CN214043666U - Display substrate and display device - Google Patents

Abstract

The present disclosure provides a display substrate and a display device, the display substrate includes: the rigid carrier plate comprises a hollow area; a flexible substrate on the rigid carrier, the flexible substrate including a first region and a second region; and the shielding layer is positioned on the rigid carrier plate and comprises an opening area and a shielding area; wherein, the orthographic projection of the figures of the hollowed-out area, the opening area and the first area on the rigid carrier plate is completely superposed. The display substrate and the display device provided by the embodiment of the disclosure can realize patterned laser lift-off, the patterning shape is not limited, the laser lift-off patterning precision is improved, and the cost is reduced.

Description

Display substrate and display device

Technical Field

The utility model relates to a show technical field, especially relate to a display substrate and display device.

Background

When a flexible display product is displayed in certain special forms such as bending and curved surface display, the bending form of fixed curvature is required to be realized in a partial area of the product. For flexible display products, the binding wire portion usually occupies a large space, and in order to achieve narrow border and no border of the display products, the binding wire portion is usually bent to the back side to achieve ultra-narrow border display.

In the related art, a technique of decomposing a surface of the flexible substrate in contact with the rigid carrier by using Laser energy to separate the rigid carrier from the flexible substrate is called Laser-Lift-Off (Laser-Lift-Off), and a Laser in an ultraviolet band is commonly used. The display substrate is subjected to regional laser stripping, the carrier plate glass in the corresponding region is removed, and the reserved part is the bendable flexible substrate. However, the conventional laser lift-off equipment can only realize lift-off of a rectangular patterned area and cannot realize lift-off of a circular or other irregular shapes, if any patterning of the laser lift-off area is to be realized, the lift-off can be realized only by adding an additional mask, and one mask can only correspond to one pattern; meanwhile, laser scanning alignment is required in the laser stripping process, the precision of laser stripping equipment is poor, the technological boundary of a laser scanning part is large and often has millimeter magnitude, high-precision patterning stripping cannot be realized, and the method is limited in practical application.

SUMMERY OF THE UTILITY MODEL

The embodiment of the disclosure provides a display substrate and a display device, which can realize laser lift-off patterning, the patterning shape is not limited, the laser lift-off patterning precision is improved, and the cost is reduced.

The technical scheme provided by the embodiment of the disclosure is as follows:

a display substrate, comprising:

the rigid carrier plate comprises a hollow area;

a flexible substrate on the rigid carrier, the flexible substrate including a first region and a second region;

and the shielding layer is positioned on the rigid carrier plate and comprises an opening area and a shielding area;

wherein the orthographic projections of the figures of the hollowed-out area, the opening area and the first area on the rigid carrier plate are completely overlapped.

Illustratively, the shielding layer is provided with a groove structure, and the groove structure is the opening area.

Illustratively, the rigid carrier includes a first surface and a second surface opposite to each other, the flexible substrate is located on the first surface, and the shielding layer is located on the second surface;

and/or the rigid carrier plate comprises a first surface and a second surface which are arranged oppositely, the flexible substrate is positioned on the first surface, and the shielding layer is positioned between the flexible substrate and the first surface.

Illustratively, the orthographic projection shapes of the figures of the hollow area, the opening area and the first area in the direction perpendicular to the first surface of the rigid carrier plate are regular figures or irregular figures, the regular figures comprise at least one of rectangles, circles, triangles, trapezoids and rhombuses, and the irregular figures comprise special-shaped figures except the regular figures.

Exemplarily, the shielding layer comprises an organic coating coated on the rigid carrier plate; and/or the shielding layer comprises an ink-jet printing layer which is printed on the rigid carrier plate in an ink-jet mode.

Illustratively, the substrate further comprises: the display unit is positioned on one side, far away from the rigid carrier plate, of the flexible substrate and comprises a driving circuit layer and a display layer, and the display unit is arranged in the first area and/or the second area.

Illustratively, the first region is located in a middle region of the display substrate, the second region is located in an edge region of the display substrate, and the flexible substrate is bent in the first region.

