A curved display panel and a display device

Abstract

The application relates to the technical field of display, and discloses a curved display panel and a display device. The curved display panel has a display area and a peripheral area surrounding the display area; the display panel comprises a substrate, a driving circuit layer located on one side of the substrate, and a display function layer located on the side of the driving circuit layer away from the substrate; wherein part of the display function layer located in the peripheral area is provided with at least one notch; part of the driving circuit layer located in the peripheral area comprises a signal line, and the orthogonal projection of the notch on the substrate does not overlap with the orthogonal projection of the signal line on the substrate. The edge stress of the curved display panel is reduced.

Description

Technical Field

[0001] This invention relates to the field of display technology, and in particular to a curved display panel and display device. Background Technology

[0002] With the development of science and technology, curved screens are becoming the trend in electronic device development. For example, watches have evolved from traditional mechanical watches to smartwatches, and people's demands for smartwatch technology are increasing. Currently, the display screens used in smartwatches are gradually shifting from rigid OLED (Organic Light-Emitting Diode) to flexible OLED (Organic Light-Emitting Diode). The advantage of flexible OLED screens is that they can achieve various forms, such as double-curved, quad-curved, and foldable designs.

[0003] Smartwatches are no longer satisfied with flat designs and are increasingly adopting spherical and curved shapes. However, when curved or fully curved surfaces are bonded together, it can easily cause excessive stress on the display module, leading to display module failure. Summary of the Invention

[0004] This invention discloses a curved display panel and a display device for reducing edge stress of the curved display panel.

[0005] To achieve the above objectives, the present invention provides the following technical solution: In a first aspect, a curved display panel, the display panel having a display area and a peripheral area surrounding the display area; the display panel includes: Substrate; A driving circuit layer is located on one side of the substrate. The display functional layer is located on the side of the driving circuit layer that is away from the substrate. The display function layer has at least one slot in the peripheral area; the driving circuit layer includes signal lines in the peripheral area, and the orthographic projection of the slot on the substrate does not overlap with the orthographic projection of the signal lines on the substrate.

[0006] The aforementioned display panel has a display area and a peripheral area surrounding the display area. The display panel includes a substrate, a driving circuit layer, and a display functional layer arranged sequentially from top to bottom. When the peripheral area of ​​the display functional layer is shaped, a corresponding portion is removed; that is, a slot is created in the peripheral area of ​​the display functional layer. The edges of the display functional layer are provided with slots to reduce edge stress. Slotting can reduce the edge stress generated by the display functional layer during curved or spherical bonding. The slots formed in the peripheral area of ​​the display functional layer contain some signal lines. To achieve the slotting of the display functional layer, these signal lines can be designed to avoid overlapping. The orthographic projection of the slot on the substrate does not overlap with the orthographic projection of the signal lines on the substrate; that is, the signal lines located at the slot are recessed and not placed at the slot. This method can minimize edge stress.

[0007] Optionally, the display function layer has a bent portion; The slots are all located on the side away from the bend.

[0008] Optionally, the signal line includes a first power line, a second power line, and a third power line; The second power line is recessed relative to the first power line and the third power line. The second power line is connected to the first power line to form a first connection end. The second power line is connected to the third power line to form a second connection end. The second connection end is grooved from the first connection end, the second power line to the second connection end.

[0009] Optionally, the width of the first power line is the same as the width of the third power line; The width of the first power line is smaller than the width of the second power line.

[0010] Optionally, the first power line includes: a first metal layer and a second metal layer; The first metal layer is located on one side of the substrate, and the second metal layer is located on the side of the first metal layer opposite to the substrate. The driving circuit layer includes a gate driving circuit, which is disposed on the same layer as the first metal layer.

[0011] Optionally, the second power line includes the second metal layer, and the orthographic projection of the second metal layer on the substrate is located at the orthographic projection of the gate driving circuit on the substrate.

[0012] Optionally, it may also include an isolation dam located in the surrounding area, the isolation dam being arranged around the display area.

[0013] Optionally, the isolation dam located in the area corresponding to the slot is recessed relative to the isolation dams in other areas; The orthographic projection of the isolation dam located in the area corresponding to the slot on the substrate does not overlap with the orthographic projection of the first power line on the substrate.

[0014] Optionally, the isolation dam includes a first isolation dam and a second isolation dam; Located in the area corresponding to the slot, the orthographic projections of the first isolation dam and the second isolation dam on the substrate do not overlap with the orthographic projection of the first power line on the substrate.

