CN113707826A - Display panel and display device - Google Patents
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- CN113707826A CN113707826A CN202110979668.5A CN202110979668A CN113707826A CN 113707826 A CN113707826 A CN 113707826A CN 202110979668 A CN202110979668 A CN 202110979668A CN 113707826 A CN113707826 A CN 113707826A
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- H10K50/858—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
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- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
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- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
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Abstract
The invention discloses a display panel and a display device, which relate to the technical field of display and comprise: the light emitting device comprises a substrate, an array layer, a light emitting device layer, a first light adjusting layer and a second light adjusting layer; the light emitting device layer comprises a pixel defining layer and a plurality of light emitting devices arranged in an array; the light-emitting device comprises a first electrode, a light-emitting part and a second electrode which are positioned on one side of the array layer away from the substrate; the pixel defining layer comprises a plurality of openings exposing the first electrodes and a non-opening positioned between two adjacent openings; the first light adjusting layer comprises a plurality of light taking-out structures and a plurality of microstructures, the light taking-out structures are overlapped with the non-openings along the direction perpendicular to the substrate, and the microstructures are overlapped with the openings; the microstructure comprises a first light-emitting surface, and the plane where the first light-emitting surface is located is intersected with the plane where the substrate is located; the second light adjusting layer covers the first light adjusting layer along a direction perpendicular to the substrate, and the refractive index of the second light adjusting layer is larger than that of the first light adjusting layer. Therefore, the color cast problem in the display process can be improved.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display panel and a display device.
Background
With the continuous development of Display technology, the manufacturing technology of Display panels also tends to mature, and the existing Display panels mainly include Organic Light Emitting Display panels (OLEDs), Liquid Crystal Display panels (LCDs), Plasma Display Panels (PDPs), and the like. The organic light emitting display device as the self light emitting display device does not require a separate light source. Accordingly, the organic light emitting display device can operate at a low voltage, is light and thin, and provides high quality characteristics such as a wide viewing angle, high contrast, and fast response. Therefore, organic light emitting display devices have been receiving attention as next generation display devices. Organic Light-Emitting diodes (OLEDs) are used as Light sources for display devices and lighting devices, and have low power consumption, high resolution, fast response, and other excellent photoelectric characteristics, and are becoming the mainstream technology of OLED display.
In the related art, in order to improve the light emitting efficiency of the OLED display panel, a material with a low refractive index and a material with a high refractive index are arranged in the light emitting direction of the OLED display panel, and the final light emitting amount is improved through refraction and reflection of light. Although the design can improve the light-emitting efficiency of the display panel, the display effect is affected by a large color cast phenomenon under certain viewing angles.
Disclosure of Invention
In view of this, the present invention provides a display panel and a display device, which are beneficial to improving the color cast phenomenon during the display process and improving the display effect.
In a first aspect, the present application provides a display panel comprising:
a substrate;
the array layer is positioned on one side of the substrate;
a light emitting device layer on one side of the substrate; the light emitting device layer comprises a pixel defining layer and a plurality of light emitting devices arranged in an array; the light-emitting device comprises a first electrode, a light-emitting part and a second electrode which are positioned on one side of the array layer away from the substrate; the pixel defining layer includes a plurality of openings exposing the first electrode and a non-opening between adjacent two openings;
the first light adjusting layer is positioned on one side, far away from the substrate, of the light emitting device layer and comprises a plurality of light extraction structures and a plurality of microstructures, the light extraction structures are overlapped with the non-openings in the direction perpendicular to the substrate, and the microstructures are overlapped with the openings; the microstructure comprises a first light-emitting surface, and the plane where the first light-emitting surface is located is intersected with the plane where the substrate is located;
the second light adjustment layer is located first light adjustment layer is kept away from one side of base plate, along the perpendicular to the direction of base plate, the second light adjustment layer covers first light adjustment layer, the refracting index of second light adjustment layer is greater than the refracting index of first light adjustment layer.
In a second aspect, the present application provides a display device, which includes a display panel provided in the present invention.
Compared with the prior art, the display panel and the display device provided by the invention at least realize the following beneficial effects:
in the display panel and the display device provided by the invention, the microstructure is arranged at the position corresponding to the opening, the microstructure comprises a first light-emitting surface, and the plane where the first light-emitting surface is located is intersected with the plane where the substrate is located. Since the microstructure is disposed on a side of the opening away from the substrate, that is, on a side of the light emitting device layer away from the substrate, it is equivalent to be disposed in a light emitting direction of the light emitting device layer. At least part of light with a small visual angle in the light emitted by the light-emitting device layer can be emitted to the microstructure, and because the first light-emitting surface of the microstructure is inclined relative to the substrate and the refractive index of the microstructure is smaller than that of the second light adjusting layer, the light emitted from the first light-emitting surface is refracted and emitted from a larger visual angle. So, shift to great visual angle in the light of at least some little visual angle in the light that the luminescent device layer jetted out in other words to be favorable to remedying the light loss when the light at big visual angle is deflected to the small-angle by the light extraction structure who sets up in non-opening top, therefore be favorable to improving the problem that little visual angle colour cast is big, big visual angle colour cast is little, be favorable to promoting display panel's display effect.
