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KR20100056802A - Opto-touch screen - Google Patents

Opto-touch screen Download PDF

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Publication number
KR20100056802A
KR20100056802A KR1020080115783A KR20080115783A KR20100056802A KR 20100056802 A KR20100056802 A KR 20100056802A KR 1020080115783 A KR1020080115783 A KR 1020080115783A KR 20080115783 A KR20080115783 A KR 20080115783A KR 20100056802 A KR20100056802 A KR 20100056802A
Authority
KR
South Korea
Prior art keywords
light
touch screen
infrared
fluorescent material
infrared fluorescent
Prior art date
Application number
KR1020080115783A
Other languages
Korean (ko)
Inventor
전상렬
Original Assignee
삼성전기주식회사
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 삼성전기주식회사 filed Critical 삼성전기주식회사
Priority to KR1020080115783A priority Critical patent/KR20100056802A/en
Publication of KR20100056802A publication Critical patent/KR20100056802A/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
    • G06F3/0412—Digitisers structurally integrated in a display
    • 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
    • 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
    • G06F2203/04103—Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices

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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)
  • Liquid Crystal (AREA)

Abstract

The present invention provides a display panel having a plurality of pixels, an infrared fluorescent material disposed on each of the plurality of pixels and emitting light when exposed to infrared rays, and disposed on each of the plurality of pixels, wherein the infrared fluorescent material is disposed on the display panel. It is possible to provide an optical touch screen including an optical sensor for detecting a light emitting position.

Description

Optical touch screen {OPTO-TOUCH SCREEN}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical touch screen, and more particularly, to an optical touch screen that can be touched by infrared rays without physical contact using an infrared light emitting material that emits infrared rays.

Recently, with the rapid development of software, semiconductor technology, and information processing technology, various information devices such as mobile phones, PDAs, computers, etc. are gradually becoming multifunctional. In addition, information storage and communication through input of data, etc. in information devices Is also growing in importance.

Conventionally, in inputting data into the information device, a method of pressing an input key is used, but in recent years, a data input method using a touch screen on the information device has been increasing.

In general, a touch screen is an input device that replaces an input key, a keyboard, and a mouse. The touch screen is mounted on a screen and touched directly on the screen using a hand or a stylus pen to input data. It is a device that can. Here, the touch screen is a device capable of performing intuitive tasks in a GUI (Graphic User Interface) environment, which is suitable for a portable input device, and is widely used in computer simulation applications, office automation applications, education applications, and game applications. Can be.

The input device using the touch screen method basically includes a touch panel attached to a monitor, a controller, a device driver, and an application program. The touch panel is composed of several layers including an electrode glass (ITO glass) and an electrode film (ITO film) that are specially processed to detect a signal input by a user. By using the contact, the display position sensor may detect the contact position on the touch panel.

The touch screen using the touch panel has a problem that fingerprints or scratches remain on the surface of the touch panel because a hand or a stylus pen must be directly in contact with the touch panel. In addition, when the touch screen is applied to a large display, there is a problem in that operation is impossible at a long distance.

In order to solve the above problems, an object of the present invention is to provide an optical touch screen that can be optically touched by infrared light at a long distance without physical contact.

The present invention provides a display panel having a plurality of pixels, an infrared fluorescent material disposed on each of the plurality of pixels and emitting light when exposed to infrared rays, and disposed on each of the plurality of pixels, wherein the infrared fluorescent material is disposed on the display panel. It is possible to provide an optical touch screen including an optical sensor for detecting a light emitting position.

The display panel may include a first layer in which the infrared fluorescent material is disposed, a second layer in which the optical sensor is disposed, and a third layer including a liquid crystal crystal.

The first layer may include a sheet in which the infrared fluorescent material and the transparent material are blended.

The first layer may include a transparent material sheet and an infrared fluorescent material sheet stacked on the transparent material sheet, and the first layer may further include a transparent material sheet stacked on the infrared fluorescent material sheet. It may be.

The infrared fluorescent material may emit visible light or infrared light when exposed to infrared light.

The infrared fluorescent material may emit light of about 800 nm wavelength in response to light of about 900 nm wavelength.

The optical sensor may receive light emitted from the infrared fluorescent material and convert the light into current.

According to the present invention, it is possible to obtain an optical touch screen capable of optical touch by infrared rays even at a long distance without physical contact.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

1 is a perspective view of an optical touch screen according to an embodiment of the present invention.

Referring to FIG. 1, an optical touch screen according to the present embodiment includes a display panel 101 having a plurality of pixels, an infrared fluorescent material 111 disposed on each of the plurality of pixels, and emitting light when exposed to infrared rays, and the plurality of pixels. An optical sensor 121 may be disposed on each pixel to sense a light emitting position of the infrared fluorescent material on the display panel.

In the present embodiment, the display panel 101 may be an LCD (Liquid Crystal Display) panel. The LCD panel 101 may have a plurality of pixels and include an infrared fluorescent material and an optical sensor for detecting light emitted from the infrared fluorescent material for each pixel. Although the size of the pixel formed in the panel is largely illustrated in FIG. 1, in practice, the pixel of the LCD panel may have a size small enough to be invisible.

Referring to the cross-sectional view of the display panel 101, the LCD panel 101 includes a first layer 110 including an infrared fluorescent material, a second layer 120 on which an optical sensor is formed, and a liquid crystal crystal. The third layer 130 may be formed in a stacked structure.

The first layer 110 of the LCD panel 101 may include an infrared fluorescent material 111 that emits light when exposed to infrared light. The infrared fluorescent material may emit infrared light or visible light when exposed to infrared light. In the present embodiment, the infrared fluorescent material 111 may use a fluorescent material that emits light of about 800nm wavelength when exposed to light of about 900nm wavelength. The first layer 110 may be formed in a sheet form by mixing the infrared fluorescent material 111 with a transparent material such as glass or acrylic.

An optical sensor 121 may be formed on the second layer 120 of the LCD panel to detect a light emitting position of the infrared fluorescent material on the display panel. The optical sensor 121 may be disposed for each pixel of the LCD display panel 101 to receive light from the outside and generate a current according to the amount of light received. The LCD panel can obtain a captured image of the entire panel by the amount of current in each pixel. The positional coordinates of the light emitting area can be detected by analyzing the light intensity of incident light from the captured image.

Although not illustrated in detail, a thin film transistor may be formed in the second layer 120 to display an image in the LCD panel 101. The thin film transistor may be configured of an N-type thin film transistor and a P-type thin film transistor, which may apply a voltage for image display to the liquid crystal crystal layer 131. As described above, the thin film transistor formed on the second layer 120 turns on / off the pixel electrode by the instruction of the scan signal supplied to the scan line, and applies the image display voltage supplied to the signal line to the pixel electrode at an appropriate timing. I can display it.

The third layer 130 of the LCD panel may include a liquid crystal layer 131, and the liquid crystal crystal layer 131 faces the substrate 133 to the second layer 120. The liquid crystal crystal may be formed by filling the liquid crystal crystal at an interval formed by separating the spacer 132.

Hereinafter, the operation of the optical touch screen will be described.

The light touch screen 100 may be attached to a display device such as a TV. The display device may be connected to an application program in which a touch area for forming a touch screen is displayed.

The touch panel may be displayed on the display panel 101 by the application program. When an infrared ray is scanned on a touch area displayed on the display panel using a pointer or the like that emits infrared light from the outside, infrared light may be scanned on one area of the display panel corresponding to the touch area displayed on the display panel. The infrared fluorescent material distributed in one region of the first layer 110 of the display panel that receives the infrared light emits light. At this time, the wavelength of the light emitted may be variously implemented by the type of the infrared fluorescent material. In the present embodiment, the infrared fluorescent material may use a fluorescent material that emits light of about 800 nm wavelength in response to light of about 900 nm wavelength.

The light is emitted in a region where infrared rays are incident on the first layer 110 of the display panel, and the light sensor 121 formed on the second layer 120 of the display panel receives the emitted light. The optical sensor 121 may generate a current according to the intensity of the received light.

A light sensor formed on the entire pixel of the display panel may obtain a current value according to the amount of light received for each pixel on the entire surface of the display panel. Using this current value, a captured image of the entire display panel can be obtained. The light intensity of the incident light can be analyzed from the obtained captured image to detect the position coordinates of the light emitting area in the display panel 101. By using the position coordinates of the light emitting area, an appropriate light touch screen operation can be performed in the application program.

According to this embodiment, the optical touch screen is formed on the LCD panel, but since infrared rays are used without physical contact, unnecessary scratches or the like may not occur on the surface of the LCD device. In addition, the touch screen function can be conveniently performed at a long distance.

2A to 2C are cross-sectional views of first layers having different shapes in the display panel of the optical touch screen according to the present invention.

Referring to FIG. 2A, the first layer 210 of the display panel according to the present exemplary embodiment may be in the form of a sheet 211 in which an infrared fluorescent material and a transparent material are blended.

The transparent material may include glass or acrylic. In the present exemplary embodiment, the first layer of the display panel in the form of one sheet may be implemented by mixing the infrared fluorescent material and the transparent material in an appropriate ratio.

The infrared fluorescent material included in the light touch sheet 211 may be a fluorescent material that emits infrared or visible light when exposed to infrared light. The more the infrared fluorescent material is included in the optical touch sheet, the sensitivity of the optical touch screen may be sensitively controlled. In this embodiment, the infrared fluorescent material may be included in each pixel of the LCD panel in the same ratio.

Since the transparent material transmits visible light and the infrared fluorescent material does not react to visible light, the screen is covered by the light touch sheet when the user views the screen even when the light touch sheet 211 is attached to the LCD panel. The problem may not occur.

Referring to FIG. 2B, the first layer 310 of the display panel according to the present exemplary embodiment may have a form in which the infrared fluorescent material sheet 311 is stacked on the transparent material sheet 312.

The transparent material may include glass or acrylic. In the present embodiment, the transparent material sheet 312 can be formed using glass. The infrared fluorescent material sheet 311 formed on the transparent material sheet 312 may be a fluorescent material that emits infrared or visible light when exposed to infrared light.

In the present embodiment, when the first layer 310 of the display panel is mounted on the LCD, the infrared fluorescent material sheet 311 contacts the optical sensor of the LCD display panel and the transparent material sheet 312 is exposed to the outside. You can do that. Since the transparent material sheet 312 transmits visible light and does not react to infrared rays, a problem may not occur when the infrared light is incident on the infrared fluorescent material sheet 311 through the transparent material sheet 312.

Referring to FIG. 2C, the first layer 410 of the display panel according to the present exemplary embodiment may have a form in which an infrared fluorescent material sheet 411 is stacked between the transparent sheets 412 and 413.

The transparent material may include glass or acrylic. In the present embodiment, the transparent sheets 412 and 413 can be formed using glass. The infrared fluorescent material sheet 411 formed between the two sheets of transparent material 412 and 413 may be a fluorescent material that emits infrared or visible light when exposed to infrared light.

In the present embodiment, the infrared fluorescent material sheet 411 may not be exposed to the outside when the first layer 410 of the display panel is mounted on the LCD, so that the infrared fluorescent material is a main component of the light touch screen. The sheet 411 may be protected to extend the life of the display panel 410.

3 is a configuration diagram of a TV to which an optical touch screen according to an embodiment of the present invention is applied.

The TV 500 according to the present exemplary embodiment may include a television main body 570, a display panel 501, and a calculation unit 550, wherein the display panel 501 includes an infrared fluorescent material and an optical sensor for each pixel. Can be formed.

In recent years, the choice of viewing by two-way communication is possible in a home TV so that a user can select a desired program or search for desired information through a TV at home. For such two-way communication, a touch screen method may be applied to a home TV. When the conventional touch screen is applied to a home TV, it is necessary to directly touch the monitor using a hand or a pen, which may cause fingerprints or scratches on the TV screen. In addition, since users mainly watch TV at a certain distance away from the TV monitor, there may be a problem that must be moved frequently to directly touch the TV monitor.

In the TV 500 to which the optical touch screen according to the present embodiment is applied, the display panel 501 may be an LCD device. In the TV 500 to which the optical touch screen according to the present embodiment is applied, the display panel 501 in which the display area appears can be touched using the infrared pointer 560 in which infrared light is emitted. The infrared pointer 560 may emit infrared light. Since the infrared light is not light that is visible to the eye, the infrared pointer 560 may be manufactured to emit infrared light and visible light at the same time for the convenience of the user. That is, when the pointer 560 is formed to emit infrared light and visible light at the same point, the user may estimate the pointing position of the invisible infrared light by the pointing position of the visible light.

When an infrared ray is incident on the display panel 501, an infrared fluorescent material emitting light by infrared rays may emit light. The infrared fluorescent material may emit infrared light or visible light by infrared light. An optical sensor formed for each pixel of the display panel may detect light emitted from the infrared fluorescent material. The optical sensor may convert light emitted from the infrared fluorescent material into a current value.

The calculator 550 may calculate a light emitting position on the display panel 501 using the current value detected by the optical sensor. The light emitting position information calculated by the calculating unit is transmitted to a central processing unit that operates the monitor of the television, and determines whether to touch the touch area output to the monitor of the television based on the information, and proceeds to the next procedure.

As described above, when the optical touch screen is used for the television, unnecessary fingerprints and scratches can be prevented from occurring on the monitor of the television, and the touch screen method can be used at a long distance, so that the user's convenience can be achieved.

It is intended that the invention not be limited by the foregoing embodiments and the accompanying drawings, but rather by the claims appended hereto. It will be apparent to those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. something to do.

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

2A to 2C are cross-sectional views of various embodiments of the first layer of the display panel used in the optical touch screen according to the present invention.

3 is a configuration diagram of a TV to which an optical touch screen is applied according to one embodiment of the present invention.

<Code Description of Main Parts of Drawing>

101: display panel 111: infrared fluorescent material

121: light sensor

Claims (8)

A display panel having a plurality of pixels; An infrared fluorescent material disposed on each of the plurality of pixels and emitting light upon exposure to infrared light; And An optical sensor disposed on each of the plurality of pixels to sense a light emitting position of the infrared fluorescent material on the display panel; Light touch screen comprising a. The method of claim 1, The display panel, A first layer on which the infrared fluorescent material is disposed; A second layer in which the photosensor is disposed; And Third layer containing liquid crystal crystal The light touch screen, characterized in that stacked sequentially. The method of claim 2, The first layer, The infrared fluorescent material and a transparent material blended sheet Light touch screen comprising a. The method of claim 2, The first layer, Transparent sheet; And Infrared fluorescent material sheet laminated on the transparent material sheet Optical touch screen comprising a. The method of claim 4, wherein The first layer, Transparent material sheet laminated on the infrared fluorescent material sheet Optical touch screen further comprises. The method of claim 1, The infrared fluorescent substance, Optical touch screen, characterized in that the visible light or infrared light emitting when exposed to infrared light. The method of claim 1, The infrared fluorescent substance, An optical touch screen, characterized in that to emit light of about 800 nm wavelength in response to light of about 900 nm wavelength. The method of claim 1, The optical sensor, Optical touch screen, characterized in that for receiving the light emitted from the infrared fluorescent material and converting it into a current.
KR1020080115783A 2008-11-20 2008-11-20 Opto-touch screen KR20100056802A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020080115783A KR20100056802A (en) 2008-11-20 2008-11-20 Opto-touch screen

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020080115783A KR20100056802A (en) 2008-11-20 2008-11-20 Opto-touch screen

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KR20100056802A true KR20100056802A (en) 2010-05-28

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120041958A (en) * 2010-10-22 2012-05-03 삼성전자주식회사 Optical source assembly and touch screen device having the same

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120041958A (en) * 2010-10-22 2012-05-03 삼성전자주식회사 Optical source assembly and touch screen device having the same

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