CN117250796A - Display panel, manufacturing method of display panel and electronic equipment - Google Patents
Display panel, manufacturing method of display panel and electronic equipment Download PDFInfo
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- CN117250796A CN117250796A CN202311524282.0A CN202311524282A CN117250796A CN 117250796 A CN117250796 A CN 117250796A CN 202311524282 A CN202311524282 A CN 202311524282A CN 117250796 A CN117250796 A CN 117250796A
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133605—Direct backlight including specially adapted reflectors
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/13363—Birefringent elements, e.g. for optical compensation
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/13718—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on a change of the texture state of a cholesteric liquid crystal
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Geometry (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
The embodiment of the application provides a display panel, a manufacturing method of the display panel and electronic equipment, and relates to the technical field of display equipment. The first electrode layer is positioned on one side of the array substrate and comprises a plurality of first electrodes arranged at intervals; the pixel defining layer is positioned on one side of the array substrate, and comprises a pixel opening exposing the first electrode; the light-emitting layer is positioned in the pixel opening; the second electrode layer comprises a concave area which corresponds to the pixel opening and is concave towards one side of the pixel opening; the selectively reflective layer is located within the recessed region. The light-emitting display panel can improve the transmissivity of light emitted by the light-emitting layer, so that the light-emitting efficiency of the display panel is improved, and the phenomenon that the brightness of the screen body is attenuated and accelerated can be improved.
Description
Technical Field
The application relates to the technical field of display equipment, in particular to a display panel, a manufacturing method of the display panel and electronic equipment.
Background
With the development of display technology, the power consumption of the light emitting device is more and more important, and the power consumption of the light emitting device is limited by the efficiency of the material of the light emitting device, however, the development progress of the material is slower, and the development period is longer.
The light extraction efficiency of the light emitting device in the related art is mainly affected by the light extraction effect, however, the related art is poor in light extraction effect through the light.
Disclosure of Invention
In order to overcome the technical problems mentioned in the background of the invention, embodiments of the present application provide a display panel including.
An array substrate;
the pixel defining layer is positioned on one side of the array substrate and comprises a plurality of pixel openings;
a light emitting layer located within the pixel opening;
the packaging layer is positioned at one side of the light-emitting layer far away from the array substrate; the packaging layer comprises a concave area which corresponds to the pixel opening and is concave towards one side of the pixel opening; the orthographic projection of the concave area on the array substrate covers the orthographic projection of the pixel opening on the array substrate;
a selectively reflective layer located within the recessed region; the orthographic projection of the selective reflecting layer on the array substrate is at least partially overlapped with the orthographic projection of the luminous layer on the array substrate.
In one possible embodiment, the orthographic projection of the light emitting layer on the array substrate is located within the orthographic projection of the selectively reflective layer on the array substrate.
In a possible implementation manner, the packaging layer further comprises a blocking layer located on one side of the pixel defining layer away from the array substrate, the blocking layer is arranged to be attached to the pixel opening, the thickness of the blocking layer located at the bottom wall of the pixel opening is the same as that of the blocking layer located on the pixel defining layer, and the selective reflecting layer is located on one side of the blocking layer away from the array substrate; the barrier layer forms the concave region at the pixel opening;
preferably, the orthographic projection of the side, away from the array substrate, of the selective reflection layer on the array substrate covers the orthographic projection of the side, away from the array substrate, of the concave region on the array substrate;
preferably, the distance between the bottom surface of the concave region and the array substrate is greater than the distance between the bottom surface of the pixel defining layer and the array substrate, and is smaller than the distance between the top surface of the pixel defining layer and the array substrate.
In one possible embodiment, the display panel further includes:
the pixel defining layer is positioned on one side of the first electrode layer far away from the array substrate, and the pixel opening exposes the first electrode;
a second electrode layer covering the light emitting layer and the pixel defining layer at a side far away from the array substrate, wherein the height of the second electrode layer in the pixel opening is lower than that of the pixel defining layer;
the packaging layer is arranged on one side of the second electrode layer far away from the array substrate.
