CN110265463B - Display panel and display device - Google Patents
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- CN110265463B CN110265463B CN201910570610.8A CN201910570610A CN110265463B CN 110265463 B CN110265463 B CN 110265463B CN 201910570610 A CN201910570610 A CN 201910570610A CN 110265463 B CN110265463 B CN 110265463B
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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
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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
- H10K50/86—Arrangements for improving contrast, e.g. preventing reflection of ambient light
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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
- H10K59/121—Active-matrix OLED [AMOLED] displays characterised by the geometry or disposition of pixel elements
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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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- 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
- H10K59/353—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels characterised by the geometrical arrangement of the RGB subpixels
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Abstract
The invention discloses a display panel and a display device. The display panel comprises a plurality of pixel units, wherein each pixel unit comprises a first red sub-pixel, a second red sub-pixel, a green sub-pixel and a blue sub-pixel; under a specific visual angle, the color cast corresponding to the emergent light of the first red sub-pixel is equal to the color cast corresponding to the emergent light of the second red sub-pixel, under the same visual angle smaller than the specific visual angle, the color cast corresponding to the emergent light of the first red sub-pixel is larger than the color cast corresponding to the emergent light of the second red sub-pixel, and under the same visual angle larger than the specific visual angle, the color cast corresponding to the emergent light of the first red sub-pixel is smaller than the color cast corresponding to the emergent light of the second red sub-pixel. Therefore, under the same viewing angle which is not equal to the specific viewing angle, the smaller color shift can compensate the larger color shift, thereby reducing the color shift of emergent light of the pixel unit under the non-normal viewing angle and improving the display effect of the display panel.
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
The refractive indices of different colors of light are different for the same material, and thus the direction of deflection is different for each light at the same angle of incidence. The larger the wavelength of light, the more severe the deflection direction and the greater the degree of brightness attenuation.
In the display panel, as the viewing angle of a user increases, the brightness attenuation degree of red light is greater than that of blue light, so that the white light is blue at a large viewing angle.
Disclosure of Invention
The invention provides a display panel and a display device, which are used for reducing the color cast phenomenon of the display panel under a large viewing angle.
In a first aspect, an embodiment of the present invention provides a display panel, including a plurality of light emitting units;
the light-emitting unit at least comprises a first red sub-pixel, a second red sub-pixel, a green sub-pixel and a blue sub-pixel; under a specific visual angle, the color cast corresponding to the emergent light of the first red sub-pixel is equal to the color cast corresponding to the emergent light of the second red sub-pixel, and under the same visual angle smaller than the specific visual angle, the color cast corresponding to the emergent light of the first red sub-pixel is larger than the color cast corresponding to the emergent light of the second red sub-pixel, and under the same visual angle larger than the specific visual angle, the color cast corresponding to the emergent light of the first red sub-pixel is smaller than the color cast corresponding to the emergent light of the second red sub-pixel.
Optionally, the specific viewing angle ranges from 40 ° to 60 ° with respect to a positive viewing angle, where the positive viewing angle is a viewing angle perpendicular to the light emitting surface of the display panel, and the positive viewing angle is 0 °.
Optionally, in the specific viewing angle, a color shift corresponding to the emergent light of the first red sub-pixel or a color shift corresponding to the emergent light of the second red sub-pixel is smaller than 4.5 JNCD.
Optionally, a first wavelength corresponding to the emergent light of the first red sub-pixel is different from a second wavelength corresponding to the emergent light of the second red sub-pixel; preferably, the difference between the first wavelength and the second wavelength is greater than or equal to 10 nm.
Optionally, the light emitting unit includes an anode, a cathode, and a light emitting layer between the anode and the cathode, the first red sub-pixel includes a first red light emitting layer, the second red sub-pixel includes a second red light emitting layer, and the light emitting wavelengths of the first red light emitting layer and the second red light emitting layer are different.
Alternatively, the material of the first red light-emitting layer includes bis (2- (3, 5-dimethylphenyl) quinoline C2, N') (acetylacetone) iridium (III), and the material of the second red light-emitting layer includes tris (1-phenylisoquinoline) iridium (III).
Optionally, the sum of the opening area of the first red sub-pixel and the opening area of the second red sub-pixel is smaller than or equal to the opening area of the blue sub-pixel; preferably, the opening area of the first red sub-pixel and the opening area of the second red sub-pixel are equal.
Optionally, a distance between the first red subpixel and the second red subpixel is greater than or equal to 24 μm.
