Display substrate and display device

Abstract

The present invention discloses a display substrate and a display device to improve the problem of stress concentration at the top corner / protrusion position of the opening position in the prior art, which is easy to cause cracks. The display substrate comprises: a plurality of island areas, an opening area between adjacent island areas, and a bridge area connecting adjacent island areas; the island area has at least one pixel; the opening area comprises a strip-shaped main opening area, and an end opening area located at the end of the main opening area; the end opening area comprises: relative extension edges; wherein one end of the extension edge is connected to the edge of the main opening area, and the spacing between the relative extension edges in the direction perpendicular to the extension direction of the main opening area is greater than the width of the main opening area in the direction perpendicular to the extension direction of the main opening area.

Description

Technical Field

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

[0002] As the next generation of flexible display technology, stretchable display provides more flexible and imaginative application scenarios. There are many ways to achieve stretchable display. After preparing the display pixel unit on the flexible substrate, various opening designs are made on the substrate to achieve the stretchability of the display. Summary of the invention

[0003] The present invention provides a display substrate and a display device, so as to improve the problem in the prior art that stress concentration occurs at the top corners / protrusions of the opening positions, which easily causes cracks.

[0004] An embodiment of the present invention provides a display substrate, comprising: a plurality of island regions, an opening region between adjacent island regions and penetrating the display substrate, and a bridge region connecting adjacent island regions; the island region has at least one pixel;

[0005] The opening area includes a strip-shaped main body opening area and an end opening area located at the end of the main body opening area;

[0006] The end opening area includes: relative extension edges and connecting edges; wherein, one end of the extension edge is connected to the edge of the main opening area, and the other end is connected to the connecting edge, the relative extension edges are connected and closed by the connecting edge, and the spacing between the relative extension edges in a direction perpendicular to the extension direction of the main opening area is greater than the width of the main opening area in the direction perpendicular to the extension direction of the main opening area.

[0007] In a possible implementation, in a direction from the main body opening area to the end opening area, the distance between the opposite extension edges in a direction perpendicular to the extension direction of the main body opening area gradually increases.

[0008] In a possible implementation manner, the extended edge is in an arc shape.

[0009] In a possible implementation manner, the connecting edge is in an elliptical arc shape.

[0010] In a possible implementation manner, the connecting edge is straight line-shaped.

[0011] In a possible implementation manner, the center of the circle corresponding to the extension edge coincides with the center of the connecting edge.

[0012] In a possible implementation manner, the symmetry axis of the opposite extension edge coincides with the symmetry axis of the connecting edge.

[0013] In a possible implementation manner, the connecting edge is in the shape of an elliptical arc, and the radius of the circle corresponding to the extended edge is equal to the major semi-axis of the ellipse corresponding to the connecting edge;

[0014] Alternatively, the connecting edge is in a straight line shape, and the radius of the circle corresponding to the extended edge is equal to half the length of the connecting edge.

[0015] In a possible implementation, the angle formed by the tangent of the extension edge at the intersection with the edge of the main opening area and the edge extension line is a first angle θ, and the range of the first angle θ satisfies: 0°<θ<90°.

[0016] In a possible implementation, R=L / cosθ, wherein L represents half of the distance between two opposite edges of the main body opening area, and R represents the radius of the circle corresponding to the extension edge.

[0017] In a possible implementation, the connecting edge is in a straight line shape, and a distance c between an intersection point of the edge of the main body opening area and the extension edge and the connecting edge satisfies: 0<c≤L*tanθ.

[0018] In a possible implementation manner, the range of L satisfies: 5 μm≤L≤50 μm.

[0019] In a possible implementation manner, the range of the major semi-axis of the ellipse corresponding to the elliptical arc-shaped connecting edge is 8 μm to 60 μm.

[0020] In a possible implementation manner, the range of the minor semi-axis of the ellipse corresponding to the elliptical arc-shaped connecting edge is 4 μm to 50 μm.