Of course, it is not necessary for any product in which the present invention is practiced to achieve all of the above-described technical effects simultaneously.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic plan view of a display panel according to an embodiment of the invention;
FIG. 2 is an AA' cross-sectional view of the display panel of FIG. 1;
FIG. 3 is a schematic view of a microstructure and a second light adjusting layer corresponding to the same opening;
FIG. 4 is a schematic diagram of an orthographic projection of a single microstructure on a substrate;
FIG. 5 is a schematic diagram of a light path of light transmitted through the microstructures corresponding to the same opening;
FIG. 6 is a schematic top view of a plurality of microstructures overlapping the same opening;
FIG. 7 shows a cross-sectional view of a BB' of the microstructure and the second light modulating layer of FIG. 6;
FIG. 8 shows another BB' cross-sectional view of the microstructure of FIG. 6 and a second light adjusting layer;
FIG. 9 is a schematic view of another structure of the microstructure and the second light adjusting layer corresponding to the same opening;
FIG. 10 is another schematic top view of a plurality of microstructures overlapping the same opening;
FIG. 11 is a cross-sectional view CC' of the microstructure and second light modulating layer of FIG. 10;
FIG. 12 is a schematic view of another structure of the microstructure and the second light adjusting layer corresponding to the same opening;
FIG. 13 is another schematic top view of a plurality of microstructures overlapping the same opening;
FIG. 14 is a DD' cross-sectional view of the microstructure and corresponding second light management layer of FIG. 13;
fig. 15 is a top view of a display device according to an embodiment of the invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Fig. 1 is a schematic plan view of a display panel according to an embodiment of the present invention, fig. 2 is an AA' cross-sectional view of the display panel in fig. 1, and referring to fig. 1 and fig. 2, a display panel 100 includes:
a substrate 10;
an array layer 20 located on one side of the substrate 10;
a light emitting device layer 30 on one side of the substrate 10; the light emitting device layer 30 includes a pixel defining layer 50 and a plurality of light emitting devices 301 arranged in an array; the light emitting device 301 includes a first electrode 301A, a light emitting portion 301B, and a second electrode 301C on a side of the array layer 20 away from the substrate 10; the pixel defining layer 50 includes a plurality of openings K exposing the first electrode 301A and a non-opening NK between two adjacent openings K;
a first light adjusting layer 60 located on a side of the light emitting device layer 30 away from the substrate 10, the first light adjusting layer 60 including a plurality of light extraction structures 71 and a plurality of microstructures 72, the light extraction structures 71 overlapping with the non-openings NK and the microstructures 72 overlapping with the openings K in a direction perpendicular to the substrate 10; the microstructure 72 includes a first light emitting surface S1, where a plane of the first light emitting surface S1 intersects with a plane of the substrate 10;
and a second light adjustment layer 80 located on a side of the first light adjustment layer 60 away from the substrate 10, wherein the second light adjustment layer 80 covers the first light adjustment layer 60 along a direction perpendicular to the substrate 10, and a refractive index of the second light adjustment layer 80 is greater than a refractive index of the first light adjustment layer 60. Alternatively, the refractive index of the first light adjusting layer 60 is 1.4 to 1.6 and the refractive index of the second light adjusting layer 80 is 1.65 to 1.9.
Specifically, with continued reference to fig. 1 and fig. 2, the display panel 100 provided in this embodiment may be an organic light emitting display panel, which has the advantages of self-luminescence, high brightness, wide viewing angle, and fast response, and may use a thinner organic material coating and a glass substrate without a backlight. The substrate 10 of this embodiment may be used as a carrier for carrying other structures of a display panel, and the substrate 10 may be a glass substrate, or may also be a flexible substrate, which is not specifically limited in this embodiment. The array layer 20 on one side of the substrate 10 may include a gate metal layer, a source/drain metal layer, an active layer, and an insulating layer (not shown) between the conductive film layers for forming a light emitting control unit of the light emitting device 301 of the light emitting device layer 30. The pixel defining layer 50 located on the side of the array away from the substrate 10 is used to define the arrangement position of each light emitting device 301 of the light emitting device layer 30, the pixel defining layer 50 may include a plurality of openings K, the openings K may at least penetrate through the pixel defining layer 50 along the direction in which the pixel defining layer 50 points perpendicularly to the substrate 10, and each opening K is used to arrange the light emitting device 301 of the light emitting device layer 30, that is, the orthographic projection of the light emitting device 301 to the light emitting surface of the display panel 100 and the orthographic projection of the opening K to the light emitting surface of the display panel 100 overlap each other. Each light emitting device 301 includes a first electrode 301A, a light emitting portion 301B, and a second electrode 301C on a side of the array layer 20 away from the substrate 10; each opening K of the pixel defining layer 50 is configured to expose a first electrode 301A of the light emitting device 301, optionally, the first electrode 301A may be an anode, and the second electrode 301C may be a cathode, when a current passes through the first electrode 301A and the second electrode 301C and forms an electric field between the first electrode 301A and the second electrode 301C, the light emitting portion 301B emits light, and a light emitting principle of the light emitting device 301 may be understood with reference to a structure and a principle of an organic light emitting device in the related art, which is not described herein again. The portion of the pixel defining layer 50 excluding the opening K is a non-opening NK. Optionally, the display panel 100 further includes an encapsulation layer 40 located on a side of the light emitting device layer 30 away from the substrate 10, for encapsulating and protecting the light emitting device 301 of the light emitting device layer 30, and optionally, the encapsulation layer 40 may include a stacked structure of an inorganic layer, an organic layer, and a plurality of film layers of the inorganic layer. Optionally, a functional film layer such as a touch layer may be disposed between the encapsulation layer 40 and the first light adjusting layer 60, which is not particularly limited in the present invention.