In one possible implementation, the blocking layer is a first inorganic layer, and the encapsulation layer further includes an organic layer located on a side of the first inorganic layer away from the array substrate and covering the selectively reflective layer, and a second inorganic layer located on a side of the organic layer away from the array substrate.
In one possible implementation, the display panel further includes a 1/4 phase retardation layer located on a side of the selectively reflective layer away from the array substrate and a linear polarization layer located on a side of the 1/4 phase retardation layer away from the array substrate;
the selective reflection layer is used for reflecting one of right-handed polarized light and left-handed polarized light and transmitting the other.
In one possible implementation manner, the selective reflecting layer includes a plurality of reflecting portions disposed at intervals, a plurality of the reflecting portions are disposed corresponding to the pixel openings, and an orthographic projection of the reflecting portions on the array substrate coincides with an orthographic projection of the pixel openings on the substrate.
In one possible embodiment, the selectively reflective layer comprises cholesteric liquid crystals;
preferably, the pixel defining layer comprises a black material;
preferably, the display panel further includes a planarization layer disposed on a side of the first electrode layer near the array substrate, and the planarization layer includes a black matrix material.
In one possible embodiment, the present application further provides a method for manufacturing a display panel, where the method includes:
providing an array substrate;
forming a pixel defining layer on one side of the array substrate, the pixel defining layer including a plurality of pixel openings;
forming a light emitting layer within the pixel opening;
forming a packaging layer on one side of the light-emitting layer and the pixel defining layer away from the array substrate; the packaging layer comprises a concave area which corresponds to the pixel opening and is concave towards one side of the pixel opening; the orthographic projection of the concave area on the array substrate covers the orthographic projection of the pixel opening on the array substrate;
forming a selective reflection layer in the concave region; the orthographic projection of the selective reflecting layer on the array substrate is at least partially overlapped with the orthographic projection of the luminous layer on the array substrate.
In one possible embodiment, the present application also provides an electronic device including the display panel described herein.
Compared with the prior art, the application has the following beneficial effects:
according to the display panel, the manufacturing method of the display panel and the electronic equipment, the selective reflection layer which is closer to the light-emitting layer in distance is arranged in the concave area corresponding to the pixel opening, so that the light transmittance of the light emitted by the light-emitting layer can be improved, the light-emitting efficiency of the display panel can be improved, and the power consumption of the display panel can be reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic cross-sectional view of a display panel according to the prior art provided in this embodiment;
fig. 2 is a schematic cross-sectional view of a display panel provided in the present embodiment;
FIG. 3 is a schematic view of an optical path of light transmitted from a selective reflective layer after secondary reflection of light from a light emitting layer according to the present embodiment;
fig. 4 is a schematic cross-sectional view of a display panel including a barrier layer according to the present embodiment;
FIG. 5 is a schematic cross-sectional view of a display panel when the barrier layer provided in the present embodiment is a first inorganic layer;
fig. 6 is a schematic cross-sectional view of the display panel according to the present embodiment further including a 1/4 phase retardation layer and a linear polarization layer;
FIG. 7 is a schematic view of the light path of the light passing through the selective reflection layer, the 1/4 phase retardation layer and the linear polarization layer of the light emitting layer according to the present embodiment;
FIG. 8 is a schematic view of an optical path of external light provided by the present embodiment through the linear polarization layer, the 1/4 phase retardation layer and the selective reflection layer;
fig. 9 is a flowchart of a method for manufacturing a display panel according to the present embodiment;
fig. 10 is a schematic cross-sectional view of a first electrode layer formed on an array substrate according to the present embodiment;
FIG. 11 is a schematic cross-sectional view of a pixel defining layer formed on an array substrate according to the present embodiment;
fig. 12 is a schematic cross-sectional view of a light-emitting layer formed in a pixel opening according to the present embodiment;
fig. 13 is a schematic cross-sectional view of the second electrode layer formed on the light-emitting layer and the pixel defining layer according to the present embodiment.
