KR101784517B1 - Optical touch screen and method for assembling the same - Google Patents

Abstract

The present invention relates to an optical touch screen and a method of assembling the same.
That is, the optical touch screen of the present invention includes a flat panel display panel; A case having the flat panel display panel mounted thereon; A bracket assembled to the case; A camera module mounted on the bracket; And an ultrasonic sensor for sensing an object approaching the proximity of the flat panel display panel.

Description

TECHNICAL FIELD [0001] The present invention relates to an optical touch screen and a method of assembling the same.

The present invention relates to an optical touch screen and a method of assembling the same.

There are two types of touch screens: Resistive type, Capacitive type, Optical type, Ultrasonic type, Electromagnetic type and Vector Force type. Each method has advantages and disadvantages.

In summary, the resistive method is a method in which a transparent conductive film between two substrates is in contact with each other. This method is easiest to implement and touches on the touch screen method so far, but its mechanical and environmental reliability is poor. have.

The ultrasonic method is also disadvantageous in that it is vulnerable to noise or noise of the factory by discriminating the position when the sound wave path between the sound wave generating element and the sound wave recognizing element is blocked similar to the optical sensor method.

The electromagnetic method uses the Faraday's law of magnetism and electromotive force generation principle, and calculates the coordinates by judging the amount of current flowing through the coil for each position. Since the AC signal must be applied to the coil, special special pen is required.

The electrostatic capacitance method has a disadvantage in that it is vulnerable to a noise signal by detecting a minute current flowing in accordance with a change in capacitance between a sensor electrode and a finger to determine a position. However, the electrostatic capacitance method is strong against environmental reliability and changes the upper barrier layer Therefore, the mechanical reliability can be freely changed.

In principle, the optical system does not use a film or the like for touch recognition, so the transmittance is 100%. In addition, there is no occurrence of deterioration of reflection and luminance, blurring of display, and the like which appear when a touch panel of another type is attached.

The maintenance of transmissivity and luminance in the display is an important factor of quality and is suitable for such a high quality display configuration.

In addition, since the optical type touch panel is a type in which the coordinate detection method blocks the light, it is not detected by physical contact or electrical contact, so that no load is applied to the sensor. Accordingly, it is highly reliable and is used for factory monitoring, various automation devices, financial terminals, and the like, and it is advantageous in that the material such as a film or an ITO protective film is not used, and therefore, durability against scratches and external impacts is high.

The present invention solves the problem that the optical touch screen can be easily assembled and power consumption can be reduced.

According to the present invention,

A flat display panel;

A case having the flat panel display panel mounted thereon;

A bracket assembled to the case;

A camera module mounted on the bracket;

There is provided an optical touch screen including an ultrasonic sensor for sensing an object approaching a proximity of the flat display panel.

Further, the case has a rectangular ring shape.

Further, brackets on which the camera module is mounted are fixed to three inner corners of the rectangular ring-shaped case, and brackets on which the ultrasonic sensor is not mounted are fixed to one inner edge of the rectangular ring- .

Further, a retroreflector is mounted on the inner surface of the case between the brackets.

In addition, the camera module includes an infrared light emitting diode for emitting infrared light; An IR pass filter for passing only the infrared rays reflected by the recursive reflection plate; And a linear sensor for sensing an area where the infrared ray passed through the infrared ray pass filter is touched by incidence.

The flat panel display panel is one of an LCD (Liquid Crystal Display), an FED (Field Emission Display), a PDP (Plasma Display Panel), an EL (Electroluminescence), an OLED (Organic Light Emitting Diode)

In addition, when the ultrasonic sensor detects that an object is approaching the flat panel display panel, the camera module is operated.

According to the present invention,

Preparing a bracket on which the camera module is mounted, a bracket on which the ultrasonic sensor is mounted, and a case;

Fixing the brackets to the corners of the case;

Fixing the retroreflector to the case;

And mounting a flat panel display panel on the case.

Further, the case has a rectangular ring shape.

The fixing of the brackets to the corners of the case may be performed by fixing the brackets on which the camera module is mounted to three inner edges of the rectangular ring-shaped case, fixing the brackets to one inner edge of the rectangular ring- And fix the bracket on which the sensor is mounted.

The optical touch screen of the present invention has the effect of reducing power consumption by driving the camera module when an object approaches the proximity of the flat panel display panel using an ultrasonic sensor.

The optical touch screen of the present invention can easily mount the camera module through the bracket to the case and can easily assemble the retroreflective plate to the frame mounted on the case and realize that the operation elements of the optical touch screen So that it is possible to easily carry out the mechanical alignment for the purpose.

