CN110707146B - Cover plate, organic light-emitting display panel and display device - Google Patents
Cover plate, organic light-emitting display panel and display device Download PDFInfo
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- CN110707146B CN110707146B CN201911155508.8A CN201911155508A CN110707146B CN 110707146 B CN110707146 B CN 110707146B CN 201911155508 A CN201911155508 A CN 201911155508A CN 110707146 B CN110707146 B CN 110707146B
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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
- H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
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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
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
Abstract
The invention discloses a cover plate, an organic light-emitting display panel and a display device. Specifically, the present invention provides a cover plate for an organic light emitting display device, including: the light source comprises a substrate, a light source and a light source, wherein the substrate is provided with a plurality of light emitting units limited by a light shielding structure and provided with a light incident surface and a light emitting surface; at least part of the light emitting units are provided with colored conversion layers, and the colored conversion layers are arranged on the light incident surface of the substrate; the light modulation layer is arranged on one side, far away from the substrate, of the color conversion layer and is configured to enable incident light to penetrate through the color conversion layer and the substrate and to be emitted from the light emitting surface of the substrate. Therefore, the light modulation layer can adjust the light emitting direction of the incident light, and the incident light can be emitted from the light emitting surface, so that the light emitting efficiency of the organic light emitting display panel can be improved, the power consumption is reduced, and the display quality is improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a cover plate, an organic light-emitting display panel and a display device.
Background
Organic electroluminescence (OLED) display technology has become a research hotspot in the field of optoelectronic display technology due to its advantages of self-luminescence, wide viewing angle, high contrast, low power consumption, extremely high response speed, ultra-light and thin weight, flexible display, rollable screen, strong temperature adaptability, simple manufacturing process, etc. When the existing OLED device realizes full-color display, some methods respectively prepare a light-emitting layer capable of emitting red light, a light-emitting layer capable of emitting green light and a light-emitting layer capable of emitting blue light by using a fine metal mask, and the method has the advantages of complex manufacturing process, high process precision requirement and difficulty in realizing stable mass production of large-size OLED devices. Other methods adopt a mode of adding a color filter into a white light OLED to manufacture a large-size OLED device, but the OLED device manufactured by the method has great defects in power consumption and color gamut. The full-color display of the OLED device is realized by adopting the blue OLED color-adding conversion layer, so that the power consumption can be reduced to a certain extent, the color gamut can be improved, and the display quality can be improved.
However, the cover plate for the organic light emitting display panel, and the display device are still to be improved.
Disclosure of Invention
The present invention is based on the discovery and recognition by the inventors of the following facts and problems:
the inventor finds that the OLED device manufactured by adopting the blue OLED additive color conversion layer still has the problems of low light-emitting efficiency, high power consumption, poor color gamut and the like. The OLED device manufactured by the blue OLED color conversion layer comprises the following structures: the organic light emitting display panel (OLED device) comprises an organic light emitting display back plate and an organic light emitting display cover plate which are oppositely arranged, wherein a light emitting unit is arranged in the back plate, light emitting layers in the light emitting unit can be formed by blue light emitting materials, blue light emitted by the light emitting layers can be incident into the cover plate, a light emitting unit is arranged in the cover plate, a color conversion layer is arranged in part of the light emitting unit, for example, a red light color conversion layer and a green light color conversion layer can be arranged in the light emitting unit, the red light color conversion layer and the green light color conversion layer can respectively convert the incident blue light into red light and green light, therefore, light emitted from a light emitting surface of the cover plate comprises red light, green light and blue light, and full color display can be realized. The current commonly used color conversion layer material is usually a quantum dot material, the quantum dot material can not only convert incident blue light into red light or green light, but also change the direction of incident light, and the light entering the color conversion layer can be emitted in various directions, for example, part of the light entering the color conversion layer can be emitted along the side wall of the color conversion layer or along the direction opposite to the incident light direction, so that the color conversion efficiency of the color conversion layer is low, and the light finally emitted from the light emitting surface of the cover plate is less, the light emitting efficiency is low, the power consumption is high, and the color gamut is poor. Therefore, if a new cover plate for an organic light emitting display panel is provided, the proportion of light emitted from the light emitting surface of the cover plate can be increased, the light emitting efficiency of the organic light emitting display panel can be better improved, the power consumption can be reduced, the display quality can be improved, and the above problems can be solved to a great extent.