[0015] In a second aspect, the present invention provides a display device comprising: a flexible circuit board and a curved display panel as described in any one of the first aspects; The flexible circuit board is connected to the bent portion of the curved display panel. Attached Figure Description

[0016] Figure 1 A front view of the non-display surface of a display device provided in an embodiment of the present invention; Figure 2 For the corresponding Figure 1 A magnified view of a section at point A in the middle; Figure 3 For the corresponding Figure 1 A magnified view of a section at point B in the middle; Figure 4 A schematic diagram of the wiring of the driving circuit layer in the slot area of ​​the side opening of a display device provided in an embodiment of the present invention; Figure 5 For the corresponding Figure 4 A cross-sectional view of the YY position in the diagram; Figure 6 For the corresponding Figure 4 A sectional view of position XX in the diagram.

[0017] Icons: 100 - Display area; 200 - Surrounding area; 201 - Isolation zone; 1-Substrate; 2-Driving circuit layer; 21-Signal line; 211-First power line; 212-Second power line; 213-Third power line; d1-First power line width; d2-Second power line width; d3-Third power line width; 22-First metal layer; 23-Second metal layer; 24-Gate driving circuit; 25-First planarization layer; 26-Second planarization layer; 3-Display function layer; 31-Gate; 32-Bending portion; 33-Anode layer; 34-Pixel boundary layer; 35-Cathode; 4-Isolation dam; 41-First isolation dam; 42-Second isolation dam; 5-Encapsulation structure layer; 6-Flexible circuit board. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] like Figures 1 to 6 As shown, this embodiment of the invention provides a curved display panel, which has a display area 100 and a peripheral area 200 surrounding the display area 100; the display panel includes: Substrate 1; The driving circuit layer 2 is located on one side of the substrate 1; Display functional layer 3 is located on the side of driving circuit layer 2 away from substrate 1; The display functional layer 3 has at least one slot 31 in the peripheral area 200; the driving circuit layer 2 includes a signal line 21 in the peripheral area 200, and the orthographic projection of the slot 31 on the substrate 1 does not overlap with the orthographic projection of the signal line 21 on the substrate 1.

[0020] It should be noted that the aforementioned display panel has a display area 100 and a peripheral area 200 surrounding the display area 100; the aforementioned display panel includes a substrate 1, a driving circuit layer 2, and a display function layer 3 arranged sequentially from top to bottom. Here, "from top to bottom" refers to the thickness direction of the film layers, not necessarily... Figure 1 As indicated in the diagram, when the peripheral area 200 of the display functional layer 3 is shaped, a corresponding portion is removed. This means that a slot is created in the peripheral area 200 of the display functional layer 3, and the edge of the display functional layer 3 is provided with a groove 31 to reduce edge stress. The slotting reduces the edge stress generated by the display functional layer 3 during curved or spherical bonding. A groove 31 is formed in the peripheral area 200 of the display functional layer 3. A portion of the signal line 21 exists at the groove 31. To achieve the slotting of the display functional layer 3, this portion of the signal line 21 can be designed to avoid this portion. The orthographic projection of the groove 31 on the substrate 1 does not overlap with the orthographic projection of the signal line 21 on the substrate 1. In other words, the signal line 21 located at the groove 31 is recessed and not placed at the groove 31. This method minimizes edge stress.

[0021] like Figure 1 As shown, the lower part of the display functional layer 3 has a bent portion 32; the slots 31 are all located on the side away from the bent portion 32. Slots 31 are provided on the top, left, and right sides of the display device. Figure 1With the SS axis as the boundary and the SS axis as the center, a slot 31 is provided in the area upward of the SS axis. Multiple slots 31 are provided in the peripheral area 200 of the display function layer 3. For example, a slot 31 is provided in the upper part, and slots 31 are provided on the left and right sides.

[0022] Figure 2 This is a magnified view of the slotted area at point A. Because the bend 32 is located at the bottom of the display functional layer 3 and is bonded to the flexible circuit board 6, there are more signal lines 21 near the bend 32 in the display functional layer 3, while there are fewer signal lines 21 at the top of the display functional layer 3. Therefore, slotting can be designed for some film layers in the display functional layer 3 without considering the routing of the signal lines 21. However, slotting is not performed on the encapsulation structure layer 5 and the organic light-emitting structure layer in the display functional layer 3. The isolation dam 4 located in the peripheral area 200 is recessed inward into the display area 100 to leave an area for slotting. When performing the shape cutting process on some film layers in the display functional layer 3, the corresponding film layers in the slotted area are removed simultaneously. Slotting the display functional layer 3 can effectively reduce the stress generated at the edges after bonding curved or spherical surfaces.

