CN116583146A - Display panel and display device - Google Patents
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- CN116583146A CN116583146A CN202310797227.2A CN202310797227A CN116583146A CN 116583146 A CN116583146 A CN 116583146A CN 202310797227 A CN202310797227 A CN 202310797227A CN 116583146 A CN116583146 A CN 116583146A
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Classifications
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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
- H10K59/122—Pixel-defining structures or layers, e.g. banks
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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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Abstract
The embodiment of the invention discloses a display panel and a display device, wherein the thickness of a first part of a pixel separator is at least smaller than that of a second part close to the first part, so that when a light-emitting structure is deposited, the thickness of the pixel separator at the edge of a pixel opening is relatively thinner, and the thickness of the light-emitting structure deposited on the pixel separator at the edge of the pixel opening is relatively thicker, so that the edge area of a pixel is not easy to start and lighten under low-voltage driving in a low-gray-scale light-emitting stage, the edge area of the pixel cannot emit light, the color point distribution difference under a low gray scale can be reduced, the color gamut index under the low gray scale can be further improved, and the visual angle and the service life can be further improved.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a display panel and a display device.
Background
Silicon-based OLEDs (Organic Light-Emitting diodes) relate to the field of multiple disciplines of physics, chemistry, materials, optoelectronics, microelectronics, electronic informatics, electronics and optics. The micro display is a combination of OLED technology and CMOS technology, is a cross integration of the photoelectronic industry and the microelectronic industry, promotes the development of a new generation of micro display, and also promotes the research and development of organic electronics on silicon, even molecular electronics on silicon.
The micro-display has wide market application space, and is particularly suitable for being applied to helmet displays, stereoscopic display mirrors, glasses type displays and the like. If the system is connected with a mobile communication network, a satellite positioning system and the like, accurate image information can be obtained anywhere and anytime, and the system has very important military value in military applications such as national defense, aviation, aerospace and even individual combat. For future augmented reality (Augmented Reality, abbreviated as AR) display technology, the display screen requires brightness as the most core product index, because the AR product needs to adjust the brightness of the screen body under different working environments and scenes to realize the sensory experience suitable for human eyes, especially in the outdoor direct sun mode, the brightness of the device needs to be improved.
Disclosure of Invention
The display panel and the display device provided by the embodiment of the invention are used for improving the performances of the display panel, such as color gamut, brightness and the like.
The display panel provided by the embodiment of the invention comprises:
a substrate;
a pixel defining layer located on one side of the substrate, the pixel defining layer including a plurality of pixel openings and a pixel separator surrounding the pixel openings; the pixel separator is divided into a first portion adjacent to the pixel opening and a second portion between the first portion, the thickness of the first portion being at least less than the thickness of the second portion adjacent to the first portion.
Optionally, in the display panel provided in the embodiment of the present invention, the plurality of pixel openings include a first pixel opening, a second pixel opening, and a third pixel opening that sequentially decrease wavelengths of outgoing light, and a thickness of a first portion of a periphery of the first pixel opening, a thickness of a first portion of a periphery of the second pixel opening, and a thickness of a first portion of a periphery of the third pixel opening sequentially decrease.
Optionally, in the display panel provided by the embodiment of the present invention, the display panel further includes:
the transparent anode layer is positioned between the substrate and the pixel defining layer, and comprises a plurality of anodes which are arranged at intervals and correspond to the pixel openings one by one;
the metal reflecting layers are positioned between the transparent anode layer and the substrate and are in one-to-one correspondence with the anodes;
a first insulating layer between the metal reflective layer and the substrate;
the switching metals are located between the first insulating layer and the substrate, and are electrically connected with the metal reflecting layers in a one-to-one correspondence mode through holes penetrating through the first insulating layer.
Optionally, in the display panel provided by the embodiment of the present invention, the display panel further includes:
the transparent anode layer is positioned between the substrate and the pixel defining layer, and comprises a plurality of anodes which are arranged at intervals and correspond to the pixel openings one by one;
the metal reflecting layer is positioned between the transparent anode layer and the substrate, and the whole surface of the metal reflecting layer is provided;
a first insulating layer between the metal reflective layer and the substrate;
a second insulating layer between the metal reflective layer and the transparent anode layer;
the switching metals are located between the first insulating layer and the substrate, the switching metals are electrically connected with the anodes in one-to-one correspondence through connection metals arranged in through holes penetrating through the first insulating layer, the metal reflecting layer and the second insulating layer in sequence, and the side surfaces of the connection metals are wrapped with the third insulating layer.
