WO2011079670A1

WO2011079670A1 - Touch screen and touch system

Info

Publication number: WO2011079670A1
Application number: PCT/CN2010/079136
Authority: WO
Inventors: 叶新林; 刘建军; 刘新斌
Original assignee: 北京汇冠新技术股份有限公司
Priority date: 2009-12-28
Filing date: 2010-11-25
Publication date: 2011-07-07

Abstract

A touch screen and a touch system including the touch screen are disclosed. The touch screen includes a substrate and a light source. The substrate has a top surface and a bottom surface. Beam emitted from the light source propagates by frustrated total internal reflection between the top surface and the bottom surface. The touch screen also includes a control unit and at least two optical sensors. Each optical sensor is located below the bottom surface for obtaining scatter data brought by touching the top surface and breaking the frustrated total internal reflection. Each optical sensor is coupled to the control unit. Using the scatter data obtained by the optical sensors, the touch position on the top surface is located by the control unit. The touch position can be sensed accurately by using introduced optical sensors which mark position of each point.

Description

Touch screen and touch system

The present invention relates to a touch screen, and more particularly to an infrared touch screen and a touch system including the touch screen. Background technique

The touch screen has been widely used as the most compact and mature computer multimedia human-computer interaction device. Among various touch screen technologies, infrared touch screens are used in many fields due to their advantages in process bills and low production costs.

As shown in Fig. 1, the conventional infrared touch screen is mounted in a frame suitable for being mounted on the edge of the display, and a plurality of pairs of infrared transmitting tubes (such as A..., A are installed in a certain order along the four edges of the display surface of the display. _m , and B ..., B _n ) and receiving tubes (such as d, ..., C _m , and D ..., D _n ). Conventionally, a corresponding pair of launch tubes and receiving tubes (such as A _m and C _m ) are referred to as transmitting and receiving pairs. The transmitting and receiving pairs are arranged in the direction of the edge of the display surface to form a mutually perpendicular transmitting and receiving array; wherein each pair of transmitting and receiving pairs are mounted on one axis, and the formed axes form a grid on the display surface. structure. When the corresponding infrared transmitting tube and receiving tube are controlled to operate in sequence, a dynamic infrared grid is formed on the display surface of the display. When no touch occurs, each infrared light is smooth; when a touch occurs, the touch blocks the horizontal and vertical infrared rays at the corresponding position. The position of the touch can be determined by the control unit according to the smoothness or blocking of the infrared rays. Although the current infrared touch screen achieves the reliability of touch detection to meet practical needs, it is still desirable to provide an alternative touch detection method to increase flexibility.

Further, various new technologies including video game systems, computers, and devices including electronic music require the application of multi-touch screen technology, which can simultaneously detect multiple touch points on one touch screen. In theory, multi-touch detection can also be achieved by applying the current infrared touch screen. However, in practical applications, it has been found that multiple touch points cannot be effectively distinguished by the current infrared touch screen. Therefore, there is a need for a touch screen that can accurately sense multi-touch. Summary of the invention

In view of the above problems, the present invention provides a touch screen and a touch system that can solve at least one of the deficiencies in the prior art.

The invention provides a touch screen, comprising: a substrate and a light source; the substrate has a top surface and a bottom surface, and the light emitted by the light source undergoes frustrated total internal reflection between the top surface and the bottom surface, and further includes control a unit and at least two optical sensing devices, each of said optical sensing devices being provided with total internal reflection induced scattering data; each of said optical sensing devices being coupled to said control unit, said control unit utilizing said optical The scatter data acquired by the sensing device determines a touch location on the top surface.

Optionally, a reflective device is attached to an edge of the substrate away from the light source.

Optionally, the touch screen further includes an auxiliary substrate, the auxiliary substrate is located under the bottom surface, and each of the optical sensing devices is attached to the auxiliary substrate and faces the bottom surface; or, at the bottom A light transmissive film layer is attached to the surface, and each of the optical sensing devices is attached to the light transmissive film layer.

Optionally, the at least two optical sensing devices are arranged in a first matrix or grid.

Optionally, the light source uses at least one light emitting diode or a cold cathode fluorescent lamp as the light emitting element; each of the light emitting elements is arranged separately and placed at a corner of the substrate.

