TWI741573B - Display panel - Google Patents

Abstract

A display panel comprises a first substrate, a second substrate and a flexible substrate. The first substrate has a first side wall. At least a part of the second substrate is overlapped with the first substrate and the second substrate has a second side wall. The first side wall and the second side wall are arranged side by side. Wherein a first mark having a first corner portion is arranged on the first side wall. At least a part of the first area faced the first side wall . A second mark is arranged on a surface of the flexible substrate faced to the plane. The second mark is similar to the first mark and is smaller than the first mark. The second mark has a second corner portion. Wherein the second corner portion and the first corner portion are at least partially overlapped.

Description

Display panel

The present invention relates to a display panel, in particular to a display panel with alignment marks.

In recent years, consumer tastes and product design trends have increased the demand for narrow-frame display panels. The process of thin or narrow-frame display panels has gradually become the mainstream due to the fact that chip on film (COF) is more convenient to test and easy to rework than other processes. In the current technology, there is a design in which the bonding position of the COF and the display panel is moved to the edge of the side of the substrate, so that the display frame can be further narrowed.

However, the COF is prone to poor alignment during installation, resulting in poor contact of the connection pads. Especially when the image quality is improved, such as an 8k display panel, the line distance between the connection pads will be less than 70 μm, and the difficulty of alignment will increase accordingly. In addition, the increase in alignment difficulty will also lead to an increase in man-hours, which in turn increases manufacturing costs. Therefore, how to improve the convenience and readability of the connection pad alignment when attaching the driver chip will be a major key.

An object of the present invention is to provide a display panel with alignment marks.

One purpose of the present invention is to improve the convenience and readability of the alignment of the connection pad.

The invention provides a display panel including a first substrate, a second substrate and a flexible substrate. The first substrate has a first side wall. The second substrate is at least partially overlapped with the first substrate and has a second side wall. The first side wall and the second side wall are side by side. The first side wall is provided with a first mark having a first corner portion. The flexible substrate is at least partially overlapped with the first side wall. A second mark is provided on the first area of the flexible substrate opposite to the first side wall. The second mark is similar in shape to the first mark and has an area smaller than that of the first mark. The second mark has a second corner. Wherein, the second corner portion and the first corner portion at least partially overlap.

The invention provides a display panel including a first substrate, a second substrate and a flexible substrate. The first substrate has a first side wall. The second substrate is at least partially overlapped with the first substrate and has a second side wall. The first side wall and the second side wall are arranged side by side, wherein the first side wall is provided with a first mark. The first mark has a first side and a second side. The first side and the second side together form a first corner. The flexible substrate is at least partially overlapped with the first side wall. The first area of the flexible substrate opposite to the first side wall is provided with a second mark having an area smaller than the first mark. The second mark has a first side and a second side, and the first side and the second side together form a second corner. Wherein, the first side is substantially aligned with the first side, and the second side is substantially aligned with the second side.

The display panel as described above is aligned with the marks on the side wall of the substrate and the marks on the flexible substrate. And through the alignment or overlap of the corners of the marks, the convenience of interpretation in the alignment is improved. This achieves the purpose of improving the convenience and readability of the connection pad alignment.

The following will clearly illustrate the spirit of the present disclosure with diagrams and detailed descriptions. Anyone with ordinary knowledge in the technical field who understands the embodiments of the present disclosure can change and modify the techniques taught in the present disclosure. It does not depart from the spirit and scope of this disclosure.

Regarding the "first", "second", etc. used in this text, they do not specifically refer to order or sequence, nor are they used to limit the present invention. They are only used to distinguish elements or operations described in the same technical terms.

Regarding the "include", "include", "have", "contain", etc. used in this article, they are all open terms, which means including but not limited to.

Regarding the terms used in this article, unless otherwise specified, each term usually has the usual meaning of each term used in this field, in the content disclosed here, and in the special content. Some terms used to describe the present disclosure will be discussed below or elsewhere in this specification to provide those skilled in the art with additional guidance on the description of the present disclosure.