[0023] Figure 3 This is a magnified view of the slotted area at point B. Figure 3 The enlarged view of the corresponding part of the slotted structure on the right side of the display functional layer 3 shows that since the bent portion 32 is located at the bottom of the display functional layer 3 and is bonded to the flexible circuit board 6, there are more signal lines 21 near the bent portion 32 in the display functional layer 3. The right and left sides of the display functional layer 3 have more signal lines 21 than the upper side. Therefore, a slotted design can be made for some film layers in the display functional layer 3, and the routing of the signal lines 21 also needs to be considered. For example, from... Figure 3 As can be seen, the isolation dam 4 is located in the surrounding area 200. When it is located at the slot on the right, the isolation dam 4 is recessed inward toward the display area 100, and the signal line 21 is also recessed inward.

[0024] To better understand the recessed design and structure of signal line 21, please refer to [reference needed]. Figure 4 The signal line 21 includes a first power line 211, a second power line 212, and a third power line 213. The second power line 212 is recessed relative to the first power line 211 and the third power line 213. The second power line 212 is connected to the first power line 211 to form a first connection end, and the second power line 212 is connected to the third power line 213 to form a second connection end. The second connection end is grooved from the first connection end, the second power line 212 to the second connection end.

[0025] Figure 4The GOA (Gate Driver On Array) 24, located at the first power line 211, is inside the first power line 211, meaning it's closer to the display area 100. Considering the routing of the signal line 21, the second power line 212, located at the right slot 31, is recessed inwards, meaning it's positioned above the GOA and doesn't occupy excessive space. The third power line 213, connected to the second power line 212, then loops around to the outside of the GOA, following the same routing position as the first power line 211.

[0026] For example, the width d1 of the first power line is the same as the width d3 of the third power line; the width d1 of the first power line is smaller than the width d2 of the second power line.

[0027] In some specific implementation methods, such as Figure 6 As shown in the figure, YY corresponds to the third power line 213. The first power line 211 and the third power line 213 have the same structure, only the power lines are at different positions. The first power line 211 includes: a first metal layer 22 and a second metal layer 23. The first metal layer 22 is located on one side of the substrate 1, and the second metal layer 23 is located on the side of the first metal layer 22 away from the substrate 1; the driving circuit layer 2 further includes: a gate driving circuit 24, which is disposed on the same layer as the first metal layer 22.

[0028] Similarly, the third power line 213 includes: a first metal layer 22 and a second metal layer 23; The first metal layer 22 is located on one side of the substrate 1, and the second metal layer 23 is located on the side of the first metal layer 22 away from the substrate 1; the driving circuit layer 2 further includes: a gate driving circuit 24, which is disposed on the same layer as the first metal layer 22.

[0029] by Figure 6 For example, in Figure 6The cross-sectional view of the structure at the YY region (without indentation) is divided into a display area 100 and a peripheral area 200, with an isolation dam area 201 located in the peripheral area 200. A gate driving circuit 24 and a first metal layer 22 are patterned on the substrate 1. A first planarization layer 25 is formed on the side of the gate driving circuit 24 and the first metal layer 22 away from the substrate 1. After etching the first planarization layer 25, a patterned second metal layer 23 is formed. The first metal layer 22 and the second metal layer 23 are connected as a third power line 213 (first power line 211). A second planarization layer 26 is formed on the side of the second metal layer 23 away from the substrate 1. After etching the second planarization layer 26, an anode layer 33 is deposited. A pixel defining layer 34 with an opening is formed on the side of the anode layer 33 away from the substrate 1, with the anode layer 33 exposed from the opening. A cathode layer 35 is formed on the side of the pixel defining layer 34 away from the anode layer 33. The first isolation dam 41 located in the isolation dam area 201 includes a second planarization layer 26, an anode layer 33, and a pixel defining layer 34 formed sequentially along the thickness direction of the substrate 1. The second isolation dam 42 includes a second planarization layer 26, an anode layer 33, and a pixel defining layer 34 formed sequentially along the thickness direction of the substrate 1.

[0030] like Figure 5 As shown, the second power line 212 includes a second metal layer 23, the orthographic projection of the second metal layer 23 on the substrate 1 being located at the orthographic projection of the gate driving circuit 24 on the substrate 1. It also includes an isolation dam 4 located in the peripheral region 200, the isolation dam 4 surrounding the display area 100. The isolation dam 4 located in the region corresponding to the slot 31 is recessed relative to the isolation dam 4 in other regions; the orthographic projection of the isolation dam 4 located in the region corresponding to the slot 31 on the substrate 1 does not overlap with the orthographic projection of the first power line 211 on the substrate 1. The isolation dam 4 includes a first isolation dam 41 and a second isolation dam 42; located in the region corresponding to the slot 31, the orthographic projections of the first isolation dam 41 and the second isolation dam 42 on the substrate 1 do not overlap with the orthographic projection of the first power line 211 on the substrate 1.

