WO2015196678A1

WO2015196678A1 - Flexible touch substrate and touch display device

Info

Publication number: WO2015196678A1
Application number: PCT/CN2014/089828
Authority: WO
Inventors: 曾庆慧; 藤野诚治
Original assignee: 京东方科技集团股份有限公司
Priority date: 2014-06-27
Filing date: 2014-10-29
Publication date: 2015-12-30
Also published as: CN104166475A

Abstract

Provided are a flexible touch substrate and a touch display device. The flexible touch substrate (2) comprises a flexible underlayment (21); and a touch sensing unit comprising two sensing layers (22, 23), wherein at least one sensing layer is located inside the flexible underlayment (21). According to the flexible touch substrate and touch display device in the embodiments of the present invention, the touch sensing unit is manufactured inside the flexible underlayment, so that a touch effect of high sensitivity can be realized, thereby obtaining a touchscreen having a relatively thin thickness and high sensitivity and realizing the in-cell touch technology easily.

Description

Flexible touch substrate and touch display device

Technical field

Embodiments of the present invention relate to a flexible touch substrate and a touch display device.

Background technique

With the development of display technology, electronic products such as mobile phones, tablets, and even televisions require touch functions.

According to the working principle and the medium for transmitting information, the touch screen is generally divided into four types: resistive, capacitive, sonic and infrared. Depending on the installation method, the touch screen is generally classified into an add-on, an in-cell, an on-cell, and an One Glass Solution (OGS). Among them, the in-cell method has the advantages of being lighter and thinner because it can reduce one layer of substrate, and reduces the adverse effect on the display contrast due to the refraction, reflection, etc. of the light at the interface due to the reduction of the substrate, thereby achieving contrast. Higher display.

Summary of the invention

Embodiments of the present invention provide a flexible touch substrate and a touch display device, which are capable of obtaining a touch screen and a touch display device which are thin in thickness, improved in sensitivity, and easy to implement in-cell touch technology.

In one aspect, embodiments of the present invention provide a flexible touch substrate comprising: a flexible substrate; and a touch sensing unit comprising two sensing layers, wherein at least one sensing layer is located inside the flexible substrate.

In still another aspect, the present invention also provides a touch display device comprising the above flexible touch substrate.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below. It is obvious that the drawings in the following description relate only to some embodiments of the present invention, and are not intended to limit the present invention. .

1 is a cross-sectional structural view of a flexible touch substrate according to a first embodiment of the present invention;

2 is a cross-sectional view showing steps of a method for fabricating a flexible touch substrate according to Embodiment 1 of the present invention;

3 is a cross-sectional structural view of a flexible touch substrate according to a second embodiment of the present invention;

4 is a cross-sectional structural view of a flexible touch substrate according to a third embodiment of the present invention;

5 is a cross-sectional structural view of a touch display device according to a fourth embodiment of the present invention;

6 is a cross-sectional structural view of a touch display device according to a fifth embodiment of the present invention;

7 is a cross-sectional structural view of a touch display device according to Embodiment 6 of the present invention;

Figure 8 is a cross-sectional structural view of a touch display device in accordance with a seventh embodiment of the present invention.

detailed description

The technical solutions of the embodiments of the present invention will be clearly and completely described in the following with reference to the accompanying drawings. It is apparent that the described embodiments are part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the described embodiments of the present invention without departing from the scope of the invention are within the scope of the invention.

Embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. The following examples are not intended to limit the scope of the embodiments of the invention.

Embodiments of the present invention provide a flexible touch substrate including a flexible substrate and a touch sensing unit, the touch sensing unit including two sensing layers, wherein at least one sensing layer is located on the flexible substrate internal.

Embodiment 1

Illustratively, as shown in FIG. 1, the two sensing layers are a first sensing layer 22 and a second sensing layer 23, respectively, and the first sensing layer 22 and the second sensing layer 23 are both flexible. Inside the substrate 21, the first sensing layer 22 and the second sensing layer 23 in this embodiment are located in different layers inside the flexible substrate 21.

