Display panel and display device

Abstract

The present invention provides a display panel and a display device. The display panel includes: a plurality of first detection TFTs and at least one second detection TFT located in a non-display area, the first detection TFT being electrically connected to pixels in the display area, the second detection TFT not being electrically connected to pixels in the display area, the channel width of the second detection TFT being smaller than the channel width of the first detection TFT; a detection pad, the detection pad including a first detection pad block and a second detection pad block, the first detection pad block being electrically connected to the drain of the first detection TFT and the drain of the second detection TFT, the second detection pad block being electrically connected to the gate of the first detection TFT and the gate of the second detection TFT. Static electricity is more likely to break down the channel of the second detection TFT, so the second detection TFT can be used to protect the first detection TFT, thereby not affecting the display quality of the display panel.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a display panel and a display device. Background Art

[0002] A SW structure (Switch, a TFT structure) is usually set in the display panel. After the array substrate is manufactured, an electric detection circuit is connected on the glass to improve the yield of the substrate. When the substrate becomes a display screen after subsequent processes such as module, the SW structure no longer works and needs to be kept normally closed. Once a short circuit occurs, abnormal display will occur. Since the SW structure needs to be connected to the outside of the substrate (connected to the detection circuit), there is a fracture after cutting and the test pad of the top-level detection circuit is exposed on the surface, static electricity is often introduced into the SW structure. After being affected by static electricity, the SW structure is damaged. During continuous operation, voltage is continuously applied to the source and drain of the TFT in the display area, causing the damaged part to deteriorate and cause a short circuit, resulting in abnormal display. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, one object of the present invention is to provide a display panel that can effectively avoid the influence of static electricity on TFTs in a display area, thereby avoiding short circuits.

[0004] In one aspect of the present invention, the present invention provides a display panel. According to an embodiment of the present invention, the display panel includes: a plurality of first detection TFTs and at least one second detection TFT located in a non-display area, the first detection TFT being electrically connected to a pixel in a display area, the second detection TFT being not electrically connected to a pixel in the display area, and the channel width of the second detection TFT being smaller than the channel width of the first detection TFT; a detection pad, the detection pad including a first detection pad block and a second detection pad block, the first detection pad block being electrically connected to a drain electrode of the first detection TFT and a drain electrode of the second detection TFT through a first connection line, and the second detection pad block being electrically connected to a gate electrode of the first detection TFT and a gate electrode of the second detection TFT through a second connection line. Therefore, if static electricity enters the detection TFT because the detection pad is exposed on the surface, since the channel width of the second detection TFT is smaller than the channel width of the first detection TFT, the static electricity can more easily break down the channel of the second detection TFT, causing the second detection TFT to be damaged and fail. In this way, the second detection TFT can be used to protect the first detection TFT, and since the second detection TFT is not electrically connected to the pixels in the display area, damage to the second detection TFT will not affect the pixels in the display area, and thus will not affect the display quality of the display panel.

[0005] According to an embodiment of the present invention, the second detection TFT is arranged on a side of the first detection TFT close to the detection pad.

[0006] According to an embodiment of the present invention, the surface where the source and drain in the second detection TFT are opposite to each other is sawtooth-shaped, and / or the surface where the drain and source in the second detection TFT are opposite to each other is sawtooth-shaped.

[0007] According to an embodiment of the present invention, the display panel includes a plurality of the second detection TFTs, and among the plurality of the second detection TFTs, source electrodes of some of the second detection TFTs are directly connected.

[0008] According to an embodiment of the present invention, the display panel includes a plurality of the second detection TFTs, and the channel widths of the plurality of the second detection TFTs are not completely the same.

[0009] According to an embodiment of the present invention, in a direction approaching the detection pad, the channel widths of the plurality of second detection TFTs gradually decrease.

[0010] According to an embodiment of the present invention, the number of the second detection TFTs is 1 to 4.

[0011] According to an embodiment of the present invention, among the plurality of first detection TFTs, source electrodes in a portion of the first detection TFTs are electrically connected to gate signal lines of pixels in the display area, and source electrodes in another portion of the first detection TFTs are electrically connected to data signal lines of pixels in the display area.

[0012] According to an embodiment of the present invention, the first connection line is disposed at the same layer as the drain electrode, and the second connection line is disposed at the same layer as the gate electrode.