[0031] Continue to refer to Figure 5This is a cross-sectional view of the structure at the recessed part of XX, divided into a display area 100 and a peripheral area 200, with the isolation dam area 201 located in the peripheral area 200. A gate driving circuit 24 is patterned on the substrate 1. A first planarization layer 25 is formed on the side of the gate driving circuit 24 away from the substrate 1. After etching the first planarization layer 25, a patterned second metal layer 23 is formed. The second metal layer 23 is connected as a second power line 212. A second planarization layer 26 is formed on the side of the second metal layer 23 away from the substrate 1. After etching the second planarization layer 26, an anode layer 33 is deposited. A pixel defining layer 34 with an opening is formed on the side of the anode layer 33 away from the substrate 1, with the anode layer 33 exposed from the opening. A cathode layer 35 is formed on the side of the pixel defining layer 34 away from the anode layer 33. Here, the first isolation dam 41 located in the isolation dam area 201 includes the first planarization layer 25, the second planarization layer 26, the anode layer 33, and the pixel defining layer 34 formed sequentially along the thickness direction of the substrate 1. The second isolation dam 42 includes a first planarization layer 25, a second planarization layer 26, an anode layer 33, and a pixel defining layer 34 formed sequentially along the thickness direction of the substrate 1.

[0032] From the YY position to the inward XX position area, there is a second metal layer 23 as the VSS signal line 21. Therefore, the connection from the first power line 211 to the second power line 212, and then to the connection between the second power line 212 and the third power line 213, can be made without drilling.

[0033] On the other hand, an embodiment of the present invention provides a display device comprising: a flexible circuit board 6 and a curved display panel as described above; the flexible circuit board 6 is connected to the bent portion 32 of the curved display panel.

[0034] Obviously, those skilled in the art can make various modifications and variations to the embodiments of the present invention without departing from the spirit and scope of the invention. Therefore, if these modifications and variations fall within the scope of the claims of the present invention and their equivalents, the present invention also intends to include these modifications and variations.

Claims

1. A curved display panel, characterized in that, The display panel has a display area and a peripheral area surrounding the display area; the display panel includes: Substrate; A driving circuit layer is located on one side of the substrate. The display functional layer is located on the side of the driving circuit layer that is away from the substrate. The display function layer has at least one slot in the peripheral area; the driving circuit layer includes signal lines in the peripheral area; the orthographic projection of the slot on the substrate does not overlap with the orthographic projection of the signal lines on the substrate; the signal lines located at the slot are recessed. The display function layer has a bent portion; the slots are all located on the side away from the bent portion.

2. The curved display panel according to claim 1, characterized in that, The signal lines include a first power line, a second power line, and a third power line; The second power line is recessed relative to the first power line and the third power line. The second power line is connected to the first power line to form a first connection end. The second power line is connected to the third power line to form a second connection end, which is grooved from the first connection end, the second power line to the second connection end.

3. The curved display panel according to claim 2, characterized in that, The width of the first power line is the same as the width of the third power line; The width of the first power line is smaller than the width of the second power line.

4. The curved display panel according to claim 3, characterized in that, The first power line includes: a first metal layer and a second metal layer; The first metal layer is located on one side of the substrate, and the second metal layer is located on the side of the first metal layer opposite to the substrate. The driving circuit layer further includes a gate driving circuit, which is disposed on the same layer as the first metal layer.

5. The curved display panel according to claim 4, characterized in that, The second power line includes the second metal layer, and the orthographic projection of the second metal layer on the substrate is located at the orthographic projection of the gate driving circuit on the substrate.

6. The curved display panel according to claim 2, characterized in that, It also includes an isolation dam located in the surrounding area, the isolation dam being arranged around the display area.

7. The curved display panel according to claim 6, characterized in that, The isolation dam located in the area corresponding to the slot is recessed relative to the isolation dams in other areas; The orthographic projection of the isolation dam located in the area corresponding to the slot on the substrate does not overlap with the orthographic projection of the first power line on the substrate.

8. The curved display panel according to claim 7, characterized in that, The isolation dam includes a first isolation dam and a second isolation dam; Located in the area corresponding to the slot, the orthographic projections of the first isolation dam and the second isolation dam on the substrate do not overlap with the orthographic projection of the first power line on the substrate.

9. A display device, characterized in that, include: Flexible circuit board and curved display panel as described in any one of claims 1-8; The flexible circuit board is connected to the bent portion of the curved display panel.

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