Reference numerals: 1. an array substrate; 2. a light emitting layer; 3. a cover layer; 4. a black glue layer; 5. an optical adhesive; 6. a polarizing film; 7. a pixel defining layer; 71. a pixel opening; 8. a first electrode layer; 9. a selective reflection layer; 10. a second electrode layer; 101. a recessed region; 11. a barrier layer; 12. an organic layer; 13. a second inorganic layer; 14. a 1/4 phase delay layer; 15. a polarizing layer; 16. and an encapsulation layer.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the present application, it should be noted that, the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, or the azimuth or positional relationship that is commonly put when the product of the application is used, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and therefore should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
It should be noted that, in the case of no conflict, different features in the embodiments of the present application may be combined with each other.
Currently, the light emitting efficiency of a light emitting device is low, in order to reduce the reflectivity of the light emitting device to ambient light, so that the light emitting device can still display with high contrast under high-brightness ambient light, and a circular polarizer is generally added between a screen body and a protective cover plate of the light emitting device. However, the circular polarizer filters out the ambient reflected light and also makes the light emitted from the light emitting device lose more than 50%, thereby reducing the light emitting efficiency of the light emitting device.
Referring to fig. 1, the display panel in the related art includes an array substrate 1, a light emitting layer 2 disposed on one side of the array substrate 1, a cover layer 3 disposed on one side of the light emitting layer 2 away from the array substrate 1, a black matrix layer 4 disposed on one side of the cover layer 3 away from the array substrate 1, and a polarizing film 6 disposed on one side of the black matrix layer 4 away from the array substrate 1. The black glue layer 4 is provided with a hollowed hole corresponding to the light-emitting layer 2, a light filter 5 is arranged in the hollowed hole, and most of light emitted by the light-emitting layer 2 is transmitted through the light filter 5. However, some of the light is absorbed by the black matrix layer 4 and the optical filter 5, and some of the light is reflected to the black matrix layer 4 after being irradiated to the polarizing film 6, and is absorbed by the black matrix layer 4 (as indicated by an arrow in fig. 1). Thus, the problem of accelerated brightness decay of the screen is caused by poor light extraction effect.
In view of this, the present embodiment provides a solution for improving the large-angle brightness attenuation acceleration of the screen, and the solution provided in the present embodiment is described in detail below.
Referring to fig. 2 and 5, the present embodiment provides a display panel including an array substrate 1, a first electrode layer 8, a pixel defining layer 7, a light emitting layer 2, a second electrode layer 10, an encapsulation layer 16, and a selective reflection layer 9.
The array substrate 1 may include a plurality of driving units, each of which may include one or more semiconductor switching devices. The semiconductor switching device may be formed by a plurality of film layers in the array substrate 1 in cooperation, for example, the semiconductor switching device may be a thin film transistor (Thin Film Transistor, TFT) formed by a plurality of film layers in cooperation.
The first electrode layer 8 is located at one side of the array substrate 1, and the first electrode layer 8 includes a plurality of first electrodes disposed at intervals, where the first electrodes may be anodes.
The pixel defining layer 7 is located at a side of the first electrode layer 8 away from the array substrate 1, and the pixel defining layer 7 includes a pixel opening exposing the first electrode. The pixel defining layer 7 defines a plurality of pixel openings exposing at least part of the first electrode, the light emitting layer 2 being located within the pixel openings.
The second electrode layer 10 is located on one side of the light emitting layer 2 and the pixel defining layer 7 away from the array substrate 1, and the height of the second electrode layer 10 in the pixel opening is lower than the height of the pixel defining layer 7.
The encapsulation layer 16 is located at a side of the second electrode layer 10 away from the array substrate 1, the encapsulation layer 16 includes a recessed area corresponding to the pixel opening and recessed toward the pixel opening, the orthographic projection of the recessed area on the array substrate 1 covers the orthographic projection of the pixel opening on the array substrate 1, and the recessed area is located right above the pixel opening.