Optionally, in the display panel provided by the embodiment of the present invention, the metal reflective layer includes a first metal layer, a second metal layer, and a third metal layer that are stacked, where the first metal layer is close to the substrate; wherein, the liquid crystal display device comprises a liquid crystal display device,
the thickness of the second metal layer corresponding to the first pixel opening, the thickness of the second metal layer corresponding to the second pixel opening and the thickness of the second metal layer corresponding to the third pixel opening are sequentially reduced.
Optionally, in the display panel provided by the embodiment of the present invention, the pixel separator includes a first sub-separator, a second sub-separator, and a third sub-separator that are stacked, where the first sub-separator is close to the substrate; wherein, the liquid crystal display device comprises a liquid crystal display device,
the thickness of the first sub-separator at the periphery of the first pixel opening, the thickness of the first sub-separator at the periphery of the second pixel opening and the thickness of the first sub-separator at the periphery of the third pixel opening are sequentially reduced;
the thickness of the second sub-separator at the periphery of the first pixel opening, the thickness of the second sub-separator at the periphery of the second pixel opening and the thickness of the second sub-separator at the periphery of the third pixel opening are the same;
the thickness of the third sub-separator at the periphery of the first pixel opening, the thickness of the third sub-separator at the periphery of the second pixel opening, and the thickness of the third sub-separator at the periphery of the third pixel opening are the same.
Optionally, in the display panel provided by the embodiment of the present invention, the second sub-spacers around the periphery of each pixel opening are arranged at intervals, and the second sub-spacers and the first sub-spacers are aligned at the pixel opening positions;
the third sub-spacers at the periphery of each pixel opening are arranged at intervals, and the third sub-spacers are arranged on one end of the second sub-spacers away from the pixel opening so as to form an undercut structure between adjacent pixel openings.
Optionally, in the display panel provided by the embodiment of the present invention, the material of the first sub-separator and the material of the third sub-separator each include silicon oxide, and the material of the second sub-separator includes silicon nitride.
Optionally, in the display panel provided by the embodiment of the present invention, the display panel further includes:
a first light emitting structure located in the pixel opening;
a charge generation layer located on a side of the first light emitting structure facing away from the substrate, adjacent the charge generation layer being disconnected at the undercut structure location;
a second light emitting structure located at one side of the charge generation layer away from the substrate;
and the cathode is positioned on one side of the second light-emitting structure, which is away from the substrate.
Optionally, in the display panel provided by the embodiment of the present invention, the first light emitting structure includes a first hole injection layer, a first hole transport layer, a first light emitting layer, a second light emitting layer, and a first electron transport layer that are sequentially stacked, and the second light emitting structure includes a second hole injection layer, a second hole transport layer, a third light emitting layer, a second electron transport layer, and an electron injection layer that are sequentially stacked; wherein, the liquid crystal display device comprises a liquid crystal display device,
the light wavelength emitted by the first light-emitting layer, the light wavelength emitted by the second light-emitting layer and the light wavelength emitted by the third light-emitting layer are sequentially reduced.
Optionally, in the display panel provided by the embodiment of the invention, the first light emitting layer is a red light emitting layer, the second light emitting layer is a green light emitting layer, and the third light emitting layer is a blue light emitting layer.
Optionally, in the display panel provided by the embodiment of the present invention, the color of the outgoing light of the first pixel opening is red, the color of the outgoing light of the second pixel opening is green, and the color of the outgoing light of the third pixel opening is blue.
Optionally, in the display panel provided by the embodiment of the present invention, the display panel further includes:
the packaging layer is arranged on one side of the cathode, which is away from the substrate;
the black matrix layer is arranged on one side, away from the substrate, of the packaging layer, and comprises second openings which are arranged in one-to-one correspondence with the pixel openings;
the color filter layer comprises a plurality of color films with different colors, and each color film is arranged in the corresponding second opening;
and the cover plate is arranged on one side of the black matrix layer and one side of the color filter layer, which is away from the substrate.
Optionally, in the display panel provided by the embodiment of the invention, the display panel further includes a fourth insulating layer located between the substrate and the switching metal, and a driving layer located between the fourth insulating layer and the substrate; the switching metal is electrically connected with the driving layer through a through hole penetrating through the fourth insulating layer.
Correspondingly, the embodiment of the invention also provides a display device which comprises the display panel provided by the embodiment of the invention.
