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

Abstract

The invention provides a display panel, a tiled display device, a brightness compensation method and a display method. The display panel 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, and the plurality of pixel units comprise a first pixel unit located in the middle pixel area and a second pixel unit located in the edge pixel area; the display panel further comprises a padding inclined layer, the padding inclined layer is located between the driving back plate and the second pixel unit, and the padding inclined layer inclines towards the splicing seam area towards the surface of the second pixel unit, so that light emitted by the second pixel unit inclines towards the splicing seam area.

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of display technology, and in particular to a display panel, a spliced ​​display device, a brightness compensation method, and a display method. Background Art

[0002] The demand for display devices with large or extra-large screens is increasing. Large or extra-large screens are greatly limited by the hardware of production equipment, and can be achieved by splicing screens from the perspective of economy and reliability.

[0003] However, the splicing seams of the spliced ​​screen are affected by the non-luminous area at the edge of the display panel, and the brightness is often low, thus affecting the display effect of the spliced ​​screen. In addition, since the width of the splicing seams of the spliced ​​screen is usually larger than the width of the gap between the pixel units of the display panel, the splicing line visibility problem is caused, further affecting the display effect of the spliced ​​screen. Summary of the invention

[0004] Embodiments of the present invention provide a display panel, a spliced ​​display device, a brightness compensation method and a display method, which are used to solve the problem that the brightness at the splicing seams of the existing splicing display devices is low and the splicing seams are visible, affecting the display effect.

[0005] In order to solve the above-mentioned technical problems, the present invention is achieved as follows:

[0006] In a first aspect, an embodiment of the present invention provides a display panel, including:

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

[0008] The driving backplane includes: a central pixel region, an edge pixel region and a splicing seam region, wherein the edge pixel region is located between the central pixel region and the splicing seam region, and the splicing seam region is located between the edge pixel region and an edge splicing line of the display panel;

[0009] The pixel layer includes a plurality of pixel units, and the plurality of pixel units include a first pixel unit located in the middle pixel area and a second pixel unit located in the edge pixel area;

[0010] The display panel further includes: a cushion layer, the cushion layer is located between the driving backplane and the second pixel unit, and a surface of the cushion layer facing the second pixel unit is inclined toward the joint seam area.

[0011] Optionally, the edge pixel area includes n1 columns of the second pixel units, and the value of n1 is 1-10.

[0012] Optionally, the size of the inclination angle formed between the surface of the cushion layer facing the second pixel unit and the plane where the driving backplane is located is determined by the width of the stitching seam area in the first direction, and the first direction is perpendicular to the direction where the edge stitching line is located.

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

[0014]

[0015] Among them, L1 is the relative brightness of the stitching seam area relative to the middle pixel area, B is the width of the pixel unit in the first direction, a is the width of the stitching seam area in the first direction, θ is the inclination angle, and the first direction is perpendicular to the direction of the edge stitching line.

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

[0017] ~61.8°.

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

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

[0020] Optionally, the cushion bevel 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, wherein B is the width of the pixel unit in the first direction, c is the thickness of one layer of the metal layer, and the first direction is perpendicular to the direction of the edge stitching line.

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

[0022] In a second aspect, an embodiment of the present invention provides a spliced ​​display device, comprising at least two display panels as described in the first aspect.

[0023] In a third aspect, an embodiment of the present invention provides a brightness compensation method, which is applied to the spliced ​​display device as described in the second aspect above, wherein the spliced ​​display device includes at least two display panels, and the method includes:

[0024] Shooting step: shooting an optical image when the spliced ​​display device displays a brightness test screen;

[0025] Calculation step: determining a brightness difference value between a joint seam area and a middle pixel area of ​​the display panel in the optical image;

[0026] Determination step: determining whether the brightness difference value is within a 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 stitching line pixel area of ​​the display panel according to the brightness difference value;

[0028] Recording step: repeatedly executing the shooting step, the calculating step, the compensating step and the judging step until the brightness difference between the seam area and the middle pixel area of ​​the display panel in the optical image is within a preset threshold range, and recording the current current compensation value.

