CN112164709A - Organic light emitting diode display panel, preparation method thereof and display device - Google Patents
Organic light emitting diode display panel, preparation method thereof and display device Download PDFInfo
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- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
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- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
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- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/30—Devices specially adapted for multicolour light emission
- H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
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Abstract
The invention discloses an organic light-emitting diode display panel, a preparation method thereof and a display device. The organic light emitting diode display panel is defined with a plurality of red, green and blue sub-pixel regions, and the blue sub-pixel region is provided with a blue filter film and is not provided with a photoluminescence quantum layer and is used for emitting blue light; each red sub-pixel region and each green sub-pixel region are respectively provided with a photoluminescence quantum layer and a filter film for respectively converting blue light into red light and green light. The invention can improve the light utilization efficiency, reduce the light loss, does not need a polaroid and simplifies the manufacturing process.
Description
Technical Field
The invention relates to the technical field of display, in particular to an organic light emitting diode display panel, a preparation method thereof and a display device.
Background
Compared with a liquid crystal display, an Active Matrix Organic Light Emitting Diode (AMOLED) has high contrast, viewing angle, moving image response speed and the like, so that the AMOLED is increasingly applied to smart phone screens and is a substitute for LCD screens. Along with the expansion of the application field of the AMOLED display screen on the smart phone, higher requirements are put forward on the display quality: such as larger display viewing angle, lower power consumption, etc.
At present, three display technologies of an Organic Light Emitting Diode (OLED) panel are available, namely red, green and blue (RGB) parallel pixels for independently emitting light, light and color conversion, a color filter film, and the like. The red, green and blue pixel independent light emitting technology needs to utilize a precise metal mask (FMM) and a pixel precise alignment technology (CCD), five FMMs and CCD high-precision alignment technologies are needed in the preparation process, the problems of complex process, low yield, high preparation cost and the like exist, and the precise mask technology has high difficulty in high-resolution full-color display. The key of the light color conversion technology and the color filter film technology is to improve the purity and the light utilization rate, reduce the light loss, eliminate the external light interference and the like. Usually, the color filter can cause up to three-quarters of the light loss, and meanwhile, most of the current display screens are also adhered with a polarizer to remove the interference light, and the polarizer also causes more than 50% of the light to be lost.
Therefore, how to improve the light utilization efficiency, reduce the light loss, eliminate the external light interference, and simplify the display panel process is a problem to be further solved.
Disclosure of Invention
Embodiments of the present invention provide an organic light emitting diode display panel, a method for manufacturing the same, and a display device, which can improve light utilization efficiency, reduce light loss, eliminate interference light, and simplify a display panel manufacturing process.
An embodiment of the present invention provides an organic light emitting diode display panel, including:
a substrate;
a Thin Film Transistor (TFT) array layer formed on the substrate;
a pixel defining layer formed on the TFT array layer and having a plurality of openings therethrough;
a plurality of blue organic light emitting diode devices respectively formed in the openings for emitting blue light;
a first encapsulation layer at least covering the pixel defining layer and the blue organic light emitting diode device; a planarization layer covering the first encapsulation layer; and
a black matrix layer formed on the planarization layer and having a plurality of trenches respectively corresponding to the openings, the trenches defining a plurality of sub-pixel regions; the sub-pixel regions comprise a plurality of red sub-pixel regions, a plurality of green sub-pixel regions and a plurality of blue sub-pixel regions;
each red sub-pixel region and each green sub-pixel region are respectively provided with a photoluminescence quantum layer and a filter film, and the photoluminescence quantum layers and the filter films are used for converting the blue light into red light and green light respectively; the blue sub-pixel region is provided with a blue filter film and is not provided with a photoluminescence quantum layer.
Further, in each of the red sub-pixel regions and each of the green sub-pixel regions, the filter is disposed on a side of the photoluminescence quantum layer away from the planarization layer.
Furthermore, a red photoluminescence quantum layer and a red filter film are arranged in each red sub-pixel region; and a green photoluminescence quantum layer and a green filter film are arranged in each green sub-pixel region.
