an emission pattern that is formed by the optical fibers, by using an imaging sensor.
  • a touch-screen according to the present invention may have a greatly improved resolving power which is weak in a conventional touch-screen, and may be applied to large-scale screens such as electronic blackboards or whiteboards.
  • a touch-screen according to the present invention may use laser beams and an image sensor, may have a greatly improved touch resolving power in comparison to a conventional touch-screen, and may be easily implemented in large-scale screens.
  • the touch-screen may not deteriorate clarity of a display image, by being mounted without covering a conventional display screen, and, unlike a conventional touch-screen, may be unaffected by temperature and humidity.
  • the touch-screen may be integrally formed with a monitor without any difficulties.
  • the touch-screen may be externally mounted on previously sold monitors in aftermarkets.
  • a touch-screen apparatus for searching for a position where a blocking object such as a finger or a pen contacts a screen.
  • the touch-screen apparatus may include at least one laser beam source which is disposed on a side of the screen and projects laser beams in parallel with a surface of the screen; a plurality of optical fibers which are disposed on another side of the screen, of which incidence units receive the laser beams projected from the laser beam source, through which the laser beams are transmitted, and of which emission units emit the laser beams and form an emission pattern; an image sensor which captures a pattern image of the emission pattern; and a signal processor which analyzes the pattern image and determines a position where the laser beams are not incident on the optical fibers due to the blocking object disposed on the screen.
  • a method of searching for a position where a blocking object such as a finger or a pen contacts a screen.
  • the method may include projecting laser beams from a side of the screen, in parallel with a surface of the screen; receiving the laser beams from another side of the screen by using a plurality of optical fibers, and emitting the laser beams from emission units of the optical fibers so as to form a predetermined emission pattern; capturing a pattern image of the laser beams which are emitted in the emission pattern; and analyzing the pattern image and determining the position of the blocking object which blocks the laser beams from being incident on the optical fibers.
  • the laser beam source may be an invisible beam source.
  • the laser beam source may be disposed at a corner of the screen and may project the laser beams in parallel with the surface of the screen.
  • the incidence units of the optical fibers may be arranged in a row on a side which is opposite to the laser beam source of the screen.
  • the emission pattern may be formed in a matrix shape having a rectangular region.
  • the image sensor may be a semiconductor imaging device such as a charge-coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS).
  • CCD charge-coupled device
  • CMOS complementary metal-oxide semiconductor
  • the signal processor may search for coordinates of the blocking object by analyzing the coordinates of a black dot in a matrix shape of the pattern image received from the image sensor.
  • FIG. 1 is a structural view of a touch-screen apparatus according to an embodiment of the present invention.
  • the touch-screen apparatus includes a screen 10 and a blocking object such as a finger or a pen is disposed on the screen 10. That is, the present invention provides a technique for automatically detecting a position of a blocking object and using a value of the position for various purposes.
  • the present invention may be used in various applications such as a pointing apparatus which detects a position of a pointer on a black board and displays the position on a PC monitor, so as to select a function, or a graphical user interface (GUI) apparatus which is disposed on a monitor of a computer or a display screen of a kiosk, to directly select a functional menu of an application program, on a screen.
  • GUI graphical user interface
  • At least one laser beam source 14 is disposed at a corner of the screen 10.
  • the laser beam source 14 radially projects laser beams 16 in parallel with a surface of the screen 10.
  • the laser beam source 14 is disposed at a left-top corner of the screen 10 and projects the laser beams 16 in a diagonal direction of the screen 10.
  • the laser beam source 14 may be an invisible beam source.
  • a plurality of optical fibers 18 are arranged on sides which are opposite to neighboring sides of the corner at which the laser beam source 14 is disposed.
  • the laser beams 16 projected from the laser beam source 14 are incident on incidence units 18' of the optical fibers 18 which are arranged on the sides which are opposite to the laser beam source 14, the laser beams 16 are transmitted through the optical fibers 18, and emission units 18" emit the laser beams 16.
  • the emission units 18" of the optical fibers 18 form a predetermined emission pattern 24.
  • the incidence units 18' of the optical fibers 18 are arranged in a row on horizontal and vertical sides which are opposite to the laser beam source 14 of the screen 10.
  • a device illustrated in FIG. 2 may be used.
  • FIG. 2 is an exemplary view of a device for arranging the optical fibers 18 illustrated in FIG. 1 , according to an embodiment of the present invention. FIG. 2 will be described in conjunction with FIG. 1.
  • optical fiber fixing grooves 28 having a semi-circular shape are formed on a side of a long optical fiber arranging bar 26 to be attached to a side of the screen 10.
  • the optical fibers 18 are attached on the optical fiber fixing grooves 28 and then the optical fiber arranging bar 26 is attached to a side of the screen 10. As such, the optical fibers 18 are easily and firmly attached to the screen 10.
  • the emission pattern 24 is formed by the emission units 18" in the form of a matrix including lines and rows which correspond to the horizontal and vertical sides which are opposite to the laser beam source 14.
  • an image sensor 30 captures an pattern image of the emission pattern 24.
  • a semiconductor imaging device such as a charge-coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS) may be used as the image sensor 30.
  • CMOS complementary metal-oxide semiconductor
  • a signal processor 32 analyzes a pattern image of the emission pattern 24, which is captured by the image sensor 30. Due to a fact that the emission units 18" of the optical fibers 18 are uniformly arranged in the form of a matrix, the pattern image of the emission pattern 24 may be easily signal-processed.
