CN110277509B - Display panel and display device - Google Patents
Display panel and display device Download PDFInfo
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- CN110277509B CN110277509B CN201910550284.4A CN201910550284A CN110277509B CN 110277509 B CN110277509 B CN 110277509B CN 201910550284 A CN201910550284 A CN 201910550284A CN 110277509 B CN110277509 B CN 110277509B
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/84—Passivation; Containers; Encapsulations
- H10K50/841—Self-supporting sealing arrangements
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/84—Passivation; Containers; Encapsulations
- H10K50/844—Encapsulations
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
- H10K50/858—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
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Abstract
The invention discloses a display panel and a display device, wherein the display panel comprises a plurality of light-emitting devices, and the light-emitting devices comprise a first light-emitting device, a second light-emitting device and a third light-emitting device which respectively emit light with different colors; under a non-normal viewing angle, the light-emitting brightness of the third light-emitting device is greater than that of the first light-emitting device, and the light-emitting brightness of the third light-emitting device is greater than that of the second light-emitting device; and a second light extraction layer covering only the third light emitting device in a direction perpendicular to the substrate; the refractive index of the second light extraction layer is larger than that of the first light extraction layer, so that the brightness of light emitted by the third light emitting device perceived by human eyes under a non-normal viewing angle is reduced, the brightness of light emitted by the first light emitting device, the second light emitting device and the third light emitting device perceived by the human eyes under the non-normal viewing angle tends to be consistent, and the color cast phenomenon of white light under the normal viewing angle under the non-normal viewing angle is improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a display panel and a display device.
Background
With the development of display technology, display panels are increasingly widely used due to their advantages of high response amplitude, high color purity, wide viewing angle, foldability, low energy consumption, etc.
However, the display panel has the problem that white light under a normal viewing angle can show color cast to different degrees under a non-normal viewing angle, and the display effect is influenced.
Disclosure of Invention
The invention provides a display panel and a display device, which are used for improving the color cast phenomenon of the display panel at a non-positive viewing angle and improving the display effect.
In a first aspect, an embodiment of the present invention provides a display panel, including:
a substrate;
a plurality of light emitting devices disposed at one side of the substrate, the plurality of light emitting devices including a first light emitting device, a second light emitting device, and a third light emitting device that emit light of different colors, respectively; under a non-normal viewing angle, the light-emitting brightness of the third light-emitting device is greater than that of the first light-emitting device, and the light-emitting brightness of the third light-emitting device is greater than that of the second light-emitting device;
the first light extraction layer is arranged on one side of the plurality of light-emitting devices far away from the substrate;
the second light extraction layer is arranged on one side of the first light extraction layer, which is far away from the substrate; in a direction perpendicular to the substrate, the second light extraction layer covers only the third light emitting device;
wherein the refractive index of the second light extraction layer is greater than the refractive index of the first light extraction layer;
therefore, after the light emitted by the third light emitting device is emitted and refracted by the second light extraction layer, the included angle between the light emitted by the third light emitting device and the direction vertical to the light emitting surface of the display panel is reduced, and correspondingly, the light emitted by the third light emitting device which is emitted into human eyes under a non-normal viewing angle is reduced; the light rays emitted by the first light emitting device and the second light emitting device are directly emitted after passing through the first light extraction layer; the light emitted by the first light emitting device and received by the human eyes under the non-normal viewing angle is more than the light emitted by the third light emitting device, the light emitted by the second light emitting device and received by the human eyes under the non-normal viewing angle is more than the light emitted by the third light emitting device, the brightness of the light emitted by the third light emitting device and perceived by the human eyes under the non-normal viewing angle is reduced, the brightness of the light emitted by the first light emitting device, the brightness of the light emitted by the second light emitting device and the brightness of the light emitted by the third light emitting device and perceived by the human eyes under the non-normal viewing angle tend to be consistent, and the color cast phenomenon of the white light under the normal viewing angle under the non-normal viewing angle is improved.
Optionally, the display panel further includes: a third light extraction layer, the third light extraction layer and the second light extraction layer being in the same layer; the third light extraction layer comprises a base material, metal particles are doped in the base material, and the third light extraction layer covers the first light-emitting device and the second light-emitting device in the direction vertical to the substrate;
therefore, light emitted by the first light emitting device and light emitted by the second light emitting device under the non-normal viewing angle can be increased, the brightness of light emitted by the first light emitting device and the second light emitting device perceived by human eyes is increased, the brightness of light emitted by the first light emitting device, the brightness of light emitted by the second light emitting device and the brightness of light emitted by the third light emitting device perceived by human eyes under the non-normal viewing angle are more consistent, the phenomenon that white light under the normal viewing angle shows color cast under the non-normal viewing angle is further improved, and the display effect is improved.
Optionally, the display panel further includes: a fourth light extraction layer, the fourth light extraction layer and the second light extraction layer being in the same layer; in the direction perpendicular to the substrate, a fourth light extraction layer covers the first light emitting device and the second light emitting device, and the refractive index of the fourth light extraction layer is smaller than that of the first light extraction layer;
therefore, light rays emitted by the first light emitting device and light rays emitted by the second light emitting device which can enter human eyes under a non-normal viewing angle are increased, the brightness of light emitted by the first light emitting device and the second light emitting device which is perceived by human eyes is increased, the brightness of light emitted by the first light emitting device, the second light emitting device and the third light emitting device which are perceived by human eyes under the non-normal viewing angle is further enabled to be more consistent, the phenomenon that white light under the normal viewing angle shows color cast at the non-normal viewing angle is further improved, and the display effect is improved.
