KR20120098554A - Optical touch screen and method for assembling the same - Google Patents

Abstract

PURPOSE: An optical touch screen and assembling method thereof are provided to reduce manufacture costs by enabling a user to exclude high-priced and reinforced glass from a camera module and a retro-reflection board. CONSTITUTION: A case(300) includes a flat display panel. Brackets(271a-271c) are installed at the boundary of the case. Camera modules(161a-161c) are installed on the brackets. A retro-reflection board(170) is installed according to the inside wall of the case. A frame(171) is installed between the bracket and the inside wall of the case. The retro-reflection board is installed on the frame. The case is a rectangular ring shape.

Description

Optical touch screen and assembly method thereof {Optical touch screen and method for assembling the same}

The present invention relates to an optical touch screen and a method of assembly thereof.

Touch screens include resistive, capacitive, optical, ultrasonic, electromagnetic, and vector force methods, each of which has advantages and disadvantages.

In brief, the resistive method is a method in which a transparent conductive film between two substrates is in contact with each other and is the most easily implemented and excellent in performance among the touch screen methods to date, but has a disadvantage of inferior mechanical and environmental reliability. have.

Similar to the optical sensor method, the ultrasonic method has a disadvantage in that it is vulnerable to noise or noise of a factory by determining a position when the acoustic path between the sound wave generating element and the sound wave recognition element is blocked.

The electromagnetic method is a method using the principle of magnetism and electromotive force generation of Faraday's law, and calculates coordinates by determining the amount of current flowing through the coil for each position. Since a signal of alternating current must be applied to the coil, a special dedicated pen is needed.

The capacitive method is a method that detects the minute current flowing according to the capacitance change between the sensor electrode and the finger and determines the position. However, the capacitive method is weak in the noise signal, but it is strong in environmental reliability and changes the upper barrier layer. Therefore, there is an advantage that the mechanical reliability can be changed freely.

Since the optical method does not use a film for touch recognition in principle, the transmittance is 100%. In addition, the reflection and the decrease in the luminance, the blurring of the display, etc., which occur when the touch panel of another type is attached do not occur.

The maintenance of transmittance and brightness in a display is an important factor of quality, which is suitable for such high quality display configurations.

In addition, since the optical touch panel is a method of detecting the coordinates of the light blocking method, the optical touch panel is not detected by physical contact or electrical contact, so that the sensor is not loaded. Accordingly, it is highly reliable and is used for factory monitoring, various automation devices, financial terminals, and the like, and does not use materials such as film or ITO protective film, so that durability of wounds or external shocks is large, and thus there is a low possibility of error such as malfunction.

The present invention is to solve the problem that can easily perform the assembly of the optical touch screen.

The present invention,

A flat panel display panel;

A case to which the flat panel display panel is mounted and assembled;

Brackets assembled at an edge of the case;

A camera module mounted to the brackets;

An optical touch screen is provided that includes a retroreflective plate disposed along an inner surface of the case.

In addition, a frame mounted on the inner surface of the case between the brackets is further included, the retroreflective plate is mounted to the frame.

The case has a rectangular ring shape.

In addition, the brackets and the first and second fixing parts fixed to the case; And a connection part connected to the first and second fixing parts, and the camera modules are mounted to the connection part of the bracket.

In addition, the connection portion of the bracket and the first passage through which the infrared light emitted from the camera module can pass; And a second passage through which infrared light incident on the camera module passes.

In addition, the retroreflective plate is mounted to the first and second fixing parts.

A groove is formed in the frame, and a projection for inserting the groove is formed in the retro-reflective plate, and a protrusion formed in the retro-reflective plate is inserted into the groove formed in the frame, so that the retro-reflective plate is formed in the frame. It is mounted on.

The camera module may include an infrared light emitting diode emitting infrared light; An infrared pass filter for passing only infrared rays reflected by the retroreflective plate; And a linear sensor configured to sense a region where the infrared light passed through the infrared light passing filter is touched by incident light.

The present invention,

Preparing a bracket and a case to which the camera module is mounted;

Fixing the bracket to an edge of the case;

Fixing a retroreflective plate to the case;

A method of assembling an optical touch screen is provided that includes mounting a flat panel display panel to the case.

The bracket may include first and second fixing parts fixed to the case; And a connection part connected to the first and second fixing parts, and the camera modules are mounted to the connection part of the bracket.

In addition, a first fastening protrusion is formed on the camera module, second and third fastening protrusions are formed on the first and second fixing parts of the bracket, and the first to third fastening protrusions are formed on the case. Corresponding first to third fastening holes are formed, and the first to third fastening protrusions are inserted into the first to third fastening holes to mount the camera module and the bracket to the case.