Please refer to FIG. 1, which illustrates a display panel 10 including a first substrate 110, a second substrate 120 and a flexible substrate 130. Specifically, the first substrate 110 and the second substrate 120 are, for example, glass substrates, and the gap G between the first substrate 110 and the second substrate 120 may be provided with a liquid crystal material, but the present invention is not limited thereto. The first substrate 110 has a first side wall 111. At least a part of the second substrate 120 is overlapped with the first substrate 110. For example, the second substrate 120 is disposed below the first substrate 110 and has a second side wall 121 that is parallel to the first side wall 111. Specifically, the first side wall 111 and the second side wall 121 are both located on the plane A. A substrate connection pad 140 may be provided on the plane A, and the substrate connection pad 140 may be electrically connected to the transistor array (not shown in FIG. 1) in the first substrate 110 and the second substrate 120, for example. It should be noted that the present invention is not limited to the number and arrangement of the substrate connection pads 140. One of the first side wall 111 and the second side wall 121 is provided with a first mark M1 having a first corner C1. It should be noted that FIG. 1 is only for example, and the first mark M1 is provided on the first side wall 111, however, the first mark M1 may also be provided on the second side wall 121. In addition, the present invention is not limited to the number of the first marks M1. In this embodiment, there may be two first marks M1 and they are provided on both sides of the substrate connection pad 140, respectively. The angle of the first corner C1 is preferably 90 degrees. It should be noted that FIG. 1 is only a simple example of drawing the first mark M1 as a rectangle, however, the shape of the first mark M1 of the present invention is not limited to this. In addition, FIG. 1 only depicts the part where the first substrate 110, the second substrate 120 and the flexible substrate 130 are combined, and for the sake of clarity of the drawing, the actual ratio is not limited to FIG. 1.

The flexible substrate 130 is disposed on the plane A. For example, at least a part of the flexible substrate 130 is stacked on the first side wall 111. The first area 131 of the flexible substrate 130 opposite to the first side wall 111 is provided with a second mark M2 similar to the first mark M1 and smaller in area than the first mark M1. Specifically, the flexible substrate 130 is preferably a transparent or semi-transparent material. For example, but not limited to, a driver IC or other electronic components are provided on the flexible substrate 130. The first region 131 of the flexible substrate 130 opposite to the first side wall 111 may be provided with a driving connection pad 150 corresponding to the substrate connection pad 140. The second mark M2 is a similar shape to the first mark M1 and has an area smaller than that of the first mark M1. In other words, the first mark M1 will be equal to the second mark M2 after being reduced by a certain ratio. Preferably, the area of the first mark M1 is at least 4 times larger than the area of the second mark M2. For example, if the second mark M2 is a square with a side length of 150 μm, the first mark M1 is also a square with a side length of 300 μm or more. The second mark M2 has a second corner C2. Wherein, the second corner portion C2 and the first corner portion C1 at least partially overlap. Specifically, as shown in FIG. 2A, the position of the second corner C2 on the second mark M2 can correspond to the position of the first corner C1 on the first mark M1. When the flexible substrate 130 is placed on the plane A, the second corner portion C2 is cut and overlapped to the first corner portion C1 as much as possible in operation. The driving connection pad 150 can be aligned and overlapped with the substrate connection pad 140 without causing a short circuit or open circuit. It should be noted that, for the sake of a simple example, FIG. 2A does not draw details of other display panels.

In addition, the second corner portion C2 is aligned and overlapped to the first corner portion C1, which can be viewed from two aspects. On the one hand, the apex of the second corner C2 is aligned with the apex of the first corner C1. On the other hand. The first mark M1 has a first side m11 and a second side m12. The first side m11 and the second side m12 together form a first corner C1. The second mark M2 has a first side m21 and a second side m22, and the first side m21 and the second side m22 together form a second corner C2. The first side m11 is substantially aligned with the first side m21, and the second side m12 is substantially aligned with the second side m22. Substantial alignment is defined as being aligned or within a reasonable offset range as described below.

However, when the flexible substrate 130 is placed on the plane A, the second corner C2 may not completely overlap to the first corner C1 and only partially overlap the first corner C1 due to assembly tolerances and other reasons. . For example, FIG. 2B is a schematic diagram of the flexible substrate 130 shifted from the first position L1 to the second position L2 after being installed. The direction in which the flexible substrate 130 is shifted may be a horizontal direction H and a vertical direction V. The flexible substrate 130 may also be offset by an angle θ. As shown in FIG. 2C, the flexible substrate 130 is offset from the first position L1 to the third position L3, and the first position L1 and the third position L3 sandwich the angle θ. Preferably, the range of the reasonable deviation range is limited to the fact that the substrate connection pads 140 are not short-circuited with each other or the substrate connection pad 140 and the opposite driving connection pad 150 are not disconnected from each other. In addition, the present invention is not limited to the position of the first corner C1 in the first mark M1. For example, if the first mark M1 is a rectangle, all four corners of the first mark M1 can be defined as corners for alignment. Yube.