The first light adjusting layer 60 and the second light adjusting layer 80 are arranged on one side, far away from the substrate 10, of the light emitting device layer 30, and the first light adjusting layer 60 comprises a plurality of light extraction structures 71 and a plurality of microstructures 72, wherein the light extraction structures 71 are arranged on one side, far away from the substrate 10, of the non-opening NK, the microstructures 72 are arranged on one side, far away from the substrate 10, of the opening K, specifically, in the direction perpendicular to the substrate 10, the light extraction structures 71 are overlapped with the non-opening NK, and the microstructures 72 are overlapped with the opening K. Because the refractive index of the second light adjustment layer 80 is greater than the refractive index of the first light adjustment layer 60, at least a part of the light emitted from the light emitting device layer 30 is emitted to the light extraction structure 71, and is emitted from the light extraction structure 71 directly above the light emitting part 301B after being emitted to the second light adjustment layer 80, which is beneficial to deflecting the light emitted from the light emitting part 301B in a large angle to a small angle, thereby being beneficial to improving the light emitting efficiency of the display panel 100.
In the related art, when the light extraction structure 71 with the smaller refractive index is disposed in the non-open NK region in the light emitting direction of the light emitting device layer 30, and the second light adjustment layer 80 with the larger refractive index is disposed on the side of the light extraction structure 71 away from the substrate 10, the light extraction structure 71 and the second light adjustment layer 80 are matched with each other, so as to adjust a part of large-angle light emitted from the light emitting device layer 30 to a small viewing angle, thereby facilitating improvement of the light emitting efficiency of the display panel 100. Meanwhile, after a part of light with a large viewing angle is deflected to a small viewing angle, light with a small viewing angle and light with a large viewing angle are deflected originally to be supplemented to the light spectrum of the light with a small viewing angle for neutralization, and the light spectrum changes, so that the viewing angle color cast track changes, for example, the phenomenon that some small viewing angles have color cast superstandards and some large viewing angles have color cast small.
In view of this, in the embodiment of the invention, the microstructure 72 is disposed at the position corresponding to the opening K, and the microstructure 72 includes the first light emitting surface S1, where the plane of the first light emitting surface S1 intersects with the plane of the substrate 10, that is, the first light emitting surface S1 is inclined with respect to the substrate 10. Since the microstructures 72 are disposed on the side of the opening K away from the substrate 10, that is, on the side of the light-emitting device layer 30 away from the substrate 10, it is equivalent to the light-emitting direction of the light-emitting device layer 30. At least a portion of the light emitted from the light emitting device layer 30 with a small viewing angle is emitted to the microstructure 72, and since the first light emitting surface S1 of the microstructure 72 is inclined with respect to the substrate 10 and the refractive index of the microstructure 72 is smaller than that of the second light adjusting layer 80, the light emitted from the first light emitting surface S1 is refracted and emitted from a larger viewing angle. Thus, at least part of the light rays with the small viewing angle in the light rays emitted by the light emitting device layer 30 are transferred to the larger viewing angle, so that the light loss caused when the light with the large viewing angle is deflected to a small angle by the light extraction structure 71 arranged above the non-opening NK is favorably compensated, the problems of large color shift and small color shift of the small viewing angle are favorably solved, and the display effect of the display panel 100 is favorably improved.
It is understood that fig. 2 is only illustrated for one cross section of the microstructures 72 corresponding to the same opening K, and does not represent the actual number and size of the microstructures 72 corresponding to the same opening K. In addition, the deflection angle of the first light emitting surface S1 in the microstructure 72 relative to the substrate 10 is also only illustrated, and does not represent the actual deflection angle.
Fig. 3 is a schematic structural view of a microstructure 72 and a second light-adjusting layer 80 corresponding to the same opening K, and fig. 4 is a schematic orthographic view of a single microstructure 72 on a substrate 10, please refer to fig. 2 to 4, in an alternative embodiment of the present invention, the microstructure 72 further includes a light-incident surface S0 and a second light-emitting surface S2 parallel to the substrate 10, along a direction perpendicular to a plane of the substrate 10, the light-incident surface S0 is located between the second light-emitting surface S2 and the light-emitting device layer 30, the orthographic projection of the second light-emitting surface S2 on the substrate 10 is a first projection, the orthographic projection of the light-incident surface S0 on the substrate 10 is a second projection, and an area of the first projection is smaller than an area of the second projection.
Specifically, in the display panel provided in the embodiment of the invention, the cross-sectional structure of the microstructure 72 is a trapezoid, wherein a waist of the trapezoid can be regarded as the first light emitting surface S1, an upper bottom with a smaller size can be regarded as the second light emitting surface S2, and a lower bottom with a larger size can be regarded as the light incident surface S0, wherein the light incident surface S0 is located between the second light emitting surface S2 and the substrate 10, and the light emitted from the light emitting device layer 30 is emitted into the microstructure 72 through the light incident surface S0. After the light emitted from the light emitting device layer 30 enters the light incident surface S0 of the microstructure 72, a part of the light is emitted from the second light emitting surface S2 of the microstructure 72, and a part of the light is emitted from the first light emitting surface S1 of the microstructure 72. Some light rays emitted from the light emitting device layer 30 are emitted to the light extraction structure, and are deflected to a small viewing angle under the action of the light extraction structure and the second light adjustment layer, so that the light extraction rate of the display panel is improved. The light emitted from the first light emitting surface S1 is deflected to a larger angle to be emitted under the adjusting action of the second light adjusting layer 80, which is equivalent to deflecting a part of light with a small viewing angle to a large viewing angle, so that the cross section of the microstructure 72 is trapezoidal, which is beneficial to improving the problems of large color deviation and small color deviation with a large viewing angle at the small viewing angle, and meanwhile, the microstructure 72 with a trapezoidal structure is easier to manufacture, which is beneficial to simplifying the manufacturing process of the display panel.
