WO2013117100A1

WO2013117100A1 - Method for determining position of touch point on touch panel, and touch panel

Info

Publication number: WO2013117100A1
Application number: PCT/CN2012/086203
Authority: WO
Inventors: 曲连杰; 郭建
Original assignee: 北京京东方光电科技有限公司
Priority date: 2012-02-07
Filing date: 2012-12-07
Publication date: 2013-08-15
Also published as: CN102778976B; CN102778976A

Abstract

Embodiments of the present invention provide a method for determining a position of a touch point on a touch panel, and a touch panel. The touch panel comprises a display screen in a polygonal structure. The method comprises: arranging a reflecting mirror on an inner surface of any one border of the display screen; arranging an image acquisition unit on a point of intersection between any two neighboring borders other than the border provided with the reflecting mirror; and when the display screen is touched, determining a position of a touch point according to an imaging position of the touch point on the image acquisition unit and an imaging position of the touch point on the image acquisition unit after passing through the reflecting mirror.

Description

Method for determining touch point position on touch screen and touch screen

Embodiments of the present invention relate to a method of determining a location of a touch point on a touch screen and a touch screen. Background technique

The touch panel is an inductive liquid crystal display device capable of receiving an input signal of a contact or the like. When the contact contacts the graphic button on the screen, the tactile feedback system on the screen can drive various connection devices according to a preset program. And through the liquid crystal display image presents a variety of information.

Currently, there are four main types of touch screens: resistive touch screens, capacitive touch screens, surface acoustic wave touch screens, and infrared scanning touch screens.

The above various types of touch screens have certain limitations in the use environment. At the same time, they all have the following disadvantages: When the size of the touch screen becomes larger, the manufacturing cost also becomes larger; when applied to a large-sized touch screen, the signal is greatly attenuated due to propagation in the film, resulting in inaccurate touch point detection. . Therefore, the above four types of touch screens are not suitable for large sizes.

At present, a technique for applying a dual CCD system to touch position determination has been proposed. In this technique, a dual CCD measurement system is mounted on the display surface. This technology has no limitation on the display mode, and can be used in combination with a display such as a CRT, DLP, PDP, LCD, or the like. In addition, regardless of the size of the display screen, the hardware configuration of the dual CCD monitoring system does not change except for the backlight. Therefore, the larger the size, the more cost-effective and concise the dual CCD measurement system makes it more suitable for larger touch screens.

However, in the dual CCD measurement system, two sets of signal detection systems are required to obtain the coordinate position, the structure is complicated, and since the two CCDs interact with each other, the positional debugging of the double CCD is also complicated. Summary of the invention

According to an embodiment of the present invention, a method of determining a location of a touch point on a touch screen is provided. The touch screen contains a display with a polygonal structure. The method comprises: providing a mirror on an inner surface of any one of the frames of the display screen; any other phase except the frame provided with the mirror An image collection unit is disposed at the intersection of the adjacent two borders. The method further includes: when the display screen is touched, determining a position of the touch point according to a position where the touch point is imaged on the image collection unit and according to a position at which the touch point is imaged on the image collection unit by the mirror .

According to another embodiment of the present invention, a touch screen is provided. The touch screen includes a display screen of a polygonal structure, a mirror disposed on an inner surface of any one of the frames of the display screen, and an intersection disposed at any other adjacent two borders except the frame provided with the mirror Image collection unit. A touch point on the display screen is imaged on the image collection unit and imaged on the image collection unit by the mirror. Determining the touch point according to a position at which the touch point is imaged on the image collection unit and according to a position at which the touch point is imaged on the image collection unit by the mirror s position.

According to an embodiment of the present invention, the dual image panning unit system is improved, and only one image collecting unit and one mirror are combined with the display screen to realize the touch screen technology. Therefore, according to the touch screen of the embodiment of the invention, the larger the size, the more prominent the cost advantage and simplicity of the system, and the more suitable for the touch screen of a larger size.

In addition, the single image collection unit according to the embodiment of the present invention reduces the number of image collection units, is simpler in structure, and is more convenient to install than the conventional dual image collection unit. In addition, only one image collection unit measurement system is not affected by other effects, so the position debugging of the single image collection unit is also easier. DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below. It is obvious that the drawings in the following description relate only to some embodiments of the present invention, and are not intended to limit the present invention. .

1 is a schematic diagram of determining a touch point according to an embodiment of the present invention;

2 is a schematic structural diagram of a quadrilateral touch screen according to an embodiment of the present invention;

3 is a schematic structural diagram of a triangular touch screen according to an embodiment of the invention;

4 is a schematic structural view of a hexagonal touch screen according to an embodiment of the invention. detailed description

In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the following will be combined with the present invention. The technical solutions of the embodiments of the present invention are clearly and completely described in the accompanying drawings. It is apparent that the described embodiments are part of the embodiments of the invention, rather than all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the described embodiments of the present invention without departing from the scope of the invention are within the scope of the invention.