Illustratively, the first region is located at an edge region of the display substrate, the second region is located at a middle region of the display substrate, and the flexible substrate is bent at the first region.

A display device comprising a display substrate as described above.

Illustratively, the first region is located at an edge region of the display substrate, the second region is located at a middle region of the display substrate, and the flexible substrate is bent at the first region; the display device comprises a plurality of display substrates spliced together.

The beneficial effects brought by the embodiment of the disclosure are as follows:

according to the display substrate and the display device provided by the embodiment of the disclosure, the shielding layer is added on the rigid carrier plate, the opening area of the shielding layer is overlapped with the pattern of the first area on the flexible substrate, the shielding area of the shielding layer is overlapped with the pattern of the second area on the flexible substrate, and the shielding layer can be used as a mask plate in the laser stripping process, so that on one hand, the patterns of the second area and the first area are determined by the patterns of the shielding area and the opening area of the shielding layer, therefore, the pattern of the first area can not be limited to forming a rectangular pattern, and can also realize the regionalization laser stripping of regular patterns or irregular patterns such as a circle, and a required pattern can be obtained without independently using a mask plate, the cost and the alignment process of the mask plate are saved, on the other hand, the patterned flexible substrate is formed by adding the shielding layer as the mask plate, so that whether the equipment has the alignment function is not needed, the display substrate high-precision patterning without alignment is realized, so that whether equipment has an alignment mechanism or not and whether the display substrate has an alignment mark or not do not need to be considered, and the method is more convenient and feasible.

Therefore, the display substrate and the display device provided by the embodiment of the disclosure can realize high-precision laser lift-off, patterning of a specific area and a shape, can realize local bending of a display product, and provide a solution for curved surface display; meanwhile, the wiring area can be bent, and solutions are provided for narrow-frame display, frameless splicing display and the like.

Drawings

FIG. 1 is a schematic diagram illustrating a structure of alignment in a laser lift-off process according to the related art;

FIG. 2 is a schematic diagram of the laser scanning of FIG. 1;

FIG. 3 is a schematic diagram of a rigid carrier plate after a position corresponding to a laser lift-off region on a flexible substrate is removed;

FIG. 4 is a schematic diagram illustrating a laser scanning structure on a display substrate during a manufacturing process of the display substrate according to an embodiment of the disclosure;

FIG. 5 is a schematic diagram illustrating a structure of a display substrate obtained after laser lift-off during a process of manufacturing the display substrate according to an embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of a display substrate obtained after a rigid carrier is separated from a flexible substrate in a process of manufacturing the display substrate according to an embodiment provided in the disclosed embodiment;

FIG. 7 is a schematic diagram of a display substrate according to some embodiments of the present disclosure;

FIG. 8 is a schematic view of a display substrate according to still further embodiments of the present disclosure;

fig. 9 is a schematic structural diagram of a display substrate obtained after a rigid carrier is separated from a flexible substrate in a process of manufacturing the display substrate according to another embodiment provided in the disclosed embodiments;

FIG. 10 is a schematic view of a display substrate according to still further embodiments of the present disclosure;

FIG. 11 is a schematic view of a display substrate according to still other embodiments of the present disclosure.

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 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. Also, the use of the terms "a," "an," or "the" and similar referents do not denote a limitation of quantity, but rather denote the presence of at least one. 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.

In order to describe the display substrate and the display device provided in the embodiments of the present disclosure in more detail, the following description of the related art is provided.

