CN111508343A - Display panel and display device - Google Patents
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- 230000000694 effects Effects 0.000 abstract description 7
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Abstract
The embodiment of the invention provides a display panel and a display device. The display panel comprises a plane area and at least one bending area, wherein the bending area is positioned on one side of the plane area, and the bending area is connected with the plane area: the display panel includes: a substrate base plate; a display layer on the base substrate, the display layer including a plurality of light emitting devices; the functional film layer is positioned on one side of the display layer, which is far away from the substrate base plate; wherein, in the bending zone: the thickness of the functional film layer gradually becomes smaller from the direction close to the plane area to the direction far away from the plane area. According to the embodiment of the invention, the light rays emitted from the functional film layer in the bending area are converged towards the direction of the plane area, the problem of color cast of the bending area of the display panel when the display panel is viewed in the front view direction is solved, and the display effect is improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display panel and a display device.
Background
With the application of display technology in intelligent wearing and other portable electronic devices, smooth use experience of users is continuously pursued in the aspect of electronic product design, and better visual experience is also pursued more and more. The curved screen has very round edges, so that the arc appearance of the display device is more attractive, and the curved screen becomes one direction of current research.
Disclosure of Invention
The embodiment of the invention provides a display panel and a display device, which are used for solving the problem of color cast of the edge of a curved display screen in the prior art.
In a first aspect, an embodiment of the present invention provides a display panel, including: the bending area is positioned on one side of the plane area, and the bending area is connected with the plane area: the display panel includes:
a substrate base plate;
a display layer on the base substrate, the display layer including a plurality of light emitting devices;
the functional film layer is positioned on one side of the display layer, which is far away from the substrate base plate; wherein the content of the first and second substances,
in the bending zone: the thickness of the functional film layer gradually becomes smaller from the direction close to the plane area to the direction far away from the plane area.
In a second aspect, an embodiment of the present invention further provides a display device, including any one of the display panels provided in the embodiments of the present invention.
The display panel and the display device provided by the embodiment of the invention have the following beneficial effects: the thickness of functional film layer diminishes gradually in the direction of keeping away from the plane district by being close to the plane district pointing direction in setting up the bending zone, then all assembles to the direction in plane district at the bending zone via the light that functional film layer jetted out to improve the colour cast problem of the bending zone of display panel when the front view direction is watched, promote display effect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without inventive labor.
Fig. 1 is a schematic view of a display panel according to an embodiment of the invention;
FIG. 2 is a simplified cross-sectional diagram of a display panel according to an embodiment of the present invention;
FIG. 3 is an enlarged partial view of FIG. 2 at the location of region Q;
FIG. 4 is a schematic diagram of an application of a display panel according to an embodiment of the present invention;
FIG. 5 is another simplified enlarged partial schematic view of FIG. 2 at the location of region Q;
FIG. 6 is another enlarged partial schematic view of FIG. 2 at the location of region Q;
FIG. 7 is another enlarged partial schematic view of FIG. 2 at the location of region Q;
FIG. 8 is another enlarged partial schematic view of FIG. 2 at the location of region Q;
FIG. 9 is another enlarged partial schematic view of FIG. 2 at the location of region Q;
FIG. 10 is an enlarged, fragmentary view of another portion of FIG. 2 at the location of region Q;
FIG. 11 is another enlarged partial schematic view of FIG. 2 at the location of region Q;
FIG. 12 is an enlarged, fragmentary view of another portion of FIG. 2 at the location of region Q;
fig. 13 is a schematic view of a display device according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
Embodiments of the present invention provide a display panel and a display device, where the display panel may be a hyperboloid display panel or a four-curved-surface display panel, or may also be a display panel with only one curved region. Through the thickness design of the functional film layer positioned in the bending area, the light emitting direction of the light emitted by the bending area is changed, and the light emitted by the bending area is converged towards the direction of the plane area of the display panel, so that the problem of color cast of the edge (bending area) of the display panel when the display panel is viewed in the front view direction is solved, and the display effect is improved.