In an alternative embodiment of the present invention, in conjunction with FIGS. 3 and 4, the first projected edge B1 is equidistant from the second projected edge B2.
Specifically, referring to fig. 2 to 4, when the distance from the edge B1 of the first projection to the edge B2 of the second projection is equal, the cross-section trapezoid of the microstructure 72 is an isosceles trapezoid. When the cross section of the microstructure 72 is an isosceles trapezoid structure, two waists of the isosceles trapezoid form two first light emitting surfaces S1 of the microstructure 72, and the light rays perpendicularly emitted from the light incident surface S0 of the microstructure 72 to the two first light emitting surfaces S1 are emitted from the two first light emitting surfaces S1 to the second light adjusting layer 80, because the two first light emitting surfaces S1 are symmetrically arranged and the refractive indexes of the second light adjusting layer 80 are the same, the light rays are deflected to the same angle. That is to say, the light rays emitted from the two first light emitting surfaces S1 of the microstructure 72 can compensate for the light rays with the same viewing angle, so that the light quantity of the viewing angle line is increased, the color shift phenomenon at the corresponding viewing angle is improved, and the color shift difference at the large viewing angle and the small viewing angle is reduced.
Fig. 5 is a schematic diagram illustrating a light path of light transmitted through microstructures corresponding to the same opening, please refer to fig. 2 and 5, in an alternative embodiment of the present invention, the same opening K overlaps with a plurality of microstructures 72 along a direction perpendicular to the substrate 10; in the microstructures 72 overlapped with the same opening K, at least a part of the microstructures 72 have different refractive indexes.
Specifically, when the plurality of microstructures 72 are disposed at the positions corresponding to the same opening K, the plurality of microstructures 72 can be used to process the light, so that a part of the light with a small viewing angle is deflected to a larger viewing angle, and the light with a large viewing angle is compensated. When the refractive indexes of the microstructures 72 corresponding to the same opening K are set to be different at least partially, for example, the refractive index of a part of the microstructures 72 is one refractive index, and the refractive index of a part of the microstructures 72 is another refractive index, since the refractive index of the second light adjustment layer 80 is constant, when light is emitted from the microstructures 72 having different refractive indexes to the second light adjustment layer 80, the angles at which the light is deflected will be different. When the color shift of the display panel 100 at a certain viewing angle is small, for example, the color shift at 45 ° and 60 ° viewing angles is small, the refractive index of the microstructures 72 is set so that the light emitted from some microstructures 72 is deflected to the 45 ° viewing angle and the light emitted from some microstructures 72 is deflected to the 60 ° viewing angle, so as to purposefully compensate the light at a specific large viewing angle, which is more beneficial to improving the problems of large color shift at a small viewing angle and small color shift at a large viewing angle. Of course, the above-mentioned 45 ° and 60 ° are only examples, and in the actual application process, the light of the angle may be compensated according to the angle corresponding to the actual viewing angle with small color shift.
It should be noted that, when light rays with different large viewing angles are compensated by differentiating the refractive index of the microstructures 72, the microstructures 72 can be manufactured with the same specification and size, which is beneficial to simplifying the manufacturing process of the microstructures 72 in the display panel and improving the production efficiency of the display panel.
Fig. 6 is a schematic top view of a plurality of microstructures 72 overlapping the same opening K, and fig. 7 is a cross-sectional view of a BB' of the microstructures 72 and the second light modulation layer in fig. 6. in an alternative embodiment of the present invention, referring to fig. 2, 6 and 7, in the microstructures 72 overlapping the same opening K, the microstructures 72 include a central microstructure 720 and a peripheral microstructure 721, a distance from the central microstructure 720 to the non-opening NK is greater than a distance from the peripheral microstructure 721 to the non-opening NK, and a refractive index of the microstructures 72 increases along a direction in which the central microstructure 72 points to the peripheral microstructure 72.
It should be noted that fig. 6 only illustrates the manner in which the microstructures 72 overlapping with the same opening K are arranged in 5 rows and 5 columns, and in some other embodiments of the present invention, the number of the microstructures 72 overlapping with the same opening K may be other, which is not specifically limited by the present invention. For the light emitting portions corresponding to the same opening K, the angle of the central region is the largest, for example, close to 90 °, and the angle of the edge region is the smallest, for example, close to the angle of the light extraction structure (for example, between 45 degrees and 75 degrees). The central region is far from the edge region, so that the color gamut does not need to be adjusted too much for the light of the front view angle, and the inclination angle of the large angle does not have too large influence on the color gamut, therefore, along the direction F in which the central microstructure 720 points to the peripheral microstructure 721, the refractive index of the microstructure 72 is set to be in an increasing trend, so that the deflection angle of the light emitted from the first light emitting surface S1 of the central microstructure 720 is smaller than the deflection angle of the light emitted from the first light emitting surface S1 of the peripheral microstructure 721, and the deflection angles are in an increasing trend, for example, the change trend is 45 °, 60 °, 75 °, and the like, thereby realizing the compensation of the light with viewing angles of 45 °, 60 °, 75 °, and improving the problem of small color shift of the large view angle in a targeted manner while the brightness of the front view angle is not influenced.
Fig. 8 is a cross-sectional view BB' of the microstructure 72 and the second light-adjusting layer 80 in fig. 6, and with reference to fig. 2, 6 and 8, in an alternative embodiment of the invention, the same opening K overlaps with a plurality of microstructures 72 along a direction perpendicular to the substrate 10; an included angle between the plane of the first light emitting surface S1 and the plane of the substrate 10 is a first angle α, and in the same opening K, the first angle α gradually decreases from the geometric center of the opening K to the direction F of the non-opening NK.
