KR101309623B1 - Touch Sensor Module with Symmetric mirror for Display and Optical Device containing the same - Google Patents

Abstract

The present invention is a touch sensor module for a display including a symmetrical inclined mirror, and the frequency of the emitted light is doubled while maintaining the same number of revolutions of the motor included in the sensor module so that the measurement speed is twice as fast. In addition, by configuring the shape of the symmetrical inclined mirror in the left-right symmetry, it is possible to reduce the vibration problem of the inclined mirror rotating with the motor.

Description

Touch sensor module for display having symmetrical reflection mirror and optical device including the same {Touch Sensor Module with Symmetric mirror for Display and Optical Device containing the same}

The present invention relates to a touch sensor module including a symmetrical inclined mirror and a touch screen optical device using light including the same.

Touch screen is a technology that has been used for a long time in the bank's automation system, etc., and with the spread of smartphones, it is becoming more familiar to the general public. Touch screen technologies used in mobile phones, personal computers, or various displays include resistive films, capacitive and optical technologies, and the advantages and disadvantages of each are as follows.

A resistive touch screen uses a controller and a special coated glass plate on the display surface to create a touch connection. The touch screen panel consists of two thin electrically conducting plates, and the two plates are separated with a narrow gap between them, and when a certain point is pressed on the outer surface of the panel by an input means such as a finger, the two plates are connected and a touch event is applied to the electric current. Causes a perceived change.

The advantage of the resistive method is that it can be accessed using a finger (without gloves), a pen, a stylus or a hard object, but due to the reduced image clarity and the need for periodic recalibration due to the wear of the resistive plate, it is scratched well. It may not be appropriate in public places, and it is easy to be damaged, and there is a disadvantage in that the touch is not recognized when the resistance plate is broken or scratched.

Capacitive touch screens are all made of glass and have higher clarity and durability than resistive film technology. It is a weak point to noise signal by detecting the minute current flowing in accordance with the change of capacitance between sensor electrode and finger, but it is vulnerable to noise signal. It has the advantage of being free to change. Capacitive touchscreens are activated only when touching with a human finger, so there is a dead spot on the screen that scratches the screen coating, which does not recognize gloved fingers, pens, styli or rigid objects, There are disadvantages.

The optical touch screen monitors the movement of all objects adjacent to the screen by sensing the interference of the light source with the light source and optical sensor emitted horizontally on the screen surface. The object is highly accurate, without the need for finger presses, and no special coating or film is required, eliminating scratches, wear, or blur on the display image. The optical system with optical sensors on either side of the screen, or on certain surfaces, is "looking" at objects touching the screen.

Optical touch technology can touch the screen with anything, such as a finger, pen, or credit card, due to its excellent precision, and is perceived even with a quick tap. In addition, optical touch technology is an economical way to add touch functionality to any display, and the same technology is used for large and small screens, regardless of the size of the screen, making it particularly cost-effective for large screens.

The optical system is a technology that can be installed in addition to a desktop PC or an electronic board because it can change an ordinary display to a touch screen economically and easily without hindering the quality and performance of the conventional display.

In the case of an optical device for touch screens installed in addition to an existing display, the data can be collected only when the reflection mirror faces the screen, so that the reflection mirror surface does not face the screen surface, which is about 180 degrees out of 360 degrees. Cannot collect data. That is, compared to a device capable of continuously collecting data during 360-degree rotation, it has a data collection speed of about 1/2, and to compensate for this, increasing the rotation speed of the reflecting mirror makes the noise or heat from the motor relatively Secondary problems such as occurrence will also occur.

The present invention has been made to solve the above problems, to provide a touch sensor module and an optical device including the same that can continuously collect data while the mirror rotates 360 degrees.