Fig. 1 is a schematic view of a display panel according to an embodiment of the present invention, fig. 2 is a simplified cross-sectional view of the display panel according to the embodiment of the present invention, and fig. 3 is a partially enlarged view of a region Q in fig. 2.
As shown in fig. 1 and 2, the display panel includes a planar area 11 and at least one curved area 22, the curved area 22 is located at one side of the planar area 11, and the curved area 22 is connected to the planar area 11. The figure shows that both sides of the planar area 11 are provided with curved areas 22, i.e. the figure shows that the display panel is a hyperboloid display panel. In another embodiment, the display panel is a four-curved display panel, and the display panel is provided with the curved regions 22 around the planar region 11.
As shown in fig. 3, the display panel includes: the display device comprises a substrate base plate 101, a display layer 102 and a functional film layer 103, wherein the display layer 102 is positioned on the substrate base plate 101, the display layer 102 comprises a plurality of light-emitting devices P, only the light-emitting devices P are simplified and shown in the figure, and each light-emitting device P comprises an anode, a light-emitting layer and a cathode which are sequentially stacked; the functional film layer 103 is located on one side of the display layer 102 away from the substrate base plate 101; an array layer 104 is further disposed between the substrate 101 and the display layer 102, the array layer 104 includes a plurality of pixel circuits (not shown), the light emitting devices P are electrically connected to the pixel circuits, and the pixel circuits are used for driving the light emitting devices P to perform light emitting display. Within the bending zone 22 as illustrated in the figure: the thickness of the functional film layer 103 gradually decreases in a direction e from the near planar area 11 to the far planar area 11. In the display panel provided in the embodiment of the present invention, the bending direction of the bending region 22 is a light exit direction departing from the display panel, wherein the light exit direction is the same as the light exit direction of the display layer, and the light exit direction in the implementation of the present invention is a direction pointing from the display layer to the functional film layer. In addition, the functional film layer 103 may be a structural layer in the display panel or be composed of a plurality of structural layers, and the specific structure of the functional film layer 103 will be described in the following specific embodiments.
Rays S1 and S2 are shown in fig. 3. The light ray S1 is emitted when the functional film 103 in the bending region 22 has a uniform thickness, and the light emitted by the light emitting device P S0 penetrates the functional film; the light ray S2 is a light ray emitted by the light emitting device P after the light ray S0 penetrates the functional film layer 103 after the thickness of the functional film layer is gradually changed in the embodiment of the present application. It can be seen that, after the thickness of the functional film layer 103 is gradually decreased, the direction of the normal of the outer surface of the functional film layer 103 (the surface of the functional film layer 103 on the side away from the display layer 102) from which the light S0 exits is changed. The light ray S2 is inclined to the light ray S1 in the direction close to the planar area 11, that is, the light ray emitted through the functional film 103 in the bending area 22 is converged in the direction of the planar area 11. In the embodiment of the present invention, by setting the thickness of the functional film layer in the bending region to gradually decrease from the direction close to the planar region to the direction away from the planar region, light rays emitted from the functional film layer in the bending region converge toward the planar region, thereby improving the color shift problem of the bending region of the display panel when the display panel is viewed in the front view direction and enhancing the display effect.
As shown in fig. 3, in the bending region 22, the functional film layer 103 includes a first surface M1 and a second surface M2 opposite to each other along the light emitting direction, the first surface M1 is a surface away from the display layer 102, and the second surface M2 is a surface close to the display layer 102; the first surface M1 is a curved surface, and the second surface M2 is a curved surface. Through setting up two surfaces of functional film layer 103 in the bending zone 22 and being the curved surface, then can guarantee that the gradual change law of functional film layer 103 thickness is unanimous in the bending zone 22, the light of department outgoing all can assemble to the direction in plane district in the bending zone to improve the look bias problem of the bending zone of display panel when the front view direction is watched. In addition, both surfaces can adapt to the curved shape of other structural layers in the curved region 22, and are in close contact with other structural layers, which is beneficial to the realization and the beauty of the curved shape of the curved region.
