KR20120025335A - Infrared touch screen devices - Google Patents

Abstract

PURPOSE: An infrared ray touch screen device is provided to reduce the number of light emitting devices and to reduce power consumption. CONSTITUTION: First and second light guiding bars(27, 31) are installed in one side of a light scanner of a screen. The first and second light guiding bars reflect light from the light scanner. The first and second light guiding bars divides the reflected light to first and second side directions. First and second light guiding parts are installed to be faced with the first and second light guiding bards of the screen. The first and second light guiding parts sense the light of the first and second light guiding parts.

Description

Infrared touch screen device {INFRARED TOUCH SCREEN DEVICES}

The present invention relates to a touch screen device, and more particularly, to a touch screen device using infrared light.

A touch screen device is a device that detects a location by contacting an object such as a human hand or a pen with a character or a specific icon displayed on a screen without using an input device such as a mouse and processes a specific function.

The infrared touch screen device basically includes a touch panel, a controller, and software. The touch panel determines whether a hand or an object is touched, detects input coordinates, and sends a signal to the controller. The controller is transmitted from the touch panel. It converts the on-signal into a digital signal and outputs the coordinates on the screen, and the software receives the digital signal from the controller so that the touch panel can be implemented for each operating system.

Infrared touch screen devices are classified into a resistive method, a capacitive method, an ultrasonic method, and an infrared method according to an implementation method. In general, a resistive method and a capacitive method are mainly used.

The resistive touch panel has a structure in which two transparent conductive films (ITOs) coated with transparent electrodes are stacked, and an electric signal is generated when the upper and lower electrode layers are contacted by applying pressure with a finger or a pen. The capacitive touch panel is a method in which a protective film is covered on a conductive film that detects a touch by using static electricity generated by a human body, and transmits the detected contact information to the display panel below the film. to be.

However, since the resistive touch panel is not multi-touch and directly pressurized, scratches may occur on the surface, resulting in durability and component problems. Also, since the film used as the conductive film has low transmittance, the image quality is low. It is lowered and there is difficulty in medium / large size of 10 inches or more.

In addition, the capacitive touch panel cannot be used as an input means such as a touch pen which does not flow electricity, and parts having high manufacturing cost must be used in order to enable multi-touch with low recognition rate and precision according to moisture or surrounding environment. .

In contrast, an infrared touch panel is provided with an anti-reflective acrylic plate on the front of the display unit, and includes an light emitting element and a light receiving element at upper, lower, left, and right sides of the edge to form an infrared matrix. The rear part is configured to have a screen installed.

In the infrared touch panel, when a user touches an infrared matrix formed by a light emitting element and a light receiving element with any object regardless of an object such as a finger or a pen, the infrared ray of the portion is blocked to recognize the touched position. It is easy to enlarge the screen.

An infrared touch screen device using infrared light according to the prior art is disclosed in Korean Patent Publication No. 2010-66671 (name of the invention: touch display device).

The infrared touch screen device according to the prior art includes a touch panel, first and second light guide plates, first and second light emitting parts, and first and second light receiving parts.

The touch panel is formed of a transparent panel and positioned above the display panel to transmit and display an image of the display panel. The touch panel emits light from the first and second light emitting parts and passes through the first and second light guide plates at regular intervals. Therefore, when an object such as a user's finger or pen contacts the touch panel, light passing through the corresponding part is blocked, and infrared rays flowing therein are not incident on the corresponding light receiving elements of the first and second light receiving units. Find out location information.

However, since the infrared touch screen device according to the prior art has at least two light emitting devices, not only the structure is complicated but also the power consumption is large.

Accordingly, an object of the present invention is to provide an infrared touch screen device capable of reducing the number of light emitting devices and light receiving devices.

Another object of the present invention is to provide an infrared touch screen device capable of reducing power consumption.

Infrared touch screen device according to the present invention for achieving the above object is a screen that the user can touch and view the image, and is installed in one corner portion of the screen to emit light emitted from one light emitting element And a light scanner, which is installed at a side adjacent to the light scanner of the screen and splits the light incident on the light scanner by a plurality of patterns, thereby splitting the light scanner toward the first and second side surfaces of the screen. And a light guide bar exiting the light guide bar, and a light reception unit installed to face the light guide bar of the screen to receive and detect light emitted from the light guide unit.