Further, the blue light organic light emitting diode device comprises an anode layer, a blue light organic light emitting layer and a cathode layer which are stacked from bottom to top; the anode layer is located at the bottom of the opening.
Further, a second packaging layer is arranged between the planarization layer and the black matrix layer; the second encapsulation layer covers the planarization layer.
The invention also provides a preparation method of the organic light-emitting diode panel, which comprises the following steps:
step S1, providing a substrate, and preparing a TFT array layer on the substrate;
step S2, preparing a pixel definition layer on the TFT array layer, and forming a plurality of through openings on the pixel definition layer;
step S3, preparing a blue organic light emitting diode device in the opening of the pixel defining layer respectively;
step S4, preparing a first encapsulation layer at least covering the pixel defining layer and the blue organic light emitting diode device;
step S5, preparing a planarization layer to cover the first encapsulation layer;
step S6, preparing a black matrix layer, where the black matrix layer has a plurality of trenches corresponding to the openings, respectively, and the trenches define a plurality of sub-pixel regions; wherein the sub-pixel regions comprise a plurality of red sub-pixel regions, a plurality of green sub-pixel regions and a plurality of blue sub-pixel regions; and
step S7, preparing a photoluminescence quantum layer and a filter in each of the red sub-pixel regions and each of the green sub-pixel regions, and preparing a blue filter in each of the blue sub-pixel regions without preparing a photoluminescence quantum layer.
Further, the preparation method of the blue light organic light emitting diode device comprises the following steps:
preparing an anode layer at the bottom of the opening of each of the pixel defining layers;
preparing a blue organic light emitting layer over the anode layer; and
and preparing a cathode layer on the blue light organic light-emitting layer.
Further, the following steps are also included between step S5 and step S6: and preparing a second packaging layer to cover the planarization layer.
Further, in step S7, in each of the red sub-pixel regions and each of the green sub-pixel regions, the filter is disposed on a side of the photoluminescence quantum layer away from the planarization layer.
Further, in step S7, a red photoluminescence quantum layer and a red filter are disposed in each of the red sub-pixel regions; and a green photoluminescence quantum layer and a green filter film are arranged in each green sub-pixel region.
The invention also provides an organic light emitting diode display device which comprises the organic light emitting diode panel.
The invention has the beneficial effects that:
the blue light organic light emitting diode device is connected with the photoluminescence quantum layer, and the color film is arranged on the photoluminescence quantum layer, so that the blue light emitted by the blue light organic light emitting diode device excites the photoluminescence quantum layer, the photoluminescence quantum layer respectively emits green light and red light, the blue light is converted into green light and red light, the green light and the blue light are respectively filtered out through the color filter film, and full-color display is further realized. Compared with the scheme that the full-color display is realized by adopting a white light organic light emitting diode device to emit white light and filtering red light, green light and blue light from the white light through a color filter film in the prior art, the scheme of the invention can obviously improve the light utilization rate and reduce light loss, the light utilization rate can reach more than 80 percent, and more light is transmitted and utilized, thereby being beneficial to the improvement of the display life of the organic light emitting diode.
The invention adopts the blue light source as the initial light source, and the photoluminescence quantum layer can convert the blue light source into the red light source and the green light source, and the interference light source in the converted light source is less, so the normal display can be realized without the filtering of the polaroid.
The preparation method does not need to adopt a precise mask technology, and greatly simplifies the manufacturing process and saves the production cost compared with a white light OLED device which needs to prepare about 20 film layers.
Drawings
The technical solution and other advantages of the present invention will become apparent from the following detailed description of specific embodiments of the present invention, which is to be read in connection with the accompanying drawings.
Fig. 1 is a schematic structural diagram of an oled display panel according to an embodiment of the present invention.
Fig. 2 is a schematic diagram illustrating steps S1 to S2 performed in the method for manufacturing an oled display panel according to an embodiment of the invention.