Optionally, the light emitting wavelength of the first red sub-pixel is longer than the light emitting wavelength of the second red sub-pixel, and the display panel further includes a light extraction layer located on the light emitting side of the light emitting unit;
the refractive index of the light extraction layer corresponding to the first red sub-pixel is smaller than the refractive index of the light extraction layer corresponding to the second red sub-pixel; and/or the thickness of the light extraction layer corresponding to the first red sub-pixel is greater than the thickness of the light extraction layer corresponding to the second red sub-pixel.
In a second aspect, an embodiment of the present invention further provides a display device, including the display panel provided in any embodiment of the present invention.
In the technical solution of the embodiment of the present invention, the light emitting unit in the display panel includes a first red sub-pixel and a second red sub-pixel, a color shift corresponding to the emergent light of the first red sub-pixel is equal to a color shift corresponding to the emergent light of the second red sub-pixel at a specific viewing angle, and the color shift corresponding to the emergent light of the first red sub-pixel is greater than the color shift corresponding to the emergent light of the second red sub-pixel at a same viewing angle smaller than the specific viewing angle, and the color shift corresponding to the emergent light of the first red sub-pixel is smaller than the color shift corresponding to the emergent light of the second red sub-pixel at a same viewing angle larger than the specific viewing angle. Therefore, under the same viewing angle which is not equal to the specific viewing angle, the smaller color shift can compensate the larger color shift, that is, under different viewing angles, the color shift corresponding to the emergent light of the first red sub-pixel and the color shift corresponding to the emergent light of the second red sub-pixel can compensate each other, so that the color shift of the emergent light of the light-emitting unit under the non-normal viewing angle can be reduced, and the display effect of the display panel can be 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 diagram illustrating a relationship between color shift and viewing angle according to an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view taken along section AA' of FIG. 1;
fig. 4 is a schematic structural diagram of a light emitting unit according to an embodiment of the present invention;
fig. 5 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 of the structures related to the present invention are shown in the drawings, not all of the structures.
In the prior art, an Organic Light-Emitting Diode (OLED) generally includes an anode, an Organic Light-Emitting layer and a cathode, which are stacked. In the light emitting process of the OLED, when a driving current is supplied to the OLED, electrons are injected from the cathode into the organic light emitting layer, holes are injected from the anode into the organic light emitting layer, the electrons and the holes are combined in the organic light emitting layer to form excitons in an excited state, the excitons in the excited state are attenuated, and energy is released in the form of light, that is, the organic light emitting layer emits light. When the OLED display panel is a top-emitting device, and the anode, the organic light-emitting layer and the cathode of the organic light-emitting diode form a microcavity structure, light can generate a microcavity effect in the microcavity, so that light with a specific wavelength is enhanced in a direction perpendicular to the display panel, and the luminous intensity of the OLED in the display panel is enhanced. The refractive indexes of the light with different wavelengths under the same material are different, so that the deflection directions of the light with different wavelengths under the same visual angle are different on the light-emitting surface of the OLED display panel, and the attenuation degrees of the light with different wavelengths are different under the action of the microcavity. When the OLED display panel emits mixed color light, the deflection directions of various monochromatic light forming the mixed color light at the same visual angle are different, and the attenuation degrees are also different, so that the mixed color light can generate color cast. For example, white light displayed at a positive viewing angle (viewing angle perpendicular to the light-emitting surface of the OLED display panel) may exhibit color shifts of different degrees under a non-positive viewing angle (viewing angle not perpendicular to the light-emitting surface of the OLED display panel), and at the non-positive viewing angle, a deflection direction of red light is different from a deflection direction of blue light, and an attenuation degree of red light is greater than an attenuation degree of blue light, so that the white light emitted by the OLED display panel may exhibit a bluish phenomenon.
In view of the above problems, embodiments of the present invention provide a display panel. Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention. As shown in fig. 1, the display panel includes a plurality of light emitting cells 10.
The light emitting unit 10 includes at least a first red subpixel 101, a second red subpixel 102, a green subpixel 103, and a blue subpixel 104. Under a specific viewing angle, the color shift corresponding to the emergent light of the first red sub-pixel 101 is equal to the color shift corresponding to the emergent light of the second red sub-pixel 102, and under the same viewing angle smaller than the specific viewing angle, the color shift corresponding to the emergent light of the first red sub-pixel 101 is larger than the color shift corresponding to the emergent light of the second red sub-pixel 102, and under the same viewing angle larger than the specific viewing angle, the color shift corresponding to the emergent light of the first red sub-pixel 101 is smaller than the color shift corresponding to the emergent light of the second red sub-pixel 102.
