A display panel, a spliced display screen and a display device

Abstract

The display panel, the spliced display screen and the display device belong to the technical field of display. The display panel in the present disclosure comprises a substrate, a first signal line and a pixel unit arranged on the substrate; the pixel unit comprises a plurality of light emitting devices of different colors; wherein the display panel further comprises a source-drain conductive layer on the substrate, the first signal line is located on the source-drain conductive layer, and the light emitting device is located on the side of the source-drain conductive layer away from the substrate; the first signal line extends along a second direction, the size of the opening area of the light emitting device in the second direction is smaller than that in a first direction, and the first direction intersects with the second direction.

Description

Technical Field

[0001] This disclosure belongs to the field of display technology, specifically relating to a display panel, a splicing display screen, and a display device. Background Technology

[0002] In the manufacturing process of display panels, large-size display panels require multiple splicing exposure processes. However, due to the limitations of the exposure accuracy of the exposure machine, there are certain areas of repeated exposure near the splicing seams of the splicing screen, which can easily affect the normal display at the seams and cause problems such as splicing mura. Summary of the Invention

[0003] This disclosure aims to at least solve one of the technical problems existing in the related art, and to provide a display panel, a video wall display, and a display device.

[0004] In a first aspect, the technical solution adopted to solve the technical problem of this disclosure is a display panel, including a substrate, a first signal line and a pixel unit disposed on the substrate; the pixel unit includes a plurality of light-emitting devices of different colors; wherein, the display panel further includes a source-drain conductive layer located on the substrate, the first signal line is located on the source-drain conductive layer, and the light-emitting devices are located on the side of the source-drain conductive layer away from the substrate.

[0005] The first signal line extends along the second direction, and the size of the opening area of ​​the light-emitting device in the second direction is smaller than the size in the first direction, and the first direction intersects the second direction.

[0006] In some embodiments, the plurality of light-emitting devices of different colors includes a first light-emitting device, a second light-emitting device, a third light-emitting device, and a fourth light-emitting device;

[0007] For any pixel unit, the first light-emitting device and the third light-emitting device are arranged opposite each other along the second direction, and the second light-emitting device and the fourth light-emitting device are arranged opposite each other along the second direction; the first light-emitting device and the second light-emitting device are arranged opposite each other along the first direction, and the third light-emitting device and the fourth light-emitting device are arranged opposite each other along the first direction.

[0008] In some embodiments, the light-emitting device includes a light-emitting layer, and the light-emitting layer located in the opening area of ​​the light-emitting device includes a main body portion and a protrusion disposed on at least one side of the main body portion in the first direction.

[0009] In some embodiments, the protrusion and the main body are integrally formed.

[0010] In some embodiments, the ratio of the dimensions of the protrusion and the main body in the first direction is between 0.01 and 0.3; and / or,

[0011] The ratio of the dimensions of the protrusion and the main body in the second direction is between 0.01 and 0.5.

[0012] In some embodiments, the first signal line includes a first main body segment and a second main body segment, as well as a transition segment connecting the first main body segment and the second main body segment;

[0013] The first main line segment and the second main line segment are parallel to each other and have different extension directions from the transition line segment;

[0014] For any pixel unit, the first light-emitting device and the second light-emitting device are respectively disposed corresponding to the first main body line segment, and the third light-emitting device and the fourth light-emitting device are respectively disposed corresponding to the second main body line segment; the shortest distance from the orthographic projection of the first main body line segment on the substrate to the orthographic projection of the opening area of ​​the first light-emitting device on the substrate is equal to the shortest distance from the orthographic projection of the second main body line segment on the substrate to the orthographic projection of the opening area of ​​the third light-emitting device on the substrate; the shortest distance from the orthographic projection of the first main body line segment on the substrate to the orthographic projection of the opening area of ​​the second light-emitting device on the substrate is equal to the shortest distance from the orthographic projection of the second main body line segment on the substrate to the orthographic projection of the opening area of ​​the fourth light-emitting device on the substrate.

[0015] In some embodiments, the first main body segment includes a first side and a second side disposed opposite to each other along the second direction; the second main body segment includes a third side and a fourth side disposed opposite to each other along the second direction;

[0016] The extension line of the orthographic projection of the second side onto the substrate is collinear with the extension line of the orthographic projection of the third side onto the substrate.

[0017] In some embodiments, the display panel further includes a pixel defining layer disposed on the side of the source / drain conductive layer opposite to the substrate; the pixel defining layer has a sub-pixel opening located in the opening region of the light-emitting device; the light-emitting layer of the light-emitting device at least covers the sub-pixel opening;

[0018] The pixel defining layer has at least one groove on the surface near the substrate and / or the surface away from the substrate and a protrusion defining the groove.

