Display panel, spliced display device, brightness compensation method and display method

Abstract

The application provides a display panel, a spliced display device, a brightness compensation method and a display method, which comprises a driving backboard and a pixel layer arranged on the driving backboard; the driving backboard comprises a middle pixel area, an edge pixel area and a splicing seam area, the edge pixel area is located between the middle pixel area and the splicing seam area, and the splicing seam area is located between the edge pixel area and an edge splicing line of the display panel; the pixel layer comprises a plurality of pixel units, the plurality of pixel units comprise first pixel units located in the middle pixel area and second pixel units located in the edge pixel area; and the display panel further comprises a pad inclined layer, the pad inclined layer is located between the driving backboard and the second pixel units, and a surface of the pad inclined layer towards the second pixel units is inclined to the splicing seam area, so that light emitted by the second pixel units is inclined to the splicing seam area.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a display panel, a splicing display device, a brightness compensation method, and a display method. Background Technology

[0002] The demand for large or extra-large screen display devices is increasing. Large or extra-large screens are greatly limited by the hardware constraints of production equipment; from an economic and reliability perspective, they can be achieved by splicing screens together.

[0003] However, the seams at the edges of video wall displays are often less bright due to the non-light-emitting areas at the edges of the display panels, thus affecting the display effect. Furthermore, the width of the seams in video wall displays is usually greater than the width of the gaps between the pixel units of the display panel, causing visibility issues with the seams and further impacting the display quality. Summary of the Invention

[0004] This invention provides a display panel, a splicing display device, a brightness compensation method, and a display method to solve the problem of low brightness and visible splicing seams at the splicing seams of existing splicing display devices, which affects the display effect.

[0005] To solve the above-mentioned technical problems, the present invention is implemented as follows:

[0006] In a first aspect, embodiments of the present invention provide a display panel, comprising:

[0007] A driving backplane and a pixel layer disposed on the driving backplane;

[0008] The driving back panel includes: a central pixel area, an edge pixel area, and a splicing seam area. The edge pixel area is located between the central pixel area and the splicing seam area, and the splicing seam area is located between the edge pixel area and the edge splicing line of the display panel.

[0009] The pixel layer includes a plurality of pixel units, the plurality of pixel units including a first pixel unit located in the central pixel region and a second pixel unit located in the edge pixel region;

[0010] The display panel further includes a sloping layer, which is located between the driving backplate and the second pixel unit, and the sloping layer is inclined toward the splicing seam area on the surface of the second pixel unit.

[0011] Optionally, the edge pixel region includes n1 columns of the second pixel units, where n1 takes the value of 1 to 10.

[0012] Optionally, the size of the tilt angle formed between the surface of the pad inclined layer facing the second pixel unit and the plane where the driving back plate is located is determined by the width of the splicing seam area in the first direction, and the first direction is perpendicular to the direction where the edge splicing line is located.

[0013] Optionally, the tilt angle satisfies the following formula:

[0014]

[0015] Wherein, L1 is the relative brightness of the seam area relative to the central pixel area, B is the width of the pixel unit in the first direction, a is the width of the seam area in the first direction, θ is the tilt angle, and the first direction is perpendicular to the direction of the edge seam line.

[0016] Optionally, the value of L1 is between 0.8 and 1.2, and the tilt angle is between 44.5°.

[0017] Between 61.8° and 61.8°.

[0018] Optionally, the ratio of 2a to B is less than 1.6, and the pitch value is between 800 and 1000 μm, where pitch = B + b, and b is the gap between adjacent pixel units in the first direction.

[0019] Optionally, the sloping pad layer includes at least one organic layer, at least one inorganic layer, and / or at least one metal layer.

[0020] Optionally, the padding layer includes multiple metal layers, the number of metal layers being related to the width of the pixel unit in the first direction, and the number of metal layers n2 = tanθ*B / c, where B is the width of the pixel unit in the first direction, c is the thickness of one metal layer, and the first direction is perpendicular to the direction where the edge splicing line is located.

