TWI454988B - Touch panel and display device with touch function using the same - Google Patents

Description

Touch panel and touch display using the same

The present invention relates to a touch panel and a touch display using the same, and more particularly to a touch panel including a transparent conductive film and a touch display using the same.

With the development of technology, various electronic devices continue to evolve. Among them, the touch panel is an important milestone in the development of science and technology. The electronic device is equipped with a touch panel, which allows the user to intuitively perform various operations, such as selecting components on the screen, writing, drawing, and the like. Various software and hardware devices with touch panels have been continuously responding, and it has become an important revolution in the information industry.

Currently, there are quite a few types of touch panels developed. However, researchers have found that mutual capacitance inside the touch panel is an important factor affecting the response time of touch sensing. The effect of mutual capacitance has become a bottleneck in the development of touch panels.

Furthermore, the touch panel is often mounted on various electronic components such as a display and a casing. When the touch panel is mounted, it will undoubtedly increase the thickness of the display or the casing. Therefore, researchers are working on how to reduce their thickness to meet the trend of "light, thin, short and small".

In addition, the touch panel is usually disposed on the outermost side of the electronic device, and the surface thereof is in a planar state, and the light reflection phenomenon and the surface atomization phenomenon are easily generated. Therefore, how to improve the phenomenon of light reflection and surface atomization is also one of the research directions.

The present invention relates to a touch panel and a touch display using the same, which utilizes an optically adjustable optical film design to improve the anti-reflection and anti-atomization optical properties of the touch panel and the touch display using the same. The effect can reduce the thickness, improve the mutual capacitance phenomenon, reduce the process steps and reduce the variation of the process defects.

According to an aspect of the invention, a touch panel is proposed. The touch panel includes a first transparent conductive film, a second transparent conductive film, and an optical adjustment film. The optical adjustment film is disposed between the first transparent conductive film and the second transparent conductive film.

According to another aspect of the present invention, a touch display is proposed. The touch display includes a display panel and a touch panel. The display panel is used to display a picture. The touch panel is disposed on the display panel. The touch panel includes a first transparent conductive film, a second transparent conductive film, and an optical adjustment film. The optical adjustment film is disposed between the first transparent conductive film and the second transparent conductive film.

In order to make the above-mentioned contents of the present invention more comprehensible, various embodiments are described below, and in conjunction with the drawings, the detailed description is as follows:

The following is a detailed description of various embodiments, which utilizes the design of an optically-adjustable optical adjustment film to improve the anti-reflection and anti-atomization optical effects of the touch panel and the touch display using the same, and can reduce the thickness, Improve mutual capacitance, reduce process steps and reduce variations in process defects. However, the examples are for illustrative purposes only and are not intended to limit the scope of the invention. Further, the drawings in the embodiments are omitted to partially illustrate the technical features of the present invention.

First embodiment

Please refer to FIG. 1 , which illustrates a schematic diagram of the touch display 100 . The touch display 100 includes a transparent protection board 110 , a display panel 150 , and a touch panel 130 . The transparent protection board 110 is used to protect the touch display 100 to prevent the touch display 100 from being wet, scratched or impacted. The display panel 150 is configured to display a screen, such as a liquid crystal display panel (LCD display), an organic light emitting diode panel (OLED display), or an electronic paper display panel (Electronic Paper Display). In the touch display 100 shown in the schematic diagram, the display panel 150 is illustrated by taking a liquid crystal display panel as an example. The touch panel 130 is configured to sense a signal contacted by the user, such as a capacitive touch panel or an electromagnetic induction touch panel.

The touch panel 130 is disposed between the transparent protection board 110 and the display panel 150. The touch panel 130 and the transparent protection plate 110 are bonded by an Optically Clear Adhesives (OCA) 120. The display panel 150 is disposed on the rear side of the touch panel 130.