[0019] In some embodiments, the extending directions of the first main body segment and the second main body segment are the same as the extending direction of the groove;

[0020] The widths of the first main body segment, the second main body segment, and the groove are all equal in the first direction.

[0021] In some embodiments, for two adjacent first signal lines whose orthographic projection on the substrate is located between the orthographic projections of two adjacent sub-pixel openings on the substrate, the orthographic projection of the groove on the substrate is located between the extension line of the orthographic projection of the first side of the first main body segment of the first first signal line on the substrate and the extension line of the orthographic projection of the fourth side of the second main body segment of the second first signal line on the substrate.

[0022] The first distance between the second side of the first main body segment of the first signal line and the first side of the first main body segment of the second signal line projected onto the substrate is equal to the second distance between the fourth side of the second main body segment of the first signal line and the third side of the second main body segment of the second signal line projected onto the substrate, and is equal to the width of the groove in the first direction.

[0023] In some embodiments, the orthographic projection of the groove on the substrate is located between the extension line of the orthographic projection of the first side of the first main body segment of the first signal line on the substrate and the extension line of the orthographic projection of the fourth side of the second main body segment on the substrate.

[0024] Secondly, embodiments of this disclosure also provide a splicing display screen, including a plurality of spliced ​​display panels as described in any of the first aspects; the extension direction of the splicing gap of the spliced ​​display panels is the second direction.

[0025] Thirdly, embodiments of this disclosure also provide a display device, including the splicing display screen as described in the second aspect. Attached Figure Description

[0026] Figure 1 This is a schematic diagram showing the arrangement of different color light-emitting devices in a related display panel;

[0027] Figure 2a A schematic diagram of an exemplary display panel provided for an embodiment of this disclosure;

[0028] Figure 2b for Figure 2a A simplified cross-sectional diagram along the AA' direction in the structure;

[0029] Figure 3a A schematic diagram of an exemplary light-emitting layer located in the opening region of a light-emitting device, provided for an embodiment of this disclosure;

[0030] Figure 3b A schematic diagram of another exemplary light-emitting layer located in the opening region of a light-emitting device, provided for an embodiment of this disclosure;

[0031] Figure 4 A schematic diagram of the first signal line provided in an embodiment of this disclosure;

[0032] Figure 5 A schematic diagram of another exemplary display panel provided in an embodiment of this disclosure;

[0033] Figure 6 A schematic diagram illustrating an exemplary first signal line and groove distribution provided for an embodiment of this disclosure;

[0034] Figure 7 This is a schematic diagram of another exemplary first signal line and groove distribution provided for an embodiment of this disclosure.

[0035] The reference numerals in the attached figures are as follows: 100, pixel unit; 1, substrate; 2, source / drain conductive layer; 21, first signal line; 211, first main body line segment; 212, second main body line segment; 213, adapter line segment; R, first light-emitting device; G, second light-emitting device; B, third light-emitting device; W, fourth light-emitting device; X, first direction; Y, second direction; 3, light-emitting layer; 31, main body portion; 32, protrusion portion; PDL, pixel limiting layer; 4, groove; C1, first side; C2, second side; C3, third side; C4, fourth side. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. The components of the embodiments of this disclosure described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of this disclosure provided in the accompanying drawings is not intended to limit the scope of the claimed disclosure, but merely represents selected embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without inventive effort are within the scope of protection of this disclosure.

[0037] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an,” “a,” or “the,” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “including,” “comprising,” or “containing,” and similar terms mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. The terms “connected,” “linked,” or similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” and “right,” etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0038] In this disclosure, "multiple or several" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0039] In related technologies, the multiple exposures during the fabrication process of large-size splicing screens are limited by the exposure accuracy of the exposure machine, resulting in certain areas of repeated exposure near the splicing seams. Based on this splicing exposure method, the inventors have discovered at least the following problems in related technologies: 1. Due to fluctuations in exposure coverage at the splicing seams, the position of the opening area of ​​the light-emitting device changes. For example, the orthographic projection of some opening areas on the substrate overlaps with the orthographic projection of the metal traces, thereby reducing the effective light-emitting area of ​​the light-emitting device and causing splicing mura at the splicing seams; 2. In related technologies, the pixel limiting layer used to define the sub-pixel openings has an anti-leakage structure to prevent light leakage between adjacent sub-pixels. However, fluctuations and shifts in the anti-leakage structure can lead to different coverage areas of the metal traces directly opposite it, resulting in different reflective intensities, causing splicing mura and display abnormalities.