[0021] Optionally, the inclined pad layer includes multiple organic layers, the number of organic layers being related to the width of the pixel unit in the first direction, the number of organic layers n3 = tanθ*B / e, where B is the width of the pixel unit in the first direction, e is the thickness of one organic layer, and the first direction is perpendicular to the direction where the edge splicing line is located.

[0022] Secondly, embodiments of the present invention provide a splicing display device, comprising at least two display panels as described in the first aspect above.

[0023] Thirdly, embodiments of the present invention provide a brightness compensation method applied to a splicing display device as described in the second aspect above, the splicing display device comprising at least two display panels, the method comprising:

[0024] Shooting steps: Capture the optical image of the brightness test screen displayed on the splicing display device;

[0025] Calculation steps: Determine the brightness difference between the splicing seam area and the central pixel area of ​​the display panel in the optical image;

[0026] Judgment step: Determine whether the brightness difference value is within the preset threshold range;

[0027] Compensation step: When the brightness difference value is not within the preset threshold range, current compensation is performed on the second pixel unit of the edge splicing pixel area of ​​the display panel according to the brightness difference value;

[0028] Recording steps: Repeat the shooting step, the calculation step, the compensation step and the judgment step until the brightness difference between the splicing seam area and the central pixel area of ​​the display panel in the optical image is within the preset threshold range, and record the current compensation value.

[0029] Fourthly, embodiments of the present invention provide a display method applied to a splicing display device as described in the second aspect above, the splicing display device comprising at least two display panels, the method comprising:

[0030] Get the image to be displayed;

[0031] Obtain the current compensation value of the second pixel unit in the edge splicing pixel area of ​​the display panel, perform brightness compensation on the image to be displayed based on the current compensation value, and display the brightness-compensated image to be displayed.

[0032] In this embodiment of the invention, a sloping layer is provided below the second pixel unit in the edge pixel area of ​​the display panel. The sloping layer is inclined toward the splicing seam area from the surface of the second pixel unit, so that the light emitted by the second pixel unit is inclined toward the splicing seam area, thereby improving the brightness of the splicing seam area, improving the brightness uniformity of the display panel, and improving the brightness of the splicing seam area. It can also avoid the splicing line from being visible, thus improving the display effect of the splicing device composed of multiple display panels. Attached Figure Description

[0033] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0034] Figure 1 This is a top view of two display panels spliced ​​together in a related technology;

[0035] Figure 2 This is a schematic diagram of the grid lines formed by splicing lines on a splicing display device in related technologies.

[0036] Figure 3 This is a top view of the display panel according to an embodiment of the present invention;

[0037] Figure 4 This is a schematic diagram of two display panels joined together.

[0038] Figure 5 for Figure 4 A sectional view at point A-A' in the diagram;

[0039] Figure 6 This is a cross-sectional view of the display panel according to an embodiment of the present invention;

[0040] Figure 7 This is a schematic diagram of two display panels joined together.

[0041] Figure 8 for Figure 7 A sectional view at point B-B' in the diagram;

[0042] Figure 9 This is a schematic diagram of the tilt angle formed between the surface of the inclined pad layer facing the second pixel unit and the plane where the driving back plate is located, according to an embodiment of the present invention.

[0043] Figure 10 This is one of the structural schematic diagrams of the inclined pad layer according to an embodiment of the present invention;

[0044] Figure 11 This is a second schematic diagram of the structure of the inclined pad layer according to an embodiment of the present invention;

[0045] Figure 12 This is a schematic diagram showing the brightness simulation results of a splicing display device in related technologies;

[0046] Figure 13 This is a schematic diagram showing the brightness simulation results of the splicing display device in an embodiment of the present invention;

[0047] Figure 14 This is a schematic flowchart of the brightness compensation method according to an embodiment of the present invention;

[0048] Figure 15 This is a flowchart illustrating the display method according to an embodiment of the present invention. Detailed Implementation

[0049] 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, not all, of the embodiments of the present invention. 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.

