TWI813503B - Display apparatus - Google Patents

Abstract

A display apparatus includes a substrate, a pixel structure, a metal layer, a first anti-oxidation conductive layer and an insulating layer. The substrate has a display surfaces and a back surface opposite to each other. The pixel structure is disposed on the display surface of the substrate. The metal layer is disposed on the back surface of the substrate, and includes an island-shaped test pad, a first segment of a trace and a second segment of the trace. The first segment and the second segment of the trace are respectively located on both sides of the island-shaped test pad and are structurally separated with the island-shaped test pad. The first anti-oxidation conductive layer is disposed on the back surface and includes a first bridge pattern and a second bridge pattern. The first bridge pattern is connected between the first segment of the trace and the island-shaped test pad. The second bridge pattern is connected between the second segment of the trace and the island-shaped test pad. The insulating layer is disposed on the first anti-oxidation conductive layer and has an opening. The opening of the insulating layer overlaps the island-shaped test pad.

Description

display device

The present invention relates to an optoelectronic device, and in particular to a display device.

The light-emitting diode display panel includes a backplane and a plurality of light-emitting diode elements transferred on the backplane. Inheriting the characteristics of light-emitting diodes, light-emitting diode display panels have the advantages of power saving, high efficiency, high brightness and fast response time. In addition, compared with organic light-emitting diode display panels, light-emitting diode display panels also have the advantages of easy color adjustment, long luminous life, and no image imprinting. Therefore, light-emitting diode display panels are regarded as the next generation of display technology.

Generally speaking, in order to realize an ultra-narrow bezel or even a bezel-less LED display panel, peripheral circuits (such as fan-out traces, test pads, etc.) are made on the back of the backplane, and then peelable glue is used. Cover and protect it. The peelable adhesive layer has an opening that overlaps the test pad to facilitate the insertion of the probe of the test machine for electrical testing. During electrical testing, the test pads are easily damaged by probes, causing corrosion of the LED display panel at the test pads and spreading to the inside of the fan-out traces after subsequent reliability testing.

The present invention provides a display device with good quality and high yield.

The display device of the present invention includes a substrate, a pixel structure, a metal layer, a first anti-oxidation conductive layer and an insulating layer. The substrate has an opposite display surface and a back surface. The pixel structure is arranged on the display surface of the substrate. The metal layer is disposed on the back side of the substrate and includes an island-shaped test pad, a first section of the trace, and a second section of the trace. The first section and the second section of the trace are respectively located on both sides of the island-shaped test pad. Structurally separated from the island test pad. The first anti-oxidation conductive layer is disposed on the back and includes a first bridge pattern and a second bridge pattern, wherein the first bridge pattern is connected between the first section of the trace and the island test pad, and the second bridge pattern is connected between Between the second segment of the trace and the island test pad. The insulating layer is disposed on the first anti-oxidation conductive layer and has an opening, wherein the opening of the insulating layer overlaps the island-shaped test pad.

In an embodiment of the present invention, the above-mentioned display device further includes a peelable adhesive layer disposed on the insulating layer and having an opening, wherein the opening of the peelable adhesive layer overlaps the island-shaped test pad.

In an embodiment of the present invention, the openings of the peelable adhesive layer further overlap the first bridge pattern and the second bridge pattern of the first anti-oxidation conductive layer.

In an embodiment of the present invention, the above-mentioned metal layer is located between the first anti-oxidation conductive layer and the back surface of the substrate. The first anti-oxidation conductive layer further includes an anti-oxidation conductive pattern, which is disposed on the island-shaped test pad of the metal layer, wherein the openings of the peelable adhesive layer, the openings of the insulating layer overlap with the anti-oxidation conductive pattern.

In an embodiment of the present invention, the above-mentioned first bridge pattern and the second bridge pattern are respectively disposed on both sides of the anti-oxidation conductive pattern and are structurally separated from the anti-oxidation conductive pattern.