Optionally, the light emitting colors of the first light emitting device, the second light emitting device and the third light emitting device are red light, green light and blue light, respectively;
therefore, blue light entering human eyes under a non-normal viewing angle is reduced, red light and green light entering the human eyes are kept unchanged, the brightness of the red light, the brightness of the green light and the brightness of the blue light sensed by the human eyes under the non-normal viewing angle tend to be consistent, and the phenomenon that white light under the normal viewing angle shows bluish in the non-normal viewing angle can be improved.
Optionally, the display panel further includes: the first light absorption layer is arranged on one side, far away from the substrate, of the second light extraction layer and used for absorbing part of light rays emitted by the third light emitting device;
therefore, the first light absorbing layer can absorb part of light emitted by the third light emitting device, so that the light emitted from the light absorbing layer is reduced after the light emitted by the third light emitting device passes through the light absorbing layer, the light emitting brightness of the third light emitting device, the light emitting brightness of the light emitted by the first light emitting device and the light emitting brightness of the light emitted by the second light emitting device, which are perceived by human eyes under a non-normal viewing angle, tend to be consistent, the light emitting color of a certain light emitting device cannot be deviated after the light emitted by the first light emitting device, the light emitted by the second light emitting device and the light emitted by the third light emitting device are mixed under the non-normal viewing angle, the color of the display surface observed under the non-normal viewing angle and the normal viewing angle is close, and the color cast problem under the non-normal viewing angle is further improved.
Optionally, under the same light-emitting angle, the larger the luminance difference between the third light-emitting device and the first light-emitting device, and/or the luminance difference between the third light-emitting device and the second light-emitting device, the thicker the thickness of the first light-absorbing layer at the light-emitting angle position is;
therefore, at the light-emitting angle where the brightness difference between the third light-emitting device and other light-emitting devices (the first light-emitting device and the second light-emitting device) is larger, the light rays emitted by the third light-emitting device absorbed by the first light-absorbing layer are more, so that the brightness difference between the third light-emitting device and other light-emitting devices is reduced or even eliminated, the brightness of the light emitted by the first light-emitting device, the brightness of the light emitted by the second light-emitting device and the brightness of the light emitted by the third light-emitting device are closer to each other at each light-emitting angle, and the color cast phenomenon is further improved.
Optionally, the display panel further includes a second light-absorbing layer covering the first light-emitting device in a direction perpendicular to the substrate, and/or a third light-absorbing layer covering the second light-emitting device in a direction perpendicular to the substrate, where the second light-absorbing layer is configured to absorb a part of light emitted by the first light-emitting device, the second light-absorbing layer is configured to absorb a part of light emitted by the second light-emitting device, and the light emitted by the first light-emitting device absorbed by the second light-absorbing layer is less than the light emitted by the third light-emitting device absorbed by the first light-absorbing layer, and the light emitted by the second light-emitting device absorbed by the third light-absorbing layer is less than the light emitted by the third light-emitting device absorbed by the first light-absorbing layer;
in this way, the second light absorption layer can absorb part of the light emitted by the first light emitting device and/or the third light absorption layer can absorb part of the light emitted by the second light emitting device, so that the brightness of the light emitted by the first light emitting device, the brightness of the light emitted by the second light emitting device and the brightness of the light emitted by the third light emitting device under a non-normal viewing angle can be more approximately consistent, and the color shift can be further improved.
Optionally, the light emitting colors of the first light emitting device, the second light emitting device and the third light emitting device are blue light, green light and red light, respectively;
therefore, the first light absorption layer can absorb a part of red light, so that the red light brightness and the green light brightness sensed by human eyes are closer to each other and the blue light brightness is closer to each other under a non-normal viewing angle, and the problem that white light under the normal viewing angle is reddish under the non-normal viewing angle is solved.
Optionally, the display panel further includes an encapsulation layer disposed between the second light extraction layer and the first light absorption layer; an optical transparent adhesive is arranged between the first light absorption layer and the packaging layer;
so, can make luminescent device and light take out the layer encapsulation and in airtight space, prevent the invasion of water oxygen, be favorable to improving display panel's life to can fix the light-absorbing layer well.
In a second aspect, an embodiment of the present invention further provides a display device, including the display panel provided in the first aspect.