[0021] An embodiment of the present invention further provides a display device, which includes the display substrate provided by the embodiment of the present disclosure.

[0022] The beneficial effects of the embodiments of the present invention are as follows: In the embodiments of the present invention, the end opening area includes: relative epitaxial edges, and connecting edges; wherein, one end of the epitaxial edge is connected to the edge of the main opening area, and the other end is connected to the connecting edge, the relative epitaxial edges are connected and closed by the connecting edge, and the spacing between the relative epitaxial edges in a direction perpendicular to the extension direction of the main opening area is greater than the width of the main opening area in a direction perpendicular to the extension direction of the main opening area, which significantly improves the stress concentration site, disperses the stress concentration, improves the pulling performance of the pullable substrate, and improves the problem of stress concentration at the top corner / protrusion position of the opening position in the prior art, which is prone to cracks. Moreover, it is compatible with the existing production process, does not require a new mask plate, only needs to change the existing mask plate design pattern, and the process is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of a display panel in the prior art;

[0024] Figure 2 A schematic diagram of cracks generated at the end of an opening area in the prior art;

[0025] Figure 3 It is a stress diagram when the end of the opening area is a right angle;

[0026] Figure 4A This is one of the schematic diagrams of a display substrate provided in an embodiment of the present invention;

[0027] Figure 4B The second schematic diagram of the display substrate provided in the embodiment of the present invention;

[0028] Figure 5A This is one of the partial enlarged schematic diagrams of the display substrate provided in the embodiment of the present invention;

[0029] Figure 5B The second partial enlarged schematic diagram of the display substrate provided in the embodiment of the present invention;

[0030] Figure 5C The third partial enlarged schematic diagram of the display substrate provided in the embodiment of the present invention;

[0031] Figure 6 for Figure 5A Corresponding stress diagram;

[0032] Figure 7 The fourth partial enlarged schematic diagram of the display substrate provided in the embodiment of the present invention;

[0033] Figure 8 It is a schematic diagram of stress when the end of the opening area has different shapes;

[0034] Fig. 9A schematic cross-sectional view of a display substrate provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0036] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0037] In order to keep the following description of the embodiments of the present disclosure clear and concise, the present disclosure omits detailed descriptions of well-known functions and well-known components.

[0038] For stretchable display products, for opening structures, such as I-shaped openings or straight openings, when the substrate / display device is stretched under force, stress concentration occurs at the top corners / protrusions of the opening position, and fracture cracks preferentially occur at the stress concentration position, limiting the pulling amount and reliability of the stretchable substrate / stretchable display device, and increasing the failure risk of the display substrate / display device.

[0039] For a common display substrate with a straight / I-shaped opening, combined with Figure 1 As shown, it generally includes: a plurality of island areas S10, an opening area S20 located between adjacent island areas S10, and a bridge area S30 connecting adjacent island areas S10; the island area S10 has at least one pixel p; when stretched, the opening area S20 is greatly deformed, and the island area S10 is slightly deformed, so that the pixels in the island area S10 are not affected by the tensile strain, thereby realizing the stretchable deformation of the display panel. When stretched, the opening area S20 is subjected to a large deformation, and at the top corner of the opening area S20, due to the stress concentration effect, such as Figure 2 As shown in Figure 1, cracks preferentially appear at the top corners, destroying the display performance of the stretched substrate / stretched panel. A mechanical simulation is performed to simulate the stress concentration phenomenon at the top corners of the open hole structure. The stress is concentrated at the top corners, as shown in Figure 1. Figure 3 shown.