[0050] Please refer to Figure 1 In related technologies, the splicing device often has a splicing seam width 2a that is larger than the gap (gap) b between pixel units on the display panel, causing splicing line visibility issues. Please refer to [the relevant documentation / reference]. Figure 2 , Figure 2 The splicing lines of multiple display panels in a splicing device form a grid, which affects the display effect of the splicing device.

[0051] To solve the above problems, please refer to... Figure 3 , Figure 4 and Figure 5 , Figure 3 This is a top view of the display panel according to an embodiment of the present invention. Figure 4 This is a schematic diagram of two display panels joined together. Figure 5 for Figure 4 A cross-sectional view at A-A' in the figure. An embodiment of the present invention provides a display panel, including:

[0052] A driving backplate 10 and a pixel layer 20 disposed on the driving backplate 10;

[0053] The driving back panel 10 includes: a central pixel region A1, an edge pixel region A2, and a splicing seam region A3. The edge pixel region A2 is located between the central pixel region A1 and the splicing seam region A3, and the splicing seam region A3 is located between the edge pixel region A2 and the edge splicing line L of the display panel.

[0054] The pixel layer 20 includes a plurality of pixel units, the plurality of pixel units including a first pixel unit P1 located in the central pixel region A1 and a second pixel unit P2 located in the edge pixel region A2;

[0055] The display panel further includes a sloping layer 30, which is located between the driving backplate 10 and the second pixel unit P2, and the sloping layer 30 is inclined toward the splicing seam area A3 on the surface of the second pixel unit P2.

[0056] In this embodiment of the invention, optionally, the display panel may be an OLED (Organic Light-Emitting Diode) display panel; of course, other types of display panels are also not excluded.

[0057] In this embodiment of the invention, a sloping layer is provided below the second pixel unit in the edge pixel area of ​​the display panel. The sloping layer is inclined toward the splicing seam area from the surface of the second pixel unit, so that the light emitted by the second pixel unit is inclined toward the splicing seam area, thereby improving the brightness of the splicing seam area, improving the brightness uniformity of the display panel, and improving the brightness of the splicing seam area. It can also avoid the splicing line from being visible, thus improving the display effect of the splicing device composed of multiple display panels.

[0058] It should be noted that in this embodiment of the invention, a sloping layer 30 is provided below the second pixel unit P2 in the edge pixel region A2, while a sloping layer 30 is not provided below the first pixel unit P1 in the central pixel region A1. That is, a sloping layer 30 is provided only in the edge pixel region A2.

[0059] In this embodiment of the invention, the first pixel unit P1 and the second pixel unit P2 have the same size, so that the display effect will not be affected by the change in pixel size.

[0060] In this embodiment of the invention, optionally, the edge pixel region A2 may include n1 columns of the second pixel unit P2, where n1 takes the value of 1 to 10. Figure 4 In the embodiment shown, the edge pixel region A2 includes a column of the second pixel units P2. Figure 7 and Figure 8 In the embodiment shown, the edge pixel region A2 includes two columns of the second pixel units P2. Figure 7 This is a schematic diagram of two display panels joined together. Figure 8 for Figure 7 The sectional view at point B-B'.

[0061] In this embodiment of the invention, optional details may be found, please refer to [the relevant documentation]. Figure 9 The size of the tilt angle formed between the surface of the pad inclined layer facing the second pixel unit and the plane where the driving back plate is located is determined by the width of the splicing seam area in the first direction, and the first direction is perpendicular to the direction where the edge splicing line is located.

[0062] In this embodiment of the invention, optionally, the tilt angle satisfies the following formula:

[0063]

[0064] Wherein, L1 is the relative brightness of the seam area relative to the central pixel area, B is the width of the pixel unit in the first direction, a is the width of the seam area in the first direction, θ is the tilt angle, and the first direction is perpendicular to the direction of the edge seam line.