In the related art, for example, in order to prepare a flexible display substrate, if some special forms such as bending and curved surface display are to be realized, a specific area of a product needs to realize a bending form with a fixed curvature. Generally, a method of performing regional laser peeling on a flexible substrate on a rigid carrier plate is adopted to separate the flexible substrate from a specific region of the rigid carrier plate, and then the rigid carrier plate in the specific region is removed. Specifically, when performing a laser lift-off operation for forming a specific region, the display substrate is provided with a registration mark, and the laser scanning is performed by setting a laser scanning start/stop point by the registration mark. However, due to the positioning position of the display substrate, the precision of mechanical fixation, and the like, the actual scanning area of the laser and the setting area usually have a scanning area deviation of millimeter order, and thus the requirement of regional stripping with some high precision requirements cannot be met. Fig. 1 shows that a flexible substrate 20 is coated on a rigid carrier 10, a display unit 30 is prepared on the flexible substrate 20, and an alignment mark 40 on the display substrate is used for aligning with a laser device to set a scanning start point and a scanning stop point of a laser 50, and fig. 2 is a schematic diagram of an actual stripped effect, where an area a is an actual laser scanning area. As can be seen from fig. 2, there is a large error range between the actual scanning area and the alignment mark. Fig. 2 and 3 are schematic diagrams illustrating a laser peeling process between a rigid carrier and a flexible substrate in the related art, and after the substrate shown in fig. 2 is irradiated with laser, as shown in fig. 3, the rigid carrier is cut in an area right opposite to a laser scanning area, and then the rigid carrier can be easily separated from the flexible substrate irradiated with laser, so as to remove the rigid carrier in the area. In order to realize any patterning of laser stripping, such as any irregular shapes of circles, ellipses, irregular shapes and the like, the patterning can be realized only by adding an additional mask plate, and one mask plate can only correspond to one pattern, so that the mask plate die sinking cost is increased.

In order to solve the above problem, embodiments of the present disclosure provide a display substrate, a display device, and a substrate stage, which can implement laser lift-off of patterning, and the patterning shape can be unlimited, and improve the laser lift-off patterning precision and reduce the cost.

As shown in fig. 6 to 11, a display substrate provided by an embodiment of the present disclosure includes: the flexible substrate comprises a rigid carrier plate 100, a flexible substrate 200 and a shielding layer 300, wherein the rigid carrier plate 100 comprises a hollow area 110; the flexible substrate 200 is located on the rigid carrier 100, and the flexible substrate 200 includes a first region 210 and a second region 220; the shielding layer 300 is located on the rigid carrier 100, and the shielding layer 300 includes an opening area 310 and a shielding area 320; wherein the figures of the hollow area 110, the opening area 310 and the first area 210 are completely overlapped in the orthographic projection of the rigid carrier 100.

In the above solution, the shielding layer 300 is added on the rigid carrier 100 of the display substrate, and the shielding layer 300 is patterned, so that the opening area 310 of the shielding layer 300 completely coincides with the front projection of the patterns of the hollow area 110 and the first area 210 on the first surface, so that the shielding layer 300 can serve as a mask in a laser lift-off process, a portion (i.e., the shielding area 320) shielded by the shielding layer cannot pass through the laser, and the flexible substrate 200 in a corresponding area cannot be irradiated, so that the flexible substrate 200 cannot be peeled off by the laser, while a portion (i.e., the opening area 310) not shielded normally receives the laser irradiation, and a lift-off area is formed on the flexible substrate 200, and then the rigid carrier 100 in an area corresponding to the lift-off area is removed, so that the flexible substrate 200 with the lift-off area capable of being bent at will be formed.

Thus, on the one hand, the patterns of the second region 220 and the first region 210 are determined by the patterns of the shielding region 320 and the opening region 310 of the shielding layer 300, so that the pattern of the first region 210 can be not limited to form a rectangular pattern, and can also realize regional laser lift-off of regular patterns or irregular patterns such as a circle, and the like, and a required pattern can be obtained without separately using a mask plate, thereby saving the cost of the mask plate, the alignment process and the like. On the other hand, the shielding layer is added to serve as a mask to form the patterned flexible substrate, so that whether equipment has an alignment function or not is not required to be considered, high-precision patterning of the display substrate without alignment is achieved, whether the equipment has an alignment mechanism or not is not required to be considered, whether the display substrate has an alignment mark or not is not required to be considered, and the method is more convenient and easy to implement. Therefore, the display substrate provided by the embodiment of the disclosure can realize high-precision laser lift-off, patterning of a specific area and a shape, can realize local bending of a display product, and provides a solution for curved surface display; meanwhile, the wiring area can be bent, and solutions are provided for narrow-frame display, frameless splicing display and the like.