In one embodiment, referring to FIG. 3A, the first mark V1 is disposed adjacent to the first side m11 and has a first extension portion, the first extension portion extending along a direction transverse to the first side (vertical direction V). When the flexible substrate 130 is placed on the plane A, the third side of the second mark is connected to the first side and opposite to the second side, wherein the third side is opposite to the first extension part, and Extend substantially parallel. When the flexible substrate is set, fine adjustment can be made according to the distance between the third side of the second mark M2 and the first mark V1, so that the second corner C2 is as neat as possible and overlaps the first corner C1 and/or The first side m11 is substantially aligned with the first side m21, and the second side m12 is substantially aligned with the second side m22. It should be noted that the first mark M1 may include multiple marks, which are then combined into a ruler shape. In addition, as shown in FIG. 3B, the first mark M1 may have a vertical mark Vv extending in the vertical direction V and a horizontal mark Vh extending in the horizontal direction H. When the flexible substrate 130 is placed on the plane A, it can be The distance between the third side m23 of the second mark M2 and the vertical mark Vv and the distance between the fourth side m24 and the horizontal mark Vh are fine-tuned.

In one embodiment, the first mark has a first diagonal portion that is diagonal to the first corner portion, and the first diagonal portion and the area where the first mark is distributed at least partially overlap. For example, the vertical mark Vv and the horizontal mark Vh shown in FIG. 3C may be combined into an arrow shape, or the vertical mark Vv and the horizontal mark Vh shown in FIG. 3D may be combined into a net shape. However, the above example is only for simplifying the description, and the present invention is not limited to this. In general, the type that can be reorganized by the knowledgeable person according to the above content should belong to the scope of the present invention.

In one embodiment, the average roughness (Ra) of the center line of the first mark M1 ranges from 0.2 μm to 5 μm and/or the average roughness (Rz) ranges from 1 to 50 μm. For example, the surface roughness of the first mark M1 is relatively large, which can avoid or reduce the offset caused by assembly after the second corner portion C2 is cut and overlapped to the first corner portion C1. However, the present invention provides The purpose of the difference in surface roughness is not limited to this.

4, the first substrate 110 or the second substrate 120 may also be provided with a third mark M3, and the flexible substrate 130 may be provided with a corresponding fourth mark M4. Specifically, the third mark M3 is provided on the first side wall 111 and the second side wall 121 where the first mark M1 is not provided. For example, when the first mark M1 is disposed on the first side wall 111, the third mark M3 is disposed on the second side wall 121. Conversely, when the first mark M1 is disposed on the second side wall 121, the third mark M3 is disposed on the first side wall 111. The third mark M3 is preferably arranged within the vertical projection range Pv1 of the first mark M1 and is at least 5 μm away from the first mark M1 d1. The fourth mark M4 is disposed on the first area 131 of the flexible substrate 130 opposite to the plane A. The fourth mark M4 is the same as the third mark M3. The third mark M3 and the fourth mark M4 are preferably but not limited to rectangles extending in the horizontal direction H. After the flexible substrate 130 is placed on the plane A, the third mark M3 and the fourth mark M4 are close to each other but do not overlap each other. The definition of being close to each other but not overlapping each other is defined as being close to each other at most until the sides are aligned. Preferably, the vertical projection range Pv2 of the third mark M3 and the fourth mark M4 overlap each other, and the distance d2 between the third mark M3 and the fourth mark M4 is between 0.5 μm and 100 μm, and the preferred distance d2 is between 0.5 μm and Between 50μm. In this embodiment, when the first mark M1 and the second mark M2 overlap so that the recognition is poor, the third mark M3 and the fourth mark M4 can provide an auxiliary alignment function. Through the skew or misalignment relationship between the third mark M3 and the fourth mark M4, it can be judged whether the flexible substrate 130 is shifted in the vertical direction V or the horizontal direction H and the angle θ is shifted during installation. However, the reason and purpose of providing the third mark M3 and the fourth mark M4 are not limited to this.