According to the display panel provided by the embodiment of the invention, the display panel comprises a plurality of light-emitting devices, wherein each light-emitting device comprises a first light-emitting device, a second light-emitting device and a third light-emitting device which respectively emit light with different colors; under a non-normal viewing angle, the light-emitting brightness of the third light-emitting device is larger than that of the first light-emitting device, and the light-emitting brightness of the third light-emitting device is larger than that of the second light-emitting device; and a second light extraction layer covering only the third light emitting device in a direction perpendicular to the substrate; the refractive index of the second light extraction layer is greater than that of the first light extraction layer, so that the included angle between the light emitted by the third light emitting device and the direction perpendicular to the light emitting surface of the display panel is reduced after the light emitted by the third light emitting device is emitted and refracted by the second light extraction layer, and correspondingly, the light emitted by the third light emitting device which is emitted into human eyes under a non-normal viewing angle is reduced; the light rays emitted by the first light emitting device and the second light emitting device are directly emitted after passing through the first light extraction layer; the light emitted by the first light emitting device and received by the human eyes under the non-normal viewing angle is more than the light emitted by the third light emitting device, the light emitted by the second light emitting device and received by the human eyes under the non-normal viewing angle is more than the light emitted by the third light emitting device, the brightness of the light emitted by the third light emitting device and perceived by the human eyes under the non-normal viewing angle is reduced, the brightness of the light emitted by the first light emitting device, the brightness of the light emitted by the second light emitting device and the brightness of the light emitted by the third light emitting device and perceived by the human eyes under the non-normal viewing angle tend to be consistent, and the color cast phenomenon of the white light under the normal viewing angle under the non-normal viewing angle is improved.
Drawings
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of another display panel provided in the embodiment of the present invention;
fig. 5 is a graph showing the attenuation curves of the first color light emitted from the first light emitting device, the second color light emitted from the second light emitting device, and the third color light emitted from the third light emitting device with increasing viewing angle according to the embodiment of the present invention;
FIG. 6 is a schematic diagram of another display panel according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
FIG. 8 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a display device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some structures related to the present invention are shown in the drawings, not all of them.
As described in the background art, the display panel in the prior art has a problem that white light displayed at a front viewing angle (a viewing angle when human eyes are perpendicular to a light emergent surface of the display panel) may show color shifts of different degrees under a non-front viewing angle condition, so that a display effect at the non-front viewing angle (a viewing angle when human eyes are not perpendicular to the light emergent surface of the display panel) is poor. The inventor has found that the above problem occurs because the conventional display panel generally includes three organic light emitting devices respectively emitting red light, green light and blue light, the white light is formed by mixing three colors of red light, green light and blue light, the luminance attenuation speed of the light with different colors is inconsistent with the increase of the viewing angle (the viewing angle of human eyes is gradually increased from the direction perpendicular to the display panel to the direction parallel to the light emitting surface of the display panel), and specifically, the luminance attenuation amplitude of a certain color of light is smaller than the luminance attenuation amplitude of the other two colors of light with the increase of the viewing angle. The viewing angle may be an angle between a line connecting the position of the eye and the position where the light is emitted from the display panel and a plane perpendicular to the light emitting surface of the display panel. For example, as the viewing angle increases, the luminance attenuation amplitude of the blue light is minimum, that is, the luminance attenuation of the blue light is slowest, so that the luminance of the blue light under the non-normal viewing angle is greater than the luminance of the red light and greater than the luminance of the green light, and the white picture under the normal viewing angle is bluish under the non-normal viewing angle; for another example, as the viewing angle increases, the red light is attenuated at the slowest, and the brightness of the red light under the non-normal viewing angle is greater than that of the blue light and greater than that of the green light, so that the white picture under the normal viewing angle is reddish under the non-normal viewing angle, and finally the white picture under the normal viewing angle is color-shifted under the non-normal viewing angle.
For the above reasons, an embodiment of the present invention provides a display panel, and fig. 1 is a schematic structural diagram of the display panel provided in the embodiment of the present invention, and referring to fig. 1, the display panel includes:
a substrate 110;
a plurality of light emitting devices disposed at one side of the substrate 110, the light emitting devices including a first light emitting device 121, a second light emitting device 122, and a third light emitting device 123 emitting different colors of light, respectively; under a non-normal viewing angle, the light emission luminance of the third light emitting device 123 is greater than the light emission luminance of the first light emitting device 121, and the light emission luminance of the third light emitting device 123 is greater than the light emission luminance of the second light emitting device 122;
a first light extraction layer 130 disposed on a side of the light emitting device away from the substrate 110;
a second light extraction layer 141 disposed on a side of the first light extraction layer 130 away from the substrate 110; in a direction perpendicular to the substrate 110, the second light extraction layer 141 covers only the third light emitting device 123;
wherein the refractive index of the second light extraction layer 141 is greater than the refractive index of the first light extraction layer 130.
In particular, the substrate 110 may provide cushioning, protection, or support for the display panel. The substrate 110 may be a flexible substrate 110, and the material of the flexible substrate 110 may be Polyimide (PI), polyethylene naphthalate (PEN), polyethylene terephthalate (PET), or the like, or may be a mixture of the foregoing materials. The substrate 110 may be a hard substrate 110 formed of glass or the like.
Optionally, the light emitting device includes an anode layer 150, a cathode layer 170, and a light emitting layer 160 between the anode layer 150 and the cathode layer 170, wherein the anode layer 150 is disposed on a side close to the substrate 110, and the cathode layer 170 is disposed on a side far from the substrate 110. Alternatively, the anode of the anode layer 150 is a total reflection electrode, i.e., a non-transmission electrode, the anode layer 150 may have a three-layer structure, wherein the first layer and the third layer may be metal oxide layers, such as Indium Tin Oxide (ITO), Indium Zinc Oxide (IZO), and Aluminum Zinc Oxide (AZO), and the middle second layer may be a metal layer (such as silver or copper). The cathode layer 170 is a semi-reflective electrode, and ITO or magnesium-aluminum alloy material can be used.
