KR20170085664A - Infrared touch screen panel improving touch sensitivity - Google Patents

Infrared touch screen panel improving touch sensitivity Download PDF

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Publication number
KR20170085664A
KR20170085664A KR1020160005040A KR20160005040A KR20170085664A KR 20170085664 A KR20170085664 A KR 20170085664A KR 1020160005040 A KR1020160005040 A KR 1020160005040A KR 20160005040 A KR20160005040 A KR 20160005040A KR 20170085664 A KR20170085664 A KR 20170085664A
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South Korea
Prior art keywords
light emitting
light
panel
light receiving
width
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Application number
KR1020160005040A
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Korean (ko)
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KR101792805B1 (en
Inventor
임장성
김덕수
기용환
류홍선
홍익준
차지현
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주식회사 에이에프오
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Priority to KR1020160005040A priority Critical patent/KR101792805B1/en
Publication of KR20170085664A publication Critical patent/KR20170085664A/en
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
    • G06F3/0421—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means by interrupting or reflecting a light beam, e.g. optical touch-screen
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/0304—Detection arrangements using opto-electronic means

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Position Input By Displaying (AREA)

Abstract

The present invention relates to a touch screen panel having improved touch sensitivity. A panel which is an area where the object of the present invention can be detected; A light emitting portion including a plurality of light emitting elements arranged along the periphery of the panel, wherein a width of an optical path is increased through a round package process of a lens case of a portion emitting light from the LED chip of the light emitting device; And a light receiving element including a light receiving element provided corresponding to the light emitting element along the panel. According to the infrared touch screen panel having the improved touch sensitivity of the present invention, the width of the optical path is increased through the round package process of the lens case of the light emitting portion of the light emitting device, thereby reducing the width of the dead zone of the infrared touch screen , The plate chip size of the light receiving element is increased to increase the light receiving density to increase the photodegradation degree and to sensitize the change of the light pressure and to provide the accurate coordinate recognition even when touching any area of the panel with the touch object have.

Description

[0001] INFRARED TOUCH SCREEN PANEL IMPROVING TOUCH SENSITIVITY [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a touch screen, and more particularly, to an infrared touch screen panel having an improved touch sensitivity by minimizing a dead zone.

Generally, a touch screen panel refers to an input device capable of recognizing a contact position of a finger or an object when the finger or an object touches the screen, not an input device using a keyboard or a mouse.

The touch panel is an input device that can be easily used by both men and women by organizing the buttons displayed on the display by touching them with their fingers, so that they can be used by banks, government offices, various medical equipment, tourism and major institutions And so on.

Generally, resistive film type, capacitive type, ultrasonic type, and infrared type are typical examples of the conventional methods of implementing a touch screen. In addition, a number of methods such as an image processing method using a camera, a piezo method, and a tension measuring method are being commercialized.

In the resistive film type, two substrates coated with a transparent electrode are bonded together. When an external pressure is applied, the two substrates are in contact with each other and energized to detect a pressure applied position. However, since two electrode substrates are used, there is a disadvantage in that the transmittance is poor.

The electrostatic capacity type is a method in which static electricity generated in a human body is sensed and driven, and thus the function is excellent. However, the contact position is not recognized when the insulating frame is contacted. Also, since it is necessary to use a transparent electrode plate of high quality, it is expensive and difficult to enlarge.

The ultrasonic method uses an ultrasonic wave passing over a touch screen panel. When a touch is made on a screen, some ultrasonic waves are absorbed to detect a signal decrease, thereby detecting a contact position.

In principle, since the infrared ray system does not use a film or the like for touch recognition, it has a transmittance of 100% and does not cause reflection on the screen, decrease in luminance, and blurring of display.

Hereinafter, a conventional infrared touch screen will be described with reference to the accompanying drawings.

1 is a schematic diagram of an infrared touch screen.

1, the infrared touch screen panel 10 includes a panel 12 having a region for sensing a touch position of an object, a light emitting portion 14, a light receiving portion 16, a control portion 22, and a host (not shown) 24).

