KR101612152B1 - Optical touch screen - Google Patents

Abstract

The present invention relates to an optical touch screen.
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; Brackets assembled in the case; A camera module mounted on the brackets; And a diaphragm formed on the bracket and through which the infrared rays incident on the camera module pass.

Description

[0001] Optical touch screen [0002]

The present invention relates to an optical touch screen.

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, so that durability against scratches and external impacts is great and errors such as malfunction are low.

The present invention solves the problem of improving the sensitivity of touch recognition.

According to the present invention,

A flat display panel;

A case having the flat panel display panel mounted thereon;

Brackets assembled in the case;

A camera module mounted on the brackets;

An optical touch screen formed on the bracket and including a diaphragm through which infrared rays incident on the camera module pass.

The bracket includes first and second fixing portions fixed to the case; And a connection part connected to the first and second fixing parts, wherein the diaphragm is formed in the connection part.

The camera module is mounted on the connecting portion.

Further, guides are formed in the connection portion, and an infrared filter is fixed to the guides.

In addition, the diaphragm is blocked by the infrared filter, and infrared rays are incident on the camera module through the infrared filter and the diaphragm.

The connection part is formed with a passage through which the infrared ray emitted from the camera module passes.

In addition, an infrared ray emitting diode is mounted on the camera module, and infrared rays emitted from the infrared ray emitting diode are emitted to the upper portion of the flat panel display panel through the passage.

In addition, a lens is mounted on the passage.

A light-shielding protrusion is formed in a region of the connection portion of the bracket between the diaphragm and the lens.

In addition, the camera module includes an infrared light emitting diode for emitting infrared light; An objective lens for condensing the infrared rays reflected by the recursive reflection plate; An infrared pass filter for passing a specific wavelength band among the infrared rays condensed by the objective lens; And a linear sensor for sensing an area where the infrared ray passed through the infrared ray pass filter is touched by incidence.

The camera module may include a holder having a first groove formed on one side thereof and a second groove formed on the other side thereof and having an opening for connecting the first and second grooves, A printed circuit board on which the image sensor is mounted is attached to the holder so that the second groove is closed.

A stepped portion is formed on one side of the holder, and the infrared LED is mounted on the stepped portion.

In addition, the infrared pass filter is formed by coating an infrared pass filter material on a glass.

In addition, the case has a rectangular ring shape.

The bracket is attached to an edge of the case.

In addition, brackets on which the camera module is mounted are fixed to three inner edges of the rectangular ring-shaped case, and a dummy (not shown) having no camera module mounted on one inner edge of the rectangular ring- ) The bracket is fixed.

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

The optical touch screen according to the present invention has a diaphragm formed in a bracket on which a camera module is mounted, and thus it is not necessary to further include a diaphragm structure, thereby reducing manufacturing costs.

In the optical touch screen of the present invention, the light-shielding protrusion is formed in the area of the connection portion of the bracket between the diaphragm and the lens so that the infrared ray emitted from the LED leaks directly into the gap between the diaphragm and the lens, So that the touch sensitivity can be improved.

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 a case of an optical touch screen according to the present invention.
6A to 6D are schematic plan views illustrating a method of assembling an optical touch screen according to the present invention
7 is a schematic perspective view illustrating a bracket to which a camera module according to an embodiment of the present invention is attached.
8 is a schematic perspective view for explaining the mounting of the infrared filter and the lens on the bracket on which the camera module according to the present invention is mounted.
9 is a schematic front view for explaining a connection portion of a bracket to which a camera module according to the present invention is mounted;
10 is a schematic partial cross-sectional view for explaining a schematic configuration of a bracket and a camera module on which a camera module applied to the present invention is mounted

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 illustrating a case of 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.

5, the case 300 has a rectangular ring shape, and a retroreflective plate 170 is mounted on the inner side of the rectangular ring, and camera modules 161a, 161b, and 161c are mounted and assembled.

At this time, the camera modules 161a, 161b, 161c are mounted on the brackets 271, 272, 273, respectively, and the brackets 271, 272, 273 are mounted on the three rectangular ring corners of the case 300.

In addition, a dummy bracket 280 to which no camera module is mounted is mounted on the corner of the remaining rectangular ring.

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 assembled at the corners of the case 300; And camera modules 161a, 161b and 161c mounted on the brackets.

At least one of the brackets is a dummy bracket in which the camera modules 161a, 161b, and 161c are not mounted.

A retroreflective plate 170 is mounted on the inner surface of the case 300 between the brackets.

Also, the retroreflective plate 170 is attached to the dummy bracket 280.