The present invention provides a touch sensor module for display, wherein the touch sensor module includes a plurality of optical scanning devices and a driving circuit unit, and the optical scanning device includes: a light source for generating monochromatic light; A light splitter which sends a part of the light emitted from the light source to a collimator lens and sends a part of the light returned through the collimator lens to a detector; A collimator lens configured to advance light emitted from the light splitter to a deflection prism; A deflection prism positioned in line with the light splitter and the collimator lens and changing a direction of parallel light emitted from the collimator lens at a predetermined angle; An optical detector in alignment with the deflection prism, the collimator lens, and the light splitter, the light detector being positioned to face the collimator lens with the light splitter therebetween; The light exiting from the deflection prism is positioned so as to be incident on the both sides of the mirror inclined at the same time by symmetry about the corners and is divided into 1/2 at the same time, and the incident light is divided in the opposite directions in a direction parallel to the plane of the screen and exiting at the same time. A symmetrical inclined mirror having a reflecting surface that reflects at a predetermined angle; A motor to which the symmetrical inclined mirror is attached and rotates the symmetrical inclined mirror together by the rotation thereof; A synchronization detector for detecting rotation synchronization of the motor; And a light sensor positioned on an optical axis in a direction in which the light reflected and emitted from the symmetrical inclined mirror travels, wherein the driving circuit part is connected to the optical scanning device while adjusting the light source, the detector, the motor, and the synchronous detector. Provide a module.

The present invention also provides a touch sensor module for a display, wherein the symmetrical inclined mirror has a triangular prism shape.

The present invention also provides a touch sensor module for a display having a hexahedral shape including both reflective surfaces inclined to be symmetrical about an edge thereof.

The present invention also provides a touch sensor module for a display, wherein the touch sensor module includes two light emitting devices, and the two light emitting devices are located at both sides of the driving circuit unit.

The present invention also provides a touch sensor module for a display, the touch sensor module further including a housing accommodating the same.

The present invention also provides an optical device for display, wherein the touch sensor module is located on one side of the touch screen.

The present invention also provides an optical device for display, wherein the device further comprises one or more reflecting parts, the reflecting parts being located on a side different from the side where the touch sensor module is located.

The present invention also provides an optical device for display, wherein the apparatus further includes a reflecting rod, and the reflecting portion is accommodated in all or part of the reflecting rod.

Due to its structural feature, the display touch sensor module cover of the present invention can increase the sensitivity by twice as much as the light emitted through the symmetrical inclined mirror and then divided into two parts. In addition, it is easier to match the central axis of the motor mirror and the central axis of the motor when manufacturing the optical scanning device than the mirror of the one side biased form, it is possible to reduce the shaking of the motor by the rotation of the motor.

1 is an exemplary view showing an optical device for a display provided with a touch sensor module and a reflecting unit according to an embodiment of the present invention.
2 is an exemplary view showing an optical device for a display provided with a touch sensor module and a reflective rod according to an embodiment of the present invention.
3 is an exemplary view illustrating a configuration and an optical path of a light scanning apparatus included in a touch screen module according to an embodiment of the present invention.
Figure 4 is an exemplary view showing an optical path reflected in the cross-section inclined mirror and the symmetrical inclined mirror of the present invention.

In order to solve the above problems, the inventors reduce the rotational speed of the motor to 1/2, or twice the measurement speed by dividing the light reflected from the symmetrical inclined mirror of the optical scanning device to both sides of the symmetrical inclined mirror It has been found that the present invention can be completed.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention.

In one aspect, the present invention relates to a touch sensor module for a display. According to an aspect of the present invention, there is provided a touch sensor module including a plurality of optical scanning devices and a driving circuit unit, wherein the optical scanning device includes: a light source for generating monochromatic light; A light splitter which sends a part of the light emitted from the light source to a collimator lens and sends a part of the light returned through the collimator lens to a detector; A collimator lens configured to advance light emitted from the light splitter to a deflection prism; A deflection prism positioned in line with the light splitter and the collimator lens and changing a direction of parallel light emitted from the collimator lens at a predetermined angle; An optical detector in alignment with the deflection prism, the collimator lens, and the light splitter, the light detector being positioned to face the collimator lens with the light splitter therebetween; The light emitted from the deflection prism is positioned so as to be incident on both sides of the reflective surface inclined at the same time symmetrically with respect to the corners and is divided into 1/2, and the incident light is simultaneously emitted in a direction parallel to the surface of the screen and the opposite direction. A symmetrical inclined mirror having a triangular prism shaped reflecting surface that reflects at a predetermined angle so as to be reflected; A motor to which the symmetrical inclined mirror is attached and rotates the symmetrical inclined mirror together by the rotation thereof; A synchronization detector for detecting rotation synchronization of the motor; And an optical axis in a direction in which the light reflected and emitted from the symmetrical inclined mirror travels, and the driving circuit part controls the light source, the detector, the motor, and the synchronous detector, and is connected to the optical scanning device.