[0040] In view of this, see Figure 4A , Figure 4B and Figure 5A As shown, Figure 5A for Figure 4A , Figure 4B A partial enlarged schematic diagram of the end of the opening area, an embodiment of the present invention provides a display substrate, including: a plurality of island areas S1, an opening area S2 located between adjacent island areas S1 and penetrating the display substrate, and a bridge area S3 connecting adjacent island areas S1; the island area S1 has at least one pixel p;

[0041] The opening area S2 includes a strip-shaped main opening area S21 and an end opening area S22 located at at least one side of the main opening area S21;

[0042] The end opening area S22 includes: opposite extension edges 2, such as Figure 5A Two sections of extended edges 2 are located on the upper and lower sides; wherein, one end of the extended edge 2 is connected to the edge 1 of the main opening area S21, and the spacing k21 between the relative extended edges 2 in the extension direction CD perpendicular to the main opening area S21 is greater than the width k1 of the main opening area S21 in the extension direction CD perpendicular to the main opening area S21.

[0043] In an embodiment of the present invention, the end opening area S22 includes: a relative epitaxial edge 2, one end of the epitaxial edge 2 is connected to the edge 1 of the main opening area S21, and the spacing k21 of the relative epitaxial edges 2 in the extension direction CD perpendicular to the main opening area S21 is greater than the width k1 of the main opening area S21 in the extension direction CD perpendicular to the main opening area S21, which significantly improves the stress concentration site, disperses the stress concentration, improves the pulling performance of the pullable substrate, and improves the problem of stress concentration at the top corner / protrusion position of the opening position in the prior art, which is prone to cracks. Moreover, it is compatible with the existing production process, does not require a new mask plate, and only needs to change the existing mask plate design pattern, and the process is simple.

[0044] In one possible implementation, combining Figure 5A The end opening area S22 also includes: a connecting edge 3; the other end of the extension edge 2 is connected to the connecting edge 3, and the opposite extension edges 2 are connected and closed by the connecting edge 3.

[0045] In a possible implementation, Figure 4AAs shown, each opening area S2 includes a main body opening area S21, different main body opening areas S21 are spaced apart from each other, and each opening area S2 is substantially in the shape of a "one". In another possible embodiment, as Figure 4B As shown, each opening area S2 includes three strip-shaped main opening areas S21, and the three main opening areas S21 of each opening area S2 are connected to each other to form an "I" shape.

[0046] In a possible implementation, in the direction from the main body opening area S21 to the end opening area S22, the distance k2 between the opposite extension edges 2 in the direction perpendicular to the extension direction CD of the main body opening area S21 gradually increases. Figure 5A As shown, the spacing k21 of the relative epitaxial edges 2 at point E in the direction CD perpendicular to the main opening area S21 is smaller than the spacing k22 of the relative epitaxial edges 2 at point F in the direction CD perpendicular to the main opening area S21. In the embodiment of the present invention, the spacing k2 of the relative epitaxial edges 2 in the direction CD perpendicular to the main opening area S21 gradually increases, which can better improve the stress concentration site and disperse the stress concentration. It can be understood that due to the limitation of process error, the "vertical" here may not be strictly 90° vertical, and the angle between the two may be in the range of 90°±10°, and the technical effect of the present solution can be achieved.

[0047] In a specific implementation, at least one of the two opposite extended edges 2 is in an arc shape, and one of the extended edges 2 may be in an arc shape and the other may be in a non-arc shape. For example, it may be in a straight line shape extending from the edge 1 of the main opening area S21 in the same direction as the edge 1, such as Figure 5B As shown, it can also be a beveled edge extending from the edge 1 of the main body opening area S21 at a certain angle to the edge 1 to a side away from the extension line of the edge 1, such as Figure 5C As shown, or, it can also be other shapes.

[0048] In one possible implementation, combining Figure 5A , both extension edges 2 are arc-shaped, both extension edges 2 are arc-shaped, both extension edges 2 correspond to the same circle, and both extension edges 2 are symmetrical about the first straight line G1H1, the first straight line G1H1 passes through the center of the circle corresponding to the extension edge 2, and is parallel to the extension direction of the main body opening area S21. In the disclosed embodiment, both extension edges 2 are arc-shaped, both extension edges 2 are arc-shaped, both extension edges 2 correspond to the same circle, and both extension edges 2 are symmetrical about the first straight line G1H1, which has a better effect of improving and reducing the stress concentration problem at the top corner position of the opening area during the stretching process.