[0040] For example, Figure 1 This is a schematic diagram showing the arrangement of different color light-emitting devices in a related display panel, such as... Figure 1As shown, a pixel unit 100 includes a red light-emitting device R, a green light-emitting device G, a blue light-emitting device B, and a white light-emitting device W. The red light-emitting device R, green light-emitting device G, blue light-emitting device B, and white light-emitting device W are arranged in a line. Signal lines located in the source / drain conductive layer, such as data lines Data and power signal lines Vdd, have their orthogonal projections on the substrate located between the orthogonal projections of adjacent light-emitting devices on the substrate. The extension direction of the data lines is the same as the length direction of the opening region VV of the light-emitting devices; therefore, the size of the opening region VV of the light-emitting devices in the extension direction of the data lines (e.g., the second direction Y) is larger than its size in the first direction X.

[0041] Thus, due to the limitations of the exposure accuracy of the exposure machine, during the process of multiple splicing exposures of the splicing screen, once the position of the opening area VV of the light-emitting device changes, for example, the orthographic projection of the opening area VV of some light-emitting devices on the substrate 1 overlaps with the orthographic projection of the data line, thereby reducing the effective light-emitting area of ​​the light-emitting device and causing splicing murras at the splicing seam.

[0042] In view of this, the present disclosure provides a display panel including a substrate, a first signal line and a pixel unit disposed on the substrate; the pixel unit includes a plurality of light-emitting devices of different colors; wherein, the display panel further includes a source-drain conductive layer located on the substrate, the first signal line is located on the source-drain conductive layer, and the light-emitting devices are located on the side of the source-drain conductive layer away from the substrate; the first signal line extends along a second direction, the size of the opening area of ​​the light-emitting device in the second direction is smaller than the size in the first direction, and the first direction intersects the second direction.

[0043] Because the first signal line extends along the second direction, and the size of the opening region of the light-emitting device in the second direction is smaller than its size in the first direction, once the position of the opening region of the light-emitting device changes, the orthographic projection of part of the opening region of the light-emitting device on the substrate 1 overlaps with the orthographic projection of the first signal line. This disclosure, compared to related technologies (such as...),... Figure 1 The structure shown has its overlapping position changed from the long side to the short side, which can reduce the overlapping area between the opening area of ​​the light-emitting device and the first signal line to a certain extent, and thus increase the effective light-emitting area of ​​the light-emitting device to a certain extent, thereby reducing the splicing Mura phenomenon.

[0044] The specific structure of a display panel provided in the embodiments of this disclosure will be described in detail below.

[0045] Figure 2a This is a schematic diagram of an exemplary display panel provided in an embodiment of this disclosure. Figure 2b for Figure 2a A simplified cross-sectional diagram of the structure along the AA' direction, as shown below. Figure 2a and Figure 2b As shown, the display panel includes a substrate 1, a first signal line 21 disposed on the substrate 1, and pixel units 100. The pixel unit 100 includes multiple light-emitting devices of different colors, such as a red light-emitting device R, a green light-emitting device G, a blue light-emitting device B, and a white light-emitting device W.

[0046] like Figure 2b As shown, the display panel also includes a source / drain conductive layer 2 located on the substrate 1, a first signal line 21 located on the source / drain conductive layer 2, and a light-emitting device located on the side of the source / drain conductive layer 2 away from the substrate 1.

[0047] like Figure 2a As shown, the first signal line 21 extends along the second direction Y.

[0048] The display panel also includes a second signal line disposed on the substrate 1, the second signal line extending along a first direction X. The first signal line 21 is, for example, a data line for transmitting a data voltage signal. The second signal line is, for example, a gate line for transmitting a gate scan signal. The first signal line 21 and the second signal line are intersected and define a plurality of pixel units 100.

[0049] For example, the first signal line 21 may be a power signal line for transmitting a power supply voltage signal; or, the first signal line 21 may be a detection signal line for transmitting a sensing signal.

[0050] For example, the display panel in this embodiment of the present disclosure has a bottom-emitting structure, and the light emitted by the light-emitting device is emitted from the side of the substrate 1 away from the light-emitting device.

[0051] like Figure 2a As shown, the first signal line 21 extends along the second direction Y, and the size of the opening region VV of the light-emitting device in the second direction Y is smaller than the size in the first direction X. The first direction X intersects the second direction Y.

[0052] For example, such as Figure 2a As shown, the first direction X and the second direction Y are perpendicular to each other.

