TWM461102U - Bi-layer type touch panel without electrode exposure - Google Patents

Description

Double-plate touch panel to avoid electrode appearance

This creation is a touch panel, especially a double-plate touch panel that avoids the appearance of electrodes.

Please refer to the known dual-plate touch panel shown in FIG. 3, which includes a first substrate 41, a plurality of first sensing electrodes 42, a second substrate 43, a plurality of second sensing electrodes 44, a sealant 45 and an optical adhesive. Layer 46.

The first substrate 41 and the second substrate 43 are opposite to each other and have an inner surface. The first sensing electrodes 42 are formed on the inner surface of the first substrate 41, and the second sensing electrodes 44 are formed on the first substrate 41. The inner surface of the second substrate 43 is disposed between the inner surfaces of the first and second substrates 41 and 43 to bond the first and second substrates 41 and 43. The optical adhesive layer 46 is filled with Between the first and second substrates 41, 43.

Referring to FIG. 4, for convenience of description, taking the second substrate 43 and the second sensing electrode 44 as an example, it is known that the refractive index (n1) of air is 1, and the second sensing electrode 44 is an indium tin oxide (ITO) electrode. For example, the refractive index (n2) of the indium tin oxide electrode is 1.8, and the refractive index of the second substrate 43 is exemplified by a glass substrate, and the refractive index (n3) of the glass substrate is 1.5.

The total reflectance of the light (L1) through the air, the second sensing electrode 44 and the second substrate 43 is:

The total reflectance of the light (L2) sequentially passing through the air and the second substrate 43 is:

It can be seen that there is a significant difference in the reflectance of the light between the sensing electrode and the non-inductive electrode region in the single substrate, and the difference between the two is as high as 17.7%, (37.7-20)%=17.7%, so that the light passes through the touch panel. Poor uniformity results in chromatic aberration.

The touch panel is combined with the display panel to form a touch display device, such as a smart phone or a tablet computer. When the user operates the touch display device, the sensible electrode and the area without the sensing electrode form a color difference in the touch panel, so that the user can easily observe the sensing electrode and affect the efficiency and fun of using the touch display device, resulting in use. Troubled.

The main purpose of this creation is to provide a two-plate touch panel that avoids the appearance of electrodes, and it is desirable to improve the chromatic aberration caused by light passing through existing touch panels.

The touch panel for preventing the electrode from being formed includes: a first substrate having an inner surface; a plurality of first sensing electrodes formed on an inner surface of the first substrate; and a first transparent insulating film formed on the first surface An inner surface of a substrate and covering the first sensing electrodes; a second substrate disposed opposite to the first substrate and having a side opposite An inner surface of the first substrate; a plurality of second sensing electrodes formed on the inner surface of the second substrate; a second transparent insulating film formed on the inner surface of the second substrate and covering the second sensing electrodes; a glue disposed between the inner surfaces of the first and second substrates; and an optical adhesive layer formed between the first transparent insulating film and the second transparent insulating film.

According to the structure of the present invention, by the arrangement of the first and second transparent insulating films, when the light passes through the original touch panel, the light passes through the first and second transparent insulating films, and the first and the second The refractive index of the two transparent insulating films is similar to that of the first substrate, the second substrate, the first sensing electrode and the second sensing electrode, so that the two transparent insulating films have the reflectance of the sensing electrode region and the non-inductive electrode region in the touch panel. More evenly, it effectively improves the defect of chromatic aberration in the sensing electrode region in the existing touch panel.

11‧‧‧First substrate

12‧‧‧First sensing electrode

13‧‧‧First transparent insulating film

21‧‧‧second substrate

22‧‧‧Second sensing electrode

23‧‧‧Second transparent insulating film

31‧‧‧Box glue

32‧‧‧Optical adhesive layer

41‧‧‧First substrate

42‧‧‧First sensing electrode

43‧‧‧second substrate

44‧‧‧Second sensing electrode

45‧‧‧Box glue

46‧‧‧Optical adhesive layer

Figure 1: Schematic diagram of a preferred embodiment of the present invention.

FIG. 2 is a reference diagram of light passing through the second substrate, the second sensing electrode, and the second transparent insulating film.

Figure 3: Schematic diagram of a known touch panel.

Figure 4: A reference view of light passing through a second substrate and a second sensing electrode of a known touch panel.

Referring to FIG. 1 , a preferred embodiment of the present invention includes a first substrate 11 , a plurality of first sensing electrodes 12 , and a first transparent insulating film. 13. A second substrate 21, a plurality of second sensing electrodes 22, a second transparent insulating film 23, a sealant 31, and an optical adhesive layer 32.