In the light scanner, the light emitting device, the motor, and a reflector which is connected to the motor by a link and is formed in a gently curved cylinder to split the light incident from the light emitting device and exit the light guide bar; It includes an angle detector for detecting the rotation angle of.

In the light scanner, the light emitting device, an active unit having two active electromagnets having magnetic force by being alternately applied to a power source under the control of a control unit, installed at an edge of the screen, and two of the active unit Two passive electromagnets, which correspond to the active electromagnets in alternating contact, are installed, and a passive part swinging from side to side by magnetic force, and a cylindrical shape having a radius of curvature, bent smoothly by being attached to the passive part. And a reflector for scanning the light emitted from the light emitting device with the light guiding bar at regular intervals, and an angle detector for detecting a swing angle of a passive part swinging from the active part to the left and right.

The reflector has a mirror surface on an inner surface and includes first and second openings that split light incident from the light emitting device and exit the light guide bar.

In the above, the first and second openings emit the divided light to have an angle of 90 degrees.

The plurality of patterns of the light guide bar has the same number as the plurality of light receiving elements of the light receiving unit.

The light guide bar is installed to face the light guide bar, and receives the light emitted from the guinea pig and propagates to the light receiver, and a light receiver to sense the propagated light.

In the above, the light guide portion has a sawtooth-shaped constant pattern portion formed on the surface in contact with the screen.

The light guide unit further includes a reflective plate wrapped with a letter 'G' except for a surface in contact with the screen.

Therefore, the infrared touch screen device according to the present invention has the advantage of not only reducing the number of light emitting devices and light receiving devices, but also reducing power consumption.

1 is a block diagram of an infrared touch screen device according to the present invention.
2 is a block diagram of an optical scanner according to an embodiment of the present invention shown in FIG.
3 is an enlarged view of the light guide bar shown in FIG. 1;
4 is a configuration diagram of an optical scanner according to a second embodiment of the present invention.
5 is a plan view of an infrared touch screen device according to a third embodiment of the present invention.
FIG. 6 is a side view of the light guide of FIG. 5 viewed from the side. FIG.

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

1 is a block diagram of an infrared touch screen device according to the present invention, Figure 2 is a block diagram of an optical scanner according to an embodiment of the present invention shown in Figure 1, Figure 3 is a light guide bar of Figure 1 It is an enlarged view.

Referring to FIGS. 1 to 3, an infrared touch screen device according to the present invention is used to scan an entire area of the screen 11 with an infrared laser beam, and includes an optical scanner 13, a first light guide bar and a second light guide bar ( 27, 31, and first and second light receivers 33, 37.

The screen 11 is a part that is touched by an object such as a finger or a pen by a user and is formed of a flexible panel. In addition, the screen 11 is formed of a transparent material so that the image is transmitted through the user.

The light scanner 13 is installed at one corner of the screen 11 to emit an infrared laser beam. The optical scanner 13 according to an embodiment of the present invention is connected by a link to be driven by the micro motor 23 as shown in FIG. 2, and has a gently curved cylindrical reflector 17. And an angle detector 25 for detecting the rotation angles of the light emitting element 15 and the reflector 17.

The light emitting device 15 is an infrared laser diode and is fixedly spaced apart from the reflector 17 by a predetermined distance. The reflector 17 has a mirror surface formed on an inner surface thereof, and first and second openings 19 and 21 for emitting light to the outside are formed.

The reflector 17 guides a laser beam of infrared light emitted from the light emitting element 15 to be incident therein, and exits through the first and second openings 19 and 21 to the outside. The two openings 19 and 21 are formed so that the light emitted from each has an angle of 90 degrees.

The reflector 17 also emits a respective laser beam through the first and second openings 19 and 21, rotating left and right by a link connected to the motor 23, which first and second openings ( Each of the laser beams, which are split through 19 and 21, is emitted so as not to deviate from the side surfaces of the first and second light guide bars 27 and 31.

Then, the angle detector 25 detects the rotation angle of the reflector 17.

The first and second light guiding bars 27 and 31 are formed of an acrylic material and are installed on the side of the screen 11 adjacent to the light scanner 13 so that the light emitted from the light emitting element 15 can be screen 11. Let go.