[0053] For example, the size of the opening region VV of the light-emitting device in the second direction Y is smaller than the size in the first direction X. This means that the length direction of the opening region VV of the light-emitting device is the first direction X and the width direction is the second direction Y. Compared with the related technology, where the length direction of the opening region VV of the light-emitting device is the second direction Y and the width direction is the first direction X, once the position of the opening region VV of the light-emitting device changes, this disclosure can reduce the overlap area between the opening region VV of the light-emitting device and the first signal line 21 to a certain extent, which also increases the effective light-emitting area of ​​the light-emitting device to a certain extent, thereby reducing the splicing Mura phenomenon.

[0054] In some embodiments, such as Figure 2a As shown, multiple light-emitting devices of different colors include a first light-emitting device R, a second light-emitting device G, a third light-emitting device B, and a fourth light-emitting device W; for any pixel unit 100, the first light-emitting device R and the third light-emitting device B are arranged opposite each other along the second direction Y, and the second light-emitting device G and the fourth light-emitting device W are arranged opposite each other along the second direction Y; the first light-emitting device R and the second light-emitting device G are arranged opposite each other along the first direction X, and the third light-emitting device B and the fourth light-emitting device W are arranged opposite each other along the first direction X.

[0055] For example, the first light-emitting device R is a red light-emitting device R, the second light-emitting device G is a green light-emitting device G, the third light-emitting device B is a blue light-emitting device B, and the fourth light-emitting device W is a white light-emitting device W.

[0056] Of course, provided that the light-emitting devices in the pixel unit meet the "grid" arrangement, the positions of different colored light-emitting devices can be changed according to actual needs. However, in this disclosure, the embodiments are described using the example of the first light-emitting device R being a red light-emitting device R, the second light-emitting device G being a green light-emitting device G, the third light-emitting device B being a blue light-emitting device B, and the fourth light-emitting device W being a white light-emitting device W.

[0057] The following explanation uses an example of a sub-pixel opening V located in the opening region VV of a light-emitting device, with a length of 125 μm and a width of 45 μm. Related technologies such as... Figure 1 The structure shown has a sub-pixel opening V with dimensions of 125μm × 45μm. If repeated exposure causes fluctuations in the sub-pixel opening V, for example, if the sub-pixel opening V moves along the first direction X, the overlap area between the sub-pixel opening V and the projection of the first signal line 21 onto the substrate 1 is 125μm × H, where H represents the overlap width between the first signal line 21 and the sub-pixel opening V in the first direction X. However, this disclosure uses... Figure 2a The structure has a sub-pixel opening V with dimensions of 45μm × 125μm. Once the sub-pixel opening V moves along the first direction X, the overlapping area of ​​the sub-pixel opening V and the first signal line 21 projected onto the substrate 1 is 45μm × H × 2, where the number 2 indicates that there are two light-emitting devices in one pixel unit 100 along the second direction Y. 90μm × H is smaller than 125μm × H. Therefore, compared to related technologies, this disclosure reduces the overlap area between the opening region VV of the light-emitting device and the first signal line 21 to a certain extent, thus increasing the effective light-emitting area of ​​the light-emitting device to a certain extent, thereby mitigating the Mura phenomenon (scratching).

[0058] In some embodiments, Figure 3a This is a schematic diagram of an exemplary light-emitting layer located in the opening region of a light-emitting device, provided as an embodiment of this disclosure. Figure 3bA schematic diagram of another exemplary light-emitting layer located in the opening region of a light-emitting device, as provided in this disclosure embodiment, is shown below. Figure 3a and Figure 3b As shown, the light-emitting device includes a light-emitting layer 3. The light-emitting layer 3 located in the opening region VV of the light-emitting device includes a main body portion 31 and a protrusion 32 disposed on at least one side of the main body portion 31 in the first direction X.

[0059] For example, such as Figure 3a and Figure 3b As shown, the light-emitting layer 3 located in the opening region VV of the light-emitting device includes a main body 31 and protrusions 32-1 and 32-2 disposed on two opposite sides of the main body 31 along the first direction X.

[0060] This embodiment does not limit the specific position of the protrusion 32 on the side of the main body 31.

[0061] The outline shape of the orthographic projection of the protrusion 32 onto the substrate 1 can be, for example, rectangular, such as... Figure 3a As shown; or, the outline shape of the orthographic projection of the protrusion 32 onto the substrate 1 can be, for example, a triangle, such as... Figure 3b As shown.

[0062] For example, the outline shape of the orthogonal projection of the sub-pixel opening V onto the substrate is the same as the outline shape of the orthogonal projection of the light-emitting layer 3 located at the sub-pixel opening V onto the substrate.

[0063] Of course, the specific shape of the protrusion 32 is not limited in the present embodiment. Other irregular structures can also be selected, as long as the protrusion 32-1 and the protrusion 23-2 are provided on the two sides of the main body 31 that are opposite to each other along the first direction X, and have a certain length in the first direction X.

