CN102819360B - Capacitance touch screen and there is the contactor control device of this capacitance touch screen - Google Patents

Abstract

The invention discloses a capacitive touch screen, comprising: a transparent substrate; a plurality of first components parallel to each other, the plurality of first components are formed on the transparent substrate; a plurality of second components spaced apart from each other, the plurality of a second part is formed above the first part, and the second part forms a first predetermined angle with the first part; The two parts are located on the same plane, and each group of third parts is connected to one of the plurality of second parts and arranged at intervals, wherein two adjacent second parts correspond to two groups of third parts Interleaved with each other. The invention also discloses a touch control device with the capacitive touch screen. The present invention can increase the sensing range of the excitation part and the detection part by adopting the branch interlaced structure, and more precisely locate the touch point. In the actual product manufacturing process, the cost can be reduced and the product performance can be improved.

Description

Capacitive touch screen and touch device with the capacitive touch screen

technical field

The invention relates to the technical field of touch control, in particular to an improved capacitive touch screen and a touch device with the capacitive touch screen.

Background technique

The touch screen has been widely used in various electronic products due to its small mechanical loss and small size. Common touch screens have self-capacitance and mutual-capacitance printed circuit board structures. Self-capacitance can only achieve single-point touch, if double-point touch will produce ghost points. Therefore, the application of the mutual capacitance printed circuit board structure is more extensive.

FIG. 1 is a plan view of a conventional mutual-capacitance printed circuit board structure with a double-layer structure. The vertical black bar is the capacitive signal detection terminal 200' on the top layer, and the horizontal one is the excitation signal supply terminal 100', and the two are perpendicular to each other. When the touch object (such as a finger) does not touch the screen, the excitation terminal 100' mainly absorbs the negative charge of the detection terminal 200', and the capacitance value formed by the two is C1. When a touch object (such as a finger) touches the screen, since a large part of the excitation signal supply terminal 100' is far away from the signal detection terminal 200' and the finger is close, it will in turn absorb the negative charge on the finger and absorb the signal detection accordingly. The charges at the terminal 200' will decrease, so the mutual capacitance formed between the signal detection terminal 200' and the excitation signal supply terminal 100' will decrease. By detecting the magnitude of the mutual capacitance change through the corresponding detection circuit, it can be judged whether the contact is an effective contact, and the coordinates of the finger on the screen can be calculated through the corresponding calculation method to realize positioning.

There is such a problem in the arrangement of the signal detection end and the excitation signal supply end of the existing mutual capacitive touch screen: when the touch object (such as a finger) is between the two signal detection ends, or when only close to one of the excitation signal supply ends, Another excitation signal supply end will only have a slight induction, so the induction signal will not form a stable and accurate linear change, resulting in positioning errors.

Contents of the invention

The purpose of the present invention is to solve at least one of the above-mentioned technical drawbacks.

In order to achieve the above object, the first aspect of the present invention proposes a capacitive touch screen, comprising: a transparent substrate; a plurality of first components parallel to each other, the plurality of first components are formed on the transparent substrate; a plurality of mutually spaced A second part, the plurality of second parts is formed above the first part, and the second part forms a first predetermined angle with the first part; and a plurality of sets of third parts, the plurality of groups of third parts The components are located on the same plane as the plurality of second components, and each group of third components is connected to one of the plurality of second components and arranged at intervals from each other, wherein two adjacent second components correspond to The two groups of third components are arranged alternately with each other.

The capacitive touch screen of the embodiment of the present invention can increase the sensing range of the excitation component and the detection component by adopting a branched and interleaved structure, which is more conducive to precise positioning of the touch point. In the actual product manufacturing process, it can reduce costs and improve product performance.

The second aspect of the present invention provides a touch device, including: a touch screen, the touch screen is the capacitive touch screen according to the first aspect; a first I/O interface group, each of the first I/O interface group An I/O interface is connected to one of the first components; a second I/O interface group, each I/O interface in the second I/O interface group is connected to one of the second components; and the control device, the controller is respectively connected to the first I/O interface group and the second I/O interface group, and detects that the touch screen is touched according to the change in capacitance between the first component and the second component s position.