As shown in FIG. 3, the first light guide bar 27 emits light from the light emitting element 15 and exits through the first opening 19 of the reflector 17 to guide light incident through one end face toward the other end face. And a pattern 29b for emitting light guided by the guide 29a toward the first side of the screen 11 (surface facing the second light receiving portion described later). The light guided by the first light guide bar 27 is emitted toward the first side surface of the screen 11 and the surface on which the pattern 29b is formed should be formed on the rear surface of the first light guide bar 27.

In addition, since the first light guide bar 27 splits the light and emits a plurality of lights toward the first side of the screen 11, the plurality of patterns 29b are downwardly disposed at intervals with the guide 29a interposed therebetween. It should be formed in an inclined multistage form. Since the guided light and the emitted light have an angle of 90 °, the first light guide bar 27 has a predetermined angle θ, that is, about 45 degree angle with the emitted light. desirable.

The second light guide bar 31 is installed to be perpendicular to the first light guide bar 27 and is emitted through the second opening 21 so that light incident through one end surface is perpendicular to the first side of the screen 11. It emits toward two side surfaces (faces facing the first light receiving portion described later) and has the same structure as the first light guide bar 27.

Therefore, each light emitted from the first and second light guide bars 27 and 31 and divided into a plurality of light forms a grid on the screen 11. Accordingly, when the user touches the screen 11 with an object such as a finger or a pen, light of the first and second light guide bars 27 and 31 passing through the touched grid point is blocked.

The first and second light receiving units 33 and 37 are formed of a plurality of first and second light receiving elements 35 and 39, respectively, and the first and second light guide bars 27 and 31 of the screen 11 are formed. Is installed on the side which is not installed. In the above, the first and second light receiving units 33 and 37 detect a plurality of lights emitted from the first and second light guide bars 27 and 31, respectively, and the first light receiving unit 33 is the second light guide. Facing the bar 31, the second light receiving portion 37 is installed to face the first light guide bar (27). Each of the plurality of first and second light receiving elements 35 and 39 constituting the first and second light receiving units 33 and 37 may have a pattern 29b of the first and second light guide bars 27 and 31. It is preferable to be configured in the same number and position.

As described above, the infrared touch screen device according to the present invention divides and enters the first and second light guide bars 27 and 31 by using one light emitting device 15, thereby not only reducing the number of light emitting devices. Power consumption can be reduced.

In the infrared touch screen device according to the present invention having the above-described configuration, the optical scanner 13 rotates the reflector 17 by the motor 23 while the light emitting element 15 is operated. Accordingly, the light emitted from the light emitting element 15 is incident into the reflector 17 and is divided into the first and second light guide bars 27 and 31 through the first and second openings 19 and 21 to be emitted. do. At this time, the angle detector 25 detects the rotation angle of the reflector 17. In the above, the first and second openings 19 and 21 move in one end surface of the first and second light guide bars 27 and 31, respectively, to prevent light from leaking to the outside.

Accordingly, the light split and divided into a plurality of light beams by the first and second light guide bars 31 respectively travels in the first and second side directions of the screen 11 while forming a lattice shape on the screen 11. And a plurality of first and second light receiving elements 35 and 39 constituting the second light receiving units 33 and 37 detect the light when the advanced light is incident. At this time, when the user touches the screen 11 with an object such as a finger or a pen, light passing through the touched grid point is blocked, and the corresponding one of the plurality of first and second light receiving elements 35 and 39 is light. Because it does not detect the position of the touch point can be detected.

4 is a light scanner 13 of the infrared touch screen device according to the second embodiment of the present invention is the active portion 43, the passive portion 49, the light emitting element 41, the reflector 55 and the angle detector 61 It consists of.

In the above, the active part 43 is composed of the first and second active electromagnets 45 and 47, and the passive part 49 is composed of the first and second passive electromagnets 51 and 53 and is formed of the active part ( 43 is hinged.

The first and second active electromagnets 45 and 47 constituting the active portion 43 are alternately applied with power by the control of a controller (not shown) to have magnetic force. Accordingly, the first and second passive electromagnets 51 and 53 constituting the passive part 49 are alternately contacted with the first and second active electromagnets 45 and 47 having magnetic force. The eastern part 49 swings from side to side.

In the above description, the first and second active electromagnets 45 and 47 and the first and second passive electromagnets 51 and 53 are described as being wrapped with a winding of a metal used as a magnet, but the present invention selectively uses metal. It can also be formed with only windings.