In addition, fixing the bracket to the corner of the case, fixing the brackets on which the camera module is mounted on the three inner corners of the square ring-shaped case, the one inner corner of the square ring-shaped case Fix the dummy bracket without camera module.

According to the present invention, the camera module can be easily mounted through the bracket to the case, the retroreflective plate can be simply assembled to the frame mounted on the case, and each of the component elements is mechanical for the normal operation of the optical touch screen. The effect is that the sorting can be done easily.

In addition, the present invention does not need to mount the camera module and the retroreflective plate to the expensive reinforced glass, there is an effect that can reduce the manufacturing cost.

In addition, the present invention has an effect that can be easily fastened to the frame and the bracket by forming a groove in the frame and the bracket, and forming a protrusion on the retroreflective plate, the fastening of the retroreflective plate.

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 the coordinates of a specific area touched in the optical touch screen according to the present invention
3A and 3B are schematic conceptual views illustrating a linear sensor of an optical touch screen according to the present invention.
Figure 4 is a schematic perspective view for explaining the fastening state of the optical touch screen 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 partial perspective view for explaining in detail the method of assembling the optical touch screen according to the present invention;
8A and 8B are schematic partial perspective views illustrating in detail the process of attaching the retroreflective plate in the 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 for explaining 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 light emitting diode 100 emitting infrared light; An infrared pass filter (130) for passing only infrared rays reflected by the retroreflective plate (170); It includes a linear sensor 150 for detecting the area touched by the incident infrared light passed through the infrared filter 130.

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

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

Therefore, the infrared light emitting diode 100 of the camera module 160 emits infrared light, and the emitted infrared light travels along the flat panel display panel 200 and is reflected by the retroreflective plate 170 so that the camera module Incident to the infrared ray pass filter 130.

The infrared ray passing filter 130 passes only infrared rays reflected by the retroreflective plate 170, and the infrared rays passing through the infrared ray passing filter 130 are incident to the linear sensor 150.

In this case, when the user touches a specific area of the flat panel display panel 200 with the finger of the hand 250, the infrared ray is blocked in the touched area. As a result, a black spot is formed on the linear sensor 150 to detect coordinates of the touched specific area.

In addition, a flat panel display panel is positioned below the infrared light emitting diode 100 and the retroreflective plate 170. When the user touches a specific area of an image displayed on the flat panel display panel, the linear sensor 150 is disposed. A driving signal corresponding to the coordinates detected at) is generated to perform various functions including screen change, volume control, screen movement, screen enlargement and reduction.

The flat panel display panel may be applied to 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), and an electronic paper display panel. have.

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

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

For example, as shown in FIG. 2, when the first and second camera modules 161a and 161b are installed in the two corner regions 211 and 212 of the flat panel display panel 200, the flat panel display panel 200 is provided. When the predetermined region 250 is touched, infrared rays are blocked from the touched predetermined region 250, and black spots are formed on the linear sensors of each of the first and second camera modules 161a and 161b.

Therefore, the linear sensor can detect the coordinates of the touched specific region as 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 the first to nth sensing pixels 151, 152, 153, 154 and 155 as shown in FIGS. 3A and 3B.

In this case, when a predetermined area of the flat panel display panel 200 is touched, a black spot is formed on one sensing pixel of the first to n sensing pixels 151, 152, 153, 154, and 155.

Further, 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 linear of the first camera module 161a to which the black spot is formed. The sensing pixels of the sensor 150a and the sensing pixels of the linear sensor 150b of the second camera module 161b are likely to have different positions.

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

Meanwhile, as shown in FIG. 2, when the horizontal direction of the flat panel display panel 200 is defined in the x direction and the vertical direction is defined in the y direction, the first camera module 161a of the touched area 250 is defined. The linear sensor of the second camera module 161b at the first angle θ1 formed by the connecting line S1 to the linear sensor 150a and the horizontal direction of the flat panel display panel 200, and at the touched area 250. When the second angle θ2 formed by the connecting line S2 and the horizontal direction of the flat panel display panel 200 and the length of the horizontal direction of the flat panel display panel 200 are known up to 150b), Coordinates can be extracted.

The first angle θ1 and the second angle θ2 are changed according to the position of the touched area 250, and corresponding to the first to n sensing pixels of the linear sensors 150a and 150b. 151,152,153,154,155 are subdivided.

That is, each of the first to n sensing pixels 151, 152, 153, 154 and 155 of the linear sensors 150a and 150b corresponds to the changed first angle θ1 and the second angle θ2.

Therefore, when a black spot is formed at one sensing pixel of the first to n 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 first angle ( Since θ1 and the second angle θ2 are known, the coordinates (x, y) of the touched area 250 can be extracted.