The selective reflection layer 9 is positioned in the concave area; the orthographic projection of the selective reflection layer 9 on the array substrate is at least partially overlapped with the orthographic projection of the light-emitting layer 2 on the array substrate. Further, the selective reflection layer 9 includes a plurality of reflection portions disposed at intervals, a plurality of reflection portions are disposed corresponding to the pixel openings, and an orthographic projection of the reflection portions on the array substrate 1 coincides with an orthographic projection of the pixel openings on the array substrate 1.
The selective reflection layer 9 can selectively reflect some light emitted by the light emitting layer 2 onto the second electrode layer 10, and then change the rotation direction of the light after secondary reflection by the second electrode layer 10, so that the light with changed rotation direction finally passes through the selective reflection layer 9.
For example, the selective reflection layer 9 may transmit the left-handed circularly polarized light and reflect the right-handed circularly polarized light with a specified wavelength, where the specified wavelength corresponds to the wavelength of the light emitted by the light emitting layer 2, for example, the light emitting layer 2 emits red light, and the selective reflection layer 9 may reflect the right-handed circularly polarized light with the red wavelength, that is, the red light emitting pixel, the green light emitting pixel, and the blue light emitting pixel respectively correspond to the respective selective reflection layers 9.
As shown in fig. 3, the light emitted from the light emitting layer 2 is split into a left-hand circularly polarized light and a right-hand circularly polarized light (the clockwise rotated arrow in fig. 3 indicates the left-hand circularly polarized light and the counterclockwise rotated arrow indicates the right-hand circularly polarized light), wherein the left-hand circularly polarized light directly passes through the selective reflection layer 9, the right-hand circularly polarized light is reflected by the selective reflection layer 9 to the second electrode layer 10, and then is reflected by the second electrode layer 10 again to be the left-hand circularly polarized light, and the reflected left-hand circularly polarized light passes through the selective reflection layer 9 again. In this way, the transmittance of light emitted from the light-emitting layer 2 can be improved.
Based on the above design, in this embodiment, by disposing the selective reflection layer 9 closer to the light emitting layer 2 in the concave region corresponding to the pixel opening, the transmittance of the light emitted by the light emitting layer 2 can be improved, so that the light emitting efficiency of the display panel can be improved, and the power consumption of the display panel can be reduced.
In a possible embodiment, the selectively reflective layer 9 comprises cholesteric liquid crystals.
The inner cholesteric liquid crystal molecules of the cholesteric liquid crystal (Cholesteric Liquid Crystal, CLC) are flat and are arranged into layers, molecules in the layers are parallel to each other, the long axes of the molecules are parallel to the layer plane, the long axes of the molecules of different layers are slightly changed, and the inner cholesteric liquid crystal molecules are arranged into a spiral structure along the normal direction of the layers. The spiral structure is in a left-handed or right-handed mode, and cholesteric liquid crystal can be divided into a left-handed cholesteric liquid crystal and a right-handed cholesteric liquid crystal according to the rotation direction of the spiral structure. When the alignment of the molecules is rotated 360 ° and returns to the original direction, the distance between the two layers where the molecules are aligned identically is called the pitch of cholesteric liquid crystal.
According to actual needs, a chiral agent or the like can be added to the cholesteric liquid crystal to change the pitch. The cholesteric liquid crystal can comprise various cholesteric liquid crystals with different pitches, and can also comprise cholesteric liquid crystals with single pitches, which is specific according to the actual situation. When light with the same wavelength as the pitch of the cholesteric liquid crystal is incident on the surface of the cholesteric liquid crystal, the cholesteric liquid crystal can show selective reflection characteristics, namely, the left-handed cholesteric liquid crystal transmits right-handed circularly polarized light and reflects left-handed circularly polarized light; the right-handed cholesteric liquid crystal transmits left-handed circularly polarized light and reflects right-handed circularly polarized light. When the wavelength of the incident light is not consistent with the pitch of the cholesteric liquid crystal, the cholesteric liquid crystal allows the entire incident light to pass through.