The embodiment of the invention has the following beneficial effects:
according to the display panel and the display device disclosed by the embodiment of the invention, the thickness of the first part of the pixel separator is at least smaller than that of the second part, which is close to the first part, so that when the light-emitting structure is deposited, the thickness of the pixel separator at the edge of the pixel opening is relatively thinner, and the thickness of the light-emitting structure deposited on the pixel separator at the edge of the pixel opening is relatively thicker, so that the edge area of the pixel is not easy to start and lighten under low-voltage driving in the low-gray-scale light-emitting stage, the edge area of the pixel does not emit light, the color point distribution difference under low gray scales can be reduced, the color gamut index under the low gray scales can be further improved, and the visual angle and the service life can be further improved.
Drawings
Fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a specific structure of the first light emitting structure and the second light emitting structure;
fig. 4 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another display panel according to an embodiment of the present invention;
FIG. 6 is a schematic diagram showing the actual performance of a B pixel unit at a gray scale of 0-255 obtained by using the display panel structure according to the embodiment of the present invention;
FIG. 7 is a schematic diagram of color point distribution of RGB three colors;
FIG. 8 is a schematic diagram showing an improvement of white light spectrum obtained by using the display panel structure according to the embodiment of the present invention;
fig. 9 is an illustration of the effect of the improved color shift locus image display according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The thickness and shape of the films in the drawings do not reflect the actual scale of the display panel, and are intended to illustrate the invention only.
When the OLED device is used as a micro display application, the existing full-color domain technology adopts a white light+color film mode, and high image resolution (i.e., pixels Per Inch (PPI) can not be realized due to the limitation of a Fine Metal Mask (FMM). In addition, the full color form of the white light plus color film limits the advantage of higher color gamut of the OLED itself, and the color gamut of the white light plus color film is about 80%.
For the current silicon-based OLED device, the lamination structure of the light emitting structure (EL) generally adopts an EL structure of y+b, where Y is a lamination structure of R light emitting units and G light emitting units, R and G are located in a lower layer unit of the EL, and B light emitting units are located in an upper layer light emitting unit of the EL, a charge generating layer is disposed between Y and B, in order to prevent the problem of crosstalk between adjacent pixels, a Pixel Defining Layer (PDL) is generally configured as an undercut structure, so that the PDL is thicker, resulting in a thinner thickness of the light emitting structure deposited on the PDL, and therefore, an edge region of the pixel is easily turned on under low voltage driving in a low gray level light emitting stage, so that the edge region of the pixel emits light, resulting in an increase in a low gray level color point distribution difference, and thus affecting a low gray level color gamut index.
In view of this, in order to enhance the color gamut in the low gray scale light emitting stage, the embodiment of the present invention provides a display panel, as shown in fig. 1 and 2, including:
a substrate 1;
a pixel defining layer 2 located at one side of the substrate 1, the pixel defining layer 2 including a plurality of pixel openings (21, 22, and 23) and a pixel separator 24 surrounding the pixel openings (21, 22, and 23); the pixel separator 24 is divided into a first portion 241 adjacent to the pixel openings (21, 22, and 23) and a second portion 242 located between the first portions 241, the thickness of the first portion 241 being at least smaller than the thickness of the second portion 242 adjacent to the first portion 241.
According to the display panel provided by the embodiment of the invention, the thickness of the first part of the pixel separator is at least smaller than that of the second part, which is close to the first part, so that when the light-emitting structure is deposited, the thickness of the pixel separator at the edge of the pixel opening is relatively thinner, and the thickness of the light-emitting structure deposited on the pixel separator at the edge of the pixel opening is relatively thicker, so that the edge area of the pixel is not easy to start and lighten under low-voltage driving in the low-gray light-emitting stage, the edge area of the pixel does not emit light, the color point distribution difference under low gray level can be reduced, the color gamut index under low gray level can be improved, and the visual angle and the service life can be improved.
