CN101452362B - Touch panel and manufacturing method thereof - Google Patents

Abstract

The present invention discloses a touch panel, which includes a substrate, a conductive circuit layer, a resistor layer and a dielectric layer. The substrate has a touch area and a peripheral area, the conductive circuit layer is formed on the peripheral area of the substrate, and then the resistor layer covers the conductive circuit layer and the touch area of the substrate, and then the dielectric layer is formed on the resistor layer. The conductive circuit layer also includes a plurality of signal terminals, which are arranged at the corners of the substrate and are corner electrodes of the conductive circuit layer.

Description

Touch panel and manufacturing method thereof

technical field

The invention relates to a touch screen, its panel and a manufacturing method, in particular to a touch panel and a touch screen in which an anti-reflection layer is formed on a resistance layer. the

Background technique

In recent years, touch panels have been widely used in general consumer electronics, such as mobile communication devices, digital cameras, digital music players (MP3), personal digital assistants (PDA), satellite navigation devices (GPS), Hand-held PCs (hand-held PCs), and even new ultra-mobile PCs (Ultra Mobile PC, UMPC), etc., the above-mentioned touch panels are all combined with display screens to become touch screens. For touch screens, sensitivity and accuracy are very important, and affect the performance of the product, and the process of the touch panel also affects the cost. the

A known touch screen 1 is shown in FIG. 1 , and its partial cross-sectional view is shown in FIG. 2 . The touch screen 1 includes a touch panel 11 and external circuits 12 . The touch panel 11 includes a substrate 111 , a resistive layer 112 , a conductive circuit layer 113 , a plurality of signal terminals 114 and a protective layer 116 . The substrate 111 has a touch area T1 and a peripheral area P1, and the peripheral area P1 is arranged around the touch area T1. The resistance layer 112 is formed on the touch area T1 and the peripheral area P1 of the substrate 111 . The conductive circuit layer 113 and the signal terminal 114 are formed on the resistance layer 112 in the peripheral area P1. The protection layer 116 covers the conductive circuit layer 113 and the signal terminal 114 to achieve protection. The external circuit 12 is electrically connected to the signal terminal 114 . the

The operating principle of the touch screen 1 is as follows: when the signal terminal 114 is charged, the entire resistive layer 112 will generate an electric field distributed along the equipotential line L1, and the distribution of the equipotential line is shown in FIG. 3 . When the user presses a certain position on the resistive layer 112, the electric field of the resistive layer 112 will change, and the signal terminals 114 located at the four corners will generate signals according to the current change, and transmit them to the backend through the external circuit 12 for signal processing , to know the user's pressing position. the

However, as shown in FIG. 2 , the conductive circuit layer 113 is only in contact with the resistive layer 112 through the bottom surface A1, so that the amount of current transmitted from the conductive circuit layer 113 to the resistive layer 112 is limited, thereby reducing the potential of the electric field generated by the resistive layer 112, And reduce the sensitivity of the touch screen 1 . In addition, as shown in FIG. 3, due to the above reasons, the equipotential line L1 formed on the resistive layer 112 will be seriously bent at the end E1, thereby reducing the accuracy of the touch screen 1. the

Contents of the invention

In view of the above problems, the object of the present invention is to provide a touch panel and a touch screen that can improve sensitivity and accuracy, simplify the process, improve the use efficiency and reduce the cost. the

To achieve the above purpose, the present invention proposes a touch panel including a substrate, a conductive circuit layer, a resistive layer and a dielectric layer. The substrate has a touch area and a peripheral area, a conductive circuit layer is formed on the peripheral area of the substrate, and then a resistive layer covers the conductive circuit layer and the touch area of the substrate, and then a dielectric layer is formed on the resistive layer. The conductive circuit layer further includes a plurality of signal terminals disposed at the corners of the substrate, which are corner electrodes of the conductive circuit layer, and are used to apply voltage and receive current to the touch panel. . the

To achieve the above purpose, a touch screen of the present invention includes a touch panel and external circuits. The touch panel includes a substrate, a conductive circuit layer, a resistive layer and a dielectric layer. The substrate has a touch area and a peripheral area, a conductive circuit layer is formed on the peripheral area of the substrate, and then a resistive layer covers the conductive circuit layer and the touch area of the substrate, and then a dielectric layer is formed on the resistive layer. The conductive circuit layer further includes a plurality of signal terminals disposed at the corners of the substrate, which are corner electrodes of the conductive circuit layer and electrically connected with external circuits for applying voltage and receiving current to the touch panel. the