[0049] In one possible implementation, combining Figure 5A, the connecting edge 3 is an elliptical arc, the radius R of the circle corresponding to the extended edge 2 is equal to the major semi-axis a of the ellipse corresponding to the connecting edge 3. In the embodiment of the present invention, the extended edge 2 is an arc, the connecting edge 3 is an elliptical arc, the radius R of the circle corresponding to the extended edge 2 is equal to the major semi-axis a of the ellipse corresponding to the connecting edge 3, and the Figure 6 As shown, the stress is evenly distributed on the edge of the elliptical arc, and the stress value is the smallest. At the intersection of the straight edge 1 of the main opening area S21 and the arc-shaped extended edge 2, the stress is reduced by nearly one order of magnitude, which effectively reduces the stress concentration problem at the top corner of the opening area during the stretching process.

[0050] In one possible implementation, combining Figure 7 As shown, the connecting edge 3 is straight, and the radius R of the circle corresponding to the extension edge 2 is equal to half the length of the connecting edge 3. In the embodiment of the present invention, the extension edge 2 is arc-shaped, the connecting edge 3 is straight, and the radius R of the circle corresponding to the extension edge 2 is equal to half the length of the connecting edge 3. Figure 8 As shown, Figure 8 show Figure 7 The mechanical strain simulation corresponding to the structure shows that, compared with the right-angled and semicircular opening pattern designs, the opening structure design in which the extension edge 2 of the embodiment of the present invention is arc-shaped and the connecting edge 3 is linear, at the intersection of the straight edge 1 of the main opening area S21 and the arc-shaped extension edge 2 (such as Figure 7 The strain at the middle vertex angle A is significantly reduced; the test results of the maximum strain (corresponding to the overall tensile deformation of the substrate is 5%) and the strain at the vertex angle A show that by adopting the design pattern of the present invention, the strain at the vertex angle is reduced, thereby increasing the stretching amount of the display substrate.

[0051] In one possible implementation, combining Figure 5A and Figure 7 As shown, the center O of the circle corresponding to the epitaxial edge 2 coincides with the center O' of the connecting edge 3. Specifically, when the connecting edge 3 is in the shape of an elliptical arc, the center O' of the connecting edge 3 may be the center of the ellipse corresponding to the connecting edge 3; when the connecting edge 3 is in the shape of a straight line, the center O' of the connecting edge 3 may be the center of the line segment corresponding to the connecting edge 3. It is understandable that, due to process errors, it is difficult to require that the center O of the circle corresponding to the epitaxial edge 2 coincides with the center O' of the connecting edge 3 strictly and completely. In the embodiments of the present disclosure, the "coincidence" of the two may be understood as a rough coincidence within the range of process errors.

[0052] In one possible implementation, combining Figure 5A or Figure 7As shown, the symmetry axis G1H2 of the relative epitaxial edge 2 coincides with the symmetry axis G2H2 of the connecting edge 3. It is understandable that, due to process errors, it is difficult to require the symmetry axis G1H2 of the relative epitaxial edge 2 to strictly and completely coincide with the symmetry axis G2H2 of the connecting edge 3. In the embodiment of the present disclosure, the "coincidence" between the two can be understood as a rough coincidence within the range of process errors.

[0053] In one possible implementation, combining Figure 5A or Figure 7 As shown, the angle formed by the tangent line AB of the extension edge 2 at the intersection position A with the edge 1 of the main opening area S21 and the extension line of the edge 1 is the first angle θ, and the range of the first angle θ satisfies: 0°<θ<90°. Specifically, the range of the first angle θ satisfies: 40°<θ<50°. Specifically, the first angle θ is 45°.

[0054] In one possible implementation, combining Figure 5A or Figure 7 As shown, R=L / cosθ, where L represents half of the distance between the two opposite edges 1 of the main body opening area S21, and R represents the circle radius R corresponding to the extension edge 2. Specifically, when the connecting edge 3 is an elliptical arc, the circle radius R corresponding to the extension edge 2 is equal to the major semi-axis a of the ellipse corresponding to the connecting edge 3.