Fig. 3 is a schematic diagram illustrating the step S3 executed in the method for manufacturing an oled display panel according to the embodiment of the invention.
Fig. 4 is a schematic diagram illustrating the step S4 executed in the method for manufacturing an oled display panel according to the embodiment of the invention.
Fig. 5 is a schematic diagram illustrating the step S5 executed in the method for manufacturing an oled display panel according to the embodiment of the invention.
Fig. 6 is a schematic diagram illustrating a second encapsulation layer prepared in the method for preparing an oled display panel according to the embodiment of the invention.
Fig. 7 is a schematic diagram illustrating the step S6 executed in the method for manufacturing an oled display panel according to the embodiment of the invention.
Fig. 8 to 9 are schematic diagrams illustrating the step S7 executed in the method for manufacturing an oled display panel according to the embodiment of the invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.
The invention can be applied to the fields of mobile phones, televisions, medical high-resolution display, organic light emitting diodes, flexible displays, high-efficiency display, Virtual Reality (VR) or Augmented Reality (AR) and the like.
Specifically, referring to fig. 1 to 9, an embodiment of the invention provides an organic light emitting diode display panel, including: the organic light emitting diode display comprises a substrate 100, a TFT array layer 200, a pixel definition layer 300, a plurality of blue organic light emitting diode devices 400, a first packaging layer 500, a planarization layer 600, a black matrix layer 800, a photoluminescence quantum layer 900 and a filter film 1000.
As shown in fig. 1 and 2, the TFT array layer 200 is formed on the substrate 100.
As shown in fig. 1 and 2, the pixel defining layer 300 is formed on the TFT array layer 200 and has a plurality of openings 310 therethrough. In one embodiment, the plurality of openings 310 of the pixel definition layer 300 are distributed in an array.
As shown in fig. 1 and 3, the plurality of blue organic light emitting diode devices 400 are respectively formed in the openings 310 for emitting blue light. In one embodiment, the blue organic light emitting diode device 400 includes an anode layer 410, a blue organic light emitting layer 420 and a cathode layer 430 stacked from bottom to top. Wherein the anode layer 410 is located at the bottom of the opening 310. Specifically, the anode layer 410 covers the bottom of the opening 310, the blue organic light emitting layer 420 covers the anode layer 410, and the cathode layer 430 covers the blue organic light emitting layer 420.
As shown in fig. 1 and 4, the first encapsulation layer 500 covers at least the pixel defining layer 300 and the blue organic light emitting diode device 400. In one embodiment, the first encapsulation layer 500 also covers a portion of the TFT array layer 200. The first encapsulation layer 500 serves to achieve the function of a water oxygen barrier.
As shown in fig. 1 and 5, the planarization layer 600 covers the first encapsulation layer 500.
As shown in fig. 1 and 7, the black matrix layer 800 is formed on the planarization layer 600 and has a plurality of trenches 810 corresponding to the positions of the openings 310, respectively, and the plurality of trenches 810 define a plurality of sub-pixel regions; the plurality of sub-pixel regions includes a plurality of red sub-pixel regions 820, a plurality of green sub-pixel regions 830, and a plurality of blue sub-pixel regions 840. Specifically, the plurality of trenches 810 penetrate through the black matrix layer 800, each trench 810 is correspondingly disposed above one of the openings 310, and since one blue organic light emitting diode device 400 is disposed in each opening 310, one blue organic light emitting diode device 400 is correspondingly disposed below each trench 810, so that blue light emitted by the blue organic light emitting diode device 400 is incident into the corresponding trench 810 above the blue organic light emitting diode device 400. In one embodiment, the black matrix layer 800 is made of a black light absorbing material to block a non-open region above the pixel defining layer 300, so as to prevent blue light from being emitted from a non-groove region of the black matrix layer 800 (i.e., a region between two adjacent grooves 810 on the black matrix layer 800). In one embodiment, the plurality of grooves 810 of the black matrix layer 800 are arranged in an array.