As mentioned above, the touch panel and touch screen of the present invention form the conductive circuit layer on the substrate, and then form the resistive layer on the conductive circuit layer, so the conductive circuit layer and the resistive layer can form multi-faceted contact, thus increasing The amount of current conducted increases sensitivity and accuracy. In addition, since the dielectric layer is formed on the resistive layer, the resistive layer and the dielectric layer can be completed by entering and exiting the coating equipment once in the process, thereby simplifying the process, improving the use efficiency and reducing the cost. the

Description of drawings

Fig. 1 is a schematic diagram of a known touch screen;

FIG. 2 is a partial cross-sectional view of the touch screen of FIG. 1;

3 is a schematic diagram of the distribution of equipotential lines of the touch screen of FIG. 1;

Fig. 4 is the schematic diagram of a kind of touch screen of preferred embodiment of the present invention;

Fig. 5 is a partial sectional view of the touch screen of Fig. 4;

Fig. 6 is a partial cross-sectional view of another touch screen of the present invention; and

FIG. 7 is a schematic diagram of the distribution of equipotential lines of the touch screen in FIG. 4 . the

Explanation of reference signs

1, 2, 2′: touch screen

11, 21: Touch panel

111, 211: Substrate

112, 212: resistance layer

113, 213: Conductive circuit layer

114, 214: signal terminal

215, 215': dielectric layer

116, 216: protective layer

12, 22: external lines

A1: bottom surface

A21: top surface

A22, A23: side

E1: end

L1, L2: equipotential lines

P1, P2: Surrounding area

T1, T2: touch area

Detailed ways

A touch panel and a touch screen according to preferred embodiments of the present invention will be described below with reference to related drawings. The same elements will be denoted by the same symbols. the

FIG. 4 shows a touch screen 2 according to a preferred embodiment of the present invention, and its partial cross-sectional view is shown in FIG. 5 . The touch screen 2 includes a touch panel 21 and external circuits 22 . The touch panel 21 includes a substrate 211 , a conductive circuit layer 213 , a resistive layer 212 , a dielectric layer 215 and a protective layer 216 . the

The substrate 211 has a touch area T2 and a peripheral area P2, and the peripheral area P2 is arranged around the touch area T2. The substrate 211 is for example but not limited to a glass substrate or a plastic substrate. The conductive circuit layer 32 can be formed on the peripheral area P2 of the substrate 211 by coating, printing, bonding or coating, and can form discontinuous electrodes as shown by the dotted lines in FIG. 4 . The material of the conductive circuit layer 213 is, for example, copper or silver glue. the

The conductive circuit layer 213 also includes a plurality of signal terminals 214, which are arranged at the corners of the substrate 211, and are corner electrodes (corner electrodes) of the conductive circuit layer 213, which apply voltage and receive current to the touch panel 2, and simultaneously with the conductive circuit layer 213 form. The external circuit 22 is electrically connected to the signal terminal 214 . the

The resistance layer 212 covers the conductive circuit layer 213 and the touch area T2 of the substrate 21 . The material of the resistance layer 212 can be a transparent conductive metal oxide, such as indium tin oxide (ITO), indium zinc oxide (IZO), aluminum zinc oxide (AZO), gallium zinc oxide (GZO) or zinc oxide ( ZnO). the

Next, a dielectric layer 215 is formed on the resistive layer 212 . The dielectric layer 215 can include at least one hardening layer and/or at least one anti-reflection layer, and the hardening layer can be formed first and then the anti-reflection layer; or the anti-reflection layer can be formed first and then the hardening layer can be formed. The material of the anti-reflection layer is, for example, silicon oxide (SiO), silicon nitride (SiN) or silicon oxynitride (SiON). It is worth mentioning that the resistive layer 212 and the dielectric layer 215 can be completed by entering and exiting the coating equipment at one time to simplify the process. the

In addition, FIG. 6 shows another variation of the arrangement of the dielectric layer. The dielectric layer 215' of the touch screen 2' is mainly formed on the resistive layer 212 located in the touch area T2. the

Then, a protective layer 216 is formed on the dielectric layer 215 in the peripheral region P2 (as shown in FIG. 5 ) or on the resistive layer 212 in the peripheral region P2 (as shown in FIG. 6 ), and its material is, for example, epoxy resin (epoxy). Or silica gel (silicon). The protective layer 216 can protect the conductive circuit layer 213 and the signal terminal 214 . the

When the signal terminal 214 is charged, the entire resistive layer 212 will generate an electric field distributed along the equipotential line L2, and the distribution of the equipotential line L2 is shown in FIG. 7 . When the user presses one of the positions of the lower touch area T2, the electric field of the resistive layer 212 will change, and the signal terminal 214 located at the corner will generate a signal according to the current change, and transmit and process the signal through the external circuit 22, so as to Know the user's pressing position. The external circuit 22 may include, for example, wires, cables and chips. the

