KR101293833B1 - Touch screen apparatus and method for operating touch screen apparatus - Google Patents

Touch screen apparatus and method for operating touch screen apparatus Download PDF

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Publication number
KR101293833B1
KR101293833B1 KR1020110117369A KR20110117369A KR101293833B1 KR 101293833 B1 KR101293833 B1 KR 101293833B1 KR 1020110117369 A KR1020110117369 A KR 1020110117369A KR 20110117369 A KR20110117369 A KR 20110117369A KR 101293833 B1 KR101293833 B1 KR 101293833B1
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South Korea
Prior art keywords
driving signal
sensing
touch screen
infrared
screen device
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KR1020110117369A
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Korean (ko)
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KR20130052116A (en
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류홍근
우성호
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재단법인대구경북과학기술원
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Priority to KR1020110117369A priority Critical patent/KR101293833B1/en
Priority to PCT/KR2012/009445 priority patent/WO2013070012A1/en
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    • 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
    • G06F3/0425—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means using a single imaging device like a video camera for tracking the absolute position of a single or a plurality of objects with respect to an imaged reference surface, e.g. video camera imaging a display or a projection screen, a table or a wall surface, on which a computer generated image is displayed or projected
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04109—FTIR in optical digitiser, i.e. touch detection by frustrating the total internal reflection within an optical waveguide due to changes of optical properties or deformation at the touch location

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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)
  • Multimedia (AREA)
  • Position Input By Displaying (AREA)

Abstract

A touch screen device and a method of operating the touch screen device are disclosed. The touch screen device may include a screen unit that scatters infrared rays generated by an infrared ray generating unit, a sensor unit which senses at least one of the scattered infrared rays or an external light source, and a power source of the infrared ray generating unit and the sensor unit in conjunction with a touch. And a driving unit generating a driving signal related to sensing and driving the infrared ray generating unit and the sensor unit according to the driving signal.

Description

TOUCH SCREEN APPARATUS AND METHOD FOR OPERATING TOUCH SCREEN APPARATUS}

Embodiments of the present invention relate to a touch screen device and a method of operating the touch screen device capable of increasing the accuracy of touch recognition for the screen unit.

The conventional touch screen detects the occurrence of user input by recognizing that the characteristics of the area change when an object (e.g., a finger) touches a predetermined area by attaching a touch panel to the screen of the monitor.

The touch screen uses an infrared LED and a general camera sensor or a series camera sensor rather than a film such as a capacitive film or a resistive film, thereby minimizing cost while implementing a large touch display.

However, a touch screen using a serial camera sensor is difficult to recognize a plurality of multi-touches (eg, three or more multi-touches).

In addition, the touch screen using a general camera sensor can recognize a plurality of multi-touch, but by the external light source having a wavelength similar to sunlight or infrared LED, accurate touch recognition is not easy.

An embodiment of the present invention by controlling the power of the infrared generating unit for generating infrared rays to the screen unit, by comparing the first image obtained when the power on and the second image obtained when the power off, by recognizing the touch on the screen unit The purpose of the present invention is to increase the accuracy of touch recognition.

According to an embodiment of the present invention, a touch screen device may include a screen unit that scatters infrared rays generated by an infrared ray generator, a sensor unit that senses at least one of the scattered infrared rays or an external light source, in association with a touch, and the infrared ray generator. And a driving unit generating a driving signal related to power and sensing in the sensor unit and driving the infrared ray generating unit and the sensor unit according to the driving signal.

The driving unit receives a second driving signal related to sensing of a sensor unit, and generates a first driving signal related to a power source of an infrared ray generating unit based on the input second driving signal, or receives the first driving signal. The second driving signal may be generated based on the input first driving signal.

The driving unit may generate the first and second driving signals such that a period of the first driving signal associated with the power source is n times (n is a real number of two or more) times the second driving signal associated with the sensing.

The driving unit synchronizes a first driving signal related to the power supply with a second driving signal related to the sensing, and performs the first sensing in the sensor unit when the power of the infrared generating unit is ON. When the power of the infrared ray generator is OFF, the infrared generator may be driven to perform the second sensing by the sensor unit.

The sensor unit may obtain a first image by sensing the first infrared ray and the external light source, and obtain a second image by sensing the second external light source.

The touch screen device further includes a processor that recognizes the touch by the sensor unit using a difference between the first sensing result, the acquired first image and the second sensing result, and the obtained second image. .

In accordance with another aspect of the present invention, there is provided a method of operating a touch screen device, the method comprising: scattering infrared rays generated by an infrared ray generator in connection with a touch, first sensing the infrared rays and an external light source, and obtaining a first image; Sensing a light source to obtain a second image, and recognizing the touch by using the first and second images.