Specifically, fig. 2 is a diagram of a relationship between color shift and viewing angle, which illustrates an effect of red lights with different wavelengths on color shift under a non-normal viewing angle according to an embodiment of the present invention. As shown in fig. 2, the abscissa is the viewing angle and the ordinate is the color shift. Curve 1 is the relationship between the color shift and the viewing angle for red light of one wavelength, and curve 2 is the relationship between the color shift and the viewing angle for red light of another wavelength. The wavelength of red light corresponding to the curve 1 is longer than the wavelength of red light corresponding to the curve 2. As can be seen from the curves 1 and 2, the color shift corresponding to the red light shown in the curve 1 is equal to the color shift corresponding to the red light shown in the curve 2 at the viewing angle a. When the viewing angle is smaller than the viewing angle a, the color shift corresponding to the red light shown by the curve 1 is larger than the color shift corresponding to the red light shown by the curve 2, and when the viewing angle is larger than the viewing angle a, the color shift corresponding to the red light shown by the curve 1 is smaller than the color shift corresponding to the red light shown by the curve 2. Based on this, two red sub-pixels can be disposed in one pixel, including a first red sub-pixel and a second red sub-pixel, where the first red sub-pixel can emit red light corresponding to the curve 1, and the second red sub-pixel can emit red light corresponding to the curve 2. Therefore, under the same visual angle smaller than the A visual angle, the smaller color shift corresponding to the emergent light of the second red sub-pixel can compensate the larger color shift corresponding to the emergent light of the first red sub-pixel so as to reduce the color shift corresponding to the emergent light of the first red sub-pixel; and under the same visual angle larger than the visual angle A, the smaller color shift corresponding to the emergent light of the first red sub-pixel can compensate the larger color shift corresponding to the emergent light of the second red sub-pixel so as to reduce the color shift corresponding to the emergent light of the second red sub-pixel. Therefore, compared with the case that only one red sub-pixel is arranged, the first red sub-pixel and the second red sub-pixel are arranged, and the color shifts corresponding to the emergent light of the first red sub-pixel and the second red sub-pixel are mutually compensated, so that the influence of the red light on the color shift under the non-normal viewing angle can be integrally reduced, the problem that the red light is emitted only by one red sub-pixel to cause obvious or large color shift under the non-normal viewing angle is avoided, and the problem of the color shift under the non-normal viewing angle is improved.
In this embodiment, the specific viewing angle ranges from 40 ° to 60 ° with respect to the front viewing angle, where the front viewing angle is a viewing angle perpendicular to the light emitting surface of the display panel, and the front viewing angle is 0 °. The emergent light of the first red sub-pixel 101 is red light with a first wavelength, the emergent light of the second red sub-pixel 102 is red light with a second wavelength, the emergent light of the green sub-pixel 103 is green light, the emergent light of the blue sub-pixel 104 is blue light, and as can be seen from fig. 2, the first wavelength is different from the second wavelength.
It should be noted that fig. 1 only schematically illustrates one possible pixel arrangement, and does not limit the pixel structure of the present invention, as long as the light emitting unit of the present invention at least includes a first red sub-pixel 101, a second red sub-pixel 102, a green sub-pixel 103, and a blue sub-pixel 104.
In the technical solution of this embodiment, a light emitting unit in a display panel includes a first red sub-pixel and a second red sub-pixel, where a color shift corresponding to emergent light of the first red sub-pixel is equal to a color shift corresponding to emergent light of the second red sub-pixel at a specific viewing angle, and the color shift corresponding to emergent light of the first red sub-pixel is greater than the color shift corresponding to emergent light of the second red sub-pixel at a same viewing angle smaller than the specific viewing angle, and the color shift corresponding to emergent light of the first red sub-pixel is smaller than the color shift corresponding to emergent light of the second red sub-pixel at a same viewing angle larger than the specific viewing angle. Therefore, under the same viewing angle which is not equal to the specific viewing angle, the smaller color shift can compensate the larger color shift, that is, under different viewing angles, the color shift corresponding to the emergent light of the first red sub-pixel and the color shift corresponding to the emergent light of the second red sub-pixel can compensate each other, so that the color shift of the emergent light of the light-emitting unit under the non-normal viewing angle can be reduced, and the display effect of the display panel can be improved.