[0055] In one possible implementation, combining Figure 7 As shown, when the connecting edge 3 is in a straight line, the distance c between the intersection point A of the edge 1 of the main opening area S21 and the extension edge 2 and the connecting edge 3 satisfies: 0<c≤L*tanθ.

[0056] In one possible implementation, combining Figure 5A or Figure 7 As shown, the range of L satisfies: 5 μm≤L≤50 μm. Specifically, L may be 7.5 μm.

[0057] In one possible implementation, combining Figure 5A As shown, the range of the ellipse major semi-axis a corresponding to the ellipse arc-shaped connecting edge 3 is: 8 μm to 60 μm. Specifically, the ellipse major semi-axis a can be 10.61 μm.

[0058] In one possible implementation, combining Figure 5A As shown, the ellipse minor semi-axis b corresponding to the ellipse arc-shaped connecting edge 3 is in the range of 4 μm to 50 μm, wherein b<a. Specifically, the ellipse minor semi-axis b may be 5 μm.

[0059] In a specific implementation, the display panel provided in the embodiment of the present invention may be, for example, an electroluminescent display panel. The electroluminescent display panel may be, for example, an organic light emitting diode display panel, an inorganic light emitting diode display panel, or a quantum dot light emitting diode display panel. The organic light emitting diode display panel may be, for example, an active organic light emitting diode (AMOLED) or a passive organic light emitting diode (PMOLED).

[0060] In a specific implementation, the display substrate of AMOLED, such as Fig. 9 As shown, it may include a base substrate 11, and the following are located on one side of the base substrate 11: a buffer layer 15, an active layer 16, a first gate insulating layer 17, a first metal layer 18, a second gate insulating layer 19, a second metal layer 110, an interlayer dielectric layer 111, a third metal layer 112, a first flat layer 113, a fourth metal layer 114, a second flat layer 115, a pixel definition layer 116, an anode 117, a light-emitting functional layer 118, a cathode 119, and an encapsulation layer 120; wherein the first metal layer 18 includes a gate 121 and a first electrode 122 of a capacitor, the second metal layer 110 includes a second electrode 123 of a capacitor, and the third metal layer 112 may specifically include a source 124 and a drain 125. The fourth metal layer 114 may specifically include a lap electrode 126, wherein the lap electrode 126 is, for example, conductively connected to the drain 125. The encapsulation layer, for example, includes an inorganic encapsulation layer and an organic encapsulation layer located on the inorganic encapsulation layer. Specifically, the opening area S2 penetrates at least one of the following film layers:

[0061] Base substrate 11;

[0062] Buffer layer 15;

[0063] A first gate insulating layer 17;

[0064] A second gate insulating layer 19;

[0065] Interlayer dielectric layer 111;

[0066] A first flat layer 113;

[0067] A second flat layer 115;

[0068] The encapsulation layer 120 .

[0069] In a possible implementation, the opening area S2 may penetrate the base substrate 11 , the buffer layer 15 , the first gate insulating layer 17 , the second gate insulating layer 19 , the interlayer dielectric layer 111 , the first planarizing layer 113 , the second planarizing layer 115 , and the encapsulation layer 120 .

[0070] An embodiment of the present invention further provides a display device, which includes a display substrate provided by the embodiment of the present disclosure.

[0071] The beneficial effects of the embodiments of the present invention are as follows: In the embodiments of the present invention, the end opening area S22 includes: a relative epitaxial edge 2; wherein, one end of the epitaxial edge 2 is connected to the edge 1 of the main opening area S21, and the relative epitaxial edge 2 is connected and closed by a connecting edge 3, and the spacing k21 of the relative epitaxial edges 2 on the extension direction CD perpendicular to the main opening area S21 is greater than the width k1 of the main opening area S21 on the extension direction CD perpendicular to the main opening area S21, which significantly improves the stress concentration site, disperses the stress concentration, improves the pulling performance of the pullable substrate, and improves the problem of stress concentration at the top corner / protrusion position of the opening position in the prior art, which is prone to cracks. Moreover, it is compatible with the existing production process, does not require a new mask plate, only needs to change the existing mask plate design pattern, and the process is simple.

