CN110085123B

CN110085123B - Array substrate and display panel

Info

Publication number: CN110085123B
Application number: CN201910357147.9A
Authority: CN
Inventors: 张成成; 高孝裕; 田汝强; 张九占; 朱晖
Original assignee: Kunshan New Flat Panel Display Technology Center Co Ltd; Kunshan Govisionox Optoelectronics Co Ltd
Current assignee: Kunshan New Flat Panel Display Technology Center Co Ltd; Kunshan Govisionox Optoelectronics Co Ltd
Priority date: 2019-04-29
Filing date: 2019-04-29
Publication date: 2021-10-08
Anticipated expiration: 2039-04-29
Also published as: CN110085123A

Abstract

The embodiment of the invention discloses an array substrate and a display panel. The array substrate includes: the substrate comprises a display area and a bending area arranged on at least one side of the display area; the bending area comprises a plurality of signal wires; along the direction perpendicular to the extending direction of the signal wire, a first side of the cross section of the signal wire, which is far away from the substrate, is a curve. The embodiment of the invention improves the bending resistance of the signal wiring, thereby ensuring that the display panel has higher display performance.

Description

Array substrate and display panel

Technical Field

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

Background

As display products have become more popular, users have made higher demands on the appearance, structure, and the like of the display products, and therefore, display panels with a narrow frame or without a frame have come to be used as needed. A narrow-bezel or frameless display panel is realized by bending the non-display portion of the panel to the back of the panel. However, during the bending process, a portion of the signal lines in the bending region may be broken, which affects the display performance of the display panel.

Disclosure of Invention

The invention provides an array substrate and a display panel, which are used for improving the bending resistance of signal routing so as to ensure that the display panel has higher display performance.

In a first aspect, an embodiment of the present invention provides an array substrate, including:

the substrate comprises a display area and a bending area arranged on at least one side of the display area;

the bending area comprises a plurality of signal wires; along the direction perpendicular to the extending direction of the signal wire, a first side of the cross section of the signal wire, which is far away from the substrate, is a curve.

Set up like this for the upper surface of keeping away from the base plate of signal line is the curved surface, because the area of curved surface is bigger for the plane, and the stress that can bear on the signal unit area is the same, behind the area of increase signal line upper surface, has increased the stress that the signal line can bear, thereby has promoted the resistant bending performance of signal line, has guaranteed that display panel has higher display performance.

Optionally, the first edge is a smoothly-transitional curve;

optionally, the first edge is arc-shaped.

Set up like this for the upper surface of signal line is comparatively level and smooth curved surface, avoids the upper surface to appear sharp-pointed arch etc. and easily appears stress concentration's structure, has further promoted the anti bending performance of signal line.

Optionally, along a direction perpendicular to the extending direction of the signal trace, a second edge of the cross section of the signal trace, which is adjacent to the substrate, is a straight line parallel to the surface of the substrate.

Set up like this, guarantee that the signal walks under the unchangeable condition of the area of its extending direction's of perpendicular to cross-section for first edge can have bigger fluctuation change space, is guaranteeing promptly that the signal walks under the unchangeable condition of impedance of line, has guaranteed that the signal walks the upper surface of keeping away from the base plate and can have bigger area, further promotes the resistant bending performance of signal walking the line.

Optionally, in a direction perpendicular to the extending direction of the signal trace, two ends of the cross section of the signal trace, which are adjacent to the second edge of the substrate, intersect with two ends of the first edge, respectively, and an included angle at an intersection of the first edge and the second edge is smaller than 90 degrees.

Set up like this, first limit is connected with the second limit and is formed the whole profile that the signal walked the line, and is unchangeable at the length on second limit, and the line width that the signal was walked the line promptly is unchangeable, and when the cross sectional area of signal was walked the line was unchangeable, first limit can have bigger length, and the area of the upper surface of signal was walked the line promptly can be bigger, has further promoted the resistant bending performance of signal line.

Optionally, an included angle between the first edge and the second edge is 30-45 degrees.

Optionally, along the extending direction of the signal trace, at least one groove is disposed on the surface of the substrate adjacent to the signal trace, and at least a portion of the signal trace is disposed in the groove.

