TWI453641B - Touch control device - Google Patents

Description

Touch device

The invention relates to a touch device.

With the development of society and the advancement of science and technology, the interface is more user-friendly, and the display with simple touch screen is widely used in displays such as personal computers, mobile phones, televisions, cameras, measuring instruments, etc., especially with high image quality. Thin Film Transistor Liquid Crystal Display (TFT LCD), which has superior space utilization efficiency, low power consumption, and no radiation, has gradually become the mainstream in the market.

A display with a touch screen typically includes a display panel and a touch screen disposed above the display panel. According to the medium used and the working principle, the touch screen can be divided into resistive, capacitive, infrared and surface acoustic wave types. At present, resistive and capacitive types are more commonly used, but they all need to be provided with sensing circuits on the panel, and the structure and process are complicated.

In view of this, it is necessary to provide a touch device having a simple structure and a simple process.

A touch device includes a display screen, a line light source module, a reflector, and an image capture module. The line light source module is disposed along an edge of the display screen, and the line light source module includes a strip-shaped light exit port for emitting light. The reflecting plate is disposed at a periphery of the display screen, and the light emitted from the strip-shaped light exiting port is reflected by the reflecting plate to form a staggered light field on the surface of the display screen. The image capturing module is disposed between adjacent edges of the display screen, and the image capturing module is located on the same side of the display screen as the line light source module. The vertical distance between the viewing end of the image capturing module and the display screen is greater than the distance between the light field and the display screen. Image capture module The ingesting range is the surface of the display screen. When an object intersects the light field, the image capturing module receives the light after the object reflects a part of the light in the light field.

The touch device only needs to set a line light source module, a reflection plate and an image capturing module on the outside of the display screen, and the structure and the process are relatively simple.

100,200‧‧‧ touch device

12‧‧‧ display panel

122‧‧‧ display

124‧‧‧Protection shell

18,20,22‧‧‧Image capture module

14‧‧‧Line light source module

150‧‧‧Lighting trough

126,128,130,132‧‧‧Border

142‧‧‧Infrared point source

144‧‧‧Light guiding structure

148‧‧‧Light reflective layer

152‧‧‧Light Guide

146‧‧‧Into the glossy surface

16‧‧‧reflector

180‧‧‧Light field

1 is a perspective view of a touch device according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram of a light field formed on the surface of the display screen of the touch device of FIG. 1. FIG.

3 is a perspective view of a touch device according to a second embodiment of the present invention.

The invention will now be described in further detail with reference to the accompanying drawings.

Referring to FIG. 1 , a first embodiment of the present invention provides a touch device 100 including a display panel 12 , a line light source module 14 , three reflective panels 16 , and an image capturing module 18 .

In this embodiment, the display panel 12 is a liquid crystal display panel. It can be understood that the display panel 12 can also be a field emission display panel, a plasma display panel, or the like. The display panel 12 includes a rectangular display 122 and a protective cover 124 surrounding the four sides of the display 122. The protective cover 124 is used to fix the display screen 122 to facilitate the display panel 12 to be connected to other structures such as a display base or the like. The protective casing 124 has four adjacent frames 126, 128, 130 and 132, which respectively correspond to the four sides of the fixed display screen 122.

The line light source module 14 is mounted on the frame 126 of the protective cover 124. The line light source module 14 includes an infrared point source 142 and a light guiding structure 144. The infrared point source 142 can be a light emitting diode that emits infrared light. In this embodiment, the light guiding structure 144 is cylindrical, and its main axis direction is parallel to the extending direction of the frame 126. Preferably, the length of the light guiding structure 144 is greater than the width of the side of the display screen 122 corresponding thereto. The light guiding structure 144 includes a light guiding portion 152 and a light reflecting layer 148. The light guiding portion 152 has a cylindrical shape, and one end surface thereof is a light incident surface 146 for allowing light to enter the light guiding portion 152. The infrared point light source 142 is disposed opposite to the light incident surface 146. The light reflecting layer 148 is disposed on a side surface of the light guiding portion 152 and a surface opposite to the light incident surface 146. A light-emitting groove 150 is defined in the light-reflecting layer 148. The light-emitting groove 150 extends in a direction parallel to the extending direction of the frame 126 and opposite to the line light source module 14. The light-emitting groove 150 is a part of the light-reflecting layer. The groove formed by 148. The light incident from the light incident surface 146 into the light guiding structure 144 is reflected by the light reflecting layer 148 and is emitted from the light exiting groove 150. Preferably, the length of the light exiting groove 150 is greater than or equal to the width of the side of the display screen 122 adjacent to the frame 126, so that the outgoing light can be spread outside the surface of the entire display screen 122. Preferably, the light emerging from the light exit slot 150 is substantially parallel to the display surface of the display screen 122.

It can be understood that the light guiding structure 144 can also be a columnar structure having a cross-sectional shape of an ellipse, a polygon, or the like, and is not limited to the embodiment. In addition, the light guiding structure 144 can also be a hollow tubular structure, and the outer side surface or the inner side surface thereof is disposed as a light reflecting surface, and the side surface of the tubular structure is provided with an optical opening, and the extending direction of the light emitting opening is corresponding to the border of the protective shell 124 corresponding thereto. The extension direction is parallel. Of course, the light guiding structure 144 can also be other structures, such as a side-emitting optical fiber structure. The light exiting portion of the light guiding structure 144 is not limited to the light exiting groove, and a light transmitting material or the like is provided at a position where light is required to be emitted.