[0013] In another aspect of the present invention, the present invention provides a display device. According to an embodiment of the present invention, the display device includes the display panel described above. Thus, the display device has good display quality. Those skilled in the art can understand that the display device has all the features and advantages of the display panel described above, and no further elaboration is given here. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0015] Figure 1 is a schematic structural diagram of a display panel in one embodiment of the present invention;

[0016] Figure 2 is a schematic structural diagram of a display panel in another embodiment of the present invention;

[0017] Figure 3 It is a schematic structural diagram of a display panel in one embodiment of the present invention. DETAILED DESCRIPTION

[0018] The scheme of the present invention will be explained below in conjunction with embodiments. It will be appreciated by those skilled in the art that the following embodiments are only used to illustrate the present invention and should not be considered as limiting the scope of the present invention. Where specific techniques or conditions are not indicated in the embodiments, the techniques or conditions described in the literature in this area or the product specifications are followed.

[0019] The present invention is described below with reference to specific embodiments. It should be noted that these embodiments are merely illustrative and do not limit the present invention in any way.

[0020] In one aspect of the present invention, the present invention provides a display panel. Figure 1 The display panel includes: a plurality of first detection TFTs (SW) 110 and at least one second detection TFT (SW) 120 located in a non-display area, the first detection TFT 110 is electrically connected to a pixel in a display area 200, the second detection TFT 120 is not electrically connected to a pixel in the display area 200, and a channel width L2 of the second detection TFT 120 is smaller than a channel width L1 of the first detection TFT 110; a detection pad, the detection pad includes a first detection pad block 210 and a second detection pad block 220, the first detection pad block 210 is electrically connected to a drain electrode 112 of the first detection TFT 110 and a drain electrode 122 of the second detection TFT 120 through a first connection line 211210, and the second detection pad block 220 is electrically connected to a gate electrode 111 of the first detection TFT 110 and a gate electrode 121 of the second detection TFT 120 through a second connection line 221. Therefore, if static electricity enters the detection TFT because the detection pad is exposed on the surface, since the channel width of the second detection TFT is smaller than the channel width of the first detection TFT, the static electricity can more easily break down the channel of the second detection TFT, causing the second detection TFT to be damaged and fail. In this way, the second detection TFT can be used to protect the first detection TFT, and since the second detection TFT is not electrically connected to the pixels in the display area, damage to the second detection TFT will not affect the pixels in the display area, and thus will not affect the display quality of the display panel.

[0021] It should be noted that the detection pad is arranged on the detection lighting component (not shown in the figure) to realize the electrical connection between the detection lighting component and the detection TFT (including the first detection TFT and the second detection TFT), and the detection lighting component is used to detect whether the pixels in the display area can be lit normally.

[0022] Among them, the inventor verified through experiments that the smaller the channel width of the detection TFT (including the first detection TFT and the second detection TFT), the easier it is to be broken down by static electricity. For example, in some experiments, the channel width of the detection TFT is 3.0μm, and 2kV static electricity can break it down. When the source-drain voltage difference is 30V, the detection TFT damaged by static electricity begins to fail; when the channel width of the detection TFT is 4.5μm, 3kV static electricity can break through the channel. At this time, when the source-drain voltage difference is 50V, the SW damaged by static electricity begins to fail. Among them, there are no special requirements for the specific values ​​of the channel width of the first detection TFT and the channel width of the second detection TFT. Those skilled in the art can flexibly choose according to actual conditions, as long as the channel width of the second detection TFT is smaller than the channel width of the first detection TFT.

[0023] Among them, those skilled in the art can understand that the non-display area is set around the display area, and multiple first detection TFTs 110 and at least one second detection TFT 120 can be set on one side or multiple sides of the non-display area. Those skilled in the art can flexibly set it according to actual conditions, wherein, if the first detection TFT is located on multiple sides of the non-display area. In addition, multiple first detection TFTs 110 and at least one second detection TFT 120 on the same side of the non-display area are arranged in one or more rows, wherein the second detection TFT can be located in one of the rows or multiple rows.

[0024] Among them, the structures of the first detection TFT and the second detection TFT are basically the same as the structures of the normal TFTs in the display area, and can be manufactured through the same manufacturing steps in the manufacturing process, that is, the first detection TFT 110 also includes structures such as a substrate, a gate 111, a gate insulating layer, an active layer 113, an interlayer dielectric layer, a drain electrode 112 and a source electrode 114, and the second detection TFT 120 also includes structures such as a substrate, a gate 121, a gate insulating layer, an active layer 123, an interlayer dielectric layer, a drain electrode 122 and a source electrode 124, and the insulating layer structures such as the gate insulating layer and the interlayer dielectric layer are not shown in the figure.

[0025] According to an embodiment of the present invention, as described above, the first detection TFT is electrically connected to the pixel of the display area, so that the detection pad can test whether the pixel of the display area can be normally lit through the first detection TFT, wherein, with reference to Figure 1As shown, among the plurality of first detection TFTs 110, the source electrodes 114 in a portion of the first detection TFTs 110 are electrically connected to the gate signal lines 310 of the pixels in the display area 300, and the source electrodes 124 in another portion of the first detection TFTs 110 are electrically connected to the data signal lines 320 of the pixels in the display area 300. Further, the gate signal line in each pixel is electrically connected to the source electrode of a first detection TFT, the data signal line in each pixel is electrically connected to a first detection TFT, and a first detection TFT is electrically connected to only one signal line (gate signal line or data signal line), so that in the entire display panel, the number of sub-pixels in the display area and the number of first detection TFTs are in a 1:2 relationship.