Optionally, the light source uses at least one light emitting diode or a cold cathode fluorescent lamp as the light emitting element; each of the light emitting elements is continuously arranged and disposed on a side of the substrate.

Optionally, the light source is an infrared tubular light source, and the infrared tubular light source is disposed on a side of the substrate.

Optionally, the light source uses a light emitting diode or an electroluminescent device as the light emitting element; each of the light emitting elements is arranged in a second matrix, and each of the light emitting elements is disposed between the optical sensing devices.

Optionally, each of the optical sensing devices has a continuous structure that changes in a regular manner, and each of the optical sensing devices is arranged in a discrete, parallel arrangement and intersects with a direction of light emitted by the light source.

Optionally, the light source uses at least one light emitting diode or a cold cathode fluorescent lamp as the light emitting element; each of the light emitting elements is continuously arranged and disposed on a side of the substrate. Optionally, the light source uses a light emitting diode or an electroluminescent device as a light emitting element; each of the light emitting elements is arranged in a second matrix, and the optical sensing device is spaced between rows or columns of the second matrix.

Optionally, the light emitted by each of the light emitting elements is parallel.

Optionally, each of the optical sensing devices is perpendicular to a direction of light emitted by each of the light emitting elements.

The invention provides a touch system, and the touch system comprises the above touch screen.

Compared with the prior art, the touch screen provided by the invention has the following advantages:

The touch screen provided by the embodiment of the present invention, by introducing at least two optical sensing devices into the touch screen, and marking the positions of the points on the touch screen by using the optical sensing devices, and further utilizing the optical sensing device coupled to the optical sensing device a control unit that knows the scatter data of the position of the optical sensing device that senses the touch, thereby accurately sensing the touch position;

The touch screen provided by the embodiment of the present invention attaches each of the optical sensing devices to the auxiliary substrate, or attaches a light transmissive film layer to the bottom surface, and then attaches each of the optical sensing devices. On the light transmissive film layer, the condition that the light emitted by the light source is subjected to frustrated total internal reflection in the substrate can be protected, and the touch position is accurately sensed;

According to the touch screen provided by the embodiment of the present invention, by arranging at least two of the optical sensing devices into a first matrix or a grid, the positions of the points on the touch screen can be uniformly marked to facilitate accurate sensing of the touch position;

The touch screen provided by the embodiment of the present invention has a continuous structure with regular changes, and each of the optical sensing devices is separated, parallel, and the direction of the light emitted by the light source. Crossing, the direction of the light and the continuous direction of the optical sensing device intersecting therewith can be used as coordinates to mark the position of each point on the same optical sensing device, thereby marking the position of each point on the touch screen, which is beneficial for accurate sensing. Touch location

The touch system provided by the embodiment of the present invention introduces at least two optical sensing devices into the touch screen included in the touch system, and marks the positions of the points on the touch screen by using the optical sensing devices, thereby utilizing the coupling At the control unit of the optical sensing device, the scatter data of the position of the optical sensing device that is touched is known, whereby the touch position can be accurately sensed. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing a structure in which a multi-point cannot be effectively distinguished by using an infrared touch screen in the prior art; FIG. 2 is a plan view showing a structure according to a first embodiment of the present invention;

Figure 3 is a cross-sectional view showing the structure of the first embodiment of the present invention;

4 is a schematic plan view showing an optical path in a substrate in an embodiment of the present invention;

Figure 5 is a cross-sectional view showing the structure of a second embodiment of the present invention;

Figure 6 is a plan view showing the structure of a third embodiment of the present invention;

Figure 7 is a cross-sectional view showing the structure of a third embodiment of the present invention;

Figure 8 is a cross-sectional view showing the structure of an embodiment in which the optical sensing device is arranged in a grid according to the present invention; Figure 9 is a plan view showing the structure of the fourth embodiment of the present invention;

Figure 10 is a cross-sectional view showing the structure of a fourth embodiment of the present invention;

Figure 11 is a cross-sectional view showing the structure of a fifth embodiment of the present invention;

Figure 12 is a plan view showing the structure of a sixth embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION The present invention will be further described below in conjunction with the drawings and specific embodiments.