According to an exemplary embodiment of the present invention, the screen unit controls the power of the infrared generating unit generating infrared rays, compares the first image obtained when the power is on and the second image obtained when the power is off, and touches the screen unit. By recognizing, the accuracy of touch recognition can be increased.

1 is a diagram illustrating a configuration of a touch screen device according to an embodiment of the present invention.
2 is a diagram illustrating an example of a touch screen device according to an embodiment of the present invention.
3 is a diagram illustrating an example of a driving signal generated by a touch screen device according to an embodiment of the present invention.
4 is a flowchart illustrating a method of operating a touch screen device according to an embodiment of the present invention.

Hereinafter, a touch screen device and a method of operating the touch screen device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a diagram illustrating a configuration of a touch screen device according to an embodiment of the present invention.

Referring to FIG. 1, the touch screen device 100 according to an embodiment of the present invention may include a screen unit 101, an infrared ray generating unit 103, a sensor unit 105, a driving unit 107, and a processor 109. Include. In addition, the touch screen device 100 according to an embodiment of the present invention may further include a projector (not shown).

The screen unit 101 may be, for example, formed in a plane or curved surface, and may be positioned perpendicular to the ground, and scatters infrared rays generated from the infrared generating unit 103 in response to a touch of an object (eg, a finger) on the surface. Let's do it.

The screen unit 101 may have an infrared screen, plate or film form that is involved in scattering infrared rays when an object (such as a finger) contacts a predetermined region in or near the surface. Here, the infrared screen is an infrared film screen formed invisibly by irradiating infrared rays into the air, and an image may be projected by illuminating the beam projector.

As an example, a method used for implementing a multitouch screen may be classified into five types.

① FTIR (Frustrated Total Internal Reflection)

-Use total reflection of light. Total reflection refers to a phenomenon in which all light is reflected at an interface when the incident angle is greater than a certain angle when incident from a dense medium (high refractive index) to a small medium (small refractive index). As shown in FIG. 1, when a finger touches an infrared-flowing screen, light is diffusely reflected downward and the reflected light is recognized by an infrared camera.

Example Figure 1

Figure 112011089121018-pat00001

② DI (Diffused Illumination)

The DI method is divided into two types. That is, it is divided into Rear DI and Front DI according to the direction of infrared rays.

[Rear DI]

-Infrared light shines from below the screen and when the screen is touched, the light is reflected around the touch point and recognized by the infrared camera.

Example Figure 2

Figure 112011089121018-pat00002

[Front DI]

Infrared light shines on top of the screen (uses infrared light from the surrounding environment). When the screen is touched, shadows are generated, which are recognized by the infrared camera.

Example Figure 3

Figure 112011089121018-pat00003

③ LLP (Laser Light Plane Illumination)

-Infrared laser with a wavelength of 780nm to 940nm, 1mm thick, horizontally on the screen. When the screen is touched, light is reflected and recognized by an infrared camera.

Example Figure 4

Figure 112011089121018-pat00004

④ DSI (Diffused Surface Illumination)

Basically, it is consistent with FTIR method and uses special acrylic. In this acrylic, thousands of tiny particles have a mirror-like effect, reflecting infrared light up and down the screen. When the screen is touched, light is reflected around the touch point and recognized as an infrared cam.

Example Figure 5

Figure 112011089121018-pat00005

⑤ LED-LP (LED Light Plane)

It is similar to LLP method but uses infrared LED instead of infrared laser. 3mm thin acrylic is used and the LED is installed around the screen higher. Light is reflected around the touched point and recognized by an infrared camera.

Example Figure 6

Figure 112011089121018-pat00006

The screen unit 101 is, for example,

Figure 112011089121018-pat00007
It may be formed of a material of an acrylic group having a functional group of the structure. In addition, the screen unit 101 may be formed of a glass material.

The infrared ray generating unit 103 may be, for example, positioned at the side of the screen unit 101 to generate infrared rays to the screen unit 101. The infrared ray generating unit 103 may be, for example, an infrared LED module or an array.

The sensor unit 105 may be positioned on the front or rear of the screen unit 101, and may acquire an image by sensing (shooting) at least one of the scattered infrared rays or an external light source. In this case, the sensor unit 105 may obtain a first image by first sensing an infrared ray and an external light source (sunlight including infrared rays, ultraviolet rays, etc.), and obtain a second image by second sensing the external light source. have. Here, the sensor unit 105 senses first when the power of the infrared ray generating unit 103 is ON while maintaining the ON by the second driving signal, and the infrared ray generating unit ( When the power of 103 is OFF, the second sensing may be performed.