[0065] By ensuring that the tilt angle satisfies the above formula, the brightness of the splicing seam area can be increased, thereby improving the brightness uniformity of the display panel.

[0066] In some embodiments, optionally, the value of L1 is between 0.8 and 1.2, and the tilt angle is between 44.5° and 61.8°. This setting can ensure that the brightness uniformity of the splicing display device reaches more than 80%.

[0067] In some embodiments, optionally, the ratio of 2a to B is less than 1.6, and the pitch value is between 800 and 1000 μm, where pitch = B + b, and b is the gap between adjacent pixel units in the first direction. This setting avoids the problem of visible splicing lines. It should be noted that in this embodiment of the invention, the gaps between adjacent pixel units in the first direction on the display panel are all equal.

[0068] In some embodiments, the sloping pad 30 may optionally include at least one organic layer, at least one inorganic layer, and / or at least one metal layer.

[0069] In some embodiments, optionally, the padding layer 30 includes multiple metal layers, the number of metal layers being related to the width of the pixel unit in a first direction, the number of metal layers n2 = tanθ*B / c, where B is the width of the pixel unit in the first direction, c is the thickness of one metal layer, and the first direction is perpendicular to the direction where the edge splicing line is located.

[0070] In some embodiments, optionally, when forming a metal layer or an inorganic layer, the corresponding taper angle of the metal material or inorganic material after exposure and development is relatively large, which can form a relatively steep slope. When the tilt angle is required to be greater than 50°, the padding layer 30 can be at least one inorganic layer or at least one metal layer.

[0071] It should be noted that, please refer to Figure 10 In embodiments where the inclined layer 30 includes multiple metal layers or multiple inorganic layers, the multiple metal layers or inorganic layers form steps. The inclined layer 30 may also include an organic layer covering the multiple metal layers or inorganic layers, thereby forming a gentler slope.

[0072] In some embodiments, alternatively, please refer to Figure 11 The inclined pad layer 30 includes multiple organic layers. The number of organic layers is related to the width of the pixel unit in the first direction. The number of organic layers n3 = tanθ*B / e, where B is the width of the pixel unit in the first direction and e is the thickness of one organic layer. The first direction is perpendicular to the direction where the edge splicing line is located.

[0073] In some embodiments, optionally, the slope layer 30 may employ at least one organic layer when the required inclination angle is less than 50°, since the slope formed by the organic layer is relatively gentle.

[0074] In this embodiment of the invention, optionally, the driving backplane (BP) 10 may include a substrate and a driving circuit layer disposed on the substrate. The driving circuit layer may include thin-film transistors and capacitors, etc.

[0075] Please refer to Figure 6 The driving backplane 10 in this embodiment of the invention may include: a substrate 11 and a driving circuit layer. The driving circuit layer may include thin film transistors and capacitors, and may include the following film layers: a buffer layer 12, a semiconductor layer 13, a first gate insulating layer (GI1) 14, a first gate metal layer (Gate1) 15, a second gate insulating layer (GI2) 16, a second gate metal layer (Gate2) 17, an interlayer dielectric layer (ILD) 18, a source / drain metal layer (SD) 19, and a planarization layer (PLN) 110.

[0076] Optionally, the substrate 11 can be a flexible substrate, such as a PI (polyimide) substrate, or a rigid substrate, such as a glass substrate, with a thickness of 10-20 μm.

[0077] Optionally, the buffer layer 12 can be formed using SiNx / SiOx, with a thickness of 1000-1500 Å / 3000-4000 Å.

[0078] Optionally, the semiconductor layer 13 can be formed using P-Si (low-temperature polycrystalline silicon) with a thickness of 400-600 Å.

[0079] Optionally, the first gate insulating layer (GI1) 14 can be formed of SiO, and the thickness can be 1000-1500 Å.

[0080] Optionally, the second gate insulating layer (GI2) 16 can be formed of SiNx with a thickness of 1000-1500 Å.

