Display device and tiled display

Abstract

A display device and a tiled display are disclosed. The display device includes a display panel and a test structure. The display panel has a first surface and a second surface opposite to each other, a side surface disposed between the first surface and the second surface, and a display area disposed on the first surface. The test structure includes a first contact pad, a first test pad, a second contact pad, a second test pad, and a first bridge line. The first contact pad, the first test pad, the second contact pad, and the second test pad are disposed on the second surface. The first bridge line is disposed on the display panel, covers and electrically connects the first contact pad and the second contact pad. The first bridge line is distributed on the second surface and the side surface, and the first bridge line is not distributed on the first surface.

Description

Technical Field

[0001] This invention relates to a display device and a video wall display. Background Technology

[0002] In the field of display device technology, narrow-bezel or bezel-less display devices can provide a large display area and can be applied to splicing products. The peripheral area of ​​the display device has a general driving structure and a test structure for monitoring resistance values. However, if the test structure is too close to the electronic components in the display area, electrostatic discharge (ESD) may occur, causing damage to the electronic components. Summary of the Invention

[0003] To address the aforementioned problems and overcome the shortcomings of existing technologies, this invention provides a display device and a splicing display, which can prevent damage to electronic components in the display area caused by ESD.

[0004] The display device provided by at least one embodiment of the present invention includes a display panel and a test structure. The display panel has a first surface and a second surface opposite to each other, a side surface disposed between the first surface and the second surface, and a display area disposed on the first surface. The test structure includes a first contact pad, a first test pad, a second contact pad, a second test pad, and a first bridging line. The first contact pad is disposed on the second surface. The first test pad is disposed on the second surface and electrically connected to the first contact pad. The second contact pad is disposed on the second surface. The second test pad is disposed on the second surface and electrically connected to the second contact pad. The first bridging line is disposed on the display panel and electrically connects the first contact pad and the second contact pad, wherein the first bridging line covers the first contact pad and the second contact pad, the first bridging line is distributed on the second surface and the side surface, and the first bridging line is not distributed on the first surface.

[0005] In at least one embodiment of the present invention, the side surface of the display panel includes a first inclined surface, a plane and a second inclined surface, the plane is disposed between the first inclined surface and the second inclined surface, the first inclined surface is disposed between the first surface and the plane, and the second inclined surface is disposed between the second surface and the plane.

[0006] In at least one embodiment of the present invention, the first bridging line extends from the second surface to the second slope.

[0007] In at least one embodiment of the present invention, the first bridging line extends from the second surface through the second inclined plane to the plane.

[0008] In at least one embodiment of the present invention, the first bridging line extends from the second surface through the second inclined plane and the plane to the first inclined plane.

[0009] In at least one embodiment of the present invention, the display device further includes a plurality of test structures, wherein a plurality of first test pads and a plurality of second test pads of the plurality of test structures are disposed on a second surface and adjacent to a second inclined surface.

[0010] In at least one embodiment of the present invention, the side edge of the first contact pad is flush with the side edge of the first test pad, and the side edge of the second contact pad is flush with the side edge of the second test pad.

[0011] In at least one embodiment of the present invention, the display device further includes an insulating layer, wherein the insulating layer covers the peripheral area, side surface, first contact pad, first test pad, second contact pad, and second test pad disposed on the first surface.

[0012] In at least one embodiment of the present invention, the display device further includes a third contact pad, a fourth contact pad, and a second bridging line. The third contact pad is disposed in a peripheral region located on a first surface, wherein the third contact pad is electrically connected to a pixel array. The fourth contact pad is disposed on a second surface. The second bridging line electrically connects the third contact pad and the fourth contact pad, wherein the second bridging line extends from the first surface, through a side surface, and to the second surface.

[0013] The splicing display provided by at least one embodiment of the present invention includes a plurality of the aforementioned display panels, wherein the plurality of display devices are arranged in a regular manner and connected to each other.

[0014] Based on the above, since the bridging lines of the test structure are far away from the electronic components in the display area, damage to the electronic components in the adjacent area caused by ESD can be avoided.

[0015] The above description will be given in detail below with reference to the embodiments, and a further explanation of the technical solution of the present invention will be provided. Attached Figure Description

[0016] The various aspects of the invention can be best understood from the following detailed description when read in conjunction with the accompanying drawings. It should be understood that, in accordance with standard industry practice, the various features are not drawn to scale. In fact, for clarity, the dimensions of the various features can be arbitrarily increased or decreased.