In one embodiment, within the bending zone 22: the radius of curvature at each position of the first surface M1 is the same, and the radius of curvature at each position of the second surface M2 is the same. The radius of curvature is understood to be the inverse of the curvature of the curved surface. The radii of curvature at the respective positions of the first surface are the same, and the first surface is an arc in the cross-sectional view illustrated in fig. 3, and the radius of curvature of the first surface is the radius of the arc on which it is located. Similarly, in the cross-sectional schematic view, the second surface is an arc, and the radius of curvature of the second surface is the radius of the arc where the second surface is located. The first surface and the second surface are both curved surfaces, so that the gradual change of the thickness of the functional film layer in the bending area can be ensured, and the emergent light at each position of the bending area can be converged towards the direction of the plane area, thereby improving the color cast problem of the bending area of the display panel when the display panel is watched in the front view direction. In addition, the curvature radiuses of the first surface and the second surface are fixed values, the design of the functional film layer in the bending area is simpler, and the manufacturing process of the display panel is simplified.
In an embodiment, fig. 4 is a schematic diagram illustrating an application of a display panel according to an embodiment of the present invention. As shown in fig. 4, which only shows the functional film layer 103 in the panel in a simplified manner, in the bending region 22: the radius of curvature of the first surface M1 is R and the radius of curvature of the second surface M2 is R; the refractive index of the functional film layer 103 is n, and when the functional film layer 103 includes a plurality of structural layers, it can be understood that the average refractive index of the functional film layer 103 is n. Considering that the second surface M2 of the functional film 103 is an inner surface and the first surface M1 is an outer surface, in the embodiment of the invention, the thickness of the functional film 103 is gradually decreased in the direction from the near plane area to the far plane area in the bending area, that is, the light path is changed after the light exits from the first surface M1 of the functional film 103. The curvature radii at the positions of the first surface M1 in the bending region are the same, and the functional film layer 103 in the cross-sectional view is regarded as a spherical convex lens to simulate the light path of the emergent light refracted by the first surface M1, and in the cross-sectional view, the first surface M1 and the second surface M2 of the functional film layer 103 are both circular arcs. To simplify the principle derivation process, the functional film 103 is considered as a spherical convex lens, and the light is incident perpendicularly to the second surface M2, i.e. the light does not change direction after penetrating the second surface M2 of the functional film 103.
As shown in fig. 4, the light ray S3 and the light ray S4, the light ray S3 and the light ray S4 all converge toward the planar region 11, since the first surface M1 is a spherical convex lens, the light ray S3 and the light ray S4 are parallel, in the figure, the light ray S3 and the light ray S4 both have a certain included angle α with the front viewing direction e smaller than the critical light-emitting angle θ, when the included angle between the light exiting from the first surface M1 and the front viewing direction is smaller than or equal to θ, the chromatic aberration of the bending region 22 is invisible visually, and the standards for invisible visual aberration may be different from each other, and the critical light-emitting angle invisible visually may also have a certain influence due to the different manufacturing materials of the light-emitting device, the present invention does not make a limitation on the specific value of the critical light-emitting angle θ, in the actual product design, the critical light-converging angle θ can be simulated according to the specific cd justice notch Color difference value requirements of the manufacturer, the focal axis of the light ray S3522 and the focal point S468, the light ray S3527 can be considered as the principle that the focal point of the light ray S4642, the focal point of the curved light ray S3527, the light ray S4642, the focal point of the spherical convex lens, and the focal point S11, and the focal point of the focal point S4642, and the focal point of the curved light ray S3, and the focal point S11, and the focal point of
Wherein n is the refractive index of the functional film layer 103; n0 is the refractive index of air, n0 is 1; s is the distance between an intersection point O and the focus A, and the intersection point O is the intersection point of the spherical convex lens formed by the main optical axis Z and the first surface M1; s' is the distance focus of the intersection point of paraxial ray and main optical axis ZThe distance of point A, applied in the embodiment of the present invention, is such that paraxial ray S3 is parallel to the main optical axis Z, and S' is infinite; the point M is the spherical center of the spherical convex lens formed by the first surface M1, that is, the distance from the point O to the point M is the curvature radius R of the first surface M1. Therefore, S' is infinite, n0 is 1, and the above formula is simplified to obtain
(formula 1), that is, when the parameters S, n, and R satisfy this formula 1, the light rays penetrating through the first surface M1 of the functional film 103 in the bending region 22 can converge toward the planar region after being refracted, and the propagation directions of the light rays (such as the light rays S3 and S4 in the figure) exiting from the first surface M1 are all parallel to the principal optical axis Z.