Specifically, referring to fig. 2, fig. 6 and fig. 8, in the microstructures 72 at different positions, the included angle between the plane where the first light emitting surface S1 is located and the plane where the substrate 10 is located is not completely the same, that is, the first angles α corresponding to the microstructures 72 at different positions are not completely the same. Specifically, at a position corresponding to the same opening K, the first angle α corresponding to the microstructure 72 is in a decreasing trend from the geometric center of the opening K to a direction of the non-opening NK surrounding the opening K, for example, the value of the first angle α of the microstructure 72 corresponding to the geometric center of the opening K is larger, and the value of the first angle α of the microstructure 72 is smaller at a position closer to the non-opening NK. Thus, when the first angle α is larger, the deflection angle of the light emitted from the first light emitting surface S1 of the corresponding microstructure 72 is smaller, for example, the light emitted through the first light emitting surface S1 of the central microstructure 720 is deflected to a 45 ° viewing angle and emitted; when the first angle α is smaller, the deflection angle of the light emitted from the first light emitting surface S1 of the corresponding microstructure 72 is larger, for example, the light emitted through the first light emitting surface S1 of the outermost peripheral microstructure 721 is deflected to a 60 ° viewing angle. Therefore, the light emitted from the first light emitting surface S1 of the microstructure 72 gradually increases in the direction from the geometric center of the opening K to the non-opening NK. For the light emitting portions corresponding to the same opening K, the angle of the central region is the largest, for example, close to 90 °, and the angle of the edge region is the smallest, for example, close to the angle of the light extraction structure (for example, between 45 degrees and 75 degrees). The central area is far from the edge area, so that the color gamut does not need to be adjusted too much for the light rays at the front viewing angle, and the inclination angle of the large angle does not affect the color gamut too much, so that the deflection angle of the light rays emitted from the first light emitting surface S1 of the microstructure 72 is gradually increased from the geometric center of the opening K to the direction of the non-opening NK, and the problem of small color shift at the large viewing angle is improved in a targeted manner while the brightness at the front viewing angle is not affected.
In addition, from the perspective of the manufacturing process, the geometric center of the opening K points to the direction of the non-opening NK, and the included angle between the plane of the first light emitting surface S1 and the plane of the substrate 10 gradually decreases, so that the microstructure 72 is easier to etch and the etching precision is higher.
With reference to fig. 8, in the same opening K, in the direction F from the geometric center of the opening to the non-opening, when the first angle α gradually decreases, the distance between the light incident surface S0 of the microstructure and the edge of the orthographic projection of the second light emitting surface S2 on the substrate tends to increase, i.e., d1 < d2 < d 3.
In some other embodiments of the present invention, if the light in the same opening is deflected along 45 °, 60 ° and 75 ° after the action of the microstructures, when the color shift at the viewing angle of 60 ° is relatively severe in the whole display process of the display panel, the amount of light at the viewing angle can be compensated by arranging a plurality of microstructures capable of deflecting the light to the viewing angle of 60 °; the size of the first light emitting surface of the corresponding microstructure can be increased by increasing the distance d2, so that more light can act on the first light emitting surface, and the first light emitting surface deflects to a 60 ° viewing angle, in which case, the size of d2 can be set to be larger than the sizes of d1 and d3, and if the degree of color shift at a 45 ° viewing angle is smaller than that at a 75 ° viewing angle, and the degree of color shift at a 75 ° viewing angle is smaller than that at a 60 ° viewing angle, d2 > d3 > d1 can be set.
Fig. 9 is another schematic structural diagram of the microstructure 72 and the second light-adjusting layer 80 corresponding to the same opening K, in an alternative embodiment of the invention, the microstructure 72 further includes a side elevation surface S3 located between the light incident surface S0 and the first light emitting surface S1, the side elevation surface S3 is perpendicular to the light incident surface S0, and refractive indexes of the microstructures 72 are the same.
Specifically, fig. 9 shows another structure of the microstructure 72 of the present invention, please refer to fig. 2 and 9, in this embodiment, the cross section of the microstructure 72 is different from the trapezoidal structure, a side elevation surface S3 perpendicular to the light incident surface S0 is introduced between the light incident surface S0 and the first light emitting surface S1, and this structure can be regarded as a structure with two corners cut off on the basis of a columnar structure. In the light rays incident into the microstructure 72 from the light incident surface S0, when a part of the light rays are emitted to the second light adjustment layer 80 through the inclined first light emitting surface S1, the propagation direction of the light rays is deflected, which is equivalent to that at least a part of the light rays with small viewing angle in the light rays emitted from the light emitting device layer are transferred to a larger viewing angle, so that the light loss when the light with large viewing angle is deflected to a small angle by the light taking-out structure 71 arranged above the non-opening NK is compensated, and therefore, the problems of large color shift and small color shift of the small viewing angle are improved, and the display effect of the display panel 100 is improved.
In this embodiment, since the refractive indexes of the microstructures 72 are the same, the microstructures 72 can be made of the same material, which is beneficial to simplifying the production process of the display panel and improving the production efficiency.
Referring to fig. 2 and 9, the first light emitting surfaces S1 of the microstructures 72 have the same inclination angle with respect to the substrate 10, where the inclination angle refers to an acute angle between the plane of the first light emitting surface S1 and the plane of the substrate 10. When the inclination angles corresponding to the microstructures 72 are the same, the deflection angles of the light emitted from the first light emitting surface S1 of each microstructure 72 are the same, so that the brightness of the light at the viewing angle corresponding to the deflection angle can be compensated, and the problems of large color shift at small viewing angles and small color shift at large viewing angles can be solved.