[0017] Figure 1A A three-dimensional perspective view of a display device shown in one embodiment of the present invention;

[0018] Figure 1B for Figure 1A An unfolded diagram of the display device;

[0019] Figure 2 for Figure 1B An unfolded view of the display device in another embodiment;

[0020] Figure 3A A three-dimensional perspective view of a display device shown in one embodiment of the present invention;

[0021] Figure 3B for Figure 3A An unfolded diagram of the display device;

[0022] Figure 4A A three-dimensional perspective view of a display device shown in one embodiment of the present invention;

[0023] Figure 4B for Figure 4A An unfolded diagram of the display device;

[0024] Figure 5A A three-dimensional perspective view of a display device shown in one embodiment of the present invention;

[0025] Figure 5B for Figure 5A An unfolded diagram of the display device;

[0026] Figure 6 An unfolded view of a display device illustrating a portion of an embodiment of the present invention;

[0027] Figure 7 An unfolded view of a display device illustrating a portion of an embodiment of the present invention;

[0028] Figure 8 This is a three-dimensional perspective view of a display device shown in one embodiment of the present invention.

[0029] Symbol Explanation

[0030] 100, 100A: Display device

[0031] 110: Display panel

[0032] 112: First Surface

[0033] 114: Side surface

[0034] 116: Second Surface

[0035] 120, 120a, 120b, 120c, 120d, 120e: Test structures

[0036] 122: First contact pad

[0037] 122s: Side

[0038] 124: First Test Pad

[0039] 124s: Side

[0040] 126: Second contact pad

[0041] 126s: Side

[0042] 128: Second test pad

[0043] 128s: Side

[0044] 130: Drive Structure

[0045] 131: Functional Components

[0046] 132: Third contact pad

[0047] 132s: Side

[0048] 134: Third test pad

[0049] 134s: Side

[0050] 135: Connecting pad

[0051] 136: Fourth contact pad

[0052] 136s: Side

[0053] 138: Fourth Test Pad

[0054] 138s: Side

[0055] 139: Flexible Circuit Board

[0056] 210, 210a: Insulation layer

[0057] 300, 400, 500, 600, 700, 800: Display devices

[0058] B1, B3, B4, B5, B6: First bridging lines

[0059] B2: Second bridging line

[0060] R1: Display area

[0061] R2: Surrounding Area

[0062] S1: First inclined plane

[0063] S2: Second inclined plane

[0064] PS: Flat

[0065] U: Repeating structure

[0066] X, Y, Z: Direction Detailed Implementation

[0067] The following discloses many different implementations or embodiments for achieving various features of the invention. Specific embodiments of components and arrangements are described below to simplify the invention. These are, of course, merely embodiments and are not intended to be limiting. For example, in the following description, the formation of a first feature above or on a second feature may include embodiments where the first and second features are formed in direct contact, or embodiments where another feature may be formed between the first and second features so that the first and second features are not in direct contact. Furthermore, reference numerals or words may be repeated in different instances of the invention. The purpose of repetition is to simplify and clarify the description, not to define the relationships between the different implementations and configurations discussed.

[0068] In addition, spatial relative terms such as "below," "below," "lower than," "above," "above," and other similar terms are used here for the convenience of describing the relationship between one element or feature and another element or feature in the figure. Spatial relative terms cover not only the orientation depicted in the figure but also other orientations of the device during use or operation. That is, when the orientation of the device differs from that in the figure (rotated 90 degrees or in other orientations), the spatial relative terms used in this disclosure can also be interpreted accordingly.

[0069] It will be understood that although terms such as "first," "second," etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, without departing from the scope of the embodiments, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0070] The following describes several embodiments of the present invention with reference to the accompanying drawings. For clarity, many practical details will be described in the following description. However, it should be understood that these practical details are not intended to limit the invention. That is, in some embodiments of the invention, these practical details are not essential. Furthermore, for the sake of simplicity, some conventional structures and elements will be shown in the drawings in a simple schematic manner.

