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WO1989001677A1 - Systeme de saisie de donnees a ecran tactile - Google Patents

Systeme de saisie de donnees a ecran tactile Download PDF

Info

Publication number
WO1989001677A1
WO1989001677A1 PCT/US1987/002073 US8702073W WO8901677A1 WO 1989001677 A1 WO1989001677 A1 WO 1989001677A1 US 8702073 W US8702073 W US 8702073W WO 8901677 A1 WO8901677 A1 WO 8901677A1
Authority
WO
WIPO (PCT)
Prior art keywords
photo
touch screen
input system
signal
pointer
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/US1987/002073
Other languages
English (en)
Inventor
Langdon R. Wales
H. W. Crowley
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to EP19870905859 priority Critical patent/EP0377558A4/en
Priority to PCT/US1987/002073 priority patent/WO1989001677A1/fr
Publication of WO1989001677A1 publication Critical patent/WO1989001677A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • G06F3/0428—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
    • 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
    • G06F3/033—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor
    • G06F3/037—Pointing devices displaced or positioned by the user, e.g. mice, trackballs, pens or joysticks; Accessories therefor using the raster scan of a cathode-ray tube [CRT] for detecting the position of the member, e.g. light pens cooperating with CRT monitors
    • 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

Definitions

  • the present invention relates in general to a touch screen input system. More particularly, the invention relates to a novel technique for detecting the location of an object and in particular, a pointer or possibly the human finger as associated with a display device such as a cathode ray tube (CRT).
  • a display device such as a cathode ray tube (CRT).
  • Another object of the present invention is to provide an improved touch screen input system which employs a minimum number of components and yet provides good detection resolution.
  • Still a further object of the present invention is to provide an improved touch screen input system that is not subject to deterioration with normal use.
  • Still another object of the present invention is to provide a touch screen input system in which there is no requirement for any special purpose pen or pointer.
  • even a standard graphite pencil may be used as a pointer.
  • a touch screen input system for use with a display screen having a photo-active display surface including a controllable sweeping beam.
  • a preferred display is a CRT display which employs the standard type of raster scan.
  • the photo-detector means is adapted for placement so as to receive light from the region immediately adjacent the display surface.
  • a pointer means is provided which may actually be the operator's finger, or some type of selection pen.
  • the detection circuitry includes means for continuously registering the position of the beam in the display surface, which circuitry is responsive to the latch signal, and means for continuously registering, for holding, a signal that, identifies the display screen location corresponding to the pointer means location.
  • multiple photo-cells such as four photo-cells, one at each corner of the CRT display directed all converging toward the CRT display.
  • the photo-detectors are preferably connected in parallel to the input of a high-gain AC-coupled amplifier.
  • the means for continuously registering position may comprise a set of counters which have counts coincidental with the X and Y locations of the beam on the CRT. At the moment of detecting an impulse of light from the pointer means, the output values of the counters are held, with the X and Y coordinates thereof indicative of pointer means position on the display surface.
  • a method of detection of a pointer means location on a display screen such as a CRT screen.
  • This method comprises the steps of providing photo detection means adapted to detect the reflection of light from the pointer means, providing a continuous registration of location of the sweeping beam on the CRT surface and, upon detection of the light impulse at the photo-detector, holding the registered values corresponding to pointer means location.
  • FIG. 1 illustrates a CRT display with associated scan line signal
  • FIG.2 illustrates the CRT display also and the associated placement of the photo-detectors
  • FIG. 3 is a perspective view of a photo-cell or photo-detector as used in FIG. 2;
  • FIG. 4 is a side elevation view showing the placement of the photo-cell relative to the CRT surface and also illustrating the selection pen;
  • FIG. 5 is a block diagram of a part of the detection circuit of the present invention including the muixipie photo-detectors and amplifier;
  • FIG. 6 is a block diagram illustrating the remainder of the detection circuitry for providing X and Y position locations of the selection pen.
  • FIGS. 1-6 describes a new technique for detecting the location of an object such as a pointer, selection pen, or even a finger of the human hand on a display screen such as a cathode ray tube (CRT) display.
  • a display screen such as a cathode ray tube (CRT) display.
  • a finger or any other object when touched to a CRT display surface, is illuminated by that portion of the screen that is excited by the beam as it travels past.
  • the beam traces a distinctive pattern from the top to the bottom of the screen, sweeping all of the screen area.
  • the beam is typically intensity-modulated to produce different characters or images on the screen.
  • the finger or selection pen is placed on top of or adjacent to the characters or images, a portion of the tip of the finger or of the selection pen is illuminated whenever the beam excites those characters or images.
  • the illumination is detected by one or more photo-detectors on the edges of the screen.
  • four such photo-detectors are used, one at each corner of the screen.
  • FIG. 1 simply illustrates a cathode ray tube 10 with its display screen or face 12.
  • a series of scan lines 14 On the tube face, there are illustrated a series of scan lines 14 and also illustrated in FIG. 1 is a scan signal 16.