Set up like this, the signal is walked the line and can be formed a difference in height at the recess, is favorable to alleviating the stress that receives when display panel buckles, improves the resistant performance of buckling of signal line to avoid the signal to walk the broken string, improve display panel's resistant performance of buckling.

Optionally, the cross section of the groove along the direction parallel to the extending direction of the signal trace and perpendicular to the substrate is trapezoidal, and the long side of the trapezoid is located at the opening of the groove.

Set up like this for the contained angle between the upper surface of base plate and the lateral wall of recess is greater than ninety degrees, and the contained angle between the lateral wall of recess and the bottom surface is greater than ninety degrees, makes the transition of signal line more gentle, can effectively avoid stress concentration, is favorable to improving the resistant bending performance of signal line.

Optionally, an organic layer is disposed on a surface of the substrate adjacent to the signal trace, and the signal trace is completely embedded in the organic layer. Set up like this, the organic layer can play the cushioning effect to the stress on the signal is walked the line, has further promoted the resistant performance of buckling of signal line.

Optionally, a distance between the signal trace and the lower surface of the organic layer on the side close to the substrate is a first distance, a distance between the signal trace and the upper surface of the organic layer on the side far from the substrate is a second distance, and the second distance is greater than the first distance.

In a second aspect, an embodiment of the present invention further provides a display panel, including the array substrate according to any embodiment of the present invention.

According to the embodiment of the invention, the first side of the section of the signal wiring, which is perpendicular to the extending direction of the signal wiring, in the bending area and is far away from the substrate is set to be the curve, so that the upper surface of the signal wiring, which is far away from the substrate, is the curved surface, and the area of the curved surface is larger than that of a plane, and the stress borne by the signal wiring is the same in unit area, and after the area of the upper surface of the signal wiring is increased, the stress borne by the signal wiring is increased, so that the bending resistance of the signal wiring is improved, and the display panel is ensured to have higher display performance.

Drawings

Fig. 1 is a schematic diagram of a display panel according to an embodiment of the present invention;

fig. 2 is a schematic plan view of an array substrate according to an embodiment of the present invention;

FIG. 3 is a schematic plan view of a bending region provided in accordance with an embodiment of the present invention;

FIG. 4 is a cross-sectional view of the bending region taken along section line AA in FIG. 3;

FIG. 5 is a cross-sectional view of yet another inflection region provided in accordance with an embodiment of the present invention;

FIG. 6 is a cross-sectional view of yet another inflection region provided in accordance with an embodiment of the present invention;

FIG. 7 is a schematic plan view of another inflection region provided in accordance with an embodiment of the present invention;

FIG. 8 is a schematic cross-sectional view of the fold region taken along section line BB in FIG. 7;

fig. 9 is a schematic diagram of a display device according to an embodiment of the invention;

FIG. 10 is a flow chart of a method for fabricating an array according to an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the prior art, in order to realize a narrow frame or no frame of a display panel, a binding region needs to be bent to the back of the display panel. When the bending radius of the bending area is small, stress concentration is easy to occur, and signal wiring is broken, so that signal transmission of the display panel is affected, and display performance is affected. Based on this, the present invention proposes the following solutions:

fig. 1 is a schematic view of a display panel according to an embodiment of the present invention, fig. 2 is a schematic plan view of an array substrate according to an embodiment of the present invention, fig. 3 is a schematic plan view of a bending region according to an embodiment of the present invention, and fig. 4 is a schematic cross-sectional view of the bending region along a section line AA in fig. 3, where the section line AA is perpendicular to an extending direction of signal traces. Referring to fig. 1 to 4, the array substrate includes:

the display device comprises a substrate 10, wherein the substrate 10 comprises a display area 11 and a bending area 12 arranged on at least one side of the display area 11;

the bending region 12 includes a plurality of signal traces 20; along a direction Y perpendicular to the extending direction X of the signal trace 20, a first side 21 of the cross section of the signal trace 20 away from the substrate 10 is a curve.