In an embodiment of the present invention, the above-mentioned metal layer is located between the first anti-oxidation conductive layer and the back surface of the substrate. The display device further includes a second anti-oxidation conductive layer disposed between the metal layer and the back side of the substrate, wherein the first section of the trace of the metal layer has a first gap with the island-shaped test pad of the metal layer, and the trace of the metal layer The second section and the island-shaped test pad of the metal layer have a second gap, the second anti-oxidation conductive layer has a first area and a second area respectively overlapping the first gap and the second gap, the first anti-oxidation conductive layer The first bridge pattern and the second bridge pattern are respectively disposed in the first gap and the second gap and are electrically connected to the first region and the second region of the second anti-oxidation conductive layer respectively.

In one embodiment of the present invention, the above-mentioned second anti-oxidation conductive layer further has a third region, which overlaps the island-shaped test pad of the metal layer; both ends of the third region are connected to the first region and the second region respectively.

In an embodiment of the present invention, the above-mentioned first anti-oxidation conductive layer is located between the metal layer and the back surface of the substrate.

In one embodiment of the present invention, the above-mentioned first anti-oxidation conductive layer further includes an anti-oxidation conductive pattern, wherein the island-shaped test pads of the metal layer are disposed on the anti-oxidation conductive pattern of the first anti-oxidation conductive layer, and the anti-oxidation conductive pattern Both ends of the conductive pattern are connected to the first bridge pattern and the second bridge pattern respectively.

Reference will now be made in detail to the exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Whenever possible, the same reference numbers are used in the drawings and descriptions to refer to the same or similar parts.

It will be understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "connected to" another element, it can be directly on or connected to the other element, or Intermediate elements may also be present. In contrast, when an element is referred to as being "directly on" or "directly connected to" another element, there are no intervening elements present. As used herein, "connected" may refer to a physical and/or electrical connection. Furthermore, "electrical connection" or "coupling" may mean the presence of other components between two components.

As used herein, "about," "approximately," or "substantially" includes the stated value and the average within an acceptable range of deviations from the particular value as determined by one of ordinary skill in the art, taking into account the measurements in question and the A specific amount of error associated with a measurement (i.e., the limitations of the measurement system). For example, "about" may mean within one or more standard deviations of the stated value, or within ±30%, ±20%, ±10%, ±5%. Furthermore, the terms "about", "approximately" or "substantially" used herein may be used to select a more acceptable deviation range or standard deviation based on optical properties, etching properties or other properties, and one standard deviation may not apply to all properties. .

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be construed to have meanings consistent with their meanings in the context of the relevant technology and the present invention, and are not to be construed as idealistic or excessive Formal meaning, unless expressly defined as such herein.

FIG. 1 is a schematic bottom view of the display device according to the first embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of the display device according to the first embodiment of the present invention. Figure 2 corresponds to the cross-section line A-A’ of Figure 1. The direction Z points from the back surface 114 of the substrate 110 to the display surface 112 . FIG. 1 shows the display device 10 as viewed along a direction parallel to the direction Z. As shown in FIG.

Referring to FIGS. 1 and 2 , the display device 10 includes a substrate 110 with an opposite display surface 112 and a back surface 114 . In this embodiment, the material of the substrate 110 may be glass, quartz, organic polymer, or opaque/reflective material (such as wafer, ceramic, or other applicable materials), or other applicable materials. Material.

The display device 10 further includes a pixel structure 120 disposed on the display surface 112 of the substrate 110 . For example, in this embodiment, the pixel structure 120 may include a pixel driving circuit (not shown), a pad (not shown) electrically connected to the pixel driving circuit, and a light-emitting diode connected to the pad. Polar body element (not shown), but the invention is not limited thereto.