Based on the above embodiment, it is preferable that the color shift corresponding to the outgoing light of the second red sub-pixel at any viewing angle smaller than the specific viewing angle is smaller than the color shift corresponding to the outgoing light of the second red sub-pixel at the specific viewing angle; the color shift corresponding to the emergent light of the first red sub-pixel at any visual angle larger than the specific visual angle is smaller than the color shift corresponding to the emergent light of the first red sub-pixel at the specific visual angle. Therefore, the color shift corresponding to the emergent light of the first red sub-pixel under the same visual angle and the color shift corresponding to the emergent light of the second red sub-pixel under the specific visual angle can be compensated more, so that the color shift problem under the non-normal visual angle caused by the influence of red light can be further reduced.
Further, under a specific viewing angle, a color shift corresponding to the emergent light of the first red sub-pixel or a color shift corresponding to the emergent light of the second red sub-pixel is smaller than 4.5 JNCD.
Specifically, in general, when the color shift is greater than or equal to 4.5JNCD (standard color shift), a noticeable color shift phenomenon may be perceived by the human eye. Therefore, under a specific visual angle, by setting the color cast corresponding to the emergent light of the first red sub-pixel or the color cast corresponding to the emergent light of the second red sub-pixel to be less than 4.5JNC, the color cast after the color cast corresponding to the emergent light of the first red sub-pixel and the color cast corresponding to the emergent light of the second red sub-pixel are mutually compensated can be less than 4.5JNC, so that the color cast under a non-normal visual angle can not be identified by human eyes, and the display effect of the display panel is improved.
In addition to the above-described embodiments, the first wavelength corresponding to the light emitted from the first red subpixel is different from the second wavelength corresponding to the light emitted from the second red subpixel.
Specifically, the outgoing light of different sub-pixels in the light emitting unit has different wavelengths. In the case of a front view angle of the display panel, different wavelengths correspond to different coordinate values of CIE xyz chromaticity coordinates. The coordinate values of the CIE xyz chromaticity coordinates are different, and the attenuation degree of the corresponding wavelength along with the change of the viewing angle is also different. After the coordinate value of the CIE xyz chromaticity coordinate is determined, the attenuation degree of the emergent light of the sub-pixel under different viewing angles can be calculated according to the coordinate value of the CIE xyz chromaticity coordinate. Generally, the attenuation of the emitted light from a sub-pixel is measured by the percentage of the emitted light from the sub-pixel at a positive viewing angle. The smaller the percentage of the sub-pixel's outgoing light relative to the sub-pixel's outgoing light at a viewing angle, the greater the attenuation of the sub-pixel's outgoing light at that viewing angle.
When the first wavelength corresponding to the emergent light of the first red sub-pixel is different from the second wavelength corresponding to the emergent light of the second red sub-pixel, the coordinate value of the emergent light of the first red sub-pixel on the CIE xyz chromaticity coordinate value is different from the coordinate value of the emergent light of the second red sub-pixel on the CIE xyz chromaticity coordinate value, so that the attenuation degree of the emergent light of the first red sub-pixel is different from that of the emergent light of the second red sub-pixel under the same viewing angle, and the influence of the emergent light of the first red sub-pixel and the emergent light of the second red sub-pixel on the color shift under the same viewing angle is different, namely the color shift corresponding to the emergent light of the first red sub-pixel is different from that corresponding to the emergent light of the second red sub-pixel. Therefore, by setting the first wavelength corresponding to the emergent light of the first red sub-pixel to be different from the second wavelength corresponding to the emergent light of the second red sub-pixel, the color shift corresponding to the emergent light of the first red sub-pixel and the color shift corresponding to the emergent light of the second red sub-pixel can be mutually compensated under a non-front viewing angle, the color shift under the non-front viewing angle is reduced, and the display effect of the display panel is improved.
In addition, with reference to fig. 1, the first red subpixel 101 and the second red subpixel 102 are two independent subpixels, and when the first wavelength of the emergent light of the first red subpixel 101 is different from the second wavelength of the emergent light of the second red subpixel 102, the emission spectrum of the emergent light with a shorter wavelength in the two red subpixels may be at least partially overlapped with the absorption spectrum of the emergent light with a longer wavelength, so that the energy of the emergent light with a shorter wavelength is transferred into the emergent light with a longer wavelength, which causes the red subpixel corresponding to the emergent light with a longer wavelength to emit light, thereby ensuring that the color shifts corresponding to the emergent light of the first red subpixel 101 and the emergent light of the second red subpixel 102 compensate each other, reducing the color shift degree of the light-emitting unit 10 at different viewing angles, and improving the display effect of the display panel.
Preferably, the difference between the first wavelength and the second wavelength is greater than or equal to 10 nm.
