CN115268152A

CN115268152A - Display panel and electronic equipment

Info

Publication number: CN115268152A
Application number: CN202210706453.0A
Authority: CN
Inventors: 林琳琳; 胡波; 方鑫; 谢鑫; 刘耀; 林剑涛; 陶文昌
Original assignee: BOE Technology Group Co Ltd; Fuzhou BOE Optoelectronics Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Fuzhou BOE Optoelectronics Technology Co Ltd
Priority date: 2022-06-21
Filing date: 2022-06-21
Publication date: 2022-11-01

Abstract

The embodiment of the present disclosure provides a display panel and an electronic device, the display panel including: the liquid crystal box detection areas comprise a plurality of test pad areas; the test pad area includes at least: a conductive layer and a metal layer; the conducting layer is positioned on the top layer of the test pad area and used for receiving a test voltage; the metal layer is arranged in the coverage range of the conductive layer and is arranged according to a preset pattern, the coverage area of the metal layer is smaller than that of the conductive layer, so that an area which is not covered by the metal layer exists in the test pad area, and the preset pattern is used for controlling the deviation corresponding to the deflection of the liquid crystal in a preset range. According to the liquid crystal box detection area adjusting method and device, each test pad area of the liquid crystal box detection area is adjusted, the coverage area of the metal layer in the test pad area is reduced, and the metal layer is arranged according to the preset pattern, so that the section difference in the whole liquid crystal box detection area is reduced, the yield and the delivery rate are increased, and the degradation rate and the rejection rate are reduced.

Description

Display panel and electronic equipment

Technical Field

The present disclosure relates to the field of display, and in particular, to a display panel and an electronic device.

Background

The alignment technology is to use a physical or chemical method to make the alignment film have the ability to align the liquid crystal molecules in the same direction with a certain pretilt angle, i.e. to make the alignment film form an anisotropic alignment to the liquid crystal molecules. According to different liquid crystal display modes or different selected PI liquid molecular structures, two common liquid crystal molecular orientation technologies are a rubbing orientation technology and a photo-orientation technology.

There are physical and chemical methods for aligning liquid crystal molecules. The rubbing orientation belongs to a physical method, which utilizes a rubbing cloth which is specially processed outside a roller to rub and rub grooves with certain depth and directionality on the surface of an orientation layer, and realizes the orientation of liquid crystal molecules according to a PI film and the anchoring force of the PI film on the liquid crystal molecules.

The rubbing orientation process is a process of mechanically contacting and rubbing the surface of a horizontally transferred glass substrate by using a high-speed rotating roller coated with a layer of specially processed rubbing cloth on the outer surface to scratch a directional groove on the surface of a PI film on the substrate.

The defects caused by the rubbing process are mainly poor in orientation uniformity. If the level difference is too large, local friction failure occurs in the vicinity of the level difference. Therefore, in designing the rubbing process, it is necessary to pay special attention to all the pattern wiring in the rubbing direction and avoid the defects due to the step as much as possible.

The liquid crystal box detection (Cell Test) is to perform human-computer combination Test of electrically driving the liquid crystal display screen on line by Barecell and perform grade judgment according to a judgment standard in an automatic or manual detection mode. The short-circuit loop test mode is one of the commonly used liquid crystal cell tests to apply an electrical signal. The conventional method divides data signal or scan signal lines into several groups, and connects them to the periphery of the Bonding area (Bonding area) and leads out a Test Pad (Cell Test Pad) by using short-circuiting rings, respectively. During testing, the electric signal applies a driving signal to the liquid crystal screen through the test Pad area to light up. The test fixture of the test mode is simple and easy, and the test fixtures of different product models can be shared, thereby reducing the operation cost. After the test is finished, the short circuit loop line in the bonding area needs to be melted and removed by laser. Due to the limitation of the accuracy of the CT needle, the CT Pad needs to use a larger area to meet the needle insertion detection requirement. Due to the requirements for different signals, a plurality of test pads need to be set.

Because the difference of the existing CT Pad area sections is large (namely, the height difference is large due to different levels of CT Pad wiring coating layers), a series of bad problems such as L0 vertical black lines, V-Block phenomena, vertical lines Mura (uneven) and the like caused by CT Pad interference often occur in various products during testing, the yield and the delivery rate are reduced, the degradation rate and the rejection rate are increased, and the resource waste of the display panel is caused.

