[go: up one dir, main page]

WO1996032693A9 - Dispositif d'entree de determination de position et stylo electroluminescent - Google Patents

Dispositif d'entree de determination de position et stylo electroluminescent

Info

Publication number
WO1996032693A9
WO1996032693A9 PCT/IB1996/000326 IB9600326W WO9632693A9 WO 1996032693 A9 WO1996032693 A9 WO 1996032693A9 IB 9600326 W IB9600326 W IB 9600326W WO 9632693 A9 WO9632693 A9 WO 9632693A9
Authority
WO
WIPO (PCT)
Prior art keywords
light
dimension
input device
determining input
light emitting
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/IB1996/000326
Other languages
English (en)
Other versions
WO1996032693A1 (fr
Filing date
Publication date
Priority claimed from GB9507761A external-priority patent/GB2299856B/en
Application filed filed Critical
Priority to AU51182/96A priority Critical patent/AU5118296A/en
Publication of WO1996032693A1 publication Critical patent/WO1996032693A1/fr
Publication of WO1996032693A9 publication Critical patent/WO1996032693A9/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Definitions

  • This invention relates to position-determining input devices.
  • the invention is applicable to, but not limited to, use with digitizing technologies for pen-based computer systems. Separately and in addition it relates to a light emitting pen for such an input device.
  • the three technologies are resistive, electrostatic and electromagnetic.
  • the digitizing technology must work effectively with a hquid crystal display (LCD) screen, it must protect the LCD polarized surface, and it should accurately simulate the sense of pen and paper.
  • LCD hquid crystal display
  • Resistive digitizing technologies comprise a single or double layer of transparent conductive sheet applied over a protective glass surface and positioned above the top polarizing layer of the LCD screen.
  • the double- layered version relies on membrane touch-panel technology as known to those skilled in the art.
  • the pen causes the two sheets to make contact and the currents are measured to determine an 'x and 'y' co- ordinate for the pen.
  • a disadvantage of the resistive digitizer technology is that the two conductive sheets reduce the brightness of the screen significantly and are typically influenced by temperature and humidity in such a way as to adversely affect the uniform resistivity of the conductive sheets. As a result the positional measurements of the pen are less accurate.
  • a further problem associated with resistive digitizing technologies is that the measurements do not allow for proximity sensing of the pen. Hence, continuous depressions of the pen on the conductive sheets creates a limited life span for the sheets and further reduces the accuracy of the measurements over time.
  • Electrostatic (or capacitive) digitizers require a tethered pen.
  • a transparent conductive layer must also be deposited on the underside of the protective glass shield. In this way, as the pen nears the surface of the glass, the electronic signal in the pen creates a capacitive effect with the conductive sheet on the underside of the glass. Relative current measurements determine the 'x' and 'y' co-ordinate position of the pen.
  • electrostatic digitizers require tethered pens and that they reduce optical transmissions of the LCD screen by a similar level to the single-layer resistive technique.
  • Electromagnetic digitizers rely on a series of looped coils on a sensor board beneath the LCD screen. A magnetic field is created through the coils.
  • the pen may either reflect these electromagnetic waves back to the sensor board by its own coil inside of the pen, or the pen is tethered and sends back its own signal. Pen position is determined by measuring the magnetic signal from the pen relative to the position of the sensor board coils under the LCD screen.
  • a disadvantage of the electromagnetic digitizer is that it requires the "light-pipe" design for back-lighting, as known to those skilled in the art. This method of back-lighting requires that the light source is positioned at the side of the LCD screen, rather than behind the screen. Additionally the electromagnetic digitizer requires a magnetic shield to be placed between the sensor board and the system motherboard.
  • This invention seeks to provide an improved alternative arrangement for determining the position of digitizer input elements such as computer pens.
  • a position-determining input device comprising: a hght emitting cursor device and at least two hght sensing elements in a first linear array e.g. a CCD array or a photodiode array, extending in a first dimension, for providing signals responsive to light incident thereon.
  • a processing device is also provided, coupled to the at least two hght sensing elements, for calculating the position of the light emitting cursor device in the first dimension dependent on the signals from the at least two light sensing elements.
  • the processing determines the position of the light emitting cursor device.
  • the position-determining input device is hght, has low power consumption, is immune to noise and does not produce radio frequency interference (RFI) noise.
  • the position-determining input device further comprises a planar element having a first edge extending in the first dimension, wherein the at least two light sensing elements are disposed at the first edge of the planar element. In this manner the position of the light emitting cursor device on the planar element is determined in at least the first dimension.
