TW201818422A - Transparent conductive film - Google Patents

Abstract

A transparent conductive film includes a transparent substrate and a transparent conductive layer. The transparent substrate has a first surface and an opposite second surfaces, wherein a material of the transparent substrate is cellulose triacetate (TAC), cyclic olefin copolymer (COC), polycarbonate (PC) or cyclic olefin polymer (COP). The transparent conductive layer disposed on at least one of the first surface and the second surface of the transparent substrate, wherein a material of the transparent conductive layer is indium tin oxide (ITO) and a line impedance of the transparent conductive layer is smaller than or equal to 2.8 x 10<SP>-4</SP>[Omega]/cm.

Description

Transparent conductive film

The present invention relates to a transparent conductive film, and more particularly to a transparent conductive film applied to a touch device.

The conventional touch devices include technical architectures such as Out-Cell, On-Cell, and In-Cell. The Out-Cell touch technology refers to the touch panel module externally mounted on the display module, and has a single glass touch scheme (OGS), double glass (GG), and double film (Cover Glass/Sensor Film X/Sensor). Film Y, GFF) and other major touch solutions. The In-Cell touch technology further integrates the touch panel module into the display panel, that is, the color filter glass and the thin film transistor (TFT) glass are combined in the Cell, but the process is complicated. Any process error may result in a decrease in product yield. In addition, the above technology is applicable to a small number of hand-held touch devices, but due to cost, weight and process technology issues, it is not suitable for medium and large size touch display devices, such as notebook computers, industrial control touches, E-books and other devices.

In view of this, how to thin and light the touch display module and apply to the medium and large size touch display device is currently an extremely demanding goal.

The present invention provides a transparent conductive film and a display device which is provided with an indium tin oxide transparent conductive layer having a line resistance of 2.8 x 10 ^-4 Ω/cm or less on a transparent substrate of a non-birefringent material. In this way, forming a conductive pattern on the transparent conductive layer to form a part of the projected capacitive touch module and integrating it into the polarizer of the display module can reduce the thickness of the overall touch display module.

The transparent conductive film according to an embodiment of the present invention comprises a transparent substrate and a transparent conductive layer. The transparent substrate has a first surface and a second surface opposite thereto, wherein the material of the transparent substrate is cellulose triacetate (TAC), cyclic olefin copolymer (COC), polycarbonate (PC) or cycloolefin polymer. (COP). The transparent conductive layer is disposed on at least one of the first surface and the second surface of the transparent substrate, wherein the transparent conductive layer is made of indium tin oxide (ITO), and the linear conductive layer has a line impedance of 2.8 x 10 ^-4 Ω/min or less. Cm.

The purpose, technical contents, features, and effects achieved by the present invention will become more apparent from the detailed description of the appended claims.

The embodiments of the present invention will be described in detail below with reference to the drawings. In addition to the detailed description, the present invention may be widely practiced in other embodiments, and any alternatives, modifications, and equivalent variations of the described embodiments are included in the scope of the present invention. quasi. In the description of the specification, numerous specific details are set forth in the description of the invention. In addition, well-known steps or elements are not described in detail to avoid unnecessarily limiting the invention. The same or similar elements in the drawings will be denoted by the same or similar symbols. It is to be noted that the drawings are for illustrative purposes only and do not represent the actual dimensions or quantities of the components. Some of the details may not be fully drawn in order to facilitate the simplicity of the drawings.

Referring to FIG. 1 , a transparent conductive film 10 according to an embodiment of the present invention includes a transparent substrate 11 and a transparent conductive layer 12 . The transparent substrate 11 has a first surface 11a and a second surface 11b opposite thereto. In one embodiment, the material of the transparent substrate 11 is a non-birefringence material. For example, the non-birefringent material may be a cellulose triacetate (TAC) or a cyclic olefin copolymer. (cyclic olefin copolymer, COC), polycarbonate (Polycarbonate, PC) or cyclic olefin polymer (COP). It can be understood that the non-birefringent material does not cause the "corona phenomenon" due to the different incident angles of the incident light, causing the light to refract in different directions. The transparent conductive layer 12 is disposed on at least one of the first surface 11a and the second surface 11b of the transparent substrate 11. For example, in the embodiment shown in FIG. 1, the transparent conductive layer 12 is disposed on the second surface 11b of the transparent substrate 11. In the embodiment shown in FIG. 2, the transparent conductive layer 12 is disposed on the transparent substrate 11. The first surface 11a and the second surface 11b. It can be understood that the plurality of transparent conductive layers 12 can be respectively disposed on the plurality of transparent substrates 11, and the plurality of transparent substrates 11 are further bonded together, and an equivalent structure to the embodiment shown in FIG. 2 can also be formed. In short, the transparent conductive film of the present invention may also be a structure of a multilayer transparent substrate.

