WO2015072630A1 - Touch screen using mems mirror - Google Patents

Touch screen using mems mirror Download PDF

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Publication number
WO2015072630A1
WO2015072630A1 PCT/KR2014/002432 KR2014002432W WO2015072630A1 WO 2015072630 A1 WO2015072630 A1 WO 2015072630A1 KR 2014002432 W KR2014002432 W KR 2014002432W WO 2015072630 A1 WO2015072630 A1 WO 2015072630A1
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WO
WIPO (PCT)
Prior art keywords
unit
display unit
touch screen
light source
touch
Prior art date
Application number
PCT/KR2014/002432
Other languages
English (en)
French (fr)
Inventor
Yong Han Lee
Original Assignee
Lg Electronics Inc.
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 Lg Electronics Inc. filed Critical Lg Electronics Inc.
Publication of WO2015072630A1 publication Critical patent/WO2015072630A1/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
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • G06F3/0421—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen
    • G06F3/0423—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen using sweeping light beams, e.g. using rotating or vibrating mirror
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means

Definitions

  • the teachings in accordance with exemplary embodiments of this invention relate generally to a touch screen using a MEMS (Micro Electro Mechanical System) mirror.
  • MEMS Micro Electro Mechanical System
  • the touch screens unlike the conventional screens that simply provide information, can input information by touching using a user hand or peripheral devices, and can be variably used as a crystal liquid screen of a mobile phone, an information screen at a public place and a black board.
  • the Korean Patent Application No.: 10-2004-7005084 (Titled as “Device having touch sensitivity functionality”) discloses a touch screen having a rotary reflector at a corner of the screen.
  • the touch screen however disadvantageously increases sizes of the touch screen and an electronic device using the touch screen because a size of a driving unit for rotating the rotary reflector is too large.
  • the driving unit for rotating the rotary reflector disadvantageously generate a large noise that is generated by mechanical elements such as a coil and a spring, and when an angle of the rotary reflector for emitting laser beam to the touch screen is distorted, the laser beam and the screen are not in parallel to make it difficult to accomplish an accurate touch control. That is, alignment is difficult for parallel irradiating the laser beam to the touch screen when an angle of the reflector at one side is changed.
  • the Korean Patent Application No.: 10-2010-0042783 (Titled as “Device having touch sensitivity functionality”) discloses sensor units at three sides with a reflector using a MEMS mirror at two adjacent corners for embodying a fast and accurate touch screen.
  • this structure is disadvantageous in that it has a complicate in structure because it needs various constituent elements due to not being operated by a distance measuring method, and that the structural complication leads to increase in manufacturing cost and degradation in durability.
  • an object of the present invention is to provide a structure-simplified and miniaturized touch screen using a MEMS mirror configured to maintain an accurate horizontality on a display at all times.
  • An object of the invention is to solve at least one or more of the above problems and/or disadvantages in whole or in part and to provide at least the advantages described hereinafter.
  • a touch screen using a MEMS (Micro Electro Mechanical System)mirror comprising:
  • a MEMS mirror formed at a corner of one side of a surface of the display unit, and including a leveling unit having a first rotary axis parallel with a surface of the display unit, a light irradiation unit formed inside the leveling unit and having a second rotary axis orthogonal to the first rotary axis of the leveling unit;
  • a light source unit configured to emit a laser beam to the light irradiation unit
  • a driving unit configured to drive the leveling unit of the MEMS mirror and the light irradiation unit
  • a detection unit configured to receive the emitted laser beam and to detect a touch position on the display unit.
  • the MEMS mirror may be formed at an upper surface of a display unit to allow the second rotary axis of the light irradiation unit to be positioned perpendicular to the display unit surface.
  • the light source unit may be formed at an upper surface of the display unit.
  • the MEMS mirror may be formed at an upper surface of the display unit to allow the second rotary axis of the light irradiation unit to be angled at 60° ⁇ 90°relative to the surface of the display unit.
  • the light source unit may be formed at a bottom surface of the display unit.
  • the touch screen may further comprise a controller electrically connected to the light source unit, the driving unit and the detection unit, wherein the controller generates a control signal configured to move the leveling unit by controlling the driving unit to allow the laser beam to be parallel irradiated to the display unit when the laser beam is not parallel irradiated to the display unit by calculating whether the laser beam detected by the detection unit is parallel irradiated to the display unit, calculating a touch coordinate using a distance to a touch point on the display unit and a rotary angle of the light irradiation unit, and filtering the touch coordinate based on the calculated touch coordinate or generating a touch time.