The three reflectors 16 are respectively disposed on the other three frames 128, 130 and 132 of the protective cover 124, and the extending directions of the three reflectors 16 are parallel to the extending direction of the corresponding frame, that is, the three frames 128. The edges of the adjacent display screens 130, 132 and 132 are parallel. Preferably, the length of the three reflecting plates 16 is equal to or greater than the length of the edge of the corresponding display screen 122. As shown in FIG. 2, the three reflectors 16 are used to reflect the light emitted by the line source module 14 to the outside of the surface of the display screen 122, thereby forming a staggered light field 180 outside the surface of the display screen 122.

The image capturing module 18 is disposed on the protective cover 124 of the display panel 12 and located between the frame 126 and the frame 128. The image capturing module 18 captures the entire display screen 122, and the image capturing module 18 has a viewing end and a display. The vertical distance of the screen 122 is greater than the distance between the light field 180 and the display screen 122, so that the image capturing module 18 does not ingest the light emitted from the light exit slot 150 when no object interferes with the light field 180. Light reflected by the reflecting plate 16.

The touch control principle of the touch device 100 is as follows: the ingestion range of the image capturing module 18 is adjusted to be the entire display screen 122, and the coordinate position relationship between the display screen 122 and the ingestion range of the image capturing module 18 is determined. The point of the confirmed coordinate position at the four corners of the display screen 122 is compared with the ingestion range of the image capturing module 18 by a processing chip to determine the ingestion range of each point of the display screen 122 and the image capturing module 18. Coordinate positional relationship.

An object such as a finger touches the surface of the display screen 122, and the finger intersects the light field 180. At this time, the finger reflects the infrared light of the light field 180 to the image capturing module 18, and the image capturing module The relative position of the reflected light in the ingestion range of the image capturing module 18 is sensed, and then analyzed according to the coordinate position relationship between the points of the display screen 122 and the ingestion range of the image capturing module 18, and the finger is confirmed on the surface of the display screen 122. The coordinate position. The finger may not have to touch the display screen 122 as long as the finger can intersect the light field 180.

It can be understood that the image capturing module 18 in this embodiment can also be located at other locations, as long as its ingestion range covers the entire display screen 122, and is not limited to the embodiment.

As shown in FIG. 3, a second embodiment of the present invention provides a touch device 200. The touch device 200 of the present embodiment is similar to the touch device 100 of the first embodiment, except that the touch device 200 includes two image capturing modules 20 and 22. The two image capturing modules 20 and 22 are disposed on the protective cover 124. The image capturing module 20 is located between the frame 126 and the frame 128. The image capturing module 22 is located between the frame 126 and the frame 132. The viewing end of the 18 and the light field 180 are at the same distance from the surface of the display screen 122. Thus, the image capturing module 18 can pick up the light reflected by the three reflecting plates 16. The image capture modules 20 and 22 can each include a linear imager.

In this embodiment, when a touch object such as a finger approaches the display surface of the display screen 122, the finger intersects with the light field of the display surface of the display screen, and a portion of the light entering the image capturing modules 20 and 22 is intercepted by the finger. The image capturing modules 20 and 22 respectively capture an image corresponding to the light being intercepted by the finger, according to the angle between the connection between the finger and the image capturing module 20 and the optical axis of the image capturing module 20, and the finger and the finger The angle between the connection of the image capture module 22 and the optical axis of the image capture module 22 is calculated by the coordinates of the finger on the display screen.

The touch devices 100 and 200 of the embodiment of the present invention only need to have a line light source module, a reflection plate and an image capturing module on the outside of the display screen, and the structure and the process are relatively simple.

It can be understood that the touch device of the present invention can also be applied to other devices such as an electronic tablet that need to determine the coordinate position of the object, and is not limited to the display device of the embodiment of the present invention.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

100‧‧‧ touch device

12‧‧‧ display panel

122‧‧‧ display

124‧‧‧Protection shell

18‧‧‧Image Capture Module

14‧‧‧Line light source module

150‧‧‧Lighting trough

126,128,130,132‧‧‧Border

142‧‧‧Infrared point source

144‧‧‧Light guiding structure

148‧‧‧Light reflective layer

152‧‧‧Light Guide

146‧‧‧Into the glossy surface

16‧‧‧reflector

Claims (6)

A touch device includes a display screen, a line light source module, a reflector, and an image capture module. The line light source module is disposed along an edge of the display screen, and the line light source module includes a strip light exit port. The strip-shaped light-emitting port is configured to emit light, and the reflecting plate is disposed at a periphery of the display screen, and the light emitted from the strip-shaped light-emitting port is reflected by the reflecting plate to form a staggered light field on the surface of the display screen, and the image is taken up. The module is disposed between adjacent edges of the display screen, and the image capturing module is located on the same side of the display screen as the line light source module, and the vertical distance between the viewing end of the image capturing module and the display screen The image capturing module receives a range that is greater than the distance between the light field and the display screen. When an object intersects the light field, the image capturing module receives the object and reflects the light field. The light behind some of the light. The touch device of claim 1, wherein the line light source module comprises at least one light source and a light guiding structure, and one end surface of the light guiding structure is a light incident surface, and the point light source faces the light source The light-emitting surface is disposed on a side of the light guiding structure, and the strip-shaped light-emitting opening is parallel to an extending direction of the light guiding structure. The touch device of claim 2, wherein the point source is an infrared light emitting diode. The touch device of claim 2, wherein the outer surface of the light guiding structure is provided with a reflective layer except for the light incident surface and the strip light exit opening. The touch device of claim 2, wherein the light guiding junction Constructed as a fiber or a light pipe. The touch device of claim 1, wherein the reflector is disposed at another edge other than the edge of the line source module.