  • the position-determining input device does not require a specific, active board with in-built sensors for determining positions.
  • the planar element is either a beam splitter or has light conducting and light reflecting properties and the first linear array comprises a multiplicity of light sensing elements, each providing a signal to the processing device.
  • hght passing through or on the surface of the planar element, perpendicular to the first dimension, is incident on the multiplicity of light sensing elements.
  • the processing device calculates the position of the hght emitting cursor device in the first dimension substantially dependent on the position in the first dimension of the individual light sensing element on which incident light is most intense.
  • the multiplicity of hght sensing elements provides a very high resolution of the position-determining input device.
  • the processing device includes an intensity/distance computation function for computing a position for the hght emitting cursor device in a second dimension, perpendicular to the first dimension, according to intensity of light incident on the first hnear array in the first dimension.
  • the position can be computed for the hght emitting cursor device in a third dimension, perpendicular to the first dimension and to the second dimension, according to intensity of light incident on the first and second linear arrays in the first and second dimensions.
  • the position-determining input device further comprises at least two light sensing elements in a second linear array extending in a second dimension, for providing signals responsive to hght incident thereon.
  • each linear array comprises a multiplicity of hght sensing elements, each providing a signal to the processing device, whereby the processing device calculates the position of the light emitting cursor device in the first and second dimensions substantially dependent on the positions in the first and second dimension of the respective individual light sensing elements in those arrays on which incident light is most intense.
  • the position-determining input device further comprises at least two light sensing elements in a third linear array extending in a third dimension, for providing signals responsive to light incident thereon. In this manner a three-dimensional position of the light emitting cursor device is determined.
  • a light pen comprising a power source, a light emitting element, a push-to- make switch connecting the light emitting element to the power source, and an elongate housing surrounding the power source and the light emitting element, with the light emitting element protruding from an end of the housing and with the light emitting element being mechanically coupled to the push-to-make switch, whereby pressure on the light emitting element closes the switch and causes the light emitting element to emit hght.
  • FIG. 1 shows a side view of a position-determining input device in accordance with a first embodiment of the invention.
  • FIG. 2 shows an upper view of device of FIG. 1.
  • FIG. 3 is a graph of hght intensity across one dimension of the position-determining input device of FIG. 1.
  • FIG. 4 shows a number of graphs of light intensity across one dimension of the position-determining input device of FIG. 1 with the different graphs related to the distance in a second dimension.
  • FIG. 5 shows a side view of an array of beam splitters in accordance with a second embodiment of the invention.
  • FIG. 6 shows an upper view of a two-dimensional plane using two light sensor arrays.
  • FIG. 7 is a three-dimensional graph showing how the light intensity measured in the two-dimensional plane of FIG. 6 is used to determine the position of a light emitting cursor device in a third dimension.
  • FIG. 8 is a three-dimensional view of a planar element comprising an array of beam splitters and two light sensor arrays in accordance with a third embodiment of the invention.
  • FIG. 9 is a three dimensional view of a planar element comprising a two-level array of beam splitters in accordance with a fourth embodiment of the invention.
  • FIG. 10 shows a three-dimensional view of a position-determining input device having three light sensor arrays positioned in the three- dimensions in accordance with an optional feature of the first four embodiments of the invention.
  • FIG. 11 is a cross section of a light pen in accordance with a further aspect of the invention.
  • the position-determining input device comprises a light emitting cursor device 10, a planar element 14, and an optical lens 15 operably coupled to a hght sensing element 12.
  • the light sensing element 12 is a hght sensor array, comprising at least two light sensing elements, and is disposed at a first edge of the planar element 14.
  • a processing device 16 e.g. a microprocessor, comprises an intensity/distance computation function 17 and a memory element 19 and is operably coupled to the light sensor array 12.
  • the hght emitting cursor device e.g. an active light pen, emits a beam of light on to the planar element 14.
  • the beam of hght is reflected off the planar element 14 and along the surface of the planar element 14, through the optical lens 15 and onto the light sensor array 12.
  • the light sensor array 12 may be a charge coupled device (CCD) array or a photodiode array.
  • the light sensor array 12 transmits signals to the processing device 16, responsive to light incident on the light sensing elements 11 and 13 of the light sensor array 12.
  • the intensity/distance computation function 17 of the processing device 16 calculates the position of the light emitting cursor device 10 in one dimension of the planar element 14 according to the transmitted signals from the light sensing elements.
  • An optional feature of this embodiment of the invention is for the light emitting cursor device 10 to emit a beam of light only when the light emitting cursor device 10 touches the planar element 14, thereby reducing the diffraction of light from the light emitting cursor device 10 and improving the accuracy of the position-determining calculation of the processing device 16.
  • FIG. 2 an upper view of a two-dimensional plane in accordance with the position-determining input device of FIG. 1 is shown.
  • the planar element 14 is shown in 'x' and 'y' dimensions with the position in the 'y' dimension being monitored by the light sensing elements 11 and 13 of the light sensor array.
  • the light sensor array 12 is operably coupled to the optical lens 15 and the processing device 16 and is disposed at a first edge of the planar element 14.
  • the processing device 16 comprises an intensity/distance computation function 17 and a memory element 19.
  • the position of the y' dimension of the light emitting cursor device 10, of FIG. 1 is calculated from the beam-hit point on the light sensor array 12.
  • the light sensor array 12 comprises a multiplicity of light sensing elements, each transmitting a signal to the processing device 16.
  • the intensity/distance computation function 17 of the processing device 16 calculates the position of the light emitting cursor device 10 in the first 'y' dimension substantially dependent on the position in the first y' dimension of the individual hght sensing element on which incident light is most intense.
  • the position of the 'x' dimension of the Hght emitting cursor device 10 of FIG. 1 is calculated using the graph of FIG. 3.
  • FIG. 3 a graph is shown of light intensity versus distance along a first dimension e.g. the y' dimension, of the planar element 14, in accordance with the position-determining input device of FIG. 1.
  • the light emitting cursor device 10, of FIG. 1 emits hght onto the light sensor array 12.
  • the processing device 16 produces a curve 18 of light intensity along the 'y' dimension of the planar element 14 from the signals transmitted from the light sensing elements of the light sensor array 12.
  • the 'y 0 ' position 20 of the emitted light from the light emitting cursor device 10 is calculated from the point of the maximum intensity of light (y 0 ) measured by the hght sensing elements.
  • FIG. 4 a number of graphs of light intensity across one-dimension of the planar element 14 are shown, in accordance with the position-determining input device of FIG. 1.
  • the level of intensity of the light emitting cursor device 10 of FIG. 1, measured by the light sensing elements, varies in the 'x' dimension between a minimum 'x' value and a maximum 'x' value.
  • the light sensor array 12 transmits a signal to the processing device 16, dependent upon the intensity of light incident to the light sensing elements, of FIG. 1 or FIG. 2.
  • a known 'y * position e.g.
  • the 'y 0 ' position 20 of the maximum intensity of light a calculation is performed to determine the 'x' position of the light on the planar element 14, from the light intensity versus distance graphs of FIG. 4.
  • the intensity of light corresponding to the y 0 position is measured as Io 22.
  • the 'x' position (x c ) 24 of the light emitting cursor device 10 is determined from the graphs of FIG. 4.
  • a preferred option for determining the 'x' position for the light intensity measured by the light sensing elements is, at the processing device 16, interpolating between the level of light intensity measured to the level of light intensity known for the maximum 'x' and minimum 'x' positions.
  • the curves associated with different positions of the light emitting cursor device 10 in the x' dimension are stored in, and retrieved from, a memory element 19 in the processing device 16. For the graphs of FIG. 4 to provide an accurate indication of the 'x' position of the light emitting cursor device 10, of FIG. 1, the light emitting cursor device 10 touches the planar element 14 when emitting the light beam.
  • the position-determining calculation occurs in the intensity/distance computation function 17 of the processing device 16.
  • the intensity/distance computation function 17 calculates the position of the light emitting cursor device 10 in the second 'x' dimension, perpendicular to the first 'y' dimension, according to intensity of light incident on the first linear array (light sensor array 12) in the first dimension.
  • only one light sensor array 12, positioned in one dimension, is used to determine the two-dimensional position of the light source.
  • the hght sensor array 12 comprises a multiplicity of light sensing elements, e.g. 20 to 1000 in number.
  • the graph of FIG. 4 provides an indication of the position in a third, 'z', dimension of the light emitting cursor device 10 of FIG. 1.
  • the shape of the curves of FIG. 4 are consequently more constant (less light-intensity varying) for the case where the light emitting cursor device 10 is positioned above the planar element 14. In this situation the light is dispersed more evenly between the light sensing elements 11 and 13, of the light sensor array 12, as compared to the situation where the light emitting cursor device 10 touches the planar element 14.