Disclosure of Invention

In view of this, the embodiments of the present disclosure provide a display panel and an electronic device, so as to solve the following problems in the prior art: the problems of L0 vertical black lines, V-Block phenomena, vertical lines Mura (uneven) and the like caused by CT Pad interference reduce the yield and the delivery rate, increase the degradation rate and the rejection rate, and cause the resource waste of the display panel.

In one aspect, an embodiment of the present disclosure provides a display panel, including: a plurality of liquid crystal cell detection areas, the liquid crystal cell detection areas including a plurality of test pad areas; the test pad area includes at least: a conductive layer and a metal layer; the conducting layer is positioned on the top layer of the test pad area and used for receiving a test voltage; the metal layer is arranged in the coverage range of the conductive layer, the metal layer is arranged according to a preset pattern, the coverage area of the metal layer is smaller than that of the conductive layer, so that an area which is not covered by the metal layer exists in the test pad area, and the preset pattern is used for controlling the deviation corresponding to the deflection of the liquid crystal in a preset range.

In some embodiments, the metal layer is disposed on a glass substrate, an insulating layer is disposed between the metal layer and the conductive layer, and the metal layer and the conductive layer are connected by a via.

In some embodiments, the predetermined pattern comprises at least one of: the corresponding patterns are arranged in the transverse direction or the longitudinal direction according to preset intervals in a concave shape, a convex shape, a square shape, a straight shape and a plurality of straight shapes.

In some embodiments, when the predetermined pattern is a plurality of lines, and corresponding patterns are arranged in the transverse direction or the longitudinal direction at predetermined intervals, the via holes arranged on each line are arranged according to a predetermined rule.

In some embodiments, the metal layer is a gate layer and the conductive layer is a pixel electrode layer.

In some embodiments, the test pad region is connected to a predetermined signal line through a metal lead of a same layer as the metal layer.

In some embodiments, the predetermined signal line includes: data signal lines, scanning signal lines.

In some embodiments, further comprising: and the flip chip thin film area is arranged adjacent to the liquid crystal box detection area.

In some embodiments, further comprising: and the display area is arranged outside the flip chip thin film area and the liquid crystal box detection area.

In another aspect, an embodiment of the present disclosure provides an electronic device, including: the display panel according to any one of the embodiments of the present disclosure.

According to the liquid crystal box detection area adjusting method and device, each test pad area of the liquid crystal box detection area is adjusted, the coverage area of the metal layer in the test pad area is reduced, the metal layer is arranged according to the preset pattern, the section difference in the whole liquid crystal box detection area is reduced, the deviation corresponding to liquid crystal deflection is controlled within the preset range, although the deviation still exists, under the condition that the deviation values are consistent, the problems of L0 vertical black lines, V-Block phenomena, vertical line Mura and the like can be improved, the yield and the delivery rate are increased, and the degradation rate and the rejection rate are reduced.

Drawings

In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments described in the present disclosure, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram illustrating the distribution of regions in a display panel according to the prior art;

FIG. 2 is a schematic diagram of a design structure of a CT Pad test area provided in the prior art;

FIG. 3 is a schematic diagram of a wiring structure of a CT Pad provided in the prior art;

FIG. 4 is a schematic diagram illustrating a structure of a liquid crystal cell detection region in a display panel according to an embodiment of the disclosure;

FIG. 5 is a schematic diagram of a partial cross-sectional structure provided by an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of a test pad area with a predetermined pattern in the shape of a Chinese character 'ao' provided by an embodiment of the present disclosure;

fig. 7 is a schematic structural diagram of a test pad region having a predetermined pattern in a vertical line shape according to an embodiment of the present disclosure.

Reference numerals are as follows:

1-liquid crystal box detection area, 2-test pad area, 3-conducting layer, 4-metal layer, 5-via hole, 6-metal lead and 7-insulating layer.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings of the embodiments of the present disclosure. It is to be understood that the described embodiments are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the disclosure without any inventive step, are within the scope of protection of the disclosure.

Unless otherwise defined, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather is used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

To maintain the following description of the embodiments of the present disclosure clear and concise, a detailed description of known functions and known components is omitted from the present disclosure.