The panel 12 is formed of a flexible film or glass and is an area for sensing the touch position of the object. The light source unit 14 includes a plurality of light emitting devices 15 and the light receiving unit 16 includes a plurality of light receiving devices 17 and detects light emitted from the light source unit 14. The control unit 22 is connected to the light emitting driver 18 and the light receiving driver 20 and each of the drivers 18 and 20 is connected to the light emitting element 15 and the light receiving element 17 of the light source unit through a switching element . The host 24 receives the signal processed by the control unit 22 and executes the final command.

 If a touch is made to the panel 12 having a matrix configuration of the plurality of light emitting elements 115 and the plurality of light receiving elements 17, the amount of light sensed by the light receiving element 17 is concealed by the touch object. That is, this is a principle in which a position at which a touch contact is generated is detected by using a change in the amount of light incident on the light receiving element 17 in the light emitting element 15 in the ON state.

2 is a view showing the optical path width of the prior art.

The light emitted from the LED chip of the conventional light emitting device 15 has a light emission density of a Gaussian distribution due to the spreading phenomenon. Therefore, the light of the light emitting element 15 is concentrated at the center and has a narrow optical path width 26, and the optical path width 26 becomes 1 mm or less.

3 is a view showing the width of the dead zone of the prior art

When a conventional light emitting device 15 constitutes a light emitting portion, a section in which light is not irradiated due to a narrow optical path width 26 and an arrangement interval by the flange 29 is generated. In this section, touch coordinates are discriminated I can not do it. An area where such touch coordinates can not be identified is called a dead zone. The dead zone width 28 of the conventional infrared touch screen panel is 4.1 mm. If the size of the touch object is smaller than a certain level, the infrared touch screen panel can not detect the touch or can not accurately recognize the touch.

4 is a view showing a light receiving portion of the prior art.

If the size of the plate chip 25 of the light receiving element 17 is small, the degree of photodegradation is remarkably low. When a light receiving element having a low photodegradability is used, a change in light pressure can not be sensed sensitively, and the light receiving density is also remarkably lowered.

FIG. 5 is a result of simulating the optical reception density of the prior art.

5 shows the result of simulating the light receiving density using the light receiving element 17 in which the optical path width 26 is 0.8 mm and the size of the plate chip 25 is 3 mm * 3 mm. As can be seen from the results, it can be seen that the optical reception density is not uniform, and the touch sensitivity of the infrared touch screen panel is deteriorated.

An object of the present invention is to improve the touch sensitivity of an infrared touch screen panel. In particular, it is possible to amplify light emitted from a light emitting device to reduce a dead zone width and increase a plate chip size of a light receiving unit, And an infrared touch screen panel having improved touch sensitivity for sensing touch coordinates.

According to an aspect of the present invention, there is provided a touch screen panel having improved touch sensitivity. A panel which is an area where the object of the present invention can be detected; A light emitting portion including a plurality of light emitting elements arranged along the periphery of the panel, wherein a width of an optical path is increased through a round package process of a lens case of a portion emitting light from the LED chip of the light emitting device; And a light receiving element including a light receiving element provided corresponding to the light emitting element along the panel.

In one embodiment, the spacing of the light emitting elements is reduced by removing the flange of the light emitting element.

In one embodiment, the chip size of the plate of the light receiving element is not less than the optical path width of the light emitting element.

In one embodiment, the optical path width of the light emitting device is 5 mm or more.

In one embodiment, the light emitting elements have a spacing of 1 mm or less.

According to the infrared touch screen panel having the improved touch sensitivity of the present invention, the width of the optical path is increased through the round package process of the lens case of the light emitting portion of the light emitting device, thereby reducing the width of the dead zone of the infrared touch screen , The plate chip size of the light receiving element is increased to increase the light receiving density to increase the photodegradation degree and to sensitize the change of the light pressure and to provide the accurate coordinate recognition even when touching any area of the panel with the touch object have.