In the derivation process of the simplified principle, it is assumed that the light does not change its direction after penetrating through the second surface M2 of the functional film 103, so to ensure that the propagation direction of the light emitted from the first surface M1 is parallel to the main optical axis Z, it is also required to satisfy that the light emitted from the functional film 103 to the first surface M1 passes through the center of the circular arc where the second surface M2 is located, so the focus a is the center of the second surface M2. As illustrated in fig. 4, the light ray passing through the main optical axis Z also passes through the center of the circle where the second surface M2 is located, so the radius r of the second surface M2 is approximately equal to S-d (formula 2), where d is the thickness of the functional film 103 in the planar area 11, and it can be understood that the functional film 103 in the curved area 22 has the maximum thickness d at the boundary position where the curved area 22 and the planar area 11 contact.
Substituting equation 1 into equation 2 yields:
(equation 3) in an embodiment of the present invention, the radius of curvature R of the first surface M1 in the bending region 22, the radius of curvature R of the second surface M2 in the bending region 22, the thickness d of the functional film 103 in the planar region 11, and the refractive index n of the functional film 103 satisfy equation 3, it can be known from the above principle that in the display panel provided in this embodiment, the light exiting through the first surface M1 of the functional film 103 has an included angle α with the front viewing direction e, and α is smaller than the critical valueThe color difference of the bent area is invisible at the light-emitting angle theta, so that the problem of display color cast of the bent area is improved.
In one embodiment, with continued reference to the simplified cross-sectional diagram of fig. 4, a virtual boundary Y is formed between the planar region 11 and the curved region 22, the virtual boundary Y is perpendicular to the planar region 11, the radius of curvature at each position of the second surface M2 in the curved region 22 is r, that is, the second surface M2 is an arc in the cross-sectional diagram, fig. 4 is a simplified diagram of a first cross-section of the display panel provided in the embodiment of the present invention, the second surface M2 is an arc in the first cross-section, the center of the arc where the second surface M2 is located is point a, as illustrated in the diagram, the perpendicular distance of point a from the virtual boundary Y is L, wherein L is ≦ r sin θ (formula 4), θ is a critical light exit angle, when the distance between the center a of the first surface M1 and the normal viewing direction e is less than or equal to θ, the visual angle of the curved region 22 is not visible, when the distance between the center a of the second surface M2 and the virtual boundary Y satisfies formula 4, the color difference between the normal viewing direction e is less than the aforementioned principle, and the visual angle of the curved region is not greater than 1.
In one embodiment, fig. 5 is another simplified enlarged view of a portion Q of fig. 2, where an exit ray S5 and a ray S6 refracted by a first surface M of the functional film 103 are shown in fig. 5, a ray S5 and a ray S6 are parallel and both parallel to a principal optical axis Z, and a principal optical axis Z of a spherical convex lens formed by a first surface M1 of the functional film 103 is set to be parallel to a front view direction e, a radius R of a curvature at each position of a second surface M2 in a cross-sectional view is set to be R, and a radius R of a curvature at each position of a first surface M1 is set to be R, as described with reference to fig. 4 and as shown in fig. 5, a circle, a circle b 2, a circle a focus of a spherical convex lens formed by a second surface M2 in a cross-sectional view is shown, and a virtual boundary Y, i.e, a circle b 11 and a circle b 3, a circle b 3 and a circle b 3, a circle b 3 and a circle b, a circle b 3 a circle b, a circle b 3 b and a circle b 3 c, a circle b 3 b, a circle c, a circle b, a circle c, a circle b, a circle c, a.