As shown in FIG. 2, in the first embodiment, the touch screen includes a substrate 100 and a light source 140; the substrate 100 has a top surface and a bottom surface, and the light emitted by the light source 140 is between the top surface and the bottom surface A frustrated total internal reflection occurs. The touch screen also includes a control unit and at least two optical sensing devices 120, of which 121 and 123 are two exemplary optical sensing devices specifically shown. Scattering data caused by said frustrated total internal reflection that is damaged by touch; each of said optical sensing devices 120 is coupled to said control unit, said control unit utilizing a location obtained from said optical sensing device 120 The scatter data determines the location of the touch on the top surface.

In addition, in conjunction with FIG. 3 , the touch screen further includes an auxiliary substrate 160 , and the auxiliary substrate 160 Located under the bottom surface, each of the optical sensing devices 120 is attached to the auxiliary substrate 160 and faces the bottom surface. The at least two optical sensing devices 120 are arranged in a first matrix. In other embodiments of the present invention, the at least two optical sensing devices 120 may also be arranged in a grid, and the specific number of the optical sensing devices 120 and the number and orientation of the mesh may be according to actual needs. determine.

The optical sensing device 120 can be a slot or reflective sensor including, but not limited to, one of a photosensitive resistor, a photodiode, a phototransistor, a photocoupler, or a photovoltaic cell, or a combination thereof.

Both the substrate 100 and the auxiliary substrate 160 may be made of a material having shock absorbing characteristics and disposed in the outer casing 180 of the touch screen. Acrylic materials, glass, plastic or other materials that have good transmission properties to light (at least in the light-emitting range of the display device) can also be used. In this embodiment, the substrate 100 and the auxiliary substrate 160 may each be made of an acrylic material.

The optical sensing device 120 can be attached to the auxiliary substrate 160 by adhesive bonding. In other embodiments, the optical sensing device 120 can also be formed on the auxiliary substrate 160 using a semiconductor deposition-etching process. Wherein, the optical sensing device 120 can be a transparent or opaque component. When the optical sensing device 120 is an opaque component, its size should be small enough to not affect the transmission of light from the displayed image.

By attaching each of the optical sensing devices 120 to the auxiliary substrate 160, the optical sensing device 120 does not have to be directly attached to the substrate 100 to protect the light emitted by the light source 140 in the Conditions for suppressing total internal reflection occur in the substrate 100. By arranging at least two of the optical sensing devices 120 into a first matrix or grid, the positions of the points on the touch screen can be uniformly marked to facilitate accurate sensing of single-point and multi-touch.

The control unit learns the scatter data of the position of the optical sensing device that is touched by means of an algorithm contained therein, the software controlling the algorithm can be in various forms and programming languages by different programmers prepared by.

The light source 140 may employ at least one (eg, four) light emitting diodes (LEDs) as light emitting elements. In other embodiments, the light source 140 may also employ at least one cold cathode fluorescent lamp (CCFL) as a light-emitting element; wherein each of the light-emitting elements is discretely arranged and placed at a corner of the substrate 100. In this embodiment, four LEDs are used as the light-emitting elements, respectively The four corners of the substrate 100 are described.

At this time, the angle at which the LED emits light needs to be specially designed to illuminate the inner surface of the substrate 100 with the LED light to generate a Frustrated Total Internal Reflection (FTIR) as shown by the broken line in FIG. (The total reflection in the substrate 100 described in the subsequent embodiments is indicated by a broken line). In other words, when the medium outside the substrate 100 is air, light emitted from the LED is totally reflected between the top surface and the bottom surface of the substrate 100. When a disturbing object (such as a skin, a finger, etc.) is touched on the top surface of the substrate 100, the total reflection condition near the touched point is destroyed, and part of the light will no longer be totally reflected to form a part. Scattering, producing scattered light. Specifically, as shown in FIG. 3, when the finger touches only the position 1 on the substrate (corresponding to a single touch), the total reflection condition at the position 1 is destroyed, and part of the light will no longer undergo total reflection to generate scattered light ( As shown by the direction of the solid arrow in Fig. 3, this scattered light can be induced by the optical sensing device 121 placed below the position 1. At this time, based on the position of the optical sensing device 121 that senses the scattered light, it can be determined that the touch occurs in an upper region corresponding to the position of the optical sensing device 121; that is, the control unit parses out the reception. When the position of the optical sensing device 121 is scattered, it is determined that the corresponding region located above the position is the touch position 1. Specifically, the position of the optical sensing device 121 can be represented by its coordinates in the first matrix (for the determined optical sensing device, its coordinates are known), as shown in FIG. 2 (2) , 1), it can be determined that the corresponding area above the coordinate (2, 1) position is the touch position 1.