Display device 10 also includes metal layer 140 . The metal layer 140 is disposed on the back surface 114 of the substrate 110 . In this embodiment, the display device 10 may also optionally include a barrier protection layer 130, where the barrier protection layer 130 is disposed on the backside 114 of the substrate 110, and the metal layer 140 is disposed on the barrier protection layer 130. However, the present invention does not This is the limit. In this embodiment, the material of the barrier protective layer 130 may be an inorganic material (for example, silicon oxide, silicon nitride, silicon oxynitride, or a stacked layer of at least two of the above materials), an organic material, or a combination thereof.

The metal layer 140 includes an island-shaped test pad 142, a first section 144 of the trace L, and a second section 146 of the trace L. The first section 144 and the second section 146 of the trace L are respectively located on both sides of the island-shaped test pad 142 and are structurally separated from the island-shaped test pad 142 . The first section 144 of the trace L and the island test pad 142 have a first gap g1. The second section 146 of the trace L and the island-shaped test pad 142 of the metal layer 140 have a second gap g2. In this embodiment, the metal layer 140 may also optionally include a test pad 148, in which one end 146a of the second section 146 of the trace L has a second gap g2 with the island-shaped test pad 142, and the second section 146 of the trace L has a second gap g2. The other end 146b of 146 is connected to test pad 148.

The trace L provided on the back surface 114 of the substrate 110 is electrically connected to the pixel structure 120 provided on the display surface 112 of the substrate 110 . In this embodiment, the traces L provided on the back surface 114 of the substrate 110 can pass through side wires (not shown) provided on the side walls (not shown) of the substrate 110 or conductive objects (not shown) penetrating the substrate 110 ) is electrically connected to the pixel structure 120 provided on the display surface 112 of the substrate 110, but the invention is not limited thereto. In this embodiment, the material of the metal layer 140 may be aluminum, copper or other metals, but the invention is not limited thereto.

The display device 10 further includes a first anti-oxidation conductive layer 150 disposed on the back surface 114 of the substrate 110 . In this embodiment, the first anti-oxidation conductive layer 150 can be selectively disposed on the metal layer 140, where the metal layer 140 is located between the first anti-oxidation conductive layer 150 and the back surface 114 of the substrate 110. However, the present invention does not use This is the limit.

The first anti-oxidation conductive layer 150 includes first bridge patterns 154 and second bridge patterns 156 . The first bridge pattern 154 is connected between the first section 144 of the trace L and the island test pad 142 to electrically connect the first section 144 of the trace L and the island test pad 142 . The second bridge pattern 156 is connected between the second section 146 of the trace L and the island test pad 142 to electrically connect the second section 146 of the trace L and the island test pad 142 . Compared with the metal layer 140 , the first anti-oxidation conductive layer 150 is less susceptible to oxidation reactions. For example, in this embodiment, the material of the first anti-oxidation conductive layer 150 can be metal oxide, such as but not limited to: indium tin oxide, indium zinc oxide, aluminum tin oxide, aluminum zinc oxide, Indium germanium zinc oxide, other suitable oxides, or a stack of at least two of the above.

In this embodiment, the first anti-oxidation conductive layer 150 may also optionally include an anti-oxidation conductive pattern 152 disposed on the island-shaped test pad 142 of the metal layer 140 . The first bridge pattern 154 and the second bridge pattern 156 are respectively disposed on both sides of the anti-oxidation conductive pattern 152 . In this embodiment, the anti-oxidation conductive pattern 152 can be selectively structurally separated from the first bridge pattern 154 and the second bridge pattern 156, but the invention is not limited thereto.

In this embodiment, the first anti-oxidation conductive layer 150 may also optionally include another anti-oxidation conductive pattern 158 disposed on the test pad 148 of the metal layer 140 , wherein the second bridge pattern 156 is located on the anti-oxidation conductive pattern 152 and another anti-oxidation conductive pattern 158 . In this embodiment, the second bridge pattern 156 and the anti-oxidation conductive pattern 152 and the other anti-oxidation conductive pattern 158 can be selectively separated structurally, but the invention is not limited thereto.