[0026] Among them, the first conductive connection line 311 electrically connecting the source electrode 114 in the first detection TFT 110 and the gate signal line 310 of the pixel in the display area 300 can be a conductive line set in the same layer as the source electrode (obtained by the same etching step), or a conductive line set in the same layer as the gate signal line 310 (obtained by the same etching step), or can be set in the same layer as other conductive layers in the display panel (obtained by the same etching step); similarly, the second conductive connection line 321 electrically connecting the source electrode 124 in the first detection TFT 110 and the data signal line 320 of the pixel in the display area 300 can be a conductive line set in the same layer as the source electrode (obtained by the same etching step), or a conductive line set in the same layer as the data signal line 320 (obtained by the same etching step), or can be set in the same layer as other conductive layers in the display panel (obtained by the same etching step).

[0027] According to an embodiment of the present invention, Figure 1 As shown, the first detection pad block 210 is electrically connected to the drain electrode 112 of the first detection TFT 110 and the drain electrode 122 of the second detection TFT 120 through the first connection line 211. The first connection line 211 can be arranged in the same layer as the drain electrode (including the drain electrode 112 of the first detection TFT 110 and the drain electrode 122 of the second detection TFT 120), and can be manufactured by the same manufacturing process, wherein the first detection pad block 210 can be electrically connected to the first connection line 211 through a pad (not shown in the figure); Figure 1As shown, the second detection pad block 220 is electrically connected to the gate 111 of the first detection TFT 110 and the gate 121 of the second detection TFT 120 through the second connection line 221, wherein the second connection line 221 can be arranged in the same layer as the gate (including the gate 111 of the first detection TFT 110 and the gate 121 of the second detection TFT 120), and can be manufactured by the same manufacturing process, wherein the second detection pad block 220 can be electrically connected to the second connection line 221 through the pad (not shown in the figure). After the display panel is cut, the pad is easily exposed on the surface, and static electricity is easily introduced, causing damage to the detection TFT.

[0028] It should be noted that, in order to better and more comprehensively detect whether the pixel can be normally lit, in addition to the detection pads including the first detection pad block 210 and the second detection pad block 220, the display panel of the present invention may further include one or more detection pad blocks. Those skilled in the art will understand that the first detection pad block 210 and the second detection pad block 220 are arranged in relatively adjacent positions, such as Figure 1 shown.

[0029] According to an embodiment of the present invention, referring to Figure 1 , the second detection TFT 120 is arranged on the side of the first detection TFT 110 close to the detection pad. The inventor experimentally verified that after static electricity is introduced into the detection TFT, the first detection TFT to be damaged is the detection TFT close to the static electricity input terminal, that is, the closer the detection TFT is to the detection pad, the easier it is for the static electricity brought by the detection pad to break down its channel. Therefore, in order to make the channel of the second detection TFT be broken down before the channel of the first detection TFT, the present invention arranges the second detection TFT on the side of the first detection TFT 110 close to the detection pad, so that the first detection TFT can be more effectively protected.

[0030] According to an embodiment of the present invention, referring to Figure 2 , the surface where the source 124 and the drain 122 in the second detection TFT 120 are arranged opposite to each other is sawtooth-shaped, and / or the surface where the drain 122 and the source 124 in the second detection TFT 120 are arranged opposite to each other is sawtooth-shaped, that is, at least one of the two surfaces where the source 124 and the drain 122 in the second detection TFT 120 are arranged opposite to each other is sawtooth-shaped. Thus, the tip discharge characteristic can be utilized to make it easier for static electricity to discharge from the second detection TFT with a sawtooth structure, that is, static electricity can more easily break through the channel of the second detection TFT with a sawtooth structure, thereby better protecting the first detection TFT from being damaged by static electricity. Among them, if the display panel includes multiple second detection TFTs, then the multiple second detection TFTs can be partially or fully provided with a sawtooth structure.

[0031] According to an embodiment of the present invention, the number of the second detection TFTs is 1 to 4 ( Figure 1 to Figure 3 (In the example, two second detection TFTs are included). Thus, the anti-static requirements of the display panel can be effectively met.