The touch device of the embodiment of the present invention adopts the capacitive touch screen with the above-mentioned staggered structure, which increases the detection area for detecting the change of the mutual capacitance between the first component and the second component, and improves the detection accuracy and detection range of the touch device. In addition, the entire screen can be widened when the number of chip I/O interfaces is the same, or the number of connected I/O interfaces can be reduced under the same screen specifications, thereby reducing production costs.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and easy to understand from the following description of the embodiments in conjunction with the accompanying drawings, wherein:

Fig. 1 is the plan view of the mutual capacitance type printed circuit board structure of existing double-layer structure;

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

Fig. 3 is a schematic diagram of a capacitive touch screen with floating islands according to an embodiment of the present invention; and

FIG. 4 is a schematic structural diagram of a touch device according to an embodiment of the present invention.

detailed description

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

In describing the present invention, it should be understood that the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", The orientation or positional relationship indicated by "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than Nothing indicating or implying that a referenced device or element must have a particular orientation, be constructed, and operate in a particular orientation should therefore not be construed as limiting the invention.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be two The internal communication of each element may be directly connected or indirectly connected through an intermediary. Those skilled in the art can understand the specific meanings of the above terms according to specific situations.

A capacitive touch screen according to an embodiment of the present invention includes a transparent substrate, a plurality of first components parallel to each other, a plurality of second components spaced apart from each other, and a plurality of groups of third components. A plurality of first components are formed on the transparent substrate. A plurality of second components are formed above the first component, and the second component forms a first predetermined angle with the first component and is spaced a predetermined distance from the first component, so that insulation between the first component and the second component can be realized. Multiple sets of third components are located on the same plane as multiple second components, and each set of third components is connected to one of the multiple second components, and multiple sets of third components are arranged at equal intervals, wherein two adjacent The two groups of third components corresponding to each second component are alternately arranged with each other.

In an example of the present invention, the first predetermined angle may be 90 degrees, that is, the second component and the first component are vertically arranged.

It should be noted that the first component is the excitation component, and the second component is the detection component, that is, the transparent substrate covers the excitation terminal, and the detection terminal is above the excitation terminal.

The capacitive touch screen 1 according to the embodiment of the present invention will be described below with reference to FIGS. 2 and 3 .

As shown in FIG. 2 , the capacitive touch screen 1 according to the embodiment of the present invention includes a plurality of first parts 100 parallel to each other, a plurality of second parts 200 spaced apart from each other and a plurality of groups of third parts 300, wherein one second part 200 A plurality of connected third components 300 is called a group of third components 300 . The multiple sets of third components 300 are located on the same plane as the multiple second components 200 , and the multiple sets of third components 300 are arranged at intervals from each other, and the two sets of third components 300 corresponding to adjacent second components 200 are alternately arranged with each other. Therefore, through the staggered structure, the sensing range of the excitation component and the detection component can be increased, no matter which part of the detection component is touched, there will be a corresponding induction, and the sensed signal will have precise magnitude changes.

In addition, in the case of the same number of I/O ports, if the present invention is adopted, the distance between the two detection components can be doubled, and the width of the screen can be doubled. Therefore, in the actual product manufacturing process, the production cost can be reduced to a certain extent.

In one embodiment of the present invention, the third component 300 includes a first branch 310 and a plurality of second branches 320 . The first branch 310 is connected to the second component 200, and the first branch 310 forms a second predetermined angle with the second component 200, wherein the second predetermined angle may be 90 degrees or any acute angle. The plurality of second branches 320 are connected to the first branches 310 respectively, and the plurality of second branches 320 are arranged at intervals with each other. Therefore, by providing a plurality of second branches 320, the area where the detection component receives the excitation signal can be increased, and the strength of the signal under test can be increased, which is beneficial to the detection of the touch point.

It should be understood that the lengths of the plurality of second branches 320 may be the same or different, for example, the length of the second branches 320 closer to the second component 200 among the plurality of second branches 320 may be greater.

According to the above-mentioned embodiment, specifically, the first branches 310 in one group of third parts 300 in the adjacent two groups of third parts 300 are interlaced with the first branches 310 in the other group of third parts 300 .

FIG. 3 is a partial schematic diagram of a capacitive touch screen with floating islands according to an embodiment of the present invention. At least one floating island structure 400 is provided between two first branches 310 interlaced with each other. The floating island structure 400 is a conductive material such as ITO. When the distance between the detection part and the excitation part is constant, the floating island structure 400 is like a bridge between the detection part and the excitation part, and the bridging through the floating island structure 400 is actually equivalent to shortening the distance between the detection part and the excitation part. The distance between them makes the initial mutual capacitance value between the detection part and the excitation part increase, thereby providing the mutual capacitance change after touching, and making it a stable and accurate linear change, which is convenient for detection and improves the accuracy of judgment.