In particular, in the display panel provided in the embodiment of the present invention, as shown in fig. 1 and 2, the plurality of pixel openings includes the first pixel opening 21, the second pixel opening 22 and the third pixel opening 23, in which the wavelength of the outgoing light decreases in sequence, and the thickness of the first portion 241 at the periphery of the first pixel opening 21, the thickness of the first portion 241 at the periphery of the second pixel opening 22 and the thickness of the first portion 241 at the periphery of the third pixel opening 23 decrease in sequence. Alternatively, the color of the light emitted from the first pixel opening 21 may be red (i.e., R light emitting unit is the same as R light emitting unit), the color of the light emitted from the second pixel opening 22 may be green (i.e., G light emitting unit), and the color of the light emitted from the third pixel opening 23 may be blue (i.e., B light emitting unit). By setting the thickness of the first portion 241 of the pixel separator 24 corresponding to the B light emitting unit to be thinnest, the light emitted by the B light emitting unit can be concentrated in the effective central light emitting area of the third pixel opening 23 during the low gray scale light emitting stage, so that the color point distribution difference of the B light emitting unit during the low gray scale light emitting stage can be reduced, and the low gray scale color gamut index can be further improved.
In a specific implementation, in the display panel provided by the embodiment of the present invention, as shown in fig. 1 and fig. 2, the display panel further includes:
a transparent anode layer 3 located between the substrate 1 and the pixel defining layer 2, the transparent anode layer 3 including a plurality of anodes 31 arranged at intervals and in one-to-one correspondence with the pixel openings;
a metal reflective layer 4 located between the transparent anode layer 3 and the substrate 1;
a first light emitting structure 5 located within the pixel openings (21, 22 and 23);
a charge generation layer 6 on a side of the first light emitting structure 5 facing away from the substrate 1;
a second light emitting structure 7 on a side of the charge generation layer 6 facing away from the substrate 1;
and a cathode 8 at a side of the second light emitting structure 7 facing away from the substrate 1.
Specifically, a microcavity is formed between the cathode 8 and the metal reflecting layer 4, so that the microcavity length adjustment of the OLED device can be realized, and higher color gamut and brightness can be obtained. Microcavity refers to the optical length of two mirror facets. The device with strong microcavity effect is formed by adopting the reflective metal and the semi-transparent semi-reflective metal to form the electrodes at the two ends of the OLED device, and the reflective mirror surfaces are respectively formed by adopting the metal reflective layer 4 and the Ti/Al/TiN material due to the strong reflective effect of the metal electrode, such as Mg-Ag material for the cathode 8, so that the light beams directly emitted by the light emitting structure and the light beams reflected by the metal interface interfere with each other, the OLED device with the structure with strong microcavity effect can narrow the electroluminescent spectrum, and further the color purity is improved, which is beneficial to display application.
In particular, in the display panel provided in the embodiment of the present invention, as shown in fig. 1 and 2, the metal reflective layer 4 includes a first metal layer 41, a second metal layer 42, and a third metal layer 43 that are stacked, where the first metal layer 41 is close to the substrate 1; wherein, the liquid crystal display device comprises a liquid crystal display device,
the thickness of the second metal layer 42 corresponding to the first pixel opening 21, the thickness of the second metal layer 42 corresponding to the second pixel opening 22, and the thickness of the second metal layer 42 corresponding to the third pixel opening 23 decrease in order. In such a way, the display panel of the Micro light emitting device (Micro OLED) meeting the strong microcavity (strong cavity) effect can change the microcavity length (the distance between the first metal layer 41 and the cathode 8) by adjusting the thickness of the second metal layer 42 corresponding to different pixel openings, so that RGB in the white light OLED device respectively has respective microcavity optical paths, the light modulation effect of a single light emitting device monomer under the condition of meeting the strong microcavity is realized, and the structure of the white light OLED and the color film can obtain high color gamut and high brightness without using FMM; and the method does not need to rely on a semiconductor factory, thereby being beneficial to reducing the cost. The method is particularly suitable for the requirements of the OLED device with high color gamut and high PPI in the micro-display technology of the micro-light emitting device.
Specifically, the material of the first metal layer 41 may be Ti, the material of the second metal layer 42 may be aluminum, the material of the third metal layer 43 may be titanium nitride, and the metal reflective layer 4 is configured as a multi-layer metal structure, which is beneficial to enhancing the conductivity and light reflection performance of the metal reflective layer 4.
In a specific implementation, in the display panel provided by the embodiment of the present invention, as shown in fig. 1, the number of the metal reflective layers 4 may be plural, and the plural metal reflective layers 4 are disposed at intervals, and the metal reflective layers 4 are in one-to-one correspondence with the anodes 31; the display panel further includes:
a first insulating layer 9 between the metal reflective layer 4 and the substrate 1;
the plurality of transfer metals 10 are located between the first insulating layer 9 and the substrate 1, and the transfer metals 10 are electrically connected with the metal reflecting layer 4 in a one-to-one correspondence through holes penetrating through the first insulating layer 9.