[0064] In some embodiments, such as Figure 3a and Figure 3b As shown, the protrusion 32 and the main body 31 are integrally formed.

[0065] The main body 31 and the protrusion 32 are integrally formed during the manufacturing process, reducing the complexity of the process.

[0066] It is understandable that the irregular structure formed by the protrusion 32 and the main body 31 corresponds to the irregular structure of the sub-pixel opening V in the opening region VV of the light-emitting device. The shape and size of the sub-pixel opening V on the substrate 1 are the same as the shape and size of the irregular structure formed by the protrusion 32 and the main body 31 in the opening region VV.

[0067] In some embodiments, the ratio of the dimensions of the protrusion 32 and the main body 31 in the first direction X is between 0.01 and 0.3; and / or, the ratio of the dimensions of the protrusion 32 and the main body 31 in the second direction Y is between 0.01 and 0.5.

[0068] For example, the ratio of the dimensions of the protrusion 32 and the main body 31 in the first direction X is 0.1, 0.2 or 0.3.

[0069] For example, the ratio of the dimensions of the protrusion 32 and the main body 31 in the second direction Y is 0.1, 0.2, 0.3, 0.4 or 0.5.

[0070] As in the above embodiments Figure 3a or Figure 3b As shown in the embodiment, this disclosure adds a protrusion 32 to the main body 31. This protrusion 32, which is relatively small compared to the main body 31, acts as a buffer structure to prevent overlap with the projection of the first signal line 21 after repeated exposure fluctuations. This further reduces the overlap area between the light-emitting layer 3 in the opening region VV of the light-emitting device and the first signal line 21, thereby further reducing the splicing mura effect. Simultaneously, the effective light-emitting area of ​​the main body 31 is not lost, ensuring stable light extraction efficiency.

[0071] In some embodiments, Figure 4 A schematic diagram of the first signal line provided in an embodiment of this disclosure, as shown below. Figure 4 As shown, the first signal line 21 includes a first main line segment 211 and a second main line segment 212, and a transition line segment 213 connecting the first main line segment 211 and the second main line segment 212; the first main line segment 211 and the second main line segment 212 are parallel to each other and have different extension directions from the transition line segment 213.

[0072] like Figure 4 As shown, the angle α between the center extension line L3 of the orthographic projection of the adapter segment 213 on the substrate 1 and the center extension lines L1 and L2 of the orthographic projection of the second main body segment 212 on the substrate 1 is related to the spacing between the light-emitting devices corresponding to the first main body segment 211 and the second main body segment 212 in the first direction X; the larger the spacing, the smaller the angle; conversely, the smaller the spacing, the larger the angle.

[0073] For example, such as Figure 4 As shown, the width of the first main body line segment 211 in the first direction X is equal to the width of the second main body line segment 212 in the first direction X.

[0074] For example, such as Figure 4As shown, the line width W3 of the adapter segment 213, the width W1 of the first main body segment 211 in the first direction X, and the width W2 of the second main body segment 212 in the first direction X are all equal.

[0075] Figure 5 A schematic diagram of another exemplary display panel provided for an embodiment of this disclosure, such as... Figure 5 As shown, for any pixel unit 100, the first light-emitting device R and the second light-emitting device G are both correspondingly arranged with the first main body line segment 211 in the first direction X, and the third light-emitting device B and the fourth light-emitting device W are both correspondingly arranged with the second main body line segment 212 in the first direction X; the shortest distance s1 from the orthographic projection of the first main body line segment 211 on the substrate 1 to the orthographic projection of the opening area VV of the first light-emitting device R on the substrate 1 is equal to the shortest distance s2 from the orthographic projection of the second main body line segment 212 on the substrate 1 to the orthographic projection of the opening area VV of the third light-emitting device B on the substrate 1; the shortest distance s3 from the orthographic projection of the first main body line segment 211 on the substrate 1 to the orthographic projection of the opening area VV of the second light-emitting device G on the substrate 1 is equal to the shortest distance s4 from the orthographic projection of the second main body line segment 212 on the substrate 1 to the orthographic projection of the opening area VV of the fourth light-emitting device W on the substrate 1.

