CN109345985B

CN109345985B - Display device

Info

Publication number: CN109345985B
Application number: CN201811251054.XA
Authority: CN
Inventors: 王刚; 李威龙; 张露; 韩珍珍; 胡思明
Original assignee: Kunshan Govisionox Optoelectronics Co Ltd
Current assignee: Kunshan Govisionox Optoelectronics Co Ltd
Priority date: 2018-10-25
Filing date: 2018-10-25
Publication date: 2022-03-29
Anticipated expiration: 2038-10-25
Also published as: CN109345985A

Abstract

Disclosed is a display device, including: a substrate having a display region and a non-display region disposed on an outer peripheral side of the display region, the non-display region having a plurality of wiring regions formed therein; a plurality of pixels disposed in a display area of the substrate; a plurality of data lines connected to the plurality of pixels; testing a voltage line; and each wiring area is provided with at least one detection line to detect the crack condition of each wiring area, one end of each detection line is connected with the test voltage line through the switch element, and the other end of each detection line is connected with one data line in the plurality of data lines. According to the display device of the embodiment of the invention, whether cracks exist in the wiring area can be judged according to the light emitting condition of the pixels of the column corresponding to each wiring area. By arranging a plurality of wiring areas in the non-display area, a smaller area of a crack occurrence position can be distinguished, and when a crack occurs, which specific wiring area it occurs in can be accurately judged.

Description

Display device

Technical Field

The invention relates to the field of display, in particular to a display device.

Background

Display devices are widely used in the fields of mobile phones, wearable devices, electronic readers, and the like, and the mainstream Display devices generally include Liquid Crystal Display (LCD) devices and Organic Light-Emitting Diode (OLED) Display devices.

The fabrication of such display devices typically requires multiple processes performed on a common substrate, followed by dicing or peeling to provide individual display devices. In the cutting or stripping process, the display device is constantly ravaged, easily causing screen cracks.

The prior art generally employs a Panel Crack Detection (PCD) circuit to detect screen body cracks.

Disclosure of Invention

In a PCD circuit, generally, one crack detection line is provided around a non-display region of a display device. Therefore, the crack detection scheme of the prior art can only detect the existence of cracks, and cannot judge the positions of the cracks.

The invention provides a display device capable of distinguishing a specific region of a crack occurrence position.

An embodiment of the present invention provides a display device, including: a substrate having a display region and a non-display region disposed on an outer peripheral side of the display region, the non-display region having a plurality of wiring regions formed therein; a plurality of pixels disposed in a display area of the substrate; a plurality of data lines connected to the plurality of pixels; testing a voltage line; and each wiring area is provided with at least one detection line to detect the crack condition of each wiring area, one end of each detection line is connected with the test voltage line through the switch element, and the other end of each detection line is connected with one data line in the plurality of data lines.

According to an aspect of the embodiments of the present invention, the non-display area includes a first area extending in a first direction and a second area extending in a second direction, the first direction crossing the second direction, the first area and the second area each forming a wiring area.

According to an aspect of the embodiment of the invention, the first region is formed with a plurality of wiring regions, and/or the second region is formed with a plurality of wiring regions, and each wiring region is provided with at least one detection line.

According to an aspect of the embodiment of the invention, the second direction is perpendicular to the first direction, and the length of the second region is greater than the length of the first region.

According to an aspect of the embodiments of the invention, the first region has first and second ends opposite to each other in the first direction, the plurality of wiring regions are arranged in order from the first end to the second end of the first region, and the detection lines of a subsequent wiring region in adjacent wiring regions also extend through a previous wiring region.

According to an aspect of the embodiment of the invention, the second region has first and second ends opposite to each other in the second direction, the plurality of wiring regions are arranged in order from the first end to the second end of the second region, and the detection lines of a subsequent wiring region in adjacent wiring regions also extend through a previous wiring region.

According to an aspect of the embodiment of the present invention, the detection lines of the wiring regions in the first region also extend through the wiring regions in the second region, and/or the detection lines of the wiring regions in the second region also extend through the wiring regions in the first region.