The manufacturing method of the flexible touch substrate in this embodiment is as follows:

As shown in FIG. 2, a polyimide (PI) solution is first coated on a carrier 1 (for example, glass, quartz, plastic), and then dried to form a first PI layer 211 and a first one is prepared thereon. The sensing layer 22, the first sensing layer 22 can be, for example, a first-direction metal conductive layer as a touch sensing layer, then coated with a PI liquid, dried to form a second PI layer 212, and continue to prepare a second thereon. The sensing layer 23, the second sensing layer 23 can adopt, for example, a second direction metal conductive layer as a touch sensing layer, wherein the extending directions of the first direction metal conductive layer and the second direction metal conductive layer cross each other and continue to be coated. PI liquid, Finally, the third PI layer 213 is formed to be baked, and then sintered so that the first PI layer 211, the second PI layer 212, and the third PI layer 213 are integrated, thereby forming the flexible substrate 21, thereby obtaining the touch sensing unit located in the lining. The structure inside the bottom 2. Finally, the flexible substrate is peeled off from the carrier 1 to finally obtain a flexible touch substrate 2 in which the touch sensing unit is located inside the flexible substrate. The flexible touch substrate can function as a flexible touch screen.

The flexible touch substrate provided by the embodiment provides the touch sensing unit to the inside of the flexible substrate, thereby achieving a high sensitivity touch effect, and realizing a flexible touch screen with reduced thickness, improved sensitivity, and easy implementation of in-cell touch technology. .

Embodiment 2

As shown in FIG. 3, the difference between this embodiment and the first embodiment is that the first sensing layer 22 and the second sensing layer 23 in the embodiment are located in the same layer inside the flexible substrate 21.

First, a layer of PI liquid is coated on a carrier plate (for example, glass, quartz, plastic), and then dried to form a PI layer and a touch sensing first sensing layer and a second sensing layer are prepared thereon. A sensing layer and a second sensing layer are located in the same layer, the first sensing layer is a first direction metal guiding layer, and the second sensing layer is a second direction metal guiding layer, wherein the first direction metal guiding layer and the first direction The extending directions of the two-direction metal guiding layers are mutually intersected, and then the PI liquid is coated, dried to form another PI layer, and then sintered to make the two PI layers integrated, and the touch sensing unit is obtained inside the substrate. structure. Finally, the flexible substrate is peeled off from the carrier, and finally a flexible touch substrate in which the touch sensing unit is located inside the flexible substrate is obtained. The flexible touch substrate can be used as a flexible touch screen.

The flexible touch substrate provided by the embodiment provides the touch sensing unit to the inside of the flexible substrate, thereby achieving a highly sensitive touch effect, realizing a flexible touch screen with reduced thickness, improved sensitivity, and easy implementation of in-cell touch technology. .

Embodiment 3

As shown in FIG. 4, the difference between this embodiment and the first embodiment is that one of the two sensing layers in the embodiment is located inside the flexible substrate, and the other sensing layer is located in the flexible layer. On the outer surface of the substrate. For example, the first sensing layer 22 is located inside the flexible substrate and the second sensing layer 23 is located on the upper surface of the flexible substrate.

First, apply a layer of PI solution on a carrier (eg glass, quartz, plastic) and then dry it. Forming a PI layer and preparing a first sensing layer in the touch sensing unit thereon, then coating the PI liquid, drying to form another PI layer, and then sintering to make the two PI layers integrated to obtain a flexible substrate 21, then a second sensing layer is prepared on the flexible substrate 21, and finally, the flexible substrate is peeled off from the carrier to obtain a structure in which the partial touch sensing layer is inside the flexible substrate.

Embodiment 4

The embodiment provides a touch display device comprising the flexible touch substrate as described in any of the above embodiments.