[0076] For example, such as Figure 5 As shown, the sub-pixel opening V of the opening region VV of the first light-emitting device R has a first side B1 and a second side B2 arranged opposite to each other along the second direction Y, and the sub-pixel opening V of the opening region VV of the third light-emitting device B has a third side B3 and a fourth side B4 arranged opposite to each other along the second direction Y; wherein, the orthographic projection of the transition segment 213 on the substrate 1 is located between the orthographic projections of the extension lines of the second side and the third side along the first direction X on the substrate 1. Alternatively, the sub-pixel opening V of the opening region VV of the second light-emitting device G has a first side and a second side arranged opposite to each other along the second direction Y, and the sub-pixel opening V of the opening region VV of the fourth light-emitting device W has a third side and a fourth side arranged opposite to each other along the second direction Y; wherein, the orthographic projection of the transition segment 213 on the substrate 1 is located between the orthographic projections of the extension lines of the second side and the third side along the first direction X on the substrate 1.

[0077] In some embodiments, such as Figure 4 As shown, the first main body segment 211 includes a first side C1 and a second side C2 arranged opposite to each other along the second direction Y; the second main body segment 212 includes a third side C3 and a fourth side C4 arranged opposite to each other along the second direction Y; the extension line of the orthographic projection of the second side C2 onto the substrate 1 is collinear with the extension line of the orthographic projection of the third side C3 onto the substrate 1.

[0078] In some embodiments, such as Figure 2b As shown, the display panel also includes a pixel defining layer PDL disposed on the side of the source / drain conductive layer 2 away from the substrate 1; the pixel defining layer PDL has a sub-pixel opening V, the sub-pixel opening V is located in the opening region VV of the light-emitting device, and different sub-pixel openings V are located in the opening regions VV of different light-emitting devices; the light-emitting layer 3 of the light-emitting device at least covers the sub-pixel opening V.

[0079] The pixel defining layer PDL has at least one groove 4 on the surface near the substrate 1 and / or the surface away from the substrate 1, and a protrusion defining the groove 4. Figure 2b The diagram only shows the case where the pixel limiting layer PDL has a groove 4 on the surface away from the substrate 1. The groove 4 can be used to change the reflection path of the light emitted by the light-emitting device, thereby preventing light leakage between adjacent light-emitting devices.

[0080] For example, such as Figure 2b As shown, the light-emitting layer 3 of the light-emitting device is located inside the sub-pixel opening V.

[0081] It should be noted that the specific width and depth of the groove 4 can be set according to the actual light leakage prevention effect, and this embodiment does not impose specific limitations.

[0082] In some embodiments, such as Figure 5 As shown, the extension direction of the first main body segment 211 and the second main body segment 212 is the same as the extension direction of the groove 4, that is, they all extend along the second direction Y; the widths of the first main body segment 211, the second main body segment 212 and the groove 4 in the first direction X are all equal.

[0083] It should be noted that the so-called equal width in this disclosure refers to equality within a certain range of process error, and the specific dimensions are not limited.

[0084] In some embodiments, such as Figure 2b As shown, the extension direction of the groove 4 is the same as the extension direction of the first signal line 21.

[0085] In some embodiments, the display panel includes a plurality of pixel units 100; each pixel unit 100 includes a plurality of sub-pixel units of different colors; each sub-pixel unit includes a light-emitting device and a pixel driving circuit for driving the light-emitting device. All sub-pixel units in the display panel are divided into multiple groups of sub-pixel units arranged side by side along a second direction Y, and each group of sub-pixel units includes a plurality of sub-pixel units arranged side by side along a first direction X.

[0086] In the first direction X, there is one or more orthogonal projections of the subpixel openings V of two adjacent subpixel units 100 onto the substrate 1. For example, in the first direction X, there are multiple orthogonal projections of the subpixel openings V of two adjacent subpixel units 100 onto the substrate 1, wherein the multiple first signal lines 21 are, for example, data lines and power signal lines; or, the multiple first signal lines 21 are, for example, data lines, power signal lines and detection signal lines, etc.

[0087] Figure 6 A schematic diagram illustrating an exemplary first signal line and groove distribution provided in an embodiment of this disclosure, as shown below. Figure 6 As shown, in conjunction with the above-described embodiments regarding the definition of the first signal line 21, further, for two adjacent first signal lines 21 whose orthogonal projection on the substrate 1 is located between the orthogonal projections of two adjacent sub-pixel openings V on the substrate 1, wherein the orthogonal projection of the groove 4 on the substrate 1 is located between the extension line R1 of the orthogonal projection of the first side C1-1 of the first main body segment 211 of the first first signal line 21-1 on the substrate 1 and the extension line R2 of the orthogonal projection of the fourth side C4-2 of the second main body segment 212 of the second first signal line 21-2 on the substrate 1.