In one embodiment, the third mark M3 may also have a vertical mark Vv extending in the vertical direction V and/or a horizontal mark Vh extending in the horizontal direction H to improve the readability of the alignment between the horizontal direction H and the vertical direction V . For example, when the flexible substrate 130 is arranged on the plane A, the alignment can be assisted by the distance between the side m41 of the fourth mark M4 and the vertical mark Vv and/or the side m42 of the fourth mark M4 and the horizontal mark Vh. Improve readability. However, the alignment method is not limited to this.

In one embodiment, referring to FIG. 5, the first substrate 110 or the second substrate 120 may also be provided with a fifth mark M5, and the flexible substrate 130 may be provided with a corresponding sixth mark M6. The fifth mark M5 is provided on the first side wall 111 and the second side wall 121 where the first mark M1 is provided. For example, when the first mark M1 is disposed on the first side wall 111, the fifth mark M5 is disposed on the first side wall 111. Conversely, when the first mark M1 is disposed on the second side wall 121, the fifth mark M5 is disposed on the second side wall 121. The fifth mark M5 is preferably arranged within the horizontal projection range Ph1 of the first mark M1 and is at least 5 μm away from the first mark M1. The sixth mark M6 is disposed on the first area 131 of the flexible substrate 130 opposite to the plane A. The fifth mark M5 is the same as the sixth mark M6. The fifth mark M5 and the sixth mark M6 are preferably but not limited to rectangles extending in the vertical direction V. After the flexible substrate 130 is disposed on the plane A, the fifth mark M5 and the sixth mark M6 at least partially overlap. In this embodiment, the third mark M3 and the fourth mark M4 are close to each other but do not overlap each other, and the fifth mark M5 and the sixth mark M6 are at least partially overlapped. Therefore, for example, but not limited to, the purpose of complementing and increasing readability can be achieved. In addition, the fifth mark M5 is preferably provided with a vertical mark Vv extending in the vertical direction V and/or a horizontal mark Vh extending in the horizontal direction H, passing through the distance between the side m61 of the sixth mark M6 and the vertical mark Vv and/or the sixth mark M6. The distance between the side m62 of the mark M6 and the horizontal mark Vh is used to fine-tune the mounting of the flexible substrate.

In one embodiment, the installation of the flexible substrate 130 can assist in interpreting the marks M1, M3, M5 on the first substrate 110 and the second substrate 120 and correspondingly disposed on the flexible substrate through an image capturing system, such as a physical microscope or a photosensitive coupling element. The spacing or offset angle of marks M2, M4, M6 on 130.

It should be noted that the first mark M1 of the present invention is not limited to a rectangle, such as a cross shape shown in FIG. 6A or a T shape shown in FIG. 6B. It should be noted that the present invention is not limited to the position of the corner portion for alignment, so any corner portion can be selected for the cross shape or T shape for alignment. However, any graphics with obvious corners should belong to the scope of the present invention.

The present invention has been described in the above-mentioned related embodiments, but the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, modifications and equivalent arrangements included in the spirit and scope of the patent application are all included in the scope of the present invention.

10: Display panel 110, 120: substrate 111, 121: sidewall 130: Flexible substrate 140: substrate connection pad 150: drive connection pad M1, M2: mark C1, C2: corner G: gap A: plane V, H: direction L1, L2, L3: position m21, m22, m41, m42, m61, m62: side V1, Vv, Vh: mark Ph, Pv: projection range

FIG. 1 is a partial schematic diagram of a display panel in an embodiment of the present invention.

Fig. 2A is a schematic diagram showing the alignment of the corners of the flexible substrate when the flexible substrate is installed in an embodiment of the present invention.

2B and 2C are schematic diagrams of shifting after the flexible substrate is installed in an embodiment of the present invention.

3A to 3D are schematic diagrams of setting marks for the first mark in an embodiment of the present invention.

Fig. 4 is a schematic diagram of setting a third mark and a fourth mark in an embodiment of the present invention.

FIG. 5 is a schematic diagram of setting the fifth mark and the sixth mark in an embodiment of the present invention.