The display device 10 further includes an insulating layer 160 disposed on the first anti-oxidation conductive layer 150 and having an opening 160 a , wherein the opening 160 a of the insulating layer 160 overlaps the island-shaped test pad 142 . In this embodiment, the opening 160a of the insulating layer 160 further overlaps the anti-oxidation conductive pattern 152. The anti-oxidation conductive pattern 152 covers the area of the island test pad 142 that overlaps the opening 160a. In this embodiment, the opening 160a of the insulating layer 160 can expose the anti-oxidation conductive pattern 152, but the invention is not limited thereto.

In this embodiment, the insulating layer 160 may also have another opening 160b, wherein the opening 160a of the insulating layer 160 overlaps the test pad 148. In this embodiment, another opening 160b of the insulating layer 160 further overlaps another anti-oxidation conductive pattern 158. Another anti-oxidation conductive pattern 158 covers the area of the test pad 148 that overlaps the other opening 160b. In this embodiment, the material of the insulating layer 160 may be an inorganic material (for example, silicon oxide, silicon nitride, silicon oxynitride, or a stacked layer of at least two of the above materials), an organic material, or a combination thereof. In this embodiment, the insulating layer 160 may include multiple insulating sub-layers, but the invention is not limited thereto.

In this embodiment, the display device 10 further includes a peelable adhesive layer 170 , which is disposed on the insulating layer 160 and has an opening 170 a , where the opening 170 a of the peelable adhesive layer 170 overlaps the island-shaped test pad 142 . In this embodiment, the opening 170a of the peelable adhesive layer 170, the opening 160a of the insulating layer 160 overlap with the anti-oxidation conductive pattern 152. In this embodiment, the opening 170a of the peelable adhesive layer 170 further overlaps the first bridge pattern 154 and the second bridge pattern 156 of the first anti-oxidation conductive layer 150, and the opening 160a of the insulating layer 160 is located on the first bridge pattern 154 and the second bridge pattern 156 . In this embodiment, the opening 160a of the insulating layer 160 is located within the opening 170a of the peelable adhesive layer 170 and communicates with the opening 170a of the peelable adhesive layer 170. In this embodiment, the peelable adhesive layer 170 can be filled into the other opening 160b of the insulating layer 160 . In this embodiment, the peelable adhesive layer 170 filled in the other opening 160b of the insulating layer 160 can be in contact with another anti-oxidation conductive pattern 158, but the invention is not limited thereto.

It is worth noting that, in addition to the first bridge pattern 154 and the second bridge pattern 156 of the first anti-oxidation conductive layer 150, which are used to bridge the island test pad 142 and the first section 144 and the second section 146 of the trace L, the first The first bridge pattern 154 and the second bridge pattern 156 of the anti-oxidation conductive layer 150 are also used to separate the island-shaped test pads 142 of the metal layer 140 and the traces L of the metal layer 140 . In this way, even if water vapor enters the metal layer 140 from the island-shaped test pad 142 that is not covered by the peelable adhesive layer 170, the first bridge pattern 154 and the second bridge pattern 156 of the first anti-oxidation conductive layer 150 can prevent water vapor from entering the metal layer 140. The water vapor is prevented from entering the interior of the trace L covered by the peelable adhesive layer 170 . Even if the island-shaped test pad 142 of the metal layer 140 is corroded due to oxidation, the corrosion phenomenon will not easily pass through the first bridge pattern 154 and the second bridge pattern 156 of the first anti-oxidation conductive layer 150 and spread to the metal. 40 trace L internal. Thereby, the quality and yield of the display device 10 can be improved.

It must be noted here that the following embodiments follow the component numbers and part of the content of the previous embodiments, where the same numbers are used to represent the same or similar elements, and descriptions of the same technical content are omitted. For descriptions of omitted parts, reference may be made to the foregoing embodiments and will not be repeated in the following embodiments.

FIG. 3 is a schematic cross-sectional view of a display device according to a second embodiment of the present invention. The display device 10A of FIG. 3 is similar to the aforementioned display device 10 . The difference between the two is that the display device 10A of FIG. 3 further includes a second anti-oxidation conductive layer 180 .