In addition, since the optical touch screen of the present invention does not require mounting the camera module and the retroreflective plate in an expensive tempered glass, the manufacturing cost can be reduced.

1 is a conceptual cross-sectional view illustrating an optical touch screen according to the present invention;
2 is a view for explaining a method of detecting coordinates of a specific region touched in an optical touch screen according to the present invention;
3A and 3B are schematic conceptual diagrams for explaining a linear sensor of an optical touch screen according to the present invention.
4 is a schematic perspective view for explaining a state in which the optical touch screen is fastened according to the present invention.
5 is a plan view schematically showing an optical touch screen according to the present invention.
6 is a schematic block diagram for explaining that a sensing signal is generated when a user approaches the ultrasonic sensor of the optical touch screen according to the present invention.
FIGS. 7A and 7B are schematic views for explaining the detection of the user's approach to the ultrasonic sensor in the optical touch screen according to the present invention; FIGS.
8 is a schematic plan view for explaining an example in which a camera module and an ultrasonic sensor are installed on an optical touch screen according to the present invention
9A to 9D are schematic plan views for explaining a method of assembling the optical touch screen according to the present invention

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a conceptual cross-sectional view illustrating an optical touch screen according to the present invention.

In the optical touch screen according to the present invention, the camera module 160 and the retroreflective plate 170 are mounted on the front surface of the flat panel display panel 200.

The camera module 160 includes an infrared ray emitting diode 100 for emitting infrared rays; An IR pass filter 130 for passing only infrared rays reflected by the recursive reflection plate 170; And a linear sensor 150 that senses an area where the infrared ray passed through the infrared ray passing filter 130 is touched by incidence.

Here, the objective lens 140 may be further provided for condensing the infrared ray passed through the infrared ray filter 130. In addition, the light emitted from the infrared ray emitting diode 100 may be emitted through the lens 110.

The retroreflective plate 170 reflects the infrared ray emitted from the infrared ray emitting diode 100, and the incident angle and the reflection angle of the infrared ray are the same.

Therefore, the infrared light emitting diode 100 of the camera module 160 emits infrared rays, and the generated infrared rays travel along the flat panel display panel 200 and are reflected by the retroreflective plate 170, Pass filter 130 of the optical filter 160.

The infrared ray passing filter 130 passes only the infrared rays reflected by the recursive reflection plate 170 and the infrared ray passed through the infrared ray passing filter 130 is incident on the linear sensor 150.

When the user touches an image displayed on the flat panel display panel 200 with a finger of the hand 250, the infrared ray is blocked in the touched area , A black spot is formed on the linear sensor 150, so that coordinates of the touched specific area can be detected.

A flat panel display panel is positioned below the IR light emitting diode 100 and the retroreflective plate 170. When the user touches a specific region of an image displayed on the flat panel display panel, A driving signal corresponding to the detected coordinates is generated and performs various functions including a screen change, a volume adjustment, a screen shift, a screen enlargement and reduction, and the like.

Here, the flat panel display panel may be applied as one of a liquid crystal display (LCD), a field emission display (FED), a plasma display panel (PDP), an electroluminescence (EL), an organic light emitting diode (OLED) have.

FIG. 2 is a view for explaining a method of detecting coordinates of a specific area touched in an optical touch screen according to the present invention. FIGS. 3a and 3b are schematic conceptual diagrams for explaining a linear sensor of an optical touch screen according to the present invention. to be.

The camera module of the optical touch screen may be installed in two or three corner areas of the flat panel display panel 200.

2, when the first and second camera modules 161a and 161b are installed in two corner areas 211 and 212 of the flat panel display panel 200, the flat panel display panel 200, The infrared rays are blocked in the touched region 250 and black spots are formed in the linear sensors of the first and second camera modules 161a and 161b.

Therefore, the linear sensor is able to detect coordinates of the touched specific area to the position of the black spot.

Each of the linear sensors 150a and 150b of the first and second camera modules 161a and 161b includes first through n-th sensing pixels 151, 152, 153, 154, and 155 as shown in FIGS. 3A and 3B.

At this time, when a predetermined area of the flat panel display panel 200 is touched, a black spot is formed in one of the first to n-th sensing pixels 151, 152, 153, 154 and 155.

Since the linear sensors 150a and 150b of the first and second camera modules 161a and 161b are installed at different positions from the touched area, the linearity of the linear camera 150a and 150b of the first camera module 161a, The sensing pixels of the sensor 150a and the sensing pixels of the linear sensor 150b of the second camera module 161b are highly likely to be located at different positions.