[0071] The accompanying drawings in this case indicate the directions X, Y, and Z to show the configuration relationship of the components in the drawing. Directions X, Y, and Z intersect each other, but are not required to be orthogonal to each other. Figure 1A This is a three-dimensional perspective view of a display device 100 according to an embodiment of the present invention. Please refer to... Figure 1AThe display device 100 includes a display panel 110. The display panel 110 has a first surface 112 and a second surface 116 opposite to each other, and a side surface 114 disposed between the first surface 112 and the second surface 116. The side surface 114 of the display panel 110 includes a first inclined surface S1, a plane PS, and a second inclined surface S2. The plane PS is disposed between the first inclined surface S1 and the second inclined surface S2. The first inclined surface S1 is disposed between the first surface 112 and the plane PS, and the second inclined surface S2 is disposed between the second surface 116 and the plane PS.

[0072] exist Figure 1A In the illustrated embodiment, the first inclined surface S1, the plane PS, and the second inclined surface S2 can all be planes, and their normal directions are different from the normal direction of the first surface 112 and the normal direction of the second surface 116. For example, the first surface 112 is parallel to the plane in the X-Y direction, but the plane PS is parallel to the plane in the Y-Z direction. The first inclined surface S1 and the second inclined surface S2 are not parallel to the plane in the X-Y direction or the plane in the Y-Z direction.

[0073] The normal directions of the first surface 112 and the second surface 116 may be parallel to each other, but are not limited thereto. For example, the first surface 112 and the second surface 116 may be parallel to a plane in the X-Y direction, respectively. Furthermore, in other embodiments, the first inclined surface S1 and / or the second inclined surface S2 may be curved surfaces, or curved surfaces or inclined surfaces composed of multiple planes.

[0074] The display device 100 also includes a test structure 120 and a driving structure 130. It should be understood that the display panel 110 is a plate-like object capable of supporting components (such as the test structure 120 and the driving structure 130). The display panel 110 may include a glass substrate or a printed circuit board. The test structure 120 and the driving structure 130 are disposed on the surface of the display panel 110. Figure 1A As shown, both the test structure 120 and the drive structure 130 are three-dimensional circuit structures.

[0075] Display area R1 is disposed on the first surface 112. Display area R1 may contain a pixel array (not shown), wherein the pixel array includes thin-film transistor elements and multiple signal lines (not shown), such as data lines and scan lines. Peripheral area R2 is disposed on the first surface 112. Peripheral area R2 is closer to the first inclined surface S1 of side surface 114 than display area R1, and a portion of driving structure 130 is disposed within peripheral area R2.

[0076] The drive structure 130 is disposed on the first surface 112, the side surface 114 (including the first inclined surface S1, the plane PS and / or the second inclined surface S2) and the second surface 116, such as Figure 1AAs shown. The first surface 112 also includes a functional element 131 configured to drive the display area R1, so that the display device 100 provides display functionality. The functional element 131 may be, for example, a gate driver on array (GOA) or a multiplexer (MUX), but is not limited thereto. Figure 1B Detailed description Figure 1A The configuration and connection relationship of each component.

[0077] Figure 1B for Figure 1A An unfolded view of the display device 100. Please refer to... Figure 1A and Figure 1B , Figure 1B Will Figure 1A The first surface 112, side surface 114, and second surface 116 are shown as continuous planes, illustrating the arrangement and connection relationships of various components. Specifically, Figure 1B The display device 100 shown is a Figure 1A The display device 100 is unfolded, and the first surface 112, the side surface 114, and the second surface 116 are all flattened, so that... Figure 1B The first surface 112, side surface 114, and second surface 116 shown are coplanar, wherein Figure 1B The flattened side surface 114 is also shown, so the first inclined plane S1, plane PS and the second inclined plane S2 are also coplanar.

[0078] Test structure 120 includes a first contact pad 122, a first test pad 124, a second contact pad 126, a second test pad 128, and a first bridging line B1. The first contact pad 122, the first test pad 124, the second contact pad 126, and the second test pad 128 are all disposed on a second surface 116 and adjacent to a second slope S2 of a side surface 114. The first test pad 124 and the second test pad 128 are adapted to receive test signals transmitted via probes. The first test pad 124 is electrically connected to the first contact pad 122, and the second test pad 128 is electrically connected to the second contact pad 126. The first bridging line B1 is electrically connected to and covers the first contact pad 122 and the second contact pad 126. The first bridging line B1 is distributed on the second surface 116 and the side surface 114, but is not distributed on the first surface 112.

[0079] Figure 1A and Figure 1B In the implementation described, the first bridging line B1 extends from the second surface 116, passes through the second inclined surface S2 of the side surface 114, and reaches the plane PS of the side surface 114. In other words, the first bridging line B1 does not extend to the first inclined surface S1 of the side surface 114. Figure 1BAs shown, the first bridging line B1 has a U-shaped circuit pattern. Additionally, in some embodiments, the first inclined plane S1 and the second inclined plane S2 can be planar, such as... Figure 1A As shown.