The reflector 55 is attached to the passive part 49 and is curved to form a cylindrical shape having a radius of curvature. In the reflector 55, a mirror surface is formed on an inner surface of the reflector 55, and first and second openings 57 and 59 are formed to emit the guided light to the outside.

The reflector 55 guides the laser beam of infrared light emitted from the light emitting element 41 and is incident therein, and is emitted to the outside through the first and second openings 57 and 21. The two openings 57 and 59 are formed so that the light emitted from each has an angle of 90 degrees.

The angle detector 61 is the first and second passive electromagnets 51 of the passive part 49 swinging from side to side by the first and second active electromagnets 45 and 47 of the active part 43. A swing angle of 53 is detected.

FIG. 5 is a plan view of an infrared touch screen device according to a third embodiment of the present invention, and FIG. 6 is a side view seen from the side of the light guide part.

FIG. 5 is an infrared touch screen device according to a third embodiment of the present invention, except for the first and second light guiding parts 133 and 137 and the light receiving part 135, which are identical to those of the first embodiment.

The first and second light guiding portions 133 and 137 are installed to correspond to positions facing the first and second light guiding bars 27 and 31 and are disposed at the first and second light guiding bars 27 and 31. The light receiving unit 135 for receiving the emitted light is configured as 135.

Here, the first and second light guide parts 133 and 137 have a sawtooth-shaped constant pattern part 140 formed on a surface in contact with the screen, and a reflecting plate wrapped around the letter 'C' except for the surface in contact with the screen 11. The light incident on the light beam 150 propagates and the light receiving unit 135 installed at the corner of the screen 11 corresponding to the light scanner 13 receives and detects the light propagated.

As described above, the present invention is only one embodiment, and the present invention is not limited to the above-described embodiments, and various modifications may be made by those skilled in the art within the technical spirit of the present invention. It is possible.

11: screen 13: light scanner
15 light emitting element 17 reflector
19: first opening 21: second opening
25 angle detector 27 first light guide bar
29a: Guide 29b: Pattern
31: second light guide bar 33: first light receiving part
37: second light receiving unit

Claims (9)

A screen that users can touch and project images,
An optical scanner installed at one corner of the screen and dividing the light emitted from one light emitting device;
A light guide bar installed at a side of the screen adjacent to the light scanner and split into a plurality of patterns to reflect light incident to the first and second side surfaces of the screen by emitting light split and incident from the light scanner; ,
And a light receiver configured to face the light guide bar of the screen to receive and detect light emitted from the light guide. The method according to claim 1, The optical scanner,
The light emitting element, the motor,
A reflector, which is connected to the motor and driven to rotate, is formed in a gently curved cylinder and divides the light incident from the light emitting device and emits the light to the light guide bar;
Infrared touch screen device including an angle detector for detecting the rotation angle of the reflector. The method according to claim 1, The optical scanner,
The light emitting device;
An active part installed at an edge of the screen and having two active electromagnets having magnetic force by being alternately supplied with power by the control of a controller;
A passive part swinging from side to side by magnetic force, having two passive electromagnets installed in contact with each other in correspondence with the two active electromagnets of the active part;
A reflector attached to the passive part and curved to form a cylindrical shape having a radius of curvature to scan and emit light emitted from the light emitting device at regular intervals into the light guide bar;
Infrared touch screen device including an angle detector for detecting the swing angle of the passive portion swinging left and right by the active portion. The infrared touch screen device as set forth in claim 2 or 3, wherein the reflector has a mirror surface on an inner surface thereof and includes first and second openings that split light incident from the light emitting device and exit the light guide bar. The infrared touch screen device of claim 4, wherein the first and second openings emit the split light at an angle of 90 °. The infrared touch screen device of claim 1, wherein a plurality of patterns of the light guide bar has the same number as a plurality of light receiving elements of the light receiving unit. Claim 1
A light guiding part installed to face the light guiding bar and receiving the light emitted from the light guiding bar and propagating to the light receiving part;
Infrared touch screen device including a light receiving unit for detecting the propagated light. The infrared touch screen device as set forth in claim 7, wherein the light guide portion has a tooth-shaped constant pattern portion formed on a surface in contact with the screen. The infrared touch screen device as set forth in claim 7, wherein the light guide part further includes a reflective plate surrounded by a letter 'c' except for a surface in contact with the screen.

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