[0029] In a fourth aspect, an embodiment of the present invention provides a display method, which is applied to the spliced ​​display device as described in the second aspect above, wherein the spliced ​​display device includes at least two display panels, and the method includes:

[0030] Get the image to be displayed;

[0031] The recorded current compensation value of the second pixel unit in the edge stitching line pixel area of ​​the display panel is obtained, brightness compensation is performed on the image to be displayed according to the current compensation value, and the image to be displayed after brightness compensation is displayed.

[0032] In an embodiment of the present invention, a cushioning layer is arranged under the second pixel unit in the edge pixel area of ​​the display panel, and the cushioning layer is inclined toward the splicing seam area on 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, and can also avoid the visibility of the splicing line, thereby improving the display effect of the splicing device composed of multiple display panels. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0034] Figure 1 A top view of two display panels spliced ​​together in the related art;

[0035] Figure 2 A schematic diagram of grid lines formed by splicing lines on a splicing display device in the related art;

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

[0037] Figure 4 A schematic diagram of two display panels spliced ​​together;

[0038] Figure 5 for Figure 4 A cross-sectional view at A-A' in FIG.

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

[0040] Figure 7 A schematic diagram of two display panels spliced ​​together;

[0041] Figure 8 for Figure 7 A cross-sectional view at BB' in FIG.

[0042] Fig. 9 It is a schematic diagram of the inclination angle formed between the surface of the cushioning layer facing the second pixel unit and the plane where the driving backplane is located according to an embodiment of the present invention;

[0043] Fig.10 This is one of the structural schematic diagrams of the cushioning layer of an embodiment of the present invention;

[0044] Fig.11 This is the second structural schematic diagram of the bevel cushion layer according to an embodiment of the present invention;

[0045] Fig.12 A schematic diagram of a brightness simulation result of a spliced ​​display device in the related art;

[0046] Fig.13 is a schematic diagram of a brightness simulation result of a spliced ​​display device in an embodiment of the present invention;

[0047] Fig.14 is a schematic flow chart of a brightness compensation method according to an embodiment of the present invention;

[0048] Fig.15 Schematic diagram of a flow chart of a display method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0049] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] Please refer to Figure 1 In the splicing device of the related art, the width 2a of the splicing seam is usually larger than the width of the gap b between the pixel units of the display panel, which causes the visibility problem of the splicing line. Please refer to Figure 2 , Figure 2 The splicing lines of the multiple display panels of the splicing device form grid lines, which affect 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 is a top view of a display panel according to an embodiment of the present invention, Figure 4 A schematic diagram of two display panels spliced ​​together. Figure 5 for Figure 4 The embodiment of the present invention provides a display panel, comprising:

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

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

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

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

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

[0057] In an embodiment of the present invention, a cushioning layer is arranged under the second pixel unit in the edge pixel area of ​​the display panel, and the cushioning layer is inclined toward the splicing seam area on 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, and can also avoid the visibility of the splicing line, thereby improving the display effect of the splicing device composed of multiple display panels.

[0058] It should be noted that in the embodiment of the present invention, a cushioning layer 30 is disposed under the second pixel unit P2 in the edge pixel region A2, while no cushioning layer 30 is disposed under the first pixel unit P1 in the middle pixel region A1. In other words, the cushioning layer 30 is only disposed in the edge pixel region A2.

[0059] In the embodiment of the present 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 of pixel size.

[0060] In the embodiment of the present invention, optionally, the edge pixel area A2 may include n1 columns of the second pixel units P2, and the value of n1 is 1-10. Figure 4 In the embodiment shown, the edge pixel area A2 includes a column of the second pixel units P2. Figure 7 and Figure 8 In the illustrated embodiment, the edge pixel area A2 includes two columns of the second pixel units P2. Figure 7 A schematic diagram of two display panels spliced ​​together. Figure 8 for Figure 7 Cross-sectional view at BB' in FIG.

[0061] In the embodiment of the present invention, it is optional, please refer to Fig. 9 The size of the inclination angle formed between the surface of the cushion layer facing the second pixel unit and the plane where the driving backplane 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 the embodiment of the present invention, optionally, the tilt angle satisfies the following formula:

[0063]

[0064] Among them, L1 is the relative brightness of the stitching seam area relative to the middle pixel area, B is the width of the pixel unit in the first direction, a is the width of the stitching seam area in the first direction, θ is the inclination angle, and the first direction is perpendicular to the direction of the edge stitching line.