According to an aspect of an embodiment of the present invention, at least one of the plurality of sensing lines forms a pattern in the wiring region, the pattern including a periodically extending pattern.

According to one aspect of an embodiment of the invention, the pattern comprises a serpentine pattern.

According to an aspect of an embodiment of the present invention, the switching element is a transistor, the transistor includes a source, a drain, and a gate, the test voltage line is connected to one of the source and the drain of the transistor, one of the plurality of detection lines is connected to the other of the source and the drain of the transistor, and the display device further includes: and a test control line connected to the gate of the transistor.

According to the display device of the embodiment of the invention, the non-display area is formed with a plurality of wiring areas, each wiring area is provided with at least one detection line, each detection line can be connected to the data line corresponding to one column of pixels, and therefore whether cracks exist in the wiring area can be judged according to the light emitting condition of the column of pixels corresponding to each wiring area. The specific area of the crack occurrence position can be distinguished by arranging the plurality of wiring areas in the non-display area, and when a crack occurs, the specific wiring area where the crack occurs can be accurately judged, so that a targeted measure can be provided to reduce the crack occurrence condition in the area.

Drawings

Other features, objects and advantages of the invention will become apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings in which like or similar reference characters refer to the same or similar parts.

Fig. 1 illustrates a schematic view of a region structure of a display device according to an embodiment of the present invention;

fig. 2 illustrates a schematic structural diagram of a display device according to an embodiment of the present invention.

Detailed Description

Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Fig. 1 and fig. 2 respectively show a schematic region structure diagram and a schematic structure diagram of a display device according to an embodiment of the present invention, where the display device of this embodiment may be an OLED display device, or may also include, but is not limited to, other display devices such as an LCD. The display device includes a substrate 110, a plurality of pixels P, a plurality of data lines D1, D2, D3, …, D (i-1), Di, D (i +1), …, D (m-2), D (m-1), Dm, a test voltage line TD, and a plurality of detection lines CD1 to CD 8. Test lines CD1 to CD8 were used to detect screen cracks.

The substrate 110 may be rigid, such as glass, or flexible, such as a polymer substrate, e.g., a Polyimide (PI) film, or a substrate including a polymer material, e.g., PI. The substrate 110 includes a display region 111 and a non-display region 112 disposed at an outer circumferential side of the display region 111. The non-display area 112 has a plurality of wiring regions 120 formed therein.

The pixels P are minimum units for displaying an image, and each pixel P may be, for example, a sub-pixel for displaying any one color of red, green, blue, or the like (or another color of white, cyan, or the like), or may be a pixel unit including a plurality of sub-pixels. A plurality of pixels P are disposed in the display region 111 of the substrate 110. The plurality of pixels P may be arranged in an array within the display region 111, for example, at equal intervals in a row direction or a column direction, thereby forming a plurality of rows or columns. The rows and columns may be horizontal and vertical, parallel to the edges of the substrate 110, or may be other oblique orientations.

The data lines D1 to Dm (m ≧ 2) are connected to the pixels P, and in the present embodiment, the data lines D1 to Dm extend substantially in the column direction and correspond to the pixels P in multiple columns one by one, and each column of pixels P is connected to a corresponding data line.

The display device may further include other known line structures such as a plurality of scan lines and a plurality of power lines, and known devices such as a timing controller, a gate driving device connected to the scan lines, and a source driving device connected to the data lines, which are not shown in the figure.

The test voltage line TD may be disposed in the non-display region 112, but may be disposed outside the substrate 110 in some embodiments.

The detecting lines CD1 to CD8 are illustrated as including 8 lines in this embodiment, but in other embodiments, the number of the detecting lines CD1 to CD8 may be other numbers, and the number may correspond to the number of the wiring regions 120. Each of the wiring areas 120 is provided with at least one sensing line to detect a crack condition of each of the wiring areas 120, and one end of each of the sensing lines is connected to the test voltage line TD through a switching element and the other end is connected to one of the plurality of data lines D1 to Dm.

