Touch assembly of single-layer ITO circuit and capacitive screen
By using the touch components of a single-layer ITO line in the sensor of a multi-touch capacitive touch screen, the high cost and complex process problems caused by the double-layer ITO conductive lines are solved, and the touch effect with lower cost and higher sensitivity is achieved.
Patent Information
- Application Number
- CN202510274786.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-10
- Publication Date
- 2025-05-30
AI Technical Summary
The sensors of existing multi-touch capacitive touch screens use double-layer ITO conductive lines, resulting in high material costs, many processing processes, high production costs and long cycles.
The touch control components of a single-layer ITO line are used to uniformly distribute the sending and receiving lines on the ITO bottom plate to form a zigzag-shaped folded line and lead it out to the external circuit through the silver wire to realize the touch function.
Reduces material and production costs, simplifies process flow, reduces production cycles, and improves touch sensitivity.
Smart Images
Figure CN120066321A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of touch screens, and particularly to a touch component with a single-layer ITO circuit and a capacitive screen. Background Art
[0002] The sensors of multi-touch capacitive touch screens (referred to as SENSOR in the industry and used hereinafter) generally adopt a double-layer indium tin oxide (ITO) conductive circuit design, which is made of double-sided ITO glass or two ITO conductive films processed by processes such as etching, printing, and laser. Since the SENSOR of this structure has two layers of ITO conductive circuits, the material cost is high, the processing procedures are numerous, the production cost is high, and the production cycle is long. Summary of the Invention
[0003] Based on this, it is necessary to provide a touch component with a single-layer ITO circuit and a capacitive screen for at least one of the above-mentioned problems.
[0004] In a first aspect, the present invention provides a touch component with a single-layer ITO circuit, which is connected to an external circuit. A plurality of touch areas covered by a transmitting circuit and a receiving circuit are evenly distributed on the single-layer ITO bottom plate. In each of the touch areas, both the transmitting circuit and the receiving circuit are zigzag broken-line circuits, and the transmitting circuit and the receiving circuit mesh but do not contact.
[0005] In some implementation manners of the first aspect, the ITO bottom plate includes a plurality of connection islands corresponding to the transmitting circuits one by one, and the connection islands are all arranged on one side of the ITO bottom plate and outside the window area of the ITO bottom plate.
[0006] Combining the first aspect and the above implementation manners, in some implementation manners of the first aspect, the material of the connection island includes silver.
[0007] Combining the first aspect and the above implementation manners, in some implementation manners of the first aspect, the convex height of the connection island is 6-10 μm.
[0008] Combining the first aspect and the above implementation manners, in some implementation manners of the first aspect, the receiving line is connected to the external line through a first silver wire, the transmitting line is connected to the connection island through a second silver wire, and the connection island is connected to the external line through a third silver wire; the widths of the first silver wire, the second silver wire, and the third silver wire are all greater than or equal to 0.2 mm, the spacing between adjacent two of the first silver wires and the spacing between adjacent two of the second silver wires are both greater than or equal to 0.2 mm, and the spacing between any two of the first silver wire, the second silver wire, and the third silver wire is greater than or equal to 0.3 mm; the printed thickness of the first silver wire, the second silver wire, and the third silver wire is 8-12 μm.
[0009] Combining the first aspect and the above implementation manners, in some implementation manners of the first aspect, a plurality of the touch areas are arranged in a touch column, and a grounded ground wire frame is distributed at the edge of each touch column; each touch column includes two rows of the receiving lines and several mutually independent transmitting lines, and the transmitting lines are arranged between the two rows of the receiving lines.
[0010] Combining the first aspect and the above implementation manners, in some implementation manners of the first aspect, an insulating oil layer covering the transmitting line and the receiving line is provided on the ITO bottom plate.
[0011] Combining the first aspect and the above implementation manners, in some implementation manners of the first aspect, the thickness of the insulating oil layer is 4-8 μm.
[0012] In a second aspect, the present invention provides a touch capacitive screen disposed on an external device, including a flexible circuit board and a touch component with a single-layer ITO circuit as described in any item of the first aspect of the present invention, and the flexible circuit board is respectively connected to the external device and the touch component with the single-layer ITO circuit.
[0013] In some implementation manners of the second aspect, the flexible circuit board is a single-layer flexible circuit board.