[0065] By making the tilt angle satisfy the above formula, the brightness of the joint 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 inclination angle is between 44.5° and 61.8°. This setting can ensure that the brightness uniformity of the spliced ​​display device reaches more than 80%.

[0067] In some embodiments, optionally, the ratio of 2a to B is less than 1.6, and the value of pitch is between 800 and 1000 μm, wherein pitch = B + b, and b is the gap between the adjacent pixel units in the first direction. Through the above setting, the visibility problem of the stitching line can be avoided. It should be noted that in the embodiment of the present invention, the gaps between the adjacent pixel units in the first direction on the display panel are equal.

[0068] In some embodiments, optionally, the cushion layer 30 includes at least one organic layer, at least one inorganic layer and / or at least one metal layer.

[0069] In some embodiments, optionally, the cushion layer 30 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, wherein B is the width of the pixel unit in the first direction, c is the thickness of one layer of the metal layer, and the first direction is perpendicular to the direction of the edge stitching line.

[0070] In some embodiments, optionally, when a metal layer or an inorganic layer is formed, after the metal material or the inorganic material is exposed and developed, the corresponding taper angle is larger and a steeper slope can be formed. When the inclination angle is required to be greater than 50°, the cushion layer 30 can use at least one inorganic layer or at least one metal layer.

[0071] Please note that, please refer to Fig.10 In an embodiment where the bevel layer 30 includes multiple metal layers or multiple inorganic layers, the multiple metal layers or inorganic layers will form steps. The bevel layer 30 may also include an organic layer covering the multiple metal layers or inorganic layers to form a gentler slope.

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

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

[0074] In the embodiment of the present 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 a thin film transistor and a capacitor.

[0075] Please refer to Figure 6 The driving backplane 10 in the embodiment of the present invention may include: a substrate 11 and a driving circuit layer, the driving circuit layer may include thin film transistors and capacitors, etc., and may include the following film layers: a buffer layer (buffer) 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 base substrate 11 may be a flexible base substrate, such as a PI (polyimide) substrate, or a rigid base substrate, such as a glass substrate, and the thickness may be 10-20 μm.

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

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

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

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

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

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

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

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

[0085] Please refer to Figure 6 The pixel layer 20 in the embodiment of the present invention 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 the pixel area. 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 may be between 1000-3000A.

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

[0087] An embodiment of the present invention further provides a spliced ​​display device, comprising at least two display panels. The at least two display panels are spliced ​​to form the spliced ​​display device. The display panel is the display panel described in the above embodiment.

[0088] Please refer to Fig.12 and Fig.13 , Fig.12 is a schematic diagram of a brightness simulation result of a spliced ​​display device in the related art, Fig.13 is a schematic diagram of the brightness simulation result of the spliced ​​display device in the embodiment of the present invention, from Fig.12 and Fig.13 It can be seen that the brightness of the splicing seam area of ​​the splicing display device in the related art is low, while the brightness of the splicing seam area of ​​the splicing display device in the embodiment of the present invention is basically consistent with 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 Fig.14 The embodiment of the present invention further provides a brightness compensation method, which is applied to the above-mentioned splicing display device, wherein the splicing display device includes at least two display panels, and the method includes:

[0090] Shooting step S1: shooting an optical image when the spliced ​​display device displays a brightness test screen;

[0091] Calculation step S2: determining a brightness difference value between a joint seam area and a middle pixel area of ​​the display panel in the optical image;

[0092] Determination step S3: determining whether the brightness difference value is within a 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 stitching line pixel area of ​​the display panel according to the brightness difference value;

[0094] Recording step S5: Repeat the shooting step, the calculating step, the compensating step and the judging step until the brightness difference between the seam area and the middle pixel area of ​​the display panel in the optical image is within a preset threshold range, and record the current compensation value.

[0095] In an embodiment of the present invention, optical photography is used to determine the brightness difference between the seam area and the central pixel area of ​​the display panel (i.e., the degree of insufficient brightness in the seam area), and current compensation is performed on the second pixel unit in the edge pixel area to increase the brightness of the seam area and improve the darkening phenomenon of the seam area.