In the example of the embodiment, the detection line CD1 is connected to the data line D1, the detection line CD5 is connected to the data line D2, the detection line CD4 is connected to the data line D3, the detection line CD3 is connected to the data line D (i-1), the detection line CD6 is connected to the data line D (i +1), the detection line CD7 is connected to the data line D (m-2), the detection line CD8 is connected to the data line D (m-1), and the detection line CD2 is connected to the data line Dm. Other data lines, for example, the data line Di may be connected to the test voltage line TD through the switching element without passing through the sensing line. It is understood that the number and mutual correspondence of the detection lines and the data lines are not limited to the above examples, and may be appropriately corresponding according to the arrangement of the wiring region 120.

In the present embodiment, the detection line and the data line connected thereto may be integrated, and both may be formed at the same time, for example, the detection line CD1 is integrated with the data line D1, that is, both are actually a line, which is drawn out to the non-display area (the wiring area 120) before the data line D1 is connected to the switching element to form the detection line CD1, and the other detection lines and the data line may be arranged similarly. In the case where there are a plurality of data lines D1 through Dm, a part of the data lines (e.g., D1, D2, D3, D (i-1), D (i +1), D (m-2), D (m-1), Dm in the present embodiment) may be pulled to different positions of the non-display area 112, i.e., to different wiring regions 120. The data lines D1 through Dm may be panel test data lines for panel test (cell test), but may also be other data lines. In other embodiments, the sensing lines and the data lines may be formed separately or in different layers, for example, the sensing lines and the data lines are formed of different metal layers and connected by vias.

In the present embodiment, the drawing positions of the data lines D1 to Dm (i.e., the positions drawn from the data lines to form the detection lines) are located in a lower step area of the substrate 110, i.e., a non-display area below the substrate 110. In other embodiments, the drawing positions of the data lines D1-Dm may be located in the non-display region above the substrate 110, or may be located at any position in the middle of the data lines, i.e., between any two pixels P in the display region 111.

In this embodiment, the switching element is a transistor 130, the transistor 130 includes a source, a drain, and a gate, one of the source and the drain of the transistor 130 is connected to the test voltage line TD, and the other of the source and the drain of the transistor 130 is connected to one of the plurality of detection lines CD1 to CD 8. The display device further includes a test control line TG connected to the gates of the transistors 130 so that a potential signal given to the gates of the plurality of transistors 130 by the test control line TG can control on and off between the test voltage line TD and the plurality of detection lines CD1 to CD 8.

During the sensing, the test control line TG supplies a predetermined potential signal to the gate of the transistor 130, so that the test voltage line TD is turned on from the plurality of sensing lines CD1 to CD 8. When the test voltage line TD provides a predetermined display signal and the transistor 130 is turned on, the column pixels P connected to each of the plurality of data lines D1 to Dm provide a predetermined display signal according to the test voltage line TD for normal display. When a defect such as a crack occurs in the non-display area 112 such that at least one of the detection lines CD1 to CD8 is broken or the resistance value is changed, the column pixel P to which the data line corresponding to the detection line is connected displays an abnormality. According to the display condition of the pixels P in the corresponding column of each data line, whether a defect occurs in the non-display area 112 can be determined in time. In the present embodiment, the panel crack detection is performed together with the panel test at the panel test (cell test) stage, and thus there is a possibility that a defect occurs in the display region 111 to cause a display abnormality. However, the display abnormality due to a defect such as a crack in the non-display region 112 is generally a display abnormality of an entire column of pixels P, while the display abnormality due to a defect in the display region 111 may be a pixel abnormality of a part of the pixels P, and thus, actually, the two can be distinguished in many cases.

The number of the test voltage lines TD may be one or more than two, the number of the test control lines TG may be one or more than two, and the plurality of data lines D1 to Dm may respectively correspond to the plurality of test voltage lines TD and/or the plurality of test control lines TG in a dispersed manner, thereby improving the detection efficiency.

According to the display device of the embodiment of the invention, the non-display area 112 is formed with a plurality of wiring areas 120, each wiring area 120 is provided with at least one detection line, each detection line can be connected to the data line corresponding to a column of pixels P, so that whether cracks exist in the wiring area 120 can be judged according to the light emitting condition of the column of pixels P corresponding to each wiring area 120. By arranging a plurality of wiring regions 120 in the non-display area 112, it is possible to distinguish a specific area where a crack occurs, and when a crack occurs, it is possible to accurately determine which specific wiring region 120 it occurs in.