In addition, the sensor unit 105 may be, for example, a camera, and video recording is possible.

The driving unit 107 generates a driving signal related to the power of the infrared generating unit 103 and the sensing by the sensor unit 105, and drives the infrared generating unit 103 and the sensor unit 105 according to the driving signal. Can be. In this case, the driving unit 107 may internally generate the first driving signal related to the power of the infrared ray generating unit 103 and the second driving signal related to the sensing by the sensor unit 105 based on the set reference. In this case, when one driving signal is input, another driving signal may be generated based on the input driving signal. That is, the driving unit 107 receives the sensing period signal of the sensor unit 105 (that is, the second driving signal related to the sensing of the sensor unit 105), and based on the input sensing period signal, the infrared generating unit ( Generate a power cycle signal (ie, a first driving signal associated with the power of the infrared ray generator 103) of the 103, or receive the power cycle signal, and generate a sensing cycle signal based on the input power cycle signal. You can also create

In addition, the driver 107 may be configured such that a period of the first driving signal associated with the power supply of the infrared ray generator 103 is n times n (n is a real number of two or more) of the second driving signal associated with the sensing of the sensor unit 105. One or two drive signals can be generated.

Specifically, the driving unit 107 synchronizes the first driving signal with the second driving signal, so that the power of the infrared ray generating unit 103 and the ON of the sensor unit 105 periodically coincide (or, turn on). Start time, on interval, and the like periodically). That is, the driving unit 107 synchronizes the first driving signal related to the power supply of the infrared ray generating unit 103 and the second driving signal related to the sensing of the sensor unit 105, thereby turning on the power of the infrared ray generating unit 103. ON) to perform the first sensing in the sensor unit 105 and to drive the second sensing in the sensor unit 105 when the power of the infrared ray generating unit 103 is OFF. Can be. Here, the driving unit 107 can control the blinking by turning the power of the infrared ray generating unit 103 ON or OFF.

In addition, while the driving unit 107 turns on and turns on the power supply of the infrared ray generating unit 103, a static lighting method or a temporal lighting method that continuously flows a constant current for the lighting of the infrared ray generating unit 103 continuously. It may include a driving voltage generation circuit designed to be a dynamic lighting method that repeats the flashing.

The projector may be located at the front or rear of the screen unit 101 to project an image on the screen unit 101.

The processor 109 may recognize the touch on the screen unit 101 by the sensor unit 105 using the first image obtained as a result of the first sensing and the second image obtained as a result of the second sensing. That is, the processor 109 uses the sensor unit 105 to determine the externality through the difference between the first image obtained as a result of the first sensing of the infrared light and the external light source and the second image obtained as a result of the second sensing only the external light source. By removing the image of the light source and extracting the image of the infrared ray associated with the touch, it is possible to accurately recognize the touch on the screen unit 101.

In this case, when the first image and the second image are the same, the processor 109 displays the screen unit 101 when there is no difference between the first image and the second image (that is, when there is no image for infrared rays associated with the touch). May not recognize the touch.

The touch screen device according to an embodiment of the present invention may be installed at an angle of 0 degrees to 180 degrees.

2 is a diagram illustrating an example of a touch screen device according to an embodiment of the present invention.

2, the touch screen device 200 may include a screen unit 201, an infrared LED 203, a camera module 205, a driver 207, a processor 209, and a projector 211. .

The screen unit 201 scatters infrared rays generated from the infrared LED 203 in conjunction with the touch of an object (eg, a finger) with respect to the surface.

The infrared LED 203 may be positioned at the side of the screen unit 201 to generate infrared rays to the screen unit 201.

The camera module 205 may be located at the rear of the screen unit 201 and may acquire an image by sensing (or photographing) at least one of the scattered infrared rays or external light sources. In this case, the camera module 205 may first acquire a first image by first sensing an infrared ray and an external light source (sun light including infrared rays, ultraviolet rays, etc.), and obtain a second image by second sensing the external light source. have.

The driver 207 may generate driving signals related to power of the infrared LED 203 and sensing in the camera module 205, and may drive the infrared LED 203 and the camera module 205 according to the driving signal. . In this case, the driver 207 receives a sensing period signal (ie, a second driving signal related to sensing) generated by the camera module 205 and based on the sensing period signal, the power cycle of the infrared LED 203. Generate a signal (ie, a first driving signal associated with a power source). The driver 207 may be configured such that the period of the first driving signal associated with the power supply of the infrared LED 203 is n (n is a real number of two or more) times the second driving signal associated with the sensing of the camera module 205. The driving voltage circuit 207-1 may generate a driving signal.