In some exemplary embodiments, as shown in fig. 5 and 6, the shielding layer 300 has a groove structure thereon, and the groove structure is the opening area 310.

It should be noted that the opening area 310 on the shielding layer 300 functions as a peeling area for allowing laser to irradiate the flexible substrate 200, and therefore, in the above-mentioned embodiment, the shielding layer 300 may have a groove structure formed by patterning as the opening area 310, and in practical applications, the opening area 310 may be formed not by the groove structure but by other means, for example, the shielding layer 300 may have a transparent structure in the opening area 310.

Furthermore, in some exemplary embodiments, the rigid carrier 100 includes a first side and a second side opposite to each other, the flexible substrate 200 is located on the first side, and the shielding layer 300 is located on the second side.

With the above scheme, the flexible substrate 200 is disposed on the front surface, i.e. the first surface, of the rigid carrier 100, and the shielding layer 300 is disposed on the back surface, i.e. the second surface, of the rigid carrier 100, as shown in fig. 4, when laser irradiation is performed, laser is incident from the back surface of the rigid carrier 100, so that the shielding layer 300 functions as a mask.

In other embodiments, it is also possible that the flexible substrate 200 is located on the first surface, and the shielding layer 300 is located between the flexible substrate 200 and the first surface. Also, when laser irradiation is performed, laser is incident from the back surface of the rigid carrier 100, so that the shielding layer 300 functions as a reticle.

In addition, in some exemplary embodiments of the present disclosure, in the display substrate provided in the embodiments of the present disclosure, since the patterns of the second region 220 and the first region 210 are determined by the patterns of the shielding region 320 and the opening region 310 of the shielding layer 300, the orthographic projection shape of the pattern of the opening region 310 of the shielding layer 300 on the rigid carrier 100 may not be limited to a rectangle, but may be other regular patterns or irregular patterns, for example, regular patterns such as a circle, a triangle, a trapezoid, a diamond, or a special-shaped pattern other than the regular patterns.

Furthermore, in some exemplary embodiments, the shielding layer 300 includes an organic coating applied on the rigid carrier 100. That is, the shielding layer 300 may be formed by coating an organic coating on the rigid carrier 100, specifically, a glue material, such as a photosensitive glue, is coated on the rigid carrier 100, and the pattern of the desired shielding region 320 and the opening region 310 is exposed and developed by slit coating, spin coating, or the like, and then the excess photosensitive glue is removed to obtain the desired patterned shielding layer 300.

In other embodiments, the shielding layer 300 comprises an inkjet printed layer inkjet printed on the rigid carrier 100. That is, a patterned organic layer can be directly prepared on the rigid carrier 100 by inkjet printing, and after the organic layer is cured, a desired pattern is directly formed, so as to obtain the shielding layer 300.

It should be noted that, in the embodiment of the present disclosure, only one layer of the shielding layer 300 may be provided, or two or more layers of the shielding layer 300 may be provided, and the shielding layer 300 may be formed on the rigid carrier 100 only by coating, or formed on the rigid carrier 100 only by inkjet printing, or one layer of the shielding layer 300 may be formed on the rigid carrier 100 by coating, and the other layer of the shielding layer 300 is formed on the rigid carrier 100 by inkjet printing, which is not limited thereto.

It should be noted that the shielding layer 300 is made of an organic material, which mainly plays a role of blocking laser light, and at the same time, keeps the basic stability of the behavior, i.e., does not undergo significant physical and chemical changes under the irradiation of laser light, and therefore, for example, the material selected for the shielding layer 300 includes organic materials such as polymethyl methacrylate (PMMA), Polytetrafluoroethylene (PTFE), trifluoroacetic acid methacrylate (TFEMA), Polystyrene (PS), Polycarbonate (PC), and Polyphenylene Sulfide (PSs).