  • FIG. 3 is an exemplary view of the emission pattern 24 illustrated in FIG. 1 , according to an embodiment of the present invention.
  • the black dots 34 are formed by a shadow of a blocking object that is disposed at a position corresponding to the black dots 34.
  • coordinates of the blocking object may be detected by detecting horizontal and vertical positions of optical fibers corresponding to the coordinates of the black dots 34.
  • FIG. 4 is a flowchart of a method of detecting a position of a blocking object that is disposed on a touch-screen apparatus, according to an embodiment of the present invention.
  • the method includes radially projecting laser beams from a side of a screen, in parallel with a surface of the screen, in operation 100; receiving the laser beams from another side of the screen by using a plurality of optical fibers, and emitting the laser beams from emission units of the optical fibers so as to form a predetermined emission pattern, in operation 200; capturing a pattern image of the laser beams which are emitted in the emission pattern, in operation 300; and analyzing the pattern image and determining the position of the blocking object which blocks the laser beams from being incident on the optical fibers, in operation 400.
  • Detailed descriptions of the method correspond to the descriptions of the touch-screen apparatus above and thus will be omitted here. Specific embodiments of the present invention will now be described in detail.
  • FIG. 5 is a structural view of a touch-screen apparatus according to another embodiment of the present invention.
  • a goal of the present invention may be sufficiently achieved by using a single laser beam source as illustrated in FIG. 1.
  • FIG. 1 only a position of a blocking object may be detected.
  • a structure as illustrated in FIG. 5 is more preferable.
  • first and second laser beam sources 36a and 36b are disposed at two neighboring corners of a screen. Except for a side that is connected to both of the first and second laser beam sources 36a and 36b, optical fibers are arranged on the other three sides such as first through third sides 38a, 38b, and 38c. One set of ends of the optical fibers which are arranged on the first through third sides 38a, 38b, and 38c respectively form first through third emission patterns 40a, 40b, and 40c.
  • laser beams projected from the second laser beam source 36b that is opposite to the first side 38a are incident on optical fibers which are arranged on the first side 38a
  • laser beams projected from the first laser beam source 36a that is opposite to the third side 38c are incident on optical fibers which are arranged on the third side 38c.
  • Laser beams projected from the first and second laser beam sources 36a and 36b are incident on optical fibers which are arranged on the second side 38b.
  • a pattern image of the first through third emission patterns 40a, 40b, and 40c which are respectively formed by the one set of ends of the optical fibers of the first through third sides 38a, 38b, and 38c, is captured by one image sensor (not shown) or three exclusive image sensors (not shown), and pattern images of the first through third emission patterns 40a, 40b, and 40c are analyzed.
  • a size and a shape of the blocking object may also be analyzed.
  • each position, size, and shape of multiple blocking objects may be analyzed also.
  • FIG. 6 is a diagram for describing a method of analyzing the first through third emission patterns 40a, 40b, and 40c illustrated in FIG. 5, according to an embodiment of the present invention.
  • FIG. 6 shows a case when a position of a blocking object 42 is indicated by only the first and second emission patterns 40a and 40b and is not indicated by the third emission patterns 40c (that is, a case when an image of a shadow of the blocking object 42 is captured from two emission patterns).
  • the blocking object 42 may be disposed at a position where the image of the shadow of the blocking object 42 is captured from all three emission patterns, or an image of two shadows of two blocking objects may be captured from one emission pattern.
  • the signal processor 32 illustrated in FIG. 1 analyzes captured pattern images of the first through third emission patterns 40a, 40b, and 40c, searches for positions of black dots (the shadow of the blocking object 42), and searches for positions of optical fibers 44 and 46 corresponding to the positions of the black dots.
  • a position of each optical fiber that is disposed adjacent to an edge of a screen, is preset data.
  • a size of a blocking object may also be detected because, if the size of the blocking objects is large, the size of a shadow of the blocking object is large and thus the number of black dots of emission patterns increases.
  • a shape of the blocking object may also be detected because the shape of the black dots of the emission patterns corresponds to the shape of the blocking object. Due to the fact that sizes, shapes, and positions of multiple blocking objects as well as a size, a shape, and a position of a blocking object may be detected, a touch-screen apparatus according to an embodiment of the present invention may be used in various applications including multi-point display apparatuses.
  • FIG. 7 is a diagram showing an actual arrangement of optical fibers, according to an embodiment of the present invention.
  • An incidence unit of an optical fiber characteristically has an incidence angle such that a laser beam that is slantingly incident over a predetermined angle based on a perpendicular line of an incidence surface of the optical fiber, may not be incident on the optical fiber.
  • an incidence angle such that a laser beam that is slantingly incident over a predetermined angle based on a perpendicular line of an incidence surface of the optical fiber, may not be incident on the optical fiber.
  • the optical fibers may be slantingly arranged on the screen so that an incidence surface of each optical fiber is perpendicular to a laser beam as much as possible.
  • optical fibers of first and third sides 38a and 38c are slantingly arranged so as to be almost perpendicular to second and first laser beam sources 36b and 36a, respectively.
  • Optical fibers of a second side 38b need to receive laser beams from both of the first and second laser beam sources 36a and 36b and thus are divided into three groups 18a, 18b, and 18c which are differently set from each other.
  • the positions of the two laser beam sources are random.
  • the two laser beam sources may be disposed at two corners which are adjacent to a short side of a screen. As such, laser beams may be incident on all the optical fibers.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Position Input By Displaying (AREA)