As shown in fig. 1, the CT Pad testing area (hereinafter, the liquid crystal cell detecting area) is located between two adjacent COFs (chip on films), and therefore, the CT Pad testing area is inevitably located in the Rubbing direction corresponding to the AA area (display area), and the CT Pad testing area cannot be moved to the Rubbing direction corresponding to the non-AA area. Therefore, the embodiments of the present disclosure aim to provide a method for solving the problem of large step difference of a CT Pad test region.

The design of the conventional CT Pad test area is shown in fig. 2 (the area of the metal layer is larger as the area of the conductive layer, and thus the area of the metal layer is larger as indicated by the diagonal line area), in which the wiring structure of each CT Pad (hereinafter, the test Pad area) is schematically shown in fig. 3 (the square area in the figure is a via hole for inserting a CT pin); in the figure, each CT Pad only comprises two layers of wiring, however, each CT Pad is four layers of wiring, and the four layers also comprise a metal layer with a thicker thickness, so that the difference between the CT Pad and two peripheral regions is larger, the influence (damage) on rubber cloth on a roller is different, when the rubber cloth rubs a PI film in a display area, the directionality of a surface groove after the PI film is rubbed is different, the difference exists between the PI film and the anchoring effect in the region, and when voltage is applied, the deflection angle of liquid crystal molecules is different, the difference exists in transmittance, so that blocks or Mura with alternate brightness and darkness is formed.

If the influence of each region segment difference on the rubber cloth is adjusted to be equivalent, the anchoring force to the liquid crystal after the friction orientation of the PI film is equivalent, further the deflection angles of liquid crystal molecules are equivalent, the light transmittance is equivalent, the brightness difference is reduced correspondingly, and the difference is not easy to be seen by the display panel.

Based on the above considerations, the disclosed embodiments improve the design of the CT Pad test region.

The embodiment of the present disclosure provides a display panel, wherein a structural schematic of a liquid crystal cell detection region is shown in fig. 4, and the display panel includes:

a plurality of liquid crystal cell detection areas 1, each liquid crystal cell detection area including a plurality of test pad areas 2; the test pad area includes: a conductive layer 3 and a metal layer 4 (indicated by oblique lines since the lower layer is covered with the conductive layer); the conducting layer is positioned on the top layer of the test pad area and used for receiving a test voltage; the metal layer is arranged in the coverage range of the conductive layer, the metal layer is arranged according to a preset pattern, the coverage area of the metal layer is smaller than that of the conductive layer, so that an area which is not covered by the metal layer exists in the test pad area, and the preset pattern is used for controlling the deviation corresponding to the liquid crystal deflection in a preset range.

The test pad area is connected to a preset signal line, such as a data signal line and a scanning signal line, through a metal lead 6 on the same layer as the metal layer, and further can transmit voltage to the metal layer through the conducting layer after receiving test voltage from a CT needle, and further supply the voltage to different test lines, so that the defects of the display panel are detected in advance, the screen of the grade-judging NG is scrapped, and the NG screen is prevented from flowing to the rear section of the module, and waste of materials is avoided. The metal lead wire and the metal layer are in the same layer, so the metal lead wire and the metal layer are made of the same material.

The metal layer is arranged on the glass substrate, the insulating layer is arranged between the metal layer and the conducting layer, and the metal layer is connected with the conducting layer through the through hole 5. Fig. 5 is a schematic partial cross-sectional view, in which the metal layer 4 is a gate layer, the conductive layer 3 is a pixel electrode layer, such as Indium Tin Oxide (ITO), the insulating layer 7 may have one or more layers according to different processes, and the two insulating layers in the figure have different film qualities due to different film formation rates and powers, and the film thicknesses may also be different, which is only an example and not limited herein; the size, number and position of the via holes are also only one indication, as long as the on-resistance requirement is met.

The predetermined pattern of the metal layer shown in fig. 4 is a zigzag pattern as an example, and the predetermined pattern may be any pattern having a metal coverage area smaller than that of the conductive layer, such as a zigzag pattern, a square pattern, a zigzag pattern, a line pattern, or a pattern in which a plurality of lines are arranged at predetermined intervals in the horizontal or vertical direction, and the like, and the predetermined pattern may be a concave pattern as shown in fig. 6, as long as the difference in level between the layers of the film can be reduced and the deviation corresponding to the liquid crystal deflection can be controlled within a predetermined range as much as possible, and of course, the more regular the pattern, the more uniform the deviation corresponding to the liquid crystal deflection.