[0014] The technical solutions provided in the embodiments of the present invention bring the following beneficial technical effects:
[0015] The touch component with a single-layer ITO circuit provided by the present invention only requires a single-layer ITO film. The receiving lines and the transmitting lines are distributed in a zigzag manner and are all led out to the external circuit through silver wires. When a human hand presses on the staggered area, the finger forms a planar capacitor with the corresponding receiving line and transmitting line at the contact surface at the same time. The control circuit determines the touch position by detecting the change in the capacitance at this position, eliminating the disadvantages of high material cost and more processing procedures of the traditional capacitive screen using two layers of ITO conductive lines.
[0016] Additional aspects and advantages of the present application will be given in the subsequent parts, and will be understood in detail from the subsequent description, or learned through the specific implementation of the present invention. Description of the Drawings
[0017] Figure 1 It is a schematic circuit structure diagram of a touch component with a single-layer ITO circuit in an embodiment of the present invention;
[0018] Figure 2 It is a schematic circuit structure diagram of a part of the transmission lines and reception lines in an embodiment of the present invention;
[0019] Figure 3 It is a schematic partial circuit structure diagram of a touch component with a single-layer ITO circuit in an embodiment of the present invention;
[0020] Figure 4 It is a schematic circuit structure diagram of two touch columns in an embodiment of the present invention.
[0021] Description of the Reference Numerals:
[0022] 100 - ITO bottom plate, 200 - transmission line, 300 - reception line, 400 - connection island, 500 - external line, 600 - ground wire frame;
[0023] 110 - insulating oil layer;
[0024] 310 - first silver wire, 210 - second silver wire, 410 - third silver wire. Detailed Embodiments
[0025] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. The possible embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in the drawings herein. The embodiments described by referring to the drawings are exemplary and are used to make the understanding of the disclosure of the present invention more thorough and comprehensive, and cannot be construed as a limitation to the present invention. In addition, if the detailed description of the known technology is not necessary for the features of the present invention shown, these technical details may be omitted.
[0026] Those skilled in the relevant art can understand that unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the general understanding of those of ordinary skill in the technical field to which the present invention belongs. It should also be understood that those terms defined in general dictionaries should be understood as having meanings consistent with those in the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined as here.
[0027] It will be understood by those skilled in the art that, unless otherwise stated, the singular forms "a", "an", "said" and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present application refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that the term "and / or" used herein includes all or any unit and all combinations of one or more associated listed items.
[0028] The technical solution of the present invention and how the technical solution solves the above-mentioned technical problems are described in detail below with specific embodiments.
[0029] The embodiment of the first aspect of the present invention provides a touch control component of a single-layer ITO circuit, such as Figure 1 and Figure 2 As shown, connected to the external circuit 500, a plurality of touch control areas covered by the transmitting circuit 200 (TX) and the receiving circuit 300 (RX) are evenly distributed on the single-layer ITO substrate 100. In each touch control area, the transmitting circuit 200 and the receiving circuit 300 are both zigzag zigzag circuits, and the transmitting circuit 200 and the receiving circuit 300 are meshed but not in contact.
[0030] refer to Figure 1 and Figure 2 The transmitting line 200 and the receiving line 300 both include a lead portion and a bending portion, wherein the bending portions are interlaced with each other, and the specific shape of the bending portions is a rectangular tooth shape or a pointed tooth shape. The use of rectangular teeth and interlacing with each other can enable the transmitting line 200 and the receiving line 300 to cover a wider area of the ITO substrate 100, ensuring that the touch sensitivity of the capacitive screen is high. In addition, the ITO substrate 100 can be an ITO film or an ITO glass. The use of a single-layer ITO substrate 100 has a simple structure, a simple manufacturing process, lower material cost and production cost, and is more suitable for the promotion of industrialized capacitive touch screens.
[0031] The touch control component of the single-layer ITO circuit provided by the present invention only requires a single-layer ITO film. The receiving circuit 300 and the transmitting circuit 200 are staggered and distributed in a canine-tooth manner, and are both led out to the external circuit through silver wires. When a person presses on the staggered area, the finger on the contact surface and the corresponding receiving circuit 300 and transmitting circuit 200 simultaneously form a flat capacitor. The control circuit determines the touch position by detecting the change in capacitance at this position, eliminating the disadvantages of the traditional capacitive screen using two layers of ITO conductive circuits, such as high material cost and more processing steps.