[0096] Please refer to Fig.15 The embodiment of the present invention further provides a display method, which is applied to the above-mentioned spliced ​​display device, wherein the spliced ​​display device includes at least two display panels, and the method includes:

[0097] Step S1': obtaining an image to be displayed;

[0098] Step S2 ′ obtains the recorded current compensation value of the second pixel unit in the edge stitching line pixel area of ​​the display panel, performs brightness compensation on the image to be displayed according to the current compensation value, and displays the brightness compensated image to be displayed.

[0099] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation modes, which are merely illustrative rather than restrictive. Under the guidance of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the present invention and the claims, all of which are within the protection of the present invention.

Claims

1. A display panel, characterized in that: include: A driving backplane and a pixel layer disposed on the driving backplane; The driving backplane includes: a central pixel region, an edge pixel region and a splicing seam region, wherein the edge pixel region is located between the central pixel region and the splicing seam region, and the splicing seam region is located between the edge pixel region and an edge splicing line of the display panel; The pixel layer includes a plurality of pixel units, and the plurality of pixel units include a first pixel unit located in the middle pixel area and a second pixel unit located in the edge pixel area; The display panel further includes: a cushion layer, the cushion layer is located between the driving backplane and the second pixel unit, and a surface of the cushion layer facing the second pixel unit is inclined toward the joint seam area.

2. The display panel according to claim 1, wherein: The edge pixel area includes n1 columns of the second pixel units, and the value of n1 is 1-10.

3. The display panel according to claim 1, wherein: The size of the inclination angle formed between the surface of the cushion layer facing the second pixel unit and the plane where the driving backplane is located is determined by the width of the joint seam area in the first direction, and the first direction is perpendicular to the direction where the edge joint line is located.

4. The display panel according to claim 3, wherein: The tilt angle satisfies the following formula: Among them, L1 is the relative brightness of the stitching seam area relative to the middle pixel area, B is the width of the pixel unit in the first direction, a is the width of the stitching seam area in the first direction, θ is the inclination angle, and the first direction is perpendicular to the direction of the edge stitching line.

5. The display panel according to claim 4, wherein: The value of L1 is between 0.8 and 1.2, and the inclination angle is between 44.5° and 61.8°.

6. The display panel according to claim 4, wherein: The ratio of 2a to B is less than 1.6, and the value of pitch is between 800 and 1000 μm, wherein pitch=B+b, and b is the gap between the adjacent pixel units in the first direction.

7. The display panel according to claim 1, wherein: The cushion layer includes at least one organic layer, at least one inorganic layer and / or at least one metal layer.

8. The display panel according to claim 6, wherein: The pad bevel 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, wherein B is the width of the pixel unit in the first direction, c is the thickness of one layer of the metal layer, and the first direction is perpendicular to the direction where the edge stitching line is located.

9. The display panel according to claim 6, wherein: The cushion layer includes multiple organic layers, the number of layers of the organic layers is related to the width of the pixel unit in the first direction, the number of layers of the organic layers n3 = tanθ*B / e, wherein B is the width of the pixel unit in the first direction, e is the thickness of one layer of the organic layer, and the first direction is perpendicular to the direction where the edge stitching line is located.

10. A splicing display device, characterized in that: The device comprises at least two display panels according to any one of claims 1 to 9.

11. A brightness compensation method, characterized in that: Applied to the spliced ​​display device according to claim 10, the spliced ​​display device comprises at least two display panels, and the method comprises: Shooting step: shooting an optical image when the spliced ​​display device displays a brightness test screen; Calculation step: determining a brightness difference value between a joint seam area and a middle pixel area of ​​the display panel in the optical image; Determination step: determining whether the brightness difference value is within a 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 stitching line pixel area of ​​the display panel according to the brightness difference value; Recording step: repeatedly executing the shooting step, the calculating step, the compensating step and the judging step until the brightness difference between the seam area and the middle pixel area of ​​the display panel in the optical image is within a preset threshold range, and recording the current current compensation value.

12. A display method, characterized in that: Applied to the spliced ​​display device according to claim 10, the spliced ​​display device comprises at least two display panels, and the method comprises: Get the image to be displayed; The recorded current compensation value of the second pixel unit in the edge stitching line pixel area of ​​the display panel is obtained, brightness compensation is performed on the image to be displayed according to the current compensation value, and the image to be displayed after brightness compensation is displayed.

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