In one aspect of the present invention, a cover plate for an organic light emitting display device is provided. According to an embodiment of the present invention, the cap plate includes: the light source comprises a substrate, a light source and a light source, wherein the substrate is provided with a plurality of light emitting units limited by a light shielding structure and is provided with a light incident surface and a light emitting surface; at least part of the light emitting units are provided with colored conversion layers, and the colored conversion layers are arranged on the light incident surface of the substrate; the light modulation layer is arranged on one side, far away from the substrate, of the color conversion layer and is configured to enable incident light to penetrate through the color conversion layer and the substrate and to be emitted from the light emitting surface of the substrate. Therefore, the light modulation layer can adjust the light emitting direction of the incident light, and the incident light can be emitted from the light emitting surface, so that the light emitting efficiency of the organic light emitting display panel can be improved, the power consumption is reduced, and the display quality is improved.
According to an embodiment of the invention, the material forming the light modulation layer comprises a photonic crystal. Therefore, when the material is used for forming the light modulation layer, the transmission or reflection performance and the like of light can be conveniently regulated and controlled, the emergent direction of the light is convenient to regulate, the light emergent in the direction opposite to the incident direction is reduced, the proportion of the light emergent from the emergent surface is further improved, and the light emergent efficiency of the organic light-emitting display panel is improved.
According to an embodiment of the invention, the light modulation layer comprises a first modulation sublayer and a second modulation sublayer arranged in a stacked manner, the first modulation sublayer being arranged away from the color conversion layer, the first modulation sublayer having a continuously arranged first relief structure, the second modulation sublayer having a second relief structure complementary to the first modulation sublayer, wherein a refractive index of the first modulation sublayer is smaller than a refractive index of the second modulation sublayer. Therefore, when the light entering the cover plate is irradiated to the light modulation layer and is irradiated to the interface between the second modulation sublayer and the first modulation sublayer, the light can be totally reflected at the interface because the refractive index of the first modulation sublayer is smaller than that of the second modulation sublayer, and then the light can be reflected back to the inside of the optical modulation layer, so that the light emitted in the direction opposite to the incident light direction can be reduced, the proportion of the light emitted from the light emitting surface is further improved, and the light emitting efficiency of the organic light emitting display panel is improved.
According to an embodiment of the present invention, the light modulation layer includes a plurality of medium sub-layers arranged in a stacked manner, and refractive indexes of adjacent two medium sub-layers are different. Therefore, through the plurality of medium sub-layers with different refractive indexes, the emergent direction of light rays entering the cover plate can be simply and conveniently adjusted, the light rays emergent in the direction opposite to the incident direction can be reduced, the proportion of the light rays emergent from the emergent surface is further improved, and the light-emitting efficiency of the organic light-emitting display panel is improved.
According to an embodiment of the invention, the total number of layers of the medium sublayer is 3-10 and the thickness of the light modulation layer is 0.5-10 μm. Therefore, the proportion of the light rays emitted from the light emitting surface is further improved, and the light emitting efficiency of the organic light emitting display panel is improved.
According to the embodiment of the invention, the light emitting unit comprises a red light emitting unit, a green light emitting unit and a blue light emitting unit, the red light emitting unit and the green light emitting unit are provided with the color conversion layers, the red light emitting unit is provided with a red light quantum dot color conversion layer, and a red light filter is arranged between the red light quantum dot color conversion layer and the substrate; a green light quantum dot color conversion layer is arranged in the green light emitting unit, and a green light filter is arranged between the green light quantum dot color conversion layer and the substrate; the light shading structure comprises a light source, a blue light emitting unit and a light shading structure, wherein the blue light emitting unit is internally provided with a blue light modulation layer, a planarization layer is arranged between the blue light modulation layer and the substrate, the light shading structure comprises a black matrix, and the light modulation layer covers all surfaces of the red light quantum dot color conversion layer, the green light quantum dot color conversion layer, the blue light modulation layer and the black matrix. Therefore, the light modulation layer can adjust the light emitting direction of the incident light, and the incident light can be emitted from the light emitting surface, so that the light emitting efficiency of the organic light emitting display panel can be improved, the power consumption is reduced, and the display quality is improved; in addition, this blue light modulation layer can adjust the blue light-emitting direction in the blue light luminescence unit, and this blue light modulation layer can be broken up the blue light of incidence promptly, and then can avoid the light-emitting direction of blue light too concentrate the narrower scheduling problem of display visual angle that leads to.
According to an embodiment of the present invention, the blue light modulation layer includes one or more blue light modulation sub-layers, the blue light modulation sub-layers include a matrix and microparticles, refractive indices of the matrix and the microparticles are different, a thickness of the blue light modulation sub-layer is 1 to 50 μm, an equivalent size of the microparticles is 0.025 to 5 μm, and a volume ratio of the microparticles to the matrix in the blue light modulation sub-layer is 1: (1.25-20). Therefore, the blue light modulation layer can well adjust the light emitting direction of the blue light which is incident into the blue light emitting unit, the blue light can be emitted along each angle of the light emitting surface, and the display performance and the display quality are further improved.