In accordance with an embodiment of the present invention, a conventional dual image collection unit measurement system is modified to combine an image collection unit detection imaging system with a display screen provided with a mirror to form a touch screen. In this way, the single image 釆 unit is more simplified and more convenient to install than the dual image 单元 unit, and the position debugging of the single image 单元 unit is also easier.

The so-called image collection unit detection imaging system refers to an image collection unit. The image collection unit may be a CCD or a complementary metal oxide semiconductor (CMOS, Complementary Metal Oxide Semiconductor).

According to an embodiment of the present invention, a method for determining a position of a touched point on a touch screen includes the following steps: Step 101: setting a mirror on an inner surface of any one of the frames of the display screen of the polygonal structure; and in addition to the frame provided with the mirror An image collection unit is disposed at an intersection of any other adjacent two borders;

Step 102: When the display screen is touched, the position of the touched point is determined according to the position where the touched point is imaged on the image collecting unit and according to the position where the touched point is imaged on the image collecting unit by the mirror.

In step 101, the method for setting the image collection unit is: aligning the intersection of the adjacent two borders where the image collection unit is located with the d and the hole on the lens of the image collection unit, and making the image collection unit and adjacent One of the two borders is angled, specifically, the intersection of the adjacent two borders is set to the origin (9, such that one of the adjacent two borders is located on the X axis, and the direction perpendicular to the X axis is taken as the y axis ( The angle between the y-axis and the other frame is less than 90 degrees); the angle between the adjacent two frames is set such that the central normal of the lens of the image collection unit is at an angle to the X-axis (ie, the frame on the X-axis). Ground, Θ is _φ ΐ2.

Preferably, the above polygon is a quadrangle. More preferably, the above polygon is a rectangle.

The rectangular display screen is taken as an example to describe in detail how to determine the touch point.

1 is a schematic diagram of determining touch points in accordance with an embodiment of the present invention. As shown in FIG. 1, a mirror is disposed on the inner surface of the frame 4 of the display screen 1 (for example, see the mirror 3 of FIG. 2); the small hole 13 of the lens 8 of the image collecting unit 2 and the frame 6 and the frame 5 Align the intersection point, set the intersection point as the origin point, and make any border in the border 6 and the border 5 on the X axis, for example, make the border 5 at the X The axis, the axis where the frame 6 is located is set to the _y axis (the frame 6 is perpendicular to the frame 5); the angle between the frame 5 and the frame 6 is 90 degrees); the central normal 16 of the lens 8 is at an angle to the X axis, preferably θ=φΐΐ= 5 degrees).

In this case, the method of determining the position of the touch point 12 is:

1. Determine the position at which the touch point 12 is imaged on the image collection unit 2:

The touch point 12 is imaged on the imaging surface of the lens 8 through the lens 8, and the image point 15 of the touch point 12 on the imaging surface is detected by the image collection unit chip 9; wherein the light on the touch point 12 is from the backlight of the touch screen 11 (for example, the infrared backlight 11 shown in Figure 3).

The distance between the image point 15 and the projection point 17 of the central normal 16 on the imaging plane is ^β ι ; the line between the touch point 12 and the image point 15 is at an angle to the central normal 16 .

Thus, the position at which the touch point 12 is imaged on the image collecting unit 2 can be determined.

2. Determining the position at which the touch point 12 is imaged on the image collecting unit 2 by the mirror: The image point 12' imaged by the touch point 12 through the mirror passes through the lens 8 and is imaged on the imaging surface of the lens 8 and is imaged by the image The unit cell 9 detects the image point 14 on the imaging surface after the touch point 12 passes through the mirror;

The distance between the image point 14 and the projection point 17 is; the line between the image point 12' and the image point 14 is at an angle to the center normal 16 .

Thus, the position at which the touch point 12 is imaged on the image collecting unit 2 after passing through the mirror can be determined. The image collection unit chip 9 uses the following method when detecting image points on the imaging surface: The image collection unit 2 includes an image point analyzer for analyzing the image point position to confirm the clearest position. The position of the image point is used to adjust the position of the image pickup unit chip 9. Specifically, it needs to be adjusted along the direction of the center normal 16 of the lens so that the image collecting unit chip 9 can detect the clearest image point. During processing, it can be assumed that the position at which the image pickup unit chip 9 is located is the position of the image plane on which the image point is located when the image is most sharp.

In addition, the above-described application of imaging through the lens on the imaging surface is the principle of aperture imaging of the lens.