As shown in FIG. 5 , the contact surface between the conductive circuit layer 213 and the resistive layer 212 includes two side surfaces A22 and A23 in addition to the top surface A21 . Compared with the known technology, the present invention can increase the amount of current conducted and increase the potential of the electric field formed by the conductive circuit layer 213 . In addition, as shown in FIG. 7 , due to the above reasons, the end of the equipotential line L2 formed on the resistive layer 212 is less curved than known ones, thereby improving the accuracy of the touch screen 2 . the

In summary, according to the touch panel and touch screen of the present invention, the conductive circuit layer is disposed on the substrate, and then the resistive layer is formed on the conductive circuit layer, so the conductive circuit layer can form multi-faceted contact with the resistive layer, thus Increase the amount of current conducted, improving sensitivity and accuracy. In addition, since the dielectric layer is formed on the resistive layer, the resistive layer and the dielectric layer can be completed by entering and exiting the coating equipment once in the process, thereby simplifying the process, improving the use efficiency and reducing the cost. the

The above descriptions are illustrative only, not restrictive. Any equivalent modifications or changes made without departing from the spirit and scope of the present invention shall be included in the appended claims. the

Claims (18)

1. A touch panel, comprising: The substrate has a touch area and a peripheral area; a conductive circuit layer formed on the peripheral region of the substrate; a resistive layer formed on the conductive circuit layer and the touch area of the substrate; and The dielectric layer is formed on the resistance layer or on the resistance layer of the touch area. 2 . The touch panel as claimed in claim 1 , wherein the conductive circuit layer further comprises a plurality of signal terminals disposed at corners of the substrate, which are corner electrodes of the conductive circuit layer. 3. The touch panel as claimed in claim 2, further comprising an external circuit electrically connected to the plurality of signal terminals for applying voltage and receiving current to the touch panel, wherein the external circuit comprises wiring, Cables and chips. 4. The touch panel as claimed in claim 1, wherein the substrate is a glass substrate or a plastic substrate. 5. The touch panel as claimed in claim 1, wherein the conductive circuit layer is made of copper or silver glue. 6. The touch panel as claimed in claim 1, wherein the conductive circuit layer is a discontinuous electrode. 7. The touch panel as claimed in claim 1, wherein the material of the resistive layer is a transparent conductive metal oxide. 8. The touch panel as claimed in claim 7, wherein the material of the resistive layer is Indium Tin Oxide, Indium Zinc Oxide, AlZnO, GaZnO or ZnO. 9. The touch panel as claimed in claim 1, wherein the dielectric layer comprises at least one anti-reflection layer and/or at least one hardening layer. 10. The touch panel as claimed in claim 9, wherein the material of the anti-reflection layer is silicon oxide, silicon nitride or silicon oxynitride. 11. The touch panel of claim 1, further comprising: a protective layer formed on the dielectric layer in the peripheral region or on the resistive layer in the peripheral region, 12. The touch panel as claimed in claim 1, wherein the protective layer is made of epoxy resin or silicone. 13. A method for manufacturing a touch panel, comprising: providing a substrate having a touch area and a peripheral area; forming a conductive circuit layer on the peripheral area of the substrate; forming a resistive layer on the conductive circuit layer and the touch area of the substrate; and A dielectric layer is formed on the resistance layer or on the resistance layer of the touch area. 14. The manufacturing method of the touch panel as claimed in claim 13, wherein the conductive circuit layer is a discontinuous electrode, and the conductive circuit layer further includes a plurality of signal terminals, which are arranged at the corners of the substrate and are the electrodes of the conductive circuit layer. corner electrodes. 15. The manufacturing method of the touch panel according to claim 13, wherein the conductive circuit layer is formed on the substrate by coating, printing, bonding or coating. 16. The manufacturing method of the touch panel according to claim 13, wherein the dielectric layer comprises at least one anti-reflection layer and/or at least one hardening layer, and the material of the anti-reflection layer is silicon oxide, silicon nitride or nitrogen silicon oxide. 17. The manufacturing method of the touch panel as claimed in claim 13, further comprising forming a protection layer on the dielectric layer in the peripheral region or on the resistance layer in the peripheral region, wherein the material of the protection layer is ring epoxy or silicone. 18. The manufacturing method of the touch panel as claimed in claim 13, wherein the step of forming the resistive layer and the step of forming the dielectric layer are completed by entering and exiting the coating equipment once.

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