Optionally, the display panel further includes a pixel defining layer 180, the pixel defining layer 180 includes a plurality of openings, the openings of the pixel defining layer 180 include the light emitting layer 160, and the light emitting layer 160 may include only a single film layer, i.e., only a light emitting material layer; the organic el device may have a multilayer structure including a hole injection layer, a hole transport layer, a light emitting material layer, an electron transport layer, an electron injection layer, and the like, which are stacked in this order from the anode layer 150 to the cathode layer 170. Also, the light emitting layer 160 includes at least a red light emitting layer, a green light emitting layer, and a blue light emitting layer, and thus the first light emitting device 121, the second light emitting device 122, and the third light emitting device 123 emitting different colors of light may be formed.
In the embodiment of the present invention, the display panel further includes a first light extraction layer 130 disposed on a side of the light emitting device away from the substrate 110, and specifically, the first light extraction layer 130 may be disposed on a side of the cathode layer 170 away from the substrate 110. The first light extraction layer 130 may have a larger thickness to ensure that light emitted from the organic light emitting device can be extracted more outward, thereby improving the light extraction rate of the display panel. The display panel further includes a second light extraction layer 141 disposed on a side of the first light extraction layer 130 away from the substrate 110, and in a direction perpendicular to the substrate 110, the second light extraction layer 141 only covers the third light emitting device 123. As the viewing angle increases, the attenuation amplitudes of the light emitting luminances of the light emitting devices emitting light of different colors are inconsistent, so that the light emitting luminances of the first light emitting device 121, the second light emitting device 122 and the third light emitting device 123 are different under a non-normal viewing angle, wherein the light emitting luminance of the third light emitting device 123 is greater than the light emitting luminance of the first light emitting device 121 and the light emitting luminance of the third light emitting device 123 is greater than the light emitting luminance of the second light emitting device 122 under the non-normal viewing angle, so that color cast occurs in different degrees under the non-normal viewing angle. For example, when the colors of the light emitted from the first light emitting device 121, the second light emitting device 122, and the third light emitting device 123 are red light, green light, and blue light, respectively, white light in a front viewing angle may be bluish in a non-front viewing angle. In the embodiment of the present invention, the attenuation width of the light emission luminance of the third light emitting device 123 is the smallest as the viewing angle increases, that is, the light emission luminance of the third light emitting device 123 is the slowest to attenuate as the viewing angle increases. Therefore, in the direction perpendicular to the substrate 110, the second light extraction layer 141 only covers the third light emitting device 123, and the refractive index of the second light extraction layer 141 is greater than that of the first light extraction layer 130, so that after light emitted by the third light emitting device 123 is emitted and refracted through the second light extraction layer 141, the propagation direction is changed, specifically, the included angle between the light emitted by the third light emitting device 123 and the direction perpendicular to the light emitting surface of the display panel is reduced, and correspondingly, light emitted by the third light emitting device 123 entering human eyes under a non-normal viewing angle is reduced, so that the brightness of the light emitted by the third light emitting device 123 perceived by human eyes under the non-normal viewing angle is reduced; in the direction perpendicular to the substrate 110, the second light extraction layer 141 does not cover the first light emitting device 121 and the second light emitting device 122, so that the light emitted by the first light emitting device 121 and the second light emitting device 122 directly exits after passing through the first light extraction layer 130; the light emitted by the first light emitting device 121 and received by the human eye under the non-normal viewing angle is more than the light emitted by the third light emitting device 123, and the light emitted by the second light emitting device 122 and received by the human eye under the non-normal viewing angle is more, so that the brightness of the light emitted by the first light emitting device 121, the second light emitting device 122 and the third light emitting device 123 and perceived by the human eye under the non-normal viewing angle tends to be consistent, and the color cast phenomenon of the white light under the normal viewing angle under the non-normal viewing angle is further improved.
It should be noted that, in the display panel in the embodiment of the invention, the second light extraction layer 141 may have a thinner thickness than the first light extraction layer 130, and since the first light extraction layer 130 may function to extract more light emitted by each light emitting device, the second light extraction layer 141 may mainly function to change the propagation direction of light instead of extracting more light, specifically, an included angle between the light passing through the second light extraction layer 141 and a direction perpendicular to the light exit surface of the display panel is reduced.
According to the display panel provided by the embodiment of the invention, the display panel comprises a plurality of light-emitting devices, wherein each light-emitting device comprises a first light-emitting device, a second light-emitting device and a third light-emitting device which respectively emit light with different colors; under a non-normal viewing angle, the light-emitting brightness of the third light-emitting device is greater than that of the first light-emitting device, and the light-emitting brightness of the third light-emitting device is greater than that of the second light-emitting device; and a second light extraction layer covering only the third light emitting device in a direction perpendicular to the substrate; the refractive index of the second light extraction layer is greater than that of the first light extraction layer, so that the included angle between the light emitted by the third light emitting device and the direction perpendicular to the light emitting surface of the display panel is reduced after the light emitted by the third light emitting device is emitted and refracted by the second light extraction layer, and correspondingly, the light emitted by the third light emitting device which is emitted into human eyes under a non-normal viewing angle is reduced; the light rays emitted by the first light emitting device and the second light emitting device are directly emitted after passing through the first light extraction layer; the light emitted by the first light emitting device and received by the human eyes under the non-normal viewing angle is more than the light emitted by the third light emitting device, the light emitted by the second light emitting device and received by the human eyes under the non-normal viewing angle is more than the light emitted by the third light emitting device, the brightness of the light emitted by the third light emitting device and perceived by the human eyes under the non-normal viewing angle is reduced, the brightness of the light emitted by the first light emitting device, the brightness of the light emitted by the second light emitting device and the brightness of the light emitted by the third light emitting device and perceived by the human eyes under the non-normal viewing angle tend to be consistent, and the color cast phenomenon of the white light under the normal viewing angle under the non-normal viewing angle is improved.