When the predetermined pattern is a plurality of patterns arranged in a horizontal or longitudinal direction at predetermined intervals, for example, the predetermined pattern shown in fig. 7, the via holes arranged in each line are arranged according to a predetermined rule, so that the pattern is more regular, and the uniformity of the deviation corresponding to the liquid crystal deflection is favorably realized. For example, if the predetermined range of the deviation corresponding to the liquid crystal deflection is 3 degrees to 5 degrees, after the pattern is more regular, the deviation can be controlled to be a certain value of 3 degrees, 4 degrees or 5 degrees, and certainly, the value is more extreme, so long as the problems of L0 vertical black lines, V-Block phenomena, vertical lines Mura and the like can be avoided on the display panel, and the display panel still has no problem when the display panel is seen by floating up and down by zero degrees at a certain deviation degree.

The display panel of the embodiment of the disclosure further comprises a display area arranged outside the crystal cover film area and the liquid crystal box detection area, and a crystal cover film area arranged adjacent to the liquid crystal box detection area, wherein the liquid crystal box detection area is arranged between the adjacent crystal cover film areas, and the number of the test pad areas included in each liquid crystal box detection area 1 can be different according to different positions of the liquid crystal box detection areas.

The embodiment of the present disclosure further provides an electronic device, which includes the display panel in the above embodiment of the present disclosure, and the display panel includes:

a plurality of liquid crystal cell detection areas 1, each liquid crystal cell detection area including a plurality of test pad areas 2; the test pad area includes: a conductive layer 3 and a metal layer 4; the conducting layer is positioned on the top layer of the test pad area and used for receiving a test voltage; the metal layer is arranged in the coverage range of the conductive layer and is arranged according to a preset pattern, the coverage area of the metal layer is smaller than that of the conductive layer, so that an area which is not covered by the metal layer exists in the test pad area, and the preset pattern is used for controlling the deviation corresponding to the deflection of the liquid crystal in a preset range.

The test pad region is connected to a predetermined signal line, such as a data signal line, a scan signal line, etc., through a metal lead 6 on the same layer as the metal layer, and thus, after receiving a test voltage from the CT pin, the test pad region can transmit the voltage to the metal layer through the conductive layer, and then supply the voltage to a different test line, thereby detecting whether the display panel is a flawless display panel. The metal lead wire and the metal layer are in the same layer, so the metal lead wire and the metal layer are made of the same material.

The metal layer is arranged on the glass substrate, the insulating layer is arranged between the metal layer and the conducting layer, and the metal layer is connected with the conducting layer through the through hole 5. The metal layer 4 is a gate layer, the conductive layer 3 is a pixel electrode layer, such as Indium Tin Oxide (ITO), and the insulating layer may have one or more layers according to different processes, which is not limited herein; the size and number of the vias are only one indication, as long as the on-resistance requirement is satisfied.

The predetermined pattern may be any pattern having a metal coverage area smaller than that of the conductive layer, such as a convex pattern, a square pattern, a rectangular pattern, or a pattern in which a plurality of lines are arranged at predetermined intervals in the horizontal or longitudinal direction, as long as it is possible to ensure that the deviation corresponding to the liquid crystal deflection is controlled within a predetermined range, and of course, the more regular the pattern, the more uniform the deviation corresponding to the liquid crystal deflection.

When the preset pattern is formed by arranging corresponding patterns in a horizontal or longitudinal direction according to a preset interval in a plurality of lines, the through holes arranged in each line are arranged according to a preset rule, so that the pattern is more regular, and the uniformity of deviation corresponding to liquid crystal deflection is favorably realized. For example, the predetermined range of the deviation corresponding to the liquid crystal deflection is 3 degrees to 5 degrees, after the pattern is more regular, the deviation can be controlled to be a certain value of 3 degrees, 4 degrees or 5 degrees, of course, the value is extremely extreme, and the display panel can really realize the state that the display panel can still have no problem as long as the problems of L0 vertical black lines, V-Block phenomena, vertical lines Mura and the like can be avoided, and the display panel can float up and down to zero a few degrees at a certain deviation degree.

