KR102187791B1 - Touch panel and touch device with the same - Google Patents

Abstract

The touch panel according to the embodiment includes an electrode substrate; An electrode disposed on the electrode substrate and sensing a position; Wiring electrically connected to the electrode; And a blocking layer disposed on the electrode and blocking a part of light.
A touch device according to an embodiment includes a touch panel; And a driving unit disposed on the touch panel, wherein the touch panel includes: an electrode substrate; An electrode disposed on the electrode substrate and sensing a position; Wiring electrically connected to the electrode; And a blocking layer disposed on the electrode and blocking a part of light.

Description

A touch panel and a touch device including the same {TOUCH PANEL AND TOUCH DEVICE WITH THE SAME}

The present disclosure relates to a touch panel and a touch device including the same.

Recently, in various electronic products, a touch panel for inputting an image displayed on a display device by contacting an input device such as a finger or a stylus has been applied.

The touch panel may be typically classified into a resistive type touch panel and a capacitive type touch panel. When a pressure is applied to an input device, a resistive touch panel detects a change in resistance according to a connection between electrodes and detects a position. The capacitive touch panel detects a change in capacitance between electrodes when a finger touches it and detects a position. In consideration of the convenience and sensing power of the manufacturing method, the capacitive method has recently attracted attention in small models.

In the case of an electrode applied to such a touch panel, there is a problem in that the electrode appears blurred or visually recognized due to light reflection or the like. There is a problem that this adversely affects the visibility.

An embodiment is to provide a touch panel with improved visibility and a touch device including the same.

The touch panel according to the embodiment includes an electrode substrate; An electrode disposed on the electrode substrate and sensing a position; Wiring electrically connected to the electrode; And a blocking layer disposed on the electrode and blocking a part of light.

A touch device according to an embodiment includes a touch panel; And a driving unit disposed on the touch panel, wherein the touch panel includes: an electrode substrate; An electrode disposed on the electrode substrate and sensing a position; Wiring electrically connected to the electrode; And a blocking layer disposed on the electrode and blocking a part of light.

The touch panel according to the embodiment includes a blocking layer. By blocking the incident of light of a short wavelength through the blocking layer, visibility of the electrode may be improved. In particular, when the electrode includes a connection structure such as a nanowire, the reflectance is about 30% to 80% in the 300 nm to 800 nm wavelength band, which interferes with the visibility. Specifically, in the case of the connection structure, the reflectance may be about 35% to 75% in the 350 nm to 780 nm wavelength band. More specifically, in the case of the connection structure, the reflectance may be about 37% to 70% in the 380 nm to 700 nm wavelength band. Accordingly, by blocking light having a wavelength of 300 nm to 800 nm through the blocking layer, reflectance can be lowered.

In addition, even when the electrode includes a metal vulnerable to light reflection, light reflectance may be lowered through the blocking layer.

Meanwhile, in the touch panel according to another exemplary embodiment, the barrier layer replaces the electrode substrate, thereby improving visibility and reducing the thickness of the touch panel.

1 is an exploded perspective view of a touch panel according to an embodiment.
FIG. 2 is a cross-sectional view taken along line A-A' of FIG. 1.
3 to 5 are cross-sectional views of a touch panel according to another exemplary embodiment.
6 is an exploded perspective view of a touch panel according to another exemplary embodiment.
7 is a cross-sectional view showing a cross-section taken along line B-B' of FIG. 6.
8 is an exploded perspective view of a touch panel according to another exemplary embodiment.
9 is a cross-sectional view illustrating a cross section taken along line C-C' of FIG. 8.
10 is an exploded perspective view of a touch panel according to another exemplary embodiment.
11 is a cross-sectional view illustrating a cross section taken along line D-D' of FIG. 10.
12 is an exploded perspective view of a touch panel according to another embodiment.
13 is a cross-sectional view showing a cross-section taken along E-E' of FIG. 12.
14 to 16 are cross-sectional views of a touch panel according to another exemplary embodiment.
17 to 19 are perspective views of a display device according to an exemplary embodiment.