In addition, when a predetermined area 250 of the flat panel display panel 200 is touched, the coordinate extraction operation unit may extract the coordinates (x, y) of the touched area 250 in real time by using the above-described method or another method. It may be included in the touch system.

Figure 4 is a schematic perspective view for explaining the fastening state of the optical touch screen according to the present invention, Figure 5 is a plan view schematically showing a case of the optical touch screen according to the present invention.

In the optical touch screen according to the present invention, the flat panel display panel 200 is mounted and assembled to a case 300.

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

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

In this case, the camera modules 161a, 161b, and 161c are mounted to the brackets 271, 272, and 273, and the brackets 271, 272 and 273 are mounted to the three rectangular ring edges of the case 300.

In addition, a dummy bracket 280 in which the camera module is not mounted is mounted on the remaining one corner of the square ring.

That is, the optical touch screen includes a flat panel display panel 200; A case 300 in which the flat panel display panel 200 is mounted and assembled, and having a rectangular ring shape; Brackets assembled at an edge of the case 300; It comprises a camera module (161a, 161b, 161c) mounted on the brackets.

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

In addition, a retroreflective plate 170 is mounted on the inner surface of the case 300 between the brackets.

In addition, the retroreflective plate 170 is mounted on the dummy bracket 280.

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

In the method of assembling the optical touch screen according to the present invention, first, as shown in FIG. 6A, a case 300 having a rectangular ring shape is prepared.

Next, the brackets 271, 272, and 273 on which the camera modules 161a, 161b, and 161c are mounted are fixed to three inner edges of the case 300 having a rectangular ring shape, and the case 300 having the rectangular ring shape is fixed. Fix the dummy bracket 280 not equipped with the camera module at one inner edge (FIG. 6B).

The brackets 271, 272, and 273 on which the camera modules 161a, 161b, and 161c are mounted have an opening through which infrared rays are emitted from the camera modules 161a, 161b, and 161c, and infrared rays reflected from the retroreflective plate may be incident. The dummy bracket 280 does not need the opening.

Subsequently, 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 and 161c are mounted, and the dummy bracket 280 on which the camera module is not mounted.

Then, the retroreflective plate is fixed to the frame 171 and the dummy bracket 280. (FIG. 6D)

The retroreflective plate may be fixed to the brackets 271, 272, and 273 on which the camera modules 161a, 161b, and 161c are mounted, without blocking the opening.

After performing the assembly process of FIG. 6D, a flat panel display panel is mounted on the case 300.

Thus, the optical touch screen of the present invention comprises a flat panel display panel; A case 300 in which the flat panel display panel is mounted and assembled, and having a rectangular ring shape; Brackets 271, 272, 273 and 280 assembled to corners of the case 300; A frame 171 mounted on an inner surface of the case between the brackets 271, 272, 273 and 280; Camera modules (161a, 161b, 161c) mounted on the brackets; It is configured to include a retroreflective plate mounted on the frame 171.

7 is a schematic partial perspective view for explaining in detail the method of assembling the optical touch screen according to the present invention.

The bracket 271 in which the camera module 161a is mounted includes first and second fixing parts 271a and 271c fixed to the case 300; The connection part 271b connected to the first and second fixing parts 271a and 271c is configured.

In the method of assembling the optical touch screen according to the present invention, first, the camera module 161a is mounted to the connection part 271b of the bracket 271.

Here, the connection portion 271b of the bracket 271 may include a first passage 273a through which infrared light emitted from the camera module 161a may pass; A second passage 273b through which infrared rays incident to the camera module 161a may pass may be provided.

As illustrated in FIG. 7, the first and second passages 273a and 273b may also be implemented as openings formed in the connection portion 271b of the bracket 271, but are not limited thereto.

Thereafter, the bracket 271 on which the camera module 161a is mounted is mounted at an edge of the case 300.

In more detail, as shown in FIG. 7, a first fastening protrusion 161a1 is formed in the camera module 161a, and the first and second fixing parts 271a and 271c of the bracket 271 are formed in the camera module 161a. Second and third fastening protrusions 275a and 275b are formed.

In addition, first and third fastening holes 321a, 321b, and 321c corresponding to the first to third fastening protrusions 161a1, 275a, and 275b are formed in the case 300.

Therefore, the first to third fastening protrusions 161a1, 275a and 275b are inserted into the first to third fastening holes 321a, 321b and 321c so that the camera module 161a and the bracket 271 are It is mounted to the case 300.

Next, the frame 171 is mounted on the case 300, and the retroreflective plate 170 is mounted on the frame 171.