When two fingers simultaneously touch position 1 and position 2 (corresponding to multi-touch) on the substrate, the total reflection conditions at position 1 and position 2 are destroyed, and some rays will no longer undergo total reflection to generate scattered light. (as indicated by the direction of the solid arrow in Fig. 3), this scattered light can be sensed by the optical sensing device 121 placed below the position 1 and the optical sensing device 123 below the position 2. At this time, the optical sensing devices 121 and 123 will sense the scattered light to generate scatter data, and the control unit coupled to the optical sensing devices 121 and 123 will acquire the scatter data, and The scattering data is analyzed to determine the position of the optical sensing devices 121 and 123 that sense the scattered light. According to the positions of the optical sensing devices 121 and 123, it can be determined that the touch occurs in an upper region corresponding to the positions of the optical sensing devices 121 and 123, and it is determined that the corresponding regions located above the position are respectively the touch position 1 and Touch position 2. With the same If the positions of the optical sensing devices 121 and 123 are represented by (2, 1) and (3, 2) by their coordinates in the first matrix, respectively, it can be determined that the coordinates are (2, 1) and ( 3, 2) The corresponding areas above the position are touch position 1 and touch position 2, respectively.

It should be noted that, in practice, as shown in FIG. 4, the light emitted from the light source to the substrate is divergent (as shown by the beams 1, 2, 3 in FIG. 4). If no optical compensation is made, the light in the substrate is easily distributed unevenly. Therefore, in various embodiments of the present invention, in order to enhance the uniformity of light in the substrate 100, a reflection device 102 may be attached to an edge of the substrate 100 away from the light source (the subsequent drawings are directly Inheritance, no longer repeat). Here, the reflecting means 102 is generally mounted only on the edge opposite to the light source, but is not limited to this type of mounting. The reflecting device 102 can be selected according to actual conditions. In the embodiments of the present invention, it may be partially selected, all selected, or not used at all. The reflective device 102 can be a reflective strip; the reflective strip can be made of a flexible material; the reflective strip can be adhesively bonded to the edge of the substrate 100.

As shown in FIG. 5, in order to prevent the optical sensing device 120 from directly adhering to the substrate 100, the light emitted by the light source 140 is generated in the substrate 100. The light transmissive film layer 162 may also be attached to the bottom surface under the condition of suppressing total internal reflection. Each of the optical sensing devices 120 is attached to the light transmissive film layer 162 to constitute a second embodiment of the present invention (in this embodiment, a schematic diagram of the suppressed total internal reflection occurring in the substrate and the optical transmission The description of the condition when the sensing device senses the scattered light is similar to the related description in the first embodiment, and will not be described again. The light transmissive film layer 162 may be formed by a plating process such as sputtering or deposition. The light transmissive film layer 162 may be formed of a material having good transmission properties to light. The transmittance of the display can be increased, and the condition that the light emitted by the light source is subjected to the total internal reflection in the substrate 100 can be protected, thereby facilitating accurate sensing of single-point and multi-touch.

It should be noted that the light source 140 may also use at least one light emitting diode or a cold cathode fluorescent lamp as the light emitting element, and each of the light emitting elements is continuously arranged on the side of the substrate 100; or the light source is infrared A tubular light source, the infrared tubular light source being disposed on a side of the substrate. That is, frustrated total internal reflection can be formed in the substrate 100 using an edge-lit backlight. The degree of uniformity of total reflection occurring in the substrate 100 can be enhanced to enhance the accuracy of single-point and multi-touch detection. As shown in FIG. 6 and FIG. 7, as a third embodiment of the present invention, the light source 142 uses a light emitting diode (LED) or an electroluminescent device (EL) as a light emitting element; each of the light emitting elements is arranged in a second matrix. Each of the light emitting elements is disposed between the optical sensing devices 120. The specific number of the light-emitting elements is determined according to actual needs. At this time, each of the light-emitting elements is placed under the bottom surface of the substrate 100, that is, the frustrated total internal reflection can be formed in the substrate 100 using the bottom-light backlight. The degree of uniformity of total reflection occurring in the substrate 100 can be enhanced to enhance the accuracy of single-point and multi-touch detection.