Fig. 10 is another schematic top view of a plurality of microstructures 72 overlapping with the same opening K, and fig. 11 is a cross-sectional view CC' of the microstructures 72 and the second light modulation layer in fig. 10. referring to fig. 2, 10 and 11, in an alternative embodiment of the invention, the same opening K overlaps with the plurality of microstructures 72 along a direction perpendicular to the substrate 10; in the microstructures 72 overlapped with the same opening K, the heights of the microstructures 72 are the same, and the inclination angles of the first light emitting surfaces S1 of at least some of the microstructures 72 with respect to the substrate 10 are different.
Specifically, when the first light emitting surface S1 of the microstructure 72 has different inclination angles with respect to the substrate 10, when the light emitted to the first light emitting surface S1 along the same angle is emitted to the second light adjustment layer 80, the deflection angles of the light are different, and therefore, the inclination angles of the first light emitting surface S1 of different microstructures 72 are set to be different, so that the compensation of the light at different viewing angles can be realized, for example, a part of the microstructures 72 is used for compensating the light at a certain large viewing angle, and another part of the microstructures 72 is used for compensating the light at another large viewing angle, so as to effectively improve the problem of small color cast at different large viewing angles, and the display effect of the display panel 100 at different viewing angles is effectively improved by compensating the light at the small viewing angle with large color cast.
When the first light emitting surface S1 of the microstructure 72 has different inclination angles with respect to the substrate 10, the distances between the orthographic projections of the second light emitting surface S2 and the light incident surface S0 of the microstructure on the substrate will be different, for example, d11, d12 and d13 in the embodiment shown in fig. 11 will be different.
In an alternative embodiment of the invention, with reference to fig. 11, an included angle between a plane of the first light emitting surface S1 and a plane of the substrate 10 is a first angle β, and in the same opening K, the first angle β gradually decreases from a geometric center of the opening K to a direction toward the non-opening NK.
Specifically, in the embodiment shown in fig. 11, in the microstructures 72 at different positions, the included angles between the plane where the first light emitting surface S1 is located and the plane where the substrate 10 is located are not completely the same, that is, the first angles β corresponding to the microstructures 72 at different positions are not completely the same. Specifically, at the position corresponding to the same opening K, the first angle β corresponding to the microstructure 72 is in a decreasing trend from the geometric center of the opening K to the direction of the non-opening NK surrounding the opening K, for example, the value of the first angle β of the microstructure 72 corresponding to the geometric center of the opening K is larger, and the value of the first angle β of the microstructure 72 is smaller at the position closer to the non-opening NK. Thus, when the first angle β is larger, the deflection angle of the light emitted from the first light emitting surface S1 of the corresponding microstructure 72 is smaller; when the value of the first angle β is smaller, the deflection angle of the light emitted from the first light emitting surface S1 of the corresponding microstructure 72 is larger. Therefore, the light emitted from the first light emitting surface S1 of the microstructure 72 gradually increases in the direction from the geometric center of the opening K to the non-opening NK. The angle of the central region is the largest, for example, approximately 90 °, and the angle of the edge region is the smallest, for example, an angle close to the light extraction structure 71 (for example, between 45 degrees and 75 degrees) for the light-emitting portions corresponding to the same opening K. The central area is far from the edge area, so that the color gamut does not need to be adjusted too much for the light rays at the front viewing angle, and the inclination angle of the large angle does not affect the color gamut too much, so that the deflection angle of the light rays emitted from the first light emitting surface S1 of the microstructure 72 is gradually increased from the geometric center of the opening K to the direction of the non-opening NK, and the problem of small color shift at the large viewing angle is improved in a targeted manner while the brightness at the front viewing angle is not affected.
In addition, from the perspective of the manufacturing process, the geometric center of the opening K points to the direction of the non-opening NK, and the included angle between the plane of the first light emitting surface S1 and the plane of the substrate 10 gradually decreases, so that the microstructure 72 is easier to etch and the etching precision is higher.
With continued reference to fig. 10 and 11, in the same opening K, when the first angle β gradually decreases in the direction F from the geometric center of the opening to the non-opening, the distance between the light incident surface S0 of the microstructure and the edge of the orthographic projection of the second light emitting surface S2 on the substrate tends to increase, i.e., d11 < d12 < d 13.
In some other embodiments of the present invention, if the light in the same opening is deflected along 45 °, 60 ° and 75 ° after the action of the microstructures, when the color cast at the viewing angle of 75 ° is relatively severe in the whole display process of the display panel, the amount of light at the viewing angle can be compensated by arranging a plurality of microstructures capable of deflecting the light to the viewing angle of 75 °; the size of the first light emitting surface of the corresponding microstructure can be increased by increasing the distance d3, so that more light can act on the first light emitting surface, and further the light can be deflected to a 75 ° viewing angle through the first light emitting surface, in this case, the size of d13 can be set to be larger than the sizes of d11 and d12, and if the degree of color shift at a 45 ° viewing angle is smaller than that at a 60 ° viewing angle, and the degree of color shift at a 60 ° viewing angle is smaller than that at a 75 ° viewing angle, d13 > d12 > d11 can be set.