In another aspect of the present invention, an organic light emitting display panel is provided. According to an embodiment of the present invention, the organic light emitting display panel includes: the organic light emitting display device comprises an organic light emitting display cover plate and an organic light emitting display back plate which are oppositely arranged, wherein the organic light emitting display cover plate is the cover plate for the organic light emitting display device, a light modulation layer of the organic light emitting display cover plate is arranged towards the organic light emitting display back plate, and the organic light emitting display back plate comprises: the substrate, have a plurality of luminescence units that pixel definition layer injectd on the substrate, the inside of luminescence unit has first electrode layer, luminescent layer and the second electrode layer that stacks gradually the setting, luminescence unit with in the organic light emitting display apron the luminescence unit one-to-one sets up. Therefore, the organic light emitting display panel has all the features and advantages of the organic light emitting display cover plate described above, and will not be described herein again. Generally, the organic light-emitting display panel has high light-emitting efficiency, low power consumption and good display performance.
According to an embodiment of the present invention, a material forming the light emitting layer includes a blue light emitting material. Therefore, the service performance of the organic light-emitting display panel is further improved.
In yet another aspect of the present invention, a display device is provided. According to an embodiment of the present invention, the display device includes the organic light emitting display panel described above. Therefore, the display device has all the features and advantages of the organic light emitting display panel, which are not described herein again. In general, the display device has low power consumption and good display performance.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 shows a schematic structural view of a cover plate for an organic light emitting display panel according to an embodiment of the present invention;
fig. 2 is a schematic view illustrating a structure of a cover plate for an organic light emitting display panel according to another embodiment of the present invention;
FIG. 3 shows a schematic structure of a light modulation layer according to an embodiment of the present invention;
fig. 4 is a schematic view illustrating a partial structure of a cover plate for an organic light emitting display panel according to an embodiment of the present invention;
fig. 5 is a schematic structural view illustrating a cover plate for an organic light emitting display panel according to still another embodiment of the present invention;
fig. 6 shows a schematic structural view of an organic light emitting display panel according to an embodiment of the present invention; and
fig. 7 shows a schematic view of the structure of the organic light emitting display cover plate in comparative example 1.
Description of reference numerals:
100: a substrate; 10: a light incident surface; 20: a light-emitting surface; 110: a light emitting unit; 200: a light shielding structure; 300: a color conversion layer; 310: a red quantum dot color conversion layer; 320: a green quantum dot color conversion layer; 330: a blue light modulation layer; 400: a light modulation layer; 410: a first modulation sublayer; 420: a second modulation sublayer; 430: a first medium sublayer; 440: a second sub-medium layer; 450: a third medium sublayer; 510: a red filter; 520: a green filter; 530: a planarization layer; 600: a color conversion layer encapsulation structure; 700: a substrate; 710: a light emitting unit; 800: a pixel defining layer; 910: a first electrode layer; 920: a light emitting layer; 930: a second electrode layer; 1000: a cover plate; 1100: an organic light emitting display backplane; 1200: an organic light emitting display panel.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In one aspect of the present invention, a cover plate for an organic light emitting display device is provided. According to an embodiment of the present invention, referring to fig. 1, the cap plate 1000 includes: the light modulation device comprises a substrate 100, a light shielding structure 200, a color conversion layer 300 and a light modulation layer 400, wherein the substrate 100 is provided with a plurality of light emitting units 110 defined by the light shielding structure 200, and the substrate 100 is provided with a light incident surface 10 and a light emitting surface 20; at least part of the light emitting units 110 are provided with a color conversion layer 300, and the color conversion layer 300 is arranged on the light incident surface 10 of the substrate 100; the light modulation layer 400 is disposed on a side of the color conversion layer 300 away from the substrate 100, and the light modulation layer 400 is configured to allow incident light to pass through the color conversion layer 300 and the substrate 100 and to exit from the light exit surface 20 of the substrate 100. Therefore, the light modulation layer 400 can adjust the light emitting direction of the incident light, and the incident light can be emitted from the light emitting surface 20, thereby improving the light emitting efficiency of the organic light emitting display panel using the cover plate 1000, reducing the power consumption, and improving the display quality.