As shown in fig. 1, 8 and 9, each of the red sub-pixel regions 820 and each of the green sub-pixel regions 830 has a photoluminescence quantum layer 900 and a filter 1000 disposed therein for converting the blue light into red light and green light, respectively; the blue sub-pixel region 840 is provided with the blue filter 1030 and is not provided with the photoluminescence quantum layer 900. In one embodiment, the filter 1000 is disposed on a side of the photoluminescence quantum layer 900 away from the planarization layer 600 in each of the red sub-pixel regions 820 and each of the green sub-pixel regions 830. In one embodiment, each of the red sub-pixel regions 820 has a red photoluminescence quantum layer 910 and a red filter 1010 disposed therein; a green photoluminescence quantum layer 920 and a green filter 1020 are disposed in each of the green sub-pixel regions 830. Wherein the red filter 1010 is disposed on a side of the red photoluminescence quantum layer 910 away from the planarization layer 600; the green filter 1020 is disposed on a side of the green photoluminescence quantum layer 920 away from the planarization layer 600. The red photoluminescence quantum layer 910 in this embodiment can emit red light when excited by blue light, so as to convert the blue light emitted by the blue organic light emitting diode device 400 into red light; the green photoluminescence quantum layer 920 may emit green light when excited by blue light for converting the blue light emitted by the blue organic light emitting diode device 400 into green light; the red filter film 1010 is used for filtering out red light; the green filter film 1020 is used for filtering out green light; the blue filter 1030 is used to filter out blue light.
Referring to fig. 1 and 6, in an embodiment, a second encapsulation layer 700 is further disposed between the planarization layer 600 and the black matrix layer 800; the second encapsulation layer 700 covers the planarization layer 600. The second encapsulation layer 700 realizes the function of blocking water and oxygen, and further enhances the effect of blocking water and oxygen.
Referring to FIG. 1, B represents blue light, R represents red light, and G represents green light. In this embodiment, the blue light organic light emitting diode device 400 emits blue light, and the blue light is emitted into the groove 810 (i.e., the red sub-pixel region 820) having the red photoluminescence quantum layer 910, so that the red photoluminescence quantum layer 910 emits red light under the excitation of the blue light, and the red light is filtered out by the red filter 1010, so that the red sub-pixel region 820 emits red light; the blue light is emitted into the groove 810 (i.e., the green sub-pixel region 830) with the green photoluminescence quantum layer 920, so that the green photoluminescence quantum layer 920 emits green light under the excitation of the blue light, and the green light is filtered out by the green filter 1020, so that the green sub-pixel region 830 emits green light; the blue light is incident into the groove 810 (i.e., the blue sub-pixel region 840) where only the blue filter 1030 is disposed and the photoluminescence quantum layer 900 is not disposed, and the blue filter 1030 filters the blue light into purer blue light and emits the filtered blue light, so that the blue sub-pixel region 840 emits blue light, which, together with the red light emitted from the red sub-pixel region 820 and the green light emitted from the green sub-pixel region 830, realizes a full color display.
In the prior art, a white organic light emitting diode device is adopted to emit white light, and red, green and blue light is respectively filtered from the white light through a color filter film to realize full-color display, the light utilization rate of the scheme is only about 20%, and light loss can be up to three-fourths. The embodiment can significantly improve the light utilization rate and reduce the light loss, the light utilization rate can reach more than 80% (about 97% at most), and more light is transmitted and utilized, which is also beneficial to the improvement of the display life of the OLED. In addition, in this embodiment, a blue light source is used as an initial light source, and the photoluminescence quantum layer 900 can convert the blue light source into red and green light sources, and there are fewer interfering light sources in the converted light sources, so that normal display can be performed without polarizer filtering, and therefore, in this embodiment, a polarizer is not required to be disposed, so that the filtering loss of the polarizer to light can be avoided, that is, the light loss is further reduced, and the thickness of the display panel can be reduced without using a polarizer (the thickness of the polarizer is about 100 μm).