2NL

x = -

M + N

2MNL

y

Third, calculate the position of the touch point (X, _y) as: M + N

^ stan d ^ _ stan 0 -a ₂ The length of the border 5 on the x-axis; s is the origin (the distance from the projection point 17, the value of s varies with the position of the image unit cell 9 of the image.

It can be concluded from the above formula that when taking 90 degrees and taking /2=45 degrees, the calculation of the touch point position is relatively simple, and the detection range is wide. The image collection unit detection imaging system can detect any touch on the display screen. point.

Based on the above-described method of determining a touch point on a touch screen, an embodiment of the present invention also proposes a touch screen.

2 is a schematic structural view of a quadrilateral touch screen according to an embodiment of the invention. As shown in FIG. 2, a touch screen according to an embodiment of the present invention includes: a display screen of a polygonal structure, a mirror 3 disposed on an inner surface of any one of the frames of the display screen 1 (the frame 4 in this embodiment), and a setting The image collection unit 2 at the intersection of any two other frames except the frame provided with the mirror. In Figure 2, φ is the angle between the border 6 and the border 5.

Here, the display 1 is not limited, and it may be a display such as a CRT, DLP, PDP, LCD, or the like.

The touch point 12 on the display screen 1 is imaged 15 on the image collection unit 2, and the touch point 12 is imaged 14 on the image collection unit 2 by the mirror 3, which according to the position of the image 15 and the position of the image 14. , determine the position of the touch point 12. The specific determination method is the same as the position measurement method of the above touch point, and details are not described herein again.

When the position of the image collection unit 2 is set: the intersection of the two borders of the angle at which the image collection unit 2 is located (ie, the intersection of the border 6 and the frame 5 in FIG. 3) and the small lens 8 of the image collection unit 2 The holes 13 are aligned; and the center normal 16 of the lens 8 is angled with the frame adjacent to the frame on which the mirror 3 is disposed in the two frames (in the present embodiment, the frame 6 and the frame 5 are adjacent to the frame 4 With the bezel 5, the center normal 16 of the lens 8 is at an angle to the bezel 5). In this way, the position of the image collection unit can be determined.

Preferably, θ= _φ β is an angle of the angle between the two frames; preferably, (^ is 90 degrees, at this time, the calculation of the position of the touch point is relatively simple, the detection range is wide, and the image collection unit detects the image. The system can detect any touch point on the display.

In the touch screen of the embodiment of the present invention, since the image capturing unit detecting imaging system is a small hole imaging principle of the lens, the change of the s value when imaging on the image collecting unit is small, and thus the embodiment of the present invention is applicable to Large screen touch screen. It should be pointed out that due to the wide range of applications of touch screens, including low brightness and high brightness working environment. As the brightness of the working environment changes, the brightness of the display screen also changes. These changes in the external ambient light have a direct impact on the image collection unit detection imaging system. In order to eliminate the interference of these external visible lights, it is necessary to combine an infrared-based optical system to eliminate the interference of visible light to the image collection unit detecting imaging system.

As shown in Fig. 3, an infrared light transmitting sheet 10 is disposed on the outer surface of the lens 8, and an infrared backlight 11 is disposed on the outer surface of the frame 5 on the X axis. The touch point 12 utilizes infrared light provided by the infrared backlight 11 , passes through the infrared transparent sheet 10 , is imaged on the imaging surface through the lens 8 , passes through the mirror 3 , and passes through the lens 8 after passing through the infrared transparent sheet 10 . Imaging on the imaging surface.

The reason why the infrared-based optical system is combined is that the infrared light is invisible, and does not affect the display of the display screen and the external environment. At the same time, the infrared light can follow the imaging principle of the camera and image on the image collecting unit. The infrared light transmissive sheet 10 allows infrared light to pass directly, and the visible light is filtered and cannot pass. For example, the infrared light transmitting sheet 10 has a light transmittance of more than 95% for infrared light and a light transmittance of less than 5% for visible light.

When the display is touched, the touch point 12 can be illuminated by an infrared backlight even in a dark environment.

The infrared light of 11 "illuminates" and produces a reflection. The reflected infrared light enters the lens 8 through the infrared transparent sheet 10 and is imaged on the imaging surface, and the image spot on the imaging surface is detected by the image collecting unit chip 9; meanwhile, the side mirror 3 can reflect the infrared light again. The image plane is imaged by the lens 8, and the image point on the image plane is detected by the image collecting unit chip 9. Therefore, regardless of the intensity of the ambient light and the brightness of the display content of the display, the reflected light of the visible light can be filtered by the infrared transparent sheet 10, so that the image collection unit does not affect the imaging system.

The above method of the embodiment of the present invention is also applicable to a polygonal touch screen such as a trigonal shape or a hexagonal shape. FIG. 3 is a schematic structural view of a triangular touch screen; FIG. 4 is a schematic structural view of a hexagonal touch screen.