In the embodiment of the present invention, the functional film layer may be a structural layer in the display panel, or a plurality of structural layers may jointly form the functional film layer. When the functional film layer is formed by a plurality of structural layers together, the thickness of only part of the structural layers can be designed in a gradual change manner in the functional film layer in the bending area, and the thickness of all the structural layers can also be designed in a gradual change manner, so that the thickness of the functional film layer is gradually reduced in the bending area from the area close to the plane to the direction far away from the plane. The following will exemplify specific embodiments.
In one embodiment, fig. 6 is another enlarged partial view of the area Q of fig. 2. As shown in fig. 6, the display panel further includes an encapsulation layer 105, the encapsulation layer 105 is located on a side of the display layer 102 away from the substrate base plate 101, and the encapsulation layer 105 is used for encapsulating and protecting the light emitting device P in the display layer 102, so as to isolate the damage of water and oxygen to the light emitting device P and ensure the service life of the light emitting device P; the functional film layer 103 includes an encapsulation layer 105; wherein, within the bending zone 22: the thickness of the encapsulation layer 105 becomes gradually smaller in a direction e from near the planar area 11 to far from the planar area 11. Also illustrated in fig. 6 are a reflection reducing layer 106 and a cover layer 107 in the display panel, the reflection reducing layer 106 being used to reduce the reflection of ambient light by the display panel. The cover layer 107 serves to protect the structural layers inside the display panel. The antireflection layer 106 is located on a side of the encapsulation layer 105 away from the display layer 103, and the cover plate layer 107 is located on a side of the antireflection layer 106 away from the encapsulation layer 105. In the embodiment, the thickness of the packaging layer in the bending area is gradually reduced from the direction close to the plane area to the direction far away from the plane area, light rays emitted from the packaging layer in the bending area are gathered towards the direction of the plane area, and then light rays emitted from the packaging layer and then sequentially emitted from the antireflection layer and the cover plate layer are correspondingly gathered towards the direction of the plane area, so that the problem of color cast of the bending area of the display panel when the display panel is viewed in the front view direction is solved, and the display effect is improved.
Further, the packaging layer comprises at least one organic packaging layer and at least one inorganic packaging layer; fig. 7 is another enlarged partial view of fig. 2 at the location of region Q. As shown in fig. 7, taking the example that the encapsulation layer 105 includes one organic encapsulation layer 1051 and two inorganic encapsulation layers 1052, wherein, in the bending region 22: the thickness of the at least one organic encapsulation layer 1051 gradually decreases in a direction e from the near planar area 11 to the far planar area 11. The structure of the encapsulation layer 105 is shown for simplicity, in the encapsulation layer 105, the organic encapsulation layer 1051 is usually manufactured by an inkjet printing process, and the thickness of the organic encapsulation layer 1051 is usually larger than that of a single inorganic encapsulation layer. The thickness of the organic packaging layer in the bending area is designed in a gradual change mode, the thickness change interval is relatively large, the adjustment range of the transmission direction of the light emitted by the packaging layer is correspondingly large, the light emitted by the packaging layer in the bending area is easier to converge towards the direction of the plane area, and the process is simpler.