In the present embodiment, the non-display area 112 includes a first area 112a extending in a first direction and a second area 112b extending in a second direction, the first direction and the second direction intersect, and the first area 112a and the second area 112b each form the wiring area 120. The first direction may be a horizontal direction and the second direction may be a vertical direction, which are perpendicular to each other. In the case of other shapes where the panel is non-rectangular, the first and second directions may also be other directions that intersect along the edge of the panel, for example two directions that extend in different directions from a point at the edge of the panel, which may be non-linear, for example, arcuate.

The substrate 110 of the present embodiment has a rectangular shape, and the non-display region 112 may include two first regions 112a and two second regions 112 b. The second direction is perpendicular to the first direction, that is, the length directions of the second region 112b and the first region 112a are perpendicular to each other, wherein the length of the second region 112b is greater than the length of the first region 112 a.

In the example of the present embodiment, each of the second regions 112b is formed with a plurality of wiring regions 120, and each of the wiring regions 120 is provided with at least one detection line. In some other embodiments, the first region 112a may also be formed with a plurality of wiring regions 120, and each wiring region 120 is provided with at least one detecting line.

Specifically, the two first regions 112a of the substrate 110 of the embodiment are the upper first region 112a and the lower first region 112a, and the two second regions 112b are the left second region 112b and the right second region 112 b.

The upper first region 112a and the lower first region 112a each form 1 wiring region 120, wherein the detection line CD1 is disposed in the wiring region 120 of the upper first region 112a, and the detection line CD2 is disposed in the wiring region 120 of the lower first region 112 a.

The left second region 112b forms 3 wiring regions 120, and the detection lines CD3, CD4, CD5 are respectively disposed in the 3 wiring regions 120 of the left second region 112 b. The right second area 112b also forms 3 wiring areas 120, and the detection lines CD6, CD7, CD8 are respectively disposed in the 3 wiring areas of the right second area 112 b.

In the present embodiment, each of the second regions 112b has first and second ends opposite to each other in the second direction, the plurality of wiring regions 120 are arranged in sequence from the first end to the second end of the second region 112b, and the detection lines of a subsequent wiring region 120 in an adjacent wiring region 120 also extend through a previous wiring region 120.

Taking the left second region 112b as an example, the first end is the lower end, the second end is the upper end, the 3 wiring regions 120 include a left bottom wiring region 120, a left middle wiring region 120, and a left top wiring region 120, and are sequentially arranged from the lower end to the upper end of the second region 112b, wherein the detection lines CD3, CD4, CD5 are respectively disposed in the left bottom wiring region 120, the left middle wiring region 120, and the left top wiring region 120 sequentially arranged from the lower end to the upper end. The detection line CD4 further extends through the left bottom wiring area 120 corresponding to the detection line CD3, and the detection line CD5 further extends through the left bottom wiring area 120 corresponding to the detection line CD3 and the left middle wiring area 120 corresponding to the detection line CD 4.

Further, in the present embodiment, the detection lines of the wiring regions 120 in the first region 112a also extend through the wiring regions 120 in the second region 112 b. For example, the detection line CD1 of the wiring region 120 of the upper first region 112a of the present embodiment also extends through 3 wiring regions 120 in the left second region 112 b.

According to the display device of the embodiment of the present invention described above, if a crack defect occurs in the upper first region 112a, a display abnormality occurs in the pixel P corresponding to the data line D1 connected to the detection line CD 1; if the crack defect occurs in the upper left wiring area 120, the display abnormality occurs in the pixel P corresponding to the data line D1 connected to the detection line CD1 and the pixel P corresponding to the data line D2 connected to the detection line CD 5; if the crack defect occurs in the left middle wiring area 120, a display abnormality occurs in the pixel P corresponding to the data line D1 connected to the detection line CD1, the pixel P corresponding to the data line D2 connected to the detection line CD5, and the pixel P corresponding to the data line D3 connected to the detection line CD 4; if the crack defect occurs in the left bottom wiring region 120, a display abnormality occurs in the pixel P corresponding to the data line D1 connected to the detection line CD1, the pixel P corresponding to the data line D2 connected to the detection line CD5, the pixel P corresponding to the data line D3 connected to the detection line CD4, and the pixel P corresponding to the data line D (i-1) connected to the detection line CD 3.