Fig. 2 is a schematic structural diagram of another display panel provided in an embodiment of the present invention, and referring to fig. 2, the display panel optionally further includes a third light extraction layer 142, where the third light extraction layer 142 is in the same layer as the second light extraction layer 141; the third light extraction layer 142 includes a base material doped with metal particles 1421, and the third light extraction layer 142 covers the first and second light emitting devices 121 and 122 in a direction perpendicular to the substrate 110.
The base material of the third light extraction layer 142 may be an organic material, specifically, the organic material has a higher refractive index and a higher light extraction efficiency, and it can be ensured that the light emitted by the first light emitting device 121 and the second light emitting device 122 still has a higher light extraction rate after passing through the third light extraction layer 142. Moreover, the base material is doped with the metal particles 1421, so that after light emitted by the first light emitting device 121 and the second light emitting device 122 enters the third light extraction layer 142, the light emitted to the metal particles 1421 is reflected to change the propagation direction, and the light reflected by one metal particle 1421 may be emitted to another metal particle 1421, so that after passing through the third light extraction layer 142, the light emitted by the first light emitting device 121 and the second light emitting device 122 in a specific propagation direction is scattered in different directions to be emitted out of the third light extraction layer 142, and finally, the light emitted by the first light emitting device 121 and the light emitted by the second light emitting device 122 under a non-normal viewing angle are increased, so that the brightness of the light emitted by the first light emitting device 121 and the second light emitting device 122, which is sensed by human eyes, is increased, and further, the brightness of the light emitted by the first light emitting device 121, the second light emitting device 122 and the third light emitting device 123, which is sensed by human eyes, under a non-normal viewing angle is more consistent, the phenomenon that white light under the normal viewing angle shows color cast at a non-normal viewing angle is further improved, and the display effect is improved.
It should be noted that, in order to ensure the light extraction efficiency of the light emitted from the first light emitting device 121 and the second light emitting device 122, the doping concentration of the metal particles 1421 is not too high.
Fig. 3 is a schematic structural diagram of another display panel provided in an embodiment of the present invention, and referring to fig. 3, optionally, the display panel further includes a fourth light extraction layer 143, where the fourth light extraction layer 143 is in the same layer as the second light extraction layer 141; the fourth light extraction layer 143 covers the first and second light emitting devices 121 and 122 in a direction perpendicular to the substrate 110, and the refractive index of the fourth light extraction layer 143 is smaller than that of the first light extraction layer 130.
Referring to fig. 3, specifically, in a direction perpendicular to the substrate 110, the fourth light extraction layer 143 covers the first light emitting device 121 and the second light emitting device 122, so that light emitted by the first light emitting device 121 and the second light emitting device 122 is emitted from the first light extraction layer 130, and after the light enters the second light extraction layer 141 and is refracted, an included angle between a refracted light ray emitted from the second light extraction layer 141 and a direction perpendicular to the light emitting surface of the display panel is increased, so that light emitted by the first light emitting device 121 and light emitted by the second light emitting device 122 that can enter human eyes under a non-normal viewing angle are increased, luminance of light emitted by the first light emitting device 121 and the second light emitting device 122 that is perceived by human eyes is increased, further, luminance of the first light emitting device 121, the second light emitting device 122 and the third light emitting device 123 under the non-normal viewing angle is more consistent, and a phenomenon that white light under the normal viewing angle shows color cast is further improved, the display effect is improved.
On the basis of the above scheme, optionally, the light emitting colors of the first light emitting device 121, the second light emitting device 122, and the third light emitting device 123 are red light, green light, and blue light, respectively.
Specifically, since the light emitting characteristics of the red light, the green light, and the blue light are different, specifically, the luminance of the blue light emitted by the third light emitting device 123 is attenuated slowest with the increase of the viewing angle in the existing partial display panel, which causes a problem that the white light at the front viewing angle is blue at a non-front viewing angle. Therefore, with the display panel structure shown in fig. 1 in the above embodiment, in the direction perpendicular to the substrate 110, the second light extraction layer 141 covers the third light emitting device 123, and the refractive index of the second light extraction layer 141 is greater than the refractive index of the first light extraction layer 130, so that after blue light emitted by the third light emitting device 123 is emitted and refracted by the second light extraction layer 141, an included angle between the blue light and the direction perpendicular to the light emitting surface of the display panel becomes smaller, accordingly, the blue light incident into human eyes under a non-normal viewing angle becomes smaller, and red light and green light entering human eyes remain unchanged, so that the luminances of red light, green light and blue light perceived by human eyes under the non-normal viewing angle tend to be consistent, and further, the phenomenon that white light under the normal viewing angle shows bluish in the non-normal viewing angle can be improved. Similarly, by adopting the display panel structure shown in fig. 2 or fig. 3, the light emission quantity of red light and green light under a non-normal viewing angle can be increased, so that the brightness of red light, green light and blue light perceived by people under the non-normal viewing angle is more consistent, the red light, green light and blue light cannot be blue after being mixed under the non-normal viewing angle, and the red light, green light and blue light are closer to white light under the normal viewing angle, and the problem that the white light under the normal viewing angle is blue under the non-normal viewing angle is further improved.