As shown in Figure 1 (a), the touch sensor module for a display according to an embodiment of the present invention can be installed and used in the display, the display usually includes a multi-sided. In this case, the display touch sensor module of the present application may be located on one side of the display, for example, the screen A, in particular on the top.

The touch sensor module for display according to the present invention includes a plurality of optical scanning devices (21, 22), and is attached to the other side (1b, 1c, 1d) around one side (1a) of the touch screen (A) Receives light reflected through the reflector 30. A display that can be used in the present invention includes, for example, a screen, a TV screen, a computer screen, an electronic board, a beam projector, and the like.

The touch sensor module 20 of the present invention, as shown in Figure 1 (b), includes a driving circuit unit and a plurality of optical scanning devices (21, 22), in particular two optical scanning device. In one embodiment of the invention, the two optical scanning devices (21, 22) are located on both sides of the drive circuit portion (10). The driving circuit unit 10 disposed between the plurality of optical scanning devices 21 and 22 drives the optical scanning device including the motor 225 included in the touch sensor module.

The position of the points (x, y) on the operation of the display A can be determined by the two optical scanning devices (21, 22). The touch sensor module of the present application grasps the angle detected by the first optical scanning device 21 and the second optical scanning device 22 through the central processing unit 12 of the driving circuit unit 10 so that two line segments cross each other. It works on the principle of recognizing a point as (x, y). That is, when a user touches a specific portion of the touch screen A with a finger or the like, a difference in reflected light generated by the finger or the like is detected by the photodetector so that the light energy is converted into electrical energy to the driving circuit unit 10. Transfer is performed to perform the operation, it is possible to perform accurate coordinate calculation through the central processing unit 12. Such a touch sensor module can be used in various fields such as a TV screen of various sizes, a computer screen, an electronic board, and a beam projector.

In one embodiment of the present invention, an infrared or visible light laser is used as the light, and a laser diode (LD) or an LED is used as the light source.

As shown in FIG. 3, each of the optical scanning devices included in the touch sensor module according to the present application includes a light splitter 220 disposed along a scanning direction of the light source 210 and the light source 210 for emitting light, The collimator lens 230, the deflection prism 240, the tilt mirror 250, the photodetector 270, the motor 225, and the rotating synchronous detector 260 are included. In one embodiment of the invention the motor is a spindle motor. The optical scanning device for display includes the above-described configuration and is capable of performing a function of a light emitting unit and a light receiving unit for incident light. In one embodiment of the present invention, an infrared or visible light laser is used as the light, and a laser diode (LD) or an LED is used as the light source. In one embodiment of the present invention, a laser is used as the light source, and the diameter of the light passing through the collimating lens is about 2 mm or more.

Although not shown, a light amount adjusting unit for adjusting the amount of light emitted from the light source 210 may be provided at a rear end of the light source 210. The light amount adjusting unit may adjust the amplitude, or intensity, of the light within a predetermined range according to the amount of light that the touch screen A can accommodate. In addition, an optical attenuator for reducing the amount of light emitted or an optical density filter for filtering the light density to a desired amount is used as the light amount adjusting unit.

In one embodiment of the present invention, the light splitter 220 is installed on one side of the light source 210, and sends a part of the light incident from the light source toward the lens 230, which is a different direction from the incident direction, A portion of the light returned from the reflector 30 or the reflector 31 is transmitted to the detector 270.

The collimator lens 230 allows divergent light incident from the light splitter 220 to travel in parallel without spreading in all directions.

