阅读说明：本技术 阵列基板和显示面板 (Array substrate and display panel ) 是由 周阳 于 2019-08-20 设计创作，主要内容包括：本发明提供一种阵列基板和显示面板。种阵列基板定义有弯折区和非弯折区。所述非弯折区包括层叠设置的柔性衬底层、复合缓冲层、源漏极层、平坦层和像素定义层；所述弯折区包括层叠设置的柔性衬底层、源漏极层、平坦层和像素定义层,或者位于所述弯折区的所述复合缓冲层的厚度小于位于所述非弯折区的所述复合缓冲层的厚度。显示面板包括上述阵列基板。本发明通过减少金属走线与基板之间的距离,使所述源漏极层接近甚至达到应力平衡线,从而让金属走线减少受到的应力,甚至基本不受自身应力。金属走线不受应力,则其断裂风险降低,屏幕的耐弯折能力上升。(The invention provides an array substrate and a display panel. The array substrate is defined with a bending area and a non-bending area. The non-bending area comprises a flexible substrate layer, a composite buffer layer, a source drain layer, a flat layer and a pixel definition layer which are arranged in a stacked mode; the bending area comprises a flexible substrate layer, a source drain layer, a flat layer and a pixel definition layer which are arranged in a stacked mode, or the thickness of the composite buffer layer located in the bending area is smaller than that of the composite buffer layer located in the non-bending area. The display panel comprises the array substrate. According to the invention, the distance between the metal wire and the substrate is reduced, so that the source drain layer is close to or even reaches the stress balance line, and the stress on the metal wire is reduced or even is not basically applied. The metal wires are not stressed, so that the fracture risk is reduced, and the bending resistance of the screen is improved.)

1. An array substrate is defined with a bending area and a non-bending area, wherein the non-bending area comprises

A flexible substrate layer;

a composite buffer layer on the flexible substrate layer;

the source drain layer is positioned on the composite buffer layer;

the flat layer is positioned on the source drain layer; and

a pixel defining layer on the planarization layer;

characterized in that the bending zone comprises

The flexible substrate layer;

the source drain layer is positioned on the flexible substrate layer;

the flat layer is positioned on the source drain layer; and

the pixel defining layer is located on the flat layer.

2. The array substrate of claim 1, wherein an organic layer is further disposed on a side of the composite buffer layer corresponding to the bending region; the non-bending region further comprises an organic layer, the organic layer is adjacent to the bending region, one part of the organic layer covers the composite buffer layer, and the other part of the organic layer is formed on the flexible substrate layer.

3. The array substrate of claim 2, wherein the source drain layer covers the organic layer.

4. The array substrate of claim 2, wherein the material of the organic layer comprises an oxidative dehydro-organic, a polyimide resin, or a siloxane.

5. The array substrate of claim 1,

the composite buffer layer comprises

A buffer layer on the flexible substrate layer; and

a barrier layer on the buffer layer;

wherein the source drain layer is located on the barrier layer.

6. The array substrate of claim 1, wherein the material of the flexible substrate layer is polyimide.

7. The array substrate of claim 1, further comprising a support layer on the pixel definition layer.

8. The array substrate of claim 1, further comprising a light emitting layer on the pixel defining layer of the non-bending region.

9. An array substrate is defined with a bending area and a non-bending area and comprises

A flexible substrate layer;

a composite buffer layer on the flexible substrate layer;

the source drain layer is positioned on the composite buffer layer;

the flat layer is positioned on the source drain layer; and

a pixel defining layer on the planarization layer;

it is characterized in that the preparation method is characterized in that,

the thickness of the composite buffer layer positioned in the bending area is smaller than that of the composite buffer layer positioned in the non-bending area.

10. A display panel comprising the array substrate according to any one of claims 1 to 9.

Technical Field

The invention relates to the field of display, in particular to an array substrate and a display panel.