[0088] Continue as Figure 6 As shown, for two adjacent first signal lines 21 whose orthogonal projections on the substrate 1 are located between the orthogonal projections of two adjacent sub-pixel openings V on the substrate 1, the first distance T1 between the orthogonal projections of the second side C2-1 of the first main body segment 211 of the first first signal line 21-1 and the first side C1-2 of the first main body segment 211 of the second first signal line 21-2 on the substrate 1 is equal to the second distance T2 between the orthogonal projections of the fourth side C4-1 of the second main body segment 212 of the first first signal line 21-1 and the third side C3-2 of the second main body segment 212 of the second first signal line 21-2 on the substrate 1, and is equal to the width of the groove 4 in the first direction X.

[0089] Thus, when the groove 4 moves along the first direction X and does not exceed the maximum area of ​​the two first signal lines 21 in the first direction X, the sum of the first overlapping areas of the second main body line segment 212 in the first first signal line 21-1 and the first main body line segment 211 in the second first signal line 21-2 on the substrate 1 and the first overlapping area of ​​the groove 4 on the substrate 1 is a fixed value.

[0090] For example, when the lengths of the first main body line segment 211 and the second main body line segment 212 are the same, the fixed value is the overlap area when the first main body line segment 211 and the groove 4 are completely overlapped in the first direction X on the substrate 1.

[0091] When repeated exposure causes a slight translation of the groove 4 in the first direction X, the sum of the overlapping areas of the groove 4, the first main body line segment 211, and the second main body line segment 212 on the substrate 1 remains unchanged, thus keeping the reflective intensity of the pixel-defining layer (PDL) constant. In other words, the offset of the groove 4 does not affect the reflective intensity of the PDL, solving the problem of different reflective intensities caused by repeated exposure, thereby improving the splicing Mura phenomenon and increasing product yield.

[0092] In some embodiments, Figure 7 A schematic diagram of another exemplary first signal line and groove distribution provided in this disclosure embodiment, as shown below. Figure 7 As shown, the orthographic projection of the groove 4 onto the substrate 1 is located between the extension line R3 of the orthographic projection of the first side C1 of the first main body segment 211 of the first signal line 21 onto the substrate 1 and the extension line R4 of the orthographic projection of the fourth side C4 of the second main body segment 212 onto the substrate 1. Furthermore, the widths of the first main body segment 211, the second main body segment 212, and the groove 4 are all equal in the first direction X.

[0093] Thus, when the groove 4 moves along the first direction X and does not exceed the maximum area of ​​the first signal line 21 in the first direction X, the sum of the second overlapping area of ​​the first main line segment 211 and the second main line segment 212 in the first signal line 21 on the substrate 1 and the second overlapping area of ​​the groove 4 on the substrate 1 is a fixed value.

[0094] For example, when the lengths of the first main body line segment 211 and the second main body line segment 212 are the same, the fixed value is the overlap area when the first main body line segment 211 and the groove 4 are completely overlapped in the first direction X on the substrate 1.

[0095] When repeated exposure causes a slight translation of the groove 4 in the first direction X, the sum of the overlapping areas of the groove 4 and the first main line segment 211 and the second main line segment 212 in the first signal line 21 on the substrate 1 remains unchanged, thus the reflective intensity of the pixel-defining layer (PDL) remains unchanged. In other words, the offset of the groove 4 does not affect the reflective intensity of the pixel-defining layer (PDL), solving the problem of different reflective intensities caused by repeated exposure, thereby improving the splicing Mura phenomenon and increasing product yield.

[0096] The above is a complete description of the display panel structure provided in the embodiments of this disclosure.

[0097] In addition, this disclosure also provides a splicing display screen, which includes a plurality of spliced ​​display panels as described in the above embodiments and combinations thereof; the splicing gap of the spliced ​​display panels extends in the second direction Y.

[0098] The splicing display provided in this disclosure, utilizing the display panel formed by the above embodiments and their combinations, can completely solve the problem of splicing mura caused by splicing exposure of large-size display panels in practical applications, improve the display effect of large-size splicing display, and increase the yield of large-size splicing display.

[0099] In addition, this disclosure also provides a display device, which includes the video wall display described in the above embodiments. This display device can be used as a liquid crystal display for conference rooms, a billboard for commercial use, or a video wall, etc.

[0100] Other essential components of the display device are those which should be understood by those skilled in the art, and will not be described in detail here, nor should they be construed as limiting the present disclosure.

[0101] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of this disclosure, and this disclosure is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and substance of this disclosure, and these modifications and improvements are also considered to be within the scope of protection of this disclosure.