Alternatively, the transit metal 10 may include a fourth metal layer 101, a fifth metal layer 102, and a sixth metal layer 103 that are stacked, where the material of the fourth metal layer 101 may be Ti, the material of the fifth metal layer 102 may be Al, and the material of the sixth metal layer 103 may be Ti, but is not limited thereto.
Wherein a via hole is provided in the first insulating layer 9, in which a conductive material, preferably tungsten, is provided to form the communication post 91, the sixth metal layer 103 and the first metal layer 41 being connected by tungsten. Tungsten has good conductivity and process matching, the normal signal receiving of the anode 31 can be ensured by connecting the sixth metal layer 103 and the first metal layer 41 through tungsten, and the micro-cavity length is changed relatively to the cathode 8 through the first metal layer 41.
In a specific implementation, in the display panel provided by the embodiment of the present invention, as shown in fig. 2, the metal reflective layer 4 may be disposed on the whole surface, and the display panel further includes:
a first insulating layer 9 between the metal reflective layer 4 and the substrate 1;
a second insulating layer 11 between the metal reflective layer 4 and the transparent anode layer 3;
the switching metals 10 are located between the first insulating layer 9 and the substrate 1, the switching metals 10 are electrically connected with the anode 31 in a one-to-one correspondence through connection metals 12 arranged in through holes penetrating through the first insulating layer 9, the metal reflecting layer 4 and the second insulating layer 11 in sequence, and the side surfaces of the connection metals 12 are wrapped by the third insulating layer 13. By arranging the metal reflecting layers 4 as an entire surface (i.e. the metal reflecting layers 4 are shared), the anodes 31 are directly and electrically connected with the switching metal 10, and the metal reflecting layers 4 between the anodes 31 are shared (do not participate in the electrical connection), by the arrangement, the flatness of the film layer of the pixel defining layer 2 can be greatly improved, the pixel aperture ratio can be maximally improved, the reducing effect of the light emitting structure is reduced, and the conversion efficiency of the light emitting structure is greatly improved (the expected conversion efficiency can reach 70%).
Alternatively, the material of the connecting metal 12 may be tungsten, or may be other metals, which is not limited in the embodiment of the present invention.
Alternatively, the material of the transparent anode layer may be ITO, and the materials of the first, second, and third insulating layers may be silicon oxide, silicon nitride, or the like.
In particular, in the above-mentioned display panel provided in the embodiment of the present invention, as shown in fig. 1 and 2, the pixel separator 24 includes a first sub-separator 243, a second sub-separator 244, and a third sub-separator 245 that are stacked, where the first sub-separator 243 is close to the substrate 1; wherein, the liquid crystal display device comprises a liquid crystal display device,
the thickness of the first sub-separator 243 around the first pixel opening 21, the thickness of the first sub-separator 243 around the second pixel opening 22, and the thickness of the first sub-separator 243 around the third pixel opening 23 decrease in order;
the thickness of the second sub-separator 244 around the first pixel opening 21, the thickness of the second sub-separator 244 around the second pixel opening 22, and the thickness of the second sub-separator 244 around the third pixel opening 23 are the same;
the thickness of the third sub-spacer 245 around the first pixel opening 21, the thickness of the third sub-spacer 245 around the second pixel opening 22, and the thickness of the third sub-spacer 245 around the third pixel opening 23 are the same. In this way, the thickness of the first portion 241 of the pixel separator 24 corresponding to the B light emitting unit is set to be thinnest, so that during the low gray scale light emitting stage, the light emitted by the B light emitting unit can be concentrated in the effective central light emitting area of the third pixel opening 23, and thus the color point distribution difference of the B light emitting unit during the low gray scale light emitting stage can be reduced, and further the low gray scale color gamut index is further improved.
In particular, in the display panel provided by the embodiment of the present invention, as shown in fig. 1 and 2, the second sub-spacers 244 around the periphery of each pixel opening (21, 22 and 23) are arranged at intervals, and the second sub-spacers 244 and the first sub-spacers 243 are aligned at the positions of the pixel openings (21, 22 and 23);
the third sub-spacers 245 around the periphery of each pixel opening (21, 22 and 23) are disposed at intervals, and the third sub-spacers 245 are disposed on one end of the second sub-spacers 244 away from the pixel openings (21, 22 and 23) to form an undercut structure between adjacent pixel openings (21, 22 and 23). In this way adjacent charge generation layers 6 can be disconnected at the undercut structure locations, avoiding the problem of cross-talk of adjacent pixels.