[0081] Optionally, the interlayer dielectric layer (ILD) 18 can be formed of SiNx with a thickness of 1000-1500 Å.

[0082] Optionally, the thickness of the planarization layer (PLN) 110 can be 1-3 μm.

[0083] Optionally, the first gate metal layer (Gate1) 15 and the second gate metal layer (Gate2) 17 can be formed of a metal material such as Mo, and the thickness can be 2000-3000 Å.

[0084] Optionally, the source / drain metal layer (SD) 19 can be formed using Ti / Al / Ti with a thickness of 7000-8000 Å.

[0085] Please refer to Figure 6 In this embodiment of the invention, the pixel layer 20 may include: a pixel definition layer 21, an anode 22, a light-emitting layer 23, and a cathode 24. The pixel definition layer 21 is used to define a pixel area, and the anode 22, the light-emitting layer 23, and the cathode 24 constitute a pixel unit for emitting light. The overall thickness of the pixel unit can be between 1000-3000 Å.

[0086] Please refer to Figure 6 The display panel in this embodiment of the invention further includes an encapsulation layer 40, which may be a TFE (thin film) encapsulation layer, and may include a first inorganic layer (e.g., formed by CVD (chemical vapor deposition)), an organic layer (e.g., formed by IJP (inkjet printing)) and a second inorganic layer (e.g., formed by CVD), with thicknesses of 0.5-1.2μm / 8-20μm / 0.5-1.2μm, respectively.

[0087] This invention also provides a splicing display device, including at least two display panels, which are spliced ​​together to form the splicing display device, wherein the display panels are the display panels described in the above embodiments.

[0088] Please refer to Figure 12 and Figure 13 , Figure 12 This is a schematic diagram showing the brightness simulation results of a splicing display device in related technologies. Figure 13 This is a schematic diagram of the brightness simulation results of the splicing display device in an embodiment of the present invention. Figure 12 and Figure 13 It can be seen that the brightness of the splicing seam area in the splicing display device in the related technology is low, while the brightness of the splicing seam area in the splicing display device in the embodiment of the present invention is basically the same as the brightness of other areas. The embodiment of the present invention can effectively improve the problem of low brightness in the splicing seam area.

[0089] Please refer to Figure 14 This invention also provides a brightness compensation method applied to the above-mentioned splicing display device, the splicing display device including at least two display panels, the method comprising:

[0090] S1: Capture the optical image of the brightness test screen displayed on the splicing display device;

[0091] Calculation step S2: Determine the brightness difference between the splicing seam area and the central pixel area of ​​the display panel in the optical image;

[0092] Judgment step S3: Determine whether the brightness difference value is within the preset threshold range;

[0093] Compensation step S4: When the brightness difference value is not within the preset threshold range, current compensation is performed on the second pixel unit of the edge splicing pixel area of ​​the display panel according to the brightness difference value;

[0094] Record step S5: Repeat the shooting step, the calculation step, the compensation step and the judgment step until the brightness difference between the splicing seam area and the central pixel area of ​​the display panel in the optical image is within the preset threshold range, and record the current compensation value.

[0095] In this embodiment of the invention, the brightness difference between the splicing seam area and the central pixel area of ​​the display panel is determined by optical photography (i.e., the degree of insufficient brightness in the splicing seam area). By performing current compensation on the second pixel unit in the edge pixel area, the brightness of the splicing seam area is improved, thus alleviating the phenomenon of the splicing seam area being dark.

[0096] Please refer to Figure 15 This invention also provides a display method applied to the above-mentioned splicing display device, wherein the splicing display device includes at least two display panels, and the method includes:

[0097] Step S1': Obtain the image to be displayed;

[0098] Step S2': Obtain the current compensation value of the second pixel unit of the edge splicing pixel area of ​​the display panel, perform brightness compensation on the image to be displayed based on the current compensation value, and display the brightness-compensated image to be displayed.

[0099] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of the present invention.