Please refer to FIG. 2 , which is an enlarged schematic view of the transparent protection plate 110 , the optical transparent adhesive (OCA) 120 and the touch panel 130 of the first embodiment. The touch panel 130 includes a first transparent conductive film 131 , a second transparent conductive film 132 , and an optical adjustment film 133 . The first transparent conductive film 131 includes a first transparent substrate 131a, a first conductive layer 131b, and a first conductive line 131c. The second transparent conductive film 132 includes a second transparent substrate 132a, a second conductive layer 132b, and a second conductive line 132c. The first transparent substrate 131a and the second transparent substrate 132a are, for example, polyethylene terephthalate (PET) substrates. The material of the first conductive layer 131b and the second conductive layer 132b includes, for example, Indium Tin Oxide (ITO) or Indium Zinc Oxide (IZO), and the first conductive layer 131b and the second conductive layer Layer 132b has a different axial direction. The material of the first conductive line 131c and the second conductive line 132c is, for example, metal, and the first conductive line 131c and the second conductive line 132c are used to transmit signals. The optical adjustment film 133 includes an optical adjustment layer 1331, a first adhesive layer 1332, and a second adhesive layer 1333. The optical adjustment layer 1331 is configured to adjust the incident light L1 incident on the outer surface of the touch panel 130. The external incident light L1 is incident on the touch panel 130 from the outside to the first transparent conductive film 131 to reduce the reflection of the incident light L1. A phenomenon, or an atomization phenomenon caused by a temperature difference. The first adhesive layer 1332 is disposed on one surface of the optical adjustment layer 1331 for bonding with the first transparent conductive film 131. The second adhesive layer 1333 is disposed on the other surface of the optical adjustment layer 1331 for bonding with the second transparent conductive film 132. That is to say, the optical adjustment film 133 itself is viscous without additionally attaching an adhesive material.

The optical adjustment film 133 is disposed between the first transparent conductive film 131 and the second transparent conductive film 132. The optical adjustment layer 1331 of the optical adjustment film 133 has an optical function and is not a general dielectric layer or an optically clear adhesive (OCA). In this embodiment, the optical adjustment layer 1331 includes a polarizer layer 13311 and a phase retardation layer 13312. The polarizing layer 13311 is located adjacent to the first transparent conductive film 131, and the phase retardation layer 13312 is located away from the first transparent conductive film 131.

As shown in FIG. 1 , the touch display 100 of the present embodiment further includes two polarizing plates 140 and 160 disposed on both sides of the display panel 150 using liquid crystal display technology. That is, the optical adjustment film 133 (shown in FIG. 2 ) of the touch panel 130 is disposed between the transparent protection plate 110 and the polarizing plate 140 . When the external incident light L1 is incident on the touch display 100 and projected onto the polarizing plate 140, the reflected light L2 of the external incident light L1 will have only a fixed polarization direction. After the reflected light L2 is reflected to the optical adjustment film 133 of the touch panel 130, the phase retardation layer 13312 and the polarizing layer 13311 of the optical adjustment film 133 block the reflected light L2 from passing through, and cannot be emitted to the outside, or the reflected light L2 can be reduced. The amount of light that passes through to the outside world. Therefore, the reflection phenomenon of the incident light L1 entering the touch display 100 will be greatly reduced.

Moreover, when the incident light L1 is incident on the touch display 100, the traversing of different materials may generate reflected light. The optical adjustment film 133 of the present embodiment is disposed between the first transparent conductive film 131 and the second transparent conductive film 132 at a position relatively close to the outer side of the touch display 100. Most of the reflected light L2 is generated inside the optical adjustment film 133, and these reflected light L2 are blocked by the optical adjustment film 133 and cannot be emitted to the outside.

Further, the polarizing layer 13311 and the phase retardation layer 13312 of the optical adjustment film 133 have a conductivity of less than 10 ^-8 S/cm. That is, the optical adjustment film 133 has an insulating property, which can well isolate the first transparent conductive film 131 and the second transparent conductive film 132 to avoid a short circuit phenomenon. The first transparent conductive film 131 and the second transparent conductive film 132 are not interposed with the remaining dielectric layers except for the optical adjustment film 133.

Further, in the present embodiment, the thickness D1 of the optical adjustment film 133 is about 180 μm. The thickness D1 allows the first transparent conductive film 131 and the second transparent conductive film 132 to be maintained at a certain distance to reduce the mutual capacitance, thereby greatly reducing the reaction time of the touch sensing.