Fig. 4 is a schematic structural diagram of another display panel provided in an embodiment of the present invention, and referring to fig. 4, the display panel further includes a first light absorbing layer 191 covering the third light emitting device 123 in a direction perpendicular to the substrate 110, the first light absorbing layer 191 is disposed on a side of the second light extraction layer 141 away from the substrate 110, and the first light absorbing layer 191 is configured to absorb a portion of light emitted by the third light emitting device 123.
Specifically, the first light absorption layer 191 may be a filter that emits light of the same color as the third light emitting device 123. At a non-normal viewing angle, the brightness of the light emitted from the third light emitting device 123 is greater than that of the light emitted from the first light emitting device 121, and the brightness of the light emitted from the third light emitting device 123 is greater than that of the light emitted from the second light emitting device 122. By arranging the display panel to include the first light absorbing layer 191 covering the third light emitting device 123 in the direction perpendicular to the substrate 110, the first light absorbing layer 191 can absorb part of the light emitted by the third light emitting device 123, so that the light emitted from the light absorbing layer is reduced after the light emitted by the third light emitting device 123 passes through the light absorbing layer, and further, the human eye can perceive that the luminance of the third light emitting device 123, the luminance of the light emitted by the first light emitting device 121, and the luminance of the light emitted by the second light emitting device 122 tend to be consistent under a non-normal viewing angle, so that the light emitted by the first light emitting device 121, the light emitted by the second light emitting device 122, and the light emitted by the third light emitting device 123 are mixed and then do not deviate to the light emitting color of a certain light emitting device under the non-normal viewing angle, and the color of the display surface observed under the non-normal viewing angle is close to the color of the display surface observed under the normal viewing angle, thereby improving the color cast problem under the non-normal viewing angle. Optionally, the light absorption degree of the first light absorption layer 191 is different at different light emitting angles; preferably, the first light absorption layer 191 has the lowest light absorption degree or no light absorption effect at a front viewing angle, and the first light absorption layer 191 has the lowest light absorption degree or no light absorption effect at the front viewing angle because the display panel can normally display at the front viewing angle and further there is no need to absorb light emitted from the third light emitting device 123. Under a non-normal viewing angle, the larger the luminance difference between the third light emitting device 123 and the first light emitting device 121 and/or the larger the luminance difference between the third light emitting device 123 and the second light emitting device 122, the stronger the light absorption degree of the first light absorption layer 191, so that it can be ensured that the luminance of the light emitted by the first light emitting device 121, the second light emitting device 122, and the third light emitting device 123, which is perceived by human eyes, is relatively consistent under each viewing angle, and further, the color cast phenomenon under the non-normal viewing angle is improved.
Alternatively, the larger the luminance difference between the third light emitting device 123 and the first light emitting device 121, and/or the luminance difference between the third light emitting device 123 and the second light emitting device 122 at the same light emitting angle, the thicker the thickness of the first light absorbing layer 191 at the light emitting angle position.
The same light-emitting angle means that the light-emitting angles of the light rays emitted by the first light-emitting device 121, the second light-emitting device 122 and the third light-emitting device 123 are the same, and each light-emitting angle may correspond to one viewing angle. Specifically, the greater the thickness of the first light-absorbing layer 191, the greater the light-absorbing ability. By setting the luminance difference value between the third light emitting device 123 and the first light emitting device 121 and/or the thickness of the first light absorbing layer 191 at the light emitting angle position to be thicker as the luminance difference value between the third light emitting device 123 and the second light emitting device 122 is larger under the same light emitting angle, the light emitted by the third light emitting device 123 is more absorbed by the first light absorbing layer 191 at the light emitting angle position where the luminance difference value between the third light emitting device 123 and other light emitting devices (the first light emitting device 121 and the second light emitting device 122) is larger, and the luminance difference value between the third light emitting device 123 and other light emitting devices is further reduced or even eliminated, so that the luminance of the light emitted by the first light emitting device 121, the second light emitting device 122 and the third light emitting device 123 is closer under each light emitting angle, and the color cast phenomenon is further improved.