In one embodiment, the material of the transparent conductive layer 12 may be Indium Tin Oxide (ITO) or other similar materials. Preferably, the line resistance of the transparent conductive layer 12 is 2.8 x 10 ^-4 Ω/cm or less. The transparent conductive layer 12 has a conductive pattern for the purpose of circuit design. For example, the conductive pattern of the transparent conductive layer 12 can form part of the projected capacitive touch module by a suitable circuit design or layout, so that the transparent conductive film 10 of the present invention can be used as a touch film. It can be understood that the smaller the line impedance of the transparent conductive layer 12, the shorter the reaction time of the touch film or the larger the size of the display module.

Referring to FIG. 3, in an embodiment, the transparent conductive film of the present invention further comprises an optical interference layer 13. The optical interference layer 13 is disposed between the transparent substrate 11 and the transparent conductive layer 12. It can be understood that the position of the transparent conductive layer 12 that is not covered by the pattern is exposed to the optical interference layer 13. According to this configuration, when the transparent conductive film of the present invention reflects the external light rays L1, L2, although the optical path difference is caused by the height difference of the transparent conductive layer 12, the optical interference layer 13 can compensate for the optical path difference of the light L2. Influence, which in turn reduces chromatic aberration. Therefore, in the embodiment shown in FIG. 3, the transparent conductive film of the present invention can lighten the conductive pattern of the transparent conductive layer 12. It will be understood by those of ordinary skill in the art to which the present invention pertains that the optical interference layer 13 can be a single layer or a multilayer structure.

It can be understood that the thicker the transparent conductive layer 12 is, the smaller the resistance is. However, the thickness of the transparent conductive layer 12 is too thick, and the optical interference layer 13 will be difficult to compensate for the chromatic aberration caused by the difference in height of the transparent conductive layer 12. In one embodiment, the thickness of the transparent conductive layer 12 is less than or equal to 30 nm. Preferably, the thickness of the transparent conductive layer 12 is less than or equal to 20 nm.

Referring to FIG. 4, in an embodiment, the transparent conductive film of the present invention further comprises a polarizer 14 having a third surface 14a and a fourth surface 14b opposite thereto. For example, the polarizer 14 includes a first non-birefringent material layer 141, a polyvinyl alcohol (PVA) layer 142, and a second non-birefringent material layer 143, wherein the first non-double The refractive material layer 141 and the second non-birefringent material layer 143 may be the above non-birefringent materials, that is, cellulose triacetate (TAC), cyclic olefin copolymer (COC), polycarbonate (PC) or cyclic olefin. Polymer (COP). The polyvinyl alcohol layer 142 has polarizing characteristics. For example, the polyvinyl alcohol layer 142 contains iodine. The third surface 14a and the fourth surface 14b are an outer surface of the first non-birefringent material layer 141 and the second non-birefringent material layer 143, respectively. The transparent substrate 11 including the transparent conductive layer 12 is adhered to at least one of the third surface 14a and the fourth surface 14b of the polarizer 14. In the embodiment shown in FIG. 4, the transparent substrate 11 faces the polarizer 14 with one side of the transparent conductive layer 12, and is adhered to the third surface 14a of the polarizer 14 by an optical glue (not shown). Thus, the transparent substrate 11 can function to protect the transparent conductive layer 12. In one embodiment, referring to FIG. 5, the polarizer 14 can integrate a plurality of transparent conductive films, for example, a transparent conductive film composed of a transparent substrate 11 and a transparent conductive layer 12, and a transparent substrate 11' and a transparent conductive layer. The transparent conductive film formed by 12' is on the third surface 14a of the polarizer 14, so that it can be used as a more precise or diverse touch application, such as multi-touch.

According to the embodiment shown in FIG. 4 and FIG. 5, the transparent conductive film (touch film) of the present invention can be integrated with a polarizer in a single film, so that the thickness of the touch display module can be greatly reduced. Further, the transparent conductive layer 12 is protected by the transparent substrate 11 or the polarizer 14 without being directly contacted by the user, so that the glass plate of the surface layer can be omitted. In other words, the transparent conductive film (touch film) of the present invention can be applied to a medium and large size touch display device, such as a notebook computer, an industrial touch, an electronic book, and the like.