Illustratively, as shown in FIG. 5, the display device includes: the flexible touch substrate 2, the flexible touch substrate 2 includes a flexible substrate 21 and two sensing layers, and the two sensing layers are respectively first The sensing layer 22 and the second sensing layer 23, the first sensing layer and the second sensing layer are both located inside the flexible substrate 21, and the flexible touch substrate further includes a TFT device 3 and an organic light emitting (EL) Device 4 and protective film 5. 2 is a flexible touch substrate, 21 is a flexible substrate, 22 is a first sensing layer, 23 is a second sensing layer, 3 is a TFT device, and 4 is an EL device.

The first sensing layer and the second sensing layer in this embodiment may be fabricated, for example, by using a transparent conductive material such as indium tin oxide (ITO). The TFT device may be an oxide TFT, an organic TFT, or a low temperature polysilicon (LTPS). Thin film transistor, etc.

For the manufacturing method of the above display device, a part of the reference device can be referred to as follows:

Coating a layer of PI liquid on a carrier (eg glass, quartz, plastic), then drying to form a first PI layer and preparing a first sensor layer of the touch sensing unit thereon, then coating the PI liquid and baking Drying to form a second PI layer, continuing to form a second sensor layer in the touch sensing unit on the second PI layer, and then continuing to apply PI liquid, drying to form a third PI layer, and then sintering The first PI layer, the second PI layer, and the third PI layer are integrated to form a flexible substrate. The TFT substrate, the OLED device and the protective film are further prepared on the flexible substrate. Finally, the flexible substrate is peeled off from the carrier to obtain an in-cell touch OLED display in which the touch sensing unit is located inside the flexible substrate.

It should be noted that the first sensing layer and the second sensing layer in this embodiment may be made of a transparent conductive material, for example, or may be made of other metal layers.

In addition, an isolation layer may be disposed between the first sensing layer and the second sensing layer, and the isolation layer may be made of SiNx.

The above display device is manufactured as follows:

First, a layer of PI liquid is coated on a carrier (such as glass, quartz, plastic), and then dried to form a first PI layer and a first metal layer in the touch sensing unit is prepared thereon, and then an isolation layer is prepared. SiNx, followed by preparation of the second metal layer in the touch sensing unit, followed by coating the PI liquid, drying to form a second PI layer, and then sintering to integrate the first PI layer and the second PI layer, thereby A flexible substrate is formed and the touch sensing unit is located inside the flexible substrate. The TFT substrate and the OLED device are further fabricated on the flexible substrate. Finally, the flexible substrate is peeled off from the carrier to obtain an in-cell touch OLED display with the touch sensing unit inside the flexible substrate.

The embodiment of the present invention solves the in-cell touch by disposing the touch sensing unit inside the flexible substrate and then preparing the TFT device and the OLED device on the flexible substrate, thereby obtaining an OLED display device with high sensitivity and high sensitivity. Display technology is difficult to achieve technical problems with low yield.

Embodiment 5

As shown in FIG. 6, an embodiment of the present invention provides a touch display device. The display device includes the flexible touch substrate according to any of the above embodiments, a color filter layer is disposed on the flexible touch substrate to form a touch color film substrate, the device further includes an array substrate, the touch color film substrate and the array substrate There is a liquid crystal between them. Wherein, 2 is a touch color film substrate, 21 is a flexible substrate, 22 is a first sensing layer, 23 is a second sensing layer, 24 is a color filter layer, 3 is a liquid crystal layer, and 4 is a thin film transistor formed therein The array substrate, 5 is the backlight.

In this embodiment, a color filter layer is formed on a flexible touch substrate to form a new touch color film substrate, which can reduce the thickness of 1-1.4 micrometers compared with the prior art, and thus, a thinner and lighter device can be obtained. Moreover, since the touch sensing unit is far away from the thin film transistor and does not interfere with each other, the signal to noise ratio of the present embodiment is higher. At the same time, since the preparation of the touch sensing unit does not affect the fabrication of the TFT, the yield of the present embodiment is higher than that of the conventional in-cell touch technology.