For convenience of understanding, the following briefly explains a principle by which the cover plate for an organic light emitting display device according to an embodiment of the present invention can achieve the above-described advantageous effects:
as mentioned above, in the OLED device manufactured by using the blue OLED color conversion layer, since the quantum dot material in the color conversion layer changes the emitting direction of the incident light, the light entering the color conversion layer can be emitted in all directions, and a part of the light entering the color conversion layer can be emitted along the side wall of the color conversion layer or along the direction opposite to the incident light direction, so that the color conversion efficiency of the color conversion layer is low, and the light finally emitted from the light emitting surface of the cover plate is less, the light emitting efficiency is low, the power consumption is high, and the color gamut is poor. In the cover plate 1000 for the organic light emitting display device according to the embodiment of the invention, the light modulation layer 400 is disposed on the side of the color conversion layer 300 away from the substrate 100, and the light modulation layer 400 can adjust the light emitting direction of the incident light, so that the incident light passes through the color conversion layer 300 and the substrate 100 and is emitted from the light emitting surface 20 of the substrate 100. Specifically, referring to fig. 1, the dotted lines and arrows in fig. 1 indicate the propagation direction of light, when incident light enters the cover plate 1000, the incident light first enters the light modulation layer 400, the incident light entering the light modulation layer 400 can enter the color conversion layer 300, the color conversion layer 300 has a plurality of quantum dots (not shown in the figure), the light absorbed and converted by the quantum dots can exit along any direction, part of the light can exit from the light-emitting surface 20 of the substrate 100, for example, can exit in each direction of the light-emitting surface 20, and wide-viewing-angle display can be achieved; after a portion of the light exits from the color conversion layer 300, the light can irradiate a surface of the light modulation layer 400 (refer to point a in fig. 1) on a side away from the color conversion layer 300, the light can be reflected by the light modulation layer 400, and then the light can be reflected back to the inside of the color conversion layer 300 again, and can pass through the color conversion layer 300 and the substrate 100, and exit from the light exit surface 20 of the substrate 100. Therefore, the light modulation layer 400 can adjust the light emitting direction of the incident light, and enable the incident light to be emitted from the light emitting surface 20, thereby increasing the proportion of the light emitted from the light emitting surface 20, increasing the light emitting efficiency of the organic light emitting display panel using the cover plate 1000, reducing the power consumption, and improving the display quality.
According to an embodiment of the present invention, the cover plate 1000 may have a plurality of light emitting units with different colors, for example, the light emitting units may include a red light emitting unit, a green light emitting unit, and a blue light emitting unit, and the color of the incident light entering the cover plate 1000 is not particularly limited, for example, the color of the incident light entering the cover plate 1000 may be blue, and the cover plate 1000 according to the embodiment of the present invention will be described in detail below with a case that the cover plate 1000 includes the red light emitting unit, the green light emitting unit, and the blue light emitting unit, and the incident light is blue light.
According to an embodiment of the present invention, referring to fig. 2, the light emitting unit 110 may include a red light emitting unit 110A, a green light emitting unit 110B, and a blue light emitting unit 110C, wherein colored conversion layers are disposed in the red light emitting unit 110A and the green light emitting unit 110B, for example, a red quantum dot color conversion layer 310 is disposed in the red light emitting unit 110A, and a green quantum dot color conversion layer 320 is disposed in the green light emitting unit 110B, and the red quantum dot color conversion layer 310 and the green quantum dot color conversion layer 320 may convert incident blue light into red light and green light, respectively. Specifically, a color conversion layer is not required to be disposed in the blue light emergent unit 110C, and the blue light can be directly emitted from the emergent surface 20 after being incident into the blue light emergent unit 110C. It should be noted that the direction of the blue incident light entering the blue light emitting unit 110C is concentrated, and when the direction and intensity of the emitted blue light are concentrated too much, the display viewing angle is narrow, which affects the display quality of the organic light emitting display panel. Therefore, in order to disperse the blue incident light entering the blue light emitting unit 110C, the blue light modulation layer 330 may be disposed in the blue light emitting unit 110C, and the blue light modulation layer 330 may adjust the blue light emitting direction in the blue light emitting unit 110C, that is, the blue light modulation layer 330 may scatter the incident blue light, so as to avoid the problem of narrow display viewing angle caused by too concentrated blue light emitting direction, and further improve the display quality. It should be noted that, the red light quantum dot color conversion layer 310 in the red light emitting unit 110A and the green light quantum dot color conversion layer 320 in the green light emitting unit 110B described above can not only convert blue light into red light or green light, but also change the direction of emergent light, so that the emergent light can be emitted along each direction of the light emitting surface 20, and further, the problems of narrow display viewing angle and the like caused by too concentrated light emitting directions of red light or green light can be avoided, and the display quality is further improved.