The bending region 12 is a region where the display panel is bent and deformed, the bending region 12 is bent towards a side away from the display surface of the display panel, and the substrate 10 is located inside the bending region 12. The display area 11 is used for realizing image display, and the display area 11 of the array substrate may include a driving circuit corresponding to the pixel unit. The bending region 12 may include a part of the display region, and in this case, the display region in the bending region 12 and the display region 11 form a display region of the array substrate; the bending regions 12 may also be located in the non-display region, which is not specifically limited in this embodiment. The same display panel may include one bending region 12, or may include a plurality of bending regions 12, and this embodiment is not particularly limited. Accordingly, when the array substrate includes one bending region 12, the bending region 12 may be disposed on any side of the display region 11, for example, on the lower side of the display region 11.

The first side that the base plate 10 was kept away from to the cross-section of signal line 20 perpendicular to its extending direction in this embodiment is the curve through setting up bending zone 12 for the upper surface of keeping away from base plate 10 of signal line 20 is the curved surface, because the area of curved surface is bigger for the plane, and the stress that can bear on the signal unit area is the same, increase the area of signal line 20 upper surface after, increased the stress that signal line 20 can bear, thereby the resistant bending performance of signal line 20 has been promoted, guaranteed that display panel has higher display performance.

For example, referring to fig. 2, when the bending region 12 is located at one side of the display region 11, the bending region 12 may be a region connecting the display region 10 and the binding region 122. The bonding area 122 is provided with an external terminal 40, the external terminal 40 is connected to the driving circuit board, and the signal trace 20 is used for connecting the signal line 111 in the display area 11 and the external terminal 40. The signal line 111 may be a gate line or a data line. When the display panel displays, the driving circuit board sends a display driving signal, the display driving signal is transmitted to the signal line 111 of the display area 11 through the signal routing 20, and the signal line 111 transmits the display driving signal to the driving circuit in the display area 11 of the array substrate, so that the driving circuit drives the pixel unit to emit light.

Optionally, the first side 21 is a smoothly transitioning curve. Set up like this for the upper surface of signal line 20 is comparatively level and smooth curved surface, avoids the upper surface to appear sharp-pointed arch etc. and easily appears stress concentration's structure, has further promoted the anti bending performance of signal line 20.

Alternatively, the first edge 21 is arcuate in shape. Specifically, because the whole lines of arc are more gentle than other curves for the upper surface of signal line 20 is more level and smooth, has further promoted the anti bending performance of signal line 20. Referring to fig. 4, the first side 21 may be a semi-ellipse, a semi-circle or an arc with other curvature, and the embodiment is not particularly limited.

Fig. 5 is a cross-sectional view of another bending region provided in an embodiment of the present invention, fig. 6 is a cross-sectional view of another bending region provided in an embodiment of the present invention, and referring to fig. 5 to 6, the first edge 21 may also have a wave shape, a zigzag shape, or the like.

Alternatively, referring to fig. 4-6, along a direction Y perpendicular to the extending direction X of the signal trace 20, the section of the signal trace 20 adjacent to the second edge 22 of the substrate 10 is a straight line parallel to the surface of the substrate 10.

Specifically, because the base plate 10 is located the inboard of buckling zone 12, when buckling zone 12 buckles, the surface that signal line 20 is close to the base plate is compressive stress, because the ability that the signal bears compressive stress is stronger, consequently through setting up second limit 22 into the straight line, under the unchangeable condition of area of the cross-section of signal line 20 perpendicular to its extending direction X, make first limit 21 can have bigger fluctuation change space, under the unchangeable condition of impedance of signal line 20 is guaranteed promptly, the upper surface of having guaranteed that signal line 20 keeps away from base plate 10 can have bigger area, further promote the resistant bending performance of signal line 20.

Optionally, along a direction Y perpendicular to the extending direction X of the signal trace 20, two ends of the cross section of the signal trace 20, which are adjacent to the second edge 22 of the substrate 10, intersect with two ends of the first edge 21, respectively, and an included angle at an intersection of the first edge 21 and the second edge 22 is smaller than 90 degrees.