Fig. 5 is a graph showing the attenuation curves of the first color light emitted from the first light emitting device, the second color light emitted from the second light emitting device, and the third color light emitted from the third light emitting device with increasing viewing angle according to the embodiment of the present invention. Fig. 6 is a schematic structural diagram of another display panel according to an embodiment of the present invention. Referring to fig. 5 and 6, in which the attenuation curve 210 of the first color light emitted by the first light emitting device 121 increases with the viewing angle, the attenuation curve 220 of the second color light emitted by the second light emitting device 122 increases with the viewing angle, and the attenuation curve 230 of the third color light emitted by the third light emitting device 123 increases with the viewing angle have the attenuation trend shown in fig. 6, and the mixed curve of the first color light 210, the second color light 220, and the third color light 230 is 240; referring to fig. 6, in which the difference in luminance between the third light emitting device 123 and the first light emitting device 121 is the largest at a viewing angle of 30 degrees; and the difference in luminance between the third light emitting device 123 and the second light emitting device 122 is the largest at a viewing angle of 30 degrees; the brightness difference between the third light emitting device 123 and the first light emitting device 121 and/or the brightness difference between the third light emitting device 123 and the second light emitting device 122 gradually decrease from a 30-degree viewing angle to a 0-degree viewing angle, and from a 30-degree viewing angle to a 60-degree viewing angle, so that the thickness of the first light absorbing layer 191 at the position corresponding to the 30-degree viewing angle can be set to be the thickest, and the thickness of the first light absorbing layer 191 gradually decreases from the 30-degree viewing angle to the 0-degree viewing angle, and from the 30-degree viewing angle to the 60-degree viewing angle to a 90-degree viewing angle, referring to the structure of the first light absorbing layer 191 shown in fig. 6, thereby ensuring that the light emitting luminances of the first light emitting device 121, the second light emitting device 122, and the third light emitting device 123 are relatively close to each other at each viewing angle, and further improving the color shift phenomenon at non-normal viewing angles.
Fig. 7 is a schematic structural diagram of another display panel according to an embodiment of the present invention, referring to fig. 7, the structure of the first light absorbing layer 191 may also include a first portion with uniform thickness corresponding to most of the light emitting areas of the third light emitting device 123, and a second portion 1912 and a third portion 1913 with non-uniform thickness located at two sides of the first portion 1911, where the thickness of the first portion 1911 is smaller than the minimum thickness of the second portion 1912, and the thickness of the first portion 1911 is smaller than the minimum thickness of the third portion 1913, so as to ensure that the light emitted in a direction perpendicular to the substrate 110 is less absorbed, i.e., to ensure that the display effect is better at a positive viewing angle. And light rays under a non-normal viewing angle are absorbed by the second portion 1912 and the third portion 1913 to different degrees, and where the difference in luminance between the third light emitting device 123 and the first light emitting device 121 and/or the difference in luminance between the third light emitting device 123 and the second light emitting device 122 is larger, the thicker the thicknesses of the second portion 1912 and the third portion 1913 are, the color shift under the non-normal viewing angle can be improved.
Fig. 8 is a schematic structural diagram of another display panel according to an embodiment of the present invention, and referring to fig. 8, the display panel further includes a second light absorbing layer 192 covering the first light emitting device 121 in a direction perpendicular to the substrate 110, and/or a third light absorbing layer 193 covering the second light emitting device 122 in a direction perpendicular to the substrate 110, the second light absorbing layer 192 is used for absorbing a portion of light emitted from the first light emitting device 121, the second light absorbing layer 192 is used for absorbing a portion of light emitted from the second light emitting device 122, and the second light absorbing layer 192 absorbs less light emitted from the first light emitting device 121 than the third light emitting device 123 absorbed by the first light absorbing layer 191, and the third light absorbing layer 193 absorbs less light emitted from the second light emitting device 122 than the third light emitting device 123 absorbed by the first light absorbing layer 191.
Alternatively, the second light absorbing layer 192 may be a filter having the same light emitting color as the first light emitting device 121, and the third light absorbing layer 193 may be a filter having the same light emitting color as the second light emitting device 122. Illustratively, when only the first light absorbing layer 191 covering the third light emitting device 123 is provided, light absorbed by the first light absorbing layer 191 cannot correspond to both the difference between the light emission luminance of the third light emitting device 123 and the light emission luminance of the first light emitting device 121 and the difference between the light emission luminance of the third light emitting device 123 and the light emission luminance of the second light emitting device 122, that is, can be set only in thickness according to either one of them, and thus the effect of improving color shift is limited. After the second light absorbing layer 192 and the third light absorbing layer 193 are disposed, the second light absorbing layer 192 can absorb part of the light emitted from the first light emitting device 121, the third light absorbing layer 193 can absorb part of the light emitted from the second light emitting device 122, and the second light absorbing layer 192 can absorb part of the light emitted from the first light emitting device 121 and/or the third light absorbing layer 193 can absorb part of the light emitted from the second light emitting device 122, so that the luminance of the light emitted from the first light emitting device 121, the second light emitting device 122 and the third light emitting device 123 under the non-normal viewing angle can be more approximately consistent, and the color shift can be further improved.
It should be noted that the shape of the second light absorption layer 192 may be set according to the difference between the luminance of the third light emitting device 123 and the luminance of the first light emitting device 121 at different viewing angles, and the shape of the third light absorption layer 193 may also be set according to the difference between the luminance of the third light emitting device 123 and the luminance of the second light emitting device 122 at different viewing angles, which is not specifically limited herein.
On the basis of the above scheme, optionally, the light emitting colors of the first light emitting device 121, the second light emitting device 122, and the third light emitting device 123 are blue light, green light, and red light, respectively.
Specifically, for example, to improve the display effect of the display panel, the color gamut of the existing display panel is wider and wider, and in order to improve the color purity, the microcavity effect is strengthened. In the existing wide color gamut display panel, there is a problem that a white picture in a front view angle is reddish, because red light emitted by the third light emitting device 123 is attenuated slowest as a viewing angle becomes larger, so that human eyes perceive that the brightness of red light is greater than that of green light and is also greater than that of blue light in a non-front view angle. By arranging the first light absorbing layer 191 on the third light emitting device 123 emitting red light, a part of red light can be absorbed, so that the brightness of red light perceived by human eyes is closer to the brightness of green light and closer to the brightness of blue light under a non-front viewing angle, and the problem that white light under the front viewing angle is reddish under the non-front viewing angle is solved.