3A, the black spot 251 is formed on the second sensing pixel 152 in the linear sensor 150a of the first camera module 161a. As shown in FIG. 3B, The black spot 251 is formed on the fourth sensing pixel 154 in the linear sensor 150b of the camera module 161b.

2, the horizontal direction of the flat panel display panel 200 is defined as an x direction and the vertical direction is defined as a y direction. In the touch area 250, A first angle? 1 between the connection line S1 and the horizontal direction of the flat panel display panel 200 to the linear sensor 150a and a linear angle? 1 between the linear sensor 150a of the second camera module 161b 2 of the flat display panel 200 and the horizontal angle of the flat display panel 200 to the horizontal direction of the flat display panel 200 are determined to be equal to each other, Coordinates can be extracted.

The first angle? 1 and the second angle? 2 are changed according to the position of the touched region 250 and the first to n-th sensing pixels of the linear sensors 150a and 150b (151, 152, 153, 154, 155) are subdivided.

That is, each of the first to n-th sensing pixels 151, 152, 153, 154 and 155 of the linear sensors 150a and 150b corresponds to the changed first angle? 1 and second angle? 2.

Therefore, if a black spot is formed on one of the first to n-th sensing pixels 151, 152, 153, 154, and 155 of the linear sensors 150a and 150b of the first and second camera modules 161a and 161b, the coordinates (x, y) of the touched area 250 can be extracted because the first angle? 1 and the second angle? 2 can be known.

When the predetermined area 250 of the flat panel display panel 200 is touched, the coordinate extracting and computing part optically extracts the coordinates (x, y) of the touched area 250 by the above- May be included in the touch system.

FIG. 4 is a schematic perspective view illustrating a state in which an optical touch screen according to the present invention is fastened, and FIG. 5 is a plan view schematically showing an optical touch screen according to the present invention.

The optical touch screen according to the present invention is assembled by mounting the flat panel display panel 200 on a case 300.

Here, the case 300 may be referred to as a case top.

Further, the case 300 is realized as a square ring.

Camera modules 161a, 161b, and 161c are mounted on the edges of three square rings of the case 300, and an ultrasonic sensor 161d is mounted on one square ring corner.

That is, as shown in FIG. 5, the camera modules 161a, 161b, and 161c and the ultrasonic sensor 161d are positioned at the edges of the flat panel display panel 200.

Therefore, the camera modules 161a, 161b, and 161c detect the coordinates of the touched area, and the ultrasonic sensor 161d detects that objects are approaching the proximity of the flat panel display panel 200. [

6A and 6B are schematic block diagrams for explaining how a sensing signal is generated when a user approaches the ultrasonic sensor of the optical touch screen according to the present invention. Fig. 2 is a schematic diagram for explaining how to detect a user's access to a sensor; Fig.

The optical touch screen includes an ultrasonic sensor 256 for detecting the object or user 255 approaching the flat panel display panel and outputting a signal; And a touch sensor 257 for receiving an output signal from the ultrasonic sensor 256 to perform an operation and sensing a touched area of the flat panel display panel.

When the touch sensor 257 senses a touched area of the flat panel display panel, the touch sensor 257 outputs a touch sensed signal to the microcomputer 258, And the coordinate of the touched area of the flat panel display panel is extracted by a signal sensed by the touch sensor 257.

At this time, the above-described camera module is responsible for the touch sensor 257.

7B, when the ultrasonic sensor 256 senses that the object approaches the flat panel display panel, the ultrasonic sensor 256 outputs a signal and the touch sensor 257 inputs the signal It is turned on and ready to detect the touch.

That is, the touch sensor 257 is driven to set a reference signal when an object approaches the flat panel display panel.

More specifically, the camera module, which is the touch sensor 257, drives the infrared light emitting diodes when an object or the user 255 approaches the flat panel display panel, emits infrared rays to the flat panel display panel, And receives a reflected infrared ray to set a reference signal in which the flat panel display panel is not touched.

Here, when the object or the user 255 approaches within a predetermined distance of the flat panel display panel, the ultrasonic sensor 256 detects that the object or the user 255 is approaching.

Also, as shown in FIG. 7A, when the object moves away from the flat panel display panel by a predetermined distance, the camera module is turned off and is not driven.

Therefore, the optical touch screen of the present invention is advantageous in that power consumption can be reduced by driving the camera module when an object approaches the proximity distance of the flat panel display panel using the ultrasonic sensor.