With such an arrangement, the first edge 21 and the second edge 22 are connected to form the whole outline of the signal trace 20, the length of the second edge 22 is not changed, that is, the line width of the signal trace 20 is not changed, and when the cross-sectional area of the signal trace 20 is not changed, the first edge 21 may have a larger length, that is, the area of the upper surface of the signal trace 20 may be larger, so as to further improve the bending resistance of the signal trace 20.

Illustratively, referring to fig. 4, when the first side 21 is curved, the maximum included angle between the first side 21 and the second side 22 is located at the intersection of the first side 21 and the second side 22. The first edge 21 and the first end of the second edge 22 form a first included angle α, and the second edge 22 and the second end form a second included angle β, and both the first included angle α and the second included angle β are smaller than 90 degrees.

Optionally, the included angle between the first edge 21 and the second edge 22 is 30-45 degrees. The inventor finds, through simulation experiments, that when an included angle between the first side 21 and the second side 22 is too large, the thickness of the edge of the signal trace 20 is large, and the signal trace is less prone to bending, that is, a larger force is required during bending, so that the stress borne by the signal trace 20 is large, and the signal trace 20 is prone to breaking. In addition, when the included angle between the first side 21 and the second side 22 is too small, the edge of the signal trace 20 is too thin, and cracks are easily generated. When the included angle between the first side 21 and the second side 22 is 30 degrees to 45 degrees, the signal trace 20 has better bending resistance.

Fig. 7 is a schematic plan view of another bending region provided in an embodiment of the invention, and fig. 8 is a schematic cross-sectional view of the bending region along a section line BB in fig. 7, referring to fig. 7 and fig. 8, optionally, along the extending direction X of the signal trace 20, at least one groove 121 is disposed on the surface of the substrate 10 adjacent to the signal trace 20, and the signal trace 20 is at least partially disposed in the groove 121.

Specifically, the signal trace 20 is partially disposed in the groove 121, and the signal trace 20 may form a height difference at the groove 121, which is beneficial to relieving the stress applied when the display panel is bent, and improving the bending resistance of the signal trace 20, thereby avoiding the disconnection of the signal trace 20 and improving the bending resistance of the display panel.

Alternatively, referring to fig. 8, along a direction parallel to the extending direction X of the signal trace 20 and perpendicular to the substrate 10, the cross section of the groove 121 is shaped as a trapezoid, and a long side of the trapezoid is located at the opening of the groove 121.

Specifically, the cross section of the groove 121 is set to be trapezoidal, so that the included angle between the upper surface of the substrate 10 and the side wall of the groove 121 is greater than ninety degrees, and the included angle between the side wall of the groove 121 and the bottom surface is greater than ninety degrees, so that the transition of the signal routing 20 is more gradual, the stress concentration can be effectively avoided, and the bending resistance of the signal routing 20 is favorably improved.

Optionally, referring to fig. 8, one side of the substrate 10 adjacent to the signal trace 20 is provided with an organic layer 13, and the signal trace 20 is completely embedded in the organic layer 30.

Specifically, because organic material has certain cushioning effect, through setting up signal line 20 and embedding completely in organic layer 30, organic layer 13 can play the cushioning effect to the stress on signal line 20, has further promoted the resistant performance of buckling of signal line 20.

Specifically, referring to fig. 8, the organic layer 30 may include a first organic layer 13 and a second organic layer 14, the signal trace 20 is formed on the surface of the first organic layer 13, and the second organic layer 14 covers the signal trace 20. The groove 121 may be formed on the surface of the first organic layer 13 adjacent to the signal trace 20 as shown in fig. 8, and the depth of the groove 121 may be less than or equal to the thickness of the first organic layer 13, or may be greater than the thickness of the first organic layer 13, which is not limited in this embodiment. In addition, referring to fig. 7, one or more grooves 121 may be disposed along the extending direction X of the signal trace 20.

Alternatively, referring to fig. 8, the distance between the signal trace 20 and the lower surface of the organic layer 30 near the substrate 10 is a first distance D1, the distance between the signal trace 20 and the upper surface of the organic layer 30 far from the substrate 10 is a second distance D2, and the second distance D2 is greater than the first distance D1.