According to an embodiment of the present invention, the blue light modulation layer 330 may include one or more blue light modulation sub-layers (not shown), and the blue light modulation sub-layers may include a matrix and microparticles, wherein refractive indexes of the matrix and the microparticles are different, so that the blue light modulation sub-layer with the structure may better change a direction of the emitted blue light, and the blue light may be emitted along each direction of the light emitting surface 20, thereby further improving display quality. Specifically, the thickness of the blue light modulation sublayer may be 1 to 50 μm, for example, 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 40 μm, or the like; specifically, the microparticles may have an equivalent size of 0.025 to 5 μm, for example, 0.05 μm, 0.1 μm, 0.5 μm, 1 μm, 2 μm, 3 μm, or the like; specifically, in the blue light modulation sublayer, the volume ratio of the fine particles to the matrix may be 1: (1.25 to 20), for example, the ratio of 1: 3, can be 1: 5, can be 1: 10, can be 1: 15, etc. Therefore, the blue light modulation layer with the composition can well adjust the light emitting direction of the blue light which is incident into the blue light emitting unit, and the blue light can be emitted along each angle of the light emitting surface, so that the display performance and the display quality are further improved.
Specifically, in order to further improve the color purity of the light emitted from the light emitting units of different colors, a red light filter 510 may be further disposed in the red light emitting unit 110A, and the red light filter 510 is disposed between the light incident surface 10 of the substrate 100 and the red light quantum dot color conversion layer 310; a green filter 520 may be further disposed in the green light exiting unit 110B, and the green filter 520 is disposed between the light incident surface 10 of the substrate 100 and the green quantum dot color conversion layer 320. Specifically, in order to ensure the thickness uniformity of the entire cover plate 1000, a planarization layer 530 may be disposed in the blue light exiting unit 110C, and the planarization layer 530 is disposed between the substrate 100 and the blue light modulation layer 330.
Specifically, the light shielding structure 200 may include a black matrix, and the light modulation layer 400 may cover all surfaces of the red light quantum dot color conversion layer 310, the green light quantum dot color conversion layer 320, the blue light modulation layer 330, and the light shielding structure (black matrix) 200. Therefore, the light modulation layer 400 can adjust the light emitting direction of the incident light, and the incident light can be emitted from the light emitting surface, so that the light emitting efficiency of the organic light emitting display panel can be improved, the power consumption can be reduced, and the display quality can be improved; moreover, the light modulation layer 400 covers the surface of the blue light modulation layer 330, so that the light emitting direction of the blue light scattered by the blue light modulation layer 330 can be adjusted, the light emitted from the side wall of the blue light modulation layer 330 or along the direction opposite to the incident direction of the blue light can be reduced, the light emitting efficiency of the blue light can be improved, the light emitting efficiency of the organic light emitting display panel can be further improved, the power consumption can be reduced, and the display quality can be improved; moreover, the light modulation layer 400 is easy to prepare, for example, the light modulation layer 400 of the whole layer can be directly formed (for example, pasted) on all the surfaces of the red light quantum dot color conversion layer 310, the green light quantum dot color conversion layer 320, the blue light modulation layer 330 and the light shielding structure (black matrix) 200, and no other processing is needed, so that the operation is simple.
According to the embodiment of the invention, the shape of the light modulation layer 400 and the material forming the light modulation layer 400 are not particularly limited as long as the light modulation layer 400 can change the emitting direction of the light, so that the light passes through the color conversion layer 300 and the substrate 100 and is emitted from the light emitting surface 20 of the substrate 100.
Specifically, the material forming the light modulation layer 400 may include a photonic crystal. The Photonic crystal is an artificial periodic dielectric structure having Photonic Band-Gap (PBG) characteristics, or may be a periodic structure having an Electromagnetic Band-Gap (EBG), so that light can be transmitted or reflected at certain specific angles by using the PBG or the EBG. Therefore, when the light modulation layer 400 is formed by using the material, the transmittance or reflectance of light can be conveniently adjusted, the emitting direction of light can be conveniently adjusted, the light emitted in the direction opposite to the incident direction can be reduced, the proportion of light emitted from the light emitting surface can be further improved, and the light emitting efficiency of the organic light emitting display panel can be improved.