In the description of the embodiments, each layer (film), region, pattern, or structure is “on” or “under/under” the substrate, each layer (film), region, pad or patterns. The description that "is formed in" includes both directly or through another layer. The criteria for the top/top or bottom/bottom of each layer will be described based on the drawings.

In the drawings, the thickness or size of each layer (film), region, pattern, or structure may be modified for clarity and convenience of description, so the actual size is not entirely reflected.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 and 2, a touch panel according to an embodiment may include a protective substrate 100, an electrode 200, a wiring 300, a printed circuit board 700, and the like.

The protective substrate 100 may include glass or plastic. For example, the protective substrate 100 may include reinforced glass, semi-reinforced glass, soda lime glass, or reinforced plastic.

However, the exemplary embodiment is not limited thereto, and the protective substrate 100 may include various materials capable of supporting the electrode 200, the wiring 300, and the printed circuit board formed thereon. A touch may be made on the upper surface of the protective substrate 100.

An electrode substrate 130 may be disposed under the protective substrate 100. The electrode substrate 130 is a poly (ethylene terephthalate) (PET) film, polycarbonate (PC), COC (Cyclic Olefin Copolymer), COP (Cyclic Olefin Polymer), photoisotropic polycarbonate (polycarbonate). , PC) or photoisotropic polymethyl methacrylate (PMMA).

An electrode 200 may be disposed on the electrode substrate 130. The electrode 200 may serve as a sensor for sensing a touch. in details. A first electrode 210 extending in one direction and a second electrode 220 extending in a direction different from one direction may be disposed on the electrode substrate 130. Meanwhile, in the drawings, for convenience, the difference in thickness between the electrode substrate 130 and the electrode 200 is not significantly different, but there may be more differences in the actual product.

In the drawing, it is shown that the electrode 200 is arranged in a rhombus shape. The embodiment is not limited thereto, and the electrode 200 may be arranged in various shapes such as polygonal, circular, linear H-shaped or elliptical such as a triangle and a square.

Meanwhile, the electrode 200 may include a transparent conductive material to allow electricity to flow without interfering with the transmission of light. For example, the electrode 200 may include indium tin oxide, indium zinc Metal oxides such as indium zinc oxide, copper oxide, tin oxide, zinc oxide, and titanium oxide may be included. In addition, the electrode 200 may include a nanowire, a photosensitive nanowire film, a carbon nanotube (CNT), graphene, a conductive polymer, or various metals. For example, the electrode 200 may be formed of chromium (Cr), nickel (Ni), copper (Cu), aluminum (Al), silver (Ag), molybdenum (Mo), and alloys thereof.

A blocking layer 600 may be disposed between the protective substrate 100 and the electrode substrate 130. That is, the blocking layer 600 may be disposed on the electrode 200. The blocking layer 600 may block a part of light incident into the touch panel. In detail, the blocking layer 600 may block light of a short wavelength. In more detail, the blocking layer 600 may block light having a wavelength of 300 nm to 800 nm. Specifically, the blocking layer 600 may absorb light having a wavelength of 350 nm to 780 nm. Preferably, the blocking layer 600 may absorb light having a wavelength of 380 nm to 700 nm.

The blocking layer 600 may include blocking particles 600a. The blocking particles 600a may include oxides. Specifically, the blocking particles 600a may include at least one of titanium oxide and zinc oxide.

The blocking particles 600a may be dispersed in the base. The base may include a thermoplastic resin.

The titanium oxides may function to absorb and shield light. The titanium oxide may absorb light having a wavelength of 300 nm to 800 nm. Specifically, the titanium oxide may absorb light having a wavelength of 350 nm to 780 nm. Preferably, the titanium oxide may absorb light having a wavelength of 380 nm to 700 nm.

The zinc oxide may scatter light having a wavelength of 300 nm to 800 nm. Specifically, the zinc oxide may absorb light having a wavelength of 350 nm to 780 nm. Preferably, the zinc oxide may absorb light having a wavelength of 380 nm to 700 nm.