Specifically, because the ability that signal line 20 bears the stretch is less than the ability that bears the compression, be greater than first distance D1 through setting up second distance D2, be favorable to adjusting the position of the neutral layer of buckling to reduce the tensile stress that signal line 20 bore, reduce signal line 20 because buckle and cracked risk.

The embodiment also provides a display panel, which comprises the array substrate provided by any embodiment of the invention.

The display panel of the array substrate corresponds to the display area, and the bending area of the array substrate corresponds to the bending area of the display panel.

Fig. 9 is a schematic diagram of a display device according to an embodiment of the present invention, and referring to fig. 9, the display device 100 includes a display panel 200 according to any embodiment of the present invention. The display device 100 may be an electronic display device such as a mobile phone and a tablet computer.

The embodiment also provides a method for manufacturing an array substrate, and fig. 10 is a flowchart of the method for manufacturing an array substrate according to the embodiment of the present invention, and with reference to fig. 10, the method includes:

step 310, a substrate is provided, wherein the substrate includes a display area and a bending area disposed on at least one side of the display area.

Step 320, forming a plurality of signal wires in the bending area; along the direction perpendicular to the extending direction of the signal wire, a first side of the cross section of the signal wire, which is far away from the substrate, is a curve.

This embodiment is through setting up the first side that the base plate was kept away from to the cross-section of its extending direction of signal line perpendicular to in the district of buckling for the upper surface of keeping away from the base plate of signal line is the curved surface, because the area of curved surface is bigger for the plane, and the last stress that can bear of signal unit area is the same, behind the area of increase signal line upper surface, increased the signal and walked the stress that the line can bear, thereby promoted the resistant bending performance of signal line, guaranteed that display panel has higher display performance.

Optionally, step 320 includes:

and forming a plurality of signal wires in the bending area by adopting a half-tone mask.

Specifically, the halftone mask process has different light transmittances by setting different areas of the halftone mask, so that a plurality of films with different thicknesses can be prepared simultaneously, the preparation procedures of the display panel can be reduced, the productivity is improved, and the manufacturing cost of the display panel is reduced. In addition, a common mask can be adopted to form signal routing by adjusting etching parameters.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. An array substrate, comprising:

the bending area comprises a plurality of signal wires; along the direction vertical to the extending direction of the signal wire, a first side of the cross section of the signal wire, which is far away from the substrate, is a curve;

along the direction perpendicular to the extending direction of the signal routing, two ends of the cross section of the signal routing, which are adjacent to the second edge of the substrate, are respectively intersected with two ends of the first edge, and the included angle of the intersection of the first edge and the second edge is smaller than 90 degrees.

2. The array substrate of claim 1, wherein:

the first side is a smoothly transitioning curve.

3. The array substrate of claim 1, wherein:

along the direction perpendicular to the extending direction of the signal routing wire, the section of the signal routing wire, which is adjacent to the second edge of the substrate, is a straight line parallel to the surface of the substrate.

4. The array substrate of claim 1, wherein:

the included angle between the first edge and the second edge is 30-45 degrees.

5. The array substrate of claim 1, wherein:

along the extending direction of the signal routing lines, at least one groove is formed in the surface, adjacent to the signal routing lines, of the substrate, and at least part of the signal routing lines are arranged in the groove.

6. The array substrate of claim 5, wherein:

the cross section of the groove in the direction parallel to the extending direction of the signal wiring and perpendicular to the substrate is trapezoidal, and the long side of the trapezoid is located at the opening of the groove.

7. The array substrate of claim 1, wherein:

the surface of the substrate, which is close to the signal wiring, is provided with an organic layer, and the signal wiring is completely embedded in the organic layer.

8. The array substrate of claim 7, wherein:

the distance between the signal wiring and the lower surface of the organic layer close to one side of the substrate is a first distance, the distance between the signal wiring and the upper surface of the organic layer far away from one side of the substrate is a second distance, and the second distance is larger than the first distance.

9. The array substrate of claim 1, wherein:

the first edge is arc-shaped.

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