The above is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. The scope of the present invention is defined by the appended claims.

Claims

Claim

What is claimed is: 1. A method of determining a location of a touch point on a touch screen, the touch screen comprising a display having a polygonal structure, wherein

The method includes: providing a mirror on an inner surface of any one of the frames of the display screen; and providing an image collecting unit at an intersection of any adjacent two borders except the frame provided with the mirror; And

The method further includes:

When the display screen is touched, the position of the touch point is determined according to the position where the touch point is imaged on the image collection unit and according to the position at which the touch point is imaged on the image collection unit by the mirror.

The method for determining the position of a touched point on the touch screen according to claim 1, wherein the image collecting unit is disposed at an intersection of the adjacent two borders, comprising:

Aligning the intersection of the adjacent two borders with the aperture on the lens of the image collection unit; setting the intersection of the adjacent two borders as the origin (9, so that one of the adjacent two borders is located at the X The axis, the direction perpendicular to the X axis as the y axis;

Setting the angle between the adjacent two frames to and

The central normal of the lens is angled to the X axis.

A method of determining a position of a touched point on a touch screen according to claim 2, wherein said angle Θ is φβ.

4. The method of determining a position of a touch point on a touch screen according to claim 2, wherein the method further comprises: providing an infrared light transmissive sheet on an outer surface of the lens; and setting on an outer surface of the frame on the X axis Infrared backlight

Using the infrared light provided by the infrared backlight, the touch point is imaged on the image collecting unit after passing through the infrared transparent sheet, and the touch point passes through the mirror and then passes through the infrared A light transmissive sheet is imaged on the image collection unit.

The method for determining a position of a touch point on a touch screen according to claim 3 or 4, wherein determining a position at which the touch point is imaged on the image collection unit comprises:

The touch point is imaged by the lens on an imaging surface of the lens, and the image point on the imaging surface is detected by the image collection unit chip;

a projection point of the touch point on the imaging surface and a projection point of the central normal on the imaging surface The distance between the touch point and the line of the touch point on the image plane is at an angle to the center normal.

The method for determining a position of a touch point on a touch screen according to claim 5, wherein determining a position at which the touch point is imaged on the image collecting unit by the mirror comprises:

Passing an image point imaged by the touch point through the mirror through the lens, imaging on an imaging surface of the lens, and detecting an image point on the imaging surface by the image collecting unit chip;

a distance between the image point of the touch point on the imaging plane and the projection point through the mirror; the image point that is imaged by the touch point after the mirror and the touch point pass the reflection The line between the image points of the mirror on the imaging surface is at an angle to the central normal.

7. The method of determining a location of a touch point on a touch screen according to claim 6, wherein said determining said

2NL

X = - a _x + s tan θ _ s tan 0 -a ₂

M = ¹ N

The position of the touch point (x, _y ) is: Μ + N · where s - a _x tan^ . s + a ₂ ta O . The length of the frame located on the x-axis; Describe the origin (distance from the projection point).

8. A touch screen, wherein the touch screen comprises a display screen of a polygonal structure, a mirror disposed on an inner surface of any one of the frames of the display screen, and any other arrangement than the frame provided with the mirror An image collection unit at an intersection of two adjacent borders;

a touch point on the display screen is imaged on the image collection unit and imaged on the image collection unit by the mirror;

Determining the touch point according to a position at which the touch point is imaged on the image collection unit and according to a position at which the touch point is imaged on the image collection unit by the mirror s position.

The touch screen according to claim 8, wherein an intersection of the adjacent two borders is aligned with an aperture on a lens of the image collection unit; an angle between the adjacent two borders is ^

The intersection of the adjacent two borders is an origin (9, one of the adjacent two borders is located on the X axis, and the direction perpendicular to the X axis is the y axis;

The center normal of the lens is at an angle to the border of the adjacent two frames on the X axis.

10. The touch screen of claim 9, wherein said is /2.

The touch screen of claim 9, wherein the touch screen further comprises: An infrared backlight disposed on an outer surface of the border of the X-axis of the adjacent two frames for providing infrared light to the touch point on the display screen;

An infrared light transmissive sheet disposed on an outer surface of the lens for filtering visible light, wherein a touch point on the display screen utilizes infrared light provided by the infrared backlight, after passing through the infrared light transmissive sheet The image collecting unit is imaged, and is imaged on the image collecting unit through the infrared light transmissive sheet through the mirror.

12. The touch screen of claim 8, the display screen being a CRT, DLP, PDP or LCD.

13. The touch screen of claim 8, wherein the polygon is a quadrangle, a triangle, or a hexagon.

The touch screen according to claim 8, wherein the image collection unit is a CCD or a CMOS.