Specifically, when the difference between the first wavelength of the emergent light of the first red sub-pixel and the second wavelength of the emergent light of the second red sub-pixel is greater than or equal to 10nm, it can be ensured that the variation trend of the color shift corresponding to the red light with the first wavelength and the variation trend of the color shift corresponding to the red light with the second wavelength satisfy the variation trends of the color shifts corresponding to the red lights with two different wavelengths shown in fig. 2, and further it can be ensured that the color shift corresponding to the emergent light of the first red sub-pixel and the color shift corresponding to the emergent light of the second red sub-pixel can compensate each other under a non-normal viewing angle, thereby reducing the color shift under the non-normal viewing angle and improving the display effect of the display panel. For example, the first wavelength of the emergent light of the first red sub-pixel may be 625nm, the second wavelength of the emergent light of the second red sub-pixel may be 615nm, and the difference between the first wavelength and the second wavelength is equal to 10nm, at this time, the variation trend of the color shift corresponding to the emergent light of the first red sub-pixel along with the change of the viewing angle is just opposite to the variation trend of the color shift corresponding to the emergent light of the second red sub-pixel along with the change of the viewing angle, so that the two color shifts under the non-normal viewing angle can be compensated with each other, thereby the color shift of the emergent light of the light emitting unit under the non-normal viewing angle can be reduced, and the display effect of the display panel can be improved.
In addition, the display panel comprises a plurality of light-emitting units, each light-emitting unit comprises a first red sub-pixel and a second red sub-pixel, and the first red sub-pixel and the second red sub-pixel are used for improving the color cast phenomenon generated when emergent light of the light-emitting units is mixed with light, and simultaneously the color cast phenomenon of the display panel is integrally improved. When the display panel is manufactured, due to the limitation of the manufacturing process, the first wavelength of emergent light of the first red sub-pixel in the light-emitting unit fluctuates within a certain range, and the second wavelength of emergent light of the second red sub-pixel also fluctuates within a certain range. By setting the difference between the first wavelength and the second wavelength to be greater than or equal to 10nm, it can be ensured that the variation trend of the color shift corresponding to the emergent light of the first red sub-pixel and the variation trend of the color shift corresponding to the emergent light of the second red sub-pixel satisfy the variation trends of the color shifts corresponding to the two red lights with different wavelengths shown in fig. 2. Illustratively, when the first wavelength of the emergent light of the first red sub-pixel needs to be set to be 625nm, the first wavelength of the emergent light of the first red sub-pixel in the plurality of light emitting units of the display panel is 622nm-628nm due to the limitation of the manufacturing process. When the second wavelength of the emergent light of the second red sub-pixel needs to be set to be 615nm, due to the limitation of the manufacturing process, the range of the first wavelength of the emergent light of the first red sub-pixel in the plurality of light-emitting units of the display panel is 612nm to 618nm, and at this time, the variation trend of the color shift corresponding to the emergent light of the first red sub-pixel and the variation trend of the color shift corresponding to the emergent light of the second red sub-pixel of 95% of the light-emitting units in the display panel can be ensured to meet the variation trend of the color shift corresponding to the red light with two different wavelengths shown in fig. 2.
It should be noted that, here, the first wavelength of the emergent light of the first red sub-pixel and the second wavelength of the emergent light of the second red sub-pixel are only an example, and are not limited. In other embodiments, the first wavelength and the second wavelength may be adjusted according to the material and film thickness of the sub-pixels in the light emitting unit.
Based on the above technical solutions, in an embodiment of the present invention, fig. 3 is a schematic cross-sectional structure view taken along the AA' section of fig. 1. As shown in fig. 3, the light emitting unit includes an anode 110, a cathode 120, and a light emitting layer 130 between the anode 110 and the cathode 120, the first red sub-pixel includes a first red light emitting layer 131, the second red sub-pixel includes a second red light emitting layer 132, and the first red light emitting layer 131 and the second red light emitting layer 132 have different light emitting wavelengths.
Specifically, the light emitting wavelengths of the first red light emitting layer 131 and the second red light emitting layer 132 are different, so that the wavelength of the light emitted from the first red sub-pixel is different from the wavelength of the light emitted from the second red sub-pixel, and therefore, by setting the light emitting wavelengths of the first red light emitting layer 131 and the second red light emitting layer 132 to be different, the color shift corresponding to the light emitted from the first red sub-pixel and the color shift corresponding to the light emitted from the second red sub-pixel can be compensated with each other, thereby reducing the maximum color shift under the non-normal viewing angle, and improving the color shift problem.