[0080] Still referencing Figure 1B The drive structure 130 includes a third contact pad 132, a fourth contact pad 136, and a second bridging line B2. The third contact pad 132 is disposed in the peripheral region R2 of the first surface 112. The third contact pad 132 is electrically connected to the pixel array in the display area R1. The fourth contact pad 136 is disposed on the second surface 116. The second bridging line B2 is electrically connected to and covers the third contact pad 132 and the fourth contact pad 136, wherein the second bridging line B2 extends from the first surface 112 through the side surface 114 and to the second surface 116.

[0081] The first bridging line B1 and the second bridging line B2 can be patterned by sputtering a metal material (e.g., copper) onto the surface of the display panel 110, then covering the metal with a mask layer (e.g., photoresist), followed by etching, but this method is not limited to this. The display device 100 also includes a third test pad 134, a fourth test pad 138, and a contact pad 135. The third test pad 134 is adjacent to and electrically connected to the third contact pad 132, and the fourth test pad 138 is adjacent to and electrically connected to the fourth contact pad 136. The third test pad 134 and the fourth test pad 138 are adapted to receive test signals transmitted via probes.

[0082] In some implementations, pad 135 can be used to electrically connect flexible printed circuit board 139 (FPC, see reference). Figure 2 In some embodiments, the sides 122s of the first contact pad 122, the sides 126s of the second contact pad 126, the sides 136s of the fourth contact pad 136, and the sides 138s of the fourth test pad 138 may be flush with each other, such as... Figure 1B As shown. In some embodiments, the side 132s of the third contact pad 132 is flush with the side 134s of the third test pad 134, as shown. Figure 1B As shown.

[0083] In some embodiments, the first contact pad 122, the second contact pad 126, the third contact pad 132, and the fourth contact pad 136 are all the same size, and the first test pad 124, the second test pad 128, the third test pad 134, and the fourth test pad 138 are all the same size. In some embodiments, the sizes of the first contact pad 122, the second contact pad 126, the third contact pad 132, and the fourth contact pad 136 are all smaller than the sizes of the first test pad 124, the second test pad 128, the third test pad 134, and the fourth test pad 138, such as... Figure 1B As shown.

[0084] The first test pad 124 and the second test pad 128 are configured to measure the resistance value of the first bridging line B1. The third test pad 134 and the fourth test pad 138 are configured to measure the resistance value of the second bridging line B2. When contaminants, such as particles or oil, come into contact with the surfaces of the first contact pad 122, the second contact pad 126, the third contact pad 132, and / or the fourth contact pad 136, the resistance value will change. When the contact pads have a small size (e.g., area), the resistance value of the contact pad in contact with the contaminant will show a more significant or drastic change, thereby improving the resistance resolution and enhancing the monitoring function.

[0085] Figure 2 for Figure 1B The display device 100 is shown in an unfolded view in another embodiment. Figure 2 In the implementation method, in Figure 1B An insulating layer 210 covers the display device 100. The insulating layer 210 directly covers the bridging lines (including the first bridging line B1 and the second bridging line B2), and the bridging lines directly cover the contact pads.

[0086] The insulating layer 210 also serves as a protective layer, reducing the risk of ESD damage to surrounding components during subsequent manufacturing processes. The insulating layer 210 also reduces or avoids the risk of short circuits between the first bridging line B1, the second bridging line B2, the first test pad 124, the second test pad 128, the third test pad 134, and the fourth test pad 138. The insulating layer 210 covers the peripheral area R2, side surface 114, first contact pad 122, first test pad 124, second contact pad 126, and second test pad 128 disposed on the first surface 112. Specifically, the insulating layer 210 also covers the first bridging line B1, the third contact pad 132, the third test pad 134, the fourth contact pad 136, the fourth test pad 138, and the second bridging line B2. Furthermore, the insulating layer 210 covers the peripheral area R2 but does not cover the functional element 131 electrically connected to the display area R1. In some embodiments, the flexible circuit board 139 covers and electrically connects to the contact pad 135.

[0087] Figure 3A A three-dimensional perspective view of a display device 300 as shown in an embodiment of the present invention. Figure 3B for Figure 3A An unfolded view of the display device 300. Figure 1A , Figure 1B The display device 100 and Figure 3A , Figure 3BThe difference between the display device 300 and the test structure 120 is the circuit pattern of the first bridging line B1 of the test structure 120 and the first bridging line B3 of the test structure 120a.

[0088] Please see Figure 3A and Figure 3B The first bridging line B3 has a rectangular wiring pattern, and unlike... Figure 1B The first bridging line B1 in the U-shape extends along the Y direction without exposing the openings or gaps in the underlying plane PS, the second inclined plane S2, and the second surface 116. It should be noted that the display device 300 can be covered with... Figure 2 The cover insulation layer 210 is used to prevent the risk of ESD damage to surrounding components and short circuits during subsequent manufacturing processes.

[0089] Figure 4A A three-dimensional perspective view of a display device 400 as shown in an embodiment of the present invention. Figure 4B for Figure 4A An unfolded view of the display device 400. Figure 3A , Figure 3B The display device 300 and Figure 4A , Figure 4B The difference between the display device 400 and the test structure 120a lies in the circuit patterns of the first bridging line B3 and the first bridging line B4 of the test structure 120b.

[0090] Please see Figure 4A and Figure 4B The first bridging line B1 extends from the second surface 116, passes through the second inclined plane S2 and the plane PS, and returns to the first inclined plane S1, but does not extend to the first surface 112. The first bridging line B1 has a rectangular circuit pattern, meaning that the first bridging line B1 extends along the Y direction without exposing the openings or gaps in the underlying first inclined plane S1, plane PS, second inclined plane S2, and second surface 116. It should be noted that a surface covering such a surface can be used on the display device 400. Figure 2 The insulating layer 210 is used to prevent the risk of ESD damage to surrounding components and short circuits during subsequent manufacturing processes.

[0091] Figure 5A A three-dimensional perspective view of a display device 500 as shown in an embodiment of the present invention. Figure 5B for Figure 5A An unfolded view of the display device 500. Figure 3A , Figure 3B The display device 300 and Figure 5A , Figure 5B The difference between the display device 500 and the test structure 120a lies in the circuit patterns of the first bridging line B3 and the first bridging lines B3 and B5 of the test structure 120c.

[0092] Please see Figure 5A and Figure 5B As shown, the first bridging line B5 extends from the second surface 116 to the second inclined surface S2, but does not extend to the plane PS, the first inclined surface S1, or the first surface 112. The first bridging line B1 has a rectangular circuit pattern, meaning that the first bridging line B1 extends along the Y direction without exposing the openings or gaps in the underlying second inclined surface S2 and the second surface 116. It should be noted that a surface covering such as... can be applied to the display device 400. Figure 2 The insulating layer 210 is used to prevent the risk of ESD damage to surrounding components and short circuits during subsequent manufacturing processes.

[0093] Figure 6 This is an unfolded view of a display device 600 according to an embodiment of the present invention. Figure 6 The unfolded diagram shown is similar to Figure 2 The unfolded diagram. Figure 2 The display device 100A and Figure 6 The difference between the display device 600 and the first test pad 124 and the second test pad 128 lies in their size (i.e., area) and position. Figure 6 The pattern of insulating layer 210a. Specifically, in Figure 6 In the display device 100A, the side 122s of the first contact pad 122 is flush with the side 124s of the first test pad 124, and the side 126s of the second contact pad 126 is flush with the side 128s of the second test pad 128. Similar to... Figure 2 Insulating layer 210, Figure 6 The insulating layer 210a also covers the first test pad 124 and the second test pad 128.

[0094] Figure 7 This is an unfolded view of a display device 700 according to an embodiment of the present invention. In detail, Figure 7 The display device 700 is made of Figure 6 The display device 600 is composed of repeating structures U. In other words, the display device 700 includes multiple test structures 120d. It should be noted that, due to viewing angle and for the sake of simplifying the drawings, some components (such as functional element 131) are not shown. Figure 7 middle.

[0095] The display device 700 includes a plurality of test structures 120d, wherein a plurality of first test pads 124 and a plurality of second test pads 128 of the plurality of test structures 120d are disposed on a second surface 116 and adjacent to a second inclined surface S2 of a side surface 114. The plurality of test structures 120d are arranged along the Y direction on both sides of the second surface 116 of the display panel 110. In other embodiments, the test structures 120d may be disposed only at the four corners of the display panel 110. The plurality of test structures 120d can increase the number of resistance value samples to increase numerical accuracy. For example, it can be used to detect whether the deformation of the display panel 110 exceeds specifications.