Background

With the explosion of Organic Light Emitting Diode (OLED) industry, foldable products are becoming popular, and the bending technology therein becomes a bottleneck restricting further development of the products.

As shown in fig. 1, fig. 1 is a schematic structural view of a conventional array substrate after being bent. The array substrate 90 includes a bending region 91 and a non-bending region 92, and the array substrate 90 includes a flexible substrate layer 901, a composite buffer layer 902, a source drain layer 903, a planarization layer 904, and a pixel definition layer 905, which are stacked. Usually, after the bending region 91 is bent, the thickness of the array substrate 90 is generally 12-20um, the thickness of the metal trace (i.e., the source/drain layer 903) located in the bending region 91 is 0.6-1um, the thickness of the film layer on the metal trace is generally about 3-4um, as shown by a dotted line in fig. 1, a bent stress balance line (also called a neutral plane) 93 is shown, where the stress balance line 93 does not have a compressive stress or a tensile stress during bending, and the stress at the position is zero. However, after bending, the stress balance line 93 is on the lower side of the source/drain layer, so that the metal trace in the bending region generates stress, and is prone to crack or break.

In the prior art, to solve the above problem, when the bending region is bent, the bending angle is generally in a symmetrical and smooth curve. However, due to the influence of insufficient bending process capability, external interference, etc., the bending angle is not in an ideal state, and the bending angle is deformed inward or deviated to one side, so that the stress concentration of the source/drain layer in the bending region is increased, cracks or fractures are generated, and the cracks penetrate through the whole cross section of the circuit after extending, so that signal transmission fails, and the picture is abnormal.

If the line crack is not solved, the yield cannot be guaranteed, and the mass production is not feasible. Therefore, there is a need for a new array substrate and display panel to overcome the problems in the prior art.

Disclosure of Invention

The invention aims to provide an array substrate and a display panel, wherein the source and drain electrode layers are close to or even reach a stress balance line by reducing the distance between a metal wire and the substrate, so that the metal wire reduces the self stress and even basically generates no stress. The metal wires have no stress, so the fracture risk is reduced, and the bending resistance of the screen is improved.

In order to solve the above problems, an embodiment of the invention provides an array substrate, which is defined with a bending region and a non-bending region. The non-bending area comprises a flexible substrate layer, a composite buffer layer, a source drain layer, a flat layer and a pixel definition layer which are arranged in a stacked mode; in particular, the composite buffer layer is located on the flexible substrate layer; the source drain layer is positioned on the composite buffer layer; the flat layer is positioned on the source drain layer; the pixel defining layer is located on the flat layer. The bending area comprises a flexible substrate layer, a source drain layer, a flat layer and a pixel definition layer which are arranged in a stacked mode; specifically, the source drain layer is positioned on the flexible substrate layer; the flat layer is positioned on the source drain layer; the pixel defining layer is located on the flat layer.

Further, an organic layer is arranged on one side of the composite buffer layer corresponding to the bending region; the non-bending region further comprises an organic layer, the organic layer is adjacent to the bending region, one part of the organic layer covers the multi-buffer layer, and the other part of the organic layer is formed on the flexible substrate layer.

Further, the source drain layer covers the organic layer.

Further wherein the material of the organic layer comprises an oxydehydrogenated organic, a polyimide resin, or a siloxane.

Further wherein the composite buffer layer comprises a buffer layer and a barrier layer disposed in a stack. In particular, the buffer layer is located on the flexible substrate layer; the barrier layer is positioned on the buffer layer; wherein the source drain layer is located on the barrier layer.

Further, the material of the flexible substrate layer is polyimide.

Further, a support layer is further included on the pixel definition layer.

Further, the pixel defining layer located in the non-bending region further includes a light emitting layer.