  • the controller generates a control signal configured to move the leveling unit by controlling the driving unit to allow the laser beam to be parallel irradiated to the display unit when the laser beam is not parallel irradiated to the display unit by calculating whether the laser beam detected by the detection unit is parallel irradiated to the display unit, calculating a touch coordinate using a distance to a touch
  • the light source unit may include a laser diode or a photo diode.
  • the touch screen may further comprise a lens unit interposed between the light source unit and the MEMS mirror configured to collect a light source emitted from the light source unit.
  • the touch screen using an MEMS mirror according to the present invention has an advantageous effect in that durability can be improved by minimized generation of internal heat by using a MEMS mirror having two axes, a driving angle can be expanded by reducing a driving resistance of the mirror, and a miniaturized accurate touch screen can be realized by irradiating a light source configured to level a display unit and a horizontal angle at all times.
  • FIG. 1 is a front view illustrating a touch screen according to an exemplary embodiment of the present invention
  • FIG.2 is a schematic diagram illustrating a configuration of a touch screen according to the present invention.
  • FIGS.3a and 3b are rear views of a touch screen according to an exemplary embodiment of the present invention.
  • FIG. 4 is a perspective view illustrating an MEMS mirror according to an exemplary embodiment of the present invention.
  • FIG.5 is a rear view illustrating a touch screen according to an exemplary embodiment of the present invention.
  • FIG.6 is a rear view illustrating a touch screen according to another exemplary embodiment of the present invention.
  • FIG.7 is a rear view illustrating a touch screen according to still another exemplary embodiment of the present invention.
  • FIG.8 is a control flowchart of a controller according to an exemplary embodiment of the present invention.
  • FIG. 1 is a front view illustrating a touch screen according to an exemplary embodiment of the present invention
  • FIG.2 is a schematic diagram illustrating a configuration of a touch screen according to the present invention.
  • a touch screen (100) includes a display unit (110), an MEMS mirror (120), a driving unit (130) configured to driving the MEMS mirror, a detection unit (160) and a light source unit (140).
  • the display unit (110) may be a conventional display unit and may include a CRT (Cathode Ray Tube), an LCD (Liquid Crystal Display), an LED (Light Emitting Diode), a PDP (Plasma Display Panel) or an OLED (Organic-LED).
  • CTR Cathode Ray Tube
  • LCD Liquid Crystal Display
  • LED Light Emitting Diode
  • PDP Plasma Display Panel
  • OLED Organic-LED
  • the light source unit (140) may include a laser diode or a photo diode, and emits a laser beam to the MEMS mirror (120, described later).
  • the laser beam conventionally emits an infrared laser.
  • the MEMS (Micro Electro Mechanical System) mirror (120) is formed at a corner of one side of a surface of the display unit (110) to periodically irradiate light emitted from the light source (140) to a front surface of the display unit (110).
  • the MEMS mirror (120) has a see-saw vibrating structure by being oscillated by an external force.
  • the conventional polygonal mirror suffers from disadvantages of being limited in scanning speed and miniaturization and of generating a noise.
  • the MEMS mirror (120) can perform bidirectional and high speed scanning, and can be manufactured in a small size by a semiconductor manufacturing process, whereby price competitiveness is available due to easy mass production. Materials and shapes of the MEMS mirror (120) according to the exemplary embodiment of the present invention will be described later.
  • the driving unit (130) drives the MEMS mirror (120) by controlling amplitude.
  • the driving unit (130) may be embodied by a conventional actuator using an electromagnetic field or a magnetic field, or may be embodied by an actuator using an ultrasonic wave that generates no noise.
  • the detection unit (160) receives laser beam re-reflected by being irradiated in parallel to a surface of the display unit (110) by the MEMS mirror (120) to detect a touch position on the display unit (110).
  • the detection unit (160) will be omitted in detailed explanation because the detection unit (160) may use a conventionally used detection method.
  • the present invention may further include a lens unit (150) between the light source unit (140) and the MEMS mirror (120) that collect light sources emitted from the light source unit (140).
  • FIGS.3a and 3b are rear views of a touch screen (100) according to an exemplary embodiment of the present invention.
  • the laser beam irradiated through the MEMS mirror (120) must be irradiated in parallel on the surface of the display unit (110) to generate an accurate touch coordinate.
  • the laser beam irradiated through the MEMS mirror (120) must be irradiated in parallel on the surface of the display unit (110) to generate an accurate touch coordinate.
  • the present invention provides a MEMS mirror (120) capable of performing an automatic alignment to enable the laser beam to be horizontally irradiated on the display unit (110).
  • FIG. 4 is a perspective view illustrating an MEMS mirror (120) according to an exemplary embodiment of the present invention.
  • the MEMS mirror (120) may include a leveling unit (121) having a first rotary axis (120a) parallel with a surface of the display unit (110) and a light irradiation unit (122) formed inside the leveling unit (121) and having a second rotary axis (120b) orthogonal to the first rotary axis (120a) of the leveling unit (121).
  • Two surfaces or one surface of the MEMS mirror (120) may be formed with a metal thin film using a plating process or an evaporation process, or may be formed by attaching a separate reflective film.
  • only the light irradiation unit (122) may be formed with a metal thin film, or may be formed by attaching a separate reflective film.
  • the MEMS mirror (120) can always maintain in parallel the laser beam irradiated to a surface of the display unit (110), and can periodically irradiate the laser beam on an entire surface of the display unit (110) using the light irradiation unit (122).
  • the touch screen (100) may be implemented by using the following exemplary embodiments.
  • FIG.5 is a rear view illustrating a touch screen according to an exemplary embodiment of the present invention
  • FIG.6 is a rear view illustrating a touch screen according to another exemplary embodiment of the present invention.
  • the MEMS mirror (120) may be formed at an upper surface of a display unit to allow the second rotary axis (120b) of the light irradiation unit (122) to be positioned perpendicular to the surface of the display unit. That is, the MEMS mirror (120) may be arranged at 90°relative to the surface or the display unit (110), and the light source unit (140) and the lens unit (150) may be also arranged perpendicular to the upper surface of the display unit (110).
  • the MEMS mirror (120) may be formed at an upper surface of a display unit to allow the second rotary axis (120b) of the light irradiation unit (122) to be positioned at 90°or more angle relative to the surface or the display unit (110). That is, the MEMS mirror (120) may be positioned at 120°relative to the surface of the display unit (110), and the light source unit (140) and the lens unit (150) may be arranged at approximately 30°relative to the upper surface of the display unit (110).
  • the MEMS mirror (120) when the MEMS mirror (120) is positioned at 90°or more angle relative to the surface or the display unit (110), as in FIGS. 5 and 6, the MEMS mirror (120) can be attachably and detachably realized on the display unit (110) by manufacturing elements of the present invention other than the display unit (110) in a modular manner.
  • FIG.7 is a rear view illustrating a touch screen (100) according to still another exemplary embodiment of the present invention.
  • the MEMS mirror (120) may be formed at an upper surface of a display unit (110) to allow the rotary axis of the light irradiation unit (122) to be positioned at less than 90°relative to the surface or the display unit (110).
  • the MEMS mirror (120) may be arranged at 60°relative to the surface or the display unit (110), and the light source unit (140) and the lens unit (150) may be arranged at approximately 30°relative to the bottom side of the display unit (110).
  • the MEMS mirror (120) when the MEMS mirror (120) is positioned at less than 90°relative to the surface or the display unit (110), as in FIG. 7, the MEMS mirror (120) can be mounted inside the touch screen (100) by manufacturing elements other than the display unit (110) in an embedded manner.
  • the touch screen (100) using the MEMS mirror (120) may be driven by the following methods.
  • FIG.8 is a control flowchart of a controller (170) according to an exemplary embodiment of the present invention.
  • the touch screen (100) may further comprise a controller (170) electrically connected to the light source unit (140). a driving unit (130) and the detection unit (160),
  • the controller (170) generates a control signal configured to move the leveling unit (121) by controlling the driving unit (130) to allow the laser beam to be parallel irradiated to the display unit (110) when the laser beam is not parallel irradiated to the display unit (110) by calculating whether the laser beam detected by the detection unit (160) is parallel irradiated to the display unit, whereby the leveling unit (121) is moved based on the first rotary axis (120a) to irradiate the laser beam in parallel to the display unit (110).
  • the controller (170) calculates a touch coordinate using a distance to a touch point on the display unit (110) and a rotary angle of the light irradiation unit (122), and filters the touch coordinate based on the calculated touch coordinate or generates a touch time, whereby a more accurate touch screen (100) can be realized.
  • the controller (170) can apply a control signal configured to rotate the leveling unit (121) based on the first rotary axis (120a) to the driving unit (130), and apply a control signal configured to rotate the light irradiation unit (122) based on the second rotary axis (120b), whereby the control signal can control the amplitude of the driving unit (130) based on the generated touch coordinate.
  • the calculated touch coordinate can be more accurately corrected through feedback of the generated filtering and touch time.
  • the present invention can always irradiate the laser beam parallel to the display unit (110) using the MEMS mirror (120) having two orthogonal axes whereby accurate touch coordinate can be realized using simple elements.
  • the controller (170) may so control the light irradiation unit (122) of the MEMS mirror (120) as to allow having an irradiation angle of ⁇ 10°when an initially driving angle is zero ⁇ when the laser beam irradiated to the display unit (110) irradiates to a center of the display unit (110), i.e., when an angle from the light irradiation unit (122) to the surface of the display unit (110) is zero ⁇ .