[0032] Specifically, in some implementations of the first aspect of the embodiment, such as Figure 1 andFigure 2 As shown in the figure, on the ITO bottom plate 100, there are a number of connection islands 400 corresponding one by one to the transmission lines 200. The connection islands 400 are all arranged on one side of the ITO bottom plate 100 and are located outside the window area of the ITO bottom plate 100. Further specifically, the material of the connection islands 400 includes metallic silver, and is specifically made of a mixture such as metallic silver and adhesive. At this time, the connection islands 400 can be called conductive silver dots. Combining the embodiments of the first aspect and the above implementation, in some other implementations of the embodiments of the first aspect, the protruding height of the connection islands 400 is 6 - 10 μm. The connection islands 400 printed at each connection point are a kind of metallic silver with high conductivity. These connection islands 400 are arranged in the outer window area of the touch control component to facilitate the connection of each channel line and the ground wire. The printed height of the connection islands 400 is designed to be 8 ± 2 μm. In order to achieve a distribution effect of the transmission lines 200 and the receiving lines 300 that is as uniform and has a larger coverage area as possible, the connection islands 400 are located at the opposite ends of the ITO bottom plate 100, and the transmission lines 200 are back-to-back and located in the middle of two opposite receiving lines 300. For the specific appearance, refer to Figure 1 and Figure 3 .
[0033] Combining the embodiments of the first aspect and the above implementation, in some other implementations of the embodiments of the first aspect, as Figure 4 shown, the receiving line 300 is connected to the external line 500 through the first silver line 310, the transmission line 200 is connected to the connection island 400 through the second silver line 210, and the connection island 400 is connected to the external line 500 through the third silver line 410; the widths of the first silver line 310, the second silver line 210, and the third silver line 410 are all greater than or equal to 0.2 mm. The spacing between adjacent two first silver lines 310 and the spacing between adjacent two second silver lines 210 are both greater than or equal to 0.2 mm. The spacing between any two of the first silver line 310, the second silver line 210, and the third silver line 410 is greater than or equal to 0.3 mm; the printed thickness of the first silver line 310, the second silver line 210, and the third silver line 410 is 8 - 12 μm. The silver lines for connecting each external line 500 to each channel line and the ground wire are specifically formed on the insulating ink through printing and laser processing and are connected to the corresponding connection islands 400. Considering the adhesion of the silver lines on the insulating ink, the designed width of the silver lines is not less than 0.2 mm. The spacing between the silver lines (the second silver lines 210) of the transmission line 200 and the spacing between the silver lines (the first silver lines 310) of the receiving line 300 shall not be less than 0.2 mm. The spacing between the silver lines of the transmission line 200, the silver lines of the receiving line 300, and the ground wire shall not be less than 0.3 mm. The printed thickness of the silver lines is 10 ± 2 μm.
[0034] Referring to the figure, in some other embodiments of the first aspect of the present invention, as Figure 3As shown, several touch areas are arranged in a touch column, and a grounded ground wire frame 600 is distributed at the edge of each touch column; each touch column includes two rows of receiving lines 300 and several independent transmitting lines 200, and the transmitting lines 200 are arranged between the two rows of receiving lines 300. Structurally, the transmitting lines 200 and the receiving lines 300 are interlaced like canine teeth and are surrounded by the surrounding ground wire frames 600 to eliminate external electromagnetic interference of each touch column. The transmitting lines 200 and the receiving lines 300 are both led out to an external circuit through silver wires connecting to the external lines 500. The transmitting lines 200, the receiving lines 300, and the ground wire lines are ITO lines processed on ITO glass or ITO film with a sheet resistance not higher than 100 Ω, and the lines are conductive through ITO.
[0035] Combined with the first aspect and the above implementation, in some implementations of the first aspect, an insulating oil layer 110 covering the transmitting lines 200 and the receiving lines 300 is provided on the ITO bottom plate 100. To avoid short circuits between the ITO lines of TX, RX, and the ground wire and the silver wires (the first silver wire 310, the second silver wire 210, the third silver wire 410, etc.), insulating oil is provided between them for isolation, that is, an insulating oil layer 110 is provided on the ITO lines, and connection ports for each TX channel line, each RX channel line, and the ground wire are left on the insulating oil layer 110 so that each channel line and the ground wire can be connected to the corresponding silver wires connecting to the external lines 500. To prevent the silver wires connecting to the external lines 500 from being oxidized, a layer of insulating ink is covered on the silver wires.
