CN114695798A

CN114695798A - Display panel and display device

Info

Publication number: CN114695798A
Application number: CN202210343648.3A
Authority: CN
Inventors: 张晓晋; 孙海雁; 王斯琦
Original assignee: BOE Technology Group Co Ltd
Current assignee: BOE Technology Group Co Ltd
Priority date: 2022-03-31
Filing date: 2022-03-31
Publication date: 2022-07-01

Abstract

The embodiment of the application provides a display panel and display device, this display panel is including range upon range of base plate, thin-film transistor layer and luminescent device layer, and range upon range of optical matching membrane group, chiral circular polarization layer and antireflection layer optical matching membrane group, chiral circular polarization layer can turn into first circular polarized light and second circular polarized light with the light of the optical window of outgoing, first circular polarized light can see through chiral circular polarization layer, and be converted into linear polarized light and outwards emergent by antireflection layer optical matching membrane group, second circular polarized light can become after being reflected by the cathode layer first circular polarized light carries out recycle, can solve the outgoing light loss that prior art exists more, the great problem of display panel consumption.

Description

Display panel and display device

Technical Field

The application relates to the technical field of display panels, in particular to a display panel and a display device.

Background

In the existing display panel, an Organic Light-Emitting Diode (0 LED) is widely used due to its characteristics of self-luminescence and fast response speed, and in the conventional OLED, in order to realize Light extraction, transparent conductive materials with Light transmittance and conductivity, such as ITO (Indium Tin 0 oxide), are mostly used for electrodes, however, since the ITO material is prepared by bombarding the substrate with high energy, the OLED organic material is decomposed and damaged, therefore, in the OLED with the structure of top emission and the like, ITO is not generally adopted as an electrode material, but an ultrathin metal or metal composite electrode and other semitransparent conductive electrodes are selected, but the semitransparent conductive electrodes have stronger reflection to the light of the external environment, so that the reflected light is too strong to interfere the self-luminescence of the display panel in a bright state environment, and the display contrast of the display panel is reduced.

In the prior art, in order to reduce the reflectivity of external ambient light, an anti-reflection layer optical matching module is arranged on the light-emitting side of the OLED, but the anti-reflection layer optical matching module comprises a linear polarizer, so that when the OLED spontaneous light emits to the outside through the anti-reflection layer optical matching module, the anti-reflection layer optical matching module can lose more than 50%, and the brightness of the display panel is reduced; in order to maintain the brightness, the power consumption of the OLED needs to be increased, which results in increased power consumption of the display panel and reduced lifespan of the OLED.

Disclosure of Invention

The application aims at the defects of the prior art and provides a display panel and a display device, and the technical problem that in the prior art, the brightness of the display panel is insufficient or the power consumption is large is solved.

In a first aspect, embodiments of the present application provide a display panel including a substrate, a thin-film transistor layer, and a light-emitting device layer, which are stacked, and an optical matching film group, a chiral circular polarization layer, and an anti-reflection layer, which are stacked;

the light-emitting device layer comprises an anode layer, a light-emitting functional layer and a cathode layer which are stacked;

the chiral circular polarization layer is used for converting light of an optical window emitted by the light-emitting functional layer into first circularly polarized light and second circularly polarized light, transmitting the first circularly polarized light opposite to the first chiral direction of the chiral circular polarization layer, and reflecting the second circularly polarized light in the same direction as the first chiral direction;

the cathode layer is used for converting the second circularly polarized light into first circularly polarized light to pass through the chiral circular polarization layer;

the optical matching module of the anti-reflection layer is used for converting the first circularly polarized light transmitted by the chiral circular polarization layer into linearly polarized light and emitting the linearly polarized light to the outside.

Optionally, the anti-reflection layer optical matching module comprises a polarizer and a quarter-wave plate;

the wave plate is arranged on one side, close to the substrate, of the polaroid and is used for converting the received first circularly polarized light into linearly polarized light in a first direction after phase delay;

the polarizing plate is used for transmitting linearly polarized light in the first direction.

Optionally, the light of the optical window includes at least one of light of a first colorband, light of a second colorband, and light of a third colorband.