Referring to FIG. 3 , the second anti-oxidation conductive layer 180 is disposed between the metal layer 140 and the back surface 114 of the substrate 110 . Specifically, in this embodiment, the second anti-oxidation conductive layer 180 can be disposed on the barrier protective layer 130, but the invention is not limited thereto. The first section 144 of the trace L of the metal layer 140 and the island-shaped test pad 142 of the metal layer 140 have a first gap g1. The second section 146 of the trace L of the metal layer 140 and the island-shaped test pad 142 of the metal layer 140 have a second gap g2. The second anti-oxidation conductive layer 180 has a first region 184 and a second region 186 respectively overlapping the first gap g1 and the second gap g2. The first bridge pattern 154 and the second bridge pattern 156 of the first anti-oxidation conductive layer 150 are respectively disposed in the first gap g1 and the second gap g2 and are electrically connected to the first region 184 and the second region 184 of the second anti-oxidation conductive layer 180 respectively. District 2 186.

In this embodiment, the second anti-oxidation conductive layer 180 may also have a third region 182 that overlaps the island-shaped test pad 142 of the metal layer 140; both ends of the third region 182 are connected to the first region 184 and the second region respectively. 186 connections. Compared with the metal layer 140, the second anti-oxidation conductive layer 180 is less susceptible to oxidation reactions. For example, in this embodiment, the material of the second anti-oxidation conductive layer 180 can be metal oxide, such as but not limited to: indium tin oxide, indium zinc oxide, aluminum tin oxide, aluminum zinc oxide, Indium germanium zinc oxide, other suitable oxides, or a stack of at least two of the above.

It is worth mentioning that in this embodiment, a double-layered first anti-oxidation conductive layer 150 and a second anti-oxidation conductive layer 180 are used to bridge the island test pad 142 and the first section 144 and the second section of the trace L 146 can reduce the resistance, thereby improving the performance of the display device 10A.

FIG. 4 is a schematic cross-sectional view of a display device according to a third embodiment of the present invention. The display device 10B of FIG. 4 is similar to the aforementioned display device 10. The difference between the two lies in the position of the first anti-oxidation conductive layer 150B of the display device 10B of FIG. 4 and the first anti-oxidation conductive layer 150 of the aforementioned display device 10. The location is different.

Please refer to FIG. 4 . Specifically, in this embodiment, the first anti-oxidation conductive layer 150B is located between the metal layer 140 and the back surface 114 of the substrate 110 . In this embodiment, the island-shaped test pads 142 of the metal layer 140 are disposed on the anti-oxidation conductive pattern 152B of the first anti-oxidation conductive layer 150B, and the two ends of the anti-oxidation conductive pattern 152B are respectively connected to the first bridge pattern 154B and the second bridge pattern 154B. Two bridge patterns 156B are connected. In this embodiment, the first anti-oxidation conductive layer 150B is formed first, and then the metal layer 140 is formed. The island-shaped test pad 142 of the metal layer 140 and the first section 144 and the second section 146 of the trace L are formed using the first The formed first anti-oxidation conductive layer 150B is electrically connected.

10, 10A, 10B: display device 110:Substrate 112:Display surface 114:Back 120: Pixel structure 130: Barrier protection layer 140:Metal layer 142:Island test pad 144: First paragraph 146:Second paragraph 146a, 146b: end 148:Test pad 150, 150B: First anti-oxidation conductive layer 152, 152B: Anti-oxidation conductive pattern 154, 154B: first bridge pattern 156, 156B: Second bridge pattern 158:Another antioxidant conductive pattern 160: Insulation layer 160a, 170a: opening 160b:Another opening 170: Peelable adhesive layer 180: Second anti-oxidation conductive layer 182:The third area 184: District 1 186:Second District A-A’: section line L: routing g1: first gap g2: second gap Z: direction

FIG. 1 is a schematic bottom view of the display device according to the first embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of the display device according to the first embodiment of the present invention. FIG. 3 is a schematic cross-sectional view of a display device according to a second embodiment of the present invention. FIG. 4 is a schematic cross-sectional view of a display device according to a third embodiment of the present invention.