Specifically, referring to fig. 1 to 9, an embodiment of the present invention further provides a method for manufacturing an organic light emitting diode panel, including the following steps:
step S1, please refer to fig. 2, providing a substrate 100, and fabricating a TFT array layer 200 on the substrate 100.
Step S2, please refer to fig. 2, a pixel defining layer 300 is prepared on the TFT array layer 200, and a plurality of through openings 310 are formed on the pixel defining layer 300. Specifically, the openings 310 may be distributed in an array.
In step S3, please refer to fig. 3, the blue oled devices 400 are respectively prepared in the openings 310 of the pixel defining layer 300. Specifically, the blue organic light emitting diode device 400 may be deposited by an existing thermal evaporation technique.
In some embodiments, referring to fig. 3, the method for manufacturing the blue organic light emitting diode device 400 includes the following steps:
preparing an anode layer 410 at the bottom of the opening 310 of each of the pixel defining layers 300 to cover the bottom of the opening 310;
preparing a blue organic light emitting layer 420 over the anode layer 410; and
a cathode layer 430 is prepared on the blue organic light emitting layer 420.
Step S4, please refer to fig. 4, a first encapsulation layer 500 is prepared to at least cover the pixel defining layer 300 and the blue oled device 400. Specifically, the first encapsulation layer 500 may also cover a portion of the TFT array layer 200; the first encapsulation layer 500 may be prepared by Chemical Vapor Deposition (CVD), Atomic Layer Deposition (ALD), and the like, and the first encapsulation layer 500 realizes the function of water and oxygen barrier.
Step S5 please refer to fig. 5, a planarization layer 600 is prepared to cover the first package layer 500. Specifically, the planarization layer 600 may be prepared by using existing inkjet printing technology or existing coating technology, so as to achieve stress release of the inorganic film layer and coverage of the particles.
Step S6, please refer to fig. 7, in which a black matrix layer 800 is prepared, such that the black matrix layer 800 has a plurality of trenches 810 respectively corresponding to the positions of the openings 310, and the trenches 810 define a plurality of sub-pixel regions; wherein the sub-pixel regions include a plurality of red sub-pixel regions 820, a plurality of green sub-pixel regions 830, and a plurality of blue sub-pixel regions 840. Specifically, the plurality of trenches 810 penetrate the black matrix layer 800, and each of the trenches 810 is located corresponding to one of the openings 310 and the blue organic light emitting diode device 400 located in the opening 310, and more specifically, each of the trenches 810 is disposed above one of the openings 310 and the blue organic light emitting diode device 400 located in the opening 310, so that blue light emitted by the blue organic light emitting diode device 400 is incident into the trench 810. In one embodiment, the black matrix layer 800 is made of a black light absorbing material to block a non-opening region above the pixel defining layer 300, thereby preventing blue light from being emitted from a non-groove region of the black matrix layer 800 (i.e., a region between two adjacent grooves 810 on the black matrix layer 800). In an embodiment, the plurality of grooves 810 of the black matrix layer 800 may be arranged in an array. The black matrix layer 800 may be prepared by coating, exposing, and developing using a conventional photolithography technique.
Step S7, please refer to fig. 8 and 9, to prepare the photoluminescence quantum layer 900 and the filter 1000 in each of the red sub-pixel regions 820 and the green sub-pixel regions 830, and prepare the blue filter 1030 and not prepare the photoluminescence quantum layer 900 in each of the blue sub-pixel regions 840. Specifically, the method comprises the following steps: preparing a red photoluminescence quantum layer 910 in each of the red sub-pixel regions 820, a green photoluminescence quantum layer 920 in each of the green sub-pixel regions 830, and no photoluminescence quantum layer 900 in each of the blue sub-pixel regions 840; and forming a red filter 1010 over each of the red photoluminescent quantum layers 910, a green filter 1020 over each of the green photoluminescent quantum layers 920, and a blue filter 1030 over each of the blue sub-pixel regions 840. The photoluminescent sublayer 900 and/or the filter 1000 can be prepared by coating, exposing, and developing process steps using inkjet printing technology or photolithography technology.