In a specific implementation, in the display panel provided in the embodiment of the present invention, as shown in fig. 1 and 2, the material of the first sub-separator 243 and the material of the third sub-separator 245 may each include silicon oxide, and the material of the second sub-separator 244 may include silicon nitride. This facilitates the formation of the pixel defining layer 2 of the undercut structure.
In a specific implementation, in the display panel provided in the embodiment of the present invention, as shown in fig. 1, 2 and 3, fig. 3 is a schematic diagram of a specific structure of the first light emitting structure 5 and the second light emitting structure 7 in fig. 1 and 2, where the first light emitting structure 5 includes a first hole injection layer 51, a first hole transport layer 52, a first light emitting layer 53, a second light emitting layer 54 and a first electron transport layer 55 that are sequentially stacked, and the second light emitting structure 7 includes a second hole injection layer 71, a second hole transport layer 72, a third light emitting layer 73, a second electron transport layer 74 and an electron injection layer 75 that are sequentially stacked; wherein, the liquid crystal display device comprises a liquid crystal display device,
the wavelength of light emitted from the first light emitting layer 53, the wavelength of light emitted from the second light emitting layer 54, and the wavelength of light emitted from the third light emitting layer 58 decrease in order. Alternatively, the first light emitting layer 53 may be a red light emitting layer, the second light emitting layer 54 may be a green light emitting layer, and the third light emitting layer 58 may be a blue light emitting layer. That is, the three RGB color light emitting layers are in the same pixel opening, so that the structure of the white OLED device is realized, the white light is emitted, and each pixel opening adopts the stacked device type to meet the requirements of brightness and color gamut.
In a specific implementation, in the display panel provided by the embodiment of the present invention, as shown in fig. 4 and fig. 5, the display panel further includes:
an encapsulation layer 14 arranged on the side of the cathode 8 facing away from the substrate 1; encapsulation layer 14 may be a polymer and ceramic film encapsulation layer;
a black matrix layer 15 disposed on a side of the encapsulation layer 14 facing away from the substrate 1, the black matrix layer 15 including second openings (151, 152, 153) disposed in one-to-one correspondence with the pixel openings (21, 22, and 23); wherein 151 corresponds to the first pixel opening 21, 152 corresponds to the second pixel opening 22, and 153 corresponds to the third pixel opening 23;
a color filter layer 16 including a plurality of color films (e.g., red color film R, green color film G, and blue color film B) of different colors, each color film being disposed within a corresponding second opening (151, 152, 153); the second metal layer 43 is used for adjusting the micro-cavity length of the white light OLED device, and the color filter layer 16 is matched to filter the passing light, so that only red light passing through the red color film, only green light passing through the green color film and only blue light passing through the blue color film can be obtained, on one hand, the color coordinates of a single color point are improved, and on the other hand, the brightness of the light wave length adjusting device can be matched, so that a higher color gamut and a higher brightness are obtained;
and a cover plate 17 disposed on a side of the black matrix layer 15 and the color filter layer 16 facing away from the substrate 1, and the cover plate 17 may be a glass cover plate.
In a specific implementation, in the display panel provided in the embodiment of the present invention, as shown in fig. 1, fig. 2, fig. 4, and fig. 5, the display panel further includes: a fourth insulating layer 18 between the substrate 1 and the transit metal 10, and a driving layer 19 between the fourth insulating layer 18 and the substrate 1; the transit metal 10 is electrically connected to the driving layer 19 through a via hole penetrating the fourth insulating layer 18. The driving layer 19 may include a pixel driving, a gate driving (Gate driver On Array, abbreviated as GOA) and a previous IC driving part.
Optionally, the display panel provided in the embodiment of the present invention is a silicon-based OLED display panel, and the substrate may be a wafer substrate.
In specific implementation, the above manufacturing method provided by the embodiment of the present invention further includes manufacturing other functional film layers that are well known to those skilled in the art, and will not be described in detail herein.
As shown in fig. 6 and fig. 7, fig. 6 shows the actual performance of the B pixel unit at the gray scale of 0-255 obtained by adopting the display panel structure provided by the embodiment of the invention, and fig. 7 shows the color point distribution of RGB three colors, so that the color point distribution of RGB three colors is more concentrated, and the color gamut can be improved.