Optionally, the chiral circular polarizing layer comprises at least one of the following chiral circular polarizing structures:

the optical filter comprises a chiral circular polarization structure corresponding to first color light of a first waveband, a chiral circular polarization structure corresponding to third color light of a third waveband, a chiral circular polarization structure corresponding to second color light of a second waveband, and a chiral circular polarization structure corresponding to light of a full waveband of visible light.

Optionally, the display panel comprises at least one of:

the transmittance range of the light of the optical window transmitting through the chiral circular polarization layer is 35% -65%;

the transmittance range of light outside the optical window transmitting through the chiral circular polarization layer is 85% -100%.

Optionally, the optical matching film group comprises at least two periodic optical matching layers which are arranged in a stacked manner, wherein each periodic optical matching layer comprises two adjacent optical matching layers with different refractive indexes; the refractive index difference Deltan of two adjacent optical matching layers in at least one period is more than or equal to 0.15.

Optionally, the optical matching film group includes at most five periods of optical matching layers.

Optionally, the optical matching film group further comprises at least one period of refractive index difference Δ n of two adjacent optical matching layers, which is less than 0.15.

Optionally, the light-emitting functional layer includes pixel light-emitting units arranged in an array, and the display panel further includes a light-absorbing layer and a flat layer arranged between the chiral circular polarization layer and the optical matching film group;

the light absorption layer comprises light absorption units distributed in an array, orthographic projections of the light absorption units on the light emitting function layer are positioned between the adjacent pixel light emitting units, and the distance between the boundaries of the orthographic projections and the boundaries of the pixel light emitting units is not more than 0.3 time of the length of the pixel light emitting units.

Optionally, the display panel further comprises at least one of:

the orthographic projection of the light absorption unit on the light-emitting functional layer also covers partial edge areas of the pixel light-emitting units;

the total aperture ratio range of the pixel light-emitting unit comprises 28.5% -50%.

Optionally, the phase retardation of the cathode layer to the reflected light comprises-2/pi.

Optionally, the anode layer is a total reflection anode layer, the cathode layer is a semitransparent cathode layer, and the optical matching film group is located on one side of the semitransparent cathode layer away from the substrate;

the display panel further includes: an optical cover layer disposed between the semitransparent cathode layer and the optical matching film group; and in the optical covering layer, each film layer of the chiral circular polarization layer and the flat layer, the refractive index difference of at least two adjacent layers is more than 0.4.

Optionally, the anode layer is a transparent anode layer, the cathode layer is a total reflection cathode layer, and the optical matching film group is located on one side of the substrate far from the total reflection cathode layer.

In a second aspect, an embodiment of the present application provides a display device, including the display panel provided in the first aspect of the present application.

The beneficial technical effects brought by the technical scheme provided by the embodiment of the application comprise:

the display panel that this application embodiment provided sets up chirality circular polarization layer in display panel, has solved the too much loss of anti-reflection coating to display panel's emergent ray, leads to the problem of display panel power increase. Specifically, the method comprises the following steps:

the side, close to the internal light-emitting, of the optical matching film group of the anti-reflection layer is provided with the chiral circular polarization layer, light of an optical window, emitted by the light-emitting function layer in the light-emitting device layer, is converted into first circularly polarized light and second circularly polarized light in opposite directions by the chiral circular polarization layer, the first circularly polarized light is opposite to the first chiral direction of the chiral circular polarization layer, can completely penetrate through the chiral circular polarization layer, is converted into linearly polarized light capable of penetrating through the anti-reflection layer by the anti-reflection layer and is emitted to the outside, so that the first circularly polarized light converted by the chiral circular polarization layer is received by the anti-reflection layer, the transmittance is higher, the brightness of the display panel can be increased, and the power consumption of the display panel is reduced.