The first substrate 11 has an inner surface. The first sensing electrodes 12 are formed on an inner surface of the first substrate 11. The first transparent insulating film 13 is formed on the inner surface of the first substrate 11 and covers the first sensing electrodes 12, and the refractive index of the first transparent insulating film 13 is similar to that of the first substrate 11 and the first sensing electrode 12. .

The second substrate 21 is disposed opposite to the first substrate 11 and has an inner surface facing the first substrate 11 . The second sensing electrodes 22 are formed on the inner surface of the second substrate 21. The second transparent insulating film 23 is formed on the inner surface of the second substrate 21 and covers the second sensing electrodes 22, and the refractive index of the second transparent insulating film 23 is similar to that of the second substrate 21 and the second sensing electrode 22. .

The sealant 31 is disposed around the inner surfaces of the first and second substrates 11, 21 to bond the first and second substrates 11, 21.

The optical adhesive layer 32 is filled between the first transparent insulating film 13 and the second transparent insulating film 23.

It is known that the refractive index (n1) of air is 1. The first and second sensing electrodes 12, 22 may be indium tin oxide (ITO) electrodes, and the indium tin oxide (ITO) electrode has a refractive index (n2) of 1.8 and a thickness of 120 nm. The first and second substrates 11, 21 may be a glass substrate having a refractive index (n3) of 1.5. The first and second transparent insulating films 13, 23 may be a polyimide film or an inorganic metal oxide (SiO2-TiO2-ZrO2) film, wherein the inorganic metal oxide (SiO2-TiO2-ZrO2) film The refractive index (n4) is 1.7, the refractive index of the polyimide film is 1.6, and the preferred embodiment is an inorganic metal oxide. For example, the (SiO2-TiO2-ZrO2) film has a thickness of between 30 and 120 nm.

For convenience of description, please refer to FIG. 2, taking the second substrate 21, the second sensing electrode 22 and the second transparent insulating film 23 as an example, the light (A) sequentially passes through the air, the second transparent insulating film 23, and the second. The total reflectance of the sensing electrode 22 and the second substrate 21 is:

The total reflectance of the light (B) sequentially passing through the air, the second transparent insulating film 23 and the second substrate 21 is:

It can be seen that, by the arrangement of the first and second transparent insulating films 13, 23, the difference in the light reflectance between the sensing electrodes and the non-inductive electrodes is only 5.75% in a single substrate, (37.9-32.15). )%=5.75%. Compared with 17.7% of the prior art, the present invention greatly reduces the difference in reflectivity of light in the touch panel, improves the uniformity of light passing through the touch panel, and prevents the electrode from appearing in the created touch panel.

When the touch panel and the display panel are combined to form a touch display device, such as a smart phone or a tablet computer, the user does not easily observe the sensing electrodes, thereby improving the efficiency and fun of using the touch display device.

11‧‧‧First substrate

12‧‧‧First sensing electrode

13‧‧‧First transparent insulating film

21‧‧‧second substrate

22‧‧‧Second sensing electrode

23‧‧‧Second transparent insulating film

31‧‧‧Box glue

32‧‧‧Optical adhesive layer

Claims (7)

A double-plate touch panel for avoiding electrode development, comprising a first substrate having an inner surface; a plurality of first sensing electrodes formed on an inner surface of the first substrate; and a first transparent insulating film formed on the first surface An inner surface of a substrate covers the first sensing electrodes; a second substrate is disposed opposite the first substrate and has an inner surface facing the first substrate; and a plurality of second sensing electrodes are formed thereon An inner surface of the second substrate; a second transparent insulating film formed on the inner surface of the second substrate and covering the second sensing electrodes; a sealant disposed between the inner surfaces of the first and second substrates; An optical adhesive layer is formed between the first transparent insulating film and the second transparent insulating film. The double-plate touch panel of claim 1 is characterized in that the thickness of the first and second transparent insulating films is between 30 and 120 nm. A double-plate touch panel that avoids electrode appearance as described in claim 1 or 2, wherein the first and second sensing electrodes have a thickness of 120 nm. The double-plate touch panel of claim 3, wherein the first and second transparent insulating films are respectively Polyimide films. The double-plate type touch panel for avoiding electrode appearance as described in claim 3, wherein the first and second transparent insulating films are respectively SiO2-TiO2-ZrO2 films. The double-plate touch panel of claim 3, wherein the first and second sensing electrodes are respectively indium tin oxide electrodes. A double-plate touch panel that avoids electrode appearance as described in claim 1 The first and second sensing electrodes have a refractive index of 1.8, and the first and second substrates have a refractive index of 1.5.