TWI727599B - Touch panel and method for making same - Google Patents

Abstract

A touch panel and a method for making the touch panel are provided. The touch panel includes a first base film, a first matching layer and a first electrode layer on the first base film, wherein the first matching layer is located between the first base film and the first electrode layer and is a zirconia layer; a second base film on a side of the first base film away from the first matching layer; and a second matching layer and a second electrode layer on the second base film adjacent to the first base film side, wherein the second matching layer is located between the second base film and the second electrode layer. The second matching layer is a silicon dioxide layer or a zirconia layer, and the first electrode layer and the second electrode layer form touch sensing electrodes and touch driving electrodes of the touch panel respectively. The touch panel has good resistance to falling.

Description

Touch panel and preparation method thereof

The invention belongs to the touch field, and relates to a touch panel and a preparation method thereof.

The existing touch panel includes a sensing electrode and a driving electrode. The driving electrode and the sensing electrode each include a matching (Index Matching, IM) layer. Currently, the matching layer in the driving electrode and the sensing electrode is silicon dioxide. After a large number of ball drop tests on the touch panel, it is found that the sensing electrode is often damaged, which affects the electrical performance of the touch panel, which greatly affects the yield and quality of the product.

The first aspect of the present invention provides a touch panel, including: a first base film; a first matching layer and a first electrode layer formed on the first base film, and the first matching layer is located on the first base film; A zirconia layer between the base film and the first electrode layer; a second base film located on the side of the first base film away from the first matching layer; and formed on the second base film The second matching layer and the second electrode layer on the side close to the first base film, the second matching layer is located between the second base film and the second electrode layer, the second matching layer It is a silicon dioxide layer or a zirconium oxide layer, and the first electrode layer and the second electrode layer respectively form touch sensing electrodes and touch driving electrodes of the touch panel.

A second aspect of the present invention provides a method for manufacturing a touch panel, including: providing a first base film, on which a first matching layer and a first electrode layer are sequentially formed on the first base film, and the first The matching layer is a zirconia layer; a second base film is provided, and a stacked second matching layer and a second electrode layer are sequentially formed on the side of the second base film close to the first base film. The matching layer is a silicon dioxide layer Or a zirconium oxide layer; connecting the second base film and the first base film so that the second base film is located on the side of the first base film away from the first matching layer; the first electrode layer and The second electrode layers are respectively formed as touch sensing electrodes and touch driving electrodes.

In the above touch panel, the first matching layer made of zirconia is provided on the touch sensing electrode to improve the toughness and hardness of the touch sensing electrode, which greatly improves the probability and touch of the touch panel through the falling ball test. The panel's anti-fall ability has significant advantages.

100: Touch panel

200: electronic device

12: The first basement membrane

14: The first matching layer

16: first electrode layer

22: second basement membrane

24: The second matching layer

26: second electrode layer

30: cover

40: Optically transparent conductive adhesive layer

50: The first strip electrode

60: The second strip electrode

FIG. 1 is a schematic diagram of a touch panel according to an embodiment of the present invention.

2 is a schematic cross-sectional view of a touch panel according to an embodiment of the invention.

Fig. 3 is a partial enlarged schematic view of the section III of Fig. 2.

Fig. 4 is a schematic diagram of a falling ball test according to the first embodiment of the present invention.

FIG. 5 is a schematic diagram of a strip electrode of a first electrode layer according to an embodiment of the present invention.

FIG. 6 is a schematic diagram of a strip electrode of a second electrode layer according to the first embodiment of the present invention.

In order to be able to understand the above objectives, features and advantages of the present invention more clearly, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that in the following description, many specific details are set forth in order to fully understand the present invention, and the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present invention. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments, and are not intended to limit the present invention.

The first embodiment

Referring to FIG. 1, this embodiment provides a touch panel 100 applied to an electronic device 200. As shown in FIG. 2, the touch panel 100 includes: a first base film 12, a first matching layer 14 formed on the first base film 12, a patterned first electrode layer 16, and a A second base film 22 on a side of a base film 12 away from the first matching layer 14, a second matching layer 24 formed on the second base film 22, and a patterned second electrode layer 26. The second matching layer 24 and the second electrode layer 26 are located on the side of the second base film 22 close to the first base film 12. In this embodiment, the first matching layer 14 is a zirconia layer, and the second matching layer 24 is a silicon dioxide layer. The first electrode layer 16 and the second electrode layer 26 respectively form touch sensing electrodes and touch driving electrodes of the touch panel 100. The touch sensing electrodes are used to receive touch driving signals. The electrodes are used to generate and send out touch sensing signals.