  • the segment of the line 14 illustrated in FIG. 1 corresponds to the length of the pulse illustrated in connection with the scan line signal 16.
  • the sweeping electron beam operates on the basis of a raster scan in which horizontal sweeps occur at a predetermined rate. When a horizontal sweep is completed, then the beam retraces and commences again with a subsequent horizontal sweep at a slightly lower vertical position. This horizontal sweeping action continues until the entire screen has been swept.
  • FIG. 2 also illustrates the CRT screen 12 and illustrates the further principle in accordance with the present invention of employing photo-cells.
  • FIG.2 there are shown four photo-cells 20, each properly supported at a corner of the screen.
  • FIG. 3 shows a simple perspective view of one of the photo-cells 20.
  • FIG. 4 illustrates a bezel support 22 which is used to support each of the photo-cells at a corner of the CRT screen 12.
  • Various types of support may be provided for the photo-cell.
  • the photo-cell 20 is to be arranged so that its viewing area 21 is directed toward the center of the CRT screen and so that its field of view is substantially 90°.
  • FIG. 3 there is found a photocell, plastic support housing and photocell lens.
  • FIG. 2 it is noted that there are illustrated on the face of the screen, a series of dots 24 which may represent points on the screen that are to be selected by the selection pen 26.
  • the pen 26 need not be of any special design. No wires are coupled from the pen. The pen is used only for the purpose of providing a reflecting surface so that light at the dot 24A in FIG. 2 is reflected by the selection pen 26 in the direction of the dotted lines 25 illustrated in FIG. 2. These dotted lines 25 simply illustrate a direction of light as it is reflected toward each of the photo-cells 20.
  • a plurality of photo-cells are preferably used to ensure that the field of view is not totally blocked and that the entire screen is covered.
  • the principles of the invention are applied in a most simplified version in connection with the use of only a single photo-cell.
  • the light that progresses along the paths 25 occurs only at the predetermined point in the raster scan where the dot 24A is illuminated.
  • the dot 24A appears to be always illuminated , but in actuality, it is illuminated at a fast repetition rate and during a single complete screen scan. It is illuminated only when the beam is at the X and Y coordinate corresponding to the dot 24A position.
  • the detection signal should be received at each of the photo-cells during the time when the image is illuminated by the beam.
  • FIG. 5 shows the four photo-cells 20 illustrated in block form in FIG. 5. All of these photo-cells are connected in parallel to the common line 30 and from there by way of AC-coupling capacitor 32 to the high gain amplifier 34.
  • the output of the amplifier 34 is referred to as the scan signal, also referred to hereinafter in connection with the circuitry of FIG. 6.
  • the purpose of the amplifier 34 is to amplify the signal from the photo-detectors.
  • the signal from the photo-detectors is typically a few milli-volts and the amplifier 34 amplifies the signal to a digital logic level, typically say, 5 volts for the "on" condition.
  • the purpose of the AC coupling by means of the illustrated capacitor 32 is to reject ambient stray light and to take advantage of the fact that the beam is scanning across the CRT at a known frequency, and therefore, the response of the amplifier can be matched to optimize the signal with respect to noise.
  • Amplifier 34 may also provide other signal processing operations, such as signal clipping, pulse shaping and threshold detection.
  • FIG. 6 shows the counting circuitry associated with the CRT display.
  • a horizontal counter 40 and a vertical counter 42 Associated with the horizontal counter 40 is a data latch 44.
  • a data latch 46 At the output of the latch 44 there is shown an output line 48 that gives the X position on the CRT screen.
  • an output at 50 which gives the Y position of the CRT screen.
  • the horizontal counter 40 has a clock input at 41 and a reset input at line 43.
  • This clock signal at line 41 is the horizontal character clock signal that provides increments of the horizontal scan, on a character basis with the output of the counter 40 being a binary signal representative of the particular horizontal position along a particular scan line. This allows you to be synchronized with the characters selected by the pointer means.
  • the output of the counter 40 is continuously fed to the latch 44, but the latch 44 operates to latch a particular count only when the signal on line 52 occurs.
  • the signal on line 52 is a detection signal that comes from the photo-detectors as illustrated in FIG. 5.
  • the horizontal sync signal couples by way of line 43 for resetting the horizontal counter.
  • This signal also couples as a clock input to the vertical counter 42.
  • the vertical counter 42 is reset from the vertical sync signal coupled to the vertical counter at line 45.
  • the vertical counter 42 also couples to the data latch 46 and the output signals from the vertical counter 42 are binary signals representative of one of the particular scan lines that is presently being scanned by the beam.
  • the latch 46 continuously receives the binary output from the vertical counter, but an output is latched at line 50 only when the detection occurs by way of the signal on line 62 to the data latch.
  • the pair of counters shown in FIG. 6 have at any one period of time, corresponding binary signals associated therewith that correspond with X and Y locations on the CRT screen.
  • this scan signal causes the particular X and Y location signals to be latched in the respective data latches 44 and 46.
  • the output values of the counters are thus essentially frozen.
  • the software in the computer would use the X and Y locations in conjunction with other internal software logic to interpret the commands that are input by a user pointing to certain symbols or words on the CRT display. In this connection, refer again to the particular symbol 24A in FIG. 2 that has been pointed to by the selection pen 26.