Illustratively, the material of the first red light-emitting layer 131 includes bis (2- (3, 5-dimethylphenyl) quinoline C2, N') (acetylacetonato) iridium (III), corresponding to an emission wavelength of 615 nm. The material of the second red light emitting layer 132 includes tris (1-phenylisoquinoline) iridium (III), which corresponds to an emission wavelength of 625 nm. When a driving current is formed between the anode 110 and the cathode 120, the light emitting wavelength of the material of the first red light emitting layer 131 is smaller than that of the material of the second red light emitting layer 132, thereby realizing that the light emitting wavelengths of the first red light emitting layer 131 and the second red light emitting layer 132 are different.
Fig. 3 also includes a green sub-pixel and a blue sub-pixel, where the green sub-pixel includes a green light-emitting layer 133, and the blue sub-pixel includes a blue light-emitting layer 134. The wavelength of light emitted from the blue light-emitting layer 134 is the smallest, and the wavelength of light emitted from the green light-emitting layer 133 is smaller than the wavelength of light emitted from the first red sub-pixel and the wavelength of light emitted from the second red sub-pixel.
On the basis of the above technical solutions, fig. 4 is a schematic structural diagram of a light emitting unit according to an embodiment of the present invention. As shown in fig. 4, the light emitting wavelength of the first red sub-pixel is greater than the light emitting wavelength of the second red sub-pixel, and the display panel further includes a light extraction layer on the light emitting side of the light emitting unit.
The refractive index of the light extraction layer corresponding to the first red sub-pixel is smaller than the refractive index of the light extraction layer corresponding to the second red sub-pixel, and/or the thickness of the light extraction layer corresponding to the first red sub-pixel is larger than the thickness of the light extraction layer corresponding to the second red sub-pixel.
Optionally, the refractive index of the light extraction layer corresponding to the first red sub-pixel and the refractive index of the light extraction layer corresponding to the second red sub-pixel range from 1.855 to 1.865; the thickness of the light extraction layer corresponding to the first red sub-pixel and the thickness of the light extraction layer corresponding to the second red sub-pixel are in a range of 64nm to 66 nm. Therefore, under the condition that the light-emitting wavelength of the first red sub-pixel is larger than that of the second red sub-pixel and the wavelength difference (less than or equal to 10nm) is satisfied, the light extraction layer corresponding to the first red sub-pixel and the light extraction layer corresponding to the second red sub-pixel are selectively arranged in the refractive index range and the thickness range, so that the light extraction rate of the light emitted by the first red sub-pixel and the second red sub-pixel can be improved, and the color shift of the display panel can be improved under the condition that the light color purity is ensured.
Specifically, as shown in fig. 4, the anode 110, the cathode 120, and the light emitting layer 130 positioned between the anode 110 and the cathode 120 of the light emitting unit form a microcavity structure. When the cavity length of the microcavity and the wavelength of the light satisfy a certain relationship, the light emitted by the light-emitting layer 130 forms a microcavity effect in the microcavity, that is, the light emitted by the light-emitting layer 130 is emitted from the cathode under the actions of anode reflection, cathode reflection, refraction and the like, so that the optical intensity emitted vertically by the display panel can be increased, and the light-emitting brightness of the display panel is further increased.
As the cavity length of the microcavity increases, a blue shift phenomenon occurs in the display effect, and by providing a light extraction layer on the light exit side of the light emitting unit (fig. 4 exemplarily shows that the light emitting unit is a top emission device, and the light exit side of the light emitting unit is a cathode), the color shift amount at the positive viewing angle and the oblique viewing angle can be reduced, so that the shift amount of the display effect at different viewing angles can be improved. In addition, as the cavity length of the microcavity increases, the phenomenon that light with longer wavelength undergoes blue shift becomes more obvious, so that the thickness of the light extraction layer corresponding to the sub-pixel with longer wavelength can be set to be larger than that of the light extraction layer corresponding to the sub-pixel with shorter wavelength, or the refractive index of the light extraction layer corresponding to the sub-pixel with longer wavelength can be set to be smaller than that of the light extraction layer corresponding to the sub-pixel with shorter wavelength, thereby further reducing the color shift amount of the light extraction layer at the normal viewing angle and the oblique viewing angle of the sub-pixel with longer wavelength, and enabling the display effect improved by the sub-pixels with different wavelengths to be approximately the same. Therefore, when the light emitting wavelength of the first red sub-pixel is longer than that of the second red sub-pixel, the refractive index of the first light extraction layer 141 corresponding to the first red sub-pixel may be set to be smaller than that of the second light extraction layer 142 corresponding to the second red sub-pixel, and/or the thickness of the first light extraction layer 141 corresponding to the first red sub-pixel is larger than that of the second light extraction layer 142 corresponding to the second red sub-pixel, so as to reduce the color shift amount of the light extraction layer to the red sub-pixel at the normal viewing angle and the oblique viewing angle, match the attenuation degrees of red, green and blue in the light emitted from the light emitting unit, and improve the color shift problem of the display panel.