In this case, the retroreflective plate 170 may be mounted on the first and second fixing portions 271a and 271c of the bracket 271.

Therefore, the present invention has an advantage that the camera module can be easily mounted through the bracket to the case, the assembly of the retroreflective plate can be easily assembled to the frame mounted to the case, and the alignment of the respective component elements can be easily performed.

In addition, the present invention does not need to mount the camera module and the retroreflective plate to the expensive reinforced glass, there is an advantage that can reduce the manufacturing cost.

8A and 8B are schematic partial perspective views illustrating in detail the process of attaching the retroreflective plate in the method of assembling the optical touch screen according to the present invention.

8A, after the bracket 271 and the frame 171 on which the camera module 161a is mounted are mounted on the case 300, as shown in FIG. 8B, a part of the frame 171 and the bracket 271 are illustrated. The retroreflective plate 170 is mounted in the area.

In this case, only the connection part 271b of the bracket 271 is exposed, and is surrounded by the retroreflective plate 170 on the inner surface of the case 300 to reflect infrared rays.

Here, the infrared rays emitted from the camera module 161a are emitted to the first passage 273a of the connection portion 271b of the bracket 271, and the emitted infrared rays are reflected from the retroreflective plate 170 to the second. It enters the passage 273b.

Therefore, the infrared rays emitted from the camera module 161a and the incident infrared rays do not interfere with both.

Meanwhile, grooves may be formed in some regions of the frame 171 and the bracket 271, and protrusions may be formed in the retroreflective plate 170 to be inserted into the grooves 171a.

Therefore, according to the present invention, the frame 171 is formed in such a manner that the retroreflective plate 170 is fastened by a groove formed by the groove formed in the frame 171 and the bracket 271 and the protrusion formed in the retroreflective plate 170. And it can be easily fastened to the bracket 271 has the advantage.

Alternatively, when guides are formed in each of the upper and lower portions of the frame 171 and the bracket 271, a region between the guides is formed to be concave, so that the retroreflective plate 170 is recessed between the guides. You can also apply it by embedding it in an area.

That is, the retroreflective plate 170 may be fastened to the frame 171 and the bracket 271 in a manner in which a chock is fastened, and thus may be implemented in various ways.

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 (12)

A flat panel display panel;
A case to which the flat panel display panel is mounted and assembled;
Brackets assembled at an edge of the case;
A camera module mounted to the brackets;
And a retroreflective plate disposed along an inner side surface of the case.
The method according to claim 1,
Further comprising a frame mounted on the inner surface of the case between the brackets,
The retroreflective plate,
An optical touch screen mounted to the frame.
The method according to claim 1,
In this case,
Optical touch screen in the form of a square ring.
The method according to claim 1,
The brackets,
First and second fixing parts fixed to the case;
A connection part connected to the first and second fixing parts,
The camera modules,
Optical touch screen mounted to the connection portion of the bracket.
The method of claim 4,
The connecting portion of the bracket,
A first passage through which infrared light emitted from the camera module can pass;
And a second passage through which infrared light incident on the camera module passes.
The method of claim 4,
The retroreflective plate,
An optical touch screen mounted to the first and second fixtures.
The method according to claim 1,
The frame is formed with a groove, and the reflex reflector is provided with a protrusion that can be inserted into the groove,
The projection formed in the retroreflective plate is inserted into the groove formed in the frame, so that the retroreflective plate is mounted on the frame.
The method according to claim 1,
The camera module,
An infrared light emitting diode emitting infrared light;
An infrared pass filter for passing only infrared rays reflected by the retroreflective plate;
And a linear sensor configured to sense a region where the infrared light passed by the infrared light passing filter is touched by incident light.
Preparing a bracket and a case to which the camera module is mounted;
Fixing the bracket to an edge of the case;
Fixing a retroreflective plate to the case;
Mounting a flat panel display panel to the case.
The method according to claim 9,
The bracket,
First and second fixing parts fixed to the case;
A connection part connected to the first and second fixing parts,
The camera modules,
Assembly method of the optical touch screen mounted on the connection portion of the bracket.
The method of claim 10,
A first fastening protrusion is formed on the camera module, and second and third fastening protrusions are formed on the first and second fixing parts of the bracket.
The case is formed with first to third fastening holes corresponding to the first to third fastening protrusions,
And mounting the camera module and the bracket to the case by inserting the first to third fastening protrusions into the first to third fastening holes. The method according to claim 9,
Fixing the bracket to the corner of the case,
Fixing brackets on which the camera module is mounted on three inner edges of the rectangular ring shaped case, and fixing dummy brackets on which the camera module is not mounted on one inner edge of the rectangular ring shaped case Assembly method of the optical touch screen.

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