[0072] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A display substrate, wherein: include: A plurality of island regions, an opening region between adjacent island regions and penetrating the display substrate, and a bridge region connecting adjacent island regions; The island area has at least one pixel; The opening area includes a strip-shaped main opening area and end opening areas located on both sides of the main opening area; The end opening area includes: opposite extension edges; wherein one end of the extension edge is connected to the edge of the main opening area, and the spacing between the opposite extension edges in a direction perpendicular to the extension direction of the main opening area is greater than the width of the main opening area in a direction perpendicular to the extension direction of the main opening area; In the direction from the main body opening area to the end opening area, both of the end opening areas satisfy: the spacing between the opposite extension edges in the direction perpendicular to the extension direction of the main body opening area gradually increases.

2. The display substrate according to claim 1, wherein: The end opening area further includes: a connecting edge; the other end of the extension edge is connected to the connecting edge, and the opposite extension edges are connected and closed by the connecting edge.

3. The display substrate according to claim 2, wherein: At least one of the extension edges is in an arc shape.

4. The display substrate according to claim 3, wherein: The two extended edges are both arc-shaped, the two extended edges correspond to the same circle, and the two extended edges are symmetrical about a first straight line. The first straight line passes through the center of the circle corresponding to the extended edge and is parallel to the extension direction of the main body opening area.

5. The display substrate according to claim 4, wherein: The connecting edge is in the shape of an elliptical arc, and the radius of the circle corresponding to the extended edge is equal to the major semi-axis of the ellipse corresponding to the connecting edge.

6. The display substrate according to claim 4, wherein: The connecting edge is in a straight line shape, and the radius of the circle corresponding to the extended edge is equal to half the length of the connecting edge.

7. The display substrate according to claim 5 or 6, wherein: The center of the circle corresponding to the extension edge coincides with the center of the connecting edge.

8. The display substrate according to claim 7, wherein: The symmetry axis of the opposite extension edge coincides with the symmetry axis of the connecting edge.

9. The display substrate according to claim 5, wherein: The range of the major semi-axis of the ellipse corresponding to the elliptical arc-shaped connecting edge is 8 μm to 60 μm; the range of the minor semi-axis of the ellipse corresponding to the elliptical arc-shaped connecting edge is 4 μm to 50 μm.

10. The display substrate according to claim 3, wherein: The angle formed by the tangent line of the extension edge at the intersection with the edge of the main body opening area and the edge extension line is a first angle θ, and the range of the first angle θ satisfies: 0°<θ<90°.

11. The display substrate according to claim 10, wherein: R=L / cosθ, wherein L represents half of the distance between the two opposite edges of the main opening area, and R represents the radius of the circle corresponding to the extension edge.

12. The display substrate according to claim 11, wherein: The connecting edge is in a straight line shape, and the distance c between the intersection point of the edge of the main body opening area and the extension edge and the connecting edge satisfies: 0<c≤L*tanθ.

13. The display substrate according to claim 1, wherein: The display substrate comprises a base substrate, and the following components are sequentially located on one side of the base substrate: a buffer layer, an active layer, a first gate insulating layer, a first metal layer, a second gate insulating layer, a second metal layer, an interlayer dielectric layer, a third metal layer, a first flat layer, a fourth metal layer, a second flat layer, a pixel definition layer, an anode, a light emitting functional layer, a cathode, and an encapsulation layer; The open area passes through at least one of the following structures: the buffer layer; the first gate insulating layer; the second gate insulating layer; A dielectric layer between conductive layers; the first flat layer; the second flat layer; The encapsulation layer.

14. A display device, wherein: Comprising the display substrate as described in any one of claims 1-13.

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