Further, in some exemplary embodiments, as shown in fig. 6, the substrate further includes: the display unit 400 is located on a side of the flexible substrate 200 away from the rigid carrier 100, the display unit 400 includes a driving circuit layer and a display layer, and the display unit 400 is only disposed in the first region 210, or the display unit 400 is only disposed in the second region 220, or the display unit 400 is disposed in both the first region 210 and the second region 220.

It should be noted that in the preparation process of the display substrate provided in the embodiment of the present disclosure, the flexible substrate 200 and the shielding layer 300 are first formed on the rigid carrier 100, then the substrate is irradiated by laser, so that the peeling area of the flexible substrate 200 is separated from the rigid carrier 100, and then the area corresponding to the peeling area on the rigid carrier 100 is removed, so as to form the hollow area 110.

In some embodiments, as shown in fig. 6 to 8, the first region 210 is located in a middle region of the display substrate, the second region 220 is located in an edge region of the display substrate, and the flexible substrate 200 is bent in the first region 210.

In the above embodiment, in the process of manufacturing the display substrate, after the laser lift-off, the rigid carrier 100 (i.e., the hollow 110) corresponding to the first region 210 may be cut and removed by a knife wheel or an infrared laser, and the obtained substrate is a display structure with two rigid ends and a flexible middle as shown in fig. 6. As shown in fig. 7, the display substrate can realize a curved surface shape of the display screen; alternatively, as shown in fig. 8, the display substrate may also be in a flip display screen mode.

In the above embodiment, the display substrate has a middle bending structure with rigid ends and a flexible middle bending, and in this case, the display unit 400 may be disposed only in the first region 210, only in the second region 220, or both the first region 210 and the second region 220 may be disposed with the display unit 400.

In other embodiments, as shown in fig. 9, the first region 210 is located at an edge region of the display substrate, the second region 220 is located at a middle region of the display substrate, and the flexible substrate 200 is bent at the first region 210.

In the above embodiment, in the process of manufacturing the display substrate, after the laser lift-off, the rigid carrier 100 (i.e., the hollow 110) corresponding to the first region 210 may be removed by cutting with a cutter wheel, and the obtained substrate is a display structure with a rigid middle part and flexible two ends as shown in fig. 9. In this way, the edge region of the display screen (for example, the edge region may include a frame, a lead, a bonding region, and the like) may be bent to the back of the display screen, so that an ultra-narrow frame or even a frameless display effect may be achieved, as shown in fig. 10. Meanwhile, as shown in fig. 11, a large-screen display product with a desired size can be obtained by splicing a plurality of display substrates with ultra-narrow frames or without frames, wherein a very small splicing gap exists between each small spliced screen and the corresponding small spliced screen, so that the display substrate in this embodiment can be applied to a large-size spliced display product.

In the above embodiment, the display substrate has an edge bending structure with a rigid middle part and flexible bending at two ends, in which case, the display unit 400 may be disposed only in the second region 220, and only the driving circuit layer of the display unit 400 may be disposed in the first region 210, without a display layer.

In order to describe the embodiments of the present disclosure in more detail, the following describes the process flow of the display substrate in the embodiments of the present disclosure in more detail:

the preparation process of the display device provided by the embodiment of the disclosure is as follows:

step S01, providing a rigid carrier 100;

step S02, coating a flexible substrate material on the rigid carrier 100 to form a flexible substrate 200, and forming the shielding layer 300 on the rigid carrier 100;

step S03, preparing a display unit 400 including a driving layer, a display layer, and the like on the flexible substrate 200;

step S04, as shown in fig. 5, forming a display substrate having the precise first region 210 (as shown in fig. 5) after laser irradiation by using the display substrate obtained in the step S03;

step S05, the hollow area 110 of the rigid carrier 100 of the display substrate is cut by a cutting method, since the first area 210 on the flexible substrate 200 receives laser irradiation, the hollow area 110 of the rigid carrier 100 is separated from the first area 210 of the flexible substrate 200, and when the hollow area 110 on the rigid carrier 100 is cut, the hollow area 110 of the rigid carrier 100 is removed, so as to obtain the display device provided in the embodiment of the present disclosure (as shown in fig. 6).