It can be understood that the material of the transparent substrate 11 is a non-birefringent material, and the outer layer of the polarizer 14 is the first non-birefringent material layer 141 and the second non-birefringent material layer 143 is also a non-birefringent material, and therefore, the polarized light The first non-birefringent material layer 141 or the second non-birefringent material layer 143 of the sheet 14 may be substituted for the transparent substrate 11. For example, referring to FIG. 6, the transparent conductive layer 12 may be disposed on the outer side surface of the first non-birefringent material layer 141, that is, the third surface 14a. Alternatively, the transparent conductive layer 12 may be disposed on the inner surface of the first non-birefringent material layer 141, that is, the transparent conductive layer 12 is disposed between the first non-birefringent material layer 141 and the polyvinyl alcohol layer 142, as shown in FIG. 7. Shown. According to the structure shown in FIG. 6 or FIG. 7, the transparent substrate 11 (shown in FIG. 4) can be omitted to further reduce the thickness of the touch display module.

In summary, the transparent conductive film and the display device of the present invention are provided with an indium tin oxide transparent conductive layer having a line resistance of 2.8 x 10 ^-4 Ω/cm or less on a transparent substrate of cellulose triacetate (TAC). In this way, forming a conductive pattern on the transparent conductive layer to form a part of the projected capacitive touch module and integrating it into the polarizer of the display module can reduce the thickness of the overall touch display module. Preferably, an optical interference layer is disposed between the transparent substrate and the transparent conductive layer to reduce the chromatic aberration caused by the reflected optical path difference to dilute the conductive pattern of the transparent conductive layer.

The embodiments described above are only intended to illustrate the technical idea and the features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention. That is, the equivalent variations or modifications made by the spirit of the present invention should still be included in the scope of the present invention.

10‧‧‧Transparent conductive film

11‧‧‧Transparent substrate

11a‧‧‧ first surface

11b‧‧‧ second surface

12‧‧‧Transparent conductive layer

13‧‧‧Optical interference layer

14‧‧‧ polarizer

141‧‧‧First non-birefringent material layer

142‧‧‧ polyvinyl alcohol layer

143‧‧‧Second non-birefringent material layer

14a‧‧‧ third surface

14b‧‧‧Fourth surface

L1, L2‧‧‧ external light

Fig. 1 is a schematic view showing a transparent conductive film of a first embodiment of the present invention. Fig. 2 is a schematic view showing a transparent conductive film of a second embodiment of the present invention. Fig. 3 is a schematic view showing a transparent conductive film of a third embodiment of the present invention. Fig. 4 is a schematic view showing a transparent conductive film of a fourth embodiment of the present invention. Fig. 5 is a schematic view showing a transparent conductive film of a fifth embodiment of the present invention. Figure 6 is a schematic view showing a transparent conductive film of a sixth embodiment of the present invention. Figure 7 is a schematic view showing a transparent conductive film of a seventh embodiment of the present invention.

Claims (8)

A transparent conductive film comprising: a transparent substrate having a first surface and a second surface opposite thereto, wherein the material of the transparent substrate is cellulose triacetate (TAC), a cyclic olefin copolymer ( a cyclic olefin copolymer (COC), a polycarbonate (PC) or a cyclic olefin polymer (COP); and a transparent conductive layer disposed on the first surface and the second surface of the transparent substrate At least one of the materials, wherein the transparent conductive layer is made of indium tin oxide, and the transparent conductive layer has a line resistance of 2.8 x 10 ^-4 Ω/cm or less. The transparent conductive film of claim 1, further comprising: an optical interference layer disposed between the transparent substrate and the transparent conductive layer. The transparent conductive film of claim 2, wherein the transparent conductive layer has a conductive pattern and exposes the optical interference layer. The transparent conductive film of claim 3, wherein the conductive pattern forms part of a projected capacitive touch module. The transparent conductive film of claim 1, further comprising: a polarizer having a third surface and a fourth surface, wherein the transparent substrate is adhered to the third surface of the polarizer and the fourth At least one of the surfaces. The transparent conductive film of claim 5, wherein the transparent substrate is adhered to the polarizer toward the polarizer by at least one of the third surface and the fourth surface. The transparent conductive film of claim 1, further comprising: a polarizer comprising at least one non-birefringent material layer, wherein the transparent substrate is the non-birefringent material layer of the polarizer, and the non-birefringent material layer The material is cellulose triacetate (TAC), cyclic olefin copolymer (COC), polycarbonate (PC) or cyclic olefin polymer (COP). The transparent conductive film according to claim 1, wherein the transparent conductive layer has a thickness of 30 nm or less.