In one embodiment, fig. 8 is another enlarged partial view of the area Q of fig. 2. As shown in fig. 8, the display panel further includes a reflection reducing layer 106, where the reflection reducing layer 106 is located on a side of the display layer 102 away from the substrate base plate 101; the functional film layer 103 includes an antireflection layer 106; wherein, within the bending zone 22: the thickness of the antireflection layer 106 becomes gradually smaller in a direction e from near the planar area 11 toward far from the planar area 11. The encapsulation layer 105 and the cover plate layer 107 in the display panel are also illustrated. In the embodiment, the thickness of the anti-reflection layer in the bending area gradually decreases from the direction close to the plane area to the direction far away from the plane area, light rays emitted from the anti-reflection layer in the bending area are converged towards the direction of the plane area, and then light rays emitted from the anti-reflection layer and then emitted from the cover plate layer are converged towards the direction of the plane area correspondingly, so that the problem of color cast of the bending area of the display panel when the display panel is viewed in the front view direction is solved, and the display effect is improved.
Specifically, the anti-reflection layer comprises a phase layer and a linear polarizer. In one embodiment, the linear polarizer has a uniform thickness, and in the bending region: the thickness of the phase layer becomes gradually smaller in a direction from the near planar area toward the far planar area. In another embodiment, the phase layer has a uniform thickness, in the bending region: the thickness of the linear polarizer gradually decreases from the area close to the plane to the direction far away from the plane. In one embodiment, within the bending zone: the thickness of the phase layer and the thickness of the linear polarizer are gradually reduced from the direction close to the plane area to the direction far away from the plane area. In practice, the thickness of at least one of the phase layer and the linear polarizer can be designed in a gradual change mode according to specific product requirements, so that light rays emitted from the antireflection layer in the bending area are converged in the direction of the plane area.
In one embodiment, fig. 9 is another enlarged partial view of the area Q of fig. 2. As shown in fig. 9, the display panel further includes a cover plate layer 107, and the functional film layer 103 includes the cover plate layer 107; wherein, within the bending zone 22: the thickness of the cover sheet layer 107 becomes gradually smaller in a direction e from near the planar area 11 toward far from the planar area 11. In this embodiment, the thickness of the inner cover plate layer in the bending area gradually decreases from the direction close to the plane area to the direction far from the plane area, and then the light rays emitted from the cover plate layer in the bending area all converge towards the direction of the plane area, so that the problem of color cast of the bending area of the display panel when the display panel is viewed in the front view direction is solved, and the display effect is improved. In this embodiment, other panel structure layers within the cover plate layer do not need to be changed in design, and the design is simpler.
In another embodiment, a first glue layer is provided between the cover sheet layer and the antireflective layer and a second glue layer is provided between the antireflective layer and the encapsulation layer, wherein, in the bend region: in the direction from the area close to the plane to the area far from the plane, the thickness of at least one of the first adhesive layer and the second adhesive layer is gradually reduced.
In some alternative embodiments, the functional film layer comprises an encapsulation layer, an antireflection layer, a cover plate layer; wherein, in the bending zone: the thickness of at least one of the packaging layer, the antireflection layer and the cover plate layer gradually becomes smaller from the direction close to the plane area to the direction far away from the plane area.
In one embodiment, fig. 10 is another enlarged partial view of the area Q of fig. 2. As shown in fig. 10, the functional film layer 103 includes an encapsulation layer 105, an antireflection layer 106, and a cover plate layer 107, wherein, in the bending region 22: the thickness of the cover sheet layer 107 becomes gradually smaller in a direction e from near the planar area 11 toward far from the planar area 11. The display panel has a uniform thickness for both the encapsulation layer 105 and the anti-reflection layer 106. In this embodiment, the functional film layer includes an encapsulation layer, a reflection reducing layer, and a cover plate layer, and when the display panel is designed by applying the principle in the embodiment of fig. 4, the encapsulation layer, the reflection reducing layer, and the cover plate layer are considered as an integral spherical convex lens, and various parameters of the functional film layer in this embodiment are also applicable to the above formula 3, so that the light emitted from the functional film layer in the bending region can be ensured to be parallel to the front view direction, and the problem of color cast of the display in the bending region can be improved. Meanwhile, the thickness of one structural layer in the functional film layer in the bending area is designed to be gradually changed, and other structural layers do not need to be changed, so that the process is simpler.