In this way, by blocking the incident of light of a short wavelength through the blocking layer 600, the visibility of the electrode 200 may be improved.

Meanwhile, as shown in FIG. 3, the electrode 200 may include an interconnecting structure 222. The connection structure 222 may be a microstructure having a diameter of 5 nm to 300 nm. Specifically, the connection structure 222 may be a microstructure having a diameter of 10 nm to 200 nm. Preferably, as an example, the connection structure 222 may be a microstructure having a diameter of 20 nm to 100 nm. The electrode 200 may include nanowires. The electrode 200 may include a metal nanowire.

Referring to FIG. 4, the electrode 200 may include a base material 221 and a connection structure 222. The base material 221 includes a photosensitive material. Since the base material 221 includes a photosensitive material, the electrode 200 may be formed through processes such as exposure and development.

The electrode 200 may include a photosensitive nanowire film. Since the electrode 200 is formed of a photosensitive nanowire film, the thickness of the electrode 200 may be reduced. That is, while the electrode 200 includes nanowires, the overall thickness may be reduced. Conventionally, when the electrode 200 includes nanowires, an overcoating layer has to be additionally formed to prevent oxidation of the nanowires, which complicates the process and increases the thickness of the touch panel. There was. However, in this embodiment, the nanowires are disposed in the photosensitive material, so that oxidation of the nanowires can be prevented without an overcoat layer.

In particular, in the case of the connection structure, the reflectivity is about 30% to 80% in the 300 nm to 800 nm wavelength band, which interferes with the visibility. Specifically, in the case of the connection structure, the reflectance may be about 35% to 75% in the 350 nm to 780 nm wavelength band. More specifically, in the case of the connection structure, the reflectance may be about 37% to 70% in the 380 nm to 700 nm wavelength band. Accordingly, by blocking light having a wavelength of 300 nm to 800 nm through the blocking layer 600, reflectance may be lowered.

In addition, even when the electrode 200 includes a metal that is vulnerable to light reflection, light reflectivity may be lowered through the blocking layer 600.

Subsequently, the wiring 300 is formed on the electrode substrate 130. The wiring 300 may apply an electrical signal to the electrode 200. The wiring 300 may include a material that is the same as or similar to the material included in the electrode 200.

Meanwhile, a printed circuit board 700 connected to the wiring 300 may be further positioned. As the printed circuit board 700, various types of printed circuit boards may be applied. For example, a flexible printed circuit board (FPCB) may be applied.

Meanwhile, referring to FIG. 5, the blocking layer may include a first blocking layer 610 disposed on the electrode 200 and a second blocking layer 620 disposed under the electrode 200. have. That is, the second blocking layer 620 may be disposed under the electrode substrate 130. Through this, it is possible to prevent light scattering or reflection due to light of a short wavelength incident from the lower portion of the touch panel.

Meanwhile, referring to FIGS. 6 and 7, the first electrode 210 is formed on the first electrode substrate 131 disposed on the protective substrate 100, and the second electrode 220 is It may be formed on the second electrode substrate 132 disposed on the first electrode substrate 131. An optically transparent adhesive may be disposed between the protective substrate 100, the first electrode substrate 131 and the second electrode substrate 132. In addition, a first blocking layer 610 may be disposed on the first electrode substrate 131, and a second blocking layer 620 may be disposed on the second electrode substrate 132.

8 and 9, an intermediate layer 140 may be disposed on the electrode substrate 130. The intermediate layer 140 may be disposed on the second electrode 220. The intermediate layer 140 may support the first electrode 210. At the same time, the intermediate layer 140 may insulate the first electrode 210 and the second electrode 220.

The intermediate layer 140 may include a material different from that of the electrode substrate 130. For example, the intermediate layer 140 may include a dielectric material.