[0036] Combined with the first aspect and the above implementation, in some implementations of the first aspect, the thickness of the insulating oil layer 110 is 4 - 8 μm. The insulating ink isolating the ITO lines is arranged outside the window and covers the ITO lines in this area except for the connection islands 400. Considering the printing deviation between the connection islands 400 and the insulating ink, a gap of 0.05 mm is designed between them. Also considering the effective connection between the connection islands 400 and the silver wires connecting to the external lines 500 and the insulating performance of the insulating ink, the printing thickness of the insulating ink is designed to be 6 ± 2 μm.
[0037] In a second aspect, the present invention provides a capacitive touch screen provided on an external device, including a flexible printed circuit board and a touch component with a single-layer ITO line as described in any one of the first aspects of the present invention, and the flexible printed circuit board is respectively connected to the external device and the touch component with the single-layer ITO line.
[0038] In some implementations of the second aspect, the flexible printed circuit board is a single-layer flexible printed circuit board.
[0039] After testing, the capacitive touch screen provided by the present invention has the following technical parameters:
[0040]
[0041]
[0042] Those skilled in the art can understand that the terms "first" and "second" discussed in this application are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, unless otherwise specified, the meaning of "a plurality" is two or more.
[0043] In the description of this application, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected" and "coupled" shall be construed broadly. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0044] In the description of this specification, specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner.
[0045] The above are only some embodiments of this application. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of this application, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of this application.
Claims
1. A single-layer ITO circuit touch control component connected to an external circuit, characterized in that: A plurality of touch control areas covered by transmission lines and receiving lines are evenly distributed on a single-layer ITO substrate. In each of the touch control areas, the transmission lines and the receiving lines both include zigzag fold line lines, and the transmission lines and the receiving lines are meshed but not in contact.
2. The single-layer ITO circuit touch control component according to claim 1, characterized in that: The ITO base plate includes a plurality of connection islands corresponding to the transmission lines one by one, and the connection islands are all arranged on one side of the ITO base plate and outside the window area of the ITO base plate.
3. The touch control component of the single-layer ITO circuit according to claim 2, characterized in that: The material of the connecting island includes metal silver.
4. The touch control component of the single-layer ITO circuit according to claim 2, characterized in that: The protrusion height of the connecting island is 6-10 μm.
5. The single-layer ITO circuit touch control component according to claim 2, characterized in that: The receiving circuit is connected to the external circuit through a first silver wire, the sending circuit is connected to the connection island through a second silver wire, and the connection island is connected to the external circuit through a third silver wire; the width of the first silver wire, the second silver wire and the third silver wire are all greater than or equal to 0.2 mm, the spacing between two adjacent first silver wires and the spacing between two adjacent second silver wires are both greater than or equal to 0.2 mm, and the spacing between the first silver wire, the second silver wire and the third silver wire is greater than or equal to 0.3 mm; the printing thickness of the first silver wire, the second silver wire and the third silver wire is 8 to 12 μm.
6. The single-layer ITO circuit touch control component according to claim 1, characterized in that: A plurality of the touch control areas are arranged into a touch control row, and a ground wire frame is distributed at the edge of each of the touch control rows; each of the touch control rows includes two rows of the receiving circuits and a plurality of sections of the transmitting circuits that are independent of each other, and the transmitting circuit is arranged between the two rows of the receiving circuits.
7. The single-layer ITO circuit touch control component according to claim 1, characterized in that: An insulating oil layer covering the sending circuit and the receiving circuit is arranged on the ITO bottom plate.
8. The touch control component of the single-layer ITO circuit according to claim 7, characterized in that: The thickness of the insulating oil layer is 4-8 μm.
9. A touch capacitive screen, arranged on an external device, characterized in that: The invention comprises a flexible circuit board and a touch control component of a single-layer ITO circuit as described in any one of claims 1 to 8, wherein the flexible circuit board is connected to the external device and the touch control component of the single-layer ITO circuit respectively.
10. The capacitive touch screen according to claim 9, characterized in that: The flexible circuit board is a single-layer flexible circuit board.