And the second circularly polarized light is the same as the first chiral direction of the chiral circular polarization layer, is reflected by the chiral circular polarization layer, can be partially reflected again at the cathode layer of the light-emitting device layer, and is converted into the first circularly polarized light to penetrate through the chiral circular polarization layer after being reflected in the opposite direction, so that the utilization rate of emergent light of the display panel is increased, the brightness of the display panel is further improved, and the power consumption of the display panel is reduced.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of a display panel according to an embodiment of the present disclosure;

FIG. 2 is a schematic diagram illustrating the effect of an anti-reflection layer optical matching film set on light transmitted through a chiral circular polarization layer according to an embodiment of the present disclosure;

FIG. 3 is a schematic transparent view of an optical matching film assembly including two periodic optical matching layers according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of a display panel including a light absorbing layer according to an embodiment of the present disclosure;

FIG. 5 is a schematic diagram illustrating polarization states of reflected light after different phase delays according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a display panel of a top emission structure according to an embodiment of the present disclosure;

fig. 7 is a schematic structural diagram of a display panel with a bottom emission structure according to an embodiment of the present disclosure.

The reference numerals of the drawings are explained below:

1-a display panel;

101-a substrate; 102-a thin-film-transistor layer;

103-a light emitting device layer; 1031-anode layer; 1032-a light emitting functional layer; 1033-a cathode layer;

104-optical matching film group; 1041 — an optical path matching layer of a first periodic second refractive index; 1042 — an optical path matching layer of a first refractive index of a first period; 1043 — an optical path matching layer of second refractive index of second period; 1044 — an optical path matching layer of first refractive index of second periodicity;

105-a chiral circular polarizing layer;

106-an anti-reflection layer; 1061-a quarter-wave plate; 1062-polarizer;

107-light absorbing layer; 108-a planar layer; 109-an optical cover layer;

201-pixel light emitting unit; 202-pixel definition structure.

Detailed Description

Embodiments of the present application are described below in conjunction with the drawings in the present application. It should be understood that the embodiments set forth below in connection with the drawings are exemplary descriptions for explaining technical solutions of the embodiments of the present application, and do not limit the technical solutions of the embodiments of the present application.

As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of other features, information, data, steps, operations, elements, components, and/or groups thereof, that may be implemented as required by the art. The term "and/or" as used herein refers to at least one of the items defined by the term, e.g., "a and/or B" may be implemented as "a", or as "B", or as "a and B".

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

The embodiment of the application provides a display panel 1, as shown in fig. 1, including a stacked substrate 101, a thin-film transistor layer 102, and a light-emitting device layer 103, and a stacked optical matching film group, a chiral circular polarization layer 105, and an anti-reflection layer 106.

The light emitting device layer 103 includes an anode layer 1031, a light emitting functional layer 1032, and a cathode layer 1033, which are stacked.

The chiral circular polarization layer 105 is used to convert light of the optical window emitted from the light emitting functional layer 1032 into first circularly polarized light and second circularly polarized light, transmit the first circularly polarized light in the opposite direction to the first chiral direction of the chiral circular polarization layer 105, and reflect the second circularly polarized light in the same direction as the first chiral direction.

The cathode layer 1031 is used to convert the second circularly polarized light into the first circularly polarized light to pass through the chiral circular polarization layer 105.

The anti-reflection layer 106 is used for converting the first circularly polarized light transmitted by the chiral circular polarization layer 105 into linearly polarized light and emitting the linearly polarized light to the outside.

According to the display panel 1 provided by the embodiment of the application, the chiral circular polarization layer 105 is arranged in the display panel 1, so that the problem that the power of the display panel 1 is increased due to excessive loss of the emergent light of the anti-reflection layer 106 to the display panel 1 is solved. Specifically, the method comprises the following steps:

the chiral circular polarization layer 105 is arranged on the side of the anti-reflection layer 106 close to the internal light emitting side, light of an optical window emitted by the light emitting function layer 1032 in the light emitting device layer 103 is converted into first circularly polarized light and second circularly polarized light in opposite directions by the chiral circular polarization layer 105, the first circularly polarized light is opposite to the first chiral direction of the chiral circular polarization layer 105, can completely pass through the chiral circular polarization layer 105, is converted into linearly polarized light capable of transmitting the anti-reflection layer 106 by the anti-reflection layer 106, and is emitted to the outside, so that the anti-reflection layer 106 receives the first circularly polarized light converted by the chiral circular polarization layer 105, has higher transmittance, can increase the brightness of the display panel 1, and reduces the power consumption of the display panel.