  • FIG. 5 a side view of a beam splitter planar element 26 is shown in accordance with a preferred embodiment of the invention.
  • the beam splitter planar element 26 in FIG. 5 replaces the planar element 14 of FIG. 1.
  • the beam splitter planar element 26 comprises a number of parallel mirrors (beam splitters) positioned at 45 degrees to the surface of the beam splitter planar element 26.
  • the light emitting cursor device 10 emits a light beam into the beam splitter planar element 26.
  • the emitted light is reflected off one of the mirrors of the beam splitter array, and through, the array of beam splitters to the optical lens 15 and the light sensor array 12.
  • the light sensor array 12 comprises a multiplicity of hght sensing elements.
  • Each light sensing element of the light sensor array 12 transmits signals to the processing device 16.
  • the intensity/distance computation function 17 in the processing device 16 determines a position of the light emitting cursor device 10, in a first dimension by calculating which hght sensing element received the highest intensity of light from the light emitting cursor device 10.
  • the intensity/distance computation function 17 in the processing device 16 also calculates the position of the hght emitting cursor device 10 in a second dimension by measuring the intensity of light that has been reflected through the beam splitter planar element 26.
  • the intensity of light is attenuated by each mirror in the beam splitter planar element 26.
  • the resolution of the measurement of the 'x' position is determined by the finite width between the mirrors of the beam sphtter planar element 26.
  • the position-determining input device comprises a planar element 14 and two light sensor arrays 12 and 28.
  • the light sensor arrays 12 and 28 preferably comprise a multiplicity of light sensing elements and are disposed at first and second edges of the planar element 14. By way of a simplified explanation they are shown in FIG, 6 as comprising two light sensing elements 11 and 13, and 31 and 33 respectively.
  • the two light sensor arrays 12 and 28 are respectively coupled to optical lenses 15 and 32 through band-pass optical filters 34 and 36 which are arranged to select only the desired light source.
  • the light sensor arrays 12 and 28 are operably coupled to a processing device 16, for processing signals from the light sensor arrays 12 and 28.
  • the processing device 16 comprises an intensity/distance computation function 17 and a memory element 19.
  • the light sensor arrays 12 and 28 are positioned for operation in two-dimensions of the planar element 14 and are extensions of the light sensor array (light sensing element) 12 described for primary operation in one dimension of FIG. 1, FIG. 2 or FIG. 5.
  • the light sensor arrays 12 and 28 are positioned in a first and second dimension of the planar element 14 and indicate the 'x' and y' positions of the light emitting cursor device 10.
  • Each light sensing element 11, 13, 31 and 33 within the hght sensor arrays 12 and 28 provides signals responsive to hght incident thereon.
  • Signals from each light sensing element in the hght sensor arrays 12 and 28 are transmitted to the processing device 16.
  • the intensity/distance computation function 17 of the processing device 16 determines which hght sensing elements receive the highest intensity of incident light incident and thereby the two-dimensional position of the hght emitting cursor device 10.
  • the hght sensor arrays 12 and 28 comprise a multiplicity of light sensing elements.
  • the position-determining operation in two dimensions is used for calculating the position of the light emitting cursor device 10 in a third, 'z , dimension.
  • the third 'z' dimension is perpendicular to the first 'x' dimension and to the second 'y' dimension.
  • the intensity/distance computation function 17 of the processing device 16 calculates the position of the hght emitting cursor device 10 according to the intensity of light incident on the first and second hght sensor arrays 28 and 30 as shown in FIG. 7.
  • the hght sensor arrays 12 and 28 may be a CCD array or a photodiode array.
  • the planar element 14 may be an array of beam splitters or have light conducting and light reflecting properties. Referring now to FIG. 7, a three-dimensional graph is shown. The xo' and yo" positions of the graph are determined substantially as described with reference to the position-determining input device of FIG. 6. However, the intensity of light from the light emitting cursor device 10, as shown in FIG. 7, is measured by the two light sensor arrays 12 and 28 of FIG. 6.
  • the light intensity measured by the intensity/distance computation function 17 in the two-dimensional plane of FIG. 6 is used to determine the position of the light emitting cursor device 10 in the third, z' dimension.
  • a further optional feature for determining the position of the light emitting cursor device 10 in a third 'z' dimension is to use the first light sensor array 12 substantially as described with reference to FIG. 2, FIG. 3 and FIG. 4, to determine the 'x' and y' positions of the hght emitting cursor device 10.
  • the second light sensor array 28 is then arranged in the third dimension to determine the 'z position of the light emitting cursor device 10.
  • the position-determining input device comprises a beam splitter planar element 26 and two hght sensor arrays 12 and 28, each having at least two light sensing elements disposed at a first and second edge of the beam splitter planar element 26.