According to the above characteristics of the cholesteric liquid crystal, the cholesteric liquid crystal having a specified wavelength band for reflecting the left-handed circular polarized light or the right-handed circular polarized light can be set in the concave region by printing or coating etching, etc., so as to finally improve the light-emitting efficiency of the light-emitting layer 2.
In a possible embodiment, the orthographic projection of the light-emitting layer 2 on the array substrate 1 is located within the orthographic projection of the selectively reflective layer 9 on the array substrate 1. The selectively reflective layer 9 is located directly above the light emitting layer 2 (in a direction away from the array substrate 1), and the selectively reflective layer 9 may cover the light emitting layer 2. Therefore, more light can be irradiated to the selective reflecting layer 9 from the light emitting layer 2, so that more light emitted from the light emitting layer 2 is transmitted after secondary reflection, and the light emitting efficiency of the display panel can be further improved.
In a possible embodiment, referring to fig. 4, the encapsulation layer 16 further includes a blocking layer 11 located on a side of the pixel defining layer 7 away from the array substrate 1, the blocking layer 11 is disposed in a manner of fitting the pixel opening, a thickness of the blocking layer 11 at a bottom wall of the pixel opening is the same as a thickness of the blocking layer 11 located on the pixel defining layer 7, and the selectively reflecting layer 9 is located on a side of the blocking layer 11 away from the array substrate 1; the distance between the bottom surface of the concave region and the array substrate 1 is greater than the distance between the bottom surface of the pixel defining layer 7 and the array substrate 1, and less than the distance between the top surface of the pixel defining layer 7 and the array substrate 1, and the barrier layer 11 forms the concave region at the pixel opening.
The blocking layer 11 is also recessed towards the light emitting layer 2 right above the pixel opening, and the radian of the blocking layer 11 and the radian of the second electrode layer 10 towards the light emitting layer 2 are equal, namely, the radian of the blocking layer 11 and the radian of the second electrode layer 10 formed at the opening of the pixel opening are the same, so that the blocking layer 11 and the second electrode layer 10 are tightly attached, therefore, the blocking layer 11 and the second electrode layer 10 form the recessed area together at the pixel opening, and the selective reflecting layer 9 is positioned in the recessed area of the blocking layer 11. The blocking layer 11 has a role of blocking water oxygen, so that the blocking layer 11 can block water oxygen in the selectively reflecting layer 9 from entering the light emitting layer 2.
The opening area of the concave area is larger than the area of the light-emitting layer, the cross section pattern of the concave area is trapezoid or the bottom surface of the concave area is arc-shaped.
Preferably, referring again to fig. 4, the orthographic projection of the side of the selectively reflective layer 9 away from the array substrate on the array substrate 1 covers the orthographic projection of the side of the concave region away from the array substrate 1 on the array substrate 1. The concave area is filled with the selective reflection layer 9, and one side of the selective reflection layer 9 away from the array substrate 1 and one side of the barrier layer 11 away from the array substrate 1 are located in the same plane. Therefore, compared with the scheme that the black glue layer 4 shields the light with a large viewing angle emitted by the light emitting layer 2 in the related art, the selective reflection layer 9 fills the concave area, and the black glue layer 4 is not arranged any more, so that the light with the large viewing angle of the light emitting layer 2 is not shielded, and the light emitting layer 2 has a better light emitting viewing angle. Since the selective reflection layer 9 has a narrow reflection spectrum, incident light of other wavebands can penetrate through the selective reflection layer 9, so that when external light irradiates the selective reflection layer 9, only light with the same color as the corresponding light-emitting layer 2 in the external light is reflected, and the reflection of the external light can be reduced.
In one possible embodiment, referring to fig. 5, the blocking layer 11 is a first inorganic layer, and the encapsulation layer 16 further includes an organic layer 12 located on a side of the first inorganic layer away from the array substrate and covering the selectively reflective layer 9, and a second inorganic layer 13 located on a side of the organic layer 12 away from the array substrate.