The invention provides an array substrate, which is defined with a bending area and a non-bending area and comprises a flexible substrate layer, a composite buffer layer, a source drain layer, a flat layer and a pixel definition layer which are arranged in a stacked mode; in particular, the composite buffer layer is located on the flexible substrate layer; the source drain layer is positioned on the composite buffer layer; the flat layer is positioned on the source drain layer; the pixel defining layer is located on the flat layer. Wherein the thickness of the composite buffer layer in the bending region is smaller than that in the non-bending region.

In another embodiment of the present invention, a display panel is provided, which includes the array substrate described above.

The array substrate and the display panel have the beneficial effects that the source drain electrode layer is close to or even reaches the stress balance line by reducing the distance between the metal wiring and the substrate, so that the stress applied to the metal wiring is reduced, and even the stress is not applied to the metal wiring basically. The metal wiring is not stressed, so that the fracture risk is reduced, and the bending resistance of the screen is improved.

Drawings

The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.

Fig. 1 is a schematic structural view of an array substrate after being bent according to the prior art;

fig. 2 is a schematic structural diagram of an array substrate according to a first embodiment of the invention;

fig. 3 is a schematic structural view of the array substrate in fig. 2 after being bent;

FIG. 4 is a schematic view of an array substrate according to a second embodiment of the present invention;

fig. 5 is a schematic structural view of the array substrate in fig. 4 after being bent;

fig. 6 is a schematic view of an array substrate according to a third embodiment of the invention.

The components in the figure are identified as follows:

1. a flexible substrate layer, 2, a composite buffer layer, 3, a source drain layer, 4, a flat layer,

5. a pixel defining layer, 6, a support layer, 7, a light emitting layer, 8, an organic layer,

10. a bending region, 20, a non-bending region, 21, a buffer layer, 22, a barrier layer,

30. stress balance line, 100, array substrate.

Detailed Description

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In one embodiment of the present invention, an array substrate is provided, which defines a bending region and a non-bending region. The non-bending area comprises a flexible substrate layer, a composite buffer layer, a source drain layer, a flat layer and a pixel definition layer which are arranged in a stacked mode; in particular, the composite buffer layer is located on the flexible substrate layer; the source drain layer is positioned on the composite buffer layer; the flat layer is positioned on the source drain layer; the pixel defining layer is located on the flat layer. The bending area comprises a flexible substrate layer, a source drain layer, a flat layer and a pixel definition layer which are arranged in a stacked mode; specifically, the source drain layer is positioned on the flexible substrate layer; the flat layer is positioned on the source drain layer; the pixel defining layer is located on the flat layer.

Preferably, an organic layer is further disposed on one side of the composite buffer layer corresponding to the bending region; the non-bending region further comprises an organic layer, the organic layer is adjacent to the bending region, one part of the organic layer covers the multi-buffer layer, and the other part of the organic layer is formed on the flexible substrate layer.

Preferably, the source drain layer covers the organic layer.

Preferably, the material of the organic layer includes an oxidative dehydroorganic, a polyimide resin, or siloxane.

Preferably, the composite buffer layer comprises a buffer layer and a barrier layer arranged in a stack. In particular, the buffer layer is located on the flexible substrate layer; the barrier layer is positioned on the buffer layer; wherein the source drain layer is located on the barrier layer.

Preferably, the material of the flexible substrate layer is polyimide.

Preferably, a support layer is further included on the pixel defining layer.

Preferably, the pixel defining layer located in the non-bending region further includes a light emitting layer.

The invention provides an array substrate, which is defined with a bending area and a non-bending area and comprises a flexible substrate layer, a composite buffer layer, a source drain layer, a flat layer and a pixel definition layer which are arranged in a stacked mode; in particular, the composite buffer layer is located on the flexible substrate layer; the source drain layer is positioned on the composite buffer layer; the flat layer is positioned on the source drain layer; the pixel defining layer is located on the flat layer. Wherein the thickness of the composite buffer layer in the bending region is smaller than that in the non-bending region.

In another embodiment of the present invention, a display panel is provided, which includes the array substrate described above.

More detailed examples are described below: