TW201931609A - A display device - Google Patents

Abstract

A display device includes: a first substrate, a second substrate and a display molecular layer disposed between said first substrate and said second substrate; a plurality of thin film transistors disposed on the display area of said second substrate; a plurality of data terminals disposed on the peripheral area of said second substrate and coupled to said thin film transistor; an insulating layer overlaying said data terminal; and a signal pad coupled to said data terminal via a contact hole formed in said insulating layer; wherein said signal pad is staggered with said data terminal toward the direction of said display area.

Description

Display device

The present invention relates to the field of display devices, and in particular, to the design of signal pads in display devices and a display device using signal pads.

A liquid crystal display (LCD) includes a first substrate, a second substrate, a display molecular material, and the like. In the production process of the display device, it is an important step to check the electrical characteristics of the first substrate. The prior art usually uses an Array Tester to use a jig to contact the test terminals (Array Test Pad, AT Pad) to write test signals into pixels in the first substrate and read electrical signals for detection and analysis. The test terminal includes a signal pad and a data terminal, wherein the signal pad is coupled through a contact hole of an insulation layer between the signal pad and the data terminal. After the first substrate and the second substrate are bonded, the signal pad will be completely covered by the sealing body in theory, but in actual production, due to the coating accuracy of the sealing body, the signal pad of some products is not completely covered and partially exposed. in the air. During the use of the product, water vapor in the air will electrochemically react with the signal pad, causing the signal pad to corrode, affecting the yield.

An embodiment of the present invention relates to a display device, including: a first substrate including adjacent display regions and a peripheral region; a second substrate including a plurality of color filter structures, and the color filter structure corresponds to the display region And provided; a sealing body provided in the peripheral region; a display molecular layer provided between the first substrate and the second substrate; a thin film transistor provided on the first substrate; a data terminal provided on The first substrate is coupled to the thin film transistor; an insulating layer covers the data terminal; a signal pad is connected to the data terminal through a contact hole, wherein the contact hole is formed in the insulating layer, And the sealing body covers the signal pad; wherein the signal pad is staggered from the data terminal toward the display area.

In the display device according to the embodiment of the present invention, a shape surrounded by an outer contour of the data terminal is the same as a shape surrounded by the signal pad.

In the display device according to the embodiment of the present invention, the signal pad is staggered from the data terminal to the display area by 50 to 70 μm , specifically 70 μm .

In the display device according to the embodiment of the present invention, the data terminal and the signal pad are completely covered by the sealing body.

In the display device according to the embodiment of the present invention, in a direction vertically projected on the first substrate, a partial area of the data terminal has an overlapping area with the sealing body.

In the display device according to the embodiment of the present invention, an outer edge of the sealing body is located between an outer edge of the data terminal and an outer edge of the signal pad in a direction perpendicular to the first substrate.

According to the display device of the embodiment of the present invention, the signal pad is a transparent conductive material, and the data terminal is a metal material.

In the display device according to the embodiment of the present invention, a shortest distance between an outer edge of the signal pad and an outer edge of the data terminal is 50 to 70 μm .

In the display device according to the embodiment of the present invention, a width of the signal pad is 100 μm .

100‧‧‧first substrate

200‧‧‧ second substrate

300‧‧‧ Display molecular layer

400‧‧‧Sealed body

500‧‧‧ display device

101‧‧‧ substrate

102‧‧‧ buffer layer

103‧‧‧First insulation layer

104‧‧‧first metal layer

105‧‧‧Second insulation layer

106‧‧‧Second metal layer

107‧‧‧third insulating layer

108‧‧‧ Fourth insulation layer

110‧‧‧test terminal

111‧‧‧data terminal

112‧‧‧Signal Pad

113‧‧‧ contact hole

114‧‧‧ opening

A1‧‧‧display area

A2‧‧‧Peripheral area

W _M2 ‧‧‧Data terminal width

W _ITO ‧‧‧ Width of Signal Pad

P‧‧‧ Edge position of the sealing body without deviation

D‧‧‧Distance between signal pad and data terminal

In order to make the above and other objects, features, functions, and embodiments of the present invention more comprehensible, the description of the drawings is as follows: FIG. 1 is a schematic top view of a display device according to the prior art.

FIG. 2 is a schematic partial cross-sectional view of a display device in which a sealing body fails to completely cover a signal pad according to the prior art.

FIG. 3 is a schematic partial cross-sectional view of a display device according to a first embodiment of the present invention where a signal pad and a data terminal are staggered.

FIG. 4 is a schematic plan view illustrating a signal pad and a data terminal staggered by 50 to 70 μm according to the first embodiment of the present invention.

FIG. 5 is a schematic partial cross-sectional view of the display device when the sealing body is accurately coated or shifted outward according to the second embodiment of the present invention.

FIG. 6 is a schematic plan view of the sealing body according to the second embodiment of the present invention when it is accurately coated or shifted outward.

In order to make the foregoing objects, features, and effects of the present invention more comprehensible, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. Numerous specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways than described herein. Those skilled in the art can make similar improvements without violating the meaning of the present invention. Therefore, the present invention is not subject to the specific embodiments disclosed below. limits.

See Figures 1 and 2. FIG. 1 is a schematic top view of the display device according to the prior art, and FIG. 2 is a partial cross-sectional view of the display device according to the prior art when the sealing body fails to completely cover the signal pad. As shown in FIGS. 1 and 2, a display device 500 mainly includes a first substrate 100 (such as a TFT substrate), a second substrate 200 (such as a CF substrate), and a display molecular layer 300. The first substrate 100 includes a substrate 101. , The buffer layer 102, the first insulating layer 103, the first metal layer 104, the second insulating layer 105, the second metal layer 106, the third insulating layer 107, and the fourth insulating layer 108. The first substrate 100 is further divided into a display area A1 and a peripheral area A2. The second substrate 200 includes a color filter structure and a light-shielding structure. The color filter structure has a plurality of color filter structures, and the light-shielding structures are arranged in different colors. Between the filter structures, the light-shielding structure and the color filter structure are omitted for the sake of clarity in illustration.

The position of the color filter structure of the second substrate 200 is set corresponding to the display area A1 of the first substrate 100, and the first substrate 100 and the second substrate 200 are assembled and bonded by the sealing body 400. The display molecular layer 300 is disposed between the first substrate 100 and the second substrate 200. Specifically, the display area A1 and the peripheral area A2 are bounded by the sealing body 400, and the display molecular layer 400 is disposed inside the sealing body 400 and corresponds to it. In display area A1. A thin film transistor (not shown) is disposed on the first substrate 100, and the thin film transistor It is formed by a multilayer structure and includes a first insulating layer 103, a first metal layer 104, a second insulating layer 105, a second metal layer 106, and the like. A test terminal 110 is provided in the peripheral area A2 of the first substrate 100, and the test terminal 110 includes a data terminal 111 and a signal pad 112. The signal pad 112 is coupled to the data terminal 111 through a contact hole 113. The contact hole 113 is formed in the first Three insulating layers 107 and a fourth insulating layer 108. In addition, the data terminal 111 is also coupled to a thin film transistor (not shown). When performing an electrical test, an array tester uses a jig to contact the signal pad 112, and then writes a test signal to the thin film transistor. Crystals (ie pixels in the display area) for detection analysis. After the electrical test is completed, the first substrate 100 and the second substrate 200 are assembled with each other by the sealing body 400. In this way, the sealing body 400 covers the signal pad 112, thereby protecting the signal pad 112 from contact with the external environment. Avoid being contaminated by water vapor and affecting yield.

Due to the limitation of the coating accuracy of the sealing body 400, coating deviations of the sealing body 400 may occur in the prior art, resulting in the sealing body 400 not being able to completely cover the signal pad 112, bringing the signal pad 112 into contact with the environment, and causing the signal pad 112 to be exposed to water. Air pollution, as shown in Figure 2. In FIG. 2, the dotted line P indicates the coating precision boundary, that is, when the coating precision of the sealing body 400 meets expectations, the outer edge of the sealing body will be substantially aligned with the coating precision boundary P. Therefore, when the sealing body 400 is coated unevenly, the outer edge of the sealing body is not aligned with the coating precise boundary P and cannot cover the signal pad 112. In this embodiment, the signal pad 112 is a transparent conductive material, and the data terminal 111 is a metal material, but the invention is not limited thereto.

See Figure 3. FIG. 3 is a schematic partial cross-sectional view of a display device according to a first embodiment of the present invention where a signal pad and a data terminal are staggered. As shown in FIG. 3, a display device 510 according to a first embodiment of the present invention has a structure mainly including a first substrate 100 (such as a TFT substrate), a second substrate 200 (such as a CF substrate), and Display molecular layer 300, where the first substrate 100 includes a substrate 101, a buffer layer 102, a first insulating layer 103, a first metal layer 104, a second insulating layer 105, a second metal layer 106, a third insulating layer 107, and a fourth Insulation layer 108. The first substrate 100 can be further divided into a display area A1 and a peripheral area A2. The second substrate 200 includes a color filter structure and a light-shielding structure. The color filter structure has a plurality of color filter structures, and the light-shielding structures are arranged in different colors. Filter structure, but for the sake of illustration, the light-shielding structure and color filter structure are omitted. The position of the color filter structure of the second substrate 200 is set corresponding to the display area A1 of the first substrate 100, and the first substrate 100 and the second substrate 200 are assembled and bonded by the sealing body 400. The display molecular layer 300 is disposed between the TFT substrate 100 and the CF substrate 200. Specifically, the display area A1 and the peripheral area A2 are bounded by the sealing body 400, and the display molecular layer 400 is disposed inside the sealing body 400 and corresponds to the display. Area A1. A thin-film transistor (not shown) is disposed on the first substrate 100, and the thin-film transistor is formed of a multilayer structure, including a first insulating layer 103, a first metal layer 104, a second insulating layer 105, a second metal layer 106, and the like. . A test terminal 110 is provided in the peripheral area A2 of the first substrate 100. The test terminal 110 includes a data terminal 111 and a signal pad 112. The signal pad 112 is coupled to the data terminal 111 through a contact hole 113. In addition, the data terminal 111 is also coupled to a thin film transistor (not shown). When performing an electrical test, an array tester uses a jig to contact the signal pad 112, and then writes a test signal to the thin film transistor. Crystals (ie pixels in the display area) for detection analysis. After the electrical test is completed, the first substrate 100 and the second substrate 200 are assembled with each other by the sealing body 400.

In this embodiment, the signal pad 112 and the data terminal 111 are adjusted to be staggered, so that the distance between the signal pad 112 and the edge of the sealing body 400 is extended, and the distance D is shifted toward the display area A1 (as compared with FIG. 2). ) To increase the coating bias The poor reserved space makes the signal pad 112 and the data terminal 111 partially overlap in the vertical projection direction, and partially does not overlap. In the embodiment shown in FIG. 3, when the coating body 400 has a deviation in the coating accuracy, that is, the outer edge of the sealing body 400 is not aligned with the coating precision boundary P, so that the sealing body 400 is relative to the coating. As for the precise boundary, it is closer to the display area A1. However, in this embodiment, the signal pad 112 and the data terminal 111 are staggered, so that the outer edge of the signal pad 112 is closer to the display area A1 than the outer edge of the data terminal 11. Therefore, once the sealing body 400 is coated unevenly, the signal pad 112 can still be covered to avoid corrosion problems.

Please refer to FIG. 4 at the same time. FIG. 4 is a schematic plan view of a signal pad and a data terminal staggered by 50 to 70 μm according to the first embodiment of the present invention. In order to clearly express the relative positional relationship between the signal pad 112, the data terminal 111, and the sealing body 400, only some components are shown in FIG. 4, but from the above paragraph and FIG. 2, the signal pad 112, the data terminal 111, and the seal can be understood. There are other levels beyond the body 400. Please correspond to the embodiments of FIG. 3 and FIG. 4 at the same time, the signal pad 112 and the data terminal 111 are staggered, so that the signal pad 112 and the data terminal overlap in a vertical projection direction, and some areas overlap, and some areas do not overlap. In this way, the outer edge of the sealing body 400 is between the outer edge of the signal pad 112 and the outer edge of the data terminal 111, that is, in the vertical projection direction, the sealing body 400 can cover the signal pad 112 and not completely cover the data terminal 111. At the same time, in order to consider the reliability of the coupling between the signal pad 112 and the data terminal 111, as well as the production process, and also take into account the application of the narrow frame model, the width W _{M2 of the} data terminal 111 is equal to the width W _{ITO of the} signal pad 112 That is, the area of the signal pad 112 remains unchanged, so that in the vertical projection direction, the area enclosed by the outer outline of the signal pad 112 is the same as the area enclosed by the outer outline of the data terminal 111 and has the same shape.