According to an embodiment of the present invention, referring to fig. 3, the light modulation layer 400 may include a first modulation sublayer 410 and a second modulation sublayer 420 which are stacked, the first modulation sublayer 410 being disposed apart from the color conversion layer 300The layer 410 has a continuously disposed first concave-convex structure, the cross-sectional shape of the convex portion of the first concave-convex structure may include at least one of a triangle, a hemisphere, and a quadrangular pyramid, and the height of the first modulation sublayer 410 may be 0.4 to 5 μm, for example, 1 μm, 1.5 μm, 2 μm, 3 μm, 4 μm, or the like; the second modulating sublayer 420 has a second relief structure complementary to the first modulating sublayer 410, wherein the refractive index n of the first modulating sublayer 410 1 Less than the refractive index n of the second modulating sublayer 420 2 . Thus, referring to the light propagation direction shown by the dotted line and the arrow in fig. 3, when light entering the inside of the cover plate 1000 is irradiated to the light modulation layer 400 and irradiated to the interface of the second modulation sublayer 420 and the first modulation sublayer 410, the refractive index n of the first modulation sublayer 410 is due to 1 Less than the refractive index n of the second modulating sublayer 420 2 In particular, the refractive index n of the first modulating sublayer 410 1 May be 1.4 to 1.7, for example, may be 1.6, and the refractive index n of the second modulation sublayer 420 2 The light emitting efficiency of the organic light emitting display panel can be 1.7 to 1.9, for example, 1.8, so that the light can be totally reflected at the interface and can be reflected back to the inside of the optical modulation layer 400, thereby reducing the light emitted in the direction opposite to the incident light direction, and the light can pass through the color conversion layer 300 and the substrate 100 and be emitted from the light emitting surface of the substrate 100, thereby further increasing the proportion of the light emitted from the light emitting surface and increasing the light emitting efficiency of the organic light emitting display panel.
In particular, referring to fig. 4, the light modulation layer 400 may further include a plurality of medium sub-layers, such as the first medium sub-layer 430, the second medium sub-layer 440, and the third medium sub-layer 450 illustrated in fig. 4, wherein the refractive indices of the adjacent two medium sub-layers are different. Therefore, through the plurality of medium sub-layers with different refractive indexes, the emergent direction of the light entering the cover plate 1000 can be simply adjusted, the light emergent in the direction opposite to the incident direction can be reduced, the proportion of the light emergent from the emergent surface is further improved, and the light emergent efficiency of the organic light-emitting display panel is improved. Specifically, the total number of the medium sub-layers may be 3 to 10, for example, 5, 6, 7, 9, or the like; specifically, the thickness of the light modulation layer 400 may be 0.5 to 10 μm, for example, 1 μm, 3 μm, 5 μm, 7 μm, 9 μm, or the like. Therefore, the light modulation layer 400 with the above characteristics can better adjust the light emitting direction of the light, reduce the light emitted in the direction opposite to the incident light direction, further increase the proportion of the light emitted from the light emitting surface, and improve the light emitting efficiency of the organic light emitting display panel.
According to an embodiment of the present invention, the method for preparing the light modulation layer 400 is not particularly limited, and referring to fig. 2, for example, the light modulation layer 400 may be prepared in advance, and then the light modulation layer 400 is completely applied on the surfaces of the red light quantum dot color conversion layer 310, the green light quantum dot color conversion layer 320, the blue light modulation layer 330 and the light shielding structure (black matrix) 200 by an attaching process. Thereby, the cover plate 1000 having the light modulation layer 400 may be simply prepared. Specifically, the light modulation layer 400 may also be directly prepared on the side of the color conversion layer 300 away from the substrate 100 by deposition or etching.
Specifically, referring to fig. 5, the cover plate 1000 may further include a color conversion layer package structure 600, where the color conversion layer package structure 600 is disposed on a side of the light modulation layer 400 away from the color conversion layer 300 and forms a sealed structure. Specifically, the color conversion layer package structure 600 may be a thin film structure, and the color conversion layer package structure 600 may include a plurality of stacked inorganic/organic film layers, so that the color conversion layer 300 may be better protected by the color conversion layer package structure 600, the purpose of blocking water and oxygen is achieved, and the use performance of the cover plate 1000 is further improved.
As can be seen from the above, according to the cover plate 1000 for the organic light emitting display device of the embodiment of the invention, by providing the light modulation layer 400, the light modulation layer 400 can adjust the light emitting direction of the incident light, so that the incident light can be emitted from the light emitting surface 20, the light emitting efficiency of the organic light emitting display panel using the cover plate 1000 can be improved, the power consumption can be reduced, and the display quality can be improved.