  • the two light sensor arrays 12 and 28 are respectively operably coupled to optical lenses 15 and 32 through band ⁇ pass optical filters 34 and 36, arranged to select only the desired light source.
  • the light sensor arrays 12 and 28 are operably coupled to a processing device 16, for processing the signals from the light sensor arrays 12 and 28.
  • the processing device 16 comprises an intensity/distance computation function 17 and a memory element 19.
  • the light sensor arrays 28 and 30 provide an indication of the 'x' and 'y' position of the light emitting cursor device 10.
  • the light sensor array 12 receives light emitted along the top surface of the beam splitter planar element 26 to indicate the 'x' position of the light emitting cursor device 10.
  • the light sensor array 28 receives light reflected by the beam splitter mirrors and transmitted through the beam splitter planar element 26 to indicate the y' position of the light emitting cursor device 10.
  • An alternative arrangement using a two-level beam splitter planar element is shown in FIG. 9. In operation, light is emitted from the light emitting cursor device 10 into the two level beam splitter planar element.
  • a first portion of light is reflected off beam splitter mirrors in a first array of beam splitters contained within a first beam splitter planar element 38, and transmitted through the beam splitter planar element 38, to indicate the 'x' position of the light emitting cursor device 10.
  • a second portion of the light is emitted through the first beam splitter planar element 38 into a second beam splitter planar element 26, where the beam splitter mirrors are arranged orthogonally to the beam splitter mirrors of the first beam splitter planar element 38.
  • the light is reflected off the beam splitter mirrors in the second beam splitter planar element 26, and transmitted through the beam splitter planar element 26, to indicate of the 'y' position of the light emitting cursor device 10.
  • the preferred embodiment of the invention comprises two light sensing elements, but an optional feature would be to include a third light sensing element to measure the position of the light emitting cursor device 10 in a third dimension, as shown in FIG. 10.
  • FIG. 10 a three-dimensional view of a planar element 14 with three light sensor arrays 12, 28 and 30 is shown in accordance with an optional feature of the preferred embodiment of the invention.
  • Two of the three hght sensor arrays, 12 and 28, are disposed at a first and second edge of the planar element 14.
  • the three light sensor arrays 12, 28 and 30 are operably coupled to optical lenses 15, 32 and 42 and band-pass optical filters 34, 36 and 40 which are arranged to select only the desired hght source.
  • the light sensor arrays 12, 28 and 30 are also operably coupled to a processing device 16, for processing the signals from light sensing elements in the light sensor arrays 12, 28 and 30.
  • the processing device 16 comprises an intensity/distance computation function 17 and a memory element 19.
  • the position of the light emitting cursor device 10 in a third dimension is determined, by the intensity/distance computation function 17 of the processing device 16, from signals responsive to light incident on the light sensing elements in the light sensor arrays 12, 28 and 30.
  • the light sensor arrays 12, 28 and 30 are any combination of linear light sensor arrays such as CCD arrays or photodiode arrays and are positioned in the 'x', y' and 'z' dimensions of the planar element 14.
  • the planar element 14 may be a beam splitter planar element or have light reflecting and light conducting properties.
  • the position-determining input device according to the preferred embodiment of the invention requires lower power consumption than present position-determining input devices.
  • the position-determining input device is lighter, immune to noise, does not produce RFI and is accurate.
  • the resolution of. the position-determining calculations is dictated by the number of light sensing elements and the planar element used and not to the variable performance associated with a resistive touch sensor pad.
  • the planar element is not active (i.e. does not require a current source to operate) and no cahbration is required.
  • a number of preferred embodiments have been provided that allow proximity sensing of the pen and a "tethered" pen is not needed.
  • a light pen which is suitable for use in the two-dimensional input devices described above.
  • the pen comprises a battery power source 100, a light emitting element 101, a push-to-make switch having contacts 102 and 103 and a mechanical spring 104.
  • the light emitting element 101 is connected to the battery 100 via the contacts 103, 104 when the contacts are closed.
  • the contacts are closed by pressing the pen on a surface such as planar element 14, causing spring 104 to compress and close the contacts 102, 103.
  • the arrangement has the advantage of power saving, because a convienient switch arrangement is provided causing power to be drawn only when there is downward pressure on the pen. Additionally, spurious inputs are avoided which might otherwise arise if a constant light source were used causing inputs to the input device when the pen is not in contact with the planar surface.
  • the combination of the light pen and a two-dimensional input device as described and claimed is a very advantageous combination.