In another embodiment, the functional film layer comprises an encapsulation layer, an antireflection layer and a cover plate layer; in the bending zone: the thickness of the packaging layer gradually becomes smaller from the direction close to the plane area to the direction far away from the plane area. The antireflection layer and the cover plate layer in the display panel are both uniform in thickness. Which are not illustrated in the drawings.
In another embodiment, the functional film layer comprises an encapsulation layer, an antireflection layer and a cover plate layer; in the bending zone: the thickness of the antireflection layer gradually decreases from the area close to the plane to the direction away from the plane. The packaging layer and the cover plate layer in the display panel are both uniform in thickness. Which are not illustrated in the drawings.
In one embodiment, fig. 11 is another enlarged partial view of the area Q of fig. 2. As shown in fig. 11, the functional film layer 103 includes an encapsulation layer 105, an antireflection layer 106, and a cover plate layer 107, wherein, in the bending region 22: in a direction e pointing away from the planar area 11 from the area 11, the thickness of the cover sheet layer 107 and the thickness of the antireflection layer 106 are gradually reduced. The encapsulation layer 105 in the display panel is of uniform thickness. In this embodiment, the functional film layer includes the encapsulation layer, the reflection reducing layer, and the cover plate layer, and the encapsulation layer, the reflection reducing layer, and the cover plate layer are considered as a whole spherical convex lens, and the various parameters of the functional film layer are also applicable to the above formula 3, so that the light emitted from the functional film layer in the bending region can be ensured to be parallel to the front viewing direction, and the problem of color cast in the bending region can be improved. Meanwhile, the two structural layers in the functional film layer in the bending area are only designed in a thickness gradient manner, so that the range of thickness change is relatively large, the corresponding adjustment range of the transmission direction of the light emitted by the functional film layer is relatively large, and the light emitted by the functional film layer in the bending area is easier to converge towards the direction of the plane area.
In another embodiment, unlike the embodiment of fig. 11, in the bending zone: the thicknesses of the cover plate layer and the packaging layer in the functional film layer are gradually reduced from the direction close to the plane area to the direction far away from the plane area.
In another embodiment, unlike the embodiment of fig. 11, in the bending zone: the thicknesses of the antireflection layer and the packaging layer in the functional film layer are gradually reduced from the direction close to the plane area to the direction far away from the plane area.
In one embodiment, fig. 12 is another enlarged partial view of the area Q of fig. 2. As shown in fig. 12, the functional film layer 103 includes an encapsulation layer 105, an antireflection layer 106, and a cover plate layer 107, wherein, in the bending region 22: in a direction e pointing away from the planar area 11 from the area 11, the thickness of the encapsulation layer 105, the thickness of the cover plate layer 107, and the thickness of the antireflection layer 106 are gradually reduced. In this embodiment, the functional film layer includes the encapsulation layer, the reflection reducing layer, and the cover plate layer, and the encapsulation layer, the reflection reducing layer, and the cover plate layer are considered as a whole spherical convex lens, and the various parameters of the functional film layer are also applicable to the above formula 3, so that the light emitted from the functional film layer in the bending region can be ensured to be parallel to the front viewing direction, and the problem of color cast in the bending region can be improved. Meanwhile, the thickness of three structural layers in the functional film layer in the bending area is designed in a gradual change mode, the range of thickness change is larger, the corresponding adjustment range of the transmission direction of the light emitted by the functional film layer is larger, and the light emitted by the functional film layer in the bending area is easier to converge towards the direction of the plane area.
Based on the same inventive concept, an embodiment of the present invention further provides a display device, fig. 13 is a schematic view of the display device provided in the embodiment of the present invention, and as shown in fig. 13, the display device includes the display panel 100 provided in any embodiment of the present invention. The specific structure of the display panel 100 has been described in detail in the above embodiments, and is not described herein again. Of course, the display device shown in fig. 13 is only a schematic illustration, and the display device may be any electronic device with a display function, such as a mobile phone, a tablet computer, a notebook computer, an electronic book, or a television.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (13)
1. A display panel comprising a planar area and at least one curved area, wherein the curved area is located on one side of the planar area, and the curved area is connected to the planar area: the display panel includes:
a substrate base plate;
a display layer over the base substrate, the display layer including a plurality of light emitting devices;
the functional film layer is positioned on one side of the display layer, which is far away from the substrate base plate; wherein the content of the first and second substances,
within the bending zone: the thickness of the functional film layer is gradually reduced from the direction close to the plane area to the direction far away from the plane area.