The first base film 12 may be formed of transparent glass or transparent plastic. The first matching layer 14 at least completely covers the surface of the first base film 12 on the side where the first electrode layer 16 is formed. The first electrode layer 16 is a metal oxide transparent conductive material. In this embodiment, the first electrode layer 16 is indium tin oxide. In other embodiments, the first electrode layer 16 is not limited to indium tin oxide. The first electrode layer 16 partially covers the first base film 12. As the first base film 12 is not provided with the first electrode layer 16 area and the area where the first electrode layer 16 is provided, the optical performance is easy There is a difference, that is, the refractive index of the area where the first electrode layer 16 is provided and the area where the first electrode layer 16 is not provided are different, so there are two visual effects. The first matching layer 14 is used to reduce this difference, so that the optical performance of the laminated body where the first base film 12, the first matching layer 14, and the first electrode layer 16 are combined tends to be Nearly consistent, that is, the refractive index of the region where the first electrode layer 16 is provided and the region where the first electrode layer 16 is not provided tends to be consistent.

The second base film 22 may be formed of transparent glass or transparent plastic. The second matching layer 24 at least completely covers the surface of the second base film 22 on the side where the second electrode layer 26 is formed. The second electrode layer 26 is a metal oxide transparent conductive material. In this embodiment, the second electrode layer 26 is indium tin oxide. In other embodiments, the second electrode layer 26 is not limited to indium tin oxide. The second electrode layer 26 partially covers the second base film 22. Since the second base film 22 is not provided with the second electrode layer 26 in the region and provided with the second electrode layer 26, the optical performance is easy There is a difference, that is, the area where the second electrode layer 26 is provided This is different from the refractive index of the region where the second electrode layer 26 is not provided, so there are two visual effects. The second matching layer 24 is used to reduce the difference, so that the optical performance of the laminate of the second base film 22, the second matching layer 24, and the second electrode layer 26 tends to be higher. Nearly consistent, that is, the refractive index of the region where the second electrode layer 26 is provided and the region where the second electrode layer 26 is not provided tends to be consistent.

Referring to FIG. 3, the touch panel 100 in this embodiment further includes a transparent cover plate 30 and two optically transparent conductive adhesive layers 40. The cover plate 30 is disposed on a side of the first electrode layer 16 away from the first base film 12. One of the optically transparent adhesive layers 40 is located between the first electrode layer 16 and the cover plate 30 for bonding the first electrode layer 16 and the cover plate 30; the other is optically transparent The adhesive layer is located between the second electrode layer 26 and the first base film 12 for bonding the first base film 12 and the second electrode layer 26.

Further referring to FIG. 3, the thickness of the first matching layer 14 in this embodiment is at least three times the thickness of the second matching layer 24. For example, when the thickness of the second matching layer 24 is 200 angstroms, the thickness of the first matching layer 14 is not less than 600 angstroms. The density of the first matching layer 14 is at least twice the density of the second matching layer 24. For example, when the density of the second matching layer 24 is 2.2 g/cm3, the density of the first matching layer 14 is not less than 4.4 g/cm3. In particular, in other embodiments, the first matching layer 14 is not limited to zirconia.

5 and 6 together, in this embodiment, the first electrode layer 16 includes a plurality of first strip-shaped electrodes 50 extending along a first direction, and the second electrode layer 26 includes a plurality of first strip electrodes 50 extending along a second direction. The second strip-shaped electrode 60 extends in the direction, and the line width of the first strip-shaped electrode 50 is smaller than the line width of the second strip-shaped electrode 60. The first direction crosses the second direction. When the same force is applied to the first electrode layer 16 and the second electrode layer 26, the structure of the first strip electrode 50 of the first electrode layer 16 is more likely to be destroyed. The line width refers to the width of the touch sensing electrode 161 or the touch driving electrode 261 in a direction perpendicular to the extension direction thereof. Also, because the first electrode layer 16 is closer to the cover plate 30 than the second electrode 26, when the falling ball test (touch panel surface test) is performed from the cover plate 30 side to the touch panel 100, the first electrode layer 16 An electrode layer 16 is hit by the falling ball earlier than the second electrode layer 26, and the first electrode layer 16 partially covers On the first base film 12, the first base film 12 directly bears the impact force of the falling ball. If the first base film 12 is damaged, the first electrode layer 16 will have poor electrical properties, and the touch panel 100 will be damaged. Therefore, the embodiment of the present invention plays a role of protecting the first base film 12 by setting a specific material, thickness, and density of the first matching layer 14.