In addition, the materials of the layers of the touch panel 130 are rolled from one side to the other by a roller to complete the bonding process. The bonding process requires special attention to the bubbles and alignment to avoid undesirable phenomena that are difficult to recover. The optical adjustment film 133 of the present embodiment itself has the first adhesive layer 1332 and the second adhesive layer 1333, and does not require an additional bonding process to conform to any adhesive film. In this way, the number of times of the bonding process of the touch panel 130 is reduced, and the occurrence of bubbles or misalignment can be greatly reduced.

Second embodiment

Please refer to FIG. 3 , which is an enlarged schematic view of the transparent protection plate 110 , the optical transparent adhesive (OCA) 120 and the touch panel 230 of the second embodiment. The touch panel 230 of the present embodiment is different from the touch panel 130 of the first embodiment in the optical adjustment film 233, and the rest are the same and will not be repeatedly described.

As shown in FIG. 3, the optical adjustment layer 2331 of the optical adjustment film 233 includes an anti-reflection layer 23311, such as a multilayer refractive material structure, a gradient layer refraction material structure or a moth eye structure. When external light is incident on the touch panel 230, when the external light passes through the anti-reflection layer 23311, most of the external light is refracted internally by the characteristics of the anti-reflection layer 23311, so that the reflection phenomenon is greatly reduced.

Further, the conductivity of the anti-reflection layer 23311 of the optical adjustment film 233 is less than 10 ^-8 S/cm. That is to say, the optical adjustment film 233 of the present embodiment also has good insulating properties, which can well isolate the first transparent conductive film 131 and the second transparent conductive film 132 from the phenomenon of short circuit.

Furthermore, the thickness D2 of the optical adjustment film 233 using the anti-reflection layer 23311 in this embodiment is about 150 micrometers (μm). The thickness of the first transparent conductive film 131 and the second transparent conductive film 132 can also be maintained at a certain distance to reduce the mutual capacitance, thereby greatly reducing the reaction time of the touch sensing.

Third embodiment

Please refer to FIG. 4 , which is an enlarged schematic view of the transparent protection plate 110 , the optical transparent adhesive (OCA) 120 and the touch panel 330 of the third embodiment. The touch panel 330 of the present embodiment is different from the touch panel 130 of the first embodiment in the optical adjustment film 333, and the rest are the same and will not be repeatedly described.

As shown in FIG. 4, the optical adjustment layer 3331 of the optical adjustment film 333 includes an anti-fogging layer 33311. By the characteristics of the anti-atomization layer 33311, when the temperature changes or the user touches with a finger, the phenomenon of fogging is less likely to occur.

Further, the anti-atomization layer 33311 of the optical adjustment film 333 has a conductivity lower than 10 ^-8 S/cm. That is to say, the optical adjustment film 333 of the present embodiment also has good insulation properties, which can well isolate the first transparent conductive film 131 and the second transparent conductive film 132 from the phenomenon of short circuit.

Furthermore, the thickness D3 of the optical adjustment film 333 using the anti-fogging layer 33311 in this embodiment is about 125 micrometers (μm). The thickness of the first transparent conductive film 131 and the second transparent conductive film 132 can also be maintained at a certain distance to reduce the mutual capacitance, thereby greatly reducing the reaction time of the touch sensing.

The touch panel disclosed in the above embodiments of the present invention and the touch display using the same use the optical adjustment film design with optical functions to improve the anti-reflection and anti-fogging of the touch panel and the touch display thereof. Optical effects, and can reduce thickness, improve mutual capacitance, reduce process steps and reduce variations in process defects.

In view of the above, the present invention has been disclosed in various embodiments, and is not intended to limit the present invention. A person skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims.