In some embodiments, referring to fig. 9, in step S7, in each of the red sub-pixel regions 820 and the green sub-pixel regions 830, the filter 1000 is disposed on a side of the photoluminescence quantum layer 900 away from the planarization layer 600.
In some embodiments, referring to fig. 9, in step S7, a red photoluminescence quantum layer 910 and a red filter 1010 are disposed in each of the red sub-pixel regions 820; a green photoluminescence quantum layer 920 and a green filter 1020 are disposed in each of the green sub-pixel regions 830. Wherein the red filter 1010 is disposed on a side of the red photoluminescence quantum layer 910 away from the planarization layer 600; the green filter 1020 is disposed on a side of the green photoluminescence quantum layer 920 away from the planarization layer 600. The red photoluminescence quantum layer 910 in this embodiment can emit red light when excited by blue light, so as to convert the blue light emitted by the blue organic light emitting diode device 400 into red light; the green photoluminescence quantum layer 920 may emit green light when excited by blue light for converting the blue light emitted by the blue organic light emitting diode device 400 into green light; the red filter film 1010 is used for filtering out red light; the green filter film 1020 is used for filtering out green light; the blue filter 1030 is used to filter out blue light.
In some embodiments, please refer to fig. 6, the following steps are further included between step S5 and step S6: a second encapsulation layer 700 is prepared to cover the planarization layer 600. Specifically, the second encapsulation layer 700 may be prepared by Chemical Vapor Deposition (CVD), Atomic Layer Deposition (ALD), and the like, and the second encapsulation layer 700 realizes the function of water and oxygen barrier.
The embodiment also provides an organic light emitting diode display device, which comprises the organic light emitting diode panel.
Referring to fig. 1, in the drawing, B represents blue light, R represents red light, and G represents green light, in this embodiment, the blue light organic light emitting diode device 400 emits blue light, the blue light is emitted into the groove 810 (i.e., the red sub-pixel region 820) with the red photoluminescence quantum layer 910, so that the red photoluminescence quantum layer 910 emits red light under the excitation of the blue light, and the red light is filtered out by the red filter 1010, so that the red sub-pixel region 820 emits red light; the blue light is emitted into the groove 810 (i.e., the green sub-pixel region 830) with the green photoluminescence quantum layer 920, so that the green photoluminescence quantum layer 920 emits green light under the excitation of the blue light, and the green light is filtered out by the green filter 1020, so that the green sub-pixel region 830 emits green light; the blue light is incident into the groove 810 (i.e., the blue sub-pixel region 840) where only the blue filter 1030 is disposed and the photoluminescence quantum layer 900 is not disposed, and the blue light is filtered into purer blue light by the blue filter 1030 and then emitted, so that the blue sub-pixel region 840 emits blue light, which, together with the red light emitted by the red sub-pixel region 820 and the green light emitted by the green sub-pixel region 830, realizes a full color display.