Fig. 12 is a schematic view illustrating another structure of the microstructure 72 and the second light-adjusting layer 80 corresponding to the same opening K, please refer to fig. 12, in an alternative embodiment of the present invention, at least a portion of the microstructure 72 includes at least two sub-structures, each of the sub-structures includes a first sub-structure 721 and a second sub-structure 722, and the second sub-structure 722 is coated on a surface of the first sub-structure 721 away from the substrate 10; in the same microstructure 72, the refractive index of each substructure increases in the direction in which the first substructure 721 points towards the second substructure 722.
Specifically, referring to fig. 2 and 12, fig. 12 shows a scheme that in the microstructure 72 corresponding to the same opening K, a part of the microstructure 72 includes two substructures, and a part of the microstructure 72 includes only one substructure, and when the microstructure 72 includes a first substructure 721 and a second substructure 722, in the same microstructure 72, the refractive index of each substructure shows an increasing trend along a direction in which the first substructure 721 points to the second substructure 722. Optionally, the cross section of each sub-structure is trapezoidal, the waist of the trapezoid serves as the first light emitting surface S1 of each sub-structure, the lower bottoms of each sub-structure are located on the same plane, and the upper bottoms of each sub-structure are located on different planes. When light enters the microstructure 72 formed by at least two substructures, the light is deflected once when the light is emitted from the first substructure 721 to the second substructure 722, and the light with a small angle is deflected to a larger angle; the light rays that have undergone one deflection are further deflected when they are emitted from the second substructure 722 to the second light modulating layer 80, and the light rays with small angles are deflected twice and then become light rays with larger angles. Therefore, by combining at least two substructures with different refractive indexes to form the microstructure 72, light rays with small angles can be deflected to large angles, and the problems of large color deviation and small color deviation at large viewing angles of small viewing angles are improved. When a part of the microstructures 72 includes one substructure and a part of the microstructures 72 includes two or more substructures, the light beams having different numbers of substructures are emitted to the second light adjustment layer 80 at different deflection angles, so that the light beams having different large viewing angles can be compensated, and the problem of small color cast at different large viewing angles is solved.
In an alternative embodiment of the invention, with reference to fig. 12, the heights of the microstructures 72 are the same, and the inclination angles θ of the first light emitting surfaces S1 of the microstructures 72 relative to the substrate 10 are the same.
When the microstructure 72 includes at least two sub-structures, the first light emitting surface S1 of the microstructure 72 refers to the first light emitting surface S1 of the outermost sub-structure. In the embodiment, the deflection angle of the light is adjusted by setting the number of the sub-structures included in the micro-structures 72, at this time, the inclination angles of the first light emitting surfaces S1 of the micro-structures 72 with respect to the substrate 10 can be set to be the same, so that the first light emitting surfaces S1 of the micro-structures 72 are set to have the same inclination angle, which is beneficial to improving the problems of large color shift at a small viewing angle and small color shift at a large viewing angle, and is beneficial to simplifying the manufacturing process of the display panel and improving the production efficiency of the display panel.
Fig. 13 is another schematic top view of a plurality of microstructures 72 overlapping the same opening K, and fig. 14 is a DD' cross-sectional view of the microstructures 72 and the corresponding second light-adjusting layer 80 in fig. 13. in an alternative embodiment of the present invention, referring to fig. 2, 13 and 14, in the same opening K, the number of substructures included in each microstructure 72 is gradually reduced from the geometric center of the opening K to the direction other than the opening NK.
It should be noted that fig. 13 only illustrates the manner in which the microstructures 72 overlapped with the same opening K are arranged in 5 rows and 5 columns, and in some other embodiments of the present invention, the number of the microstructures 72 overlapped with the same opening K may be other, which is not specifically limited by the present invention. The angle of the central region is the largest, for example, approximately 90 °, and the angle of the edge region is the smallest, for example, an angle close to the light extraction structure 71 (for example, between 45 degrees and 75 degrees) for the light-emitting portions corresponding to the same opening K. The central region is far from the edge region, so that the color gamut does not need to be adjusted too much for the light rays of the front view angle. Therefore, when the number of the sub-structures included in the micro-structures 72 located at the geometric center of the opening K is set to be the maximum, the color shift of the front viewing angle is not affected, and the color shift phenomenon of the large viewing angle can be alleviated by the light emitted from the micro-structures 72. In addition, from the viewpoint of the manufacturing process, when the microstructure 72 located at the geometric center of the opening K includes the largest number of sub-structures, since it is far from the light extraction structure 71, the light deflected to a small viewing angle by the light extraction structure 71 is not affected.
Considering that the degree of color shift is different in some display panels 100 at large viewing angles, it is assumed that the color shift is smaller at 60 ° and 75 ° viewing angles, where the degree of color shift smaller at 60 ° viewing angle is more serious and the degree of color shift smaller at 75 ° viewing angle is weaker. At this time, in the microstructures 72 corresponding to the same opening K, the number of the microstructures 72 for compensating at the viewing angle of 60 ° can be set to be larger, so that the light compensation amount at the viewing angle of 60 ° is larger; the number of microstructures 72 for compensating the viewing angle of 75 can be set small so that the amount of compensation for the light at the viewing angle of 75 is moderate. Therefore, the actual number of the corresponding microstructures 72 is set according to the degree of color cast being small, so that color cast at different large viewing angles is compensated in a targeted manner, and the display effect of the display panel 100 at different viewing angles can be improved.
Based on the same inventive concept, the present invention further provides a display device 200, and fig. 15 is a top view of the display device 200 according to the embodiment of the present invention, which includes a display panel, wherein the display panel is the display panel 100 according to the embodiment of the present invention. In the display device 200 of the present invention, the microstructure is disposed at the position corresponding to the opening, and at least a part of the light with a small angle is deflected to a large angle by the microstructure, so that light loss when the light with a large viewing angle is deflected to a small angle by the light extraction structure disposed above the non-opening is compensated, and therefore, the problems of large color shift and small color shift of the small viewing angle are improved, and the display effect of the display device is improved.