100‧‧‧ touch display

110‧‧‧Transparent protection board

120‧‧‧Optical transparent adhesive

130, 230, 330‧‧‧ touch panels

131‧‧‧First transparent conductive film

131a‧‧‧First transparent substrate

131b‧‧‧First conductive layer

131c‧‧‧First conductive line

132‧‧‧Second transparent conductive film

132a‧‧‧Second transparent substrate

132b‧‧‧Second conductive layer

132c‧‧‧Second conductive line

133, 233, 333‧‧‧ optical adjustment film

1331, 2331, 3331‧‧‧ optical adjustment layer

13311‧‧‧ polarizing layer

13312‧‧‧ phase retardation layer

1332‧‧‧First adhesive layer

1333‧‧‧Second Adhesive Layer

140, 160‧‧‧ polarizing plate

150‧‧‧ display panel

23311‧‧‧Anti-reflection layer

33311‧‧‧Anti-atomization layer

D1, D2, D3‧‧‧ thickness

L1, L3‧‧‧ outside incident light

L2, L4‧‧‧ reflected light

FIG. 1 is a schematic diagram of a touch display.

FIG. 2 is an enlarged schematic view showing the transparent protection plate, the optical transparent adhesive and the touch panel of the first embodiment.

FIG. 3 is an enlarged schematic view showing the transparent protection plate, the optical transparent adhesive and the touch panel of the second embodiment.

FIG. 4 is an enlarged schematic view showing the transparent protective plate, the optical transparent adhesive and the touch panel of the third embodiment.

110. . . Transparent protection board

120. . . Optical transparent adhesive

130. . . Touch panel

131. . . First transparent conductive film

131a. . . First transparent substrate

131b. . . First conductive layer

131c. . . First conductive line

132. . . Second transparent conductive film

132a. . . Second transparent substrate

132b. . . Second conductive layer

132c. . . Second conductive line

133. . . Optical adjustment film

1331. . . Optical adjustment layer

13311. . . Polarizing layer

13312. . . Phase retardation layer

1332. . . First adhesive layer

1333. . . Second adhesive layer

D1. . . thickness

L1. . . External incident light

Claims (12)

A touch panel includes: a first transparent conductive film; a second transparent conductive film; and an optical adjustment film disposed between the first transparent conductive film and the second transparent conductive film, the optical adjustment film includes An optical adjustment layer is configured to adjust a light incident on the touch panel, and the light is incident on the first transparent conductive film from the outside to the touch panel, and the optical adjustment layer includes a polarizing layer And a phase retardation layer located adjacent to the first transparent conductive film, and the phase retardation layer is located away from the first transparent conductive film. The touch panel of claim 1, wherein the optical adjustment layer comprises an anti-reflection layer. The touch panel of claim 1, wherein the optical adjustment layer comprises an anti-fogging layer. The touch panel of claim 1, wherein the optical adjustment layer has a conductivity of less than 10 ^-8 S/cm. The touch panel of claim 1, wherein the optical adjustment film further comprises: a first adhesive layer disposed on a surface of the optical adjustment layer for bonding with the first transparent conductive film; A second adhesive layer is disposed on the other surface of the optical adjustment layer for bonding with the second transparent conductive film. The touch panel of claim 1, wherein the The thickness of the optical adjustment film is between 125 micrometers (μm) and 180 micrometers (μm). A touch display includes: a display panel for displaying a picture; and a touch panel disposed on the display panel, the touch panel comprising: a first transparent conductive film; and a second transparent conductive film And disposed between the first transparent conductive film and the display panel; and an optical adjustment film disposed between the first transparent conductive film and the second transparent conductive film, the optical adjustment film includes an optical adjustment layer, The optical adjustment layer is configured to adjust a light incident on the touch panel, and the light is incident on the first transparent conductive film from the outside to the touch panel, and the optical adjustment layer includes a polarizer layer and A phase retardation layer is located adjacent to the first transparent conductive film, and the phase retardation layer is located away from the first transparent conductive film. The touch display of claim 7, wherein the optical adjustment layer comprises an anti-reflection layer. The touch display of claim 7, wherein the optical adjustment layer comprises an anti-fogging layer. The touch display of claim 7, wherein the optical adjustment layer has a conductivity of less than 10 ^-8 S/cm. The touch display of claim 7, wherein The optical adjustment film further includes: a first adhesive layer disposed on a surface of the optical adjustment layer for bonding with the first transparent conductive film; and a second adhesive layer disposed on the other of the optical adjustment layer a surface for bonding to the second transparent conductive film. The touch display of claim 7, wherein the optical adjustment film has a thickness of between 125 micrometers (μm) and 180 micrometers (μm).