In addition, the driving unit 207 includes a signal synchronization circuit 207-2 for synchronizing the first driving signal associated with the power supply of the infrared LED 203 and the second driving signal associated with the sensing of the camera module 205. When the power of the LED 203 is ON, the first sensing is performed in the camera module 205, and when the power of the infrared LED 203 is OFF, the camera 205 is activated. Drive to perform the second sensing. Here, the driving unit 207 can control the blinking by turning the power of the infrared LED 203 ON or OFF.

The projector 211 may be positioned at the rear of the screen unit 201 to project an image on the screen unit 201.

3 is a diagram illustrating an example of a driving signal generated by a touch screen device according to an embodiment of the present invention.

Referring to FIG. 3, the touch screen device may generate a first driving signal 301 associated with power of an infrared ray generator and a second driving signal 303 associated with sensing of a sensor unit. In this case, the touch screen device may generate the first and second driving signals such that the period of the first driving signal is n times n (n is a real number of two or more) of the second driving signal. That is, the touch screen device may include a first operation such that the frequency of turning on / off the power of the infrared generating unit is within 0.5 times (fps, when converted into cycles) within 0.5 times the frame rate per second (fps) of the sensor unit. , 2 driving signals can be generated.

For example, the touch screen device may acquire a first image by performing a first sensing in the sensor unit while turning on the power of the infrared ray generator, and at the sensor unit while turning off the power of the infrared ray generator. The second image may be obtained by performing a second sensing.

4 is a flowchart illustrating a method of operating a touch screen device according to an embodiment of the present invention.

Referring to FIG. 4, in operation 401, the touch screen device scatters infrared rays generated by the infrared ray generator in association with a touch on the screen unit.

In operation 403, the touch screen device senses at least one of scattered infrared rays or external light sources. That is, the touch screen device may obtain a first image by first sensing the infrared light and the external light source, and obtain a second image by second sensing the external light source.

Meanwhile, the touch screen device may generate driving signals related to power and sensing of the infrared generating unit and control the infrared generating unit and the sensing according to the driving signal. In this case, the touch screen device receives a second driving signal related to sensing, generates a first driving signal related to the power source of the infrared generating unit, or receives the first driving signal based on the input second driving signal, The second driving signal may be generated based on the input first driving signal.

In addition, the touch screen device may generate the first and second driving signals such that the period of the first driving signal associated with the power source of the infrared ray generator is n times (n is a real number of two or more) times the second driving signal associated with the sensing. . In addition, the touch screen device may control to perform the first sensing when the power of the infrared generator is ON, and to perform the second sensing when the power of the infrared generator is OFF.

In operation 405, the touch screen device may recognize a touch by using a first image acquired by first sensing an infrared ray and an external light source and a second image obtained by second sensing the external light source. That is, the touch screen device may accurately recognize the touch on the screen unit by removing the image of the external light source and extracting the image of the infrared ray associated with the touch through the difference between the first image and the second image.

An embodiment of the present invention by controlling the power of the infrared generating unit for generating infrared rays to the screen unit, by comparing the first image obtained when the power on and the second image obtained when the power off, by recognizing the touch on the screen unit The accuracy of touch recognition can be increased.

As an expanded embodiment of the present invention, a large display device including a multi-touch recognition display device including the touch screen device of the present invention may be arranged as necessary, and a large display device configured for interworking thereof may be considered. .

Embodiments of the present invention may be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer readable medium. The computer readable medium may include program instructions, data files, data structures, etc. alone or in combination. The program instructions recorded on the medium may be those specially designed and constructed for the present invention or may be available to those skilled in the art of computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tape, optical media such as CD-ROMs, DVDs, and magnetic disks, such as floppy disks. Magneto-optical media, and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like. Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like. The hardware device described above may be configured to operate as one or more software modules to perform the operations of the present invention, and vice versa.

As described above, the present invention has been described by way of limited embodiments and drawings, but the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and variations from such descriptions. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be determined by the equivalents of the claims, as well as the claims.