In another aspect of the present invention, an organic light emitting display panel is provided. According to an embodiment of the present invention, referring to fig. 6, the organic light emitting display panel 1200 includes: the organic light emitting display cover plate 1000 and the organic light emitting display back plate 1100 are oppositely disposed, the organic light emitting display cover plate 1000 may be the cover plate 1000 for the organic light emitting display device described above, and the light modulation layer 400 of the organic light emitting display cover plate 1000 is disposed toward the organic light emitting display back plate 1100. The organic light emitting display backplane 1100 includes: the organic light emitting display comprises a substrate 700, wherein a plurality of light emitting units 710 defined by a pixel definition layer 800 are arranged on the substrate 700, a first electrode layer 910, a light emitting layer 920 and a second electrode layer 930 are sequentially stacked in the light emitting units 710, and the light emitting units 710 and light emitting units 110 in an organic light emitting display cover plate 1000 are arranged in a one-to-one correspondence manner. Accordingly, the organic light emitting display panel 1200 has all the features and advantages of the cover plate 1000 for organic light emitting display device described above, and thus, the description thereof is omitted. In general, the organic light emitting display panel 1200 has high light emitting efficiency, low power consumption, and good display performance. According to an embodiment of the present invention, the material forming the light emitting layer 920 includes a blue light emitting material. Thereby, the use performance of the organic light emitting display panel 1200 is further improved.
In yet another aspect of the present invention, a display device is provided. According to an embodiment of the present invention, a display device includes the organic light emitting display panel described above. Therefore, the display device has all the features and advantages of the organic light emitting display panel, which are not described herein again. In general, the display device has low power consumption and good display performance.
The invention will now be illustrated by means of specific examples, which are intended to illustrate the invention and should not be construed as limiting the scope thereof. The examples, where specific techniques or conditions are not indicated, are to be construed according to the techniques or conditions described in the literature in the art or according to the product specifications.
Example 1 preparation of organic light emitting display Panel A
(1) Providing an organic light-emitting display back plate, wherein light-emitting layers of the organic light-emitting display back plate are all formed by blue light-emitting materials;
(2) referring to fig. 2, a substrate 100 has a plurality of light emitting units 110 thereon, and each light emitting unit 110 includes a red light emitting unit 110A, a green light emitting unit 110B, and a blue light emitting unit 110C:
a red light quantum dot color conversion layer 310 is arranged in the red light emitting unit 110A, a green light quantum dot color conversion layer 320 is arranged in the green light emitting unit 110B, and a blue light modulation layer 330 is arranged in the blue light emitting unit 110C;
a red light filter 510 is arranged between the light incident surface 10 of the substrate 100 and the red light quantum dot color conversion layer 310, a green light filter 520 is arranged between the light incident surface 10 of the substrate 100 and the green light quantum dot color conversion layer 320, and a planarization layer 530 is arranged between the flat substrate 100 and the blue light modulation layer 330;
the light modulation layer 400 covers all surfaces of the red light quantum dot color conversion layer 310, the green light quantum dot color conversion layer 320, the blue light modulation layer 330 and the light shielding structure 200;
also, with reference to the structure of the light modulation layer 400 illustrated in fig. 3, the light modulation layer 400 includes a first modulation sublayer 410 and a second modulation sublayer 420 which are stacked, the first modulation sublayer 410 is disposed away from the color conversion layer 300, the first modulation sublayer 410 has a first concave-convex structure continuously disposed, a cross-sectional shape of a convex portion of the first concave-convex structure is triangular, the second modulation sublayer 420 has a second concave-convex structure complementary to the first concave-convex structure of the first modulation sublayer 410, and a refractive index n of the first modulation sublayer 410 1 Is 1.6, the refractive index n of the second modulating sublayer 420 2 Is 1.8.
(3) And oppositely arranging the organic light-emitting display back plate and the organic light-emitting display cover plate formed in the previous step, wherein the light-emitting units in the organic light-emitting display back plate and the light-emitting units in the organic light-emitting display cover plate are arranged in a one-to-one correspondence manner.
Comparative example 1 preparation of organic light emitting display Panel B
The other structure of the organic light emitting display panel B is the same as that of embodiment 1, except that no light modulation layer is disposed in the organic light emitting display cover of the organic light emitting display panel B (refer to fig. 7 for specific structure).
Performance testing
The organic light emitting display panels a and B of example 1 and comparative example 1 were tested for light extraction efficiency, and the test results are shown in table 1:
table 1: power consumption test meter for organic light emitting display panel A and organic light emitting display panel B
In the above test, the power consumption of the organic light emitting display panel B in comparative example 1 was set at fixed color gamut coordinates (CIEx and CIEy, i.e., color gamut coordinates, in which red light R, green light G, blue light B, and white light W are listed in the table) and the power consumption of the organic light emitting display panel a in example 1 at the same color gamut coordinates was measured.