6A to 6D are schematic plan views illustrating an assembly method of an optical touch screen according to the present invention.

In the method of assembling an optical touch screen according to the present invention, as shown in FIG. 6A, a case 300 having a rectangular 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, The dummy bracket 280 on which the camera module is not mounted is fixed to one inner corner (Fig. 6B)

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 and the infrared rays reflected by the recursive reflection plate are incident The dummy bracket 280 does not need the opening.

Next, a frame 171 for fixing the retroreflective plate is mounted on the inner surface of the case between the brackets 271, 272, 273, and 280 (FIG. 6C)

In the description of FIG. 6C, the brackets 271, 272, 273, and 280 refer to the brackets 271, 272, 273 on which the camera modules 161a, 161b, 161c are mounted and the dummy bracket 280 on which the camera module is not mounted.

Subsequently, a retroreflective plate is fixed to the frame 171 and the dummy bracket 280 (Fig. 6D)

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. 6D is performed, the flat panel display panel is mounted on the case 300.

7 is a schematic perspective view illustrating a bracket to which a camera module according to an embodiment of the present invention is attached.

The bracket 271 to which the camera module is mounted includes first and second fixing portions 271a and 271c fixed to the case; And a connection portion 271b connected to the first and second fixing portions 271a and 271c.

Here, the camera module is mounted on the connection portion 271b of the bracket 271. [

At this time, the connection portion 271b of the bracket 271 is provided with a diaphragm 276a for adjusting the amount of infrared rays incident on the camera module; And a passage 276b through which the infrared ray emitted from the camera module passes.

The position where the diaphragm 276a and the passage 276b are formed in the connecting portion 271b of the bracket 271 is not limited to the positions shown in Figures 7 to 10,

.

However, as shown in FIG. 10, the diaphragm 276a may be positioned below the passage 276b such that infrared rays are emitted from the upper portion and infrared rays are incident from the lower portion.

The bracket 271 on which the camera module is mounted is mounted on the edge of the case.

Therefore, the infrared rays emitted from the camera module are emitted through the passage 276b of the bracket 271, reflected by the retroreflective plate mounted on the case, and transmitted through the diaphragm 276a of the bracket 271 to the camera And is sensed as a touch.

At this time, the amount of infrared rays incident on the diaphragm 276a can be adjusted.

For example, when the size of the diaphragm 276a is small, the amount of infrared rays incident is larger than when the diaphragm 276a is small.

That is, the optical touch screen according to the present invention comprises 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; And a diaphragm formed on the bracket and through which the infrared rays incident on the camera module pass.

Therefore, the optical touch screen of the present invention has an advantage that the diaphragm is formed in the bracket on which the camera module is mounted, and the diaphragm structure is not additionally provided, thereby reducing the manufacturing cost.

FIG. 8 is a schematic perspective view illustrating an infrared filter and a lens mounted on a bracket on which a camera module according to an embodiment of the present invention is mounted. FIG. 9 is a perspective view illustrating a connection portion of a bracket Is a schematic front view.

9, guides 277a and 277b are formed in the connecting portion 271b of the bracket 271 corresponding to both side surfaces of the diaphragm 276a in the connecting portion 271b of the bracket 271, have.

An infrared filter 131 is mounted on the inner region E of the guides 277a and 277b and the infrared filter 131 is fixed by the guides 277a and 277b.

At this time, the diaphragm 276a is blocked by the infrared filter 131.

The infrared filter 131 can be applied to both infrared rays that pass only the infrared rays through the incident light or pass only the wavelengths of the specific band in the infrared rays.

8, an infrared filter 130 is mounted inside the guides 277a and 277b, and infrared rays passing through the infrared filter 131 pass through the diaphragm 276a.

The connection portion 271b of the bracket 271 is provided with a passage 276b through which the infrared rays emitted from the camera module pass. The lens 271 is mounted on the passage 276b.

That is, the camera module is equipped with an infrared ray diode, and the infrared ray emitted from the infrared ray diode is emitted to the upper portion of the flat panel display panel through the lens 110.

9, the optical touch screen of the present invention has a connecting portion 271b of the bracket 271 between the diaphragm 276a and a lens mounted on the passage 276b or the passage 276b, The infrared rays emitted from the lens 110 are prevented from being incident on the diaphragm 276a, thereby reducing the touch noise and improving the touch sensitivity.

10 is a schematic partial cross-sectional view for explaining a schematic configuration of a bracket and a camera module to which a camera module applied to the present invention is mounted.