It should be noted that, for the embodiments of the display device 200 provided in the embodiments of the present application, reference may be made to the embodiments of the display panel 100, and repeated descriptions are omitted. The apparatus provided herein may be embodied as: any product or component with practical functions such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
As can be seen from the above embodiments, the display panel and the display device provided by the present invention at least achieve the following advantages:
in the display panel and the display device provided by the invention, the microstructure is arranged at the position corresponding to the opening, the microstructure comprises a first light-emitting surface, and the plane where the first light-emitting surface is located is intersected with the plane where the substrate is located. Since the microstructure is disposed on a side of the opening away from the substrate, that is, on a side of the light emitting device layer away from the substrate, it is equivalent to be disposed in a light emitting direction of the light emitting device layer. At least part of light with a small visual angle in the light emitted by the light-emitting device layer can be emitted to the microstructure, and because the first light-emitting surface of the microstructure is inclined relative to the substrate and the refractive index of the microstructure is smaller than that of the second light adjusting layer, the light emitted from the first light-emitting surface is refracted and emitted from a larger visual angle. So, shift to great visual angle in the light of at least some little visual angle in the light that the luminescent device layer jetted out in other words to be favorable to remedying the light loss when the light at big visual angle is deflected to the small-angle by the light extraction structure who sets up in non-opening top, therefore be favorable to improving the problem that little visual angle colour cast is big, big visual angle colour cast is little, be favorable to promoting display panel's display effect.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (13)
1. A display panel, comprising:
a substrate;
the array layer is positioned on one side of the substrate;
a light emitting device layer on one side of the substrate; the light emitting device layer comprises a pixel defining layer and a plurality of light emitting devices arranged in an array; the light-emitting device comprises a first electrode, a light-emitting part and a second electrode which are positioned on one side of the array layer away from the substrate; the pixel defining layer includes a plurality of openings exposing the first electrode and a non-opening between adjacent two openings;
the first light adjusting layer is positioned on one side, far away from the substrate, of the light emitting device layer and comprises a plurality of light extraction structures and a plurality of microstructures, the light extraction structures are overlapped with the non-openings in the direction perpendicular to the substrate, and the microstructures are overlapped with the openings; the microstructure comprises a first light-emitting surface, and the plane where the first light-emitting surface is located is intersected with the plane where the substrate is located;
the second light adjustment layer is located first light adjustment layer is kept away from one side of base plate, along the perpendicular to the direction of base plate, the second light adjustment layer covers first light adjustment layer, the refracting index of second light adjustment layer is greater than the refracting index of first light adjustment layer.
2. The display panel of claim 1, wherein the microstructure further includes a light incident surface and a second light emitting surface parallel to the substrate, and along a direction perpendicular to a plane where the substrate is located, the light incident surface is located between the second light emitting surface and the light emitting device layer, an orthogonal projection of the second light emitting surface on the substrate is a first projection, an orthogonal projection of the light incident surface on the substrate is a second projection, and an area of the first projection is smaller than an area of the second projection.
3. The display panel according to claim 2,
the edges of the first projection are equidistant from the edges of the second projection.
4. The display panel according to claim 3, wherein the same opening overlaps with the plurality of microstructures in a direction perpendicular to the substrate; in the microstructures overlapped with the same opening, the refractive indexes of at least part of the microstructures are different.
5. The display panel according to claim 4, wherein the microstructures overlapping the same opening comprise a central microstructure and a peripheral microstructure, the distance from the central microstructure to the non-opening is greater than the distance from the peripheral microstructure to the non-opening, and the refractive index of the microstructures increases along the direction from the central microstructure to the peripheral microstructure.
6. The display panel according to claim 2,
the same opening is overlapped with a plurality of microstructures along the direction vertical to the substrate;
the included angle between the plane of the first light emitting surface and the plane of the substrate is a first angle, and the first angle is gradually reduced from the geometric center of the opening to the direction of the non-opening in the same opening.
7. The display panel of claim 2, wherein the microstructures further comprise a side elevation surface between the light incident surface and the first light emitting surface, the side elevation surface is perpendicular to the light incident surface, and refractive indexes of the microstructures are the same.
8. The display panel according to claim 3 or 7, wherein the same opening overlaps with the plurality of microstructures in a direction perpendicular to the substrate; in the microstructures overlapped with the same opening, the heights of the microstructures are the same, and the inclination angles of the first light emitting surfaces of at least part of the microstructures relative to the substrate are different.
9. The display panel according to claim 8, wherein an included angle between a plane of the first light emitting surface and a plane of the substrate is a first angle, and the first angle gradually decreases from a geometric center of the opening to a direction toward the non-opening in the same opening.
10. The display panel according to claim 3, wherein at least part of the microstructures comprise at least two substructures, and the substructures comprise a first substructure and a second substructure, and the second substructure coats the surface of the first substructure, which is far away from the substrate;
in the direction in which the first substructure points towards the second substructure, the refractive index of each of the substructures increases progressively in the same microstructure.
11. The display panel according to claim 10, wherein the microstructures have the same height, and the first light emitting surfaces of the microstructures have the same inclination angle with respect to the substrate.
12. The display panel according to claim 10,
in the same opening, the number of the substructures included in each microstructure is gradually reduced from the geometric center of the opening to the direction of the non-opening.
13. A display device characterized by comprising the display panel according to any one of claims 1 to 12.
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