A comparative example is provided. The structure of the comparative example is consistent with the structure of this embodiment. The only difference is that the first matching layer in the comparative example is silicon dioxide, and the thickness of the silicon dioxide layer is 200 angstroms. It is 2.2 g/cm3, and the first matching layer 14 in this embodiment is a zirconium oxide layer, and the zirconium oxide layer has a thickness of 750 angstroms and a density of 5.9 g/cm3. As shown in Figure 4, by doing a lot of falling ball tests on the present embodiment and the comparative example, the falling ball test is that a 100g steel ball makes a free fall and hits the touch panel for 5 seconds to test the ability of the touch panel to withstand The limit distance of the falling ball test. Each sample of this example and comparative example was tested once, 500 times each. However, for the convenience of the list, the test results of the comparative example and this example were randomly selected 10 times. The test results are statistical, that is, the test results of this example are not The test result is regarded as a particularity, see the following table for details, in which Table 1 is the falling ball test of this embodiment, and Table 2 is the falling ball test of the comparative example.

According to the results of the falling ball test in Table 1, it can be known that the touch panel in this embodiment can withstand a ball impact of 110 cm at the highest and a ball impact of 110 cm at the lowest. By calculation, it can withstand a ball impact of 109 cm under normal circumstances. That is, in general, when the distance tested by the falling ball is less than 109 cm, the touch panel of this embodiment will not be damaged.

According to the results of the falling ball test in Table 2, it can be known that the touch panel in the comparative example can withstand a maximum of 70cm and a minimum of 60cm. According to calculations, it can withstand a 62.5cm impact under normal circumstances. That is, under normal circumstances, when the distance of the falling ball test is less than 62.5 cm, the touch panel of the comparative example will not be damaged.

Comparing Table 1 and Table 2, it can be clearly found that the touch panel sample in Table 1 has a better endurance for the falling ball test. This means that the touch panel in this embodiment is less susceptible to damage than the touch panel in the comparative example. If the touch panel is touched by the same falling ball test, the yield rate of the touch panel in this embodiment is higher. If the product using the touch panel is accidentally dropped by the user, the touch panel in this embodiment is less likely to be damaged, and its quality is better.

The above-mentioned touch panel 100 is based on the original touch panel structure, and by using an appropriate and specific matching layer, the probability of the touch panel being tested by the falling ball is greatly increased, and the quality of the touch panel is significantly improved.

Example two

The touch panel of this embodiment has the same structure as the touch panel 100 of the first embodiment. The only difference is that the second matching layer 24 in the touch panel of this embodiment is made of zirconia. Since the first matching layer 14 and the second matching layer 24 are both zirconia, and the density of zirconia is more than twice the density of silicon dioxide, the Mohs hardness of zirconia is 10, and the Mohs hardness of silicon dioxide is 10. The hardness is 7, so the impact resistance of the matching layer of zirconia material exceeds the impact resistance of the matching layer of silicon dioxide material, that is, the protection of the first base film 12 and the second base film 22 is strengthened.

In particular, the first matching layer 14 and the second matching layer 24 of the touch panel in this embodiment are not limited to zirconia.

Example three

This embodiment provides a method for preparing the touch panel of the first and second embodiments, including: providing a first base film 12, and sequentially forming a laminated first matching layer 14 on the first base film 12 And the first electrode layer 16, the first matching layer 14 is zirconia; a second base film 22 is provided on the second base film 22 on the side close to the first base film 12 to sequentially form laminated The second matching layer 24 and the second electrode layer 26, the second matching layer 24 is formed of silicon dioxide or zirconia material; the second base film 22 and the second base film 22 on which the second matching layer 24 and the second electrode layer 26 are formed are connected The first base film 12 with the first matching layer 14 and the first electrode layer 16 is formed so that the second base film 22 is located on the side of the first base film 12 away from the first matching layer 14, and the second The matching layer 24 and the second electrode layer 26 are located on the side of the second base film 22 close to the first base film 12.

The first electrode layer 16 and the second electrode layer 26 respectively form touch sensing electrodes and touch driving electrodes.