It should be noted that, in practical application, after the display unit 400 is manufactured, and before the laser lift-off, the shielding layer 300 may be prepared and patterned, and then the display substrate provided in the embodiment of the present disclosure is manufactured by performing processes such as the laser lift-off and the rigid carrier cutting.

In addition, the embodiment of the disclosure also provides a display device, which comprises the display substrate provided by the embodiment of the disclosure. Obviously, the display device provided in the embodiment of the present disclosure also has the beneficial effects that can be brought by the display substrate provided in the embodiment of the present disclosure, and details are not repeated herein.

In some embodiments, the first region 210 is located at an edge region of the display substrate, the second region 220 is located at a middle region of the display substrate, and the flexible substrate 200 is bent at the first region 210; the display device comprises a plurality of display substrates spliced together.

The following points need to be explained:

(1) the drawings of the embodiments of the disclosure only relate to the structures related to the embodiments of the disclosure, and other structures can refer to the common design.

(2) For purposes of clarity, the thickness of layers or regions in the figures used to describe embodiments of the present disclosure are exaggerated or reduced, i.e., the figures are not drawn on a true scale. It will be understood that when an element such as a layer, film, region, or display substrate is referred to as being "on" or "under" another element, it can be "directly on" or "under" the other element or intervening elements may be present.

(3) Without conflict, embodiments of the present disclosure and features of the embodiments may be combined with each other to arrive at new embodiments.

The above is only a specific embodiment of the present disclosure, but the scope of the present disclosure is not limited thereto, and the scope of the present disclosure should be determined by the scope of the claims.

Claims (10)

1. A display substrate, comprising:

the rigid carrier plate comprises a hollow area;

a flexible substrate on the rigid carrier, the flexible substrate including a first region and a second region;

and the shielding layer is positioned on the rigid carrier plate and comprises an opening area and a shielding area;

wherein, the orthographic projection of the figures of the hollowed-out area, the opening area and the first area on the rigid carrier plate is completely superposed.

2. The display substrate of claim 1,

the shielding layer comprises a groove structure, and the groove structure is the opening area.

3. The display substrate of claim 1,

the rigid carrier plate comprises a first surface and a second surface which are arranged in a reverse manner, the flexible substrate is positioned on the first surface, and the shielding layer is positioned on the second surface;

and/or the rigid carrier plate comprises a first surface and a second surface which are arranged oppositely, the flexible substrate is positioned on the first surface, and the shielding layer is positioned between the flexible substrate and the first surface.

4. The display substrate of claim 1,

the orthographic projection shapes of the figures of the hollow area, the opening area and the first area in the direction perpendicular to the first surface of the rigid carrier plate are regular figures or irregular figures, the regular figures comprise at least one of rectangles, circles, triangles, trapezoids and rhombuses, and the irregular figures comprise special-shaped figures except the regular figures.

5. The display substrate of claim 1,

the shielding layer comprises an organic coating coated on the rigid carrier plate; and/or the shielding layer comprises an ink-jet printing layer which is printed on the rigid carrier plate in an ink-jet mode.

6. The display substrate of claim 1,

the substrate further includes: the display unit is positioned on one side, far away from the rigid carrier plate, of the flexible substrate and comprises a driving circuit layer and a display layer, and the display unit is arranged in the first area and/or the second area.

7. The display substrate of claim 1,

the first area is located in the middle area of the display substrate, the second area is located in the edge area of the display substrate, and the flexible substrate is in a bent state in the first area.

8. The display substrate of claim 1,

the first area is located at the edge area of the display substrate, the second area is located at the middle area of the display substrate, and the flexible substrate is bent at the first area.

9. A display device comprising the display substrate according to any one of claims 1 to 8.

10. The display device according to claim 9,

the first area is located at the edge area of the display substrate, the second area is located at the middle area of the display substrate, and the flexible substrate is bent in the first area; the display device comprises a plurality of display substrates spliced together.

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