Moreover, the second circularly polarized light has the same direction as the first chiral direction of the chiral circularly polarized layer 105, is reflected by the chiral circularly polarized layer 105, can be partially re-reflected at the cathode layer 1033 of the light emitting device layer 103, and is converted into the first circularly polarized light to transmit through the chiral circularly polarized layer 105, so that the utilization rate of the emergent light of the display panel 1 is increased, the brightness of the display panel 1 is further improved, and the power consumption of the display panel 1 is reduced.

Alternatively, the display panel 1 includes an OLED (Organic Light-Emitting Diode).

Alternatively, the thin film transistor is a TFT (thin film transistor).

Alternatively, the Chiral circular polarizing layer 105 includes CLC (Chiral liquid crystal).

Optionally, the refractive index N of the chiral circular polarization layer 105, the chiral structure pitch P, and the photoluminescence spectrum full width at half maximum FWHM of the guest of the light-emitting layer satisfy: | Ne-No |. xP ≧ FWHM × 2. Wherein No and Ne are refractive indexes of the CLC material in the directions parallel to the optical axis and vertical to the optical axis respectively, and P is the intrinsic property of the CLC material.

Optionally, the chiral circular polarizing layer 105 further satisfies the following relationship with the guest emission spectrum peak λ of the light-emitting layer: and | the (No + Ne) × P-2 λ | is less than or equal to 3 × FWHM.

Alternatively, the light emitting functional layer 1032 may emit light including optical windows and light of non-optical windows. The light of the optical window includes light of a specific wavelength band.

Alternatively, when the cathode layer 1033 is a transparent electrode, the second circularly polarized light is entirely transmitted; when the cathode layer 1033 is a translucent electrode, the second circularly polarized light is partially transmitted and partially reflected; when the cathode layer 1033 is a total reflection electrode, the second circularly polarized light is totally reflected.

Optionally, the chiral circular polarization layer 105 is configured to convert light of the optical window exiting the light emitting functional layer 1032 into first circularly polarized light and second circularly polarized light, including 50% of the first circularly polarized light and 50% of the second circularly polarized light.

In some embodiments, the anti-reflection layer 106 includes a polarizer 1062 and a quarter-wave plate 1061.

As shown in fig. 2, a wave plate 1061 is disposed on a side of the polarizer 1062 close to the substrate 101, and is used for converting the received first circularly polarized light into linearly polarized light in the first direction after performing phase retardation.

The polarizing plate 1062 is for transmitting linearly polarized light in the first direction.

Optionally, the first circularly polarized light is transmitted through the chiral circular polarization layer 105 and then exits to the wave plate 1061, so as to generate a phase retardation, and the linearly polarized light in the first direction is transmitted through the wave plate 1061.

Alternatively, the polarizing plate 1062 includes a linearly polarizing plate 1062 having a transmission direction set to a first direction, and linearly polarized light of the first direction can be transmitted through the polarizing plate 1062 without loss.

In addition, in the related art, the polarizer 1062 may consume at least 50% of the light emitted from the light emitting device layer of the display panel received by the anti-reflection layer 106, and thus the brightness of the display panel may be reduced by about 43%. In contrast, in the embodiment of the present invention, the transmittance of the outgoing light converted by the chiral circular polarization layer 105 through the anti-reflection layer 106 is greatly improved, so that the brightness of the display panel 1 of the embodiment of the present invention can be improved by about 28%.

In some embodiments, the light of the optical window includes at least one of light of a first colorband, light of a second colorband, and light of a third colorband.

Optionally, the light of the optical window is light of a specific wavelength band, and the light includes a first color, a second color and a third color according to different wavelength bands.

Optionally, the light of the optical window comprises red light with a wavelength band of 622nm (nanometer) to 760nm, green light with a wavelength band of 492nm to 577nm, and blue light with a wavelength band of 435nm to 450 nm.

In some embodiments, the chiral circular polarizing layer 105 comprises at least one chiral circular polarizing structure described below.