1 is a block diagram of a touch screen.
2 is a view showing the optical path width of the prior art.
3 is a view showing the width of the dead zone of the prior art.
4 is a view showing a light receiving portion of the prior art.
FIG. 5 is a result of simulating the optical reception density of the prior art.
6 is a diagram showing a preferred embodiment of the present invention.
Fig. 7 shows the result of simulating the optical reception density of the present invention.
8 and 9 are views showing various embodiments of the configuration of the present invention.

For a better understanding of the present invention, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. The embodiments of the present invention may be modified into various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. The present embodiments are provided to enable those skilled in the art to more fully understand the present invention. Therefore, the shapes and the like of the elements in the drawings can be exaggeratedly expressed to emphasize a clearer description. It should be noted that the same components are denoted by the same reference numerals in the drawings. Detailed descriptions of well-known functions and constructions which may be unnecessarily obscured by the gist of the present invention are omitted.

6 is a diagram showing a first embodiment of the present invention.

Referring to FIG. 6, the light emitting device 102 and the light receiving device 104 constitute a panel 12, which is an area where an object can be detected. The plurality of light emitting devices 102 are arranged along the periphery of the panel 12, and the width of the light path is increased through the round package process of the lens case of the portion that emits light from the LED chip. Therefore, even if the dead zone width 108 is reduced and the size of the object is reduced, the touch coordinates can be accurately recognized, thereby improving the touch sensitivity of the infrared touch screen.

For example, the light emitting device 102 including the configuration of the lens case that has undergone the round package process has a light path width of 10 mm or more, which is equal to or larger than the light path length 26 of the light emitting device 15 used in the prior art 0.8 mm or more. Therefore, the width 108 of the dead zone is reduced and the position of the touch object can be recognized as an accurate coordinate even if the size of the touch object is 1 mm or less. In the conventional light emitting device 15, the divergent angle (directivity angle) of the light source is 55 °, while the divergence angle of the light emitting device 102 of the present invention is maximum 8 ° (directivity angle) It is advantageous in that light can be intensively transmitted to the light-receiving element and efficiently used even in the miniaturization.

The size of the plate chip of the light receiving element 104 is not less than the optical path width of the light emitting element 102. [ Therefore, the light emitting device 102 is configured to be able to receive the light emitted from the light emitting device 102 at the maximum, and is excellent in resolution and sensitively detects a change in the light pressure, thereby improving the touch sensitivity of the infrared touch screen.

For example, the size of the plate chip of the light receiving element is increased from 3 mm * 3 mm to 10 mm * 10 mm, so that the light irradiated from the light source can be accommodated to the maximum, so that the resolution is excellent and the light pressure is detected sensitively.

Fig. 7 shows the result of simulating the optical reception density of the present invention.

Fig. 7 shows the result of simulating the optical reception density using a light receiving element having the optical path width 106 of 5 mm and the size of the plate chip 25 of 10 mm * 10 mm according to the present invention. As can be seen from the results, it can be seen that the optical receiving density is uneven and the touch sensitivity of the infrared touch screen panel is improved.

8 is a diagram showing a second embodiment of the configuration of the present invention.

When the light receiving element 110 having the structure in which the flange 109 is removed from the structure of the light emitting element 102 in which the lens case of the portion that is emitted from the LED chip has undergone the round package process is used, the arrangement interval can be reduced. Thus, even if the optical path width 112 is the same as the optical path width 106 of the light emitting element 102 having the flange, the dead zone width 114 is reduced and the touch coordinates are accurately recognized even if the size of the object is small The touch sensitivity of the infrared touch screen can be improved.

Fig. 9 is a diagram showing a third embodiment of the configuration of the present invention.

9 shows a configuration of a light emitting device 15 and a light receiving device 17 which have been used in the related art and are provided with a light path amplifying device 116 at the front part of the light emitting device 15 and a light converging device 118 ). The amplifying device 116 serves to increase the width of the light path irradiated from the light emitting element 15. [ The amplifying device 116 may be composed of a diffraction device, a light diffusion filter, and a spatial filter of an SRR structure and a CSRR structure. The condensing dock 118 allows the light transmitted through the amplifying device 116 to be intensively sensed by the plate chip 25 of the light receiving element 17.