The test result shows that, in the organic light-emitting display panel a in embodiment 1, because the light modulation layer is disposed, the light modulation layer can adjust the light-emitting direction of the incident light, so that the incident light can be emitted from the light-emitting surface, and the light-emitting efficiency of the organic light-emitting display panel using the cover plate can be improved, thereby reducing power consumption and improving display quality.
In the description of the present invention, the directions or positional relationships indicated are based on those shown in the drawings, and are only for convenience of describing the present invention but do not require the present invention to be necessarily constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention.
In the description herein, references to the description of "one embodiment," "another embodiment," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (7)
1. A cover plate for an organic light emitting display device, comprising:
the light source comprises a substrate, a light source and a light source, wherein the substrate is provided with a plurality of light emitting units limited by a light shielding structure and is provided with a light incident surface and a light emitting surface;
at least part of the light emitting units are provided with colored conversion layers, and the colored conversion layers are arranged on the light incident surface of the substrate;
the light modulation layer is arranged on one side, far away from the substrate, of the color conversion layer and is configured to enable incident light to pass through the color conversion layer and the substrate and to be emitted from the light emitting surface of the substrate;
the light emitting unit comprises a red light emitting unit, a green light emitting unit and a blue light emitting unit, the color conversion layers are arranged in the red light emitting unit and the green light emitting unit,
a red light quantum dot color conversion layer is arranged in the red light emergent unit, and a red light filter is arranged between the red light quantum dot color conversion layer and the substrate;
a green light quantum dot color conversion layer is arranged in the green light emitting unit, and a green light filter is arranged between the green light quantum dot color conversion layer and the substrate;
a blue light modulation layer is arranged in the blue light emergent unit, a planarization layer is arranged between the blue light modulation layer and the substrate,
the shading structure comprises a black matrix, and the light modulation layer covers all surfaces of the red light quantum dot color conversion layer, the green light quantum dot color conversion layer, the blue light modulation layer and the black matrix;
the light modulation layer comprises a first modulation sub-layer and a second modulation sub-layer which are arranged in a laminated mode, the first modulation sub-layer is arranged far away from the color conversion layer and has a first concave-convex structure which is continuously arranged, the second modulation sub-layer has a second concave-convex structure which is complementary to the first modulation sub-layer, and the refractive index of the first modulation sub-layer is smaller than that of the second modulation sub-layer;
the blue light modulation layer comprises one or more blue light modulation sub-layers comprising a matrix and micro-particles, the refractive indices of the matrix and the micro-particles being different,
the thickness of the blue light modulation sub-layer is 1-50 μm, the equivalent size of the micro-particles is 0.025-5 μm, and the volume ratio of the micro-particles to the substrate in the blue light modulation sub-layer is 1: (1.25-20).
2. The cover sheet of claim 1 wherein the material forming the light modulation layer comprises a photonic crystal.
3. The cover sheet of claim 1, wherein the light modulation layer comprises a plurality of laminated dielectric sub-layers, and the refractive index of two adjacent dielectric sub-layers is different.
4. The cover sheet according to claim 3, wherein the medium sub-layer has a total number of layers of 3 to 10 and the light modulation layer has a thickness of 0.5 to 10 μm.
5. An organic light emitting display panel, comprising:
an organic light emitting display cover plate and an organic light emitting display back plate which are oppositely arranged, wherein the organic light emitting display cover plate is the cover plate for the organic light emitting display device as claimed in any one of claims 1 to 4, the light modulation layer of the organic light emitting display cover plate is arranged towards the organic light emitting display back plate,
the organic light emitting display back panel includes: the substrate, have a plurality of luminescence units that pixel definition layer injectd on the substrate, the inside of luminescence unit has first electrode layer, luminescent layer and the second electrode layer that stacks gradually the setting, luminescence unit with in the organic light emitting display apron the luminescence unit one-to-one sets up.
6. The organic light-emitting display panel according to claim 5, wherein a material forming the light-emitting layer includes a blue light-emitting material.
7. A display device characterized by comprising the organic light-emitting display panel according to claim 5 or 6.
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| KR20210129786A (en) | 2020-04-20 | 2021-10-29 | 삼성디스플레이 주식회사 | Color conversion panel and display device including the same, and manufacturing method thereof |
| GB2609579A (en) * | 2021-03-22 | 2023-02-08 | Boe Technology Group Co Ltd | Display substrate and preparation method therefor, display device, and color filter substrate |
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