Abstract

L'invention concerne un appareil à écran tactile faisant intervenir un laser, des fibres optiques, et un capteur d'image pour détecter à partir de quelle position les faisceaux laser d'un écran d'affichage sont bloqués, par projection radiale de faisceaux laser depuis un côté de l'écran d'affichage, parallèlement à une surface de l'écran d'affichage qui reçoit les faisceaux laser depuis un autre côté de l'écran d'affichage par une pluralité de fibres optiques, et qui capture et traite une image de motif d'un motif d'émission formé par les fibres optiques à l'aide d'un capteur d'image. Un appareil à écran tactile selon un mode de réalisation de l'invention comprend au moins une source de faisceaux laser qui est située sur un côté de l'écran et qui projette des faisceaux laser parallèlement à une surface de l'écran; une pluralité de fibres optiques qui sont disposées sur un autre côté de l'écran dont les unités d'incidence reçoivent les faisceaux laser projetés depuis la source de faisceaux laser par laquelle sont transmis les faisceaux laser et dont les unités d'émission émettent des faisceaux laser pour former un motif d'émission; un capteur d'image qui capture une image de motif du motif d'émission; et un processeur de signal qui analyse l'image de motif et qui détermine une position pour laquelle les faisceaux laser ne sont pas incidents sur les fibres optiques en raison de la présence d'un objet disposé sur l'écran qui bloque les faisceaux laser.
PCT/KR2008/002189 2007-04-20 2008-04-18 Appareil à écran tactile et procédé associé faisant intervenir un laser et des fibres optiques Ceased WO2008130145A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2007-0038804 2007-04-20
KR1020070038804A KR100816087B1 (ko) 2007-04-20 2007-04-20 레이저와 광섬유를 이용한 터치스크린 장치 및 방법

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WO2008130145A1 true WO2008130145A1 (fr) 2008-10-30

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PCT/KR2008/002189 Ceased WO2008130145A1 (fr) 2007-04-20 2008-04-18 Appareil à écran tactile et procédé associé faisant intervenir un laser et des fibres optiques

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KR (1) KR100816087B1 (fr)
WO (1) WO2008130145A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012025159A1 (fr) * 2010-08-27 2012-03-01 Brainlab Ag Détermination de position de pointage multicouche sur un écran médical

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100985180B1 (ko) * 2007-11-07 2010-10-05 휴텍정보 주식회사 광 장식수단을 갖춘 키오스크
KR20100102774A (ko) 2009-03-12 2010-09-27 삼성전자주식회사 터치 감지 시스템 및 이를 채용한 디스플레이 장치
KR101296722B1 (ko) * 2010-11-24 2013-08-20 최도현 광섬유를 이용한 터치스크린 장치
KR20120073763A (ko) 2010-12-27 2012-07-05 삼성전자주식회사 표시장치

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5764223A (en) * 1995-06-07 1998-06-09 International Business Machines Corporation Touch-screen input device using the monitor as a light source operating at an intermediate frequency
US20030160155A1 (en) * 2001-10-09 2003-08-28 Liess Martin Dieter Device having touch sensitivity functionality
US20060066584A1 (en) * 2004-09-30 2006-03-30 Edward Barkan Optical touch screen arrangement
US20070084989A1 (en) * 2003-09-22 2007-04-19 Koninklijke Philips Electronics N.V. Light guide touch screen

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100297920B1 (ko) * 1997-11-07 2001-10-24 김태정 집중된빛의조사에의한화면상의절대좌표입력장치

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5764223A (en) * 1995-06-07 1998-06-09 International Business Machines Corporation Touch-screen input device using the monitor as a light source operating at an intermediate frequency
US20030160155A1 (en) * 2001-10-09 2003-08-28 Liess Martin Dieter Device having touch sensitivity functionality
US20070084989A1 (en) * 2003-09-22 2007-04-19 Koninklijke Philips Electronics N.V. Light guide touch screen
US20060066584A1 (en) * 2004-09-30 2006-03-30 Edward Barkan Optical touch screen arrangement

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012025159A1 (fr) * 2010-08-27 2012-03-01 Brainlab Ag Détermination de position de pointage multicouche sur un écran médical

Also Published As

Publication number Publication date
KR100816087B1 (ko) 2008-03-24
KR20070054607A (ko) 2007-05-29

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