Claims

1. A brightness compensation method, characterized in that, Applied to a video wall display device, the video wall display device comprising at least two display panels, the method includes: Shooting steps: Capture the optical image of the brightness test screen displayed on the splicing display device; Calculation steps: Determine the brightness difference between the splicing seam area and the central pixel area of ​​the display panel in the optical image; Judgment step: Determine whether the brightness difference value is within the preset threshold range; Compensation step: When the brightness difference value is not within the preset threshold range, current compensation is performed on the second pixel unit of the edge splicing pixel area of ​​the display panel according to the brightness difference value; Recording steps: Repeat the shooting step, the calculation step, the compensation step and the judgment step until the brightness difference between the splicing seam area and the central pixel area of ​​the display panel in the optical image is within the preset threshold range, and record the current compensation value.

2. A splicing display device for performing the brightness compensation method as described in claim 1, characterized in that, It includes at least two display panels.

3. A display method, characterized in that, Applied to the splicing display device as described in claim 2, the splicing display device comprising at least two display panels, the method comprising: Get the image to be displayed; Obtain the current compensation value of the second pixel unit in the edge splicing pixel area of ​​the display panel, perform brightness compensation on the image to be displayed based on the current compensation value, and display the brightness-compensated image to be displayed.

4. A display panel, wherein at least two of the display panels constitute the splicing display device as described in claim 2; characterized in that, include: A driving backplane and a pixel layer disposed on the driving backplane; The driving back panel includes: a central pixel area, an edge pixel area, and a splicing seam area. The edge pixel area is located between the central pixel area and the splicing seam area, and the splicing seam area is located between the edge pixel area and the edge splicing line of the display panel. The pixel layer includes a plurality of pixel units, the plurality of pixel units including a first pixel unit located in the central pixel region and a second pixel unit located in the edge pixel region; The display panel further includes a sloping layer, which is located between the driving backplate and the second pixel unit, and the sloping layer is inclined toward the splicing seam area on the surface of the second pixel unit.

5. The display panel as described in claim 4, characterized in that, The edge pixel region includes n1 columns of the second pixel units, where n1 takes values ​​from 1 to 10.

6. The display panel as described in claim 4, characterized in that, The size of the tilt angle formed between the surface of the pad inclined layer facing the second pixel unit and the plane where the driving back plate is located is determined by the width of the splicing seam area in a first direction, which is perpendicular to the direction where the edge splicing line is located.

7. The display panel as described in claim 6, characterized in that, The tilt angle satisfies the following formula: ； Wherein, L1 is the relative brightness of the seam area relative to the central pixel area, B is the width of the pixel unit in the first direction, and a is the width of the seam area in the first direction. The tilt angle is defined as follows: the first direction is perpendicular to the direction of the edge splicing line.

8. The display panel as described in claim 7, characterized in that, The value of L1 is between 0.8 and 1.2, and the tilt angle is between 44.5° and 61.8°.

9. The display panel as described in claim 7, characterized in that, The ratio of B to B is less than 1.6, and the pitch value is between 800 and 1000 μm, where pitch = B + b, and b is the gap between adjacent pixel units in the first direction.

10. The display panel as claimed in claim 4, characterized in that, The inclined pad layer includes at least one organic layer, at least one inorganic layer and / or at least one metal layer.

11. The display panel as claimed in claim 9, characterized in that, The inclined pad layer includes multiple metal layers. The number of metal layers is related to the width of the pixel unit in the first direction. The number of metal layers n2 = tanθ*B / c, where B is the width of the pixel unit in the first direction and c is the thickness of one metal layer. The first direction is perpendicular to the direction where the edge splicing line is located.

12. The display panel as claimed in claim 9, characterized in that, The inclined pad layer includes multiple organic layers. The number of organic layers is related to the width of the pixel unit in the first direction. The number of organic layers n3 = tanθ*B / e, where B is the width of the pixel unit in the first direction and e is the thickness of one organic layer. The first direction is perpendicular to the direction where the edge splicing line is located.

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