With continuing reference to fig. 6 and 7, based on the above solution, optionally, the display panel further includes an encapsulation layer 310, and the encapsulation layer 310 is disposed between the second light extraction layer 141 and the first light absorption layer 191; an optically transparent glue 320 is arranged between the first light absorbing layer 191 and the encapsulation layer 310.
Specifically, referring to fig. 6 and 7, the package, 210, may package the first light emitting device 121, the second light emitting device 122, the third light emitting device 123, and the first and second light extraction layers 130 and 141; when the display panel includes the third light extraction layer and the fourth light extraction layer, the encapsulation layer 310 encapsulates the third light extraction layer and the third light extraction layer therein as well. The light emitting device and the light extraction layer are very sensitive to water and oxygen, and the service life of the display panel is greatly influenced after the water and the oxygen invade the display panel and react with the light emitting device. In the display panel provided by this embodiment, the second light extraction layer 141 and the first light extraction layer 130 are disposed on the side of the encapsulation layer 310 away from the substrate 110, where the encapsulation layer 310 may be a flexible encapsulation layer, such as a thin film encapsulation; the light-emitting device can be packaged in a closed space, so that water and oxygen are prevented from invading, and the service life of the display panel is prolonged. An optically transparent adhesive 320 is disposed between the first light-absorbing layer 191 and the encapsulation layer 310, and further fixes the first light-absorbing layer 191. Since the optically transparent adhesive 320 has a certain plasticity, it can be well fixed to the encapsulation layer 310 even when the light absorbing layer has a shape with different thickness as shown in fig. 6 and 7.
Fig. 9 is a schematic structural diagram of a display device according to an embodiment of the present invention, and referring to fig. 9, the display device 10 includes the display panel 100 according to any embodiment of the present invention. The display device may be a mobile phone as shown in fig. 9, or may be a computer, a television, an intelligent wearable display device, and the like, which is not particularly limited in this embodiment of the present invention.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (5)
1. A display panel, comprising:
a substrate;
a plurality of light emitting devices disposed at one side of the substrate, the plurality of light emitting devices including a first light emitting device, a second light emitting device, and a third light emitting device that emit light of different colors, respectively; under a non-positive viewing angle, the light-emitting brightness of the third light-emitting device is greater than that of the first light-emitting device, and the light-emitting brightness of the third light-emitting device is greater than that of the second light-emitting device;
the first light extraction layer is arranged on one side, away from the substrate, of the plurality of light-emitting devices;
the second light extraction layer is arranged on one side, far away from the substrate, of the first light extraction layer; in the direction perpendicular to the substrate, the second light extraction layer covers only the third light emitting device; wherein a refractive index of the second light extraction layer is greater than a refractive index of the first light extraction layer, and a thickness of the second light extraction layer is less than a thickness of the first light extraction layer;
and a first light absorbing layer covering the third light emitting device in a direction perpendicular to the substrate, the first light absorbing layer being disposed on a side of the second light extraction layer away from the substrate, the first light absorbing layer being configured to absorb a portion of light emitted by the third light emitting device, wherein under the same light emission angle, the larger a luminance difference between the third light emitting device and the first light emitting device is, and/or the larger a luminance difference between the third light emitting device and the second light emitting device is, the thicker a thickness of the first light absorbing layer at the light emission angle position is.
2. The display panel according to claim 1, further comprising a second light absorbing layer covering the first light emitting device in a direction perpendicular to the substrate, and/or a third light absorbing layer covering the second light emitting device in a direction perpendicular to the substrate, wherein the second light absorbing layer is configured to absorb a portion of light emitted from the first light emitting device, the third light absorbing layer is configured to absorb a portion of light emitted from the second light emitting device, and the second light absorbing layer absorbs less light emitted from the first light emitting device than the first light absorbing layer, and the third light absorbing layer absorbs less light emitted from the second light emitting device than the first light absorbing layer.
3. The display panel according to any one of claims 1 to 2, wherein the emission colors of the first light-emitting device, the second light-emitting device, and the third light-emitting device are blue light, green light, and red light, respectively.
4. The display panel according to claim 1, further comprising an encapsulation layer provided between the second light extraction layer and the first light absorption layer; an optical transparent adhesive is arranged between the first light absorption layer and the packaging layer.
5. A display device characterized by comprising the display panel according to any one of claims 1 to 4.
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| CN111653681A (en) * | 2020-02-28 | 2020-09-11 | 京东方科技集团股份有限公司 | Optical spacer and display panel |
| CN111628107B (en) * | 2020-06-08 | 2023-05-02 | 合肥维信诺科技有限公司 | Display panel |
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| CN206148474U (en) * | 2016-09-19 | 2017-05-03 | 张家港康得新光电材料有限公司 | Take out structure of membrane and use thereof |
| CN106449703A (en) * | 2016-10-09 | 2017-02-22 | Tcl集团股份有限公司 | OLED (Organic Light Emitting Diode) display panel and fabrication method |
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