[0096] Figure 8 A three-dimensional perspective view of a display device 800 as shown in an embodiment of the present invention. Figure 1A The display device 100 and Figure 8 The difference in the display device 800 lies in its side surface 114. Specifically, the side surface 114 of the display device 800 is substantially perpendicular to the first surface 112 and the second surface 116. For example... Figure 8 As shown, the first bridging line B6 of the test structure 120e is distributed on the second surface 116 and the side surface 114, and the first bridging line B6 is not distributed on the first surface 112. (Similar to...) Figure 1A The first bridging line B6 of the display device 100 and the display device 800 is electrically connected to and covers the first contact pad 122 and the second contact pad 126.

[0097] Please refer to Figure 1A , Figure 3A , Figure 4A , Figure 5A as well as Figure 8 In some embodiments, the third test pad 134 at least partially overlaps with the fourth test pad 138 in direction Z, and the third contact pad 132 at least partially overlaps with the fourth contact pad 136 in direction Z. In some embodiments, a plurality of the aforementioned display devices 100, 300, 400, 500, 600, 700, and 800 form a splicing display, wherein the plurality of display devices are arranged regularly and interconnected with each other.

[0098] In summary, since the bridging circuit of the test structure of the present invention is far away from the electronic components in the display area, it can avoid damage to the electronic components in the adjacent area caused by ESD in the display device, thereby improving the manufacturing yield.

[0099] The foregoing overview of the features of various embodiments enables those skilled in the art to better understand the nature of the invention. Those skilled in the art will understand that the invention can be readily used as the basis for designing or modifying other manufacturing processes and structures to achieve the same objectives and / or benefits as the embodiments described herein. Those skilled in the art will also recognize that such equivalent constructions do not depart from the spirit and scope of the invention, and that various changes, substitutions, and modifications can be made without departing from the spirit and scope of the invention.

Claims

1. A display device comprising: The display panel has a first surface and a second surface opposite to each other, a side surface disposed between the first surface and the second surface, and a display area disposed on the first surface but not on the second surface and the side surface, the display area containing a pixel array; as well as The test structure includes: A first contact pad is disposed on the second surface; A first test pad is disposed on the second surface and electrically connected to the first contact pad; A second contact pad is disposed on the second surface; A second test pad is disposed on the second surface and electrically connected to the second contact pad; as well as A first bridging line is disposed on the display panel and electrically connects the first contact pad and the second contact pad. The first bridging line covers the first contact pad and the second contact pad. The first bridging line is distributed on the second surface and the side surface, and the first bridging line is not distributed on the first surface.

2. The display device as claimed in claim 1, wherein the side surface includes a first inclined surface, a plane and a second inclined surface, the plane is disposed between the first inclined surface and the second inclined surface, the first inclined surface is disposed between the first surface and the plane, and the second inclined surface is disposed between the second surface and the plane.

3. The display device of claim 2, wherein the first bridging line extends from the second surface to the second slope.

4. The display device of claim 2, wherein the first bridging line extends from the second surface through the second slope to the plane.

5. The display device of claim 2, wherein the first bridging line extends from the second surface through the second inclined plane and the plane to the first inclined plane.

6. The display device as claimed in claim 2, further comprising: Multiple test structures, wherein the first test pads and the second test pads of the test structures are disposed on the second surface and adjacent to the second inclined surface.

7. The display device of claim 1, wherein the side edge of the first contact pad is flush with the side edge of the first test pad, and the side edge of the second contact pad is flush with the side edge of the second test pad.

8. The display device of claim 1, further comprising: An insulating layer, wherein the insulating layer covers the peripheral area, the side surface, the first contact pad, the first test pad, the second contact pad, and the second test pad disposed on the first surface, wherein the display area further includes a functional element, the functional element being a gate drive array or a signal selector, wherein the insulating layer does not cover the functional element.

9. The display device of claim 1, further comprising: A third contact pad is disposed in the peripheral area of ​​the first surface, wherein the third contact pad is electrically connected to the pixel array; A fourth contact pad is disposed on the second surface; as well as The second bridging line electrically connects the third contact pad and the fourth contact pad, wherein the second bridging line extends from the first surface, through the side surface, and to the second surface.

10. A video wall display, comprising: A plurality of display devices as described in any one of claims 1 to 9, wherein the display devices are arranged in a regular manner and are interconnected with each other.

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