The angle at which the illuminating element emits light needs to be specifically designed to illuminate the inner surface of the substrate 100 with the illuminating element to produce suppressed total internal reflection. The light-emitting element may be fixed to the outer casing 180 of the display or to the additional fixing plate 182 of the outer casing 180. At this time, the light-emitting element is embedded in the fixing plate 182.

Wherein, when the angle of the light emitted by the light-emitting element is designed, the light-emitting element itself can have a certain deflection angle with respect to the plane of the substrate, and the light-emitting element itself can face the substrate 100 vertically, and the reflection device is added. (such as a total reflection prism, a plane mirror, or a curved mirror), when the light-emitting element emits light toward the inner surface of the substrate 100, frustrated total internal reflection occurs. Can be flexibly selected according to actual needs.

As shown in FIG. 7, when the finger touches only the position 1 on the substrate (corresponding to a single touch), the total reflection at the position 1 (shown by the dotted line in FIG. 7) is destroyed, and some of the light will no longer occur. The reflection produces a scattered light (as indicated by the direction of the solid arrow in Figure 7) which can be induced by the optical sensing device 121 placed below the position 1. At this time, based on the position of the optical sensing device 121 sensing the scattered light, it can be determined that the touch occurs in an upper region corresponding to the position of the optical sensing device 121. That is, when the control unit analyzes the position of the optical sensing device 121 that receives the scattering, it is determined that the corresponding region located above the position is the touch position 1. If the position of the optical sensing device 121 is represented by (2, 1) by its coordinates in the first matrix, it can be determined that the corresponding region above the coordinate (2, 1) position is the touch position 1.

When the finger touches position 1 and position 2 (corresponding to multi-touch) on the substrate at the same time, the total reflection conditions at position 1 and position 2 are destroyed, and some rays will not be totally reflected to generate scattered light (such as This scattered light can be induced by the optical sensing device 121 located below the position 1 and the optical sensing device 123 below the position 2, as indicated by the direction of the solid arrow in FIG. Judgment The fixed touch occurs in an upper region corresponding to the positions of the optical sensing devices 121 and 123, and it is determined that the corresponding regions above the position are touch position 1 and position 2, respectively. If the positions of the optical sensing devices 121 and 123 are represented by their coordinates in the first matrix as (2, 1) and (3, 2), respectively, it can be determined that the coordinates are (2, 1) and (3, 2) The corresponding areas above the position are touch position 1 and touch position 2, respectively.

As shown in Fig. 8, as another embodiment of the present invention, the touch panel may not include an auxiliary substrate or a light transmissive film layer attached to a bottom surface of the substrate. At this time, the at least two optical sensing devices may be arranged in a grid, and each of the optical sensing devices arranged in a grid constitutes a web 162 to which an edge is attached to the outer casing of the touch screen. In other words, at this time, each of the optical sensing devices no longer needs to be carried by the auxiliary substrate or the light transmissive film layer, and only needs to be transferred from the touch screen by means of a mesh connection between the optical sensing devices. The outer casing can be carried. On the basis of this embodiment, the light source is selected in any of the ways set forth in the foregoing embodiments, and may constitute an embodiment of the present invention. In addition, in various embodiments, the schematic diagram of the frustrated total internal reflection occurring in the substrate and the description of the condition when the optical sensing device senses the scattered light and the related descriptions of applying the positioning in the embodiment are the same as The related description in the second embodiment is similar, and details are not described herein again.

As shown in FIG. 9, as a fourth embodiment of the present invention, a touch screen includes a substrate 100 and a light source 140; the substrate 100 has a top surface and a bottom surface, and the light source 140 includes two specific exemplary light sources shown 141 and 143, and the light emitted by the light source 140 undergoes frustrated total internal reflection between the top surface and the bottom surface. The touch screen also includes a control unit and at least two optical sensing devices 122, of which 121 and 123 are two exemplary optical sensing devices specifically shown. Each of the optical sensing devices 122 has a continuous structure that varies regularly (e.g., a strip of uniform width, a strip shape, or even a diamond or rectangle that is connected only by one corner). Each of the optical sensing devices 122 is vertically and parallelly arranged and intersects with a direction of light emitted by the light source 140. Each of the optical sensing devices 122 is placed under the bottom surface to capture scatter data caused by the frustrated total internal reflection due to a touch on the top surface. Each of the optical sensing devices 122 is also coupled to the control unit, the control unit utilizing the scatter data acquired from the optical sensing device 122 to determine a touch location on the top surface.