For example, the intermediate layer 140 is an insulator-based halogen compound of an alkali metal or alkaline earth metal such as LiF, KCl, CaF2, MgF2 or fused silica, SiO2, SiNX, and the like; InP, InSb, etc. as a semiconductor series; As a transparent oxide used for semiconductors or dielectrics, In compounds mainly used for the electrode 200 such as ITO and IZO, or transparent oxides used for semiconductors or dielectrics of ZnOx, ZnS, ZnSe, TiOx, WOx, MoOx, ReOx, etc.; Alq3, NPB, TAPC, 2TNATA, CBP, Bphen, etc. as an organic semiconductor series; Silsesquioxane or its derivatives (hydrogen-silsesquioxane (H-SiO3/2)n, methyl-silsesquioxane (CH3-SiO3/2)n), porous silica or fluorine as a low dielectric constant material Alternatively, a carbon atom-doped porous silica, a porous ZnOx, a fluorine-substituted polymer compound (CYTOP), or a mixture thereof may be included. The intermediate layer 140 may have a visible light transmittance of 75% to 99%.

In this case, the thickness of the intermediate layer 140 may be smaller than the thickness of the protective substrate 100. The thickness T2 of the intermediate layer 140 may be smaller than the thickness T1 of the electrode substrate 130. The thickness T2 of the intermediate layer 140 may be 0.01 to 0.95 of the thickness T1 of the electrode substrate 130. Specifically, the thickness T2 of the intermediate layer 140 may be 0.03 to 0.8 of the thickness T1 of the electrode substrate 130. Preferably, the thickness T2 of the intermediate layer 140 may be 0.05 to 0.5 of the thickness T1 of the electrode substrate 130. For example, when the thickness T1 of the electrode substrate 130 is 0.05 mm, the thickness T2 of the intermediate layer 140 may be 0.005 mm.

The intermediate layer 140 may be directly formed on the upper surface of the electrode substrate 130. That is, the intermediate layer 140 may be formed by directly applying a dielectric material on the upper surface of the electrode substrate 130. Thereafter, the first electrode 210 may be formed on the intermediate layer 140.

By securing a thin thickness of the touch panel through the intermediate layer 140, transmittance may be improved, and cracks of the first electrode 210 and the second electrode 220 may be prevented. Accordingly, it is possible to improve the bending characteristics and reliability of the touch panel.

Meanwhile, referring to FIGS. 10 and 11, the first electrode 210 is formed on one surface of the electrode substrate 130 disposed on the protective substrate 100, and the second electrode 220 is the electrode It may be formed on the other surface of the substrate 130. Through this, the thickness of the touch panel can be reduced.

Meanwhile, referring to FIGS. 12 and 13, the first electrode 210 is formed on one surface of the protective substrate 100, and the second electrode 220 is an electrode substrate disposed on the protective substrate 100. It may be formed on one side of (130). An optical transparent adhesive 500 may be disposed between the protective substrate 100 and the electrode substrate 130. In this case, the blocking layer 600 may be disposed on the protective substrate 100.

Meanwhile, referring to FIG. 14, the blocking layer 650 may serve as the electrode substrate. That is, the electrode 200 and the wiring 300 may be directly disposed on the blocking layer 650. The blocking layer 650 may be disposed between the touched surface of the protective substrate 100 and the electrode 200. Accordingly, the electrode 200 may be disposed on the lower surface of the blocking layer 650. That is, the protective substrate 100, the blocking layer 650, and the electrode 200 may be sequentially stacked. Through this, it is possible to secure a thinner thickness of the touch panel. Meanwhile, an optically transparent adhesive 500 may be further disposed between the protective substrate 100 and the blocking layer 650.

In this case, the blocking layer 650 may include a base and a dye disposed within the base. The base may include any one of polyethylene terephthalate (PET), polycarbonate polycarbonate (PC), Cyclic Olefin Copolymer (COC), and Cyclic Olefin Polymer (COP). In addition, the dye may include any one material selected from the group consisting of azo dyes, disperse dyes, and phthalocyanine dyes.

Visibility may be improved through the blocking layer 650 and the thickness of the touch panel may be reduced by replacing the electrode substrate.