It should be understood that one floating island structure 400 may be provided between the two first branches 310, or multiple floating island structures 400 may be provided, and the multiple floating island structures 400 may be vertically stacked and relatively There is a predetermined interval between two adjacent floating island structures. Of course, the plurality of floating island structures 400 can also be arranged in other spatial arrangements. By adjusting the size of the floating island structure 400, or adjusting the distance between multiple floating island structures 400, the range of mutual capacitance variation after touching can be adjusted, making it more convenient for detection.

The following describes a touch device according to an embodiment of the present invention with reference to FIG. 4 .

As shown in FIG. 4 , the touch device according to the embodiment of the present invention includes the capacitive touch screen 1 provided by the above-mentioned embodiments of the present invention, the first I/O interface group 2, the second I/O interface group 3 and the controller 4, wherein Each I/O interface in the first I/O interface group 2 is connected to a first component 100, and each I/O interface in the second I/O interface group 3 is connected to a second component 200, and the controller 4 are connected to the first I/O interface group 2 and the second I/O interface group 3 respectively, and detect the touched position of the touch screen according to the variation of the mutual capacitance between the first component 100 and the second component 200 .

When a touching object (such as a finger) is close to the capacitive touch screen 1, the first component 100 will absorb part of the negative charge on the finger, so the charge absorbed by the second component 200 will decrease accordingly, so that the first component 100 and the second component 200 The mutual capacitance between them decreases. The controller 4 collects the charge of the first component 100 and the second component 200 through the first I/O interface group 2 and the second I/O interface group 3, and calculates the mutual capacitance between the first component 100 and the second component 200 The change amount of the mutual capacitance, and then the touch point and touch action of the touch object can be calculated according to the change amount of the mutual capacitance. Since the floating island structure 400 of conductive material is added between the first component 100 and the second component 200, the distance between the first component 100 and the second component 200 is actually reduced, making the initial mutual capacitance value larger, Therefore, the amount of change in capacitance value after touch is increased, and the detection area for the controller 4 to detect the change amount of mutual capacitance is also widened.

According to the touch device of the embodiment of the present invention, due to the addition of the floating island structure, the distance between the first component and the second component in the capacitive touch screen is reduced, thereby increasing the detection of changes in the mutual capacitance of the first component and the second component The detection area improves the detection accuracy and detection range of the touch device.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (7)

1. A capacitive touch screen, characterized in that, comprising: transparent substrate; a plurality of first components parallel to each other, the plurality of first components are formed on the transparent substrate; a plurality of spaced-apart second members formed above the first member at a first predetermined angle from the first member and spaced apart from the first member a predetermined distance; and Multiple sets of third components, the multiple sets of third components are located on the same plane as the multiple second components, and each set of third components is connected to one of the multiple second components and arranged at intervals from each other , Wherein, the two groups of third parts corresponding to two adjacent second parts are alternately arranged with each other; the third parts include: a first branch connected to the second member at a second predetermined angle to the second member; and A plurality of second branches, the plurality of second branches are respectively connected to the first branches, and the plurality of second branches are arranged at intervals from each other. 2. The capacitive touch screen according to claim 1, characterized in that the first branches in one group of third parts in the adjacent two groups of third parts and the first branches in the other group of third parts are interlaced with each other . 3 . The capacitive touch screen according to claim 2 , wherein at least one floating island structure is further provided between the two first branches interlaced with each other. 4 . 4. The capacitive touch screen according to claim 3, wherein the floating island structure comprises conductive material. 5. The capacitive touch screen according to claim 1, wherein the first component is an excitation component, and the second component is a detection component. 6. The capacitive touch screen according to claim 1, wherein the first component and the second component are perpendicular to each other. 7. A touch device, characterized in that it comprises: A touch screen, the touch screen is a capacitive touch screen according to any one of claims 1-6; A first I/O interface group, each I/O interface in the first I/O interface group is connected to one of the first components; a second I/O interface group, each I/O interface in the second I/O interface group is connected to one of the second components; and a controller, the controller is respectively connected to the first I/O interface group and the second I/O interface group, and detects the The position where the touch screen was touched.