8 is a schematic plan view illustrating an example in which a camera module and an ultrasonic sensor are installed on an optical touch screen according to the present invention.

As shown in FIG. 8, a rectangular ring-shaped case 300 is mounted on the flat panel display panel.

At this time, a retroreflective plate 170 is mounted on the inner side of the case 300, camera modules 161a, 161b and 161c are mounted on the edges of the case 300, The ultrasonic sensor 161d is mounted at the corner of the ultrasonic sensor 160a.

The camera modules 161a, 161b and 161c and the ultrasonic sensor 161d are mounted on the brackets 271, 272, 273 and 274 and the brackets 271, 272, 273 and 274 are respectively attached to the square ring corners of the case 300 .

That is, the optical touch screen includes a flat panel display panel 200; A case 300 having a rectangular ring shape on which the flat panel display panel 200 is mounted and assembled; Brackets (271, 272, 273, 274) assembled at corners of the case (300); Camera modules (161a, 161b, 161c) mounted on the brackets (271, 272, 273, 274); And an ultrasonic sensor 161d mounted on one of the brackets 271, 272, 273, 274.

9A to 9D are schematic plan views for explaining an assembling method of an optical touch screen according to the present invention.

In the method of assembling the optical touch screen according to the present invention, as shown in FIG. 9A, a case 300 having a square ring shape is prepared.

Next, the brackets 271, 272, 273 to which the camera modules 161a, 161b, 161c are mounted are fixed to the three inner edges of the rectangular ring-shaped case 300, And the bracket 274 on which the ultrasonic sensor 161d is mounted is fixed to one inner edge (Fig. 9B)

The brackets 271, 272 and 273 on which the camera modules 161a, 161b and 161c are mounted are arranged such that the infrared rays are emitted from the camera modules 161a, 161b and 161c, Quot;).

Next, a frame 171 for fixing the retroreflective plate is mounted on the inner surface of the case between the brackets 271, 272, 273, 274 (FIG. 9C)

9C, the brackets 271, 272, 273, 274 refer to the brackets 271, 272, 273 on which the camera modules 161a, 161b, 161c are mounted and the brackets 274 on which the ultrasonic sensors 161d are mounted .

Subsequently, a retroreflective plate is fixed to the bracket 274 on which the frame 171 and the ultrasonic sensor 161d are mounted (FIG. 9D)

Here, the retroreflector may be fixed to the brackets 271, 272, 273 on which the camera modules 161a, 161b, 161c are mounted, without shielding the openings.

After the assembling process of FIG. 9D is performed, the flat panel display panel is mounted on the case 300.

It will be understood by 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.

Claims (10)

A case having a plurality of corners formed on its outer side;
A display panel disposed on the inside of the case and having a flat plate shape;
An ultrasonic sensor arranged at one corner of the plurality of corners and emitting an ultrasonic wave to the upper side;
A camera module disposed at the other corner of the plurality of corners; And
And a retroreflector disposed between the plurality of corners,
The camera module includes:
Light emitting diodes;
A filter which is emitted from the light emitting diode and transmits the light reflected from the recursive reflection plate; And
And a touch sensor for sensing light transmitted through the filter,
Wherein the touch sensor operates when an object or a user approaches the ultrasonic sensor and sets a reference signal.
delete The method according to claim 1,
The optical touch screen further comprising a plurality of brackets assembled corresponding to each of the plurality of corners.
delete delete The method according to claim 1,
Wherein the display panel is one of an LCD (Liquid Crystal Display), an FED (Field Emission Display), a PDP (Plasma Display Panel), an EL (Electroluminescence), an OLED (Organic Light Emitting Diode)
delete Preparing a case having a plurality of corners outside thereof;
Mounting an ultrasonic sensor for emitting an ultrasonic wave to an upper side of one of the plurality of corners and mounting the camera module to the other corner of the plurality of corners;
Mounting a retroreflector between the plurality of corners;
And mounting a flat panel display panel inside the case,
The camera module includes:
Light emitting diodes;
A filter which is emitted from the light emitting diode and transmits the light reflected from the recursive reflection plate; And
And a touch sensor for sensing light transmitted through the filter,
Wherein the touch sensor operates when an object or a user approaches the ultrasonic sensor and sets a reference signal.
delete The method of claim 8,
Further comprising the step of mounting a plurality of brackets on each of the plurality of corners after the step of preparing the case,
Wherein the ultrasonic sensor and the camera module are mounted on the bracket.

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