Abstract

Le dispositif d'entrée de détermination de position de l'invention possède un curseur électroluminescent (10) et au moins deux éléments (11 et 13) de détection de lumière placés dans une première matrice linéaire (12) s'étendant dans une première direction, et permet de générer des signaux sensibles à une lumière incidente. Ce dispositif d'entrée de détermination de position comprend également un dispositif de traitement (16) couplé à au moins deux éléments (11 et 13) de détection de lumière servant à calculer la position du curseur électroluminescent (10) se trouvant dans la première direction en fonction des signaux provenant au moins des deux éléments (11 et 13) de détection de lumière. Un stylo lumineux est également décrit.
PCT/IB1996/000326 1995-04-13 1996-04-12 Dispositif d'entree de determination de position et stylo electroluminescent Ceased WO1996032693A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU51182/96A AU5118296A (en) 1995-04-13 1996-04-12 Position-determining input device and light emitting pen

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9507761.6 1995-04-13
GB9507761A GB2299856B (en) 1995-04-13 1995-04-13 Position-determining input device

Publications (2)

Publication Number Publication Date
WO1996032693A1 WO1996032693A1 (fr) 1996-10-17
WO1996032693A9 true WO1996032693A9 (fr) 1997-08-21

Family

ID=10773075

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB1996/000326 Ceased WO1996032693A1 (fr) 1995-04-13 1996-04-12 Dispositif d'entree de determination de position et stylo electroluminescent

Country Status (3)

Country Link
AU (1) AU5118296A (fr)
GB (1) GB2299856B (fr)
WO (1) WO1996032693A1 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7952570B2 (en) 2002-06-08 2011-05-31 Power2B, Inc. Computer navigation
US20220261097A1 (en) * 2003-06-09 2022-08-18 Power2B, Inc. Input system for controlling electronic device
US7298367B2 (en) 2003-11-25 2007-11-20 3M Innovative Properties Company Light emitting stylus and user input device using same
GB2424269A (en) 2004-04-01 2006-09-20 Robert Michael Lipman Control apparatus
US8610675B2 (en) 2007-03-14 2013-12-17 Power2B, Inc. Interactive devices
US10452207B2 (en) 2005-05-18 2019-10-22 Power2B, Inc. Displays and information input devices
US9569093B2 (en) 2005-05-18 2017-02-14 Power2B, Inc. Displays and information input devices
US9317170B2 (en) 2005-05-18 2016-04-19 Power2B, Inc. Interactive devices
US8624850B2 (en) 2007-03-14 2014-01-07 Power2B Displays and information input devices
KR20140129173A (ko) 2005-09-08 2014-11-06 파워2비, 인크. 디스플레이들 및 정보입력장치들
US9298284B2 (en) * 2014-03-11 2016-03-29 Qualcomm Incorporated System and method for optically-based active stylus input recognition
CN112860083B (zh) * 2021-01-08 2023-01-24 深圳市华星光电半导体显示技术有限公司 激光笔光源定位方法及显示装置