The light source 140 uses at least two light emitting diodes or a cold cathode fluorescent lamp as the light emitting elements; each of the light emitting elements is continuously arranged and placed on the side of the substrate 100. By having each of the optical sensing devices 122 have a continuous structure that changes regularly, and the optical sensing devices 122 are separated and parallel, and intersect with the direction of the light emitted by the light source 140, The direction of the light and the continuous direction of the optical sensing device 122 intersecting with it as coordinates, marking the position of each point on the same optical sensing device 122, thereby marking the position of each point on the touch screen, which facilitates accurate sensing of a single point and Multi-touch.

Wherein, the light emitted by each of the light-emitting elements is made parallel, and even the direction of the light emitted by each of the optical sensing devices 122 and each of the light-emitting elements is perpendicular, thereby uniformly marking the positions of the points on the touch screen, which is advantageous for Accurately sense single and multi-touch.

Specifically, in conjunction with FIG. 10, when the finger touches only the position 1 on the substrate (corresponding to a single touch), the condition of total reflection at position 1 (shown by a broken line in FIG. 10) is destroyed, and part of the light will no longer occur. Total reflection produces scattered light (as indicated by the solid arrow in Figure 10), which can be induced by optical sensing device 121 placed below position 1. At this time, according to the position of the optical sensing device 121, only the touch can be determined to occur in an upper region corresponding to the position of the optical sensing device 121 (for example, when the optical sensing device 121 is strip-shaped, only It is determined that the touch occurs in a strip area located above the strip area). At this time, in order to determine the specific position where the touch occurs in the corresponding area, it is necessary to judge the control of the light-emitting element in conjunction with the control unit. That is, when the control unit parses the position of the inductively scattered optical sensing device 121, the position of the light-emitting element operating under the control of the control unit is simultaneously determined (eg, the optical sensing device 121 is resolved). When the scattering is sensed, the light-emitting element that determines the operation is 141), and the intersection of the strip-shaped area and the light-emitting element 141 is determined to be the touch position 1. As an example, in this case, the arrangement order of the optical sensing devices may be set to the ordinate, the arrangement order of the illuminating elements may be set to the abscissa, and the touch position may be indicated by the coordinates. For example, the optical sensing device 121 is located in the first column of the arrangement order of the optical sensing devices, and the working light-emitting element 141 is located in the third row of the arrangement order of the respective light-emitting elements, and can be determined to be located. The corresponding area above the coordinate (3, 1) position is the touch position 1.

When the finger touches position 1 and position 2 (corresponding to multi-touch) on the substrate at the same time, the total reflection conditions at position 1 and position 2 are destroyed, and some rays will not be totally reflected to generate scattered light (such as This scattered light can be sensed by the optical sensing device 121 located below the position 1 and the optical sensing device 123 below the position 2, as indicated by the solid arrow in Figure 10. versus Similarly, at this time, it is determined that the touch occurs in an upper region (e.g., a strip-shaped region) corresponding to the positions of the optical sensing devices 121 and 123. When the control unit parses the positions of the inductively scattered optical sensing devices 121 and 123, simultaneously determines the position of the light-emitting elements operating under the control of the control unit (eg, parsing the optical sensing device 121) When the light-emitting elements that determine the operation are 141 and 143), the intersection of the two-shaped area and the light-emitting elements 141 and 143 is determined to be the touch position 1 and the position 2. Similarly, the optical sensing devices 121 and 123 are respectively located in the first column and the third column in the arrangement order of the optical sensing devices, and the working light-emitting elements 141 and 143 are respectively located in the respective light-emitting elements. When the third row and the fifth row in the arrangement order are arranged, it can be determined that the corresponding regions located above the coordinates (3, 1) and (5, 3) are touch position 1 and touch position 2, respectively.