Referring to FIG. 15, the first electrode 210 is formed on the first blocking layer 651 disposed on the protective substrate 100, and the second electrode 220 is the first blocking layer ( It may be formed on the second blocking layer 652 disposed on the 651. An optically transparent adhesive 500 may be disposed between the protective substrate 100, the first blocking layer 651 and the first blocking layer 651.

Referring to FIG. 16, an intermediate layer 140 may be disposed on the blocking layer 650. The intermediate layer 140 may be disposed on the second electrode 220. The intermediate layer 140 may support the first electrode 210.

Such a touch panel may be disposed on a display panel that is a driver. The touch panel and the display panel are bonded together to form a display device. As shown in FIG. 6, such a display device may be a mobile terminal.

In particular, as shown in FIG. 17, the touch panel may include a curved touch panel. Accordingly, the display device including the same may be a curved display device.

The display panel has a display area for outputting an image. A display panel applied to such a display device may generally include an upper substrate and a lower substrate. A data line, a gate line, and a thin film transistor (TFT) may be formed on the lower substrate. The upper substrate may be bonded to the lower substrate to protect components disposed on the lower substrate.

The display panel may be formed in various shapes depending on what kind of display device the display device according to the present invention is. That is, the display device according to the present invention includes a liquid crystal display (LCD), a field emission display, a plasma display (PDP), an organic light emitting display (OLED), and an electrophoretic display (EPD). Accordingly, the display panel may be configured in various forms.

Meanwhile, referring to FIG. 18, the touch panel may include a flexible touch panel that is bent. Accordingly, the display device including the same may be a flexible display device. Thus, the user can bend or bend it by hand.

Meanwhile, referring to FIG. 19, such a touch panel may be applied not only to a display device such as a mobile terminal but also to a vehicle. Although a car navigation is shown in the drawing, the embodiment is not limited thereto. Therefore, it is applied not only to the PND (Personal Navigation Display), but also to an instrument panel (dashboard) to implement a CID (Center Information Display). However, the embodiment is not limited thereto, and of course, such a display device may be used in various electronic products.

Features, structures, effects, and the like described in the above-described embodiments are included in at least one embodiment of the present invention, and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, and the like illustrated in each embodiment may be combined or modified for other embodiments by a person having ordinary knowledge in the field to which the embodiments belong. Accordingly, contents related to such combinations and modifications should be construed as being included in the scope of the present invention.

In addition, although the embodiments have been described above, these are only examples and do not limit the present invention, and those of ordinary skill in the field to which the present invention pertains are illustrated above within the scope not departing from the essential characteristics of the present embodiment. It will be seen that various modifications and applications that are not available are possible. For example, each component specifically shown in the embodiments can be modified and implemented. And differences related to these modifications and applications should be construed as being included in the scope of the present invention defined in the appended claims.

Claims (18)

Electrode substrate;
An electrode disposed on the electrode substrate;
A protective substrate on the electrode substrate;
An adhesive between the electrode substrate and the protective substrate; And
Comprising a blocking layer between the protective substrate and the electrode substrate,
The blocking layer blocks light of 300 nm to 800 nm wavelength,
The electrode,
A first electrode disposed on one surface of the electrode substrate and extending in one direction;
A second electrode disposed on the other surface of the electrode substrate and extending in a direction different from the one direction; And
A wiring including a first wiring connected to the first electrode and a second wiring connected to the second electrode,
The first wiring and the second wiring are disposed on different surfaces,
The first electrode and the second electrode include a metal nanowire. The method of claim 1,
The blocking layer includes a base and a dye disposed in the base. The method of claim 1,
The electrode substrate is a touch panel comprising any one of polyethylene terephthalate (PET), polycarbonate polycarbonate (PC), Cyclic Olefin Copolymer (COC), and Cyclic Olefin Polymer (COP). Display panel; And
A touch device comprising the touch panel of any one of claims 1 to 3 disposed on the display panel. The method of claim 4,
The touch panel includes a curved touch panel or a flexible touch panel. delete delete delete delete delete delete delete delete delete delete delete delete delete

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