The first inorganic layer may be a first encapsulation layer of the encapsulation layer 16, the organic layer 12 may be a second encapsulation layer of the encapsulation layer 16, and the second inorganic layer 13 may be a third encapsulation layer of the encapsulation layer 16. The organic layer 12 may be provided by means of ink-jet printing, the organic layer 12 having a cushioning effect.
The selective reflection layer 9 is disposed between the first packaging layer and the second packaging layer of the packaging layer 16, so that the selective reflection layer 9 is closer to the light-emitting layer 2, and more light rays of the light-emitting layer 2 are reflected and projected through the selective reflection layer 9, so that the light-emitting rate of the display panel can be further improved. In addition, since the selective reflection layer 9 is directly formed on the first encapsulation layer of the encapsulation layer, and the structure can realize the function of reducing reflection without the need of the black glue layer 4, no matter the light directly emitted from the light emitting layer 2 or the reflected light is blocked by the black glue layer 4, the problem of view angle brightness attenuation is improved.
In a possible embodiment, referring to fig. 6, the display panel further includes a 1/4 phase retardation layer 14 on a side of the selectively reflective layer 9 away from the array substrate, and a linear polarization layer 15 on a side of the 1/4 phase retardation layer 14 away from the array substrate; the selective reflection layer 9 is used for reflecting one of right-handed polarized light and left-handed polarized light and transmitting the other.
The 1/4 phase retardation layer 14 is a birefringent single crystal waveplate having a thickness such that when light is transmitted through the waveplate from normal incidence, the phase difference between ordinary and extraordinary light is equal to pi/2 or an odd multiple thereof. When the linearly polarized light is perpendicularly incident on the 1/4 phase retardation layer 14 and the polarization direction of the linearly polarized light is 45 ° to the optical axis of the pi/4 wave plate, the outgoing light is circularly polarized light, and the type of crystal constituting the plate determines whether the outgoing circularly polarized light is right-handed circularly polarized light or left-handed circularly polarized light.
When natural light passes through the linear polarization layer 15, light parallel to the transmission axis of the linear polarization layer 15 in the light is transmitted, and light perpendicular to the transmission axis of the linear polarization layer 15 is absorbed, that is, the natural light passes through the linear polarization layer 15 and is converted into linear polarized light with the polarization direction parallel to the transmission axis of the linear polarization layer 15, and the linear polarized light passes through the 1/4 phase delay layer 14 and is converted into right-handed circularly polarized light or left-handed circularly polarized light.
Referring to fig. 7, the light emitted from the light emitting layer 2 is natural light, and is detachable into left-handed circular polarized light and right-handed circular polarized light, wherein the left-handed circular polarized light can penetrate through the selective reflection layer 9 to be emitted, the right-handed polarized light with a specified wavelength is reflected by the selective reflection layer 9, and is reflected again after striking the second electrode layer 10 after being reflected, at this time, the rotation direction is changed to become left-handed circular polarized light, and the left-handed circular polarized light can sequentially pass through the selective reflection layer 9, the 1/4 phase delay layer 14 and the linear polarization layer 15 to be emitted. In this way, the right-handed polarized light which is reflected originally is emitted together, thereby enhancing the light-emitting efficiency of the display panel.
Referring to fig. 8, the light incident from the outside is also natural light, and can be disassembled into two linearly polarized light beams in the vertical direction, the S polarization beams can pass through the linearly polarized light layer, and pass through the 1/4 phase retardation layer 14 to be changed into circularly polarized light, and the circularly polarized light is reflected twice between the second electrode layer 10 and the selective reflection layer 9 and then exits, so that the intensity of the reflected light from the outside is obviously reduced. And the selective reflection layer 9 has a narrow reflection spectrum, and incident light of other wavelength bands penetrates the selective reflection layer 9 and is absorbed by the 1/4 phase delay layer 14 and the linear polarization layer 15, so that the reflectivity of external light can be greatly reduced.
In one possible implementation, the pixel defining layer 7 comprises a black material. The black material has an absorbing effect on light and by providing the pixel defining layer 7 to comprise a black material, reflection at the overlap of the pixel defining layer 7 and the first electrode layer 8 can be reduced.