It is understandable that the above preparation method may also be to first connect the second base film 22 and the first base film 12 on which the first matching layer 14 and the first electrode layer 16 are formed, and then on the second base film 22 The stacked second matching layer 24 and the second electrode layer 26 are sequentially formed.

The preparation method further includes: providing two optically transparent conductive adhesive layers 40 and a transparent cover plate 30, wherein one of the optically transparent adhesive layers 40 is formed between the first electrode layer 16 and the cover plate 30 , Bonding the first electrode layer 16 and the cover plate 30; another optically transparent adhesive layer 40 is formed between the second electrode layer 26 and the first base film 12, bonding the The first base film 12 and the second electrode layer 26.

Wherein, the second matching layer 24 is a silicon dioxide layer. The thickness of the zirconium oxide layer is 750 angstroms, and the thickness of the silicon dioxide layer is 200 angstroms. In particular, in other embodiments, the first matching layer 14 is not limited to zirconia, and the second matching layer 24 is not limited to silicon dioxide, and may also be zirconia or other coatings.

The above-mentioned touch panel 100 uses an appropriate and specific matching layer to optimize the structurally weak area of the touch panel 100 in a targeted manner, that is, to strengthen the weak area, which greatly improves the The probability of the touch panel 100 passing the falling ball test and the anti-drop ability of the touch panel 100.

For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be Modifications or equivalent replacements are made without departing from the scope of the technical proposal of the present invention.

100: Touch panel

12: The first basement membrane

14: The first matching layer

16: first electrode layer

22: second basement membrane

24: The second matching layer

26: second electrode layer

30: cover

40: Optically transparent conductive adhesive layer

Claims (8)

A touch panel is improved in that it comprises: a first base film; a first matching layer and a first electrode layer formed on the first base film, and the first matching layer is located between the first base film and the Between the first electrode layers and is a zirconium oxide layer; a second base film located on the side of the first base film away from the first matching layer; and a second base film formed on the second base film close to the The second matching layer and the second electrode layer on one side of the first base film, the second matching layer is located between the second base film and the second electrode layer, and the second matching layer is dioxide A silicon layer or a zirconium oxide layer, the first electrode layer and the second electrode layer respectively form the touch sensing electrode and the touch driving electrode of the touch panel, and the strip electrode of the first electrode layer is larger than the The strip electrodes of the second electrode layer are thin. The touch panel according to claim 1, wherein: when the second matching layer is a silicon dioxide layer, the thickness of the first matching layer is at least three times the thickness of the second matching layer, and The thickness of the first matching layer is not less than 600 angstroms. The touch panel according to claim 1, wherein: when the second matching layer is a silicon dioxide layer, the density of the first matching layer is at least twice the density of the second matching layer. The touch panel according to claim 1, wherein: the touch panel further includes a transparent cover plate, and the cover plate is disposed on a side of the first electrode layer away from the first base film. The touch panel according to claim 4, wherein: the touch panel further includes two optically transparent adhesive layers, and one of the optically transparent adhesive layers is located between the first electrode layer and the cover plate; The other optically transparent adhesive layer is located between the second electrode layer and the first base film. A method for manufacturing a touch panel, the improvement is that it comprises: providing a first base film, on which a first matching layer and a first electrode layer are sequentially formed on the first base film, and the first matching layer is Zirconia layer; a second base film is provided, on the side of the second base film close to the first base film, a stacked second matching layer and a second electrode layer are sequentially formed, and the second matching layer is A silicon dioxide layer or a zirconium oxide layer; connecting the second base film and the first base film so that the second base film is located on the side of the first base film away from the first matching layer; and The first electrode layer and the second electrode layer are respectively formed as touch sensing electrodes and touch driving electrodes, and the strip electrodes of the first electrode layer are thinner than the strip electrodes of the second electrode layer. The method for manufacturing a touch panel according to claim 6, wherein: the step of preparing the second matching layer includes preparing a second matching layer formed of a silicon dioxide material; the step of preparing the first matching layer includes preparing a thickness The first matching layer is at least three times the thickness of the second matching layer and the thickness is not less than 600 angstroms. The method for manufacturing a touch panel according to claim 6, wherein: the step of preparing the second matching layer includes preparing a second matching formed of a silicon dioxide material; the step of preparing the first matching layer includes preparing a density The first matching layer is at least twice the density of the second matching layer.

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