It should be noted that, since the wavelength of the green sub-pixel is smaller than that of the red sub-pixel, and the wavelength of the blue sub-pixel is smaller than that of the green sub-pixel, the thickness of the third light extraction layer 143 corresponding to the green sub-pixel in fig. 4 is smaller than that of the first light extraction layer 141 corresponding to the first red sub-pixel, and is also smaller than that of the second light extraction layer 142 corresponding to the second red sub-pixel, and the thickness of the fourth light extraction layer 144 corresponding to the blue sub-pixel is smaller than that of the third light extraction layer 143, where the thickness of the first light extraction layer 141 may be 66nm, the thickness of the second light extraction layer 142 may be 64nm, the thickness of the third light extraction layer 143 may be 60nm, and the thickness of the fourth light extraction layer 144 may be 55 nm. And/or the refractive index of the third light extraction layer 143 corresponding to the green sub-pixel is greater than the refractive index of the first light extraction layer 141 corresponding to the first red sub-pixel, and is also greater than the refractive index of the second light extraction layer 142 corresponding to the second red sub-pixel, and the refractive index of the fourth light extraction layer 144 corresponding to the blue sub-pixel is greater than the refractive index of the third light extraction layer 143 corresponding to the green sub-pixel. Here, the refractive index of the first light extraction layer 141 may be 1.859, the refractive index of the second light extraction layer 142 may be 1.86, the refractive index of the third light extraction layer 143 may be 1.88, and the refractive index of the fourth light extraction layer 144 may be 1.91.
On the basis of the above technical solutions, with reference to fig. 1, the sum of the opening area of the first red sub-pixel and the opening area of the second red sub-pixel is less than or equal to the opening area of the blue sub-pixel.
Specifically, in the light emitting unit, the emission lifetime of the blue sub-pixel is relatively short, and therefore the aperture area of the blue sub-pixel can be set to be the largest, thereby improving the lifetime of the blue sub-pixel. The red sub-pixel in the light emitting unit comprises a first red sub-pixel and a second red sub-pixel, so that the sum of the opening areas of the first red sub-pixel and the second red sub-pixel is less than or equal to the opening area of the blue sub-pixel. Generally, in an existing display panel, a red sub-pixel in a light emitting unit may be divided into a first red sub-pixel and a second red sub-pixel, that is, a sum of an opening area of the first red sub-pixel and an opening area of the second red sub-pixel is equal to an opening area of the red sub-pixel in the existing light emitting unit, so that not only the number of light emitting units (Pixels Per, PPI) in a unit area of the display panel can be ensured, but also a ratio of the opening areas of sub-Pixels of different colors of the light emitting unit is ensured to be unchanged, and a light emitting effect of the light emitting unit is ensured.
Preferably, the opening area of the first red sub-pixel and the opening area of the second red sub-pixel are equal. That is, the opening area of the first red sub-pixel and the opening area of the second red sub-pixel are half of the opening area of the red sub-pixel in the conventional light emitting unit, so that when the driving current of the first red sub-pixel is equal to the driving current of the second red sub-pixel, the luminous intensity of the first red sub-pixel is equal to the luminous intensity of the second red sub-pixel, and therefore the red sub-pixels composed of the first red sub-pixel and the second red sub-pixel have the same luminous intensity, thereby ensuring uniform light emission of the light emitting unit in different directions, and simultaneously avoiding color cast of the luminous color of the light emitting unit caused by different luminous intensities of the red sub-pixels.
On the basis of the technical solutions, the distance between the first red sub-pixel and the second red sub-pixel is greater than or equal to 24 μm. Optionally, the first red sub-pixel and the second red sub-pixel are respectively located at two sides of the green sub-pixel, and at this time, the distance between the first red sub-pixel and the second red sub-pixel is 55 μm.