Preferably, the display panel further includes a planarization layer disposed on a side of the first electrode layer 8 near the array substrate 1, and the planarization layer includes a black gel material. In this way, reflection at the overlap of the planarization layer and the first electrode layer 8 can be reduced.
In one possible embodiment, referring to fig. 9, the present application further provides a method for manufacturing a display panel, where the method includes:
s10: an array substrate 1 is provided.
The array substrate 1 includes a back plate and a bonding electrode located at one side of the back plate, the back plate may include a plurality of metal wires and/or a plurality of driving units for transmitting signals or electric energy, the metal wires and/or the driving units are electrically connected with the bonding electrode, the bonding electrode is electrically connected with a light emitting device, and the metal wires and the driving units may be used for driving the light emitting device.
Preferably, before step S11, the method further comprises: a first electrode layer 8 is formed on one side of the array substrate 1, and the first electrode layer 8 includes a plurality of first electrodes disposed at intervals.
Referring to fig. 10, a first electrode layer 8 is disposed on one side of the array substrate 1, and the first electrode may be an anode, and the anode is electrically connected to a bonding electrode in the array substrate 1 to drive the light emitting layer to emit light.
S11: a pixel defining layer 7 is formed on one side of the array substrate 1, the pixel defining layer 7 including a pixel opening 71 exposing at least a portion of the first electrode.
Referring to fig. 11, a pixel defining layer 7 is formed on one side of the array substrate 1, the pixel defining layer 7 defines a plurality of pixel openings 71, the pixel openings 71 expose at least a portion of the first electrodes, and the light emitting layer 2 is located in the pixel openings 71.
S12: a light emitting layer 2 is formed within the pixel opening 71.
Referring to fig. 12, a light emitting layer 2 is formed in the pixel opening 71.
S13: forming an encapsulation layer 16 on the light-emitting layer 2 and the pixel defining layer 7 at a side far from the array substrate 1; the encapsulation layer 16 includes a recessed region 101 corresponding to the pixel opening 71 and recessed toward the pixel opening 71; the orthographic projection of the concave region 101 on the array substrate covers the orthographic projection of the pixel opening 71 on the array substrate.
Referring to fig. 13, before step S13, a second electrode layer 10 is formed on a side of the light emitting layer 2 and the pixel defining layer 7 away from the array substrate 1, and the second electrode layer 10 may include a cathode. The encapsulation layer 16 is disposed on a side of the second electrode layer 10 away from the array substrate 1, and the recess region 101 is located directly above the pixel opening 71.
S14: forming a selectively reflective layer 9 in the recessed region 101; the orthographic projection of the selective reflection layer 9 on the array substrate is at least partially overlapped with the orthographic projection of the light-emitting layer 2 on the array substrate.
A selectively reflective layer 9 is formed in the recessed region 101 to form a display panel as shown in fig. 2. The selectively reflective layer 9 is located within the recessed region 101; the front projection of the selective reflection layer 9 on the array substrate and the front projection of the light-emitting layer 2 on the array substrate are at least partially overlapped, the selective reflection layer 9 can selectively reflect some light emitted by the light-emitting layer 2 to the second electrode layer 10, and the direction of rotation of the light is changed after the light is secondarily reflected by the second electrode layer 10, so that the light with changed direction of rotation finally passes through the selective reflection layer 9, and the transmittance of the light emitted by the light-emitting layer 2 of the display panel can be increased.
In summary, by providing the selectively reflective layer 9 in the recess region 101 corresponding to the pixel opening 71, which is closer to the light emitting layer 2, the transmittance of the light emitted from the light emitting layer 2 can be improved, so that the light extraction efficiency of the display panel can be improved, and the power consumption of the display panel can be reduced.