Please refer to FIG. 4 again. FIG. 4 is a schematic plan view showing that the signal pad and the data terminal are staggered by 50 to 70 μm according to the first embodiment of the present invention. In another embodiment of the present invention, the distance between the signal pad 112 and the data terminal 111 is D (ie, the offset distance D in FIG. 3), and D falls between 50 μm and 70 μm. In detail, the distance D is the shortest distance between the outer edge of the signal pad 112 and the outer edge of the data terminal 111. When 50μm D At 70 μm, it is shown in Figure 4. The signal pad 112 is shifted in the direction of the display area A1, and the distance from the edge of the signal pad 112 to the edge of the sealing body 400 increases by more than 50 μm. At this time, the signal pad 112 covers the contact hole 113, so that the signal pad 112 can still be coupled to the data terminal 111 through the contact hole 113. Then, the dashed portion in FIG. 3 represents a part of the outline of the data terminal (covered by the signal pad 112 and expressed by a dashed line). When the coating of the sealing body 400 meets the accuracy requirement of less than 50 μm, even if the coating of the sealing body 400 reaches the maximum deviation, that is, when the sealing body 400 is shifted to the display area A1 direction by 50 μm when the coating is applied, the signal can still be ensured. The pad 112 is completely covered by the sealing body 400, or a part of the structure of the signal pad 112 is covered by the sealing body 400 (the remaining portion thereof is within the display area A1). In this way, the signal pad 112 is not in contact with the external environment, which prevents the signal pad 112 from being polluted by water and gas.

In another embodiment of the present invention, the width W _{M2 of the} data terminal 111 is equal to the width W _{ITO of the} signal pad 112 and both are 100 μm. When 50μm D At 70 μm, it is shown in Figure 4. The signal pad 112 is shifted toward the display area A1. At this time, the data terminal 111 and the signal pad 112 maintain an overlapping area with a width of 30-50 μm, so that the signal pad 112 can still be coupled to the data terminal 111 through the contact hole 113.

See Figure 5. FIG. 5 is a schematic partial cross-sectional view of the display device when the sealing body is accurately coated or shifted outward according to the second embodiment of the present invention. As shown in FIG. 5, a display device according to a second embodiment of the present invention, wherein the structure of the display device is the same as the embodiment of FIG. 3 described above, and details are not described herein. In this embodiment, the The distance between the signal pad 112 and the data terminal 111 is adjusted to be staggered, so that the distance between the signal pad 112 and the edge of the sealing body 400 is extended, and the distance D is shifted to the direction of the display area A1, so as to increase the reserved space to accommodate the coating body deviation. The difference between this embodiment and the embodiment of FIG. 3 lies in that the coating accuracy of the sealing body 400 is consistent with the setting, that is, the outer edge of the sealing body 400 is substantially aligned with the coating precision boundary P. In other words, in the embodiment of the present invention, regardless of whether the coating accuracy of the sealing body 400 is consistent with the setting (as shown in the embodiment of FIG. 5) or the deviation (as shown in the embodiment of FIG. 3), It is ensured that the outer edge of the signal pad 112 can be covered by the sealing body 400, and the problem of corrosion of the signal pad 112 does not occur.

See also Figure 6. FIG. 6 is a schematic plan view of the sealing body according to the second embodiment of the present invention when it is accurately coated or shifted outward. In order to clearly express the relative positional relationship between the signal pad 112, the data terminal 111, and the sealing body 400, only some components are shown in FIG. 6, but from the above paragraph and FIG. 5, the signal pad 112, the data terminal 111, and the seal can be understood. There are other levels beyond the body 400. Please correspond to the embodiments of FIG. 5 and FIG. 6 at the same time. The signal pad 112 and the data terminal 111 are staggered, so that the signal pad 112 and the data terminal overlap in a vertical projection direction, and some areas overlap, and some areas do not overlap. In this way, the outer edge of the sealing body 400 is outside the outer edge of the signal pad 112 and the outer edge of the data terminal 111, that is, in a vertical projection direction, the sealing body 400 covers the signal pad 112 and the data terminal 111. In other words, in this embodiment, when the coating accuracy of the sealing body 400 is consistent with the setting or the offset direction is toward the peripheral area A2, the signal pad 112 is completely covered by the sealing body 400, or the signal pad 112 Part of the structure is covered by the sealing body 400 (the rest of the structure is in the display area A1). In this way, the signal pad 112 is not in contact with the external environment, which prevents the signal pad 112 from being polluted by water and gas.