Specifically, the light emitting unit includes a plurality of sub-pixels, and light emitting layers of different sub-pixels are made of different materials. Therefore, in order to fabricate the sub-pixels, it is necessary to use a precision mask to deposit different materials on the light-emitting layers of the different sub-pixels. In the evaporation process, the distance between the sub-pixels adopting different materials in the light emitting layer needs to be set to be greater than or equal to the precision of a precision mask, so that the phenomenon that the evaporation of the materials of the light emitting layer is disordered when the light emitting layer of one sub-pixel is evaporated and the materials are evaporated into the sub-pixels needing to be evaporated and another material can be avoided. And the material of the luminescent layer of the first red sub-pixel is different from that of the luminescent layer of the second red sub-pixel, so that the distance between the first red sub-pixel and the second red sub-pixel is greater than or equal to the precision of a precision mask, and illustratively, the distance between the first red sub-pixel and the second red sub-pixel is greater than or equal to 24 μm, so as to ensure that the phenomenon of disordered evaporation does not occur when the material of the luminescent layers of the first red sub-pixel and the second red sub-pixel is evaporated.
The embodiment of the invention also provides a display device. Fig. 5 is a schematic structural diagram of a display device according to an embodiment of the present invention. As shown in fig. 5, the display device 200 includes a display panel 210 according to any embodiment of the present invention. The display device 200 may be a display device with a display function, such as a mobile phone, a computer, and an intelligent wearable device, which is not limited in the embodiment of the present invention.
Since the display device 200 includes the display panel 210 provided in any embodiment of the present invention, the same advantages as the display panel 210 are obtained, and the details are not repeated herein.
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 (12)
1. A display panel includes a plurality of light emitting units;
the light-emitting unit at least comprises a first red sub-pixel, a second red sub-pixel, a green sub-pixel and a blue sub-pixel; under a specific visual angle, the color cast corresponding to the emergent light of the first red sub-pixel is equal to the color cast corresponding to the emergent light of the second red sub-pixel; under the same visual angle smaller than the specific visual angle, the color cast corresponding to the emergent light of the first red sub-pixel is larger than the color cast corresponding to the emergent light of the second red sub-pixel; and under the same visual angle larger than the specific visual angle, the color cast corresponding to the emergent light of the first red sub-pixel is smaller than the color cast corresponding to the emergent light of the second red sub-pixel.
2. The display panel of claim 1, wherein the specific viewing angle ranges from 40 ° to 60 ° with respect to a positive viewing angle, wherein the positive viewing angle is a viewing angle perpendicular to a light exit surface of the display panel, and the positive viewing angle is 0 °.
3. The display panel according to claim 1, wherein a color shift corresponding to the outgoing light of the first red sub-pixel or a color shift corresponding to the outgoing light of the second red sub-pixel is smaller than 4.5JNCD at the specific viewing angle.
4. The display panel of claim 1, wherein a first wavelength corresponding to the emitted light from the first red sub-pixel is different from a second wavelength corresponding to the emitted light from the second red sub-pixel.
5. The display panel according to claim 4,
the difference between the first wavelength and the second wavelength is greater than or equal to 10 nm.
6. The display panel according to claim 1, wherein the light emitting unit includes an anode, a cathode, and a light emitting layer between the anode and the cathode, wherein the first red sub-pixel includes a first red light emitting layer, wherein the second red sub-pixel includes a second red light emitting layer, and wherein the first red light emitting layer and the second red light emitting layer have different emission wavelengths.
7. The display panel according to claim 6, wherein the material of the first red light emitting layer comprises bis (2- (3, 5-dimethylphenyl) quinoline C2, N') (acetylacetone) iridium (III), and the material of the second red light emitting layer comprises tris (1-phenylisoquinoline) iridium (III).
8. The display panel according to claim 1, wherein a sum of an opening area of the first red subpixel and an opening area of the second red subpixel is smaller than or equal to an opening area of the blue subpixel.
9. The display panel according to claim 8, wherein an opening area of the first red subpixel and an opening area of the second red subpixel are equal.
10. The display panel of claim 1, wherein a distance between the first red subpixel and the second red subpixel is greater than or equal to 24 μ ι η.
11. The display panel according to claim 1, wherein the first red sub-pixel has an emission wavelength longer than that of the second red sub-pixel, and the display panel further comprises a light extraction layer on a light exit side of the light emitting unit;
the refractive index of the light extraction layer corresponding to the first red sub-pixel is smaller than the refractive index of the light extraction layer corresponding to the second red sub-pixel; and/or the thickness of the light extraction layer corresponding to the first red sub-pixel is greater than the thickness of the light extraction layer corresponding to the second red sub-pixel.
12. A display device comprising the display panel according to any one of claims 1 to 11.
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