As shown in fig. 8, fig. 8 shows an improvement of a white light spectrum obtained by using the display panel structure provided by the embodiment of the present invention, the spectrum a is a white light spectrum in the prior art, and the spectrum B is a white light spectrum obtained by using the embodiment of the present invention, and it can be seen that the white light spectrum obtained by using the embodiment of the present invention has a greater improvement effect on the RG peak position.
As shown in fig. 9, fig. 9 is a schematic diagram showing an improved effect of a color cast trace image according to an embodiment of the present invention, wherein C is a standard value (0.025), D and E are both effects before improvement, F is an improved effect according to the present invention, and G is White Point.
In summary, the color point distribution difference of the display panel provided by the embodiment of the invention can be reduced, so that the color gamut index of the display panel can be improved, and the viewing angle and the service life of the display panel can be further improved.
Based on the same inventive concept, the embodiment of the invention also provides a display device, which comprises the display panel provided by the embodiment of the invention. The principle of the display device for solving the problems is similar to that of the display panel, so that the implementation of the display device can be referred to the implementation of the display panel, and the repetition is omitted herein.
In a specific implementation, the display device provided by the embodiment of the invention can be any product or component with a display function, such as a mobile phone, a tablet personal computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like. Other essential components of the display device will be understood by those skilled in the art, and are not described herein in detail, nor should they be considered as limiting the invention.
According to the display panel and the display device provided by the embodiment of the invention, the thickness of the first part of the pixel separator is at least smaller than that of the second part, which is close to the first part, so that when the light-emitting structure is deposited, the thickness of the pixel separator at the edge of the pixel opening is relatively thinner, and the thickness of the light-emitting structure deposited on the pixel separator at the edge of the pixel opening is relatively thicker, so that the edge area of the pixel is not easy to start and lighten under low-voltage driving in the low-gray-scale light-emitting stage, the edge area of the pixel does not emit light, the color point distribution difference under low gray scales can be reduced, the color gamut index under the low gray scales can be further improved, and the visual angle and the service life can be further improved.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (15)
1. A display panel, comprising:
a substrate;
a pixel defining layer located on one side of the substrate, the pixel defining layer including a plurality of pixel openings and a pixel separator surrounding the pixel openings; the pixel separator is divided into a first portion adjacent to the pixel opening and a second portion between the first portion, the thickness of the first portion being at least less than the thickness of the second portion adjacent to the first portion.
2. The display panel of claim 1, wherein the plurality of pixel openings includes a first pixel opening, a second pixel opening, and a third pixel opening having sequentially decreasing wavelengths of outgoing light, a thickness of a first portion of a periphery of the first pixel opening, a thickness of a first portion of a periphery of the second pixel opening, and a thickness of a first portion of a periphery of the third pixel opening sequentially decreasing.
3. The display panel of claim 2, further comprising:
the transparent anode layer is positioned between the substrate and the pixel defining layer, and comprises a plurality of anodes which are arranged at intervals and correspond to the pixel openings one by one;
the metal reflecting layers are positioned between the transparent anode layer and the substrate and are in one-to-one correspondence with the anodes;
a first insulating layer between the metal reflective layer and the substrate;
the switching metals are located between the first insulating layer and the substrate, and are electrically connected with the metal reflecting layers in a one-to-one correspondence mode through holes penetrating through the first insulating layer.
4. The display panel of claim 2, further comprising:
the transparent anode layer is positioned between the substrate and the pixel defining layer, and comprises a plurality of anodes which are arranged at intervals and correspond to the pixel openings one by one;
the metal reflecting layer is positioned between the transparent anode layer and the substrate, and the whole surface of the metal reflecting layer is provided;
a first insulating layer between the metal reflective layer and the substrate;
a second insulating layer between the metal reflective layer and the transparent anode layer;
the switching metals are located between the first insulating layer and the substrate, the switching metals are electrically connected with the anodes in one-to-one correspondence through connection metals arranged in through holes penetrating through the first insulating layer, the metal reflecting layer and the second insulating layer in sequence, and the side surfaces of the connection metals are wrapped with the third insulating layer.
5. The display panel of claim 3 or 4, wherein the metal reflective layer comprises a first metal layer, a second metal layer, and a third metal layer disposed in a stack, the first metal layer being adjacent to the substrate; wherein, the liquid crystal display device comprises a liquid crystal display device,
the thickness of the second metal layer corresponding to the first pixel opening, the thickness of the second metal layer corresponding to the second pixel opening and the thickness of the second metal layer corresponding to the third pixel opening are sequentially reduced.