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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)
  • Mechanical Optical Scanning Systems (AREA)
PCT/KR2014/002432 2013-11-15 2014-03-24 Touch screen using mems mirror WO2015072630A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020130139299A KR20150056364A (ko) 2013-11-15 2013-11-15 멤스 미러를 이용한 터치 스크린
KR10-2013-0139299 2013-11-15

Publications (1)

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WO2015072630A1 true WO2015072630A1 (en) 2015-05-21

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PCT/KR2014/002432 WO2015072630A1 (en) 2013-11-15 2014-03-24 Touch screen using mems mirror

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WO (1) WO2015072630A1 (ko)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6985376B2 (ja) * 2016-09-21 2021-12-22 コーニンクレッカ フィリップス エヌ ヴェKoninklijke Philips N.V. 静電容量タッチスクリーンミラーデバイス及び製造方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7476846B2 (en) * 2006-03-15 2009-01-13 Omron Corporation Radar device and MEMS mirror device therefor
US7872394B1 (en) * 2001-12-13 2011-01-18 Joseph E Ford MEMS device with two axes comb drive actuators
US7969637B1 (en) * 2008-06-30 2011-06-28 Advanced Numicro Systems, Inc. MEMS mirror driven by one motion with oscillations of different frequency for bidirectional rotation
US8405639B1 (en) * 2009-09-03 2013-03-26 Advanced Numicro Systems, Inc. Scanning mirror touch screen with minimum bezel height
US20130162597A1 (en) * 2011-12-23 2013-06-27 Azurewave Technologies, Inc. Optical touch control module

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7872394B1 (en) * 2001-12-13 2011-01-18 Joseph E Ford MEMS device with two axes comb drive actuators
US7476846B2 (en) * 2006-03-15 2009-01-13 Omron Corporation Radar device and MEMS mirror device therefor
US7969637B1 (en) * 2008-06-30 2011-06-28 Advanced Numicro Systems, Inc. MEMS mirror driven by one motion with oscillations of different frequency for bidirectional rotation
US8405639B1 (en) * 2009-09-03 2013-03-26 Advanced Numicro Systems, Inc. Scanning mirror touch screen with minimum bezel height
US20130162597A1 (en) * 2011-12-23 2013-06-27 Azurewave Technologies, Inc. Optical touch control module

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