[0032] According to an embodiment of the present invention, referring to Figure 3 The display panel includes a plurality of second detection TFTs 120, among which the source electrodes 124 of all or part of the second detection TFTs 120 (at least two second detection TFTs) are directly connected. Thus, when the static electricity introduced by the detection assembly is relatively strong, the relatively strong static electricity can break down the channels of the plurality of second detection TFTs connected in series, thereby increasing the probability of the second detection TFTs whose sources are connected in series being broken down, and thus better protecting the first detection TFT. Figure 3 As shown, the above-mentioned direct connection setting of the source 124 can be directly connected through a conductive connection line 1240 set in the same layer as the source 124. In the manufacturing process, the conductive connection line 1240 can be manufactured through the same step as the source 124.

[0033] According to an embodiment of the present invention, the display panel includes a plurality of second detection TFTs, and the channel widths in the plurality of second detection TFTs are not completely the same. In some embodiments of the present invention, the channel widths in the plurality of second detection TFTs 120 gradually decrease in the direction close to the detection pad. According to the principle of electrostatic breakdown, the closer the metals at both ends are, the easier they are to be broken down. Thus, in the direction away from the detection pad, the static electricity introduced by the detection pad can gradually break down the second detection TFTs at the edge, thereby achieving a progressive anti-static effect.

[0034] In addition, those skilled in the art can understand that the above-mentioned data signal lines, gate signal lines, gate electrodes, sources, active layer first connection lines, second connection lines, etc., which are located in different layers of conductive structures, all have insulating layers, but are not shown in the figure. For example, the gate signal lines 310 and the data signal lines 320 in the display area 300 are arranged in different layers and are separated by an insulating layer, but the insulating layer is not drawn in the figure; for another example, the gate insulating layer between the gate electrode and the active layer in the detection TFT is not drawn, and the interlayer dielectric layer between the active layer and the source and drain is not drawn.

[0035] In another aspect of the present invention, the present invention provides a display device. According to an embodiment of the present invention, the display device includes the display panel described above. Thus, the display device has good display quality. Those skilled in the art can understand that the display device has all the features and advantages of the display panel described above, and no further elaboration is given here.

[0036] According to the embodiments of the present invention, there are no special requirements for the specific type of the display device, and those skilled in the art can flexibly select according to actual conditions. For example, the display device can be any display device with a display function, such as a mobile phone, iPad, notebook, game console, etc.

[0037] Those skilled in the art will understand that, in addition to the above-mentioned display panel, the display device may also have some structures or components necessary for a conventional display device. Taking a mobile phone as an example, it may also include necessary structures and components such as a camera module, an audio module, a back cover, a middle frame and a fingerprint module.

[0038] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0039] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0040] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A display panel, characterized in that: include: A plurality of first detection TFTs and at least one second detection TFT located in a non-display area, wherein the first detection TFTs are electrically connected to pixels in a display area, the second detection TFTs are not electrically connected to pixels in the display area, and a channel width of the second detection TFT is smaller than a channel width of the first detection TFT; A detection pad, wherein the detection pad includes a first detection pad block and a second detection pad block, wherein the first detection pad block is electrically connected to the drain of the first detection TFT and the drain of the second detection TFT through a first connecting line, and the second detection pad block is electrically connected to the gate of the first detection TFT and the gate of the second detection TFT through a second connecting line.

2. The display panel according to claim 1, characterized in that: The second detection TFT is disposed on a side of the first detection TFT close to the detection pad.

3. The display panel according to claim 1, characterized in that: The surface where the source electrode and the drain electrode of the second detection TFT are arranged opposite to each other is in a sawtooth shape, and / or the surface where the drain electrode and the source electrode of the second detection TFT are arranged opposite to each other is in a sawtooth shape.

4. The display panel according to claim 1, characterized in that: A plurality of the second detection TFTs are included, and among the plurality of the second detection TFTs, source electrodes of some of the second detection TFTs are directly connected.

5. The display panel according to claim 2, characterized in that: A plurality of the second detection TFTs are included, and channel widths of the plurality of the second detection TFTs are not completely the same.

6. The display panel according to claim 5, characterized in that: In a direction approaching the detection pad, the channel widths of the plurality of second detection TFTs gradually decrease.

7. The display panel according to any one of claims 1 to 6, characterized in that: The number of the second detection TFTs is 1 to 4.

8. The display panel according to any one of claims 1 to 6, characterized in that: Among the plurality of first detection TFTs, source electrodes in some of the first detection TFTs are electrically connected to gate signal lines of pixels in the display area, and source electrodes in another portion of the first detection TFTs are electrically connected to data signal lines of pixels in the display area.

9. The display panel according to any one of claims 1 to 6, characterized in that: The first connection line is disposed in the same layer as the drain electrode, and the second connection line is disposed in the same layer as the gate electrode.

10. A display device, characterized in that: A display panel comprising any one of claims 1 to 9.

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