2. The display panel according to claim 1,
within the bending zone: the functional film layer comprises a first surface and a second surface which are opposite along the light emergent direction, the first surface is the surface far away from one side of the display layer, and the second surface is the surface close to one side of the display layer;
the first surface is a curved surface and the second surface is a curved surface.
3. The display panel according to claim 2,
within the bending zone: the radius of curvature at each location of the first surface is the same and the radius of curvature at each location of the second surface is the same.
4. The display panel according to claim 2,
within the bending zone: the radius of curvature of the first surface is R and the radius of curvature of the second surface is R;
wherein n is the refractive index of the functional film layer, and d is the thickness of the functional film layer in the planar region.
5. The display panel according to claim 2,
a virtual boundary is arranged between the plane area and the bending area, and the virtual boundary is perpendicular to the plane area;
the radius of curvature at each location of the second surface within the curved region is r,
the display panel has a first cross section, the second surface is an arc in the first cross section, and the vertical distance from the center of the arc where the second surface is located to the virtual boundary is L, wherein,
l is not more than r sin theta, theta is critical light-emitting angle, and when the included angle between the light emitted out of the first surface and the front viewing direction is not more than theta, the color difference of the bending area is not visible.
6. The display panel according to claim 5,
L＝0。
7. the display panel according to claim 1,
the display panel further includes:
the packaging layer is positioned on one side, far away from the substrate base plate, of the display layer;
the antireflection layer is used for reducing the reflection of the display panel to ambient light, and is positioned on one side of the packaging layer away from the display layer;
the cover plate layer is positioned on one side of the antireflection layer, which is far away from the packaging layer;
the functional film layer comprises the packaging layer, the antireflection layer and the cover plate layer; wherein, within the bending zone: the thickness of at least one of the packaging layer, the antireflection layer and the cover plate layer is gradually reduced from the direction close to the plane area to the direction far away from the plane area.
8. The display panel according to claim 1,
the display panel further includes: the packaging layer is positioned on one side, far away from the substrate base plate, of the display layer; the functional film layer comprises the packaging layer; wherein the content of the first and second substances,
within the bending zone: the thickness of the packaging layer gradually becomes smaller from the direction close to the plane area to the direction far away from the plane area.
9. The display panel according to claim 8,
the packaging layer comprises at least one organic packaging layer and at least one inorganic packaging layer; wherein the content of the first and second substances,
within the bending zone: the thickness of at least one organic encapsulation layer is gradually reduced from the direction close to the plane area to the direction far away from the plane area.
10. The display panel according to claim 1,
the display panel further comprises a reflection reducing layer, and the reflection reducing layer is positioned on one side of the display layer, which is far away from the substrate base plate; the functional film layer comprises the antireflection layer; wherein the content of the first and second substances,
within the bending zone: the thickness of the antireflection layer gradually becomes smaller in a direction from being close to the planar area to being far from the planar area.
11. The display panel according to claim 10,
the antireflection layer comprises a phase layer and a linear polarizer; wherein the content of the first and second substances,
within the bending zone: the thickness of one or two layers of the phase layer and the linear polarizer is gradually reduced from the direction close to the plane area to the direction far away from the plane area.
12. The display panel according to claim 1,
the display panel further comprises a cover plate layer, and the functional film layer comprises the cover plate layer; wherein the content of the first and second substances,
within the bending zone: the thickness of the cover sheet layer tapers from being closer to the planar area to being further away from the planar area.
13. A display device characterized by comprising the display panel according to any one of claims 1 to 12.
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