The deflection prism 240 is a device for changing the direction of the light emitted from the light source 210, and is located in line with the light splitter 220 and the collimator lens 230.

In one embodiment of the present invention, the light emitted from the lens 230 is turned at a predetermined angle by the deflection prism 240 to be directed toward the symmetrical inclined mirror 250.

In one embodiment of the invention, the deflection prism changes the direction of light by 90 °. In the deflection prism 240, a symmetrical inclined mirror 250 for reflecting light whose direction of travel has been changed is positioned in contact with the motor 225. The motor rotates the symmetrical mirror, and in one embodiment of the invention the motor is a spindle motor.

In Fig. 4, the structure and light path of the conventional inclined mirror 4a and the symmetric inclined mirror 4b of the present invention are exemplarily shown. In one embodiment of the present invention, the symmetrical inclined mirror 250 has a triangular pillar shape but is not limited thereto. The inclined mirror is positioned on the motor such that the light exiting from the deflection prism 240 is incident on both inclined surfaces about the corner, and the edge of the symmetrical mirror surface faces the incident light. The two inclined surfaces are formed to be inclined at a predetermined angle to the exit surface of the incident light so as to divide the incident light by 1/2 and reflect them back in both directions. In one embodiment of the present invention, the predetermined angle of the inclined surface with respect to the exit surface of the incident light is 45 °, the symmetrical inclined mirror changes the direction of the light 90 °. In one embodiment of the present invention, when the light reflected from one surface of the symmetrical inclination mirror 250 is directed to the rotary synchronization detector 260, the light reflected from another surface of the symmetrical inclination mirror is directed toward the screen. Since the light reflected by the mirror from the optical scanning device is divided into two branches, the frequency of the light emitted onto the screen and the rotating synchronous detector is increased twice as much as that of the mirror having a single-sided mirror. You will have twice the measurement speed. Therefore, in the case of using the symmetrical reflection mirror, even if the rotational speed of the motor is reduced to 1/2 compared with the case of using the reflection mirror of the cross-sectional method will have the same measurement speed. This can reduce problems such as vibration and heat that can occur in the motor.

In case of using symmetrical inclined mirror, the mirror is symmetrical, so it is easier to match the center of gravity of the inclined mirror to the center of the motor than the asymmetric mirror which is a sectional inclined mirror. Problems such as vibration can be reduced.

In one embodiment of the invention, the light passing through the screen contacts the reflector 30 or the screen attached to one side 1a where the touch sensor module 20 is located and the other side 11b, 11c, 11d. The reflection rod 31 is reached through the deflection prism 240 and the lens 230 through the transmission protective film and the inclined mirror 250 by reflection, and a part thereof passes through the light splitter 220. The light detector 270, which is in line with the deflection prism 240, the lens 230, and the light splitter 220 and faces the lens with the light splitter therebetween, reaches the photodetector 270.

The photodetector 270 is a device for converting the light energy of the laser into electrical energy and detecting it. In addition, the optical scanning devices (21, 22) is provided with a rotating synchronous detector 260 on one side of the spindle motor 225, to detect the synchronization of the rotation of the spindle motor 225, respectively. The rotational synchronization of the spindle motor 225 serves as a reference for signal detection.

In one embodiment of the present invention, the driving circuit unit 10 is installed on one side of the optical scanning device 21, 22 as shown in Figure 1 (b), the light source 210, the detector 270 The driving of the spindle motor 225 and the rotary synchronous detector 260 is controlled. Specifically, the driving circuit unit 10, the control unit for controlling the driving of the detector 270 and the rotary synchronous detector 260, the motor driving control unit (13a, 13b) and the light source control unit (14a, 14b) Can be installed. In addition, the driving circuit unit 10 may precisely control the motor 225 through the motor driving control units 13a and 13b. In addition, the driving circuit unit 10 further includes a central processing unit 12 capable of decomposing an image displayed on the touch screen A to determine a maximum sharpness within a range of a predetermined resolution. Can be judged in the range.