First, the camera module of the present invention includes an infrared ray emitting diode 100 for emitting infrared rays A; An objective lens 140 for converging the infrared ray B reflected from the recursive reflection plate; An infrared ray passing filter 131 for passing a specific wavelength band of infrared rays B condensed by the objective lens 140; And a linear sensor 150 for sensing an area where the infrared ray passed through the infrared ray filter 131 is touched by incidence.

The infrared light emitting diode 100 corresponds to the lens 110 mounted on the passage 276b of the connection part 271b and the objective lens 140 is mounted on the connection part 271b of the bracket, Corresponds to the diaphragm 276a formed in the connecting portion 271b.

Therefore, the infrared ray A emitted from the infrared ray emitting diode 100 is emitted to the upper portion of the flat panel display panel through the lens 110, and the infrared ray B reflected from the recursive reflection plate is reflected by the diaphragm 276a, And is incident on the linear sensor 150 through the lens 140 and the infrared ray filter 131. [

Therefore, the size of the diaphragm 276a is determined by the amount of the infrared ray B incident on the linear sensor 150 after being reflected by the retroreflector.

10, a first groove 382 is formed on one side and a second groove 384 is formed on the other side of the camera module. And a holder 380 having a stepped portion 381 formed on one side of the first groove 382. The first groove 382 is formed with an opening 383 for connecting the first groove 382 and the second groove 382, The image sensor 150 is mounted on the printed circuit board 300 so that the second groove 384 is covered with the infrared ray passing filter 130 and the lens 140 is mounted on the second groove 384, And the infrared light emitting diode 100 is mounted on the stepped portion 281. The infrared light emitting diode 100 is mounted on the holder 380 in a stepped manner.

At this time, the infrared ray filter 131 may be formed by coating an infrared ray passing filter material on the glass.

The glass serves as a cover plate for protecting the image sensor.

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 (17)

A flat display panel;
A case having the flat panel display panel mounted thereon;
Brackets assembled in the case;
And a camera module mounted on the brackets,
Wherein the camera module includes a holder having a first groove formed on one side thereof and a second groove formed on the other side thereof and having an opening for connecting the first groove and the second groove,
A step portion is formed on one side of the holder, an infrared light emitting diode is mounted on the step portion,
A diaphragm for adjusting an amount of infrared rays incident on the camera module and a passage for passing infrared rays emitted from the infrared ray emitting diode of the camera module are formed in a connection portion of the bracket,
Wherein the connection portion of the bracket is provided with a light-shielding protrusion for preventing infrared rays emitted from the infrared light-emitting diode from being incident on the sensor.
The method according to claim 1,
The bracket
First and second fixing portions fixed to the case;
And a connection portion connected to the first and second fixing portions,
The diaphragm
And an optical touch screen formed on the connection portion.
The method of claim 2,
The camera module includes:
And an optical touch screen mounted on the connection portion.
The method of claim 2,
Wherein the guides are formed on the connection portion, and the infrared filter is fixed to the guides.
The method of claim 4,
Wherein the diaphragm is blocked by the infrared filter and infrared rays are incident on the camera module through the infrared filter and the diaphragm.
delete The method according to claim 1,
And an infrared ray emitted from the infrared ray emitting diode is emitted to the upper portion of the flat panel display panel through the passage.
The method according to claim 1,
Wherein the lens is mounted on the passageway.
The method of claim 8,
Wherein the light-shielding protrusion is formed between the diaphragm and the lens.
The method according to claim 1,
The camera module includes:
An infrared light emitting diode for emitting infrared light;
An objective lens for condensing the infrared rays reflected by the recursive reflection plate;
An infrared pass filter for passing a specific wavelength band among the infrared rays condensed by the objective lens;
And a linear sensor for sensing an area where the infrared ray passed through the infrared ray pass filter is touched by incidence.
The method of claim 10,
An optical touch device having an objective lens mounted on the first groove, an infrared pass filter mounted on the second groove, and a printed circuit board on which the image sensor is mounted so as to close the second groove, screen.
delete The method of claim 11,
Wherein the infrared pass filter comprises:
An optical touch screen in which glass is coated with an infrared pass filter material.
The method according to claim 1,
In this case,
Optical touch screen with square ring shape.
15. The method of claim 14,
The bracket
An optical touch screen mounted on an edge of the case.
15. The method of claim 14,
Wherein the bracket having the camera module mounted thereon is fixed to three inner corners of the rectangular ring-shaped case, and a dummy bracket having no camera module mounted on one inner edge of the rectangular ring- This fixed optical touch screen.














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