The display panel of the embodiment of the disclosure further comprises a display area arranged outside the crystal cell detection area and the crystal cell detection area, and a crystal cell detection area arranged adjacent to the crystal cell detection area 1, wherein the crystal cell detection area is arranged between the adjacent crystal cell detection areas, and the number of the test pad areas included in each crystal cell detection area can be different according to different positions of the crystal cell detection areas.

For the display panel, the display region may further include a display pixel layer, a driving circuit layer, and the like, the display pixel layer includes a pixel defining layer, the driving circuit layer is configured to set the display pixel layer, the driving circuit layer may include a gate, a source, a drain, a data signal line, a scanning signal line, and the like, and a specific display panel structure may be set according to actual requirements, which is not repeated herein.

Moreover, although exemplary embodiments have been described herein, the scope thereof includes any and all embodiments based on the disclosure with equivalent elements, modifications, omissions, combinations (e.g., of various embodiments across), adaptations or alterations. The elements of the claims are to be interpreted broadly based on the language employed in the claims and not limited to examples described in the present specification or during the prosecution of the application, which examples are to be construed as non-exclusive. It is intended, therefore, that the specification and examples be considered as exemplary only, with a true scope and spirit being indicated by the following claims and their full scope of equivalents.

The above description is intended to be illustrative and not restrictive. For example, the above-described examples (or one or more versions thereof) may be used in combination with each other. For example, other embodiments may be used by those of ordinary skill in the art upon reading the above description. In addition, in the foregoing detailed description, various features may be grouped together to streamline the disclosure. This should not be interpreted as an intention that a disclosed feature not claimed is essential to any claim. Rather, the subject matter of the present disclosure may lie in less than all features of a particular disclosed embodiment. Thus, the following claims are hereby incorporated into the detailed description as examples or embodiments, with each claim standing on its own as a separate embodiment, and it is contemplated that these embodiments may be combined with each other in various combinations or permutations. The scope of the disclosure should be determined with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled.

While the present disclosure has been described in detail with reference to the embodiments, the present disclosure is not limited to the specific embodiments, and those skilled in the art can make various modifications and alterations based on the concept of the present disclosure, and the modifications and alterations should fall within the scope of the present disclosure as claimed.

Claims

1. A display panel, comprising:

a plurality of liquid crystal cell detection areas, the liquid crystal cell detection areas including a plurality of test pad areas;

the test pad area includes at least: a conductive layer and a metal layer;

the conducting layer is positioned on the top layer of the test pad area and used for receiving a test voltage;

the metal layer is arranged in the coverage range of the conductive layer, the metal layer is arranged according to a preset pattern, the coverage area of the metal layer is smaller than that of the conductive layer, so that an area which is not covered by the metal layer exists in the test pad area, and the preset pattern is used for controlling the deviation corresponding to the deflection of the liquid crystal in a preset range.

2. The display panel of claim 1,

the metal layer is arranged on the glass substrate, an insulating layer is arranged between the metal layer and the conducting layer, and the metal layer is connected with the conducting layer through a through hole.

3. The display panel of claim 1,

the predetermined pattern includes at least one of: the corresponding patterns are arranged in a horizontal direction or a longitudinal direction at preset intervals in a concave shape, a convex shape, a square shape, a straight shape and a plurality of straight shapes.

4. The display panel according to claim 3, wherein when the predetermined pattern is a plurality of lines in which corresponding patterns are arranged in a horizontal or vertical direction at predetermined intervals, the via holes provided in each of the lines are arranged in a predetermined rule.

5. The display panel according to claim 1, wherein the metal layer is a gate layer, and the conductive layer is a pixel electrode layer.

6. The display panel according to claim 1, wherein the test pad area is connected to a predetermined signal line through a metal lead line of a same layer as the metal layer.

7. The display panel according to claim 6, wherein the predetermined signal line includes: data signal lines, and scanning signal lines.

8. The display panel according to any one of claims 1 to 7, further comprising: and the flip chip thin film area is arranged adjacent to the liquid crystal box detection area.

9. The display panel according to claim 8, further comprising: and the display area is arranged outside the flip chip thin film area and the liquid crystal box detection area.

10. An electronic device, comprising: the display panel of any one of claims 1 to 9.