The method for manufacturing the touch display device in this embodiment is as follows:

First, a layer of PI liquid is coated on a carrier (eg, glass, quartz, plastic), and then dried to form a first PI layer and a first sensor layer of the touch sensing unit is prepared thereon, and then the PI liquid is coated. And drying to form a second PI layer, continuing to form a second sensor layer in the touch sensing unit on the second PI layer, and then continuing to apply PI liquid, drying to form a third PI layer, and then forming Sintering causes the first PI layer, the second PI layer, and the third PI layer to be integrated to form a flexible substrate. Then, a color filter is formed on the flexible substrate to obtain a touch color film substrate, and the touch color film substrate is to be The substrate formed with the TFT is bonded to the liquid crystal, and finally the flexible substrate is peeled off from the carrier to obtain an in-cell touch LCD display in which the touch sensing unit is inside the flexible substrate.

Embodiment 6

As shown in FIG. 7 , an embodiment of the present invention provides a touch display device, including the flexible touch substrate according to any of the above embodiments, having an In-cell OLED top emission structure.

Illustratively, the display device comprises a flexible touch substrate 2 comprising a flexible substrate 21 and a touch sensing unit, the first sensing layer 22 and the second sensing layer 23 of the touch sensing unit being located in a flexible Inside the substrate 21, a water-blocking oxygen film 24 is prepared on the lower surface of the flexible substrate, and the flexible touch substrate 2 and the water-blocking oxygen film 24 together form a water-blocking oxygen-proof plate having a touch function as an upper package substrate of the OLED device. Thus, an in-cell type OLED display device is constructed. Wherein, 11 is TFT, 12 is EL, 13 is package film (TFE), 2 is flexible touch substrate, 21 is flexible substrate, 22 is first sensing layer, 23 is second sensing layer, 24 is water blocking Oxygen film.

The touch display device in this embodiment is manufactured by first coating a layer of PI liquid on a carrier (eg, glass, quartz, plastic), then drying to form a first PI layer and preparing a touch sensing unit thereon. The first sensor layer is then coated with PI liquid and dried to form a second PI layer, and the second sensor layer in the touch sensing unit is further formed on the second PI layer, and then the PI liquid is continuously coated. Drying is performed to form a third PI layer, which is then sintered so that the first PI layer, the second PI layer, and the third PI layer are integrated to form a flexible substrate, and then a water-blocking oxygen film is formed on the flexible substrate. The substrate having a touch function and a water-blocking oxygen function serves as an upper package substrate of the OLED display device, thereby obtaining an in-cell touch OLED display.

It should be noted that the PI liquid can also be replaced by a polyethylene naphthalate (PEN) solution. In addition, the first sensing layer and the second sensing layer may be a conductive layer or a light sensitive layer.

The touch display device provided by the embodiment provides the touch sensing unit to the inside of the water blocking oxygen plate of the display device, thereby obtaining a touch OLED display device with high sensitivity, lightness and good display effect, and solving the in-cell touch display technology. The technical problems of high difficulty and low yield are very beneficial to the preparation of flexible display devices.

Example 7

As shown in FIG. 8, an embodiment of the present invention provides a touch display device, such as the flexible touch substrate described in any of the embodiments.

Illustratively, the display device includes: a flexible touch substrate 2 including a flexible substrate 21 And a touch sensing unit, the first sensing layer 22 and the second sensing layer 23 in the touch sensing unit are located inside the flexible substrate 21. The surface of the flexible touch substrate is provided with a color filter layer and a water blocking oxygen film, and a flexible touch substrate having a touch, water blocking oxygen and filtering function is used as an upper package substrate of the OLED device, thereby forming an in-cell type WOLED-CF. (White OLED and color filter) display device. Wherein, 1 is a lower substrate; 11 is a TFT; 12 is an EL; 13 is a package film (TFE); 2 is an upper package substrate; 21 is a flexible substrate; 24 is a color filter layer; 25 is a water blocking oxygen film.