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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

Système de saisie de données (10) à écran tactile utilisé avec un écran d'affichage (12) doté d'une surface d'affichage photo-active, comportant un faisceau de balayage régulable. Le système comprend au moins un photodétecteur (20) combiné au circuit de détection, permettant d'enregistrer en continu la position du faisceau dans la surface d'affichage. Un pointeur (26) est adapté pour réfléchir la lumière provenant du faisceau, vers le photodétecteur, afin de fournir un signal de verrouillage utilisé pour maintenir un signal identifiant l'emplacement sur l'écran d'affichage, correspondant à l'emplacement du moyen de pointeur.
PCT/US1987/002073 1986-01-03 1987-08-17 Systeme de saisie de donnees a ecran tactile Ceased WO1989001677A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP19870905859 EP0377558A4 (en) 1986-01-03 1987-08-17 Touch screen input system
PCT/US1987/002073 WO1989001677A1 (fr) 1986-01-03 1987-08-17 Systeme de saisie de donnees a ecran tactile

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US81606586A 1986-01-03 1986-01-03
PCT/US1987/002073 WO1989001677A1 (fr) 1986-01-03 1987-08-17 Systeme de saisie de donnees a ecran tactile

Publications (1)

Publication Number Publication Date
WO1989001677A1 true WO1989001677A1 (fr) 1989-02-23

Family

ID=26776140

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1987/002073 Ceased WO1989001677A1 (fr) 1986-01-03 1987-08-17 Systeme de saisie de donnees a ecran tactile

Country Status (2)

Country Link
EP (1) EP0377558A4 (fr)
WO (1) WO1989001677A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002007072A3 (fr) * 2000-07-19 2002-12-19 Next Holdings Ltd Systeme d'affichage a ecran tactile
WO2001091043A3 (fr) * 2000-05-24 2002-12-19 Next Holdings Ltd Systeme d'affichage a ecran tactile
WO2008093269A3 (fr) * 2007-01-29 2009-01-15 Koninkl Philips Electronics Nv Affichage interactif

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3443075A (en) * 1963-10-08 1969-05-06 Electronique & Automatisme Sa Man-machine communication system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1381588A (fr) * 1963-10-31 1964-12-14 Electronique & Automatisme Sa Perfectionnements aux systèmes de communication entre homme et machine
US4305071A (en) * 1980-04-16 1981-12-08 Bell Telephone Laboratories, Incorporated Touch sensitive screen signal detection arrangement

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3443075A (en) * 1963-10-08 1969-05-06 Electronique & Automatisme Sa Man-machine communication system

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001091043A3 (fr) * 2000-05-24 2002-12-19 Next Holdings Ltd Systeme d'affichage a ecran tactile
US6690363B2 (en) 2000-06-19 2004-02-10 Next Holdings Limited Touch panel display system
WO2002007072A3 (fr) * 2000-07-19 2002-12-19 Next Holdings Ltd Systeme d'affichage a ecran tactile
WO2008093269A3 (fr) * 2007-01-29 2009-01-15 Koninkl Philips Electronics Nv Affichage interactif
JP2010519605A (ja) * 2007-01-29 2010-06-03 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ 対話型ディスプレイ

Also Published As

Publication number Publication date
EP0377558A4 (en) 1991-11-13
EP0377558A1 (fr) 1990-07-18

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