In one aspect, the present invention relates to an optical device for display including the touch sensor module for display. As shown in FIG. 1, the optical device further includes a reflector 30. When the optical device is used for a display A, for example, a screen, the touch sensor module is located at one side. The reflector is located on the other side (1b, 1c, 1d) around one side (1a) of the screen (A), is emitted from the optical scanning device (21, 22) included in the touch sensor module reflector 30 Reflects the light incident on the) and sends it to the touch sensor module 20.

The reflector may be a known one capable of reflecting light, but a material having a high reflectance is particularly preferable. In one embodiment of the present invention, the reflector includes a reflective film and a reflective tape, but is not limited thereto. In the present application, one or more reflective parts such as a reflective film and a reflective tape may be used. For example, if the reflective tape covers all of the other sides (1b, 1c, 1d) in one sheet, one is included, but if a separate reflective tape is used for each side, the number of sides provided with the reflective tape Depending on the number of reflective tape can be used, all of which are included in the scope of the present application.

In another aspect of the present invention, instead of the reflecting portion covering the other side, a reflecting rod having a part or all of a reflecting film or a reflecting tape having a light reflecting function may be used. As shown in FIG. 2, the optical device for a display using a reflective rod with a reflective film according to another embodiment of the present invention does not have a reflector installed on three surfaces other than the surface on which the touch sensor module is mounted. Instead, a reflective film or the like is separately accommodated at the end of the reflective rod 31 (for example, a pen or rod) directly contacting the touch screen, so that the laser light emitted when the touch screen A is touched is reflected on the reflective rod 31. After reaching the reflecting film etc. which were installed in ()), it has a structure which returns to the reverse order of the direction which reflexively reflected and exited, and reaches the detector 270. In the case of using a reflecting rod, light reflection occurs only on the reflecting rod, and the reflected light is detected by a photodetector to convert light energy into electrical energy.

A: touch screen 10: driving circuit unit
20: touch sensor module 21, 22: optical scanning device
30: reflection part 31: reflection rod
210: light source 220: light splitter
225: spindle motor 230: collimator
240: deflection prism 250: tilting mirror
260: rotary synchronous detector 270: detector

Claims (7)

Touch sensor module for display,
The touch sensor module includes a plurality of optical scanning devices and a driving circuit unit,
The optical scanning device includes: a light source for generating monochromatic light; A light splitter which sends a part of the light emitted from the light source to a collimator lens and sends a part of the light returned through the collimator lens to a detector; A collimator lens configured to advance light emitted from the light splitter to a deflection prism; A deflection prism positioned in line with the light splitter and the collimator lens and changing a direction of parallel light emitted from the collimator lens at a predetermined angle; An optical detector in alignment with the deflection prism, the collimator lens, and the light splitter, the light detector being positioned to face the collimator lens with the light splitter therebetween; The light exiting from the deflection prism is positioned so as to be incident on the both sides of the mirror inclined at the same time by symmetry about the corners and is divided into 1/2 at the same time, and the incident light is divided in the opposite directions in the direction parallel to the plane of the screen and exiting the light simultaneously. A symmetrical inclined mirror having a reflecting surface that reflects at a predetermined angle; A motor to which the symmetrical inclined mirror is attached and rotates the symmetrical inclined mirror together by the rotation thereof; And a synchronization detector for detecting rotational synchronization of the motor,
The driving circuit unit controls the light source, the detector, the motor and the synchronous detector and is connected to the optical scanning device, a display touch sensor module. The method of claim 1,
The symmetrical inclined mirror has a triangular prism shape, touch sensor module for display. The method of claim 1,
The touch sensor module includes two photorejuvenation devices, and the two optical devices are located at both sides of the driving circuit unit. The method of claim 1,
The touch sensor module further comprises a housing for housing the touch sensor module. An optical device for a display comprising the touch sensor module according to any one of claims 1 to 4, wherein the touch sensor module is located on one side of the screen. The method of claim 5,
The optical device for display further includes at least one reflector, wherein the reflector is located on a side different from the side where the touch sensor module is located. The optical device for display as claimed in claim 5, wherein the optical device for display further includes a reflecting rod, and the reflecting portion is accommodated in all or part of the reflecting rod.

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