Claims

1. A display panel comprising a substrate, a first signal line and a pixel unit disposed on the substrate; the pixel unit comprising a plurality of light-emitting devices of different colors; wherein, The display panel further includes a source / drain conductive layer located on the substrate, the first signal line is located on the source / drain conductive layer, and the light-emitting device is located on the side of the source / drain conductive layer away from the substrate. The first signal line extends along the second direction, and the size of the opening area of ​​the light-emitting device in the second direction is smaller than the size in the first direction, and the first direction intersects the second direction; The first signal line includes a first main body segment and a second main body segment, as well as a transition segment connecting the first main body segment and the second main body segment; The first main line segment and the second main line segment are parallel to each other and have different extension directions from the transition line segment.

2. The display panel according to claim 1, wherein, The plurality of light-emitting devices of different colors include a first light-emitting device, a second light-emitting device, a third light-emitting device, and a fourth light-emitting device; For any pixel unit, the first light-emitting device and the third light-emitting device are arranged opposite each other along the second direction, and the second light-emitting device and the fourth light-emitting device are arranged opposite each other along the second direction; the first light-emitting device and the second light-emitting device are arranged opposite each other along the first direction, and the third light-emitting device and the fourth light-emitting device are arranged opposite each other along the first direction.

3. The display panel according to claim 1, wherein, The light-emitting device includes a light-emitting layer, and the light-emitting layer located in the opening area of ​​the light-emitting device includes a main body and a protrusion disposed on at least one side of the main body in the first direction.

4. The display panel according to claim 3, wherein, The protrusion and the main body are integrally formed.

5. The display panel according to claim 3, wherein, The ratio of the dimensions of the protrusion and the main body in the first direction is between 0.01 and 0.3; and / or, The ratio of the dimensions of the protrusion and the main body in the second direction is between 0.01 and 0.

5.

6. The display panel according to claim 2, wherein, For any pixel unit, the first light-emitting device and the second light-emitting device are respectively disposed corresponding to the first main body line segment, and the third light-emitting device and the fourth light-emitting device are respectively disposed corresponding to the second main body line segment; the shortest distance from the orthographic projection of the first main body line segment on the substrate to the orthographic projection of the opening area of ​​the first light-emitting device on the substrate is equal to the shortest distance from the orthographic projection of the second main body line segment on the substrate to the orthographic projection of the opening area of ​​the third light-emitting device on the substrate; the shortest distance from the orthographic projection of the first main body line segment on the substrate to the orthographic projection of the opening area of ​​the second light-emitting device on the substrate is equal to the shortest distance from the orthographic projection of the second main body line segment on the substrate to the orthographic projection of the opening area of ​​the fourth light-emitting device on the substrate.

7. The display panel according to claim 6, wherein, The first main body segment includes a first side and a second side arranged opposite to each other along the second direction; the second main body segment includes a third side and a fourth side arranged opposite to each other along the second direction; The extension line of the orthographic projection of the second side onto the substrate is collinear with the extension line of the orthographic projection of the third side onto the substrate.

8. The display panel according to claim 7, wherein, The display panel further includes a pixel defining layer disposed on the side of the source / drain conductive layer opposite to the substrate. The pixel defining layer has a sub-pixel opening, which is located in the opening area of ​​the light-emitting device; the light-emitting layer of the light-emitting device at least covers the sub-pixel opening. The pixel defining layer has at least one groove on the surface near the substrate and / or the surface away from the substrate and a protrusion defining the groove.

9. The display panel according to claim 8, wherein, The extension directions of the first main body segment and the second main body segment are the same as the extension direction of the groove; The widths of the first main body segment, the second main body segment, and the groove are all equal in the first direction.

10. The display panel according to claim 9, wherein, For two adjacent first signal lines whose orthographic projection on the substrate is located between the orthographic projections of two adjacent sub-pixel openings on the substrate, wherein the orthographic projection of the groove on the substrate is located between the extension line of the orthographic projection of the first side of the first main body segment of the first first signal line on the substrate and the extension line of the orthographic projection of the fourth side of the second main body segment of the second first signal line on the substrate. The first distance between the second side of the first main body segment of the first signal line and the first side of the first main body segment of the second signal line projected onto the substrate is equal to the second distance between the fourth side of the second main body segment of the first signal line and the third side of the second main body segment of the second signal line projected onto the substrate, and is equal to the width of the groove in the first direction.

11. The display panel according to claim 9, wherein, The orthographic projection of the groove on the substrate is located between the extension line of the orthographic projection of the first side of the first main body segment of the first signal line on the substrate and the extension line of the orthographic projection of the fourth side of the second main body segment on the substrate.

12. A splicing display screen, comprising a plurality of spliced ​​display panels as described in any one of claims 1 to 11; wherein the splicing gap between the spliced ​​display panels extends in the second direction.

13. A display device comprising the video wall display as described in claim 12.

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