The detection principle of the wiring regions 120 in the lower first region 112a and the right second region 112b is substantially the same as that of the upper first region 112a and the left second region 112b, and the details thereof are not described herein.

From the abnormal display condition of the corresponding pixel P of the data line, it can be specifically distinguished which wiring region 120 has a crack defect. Whether cracks appear on the display device can be judged, and the specific positions of the cracks can also be judged, so that the causes of the cracks can be investigated in a targeted manner, and the method has contribution to product analysis.

It should be noted that, in the above example, each of the second regions 112b is formed with a plurality of wiring regions 120, and in some other embodiments, the first region 112a may also be formed with a plurality of wiring regions 120. Further, the first region 112a has a first end and a second end opposite to each other in the first direction, the plurality of wiring regions 120 are sequentially arranged from the first end to the second end of the first region 112a, and the detection lines of a next wiring region 120 in adjacent wiring regions 120 also extend through a previous wiring region 120.

In some other embodiments, the detection lines of the wiring regions 120 in the second region 112b may also extend through the wiring regions 120 in the first region 112 a.

According to the display device of the embodiment of the invention, at least one detection line of the plurality of detection lines CD1 to CD8 forms a pattern including a periodically extending pattern in the wiring region 120. In this embodiment, the pattern includes a serpentine pattern to fill the corresponding routing region 120.

The detection process of the embodiment of the invention can be simultaneously carried out in the panel Test (Cell Test) process, so that the cracks can be found as soon as possible, and the waste of subsequent process resources is avoided.

In accordance with the above-described embodiments of the present invention, these embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A display device, comprising:

a substrate having a display region and a non-display region disposed on an outer peripheral side of the display region, the non-display region having a plurality of wiring regions formed therein, the non-display region including a first region extending in a first direction and a second region extending in a second direction, the first direction crossing the second direction, the first region and the second region each forming the wiring region;

a plurality of pixels disposed in a display area of the substrate;

a plurality of data lines connected to the plurality of pixels;

testing a voltage line; and

a plurality of sensing lines, each of the wiring areas being provided with at least one sensing line to detect a crack condition of each of the wiring areas, one end of each of the sensing lines being connected to the test voltage line through a switching element, the other end being connected to one of the plurality of data lines, the second area having opposite first and second ends in the second direction, the plurality of wiring areas being arranged in order from the first to the second end of the second area, the sensing line adjacent to a latter one of the wiring areas further extending through the former one of the wiring areas.

2. The display device according to claim 1, wherein the first region is formed with a plurality of the wiring regions, and/or wherein the second region is formed with a plurality of the wiring regions, and wherein

Each wiring area is provided with at least one detection line.

3. A display device as claimed in claim 1 or 2, wherein the second direction is perpendicular to the first direction, and the length of the second region is greater than the length of the first region.

4. The display device according to claim 3, wherein the first region has first and second ends opposite to each other in the first direction, a plurality of the wiring regions are arranged in order from the first end to the second end of the first region, and the detection lines of a subsequent wiring region in adjacent wiring regions also extend through a previous wiring region.

5. The display device according to claim 1 or 2, wherein the detection lines of the wiring regions in the first region also extend through the wiring regions in the second region, and/or wherein the detection lines of the wiring regions in the second region also extend through the wiring regions in the first region.

6. The display device of claim 1, wherein at least one of the plurality of inspection lines forms a pattern within a wiring area, the pattern comprising a periodically extending pattern.

7. The display device of claim 6, wherein the pattern comprises a serpentine pattern.

8. The display device according to claim 1, wherein the switching element is a transistor including a source, a drain, and a gate, wherein the test voltage line is connected to one of the source and the drain of the transistor, wherein one of the plurality of detection lines is connected to the other of the source and the drain of the transistor,

the display device further includes:

and the test control line is connected to the grid electrode of the transistor.