In one possible embodiment, the present application also provides an electronic device including the display panel described herein. The electronic device may include a device having image processing capabilities, such as a server, personal computer, notebook computer, or the like. The electronic equipment comprises the display panel, so that the light-emitting rate of the electronic equipment is higher, and the phenomenon that the brightness attenuation of the screen body is accelerated can be improved.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (11)
1. A display panel, the display panel comprising:
an array substrate;
the pixel defining layer is positioned on one side of the array substrate and comprises a plurality of pixel openings;
a light emitting layer located within the pixel opening;
the packaging layer is positioned on one side of the light-emitting layer far away from the array substrate, and comprises a concave area which corresponds to the pixel opening and is concave towards one side of the pixel opening, and the orthographic projection of the concave area on the array substrate covers the orthographic projection of the pixel opening on the array substrate;
and the selective reflection layer is positioned in the concave area, and the orthographic projection of the selective reflection layer on the array substrate is at least partially overlapped with the orthographic projection of the luminous layer on the array substrate.
2. The display panel of claim 1, wherein the orthographic projection of the light emitting layer on the array substrate is within the orthographic projection of the selectively reflective layer on the array substrate.
3. The display panel of claim 1, wherein the encapsulation layer further comprises a barrier layer on a side of the pixel defining layer away from the array substrate, the barrier layer being disposed adjacent to the pixel opening, the barrier layer being at a bottom wall of the pixel opening at a same thickness as a thickness on the pixel defining layer, the selectively reflective layer being on a side of the barrier layer away from the array substrate;
the barrier layer forms the recessed region at the pixel opening.
4. A display panel according to claim 3, wherein the orthographic projection of the side of the selectively reflective layer remote from the array substrate onto the array substrate covers the orthographic projection of the side of the recessed region remote from the array substrate onto the array substrate;
the distance between the bottom surface of the concave region and the array substrate is greater than the distance between the bottom surface of the pixel defining layer and the array substrate, and is smaller than the distance between the top surface of the pixel defining layer and the array substrate.
5. The display panel of claim 1, further comprising:
the pixel defining layer is positioned on one side of the first electrode layer far away from the array substrate, and the pixel opening exposes the first electrode;
a second electrode layer covering the light emitting layer and the pixel defining layer at a side far away from the array substrate, wherein the height of the second electrode layer in the pixel opening is lower than that of the pixel defining layer;
the packaging layer is arranged on one side of the second electrode layer far away from the array substrate.
6. The display panel of claim 3, wherein the barrier layer is a first inorganic layer, and the encapsulation layer further comprises an organic layer on a side of the first inorganic layer away from the array substrate and covering the selectively reflective layer, and a second inorganic layer on a side of the organic layer away from the array substrate.
7. The display panel of claim 1, further comprising a 1/4 phase retardation layer on a side of the encapsulation layer away from the array substrate and a linear polarization layer on a side of the 1/4 phase retardation layer away from the array substrate; the selective reflection layer is used for reflecting one of right-handed polarized light and left-handed polarized light and transmitting the other.
8. The display panel of claim 1, wherein the selective reflective layer comprises a plurality of reflective portions disposed at intervals, the plurality of reflective portions disposed in correspondence with the pixel openings, and wherein an orthographic projection of the reflective portions on the array substrate coincides with an orthographic projection of the pixel openings on the substrate.
9. The display panel of claim 5, wherein the selectively reflective layer comprises cholesteric liquid crystals.
10. A method for manufacturing a display panel, the method comprising:
providing an array substrate;
forming a pixel defining layer on one side of the array substrate, the pixel defining layer including a plurality of pixel openings;
forming a light emitting layer within the pixel opening;
forming a packaging layer on one side of the light-emitting layer and the pixel defining layer, which is far away from the array substrate, wherein the packaging layer comprises a concave area which corresponds to the pixel opening and is concave towards one side of the pixel opening, and the orthographic projection of the concave area on the array substrate covers the orthographic projection of the pixel opening on the array substrate;
forming a selective reflection layer in the concave region; the orthographic projection of the selective reflecting layer on the array substrate is at least partially overlapped with the orthographic projection of the luminous layer on the array substrate.
11. An electronic device, characterized in that the electronic device comprises the display panel of any one of claims 1-9.
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