In this embodiment, the touch screen further includes an auxiliary substrate, the auxiliary substrate is located under the bottom surface, and each of the optical sensing devices 122 is attached to the auxiliary substrate and faces the bottom surface. The specific number of optical sensing devices 122 is determined according to actual needs.

The auxiliary substrate may be made of a material having shock absorbing characteristics and disposed in a casing of the touch screen. Acrylic materials, glass, plastic or other materials that have good transmission properties to light can also be used. In this embodiment, the substrate may be made of an acrylic material.

The optical sensing device 122 can be attached to the auxiliary substrate by adhesive bonding. In other embodiments, the optical sensing device 122 can also be formed on the auxiliary substrate using a semiconductor deposition-etch process. The optical sensing device 122 can be a slot or reflective sensor including, but not limited to, one or a combination of a photoresistor, a photodiode, a phototransistor, a photocoupler, or a photovoltaic cell.

By attaching each of the optical sensing devices 122 to the auxiliary substrate, the optical sensing device does not have to be directly attached to the substrate 100 to protect the light emitted by the light source from being in the substrate 100. A condition in which total internal reflection is suppressed.

In this embodiment, the substrate 100 and the auxiliary substrate may be made of an acrylic material; in other embodiments, the substrate 100 and the auxiliary substrate may also be made of glass, plastic or other. A material that has good transmission properties for light.

The light source 140 may employ at least one light emitting diode (LED) as a light emitting element; in other embodiments, the light source 140 may employ at least one cold cathode fluorescent lamp (CCFL) as a light emitting element.

As shown in FIG. 11, in order to prevent the optical sensing device 122 from directly adhering to the substrate 100, the light emitted by the light source is protected in the substrate 100. The light transmissive film layer 162 may also be attached to the bottom surface under the condition of suppressing internal reflection. Each of the optical sensing devices 122 is attached to the light transmissive film layer 162 to form a fifth embodiment of the present invention (in this embodiment, a schematic diagram of the suppressed total internal reflection occurring in the substrate and the optical transmission The description of the condition when the sensing device senses the scattered light is similar to the related description in the second embodiment, and the description of the implementation of the positioning in this embodiment is similar to that in the fourth embodiment, and will not be described again. The light transmissive film layer 162 may be formed by a plating process such as sputtering or deposition. The light transmissive film layer 162 may be formed of a material having good transmission properties to light, which may increase the transmittance of the display and protect the condition of the total light reflection of the light emitted by the light source 140 in the substrate 100. , Conducive to accurate sensing of single point and multi-touch.

As shown in FIG. 12, as a sixth embodiment of the present invention, the light source 142 uses a light emitting diode (LED) or an electroluminescent device (EL) as a light emitting element; each of the light emitting elements is arranged in a second matrix, the second An optical sensing device 122 is interposed between rows or columns of the matrix. The specific number of the light-emitting elements is determined according to actual needs. At this time, each of the light-emitting elements is placed under the bottom surface of the substrate 100, that is, a frustrated total internal reflection can be formed in the substrate 100 using a bottom-light backlight. The degree of uniformity of total reflection occurring in the substrate 100 can be enhanced to enhance the accuracy of single-point and multi-point touch detection.

The angle at which the illuminating element emits light needs to be specifically designed to illuminate the inner surface of the substrate with the illuminating element to produce suppressed total internal reflection. The illuminating element may be fixed to the outer casing of the display or to an additional fixing plate in the outer casing.

Wherein, when the angle of the light emitted by the light-emitting element is designed, the light-emitting element itself can have a certain deflection angle with respect to the plane of the substrate, and the light-emitting element itself can face the substrate vertically, and the reflecting device is added ( For example, a total reflection prism, a plane mirror, or a curved mirror causes the light-emitting element to emit light toward the inner surface of the substrate to cause suppressed total internal reflection. According to Actually, flexible choices are required.

At this time, regardless of whether the finger makes a single touch or a multi-touch, the total reflection condition at the touch position is destroyed, and some of the light will no longer be totally reflected to generate scattered light, which can be placed below the touch position. The optical sensing device senses. At this time, based on the position of the optical sensing device that senses the scattered light, it can be determined that the touch occurs in an upper region corresponding to the position of the optical sensing device. That is, when the control unit analyzes the position of the optical sensing device that receives the scattering, it is determined that the corresponding region located above the position is the touched position. Specifically, the position of the optical sensing device can be represented by its coordinates in the first matrix (for the determined optical sensing device whose coordinates are known), then the corresponding position above the coordinate position can be determined. The area is the touch location.