10:Display device

110:Substrate

112:Display surface

114:Back

120: Pixel structure

130: Barrier protection layer

140:Metal layer

142:Island test pad

144: First paragraph

146:Second paragraph

146a, 146b: end

148:Test pad

150: First anti-oxidation conductive layer

152: Anti-oxidation conductive pattern

154: First bridge pattern

156: Second bridge pattern

158:Another antioxidant conductive pattern

160: Insulation layer

160a, 170a: opening

160b:Another opening

170: Peelable adhesive layer

A-A’: section line

L: routing

g1: first gap

g2: second gap

Z: direction

Claims (9)

A display device including: A substrate having an opposite display surface and a back surface; A pixel structure is provided on the display surface of the substrate; A metal layer is provided on the back side of the substrate and includes an island-shaped test pad, a first section of a trace and a second section of the trace, wherein the first section of the trace and the third section of the trace The two sections are respectively located on both sides of the island-shaped test pad and are structurally separated from the island-shaped test pad; A first anti-oxidation conductive layer is provided on the backside and includes a first bridge pattern and a second bridge pattern, wherein the first bridge pattern is connected between the first section of the trace and the island test pad. space, and the second bridge pattern is connected between the second section of the trace and the island test pad; and An insulating layer is disposed on the first anti-oxidation conductive layer and has an opening, wherein the opening of the insulating layer overlaps the island-shaped test pad. The display device as described in claim 1 further includes: A peelable adhesive layer is provided on the insulating layer and has an opening, wherein the opening of the peelable adhesive layer overlaps the island-shaped test pad. The display device of claim 2, wherein the opening of the peelable adhesive layer further overlaps the first bridge pattern and the second bridge pattern of the first anti-oxidation conductive layer. The display device of claim 2, wherein the metal layer is located between the first anti-oxidation conductive layer and the back surface of the substrate, and the first anti-oxidation conductive layer further includes: An anti-oxidation conductive pattern is provided on the island-shaped test pad of the metal layer, wherein the opening of the peelable adhesive layer, the opening of the insulating layer overlap with the anti-oxidation conductive pattern. The display device of claim 4, wherein the first bridge pattern and the second bridge pattern are respectively disposed on both sides of the anti-oxidation conductive pattern and are structurally separated from the anti-oxidation conductive pattern. The display device of claim 1, wherein the metal layer is located between the first anti-oxidation conductive layer and the back surface of the substrate, the display device further includes: A second anti-oxidation conductive layer is disposed between the metal layer and the back side of the substrate, wherein the first section of the trace of the metal layer and the island-shaped test pad of the metal layer have a first gap , the second section of the trace of the metal layer and the island-shaped test pad of the metal layer have a second gap, and the second anti-oxidation conductive layer has respectively overlapping the first gap and the second gap. A first region and a second region, the first bridge pattern and the second bridge pattern of the first anti-oxidation conductive layer are respectively disposed in the first gap and the second gap and are electrically connected to the second gap respectively. The first region and the second region of the oxidation-resistant conductive layer. The display device of claim 6, wherein the second anti-oxidation conductive layer further has a third area that overlaps the island-shaped test pad of the metal layer; two ends of the third area are respectively connected with the first area. and the second area connection. The display device of claim 1, wherein the first anti-oxidation conductive layer is located between the metal layer and the back surface of the substrate. The display device of claim 8, wherein the first anti-oxidation conductive layer further includes: An anti-oxidation conductive pattern, wherein the island-shaped test pad of the metal layer is disposed on the anti-oxidation conductive pattern of the first anti-oxidation conductive layer, and both ends of the anti-oxidation conductive pattern are respectively connected to the first bridge pattern and The second bridge pattern is connected.

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