6. The display panel of claim 5, wherein the pixel separator comprises a first sub-separator, a second sub-separator, and a third sub-separator that are stacked, the first sub-separator being adjacent to the substrate; wherein, the liquid crystal display device comprises a liquid crystal display device,
the thickness of the first sub-separator at the periphery of the first pixel opening, the thickness of the first sub-separator at the periphery of the second pixel opening and the thickness of the first sub-separator at the periphery of the third pixel opening are sequentially reduced;
the thickness of the second sub-separator at the periphery of the first pixel opening, the thickness of the second sub-separator at the periphery of the second pixel opening and the thickness of the second sub-separator at the periphery of the third pixel opening are the same;
the thickness of the third sub-separator at the periphery of the first pixel opening, the thickness of the third sub-separator at the periphery of the second pixel opening, and the thickness of the third sub-separator at the periphery of the third pixel opening are the same.
7. The display panel of claim 6, wherein the second sub-spacers at the periphery of each of the pixel openings are spaced apart and the second sub-spacers and the first sub-spacers are aligned at the pixel opening positions;
the third sub-spacers at the periphery of each pixel opening are arranged at intervals, and the third sub-spacers are arranged on one end of the second sub-spacers away from the pixel opening so as to form an undercut structure between adjacent pixel openings.
8. The display panel of claim 7, wherein the material of the first sub-separator and the material of the third sub-separator each comprise silicon oxide and the material of the second sub-separator comprises silicon nitride.
9. The display panel of claim 8, further comprising:
a first light emitting structure located in the pixel opening;
a charge generation layer located on a side of the first light emitting structure facing away from the substrate, adjacent the charge generation layer being disconnected at the undercut structure location;
a second light emitting structure located at one side of the charge generation layer away from the substrate;
and the cathode is positioned on one side of the second light-emitting structure, which is away from the substrate.
10. The display panel of claim 9, wherein the first light emitting structure comprises a first hole injection layer, a first hole transport layer, a first light emitting layer, a second light emitting layer, and a first electron transport layer, which are sequentially stacked, and the second light emitting structure comprises a second hole injection layer, a second hole transport layer, a third light emitting layer, a second electron transport layer, and an electron injection layer, which are sequentially stacked; wherein, the liquid crystal display device comprises a liquid crystal display device,
the light wavelength emitted by the first light-emitting layer, the light wavelength emitted by the second light-emitting layer and the light wavelength emitted by the third light-emitting layer are sequentially reduced.
11. The display panel of claim 10, wherein the first light emitting layer is a red light emitting layer, the second light emitting layer is a green light emitting layer, and the third light emitting layer is a blue light emitting layer.
12. The display panel of any one of claims 2-4, 6-11, wherein the color of the light exiting the first pixel opening is red, the color of the light exiting the second pixel opening is green, and the color of the light exiting the third pixel opening is blue.
13. The display panel of any one of claims 9-11, further comprising:
the packaging layer is arranged on one side of the cathode, which is away from the substrate;
the black matrix layer is arranged on one side, away from the substrate, of the packaging layer, and comprises second openings which are arranged in one-to-one correspondence with the pixel openings;
the color filter layer comprises a plurality of color films with different colors, and each color film is arranged in the corresponding second opening;
and the cover plate is arranged on one side of the black matrix layer and one side of the color filter layer, which is away from the substrate.
14. The display panel of any one of claims 3, 4, 6-11, further comprising a fourth insulating layer between the substrate and the transition metal, and a driving layer between the fourth insulating layer and the substrate; the switching metal is electrically connected with the driving layer through a through hole penetrating through the fourth insulating layer.
15. A display device comprising a display panel according to any one of claims 1-14.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310797227.2A CN116583146A (en) | 2023-06-30 | 2023-06-30 | Display panel and display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310797227.2A CN116583146A (en) | 2023-06-30 | 2023-06-30 | Display panel and display device |
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| CN116583146A true CN116583146A (en) | 2023-08-11 |
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| CN202310797227.2A Pending CN116583146A (en) | 2023-06-30 | 2023-06-30 | Display panel and display device |
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| CN (1) | CN116583146A (en) |
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2023
- 2023-06-30 CN CN202310797227.2A patent/CN116583146A/en active Pending
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