Optionally, the light of the first colorband, the light of the second colorband, and the light of the third colorband include red light, green light, and blue light, and the chiral circular polarization structure includes a chiral circular polarization structure corresponding to the red light, a chiral circular polarization structure corresponding to the green light, and a chiral circular polarization structure corresponding to the blue light.

Optionally, the transmittance of the red light emitted from the display panel 1 in the anti-reflection layer optical matching film group can be improved by the chiral circular polarization structure corresponding to the red light, and the transmittance of the green light and the transmittance of the blue light emitted from the display panel 1 in the anti-reflection layer optical matching film group can be respectively improved by the chiral circular polarization structure corresponding to the green light and the blue light, so that the power consumption of the display panel 1 is reduced.

Optionally, when the chiral circular polarization structure corresponding to red light is used alone, the power consumption of the display panel 1 can be reduced by 6% compared with the case of not using any chiral circular polarization structure; when the chiral circular polarization structure corresponding to the green light is used independently, the power consumption of the display panel 1 can be reduced by 8% compared with the case of not using any chiral circular polarization structure; when the chiral circular polarization structure corresponding to blue light is used alone, the power consumption of the display panel 1 can be reduced by 8% relative to when no chiral circular polarization structure is used.

Optionally, the chiral circular polarization structures of the green light and the blue light corresponding to the red light may be stacked, so that the transmittances of the red light, the green light, and the blue light emitted from the display panel 1 in the anti-reflection layer optical matching film group are all improved, and the power consumption of the display panel 1 is further reduced.

Optionally, for the outgoing light of the display panel 1 in the full band, that is, when the white light is emitted, the chiral circular polarization structure of the light in the full band may be further set, so that the transmittance of the light in the full band emitted by the display panel 1 in the anti-reflection layer optical matching film group is improved, and the power consumption of the display panel 1 is reduced by 20% compared with the case of not using any chiral circular polarization structure.

In some embodiments, the display panel 1 comprises at least one of the following.

The optical window has a transmittance of light through the chiral circular polarizing layer 105 in the range of 35% to 65%, including 35% or 65%.

The transmittance of light outside the optical window through the chiral circular polarizing layer 105 ranges from 85% to 100%, including 85% or 100%.

Optionally, light of the optical window passes through the chiral circular polarization layer 105, 50% of the light is converted into first circularly polarized light, and 50% of the light is converted into second circularly polarized light, and due to the preparation process and the structure of the chiral circular polarization layer 105, a part of the first circularly polarized light is absorbed or scattered and does not pass through the chiral circular polarization layer 105; there is also a portion of the second circularly polarized light that is not reflected, but the leak light passes through the chiral circularly polarizing layer 105, so the transmittance through the chiral circularly polarizing layer 105 is 50% ± 15%.

Optionally, the chiral circular polarizing layer 105 has no converting effect on light outside the optical window, and the transmittance of light outside the optical window through the chiral circular polarizing layer 105 ranges from 85% to 100% considering that part of light is absorbed or scattered and lost.

In some embodiments, the optical matching film group comprises at least two periodic optical matching layers arranged in a stacked manner, wherein each periodic optical matching layer comprises two adjacent optical matching layers with different refractive indexes; the refractive index difference Deltan of two adjacent optical matching layers in at least one period is more than or equal to 0.15.

Alternatively, the difference in refractive index is the difference in refractive index between the higher index optical matching layer and the lower index optical matching layer, which is the high refractive index minus the low refractive index.

Optionally, the optical matching layer with high and low refractive index changes periodically, which is beneficial to the coupling and outputting of the emergent light of the display panel 1.

Optionally, the larger the refractive index difference between the optical matching layers with high and low refractive index is, the more favorable the emission rate of the display panel 1 is, including the refractive index difference Δ n ≧ 0.15.

Alternatively, when the optical matching film group includes two periods of optical matching layers arranged in a stack, as shown in fig. 3, the arrangement of the optical matching layers includes:

a first period: the second refractive index optical matching layer 1041 may be a low refractive index transparent film layer formed by thermal evaporation, or by forming SiO2 (silicon dioxide) by PECVD (Plasma Enhanced Chemical Vapor Deposition), and the like, and has a thickness of 40nm to 100nm, which may be 40nm or 100 nm; the first refractive index optical matching layer 1042 may be formed by PECVD of SiN (silicon nitride) or SiON (silicon oxynitride) of transparent film with a thickness of 500 nm-2000 nm, or 500nm or 2000 nm.