Fig. 6 is a schematic diagram of another embodiment of the symbol pattern of the present invention.

10: Display panel

110, 120: substrate

111, 121: sidewall

130: Flexible substrate

140: substrate connection pad

150: drive connection pad

M1, M2: mark

C1, C2: corner

G: gap

A: plane

Claims (16)

A display panel includes: a first substrate having a first side wall; a second substrate arranged to at least partially overlap the first substrate and having a second side wall, the first side wall and the second side wall being side by side, The first side wall is provided with a first mark having a first corner portion; and a flexible substrate is provided at least partially overlapped with the first side wall, and the flexible substrate is located on a first area opposite to the first side wall A second mark is provided; the second mark is similar in shape to the first mark and has an area smaller than the first mark; wherein, the second mark has a second corner portion, and the second corner portion is connected to the first The corners overlap at least partially; wherein, a first mark is formed on the first mark, and at least one side of the second mark is close to the first mark. The display panel according to claim 1, wherein the angle of the first corner portion is 90 degrees. The display panel of claim 1, wherein the first mark has a first side and a second side, and the first side and the second side together form the first corner; the first mark is It is arranged adjacent to the first side and has a first extension portion, and the first extension portion extends along a direction transverse to the first side. The display panel according to claim 3, wherein the second mark has a first side and a second side respectively corresponding to the first side and the second side, the first side and the second side The side edges together sandwich the second corner portion; the second mark also has a third side edge connected to the first side edge and opposite to the second side edge, wherein the third side edge is connected to the first side edge. An extension part is opposite and extends substantially in parallel. The display panel according to claim 1, wherein the first mark has a first diagonal portion and the first corner portion is diagonal, and the first diagonal portion and the area where the first mark is distributed at least partially overlap . The display panel according to claim 1, wherein the area of the first mark is greater than or equal to 4 times the area of the second mark. The display panel according to claim 1, wherein the center line average roughness (Ra) of the first mark M1 ranges from 0.2 μm to 5 μm or the average roughness (Rz) ranges from 1 to 50 μm. The display panel of claim 1, wherein a third mark is provided on the second side wall, and a fourth mark is provided on a second area of the flexible substrate opposite to the second side wall; the fourth mark and the first The three signs are similar shapes; among them, the third sign and the fourth sign are close to each other but do not overlap each other. The display panel according to claim 1, wherein a fifth mark is arranged on the first side wall, and a sixth mark is arranged on the first area of the flexible substrate; the sixth mark and the fifth mark are similar in shape; Wherein, the fifth mark and the sixth mark at least partially overlap. A display panel includes: a first substrate having a first side wall; a second substrate arranged to at least partially overlap the first substrate and having a second side wall, the first side wall and the second side wall being side by side, Wherein the first side wall is provided with a first mark, the first mark has a first side and a second side, the first side and the second side are jointly sandwiched to form a first corner; and a flexible substrate, A second mark having an area smaller than the first mark is arranged on a first area of the flexible substrate opposite to the first side wall; the second mark has a first side And a second side edge. The first side edge and the second side edge together form a second corner portion; wherein, the first edge is substantially aligned with the first side edge, and the second edge is substantially aligned with the second side edge. The sides are substantially aligned. The display panel according to claim 10, wherein the angle of the first corner portion is 90 degrees. The display panel according to claim 10, wherein a first mark is formed on the first mark, and at least one side of the second mark is close to the first mark. The display panel according to claim 10, wherein the area of the first mark is greater than or equal to 4 times the area of the second mark. The display panel according to claim 10, wherein the center line average roughness (Ra) of the first mark M1 ranges from 0.2 μm to 5 μm or the average roughness (Rz) ranges from 1 to 50 μm. The display panel of claim 10, wherein a third mark is provided on the second side wall, and a fourth mark is provided on a second area of the flexible substrate opposite to the second side wall; the fourth mark and the first The three signs are similar shapes; among them, the third sign and the fourth sign are close to each other but do not overlap each other. The display panel according to claim 10, wherein a fifth mark is arranged on the first side wall, and a sixth mark is arranged on the first area of the flexible substrate; the sixth mark and the fifth mark are similar in shape; Wherein, the fifth mark and the sixth mark at least partially overlap.

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