The touch display device in this embodiment is manufactured by coating a layer of PI liquid on a carrier (eg, glass, quartz, plastic), and then drying to form a first PI layer and preparing a touch sensing unit thereon. The first sensor layer is then coated with the PI liquid and dried to form a second PI layer, and the second sensor layer in the touch sensing unit is further formed on the second PI layer, and then the PI liquid is continuously applied. Drying to form a third PI layer, and then sintering to integrate the first PI layer, the second PI layer and the third PI layer, thereby forming a flexible substrate on which a color filter layer is formed, and then a resist is formed The water oxygen film is then peeled off from the carrier, and finally the substrate is bonded to the substrate on which the TFT and the EL device are formed, thereby obtaining an in-cell OLED display device.

In this embodiment, the touch sensing unit is formed into the interior of the water blocking oxygen plate, and the color of the color filter is disposed on the same side of the water blocking oxygen film, so that the same substrate has three functions of touch, water blocking oxygen and color filter. The obtained display device has the characteristics of high sensitivity, lightness and thinness, good display effect, etc., and solves the technical problem that the in-cell touch display technology is difficult and has low yield, and is also beneficial for the preparation of the flexible display device.

Embodiments of the present invention provide a flexible touch substrate and a touch display device, and the touch sensing unit is fabricated into the flexible substrate to achieve a highly sensitive touch effect, and the touch screen has a thick thickness, low sensitivity, and in- Cell touch technology achieves difficult technical problems.

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

The present application claims the priority of the Chinese Patent Application No. 201410301611.X filed on Jun. 27, 2014, the entire disclosure of which is hereby incorporated by reference.

Claims

A flexible touch substrate comprising:

Flexible substrate;

The touch sensing unit includes two sensing layers, at least one of which is located inside the flexible substrate.
The flexible touch substrate of claim 1 , wherein the two sensing layers are respectively a first sensing layer and a second sensing layer, wherein the first sensing layer and the second sensing layer are both located in the The inside of the flexible substrate.
The flexible touch substrate of claim 2 wherein the first sensing layer and the second sensing layer are located in different layers inside the flexible substrate.
The flexible touch substrate of claim 2, wherein the first sensing layer and the second sensing layer are in the same layer inside the flexible substrate.
The flexible touch substrate of claim 1 wherein one of said two sensing layers is located inside said flexible substrate and the other sensing layer is external to said flexible substrate.
The flexible touch substrate of claim 1, wherein the further one of the sensing layers is formed on a surface of the flexible substrate.
The flexible touch substrate according to any one of claims 1 to 6, wherein the two sensing layers comprise a first direction metal guiding layer and a second direction metal guiding layer extending in a direction intersecting each other.
A touch display device comprising the flexible touch substrate according to any one of claims 1-6.
The touch display device according to claim 8, wherein a thin film transistor and an organic light emitting device are further formed on the flexible touch substrate.
The touch display device of claim 8, wherein a color filter layer is formed on the flexible touch substrate to obtain a touch color film substrate, the device further comprising an array substrate, the touch color film substrate and the array substrate after the box Inject liquid crystal.
The touch display device according to claim 8, wherein a water blocking oxygen film layer is provided on the flexible touch substrate.
The touch display device of claim 11, wherein the first sensing layer and the second sensing layer are light sensitive layers.
The touch display device according to claim 8, wherein a water blocking oxygen film layer and a color filter layer are further formed on the flexible touch substrate.
The touch display device of claim 13, wherein the first sensing layer and the second sensing layer are conductive layers.
The touch display device of claim 13, wherein the first sensing layer and the second sensing layer are light sensitive layers.