100: touch screen device
101: screen unit
103: infrared ray generating unit
105: sensor unit
107: drive section

Claims (14)

In relation to a touch, a first driving signal related to a power source of an infrared ray generating unit and a second driving signal related to sensing in a sensor unit are generated, and the infrared ray generating unit is generated according to the first driving signal and the second driving signal. A driving unit driving each of the sensor units
Lt; / RTI >
The driving unit includes:
Receiving the first driving signal and generating the second driving signal based on the input first driving signal, or
Receiving the second driving signal and generating the first driving signal based on the input second driving signal;
Touch screen device. The method of claim 1,
The touch screen device,
In response to the touch, the screen unit for scattering the infrared rays generated by the infrared ray generator
Further comprising:
The sensor unit includes:
Sensing at least one of the scattered infrared or external light sources
Touch screen device. The method of claim 1,
The driving unit includes:
The first driving signal and the second driving signal are generated such that the period of the first driving signal is n (n is a real number of 2 or more) times the period of the second driving signal.
Touch screen device. The method of claim 1,
The sensor unit while maintaining ON by the second driving signal,
When the infrared generator is powered on (ON), the first sensing,
When the infrared power is turned off, the second sensing
Touch screen device. 5. The method of claim 4,
The sensor unit includes:
Acquire a first image of an infrared ray and an external light source through the first sensing,
And a second image by sensing the external light source to obtain a second image. 5. The method of claim 4,
The touch screen device,
A processor that recognizes the touch by using a difference between the first image acquired through the first sensing and the second image obtained with the second sensing.
Further comprising, the touch screen device. The method of claim 1,
The driving unit includes:
And synchronizing the first driving signal with the second driving signal so that the power source of the infrared generating unit and the ON of the sensor unit are periodically matched. delete Scattering infrared rays generated by the infrared ray generator in association with the touch;
First sensing the infrared light and the external light source to obtain a first image, and second sensing the external light source to obtain a second image; And
Recognizing the touch by using the first image and the second image
Method of operation of the touch screen device comprising a. 10. The method of claim 9,
Generating a first driving signal associated with a power source of the infrared ray generator and a second driving signal associated with the first sensing and the second sensing; And
Controlling the power of the infrared ray generator, the first sensing, and the second sensing according to the first driving signal and the second driving signal;
Further comprising, the operation method of the touch screen device. The method of claim 10,
Wherein the generating comprises:
Generating the first driving signal and the second driving signal such that the period of the first driving signal is n (n is a real number of 2 or more) times the period of the second driving signal.
Including, the operation method of the touch screen device. The method of claim 10,
While maintaining ON by the second driving signal,
When the power of the infrared ray generator is ON, sensing the first sensor; And
Sensing the second sensor when the infrared generator is turned off
Further comprising, the operation method of the touch screen device. The method of claim 10,
Wherein the generating comprises:
Receiving the first driving signal and generating the second driving signal based on the input first driving signal; or
Receiving the second driving signal and generating the first driving signal based on the input second driving signal;
Including, the operation method of the touch screen device. 10. The method of claim 9,
Recognizing the touch,
Recognizing the touch by using a difference between the first image and the second image
Including, the operation method of the touch screen device.
KR1020110117369A 2011-11-11 2011-11-11 Touch screen apparatus and method for operating touch screen apparatus KR101293833B1 (en)

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KR1020110117369A KR101293833B1 (en) 2011-11-11 2011-11-11 Touch screen apparatus and method for operating touch screen apparatus
PCT/KR2012/009445 WO2013070012A1 (en) 2011-11-11 2012-11-09 Touch screen device and operation method of touch screen device

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KR20150019352A (en) * 2013-08-13 2015-02-25 삼성전자주식회사 Method and apparatus for grip recognition in electronic device

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US20110122091A1 (en) 2009-11-25 2011-05-26 King Jeffrey S Methods and apparatus for sensing touch events on a display
KR20110056892A (en) * 2009-11-23 2011-05-31 삼성전자주식회사 Multi touch detecting apparatus for lcd display unit and multi touch detecting method using the same
KR20110066152A (en) * 2008-09-26 2011-06-16 휴렛-팩커드 디벨롭먼트 컴퍼니, 엘.피. Determining touch locations using disturbed light

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Publication number Priority date Publication date Assignee Title
US20100060611A1 (en) 2008-09-05 2010-03-11 Sony Ericsson Mobile Communication Ab Touch display with switchable infrared illumination for touch position determination and methods thereof
KR20110066152A (en) * 2008-09-26 2011-06-16 휴렛-팩커드 디벨롭먼트 컴퍼니, 엘.피. Determining touch locations using disturbed light
KR20110056892A (en) * 2009-11-23 2011-05-31 삼성전자주식회사 Multi touch detecting apparatus for lcd display unit and multi touch detecting method using the same
US20110122091A1 (en) 2009-11-25 2011-05-26 King Jeffrey S Methods and apparatus for sensing touch events on a display

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