In the prior art, a white organic light emitting diode device is adopted to emit white light, and red, green and blue light is respectively filtered from the white light through a color filter film to realize full-color display, the light utilization rate of the scheme is only about 20%, and light loss can be up to three-fourths. The embodiment can significantly improve the light utilization rate and reduce the light loss, the light utilization rate can reach more than 80% (about 97% at most), and more light is transmitted and utilized, which is also beneficial to the improvement of the display life of the OLED. In addition, in this embodiment, a blue light source is used as an initial light source, and the photoluminescence quantum layer 900 can convert the blue light source into red and green light sources, and there are fewer interfering light sources in the converted light sources, so that normal display can be performed without polarizer filtering, and therefore, in this embodiment, a polarizer is not required to be disposed, so that the filtering loss of the polarizer to light can be avoided, that is, the light loss is further reduced, and the thickness of the display panel can be reduced without using a polarizer (the thickness of the polarizer is about 100 μm). The method does not need to adopt a precise mask technology, and compared with a white light OLED device which needs to prepare about 20 film layers, the method greatly simplifies the manufacturing process and saves the production cost.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The above embodiments of the present invention are described in detail, and the principle and the implementation of the present invention are explained by applying specific embodiments, and the description of the above embodiments is only used to help understanding the technical scheme and the core idea of the present invention; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. An organic light emitting diode display panel, comprising:
a substrate;
a TFT array layer formed on the substrate;
a pixel defining layer formed on the TFT array layer and having a plurality of openings therethrough;
a plurality of blue organic light emitting diode devices respectively formed in the openings for emitting blue light;
a first encapsulation layer at least covering the pixel defining layer and the blue organic light emitting diode device;
a planarization layer covering the first encapsulation layer; and
a black matrix layer formed on the planarization layer and having a plurality of trenches respectively corresponding to the openings, the trenches defining a plurality of sub-pixel regions; the sub-pixel regions comprise a plurality of red sub-pixel regions, a plurality of green sub-pixel regions and a plurality of blue sub-pixel regions;
each red sub-pixel region and each green sub-pixel region are respectively provided with a photoluminescence quantum layer and a filter film, and the photoluminescence quantum layers and the filter films are used for converting the blue light into red light and green light respectively; the blue sub-pixel region is provided with a blue filter film and is not provided with a photoluminescence quantum layer.
2. The oled display panel of claim 1 wherein said filter is disposed on a side of said photoluminescent quantum layer remote from said planarization layer in each of said red sub-pixel regions and each of said green sub-pixel regions.
3. The oled display panel claimed in claim 2, wherein each of the red sub-pixel regions has a red photoluminescence quantum layer and a red filter film disposed therein; and a green photoluminescence quantum layer and a green filter film are arranged in each green sub-pixel region.
4. The organic light emitting diode display panel of claim 1, wherein the blue organic light emitting diode device comprises an anode layer, a blue organic light emitting layer and a cathode layer stacked from bottom to top; the anode layer is located at the bottom of the opening.
5. The organic light emitting diode display panel of claim 1, wherein a second encapsulation layer is further disposed between the planarization layer and the black matrix layer; the second encapsulation layer covers the planarization layer.
6. The preparation method of the organic light-emitting diode display panel is characterized by comprising the following steps of:
step S1, providing a substrate, and preparing a TFT array layer on the substrate;
step S2, preparing a pixel definition layer on the TFT array layer, and forming a plurality of through openings on the pixel definition layer;
step S3, preparing a blue organic light emitting diode device in the opening of the pixel defining layer respectively;
step S4, preparing a first encapsulation layer at least covering the pixel defining layer and the blue organic light emitting diode device;
step S5, preparing a planarization layer to cover the first encapsulation layer;
step S6, preparing a black matrix layer, where the black matrix layer has a plurality of trenches corresponding to the openings, respectively, and the trenches define a plurality of sub-pixel regions; wherein the sub-pixel regions comprise a plurality of red sub-pixel regions, a plurality of green sub-pixel regions and a plurality of blue sub-pixel regions; and
step S7, preparing a photoluminescence quantum layer and a filter in each of the red sub-pixel regions and each of the green sub-pixel regions, and preparing a blue filter in each of the blue sub-pixel regions without preparing a photoluminescence quantum layer.
7. The method of claim 6, wherein in step S3, the method for manufacturing the blue organic light emitting diode device comprises the following steps:
preparing an anode layer at the bottom of the opening of each of the pixel defining layers;
preparing a blue organic light emitting layer over the anode layer; and
and preparing a cathode layer on the blue light organic light-emitting layer.
8. The method of claim 6, wherein in step S7, the filter is disposed on a side of the photoluminescence quantum layer away from the planarization layer in each of the red sub-pixel regions and each of the green sub-pixel regions.
9. The method according to claim 8, wherein in step S7, a red photoluminescence quantum layer and a red filter film are disposed in each of the red sub-pixel regions; and a green photoluminescence quantum layer and a green filter film are arranged in each green sub-pixel region.
10. An organic light emitting diode display device comprising the organic light emitting diode display panel according to claim 1.
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