By sensing at least two optical sensing devices in the touch screen, and using the optical sensing devices to mark the positions of the points on the touch screen, and using the control unit coupled to the optical sensing device, the sensing is sensed. The scattering data of the position of the optical sensing device that is touched makes it possible to accurately sense single-point and multi-touch.

Furthermore, the present invention also provides a touch system comprising the above touch screen, and the touch system may be a touch display formed by mounting the touch screen on a display surface.

Introducing at least two optical sensing devices into the touch screen included in the touch system, and marking the positions of the points on the touch screen with each of the optical sensing devices, thereby utilizing control coupled to the optical sensing device The unit, which knows the scatter data of the position of the optical sensing device that is touched to the touch, enables accurate sensing of single-point and multi-touch. The other embodiments are obtained by the skilled person in accordance with the technical solution of the present invention, and are also within the scope of the technical innovation of the present invention.

Claims

Rights request

A touch screen comprising: a substrate and a light source; the substrate having a top surface and a bottom surface, wherein light emitted by the light source undergoes frustrated total internal reflection between the top surface and the bottom surface, and is characterized by: The control unit and the at least two optical sensing devices, each of the optical sensing devices suppresses internal reflection-induced scattering data; each of the optical sensing devices is coupled to the control unit, and the control unit utilizes The scatter data acquired by the optical sensing device determines a touch location on the top surface.

2. The touch screen according to claim 1, wherein: a reflective device is attached to an edge of the substrate away from the light source.

The touch screen according to claim 1, wherein: the touch screen comprises an auxiliary substrate, the auxiliary substrate is located under the bottom surface, and each of the optical sensing devices is attached to the auxiliary substrate and faces the same Or a light transmissive film layer is attached to the bottom surface, and each of the optical sensing devices is attached to the light transmissive film layer.

The touch screen according to any one of claims 1 to 3, wherein the at least two optical sensing devices are arranged in a first matrix or grid.

The touch screen according to claim 4, wherein the light source uses at least one light emitting diode or a cold cathode fluorescent lamp as the light emitting element; each of the light emitting elements is arranged separately and placed at a corner of the substrate.

The touch screen according to claim 4, wherein the light source uses at least one light emitting diode or a cold cathode fluorescent lamp as the light emitting element; each of the light emitting elements is continuously arranged and placed on a side of the substrate.

7. The touch screen of claim 4, wherein: the light source is an infrared tubular light source, and the infrared tubular light source is disposed on a side of the substrate.

The touch screen according to claim 4, wherein: the light source uses a light emitting diode or an electroluminescent device as a light emitting element; each of the light emitting elements is arranged in a second matrix, and each of the light emitting elements is placed in the Between optical sensing devices.

The touch screen according to any one of claims 1 to 3, characterized in that: The optical sensing device has a continuous structure that varies in a regular manner, and each of the optical sensing devices is arranged in a discrete, parallel arrangement and intersects with a direction of light emitted by the light source.

The touch panel according to claim 9, wherein the light source uses at least two light emitting diodes or a cold cathode fluorescent lamp as the light emitting elements; each of the light emitting elements is continuously arranged and placed on a side of the substrate.

The touch panel according to claim 10, wherein the light emitted from each of the light-emitting elements is parallel.

The touch panel according to claim 11, wherein each of the optical sensing devices is perpendicular to a direction of light emitted by each of the light emitting elements.

The touch panel according to claim 9, wherein: the light source uses a light emitting diode or an electroluminescent device as a light emitting element; each of the light emitting elements is arranged in a second matrix, and rows or columns of the second matrix The optical sensing device is spaced apart.

The touch panel according to claim 13, wherein the light emitted from each of the light-emitting elements is parallel.

The touch panel according to claim 14, wherein each of the optical sensing devices is perpendicular to a direction of light emitted by each of the light-emitting elements.

The touch screen according to any one of claims 1 to 15, wherein the optical sensing device is one or a combination of a photoresistor, a photodiode, a phototransistor, a photocoupler or a photovoltaic cell.

17. A touch system, the touch system comprising the touch screen of any of claims 1-16.