Please refer to Figure 6 again. FIG. 6 is a diagram of a second embodiment of the present invention. A schematic plan view of the seal when it is accurately coated or shifted outward. In this embodiment, the shape and area of the signal pad 112 and the data terminal 111 are set to be the same, and the signal pad 112 is shifted from the data terminal 111 to the display area A1 by 50 to 70 μm (that is, the distance D in FIG. 6 falls between 50 μm and 70 μm between). At this time, the signal pad 112 remains coupled to the data terminal 111 through the contact hole 113, and the signal pad 112 is completely covered by the sealing body 400, or a part of the structure of the signal pad 112 is covered by the sealing body 400 (the remaining part is in the display area A1) In order to avoid the signal pad 112 being polluted by water and gas.

In other embodiments, the data terminal is further provided with an opening 114, and when the signal pad 112 and the data terminal 111 are staggered, from a vertical projection direction, the signal pad 112 and the opening 114 partially overlap or do not overlap, as shown in FIG. 6 The dotted line portion displayed by the opening 114 is a state where the opening 114 and the signal pad 112 partially overlap, but the present invention is not limited thereto. In addition, in the embodiments of FIG. 4 and FIG. 6, the sealing body 400 is illustrated as a rectangular structure for the convenience of description. However, those having ordinary knowledge in the technical field should understand that the sealing body 400 is usually used in actual applications. The display area A1 is surrounded in a closed shape (such as a mouth shape). Meanwhile, FIG. 4 and FIG. 6 respectively show three and one test terminals, which are for convenience of description only, but the present invention is not limited thereto.

Although the present invention has been disclosed as above with the examples, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field can make some modifications and retouching without departing from the spirit and scope of the present invention. The protection scope of the present invention shall be determined by the scope of the attached patent application.

Claims (13)

A display device includes: a first substrate including an adjacent display area and a peripheral area; a second substrate including a plurality of color filter structures, and the color filter structures are provided corresponding to the display area; A sealing body is disposed in the peripheral region; a display molecular layer is disposed between the first substrate and the second substrate; a thin film transistor is disposed on the first substrate; a data terminal is disposed on the first substrate; A substrate, which is coupled to the thin film transistor; an insulating layer covering the data terminal; and a signal pad, which is coupled to the data terminal through a contact hole, wherein the contact hole is formed in the insulating layer and the A sealing body covers the signal pad, wherein the signal pad is disposed staggered from the data terminal in a direction toward the display area. The display device according to claim 1, wherein the shape enclosed by the outer contour of the data terminal is the same as the shape enclosed by the signal pad. For example, the display device of claim 1 is characterized in that the signal pad is offset from the data terminal by 50 to 70 μm in the direction of the display area. For example, the display device of claim 2, wherein the signal pad is staggered 70 μm away from the data terminal toward the display area. The display device of claim 1 or 2 or 3, wherein the data terminal and the signal pad are completely covered by the sealing body. The display device as claimed in claim 1 or 2 or 3, wherein in a direction perpendicular to the first substrate, a part of the data terminal There is an overlapping area with the sealing body. The display device as claimed in claim 1, wherein an outer edge of the sealing body is located between an outer edge of the data terminal and an outer edge of the signal pad in a direction perpendicular to the first substrate. The display device of claim 1, wherein the signal pad is a transparent conductive material, and the data terminal is a metal material. For example, the display device of claim 1, wherein the shortest distance between the outer edge of the signal pad and the outer edge of the data terminal is 50 ~ 70 μm. The display device of claim 1, wherein the width of the signal pad is 100 μm. A display device includes: a first substrate including an adjacent display area and a peripheral area; a second substrate including a plurality of color filter structures, and the color filter structures are provided corresponding to the display area; A sealing body is disposed in the peripheral region; a display molecular layer is disposed between the first substrate and the second substrate; a thin film transistor is disposed on the first substrate; a data terminal is disposed on the first substrate; A substrate, which is coupled to the thin film transistor; an insulating layer covering the data terminal; and a signal pad, which is coupled to the data terminal through a contact hole, wherein the contact hole is formed in the insulating layer and the The sealing body covers the signal pad; wherein, in a vertical projection direction, the area of the signal pad and the data terminal partially overlaps. The display device as claimed in claim 11, wherein the data terminal The shape enclosed by the outer contour of the sub is the same as the shape enclosed by the signal pad. The display device according to claim 11, wherein an outer edge of the sealing body is located between an outer edge of the data terminal and an outer edge of the signal pad in a direction perpendicular to the first substrate.