A light condensing device 118 is provided at the front of the light emitting device 15 and at the front of the light path amplifying device 116 and the light receiving device 17 to increase the width of the optical path to reduce the width of the dead zone. In addition, the density of the light received by the plate chip 25 of the light receiving element 17 can be increased by increasing the width of the widened light path, so that the touch sensitivity of the infrared touch screen panel can be improved.

The light receiving element 104 having the light emitting element 15 and the flange and the plate chip size 105 of the light receiving element is increased and the size 105 of the light emitting element 15 and the plate chip is increased, The touch sensitivity of the infrared touch screen panel can be improved by increasing the size of the plate chip of the light receiving element. The light-emitting element 102 and the light-receiving element 25, in which the lens case of the part to be emitted from the LED chip is packaged in a round package, and the lens case of the part to be emitted from the LED chip are packaged roundly, The width of the dead zone is reduced by enlarging the optical path width of the light receiving element 25 having the light receiving element 102 and the light condensing device 118 so that the touch sensitivity of the infrared touch screen panel can be improved. The light emitting element 110 and the light receiving element 25 without a flange, the light emitting element 110 without a flange and the light receiving element 104 having a flange and improving the plate chip size 105 of the light receiving element, It is possible to reduce the width of the dead zone with a configuration in which the wide light path having the same configuration as that of the light receiving element 25 having the element 110 and the light condensing device 118 and the arrangement interval are narrowed.

The embodiments of the infrared touch screen panel having improved touch sensitivity of the present invention described above are merely illustrative and those skilled in the art will appreciate that various modifications and equivalent embodiments can be made without departing from the scope of the present invention. You can see that it is possible.

Accordingly, it is to be understood that the present invention is not limited to the above-described embodiments. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims. It is also to be understood that the invention includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.

10: Configuration of touch screen Fig. 12: Panel
14: light emitting portion 15: light emitting element
16: light receiving section 17: light receiving element
18: light emitting driver 20: light receiving driver
22: controller 22: host
24: Y-axis driver 26: light path width
28: dead zone width
102: Light emitting device through round package process
104: light receiving element 105: light receiving element chip
106: light path width 108: dead zone width
110: Luminous element with removed flange 112: Light path width
114: dead zone width 116: amplifying device
118: condenser
130: Light receiving element chip size

Claims (5)

A panel that can detect the object;
A light emitting portion including a plurality of light emitting elements arranged along the periphery of the panel, wherein a width of an optical path is increased through a round package process of a lens case of a portion emitting light from the LED chip of the light emitting device;
And a light receiving unit including a light receiving element provided along the panel so as to correspond to the light emitting element. The method according to claim 1,
And the distance between the light emitting devices is narrowed by removing the flange of the light emitting device. The method according to any one of claims 1 to 3,
Wherein the chip size of the plate of the light receiving element is greater than or equal to the optical path width of the light emitting element. The method according to claim 1,
Wherein the optical path width of the light emitting device is 5 mm or more. The method according to any one of claims 1 to 3,
Wherein the light emitting device has an arrangement interval of 1 mm or less.
KR1020160005040A 2016-01-15 2016-01-15 Infrared touch screen panel improving touch sensitivity KR101792805B1 (en)

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KR101792805B1 KR101792805B1 (en) 2017-11-20

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112102738A (en) * 2020-09-15 2020-12-18 深圳市奥拓电子股份有限公司 Interactive COB display module and LED display screen

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004246545A (en) 2003-02-13 2004-09-02 Noritz Corp Operating device
BRPI0918817A2 (en) 2008-08-29 2015-12-01 Sharp Kk coordinate sensor, electronic device, display device, light receiving unit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112102738A (en) * 2020-09-15 2020-12-18 深圳市奥拓电子股份有限公司 Interactive COB display module and LED display screen
CN112102738B (en) * 2020-09-15 2021-08-17 深圳市奥拓电子股份有限公司 Interactive COB display module and LED display screen

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