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1371606A (en) * 1971-11-11 1974-10-23 Secr Defence Light projecting devices
DE2862178D1 (en) * 1977-12-26 1983-03-17 Nippon Telegraph & Telephone Coordinate input apparatus
US4320292A (en) * 1979-08-22 1982-03-16 Nippon Telegraph And Telephone Public Corporation Coordinate input apparatus
IT1210039B (it) * 1982-12-29 1989-09-06 Savio Spa Trasportatore a passo di tubetti er macchine tessili.
GB8332429D0 (en) * 1983-12-06 1984-01-11 Scally R F Photoelectric apparatus
US4949079A (en) * 1985-04-19 1990-08-14 Hugh Loebner Brightpen/pad graphic device for computer inputs and the like
US4688933A (en) * 1985-05-10 1987-08-25 The Laitram Corporation Electro-optical position determining system
US4677428A (en) * 1985-06-07 1987-06-30 Hei, Inc. Cordless light pen
FR2592459B1 (fr) * 1986-01-02 1989-03-10 Rousseau Jean Pierre Lampe electrique, notamment lampe de poche
US4911527A (en) * 1988-12-20 1990-03-27 Texas Instruments Incorporated Fiber optics input device
US5410334A (en) * 1990-09-19 1995-04-25 International Business Machines Corporation Switch for pen-down sensing in electronic styli
US5164585A (en) * 1991-09-24 1992-11-17 Daniel Y. T. Chen Stylus/digitizer combination with elongate reflectors and linear CCD
CA2060564C (fr) * 1992-02-06 1996-05-21 Toru Suzuki Dispositif de saisie sans fil pour ordinateur
US5317140A (en) * 1992-11-24 1994-05-31 Dunthorn David I Diffusion-assisted position location particularly for visual pen detection
US5502568A (en) * 1993-03-23 1996-03-26 Wacom Co., Ltd. Optical position detecting unit, optical coordinate input unit and optical position detecting method employing a pattern having a sequence of 1's and 0's

Similar Documents

Publication Publication Date Title
US11054935B2 (en) Stylus with contact sensor
US6927384B2 (en) Method and device for detecting touch pad unit
US10901556B2 (en) Instrument detection with an optical touch sensitive device
US9035909B2 (en) Touch surface with variable refractive index
US9965101B2 (en) Instrument detection with an optical touch sensitive device
US9557846B2 (en) Pressure-sensing touch system utilizing optical and capacitive systems
US7265748B2 (en) Method and device for detecting touch pad input
KR102213486B1 (ko) 고속 멀티 터치 노이즈 감소
WO1996032693A9 (fr) Dispositif d'entree de determination de position et stylo electroluminescent
US20200387237A1 (en) Instrument with Passive Tip
US20030048257A1 (en) Telephone set having a touch pad device
WO1996032693A1 (fr) Dispositif d'entree de determination de position et stylo electroluminescent
US20100295821A1 (en) Optical touch panel
US20120306802A1 (en) Differential capacitance touch sensor
KR20160145120A (ko) 유손실 분산형 ftir 층을 갖는 광학 터치 스크린
CN106940598A (zh) 集触控和指纹识别的光学触摸屏
WO2002057089A1 (fr) Dispositif d'entree electronique
EP3436905B1 (fr) Affichage de détection de pression
US20030146906A1 (en) Tracking and pressure-sensitive digital pen
WO2007123841A2 (fr) Procédé et système permettant de déterminer la position du bord latéral d'une bande
WO2021051748A1 (fr) Écran tactile à réseau de diffraction basé sur une distribution de structure réticulaire
KR101666490B1 (ko) 격자형 전도성 감지부를 구비한 터치스크린 장치
KR101497419B1 (ko) 이차원 전도성 감지망을 구비한 터치스크린 장치
WO2019059061A1 (fr) Dispositif panneau tactile
JP2005242452A (ja) 座標入力装置