Second period: the optical matching layer 1043 with the second refractive index may be formed by forming a resin material by inkjet printing, curing the resin material by light, heat, or the like to form a transparent layer, or by depositing a low refractive index inorganic material such as SiO2 by PECVD, and may have a thickness of 5000nm to 20000nm, or 5000nm or 20000 nm; the optical matching layer 1044 with the first refractive index can be PECVD formed SiN or SiON formed transparent layer with a thickness of 400 nm-1000 nm, and can be 400nm or 1000 nm.

Optionally, the thickness of the two-period optical matching layer further comprises:

a first period: the thickness of the optical matching layer 1041 with the second refractive index is 50nm to 70nm, and can be 50nm or 70 nm; the optical matching layer 1042 of the first refractive index has a thickness of 800nm to 1200nm, which may be 800nm or 1200 nm.

Second period: the thickness of the optical matching layer 1043 with the second refractive index is 8000 nm-12000 nm, and may be 8000nm or 12000 nm; the optical matching layer 1044 of the first refractive index has a thickness of 500nm to 700nm, which may be 500nm or 700 nm.

Optionally, the other periodic optical matching layers are referenced to the second periodic optical matching layer.

In some embodiments, the set of optical matching films includes at most five periods of optical matching layers.

Optionally, in order to ensure that the manufacturing process of the display panel 1 and the thickness of the display panel 1 meet the requirements, the optical matching film set includes at most five periods of optical matching layers.

In some embodiments, the optical matching film group further comprises at least one period of refractive index difference Δ n between two adjacent optical matching layers < 0.15.

Alternatively, the reflection light of the dielectric layer may be reduced by reducing the reflectance of the interface of the film medium under the chiral circular polarization layer 105, the film medium under the chiral circular polarization layer 105 including the optical matching film group.

Alternatively, in adjacent optical matching layers, the third refractive index is represented by n1, the fourth refractive index is represented by n2, and n1 > n 2.Δ n ═ n1-n2| according to the following reflectance R expression (1):

when Δ n ═ n1-n2| < <2n2, Δ n represents the refractive index difference of the adjacent optical matching layers.

The reflectance expression can be expressed as the following expression (2):

therefore, in order to reduce the reflectivity of the external light, the fourth refractive index n2 can be increased, or the refractive index difference between the adjacent optical matching layers can be reduced, including the refractive index difference Δ n < 0.15 between the high refractive index and the low refractive index of the two adjacent layers.

Optionally, a lower index optical matching layer is disposed on the side near the chiral circular polarizing layer 105.

Alternatively, as shown in the following table, when the fourth refractive index is constant, the refractive index difference of the adjacent optical matching layers is reduced by reducing the third refractive index, and the reflectance for light of different wavelengths is significantly reduced.

The following table 1 is used as an example to describe the reflectivity of different wavelengths of light at different first refractive indexes

	Third refractive index	Fourth refractive index	480nm	530nm	620nm
						Comparative example	1.84	1.48	17.5％	19.0％	17.7％
Examples	1.57	1.48	16.7％	17.9％	16.5％

TABLE 1

Optionally, in combination with the above embodiment, in order to increase the output rate of the display panel 1, the refractive index difference Δ n between two adjacent high and low refractive layers in at least one period is greater than or equal to 0.15, and in this embodiment, the refractive index difference Δ n between two adjacent high and low refractive layers in at least one period is less than 0.15, the optical matching film group at least includes two periodic optical matching layers, and the optical matching layer with the refractive index difference Δ n between two adjacent high and low refractive layers greater than or equal to 0.15 is disposed on a side close to the substrate 101, and is used to increase the output rate of the output light of the display panel 1; two adjacent optical matching layers with the refractive index difference deltan of the high and low refractive layers less than 0.15 are arranged on one side close to the chiral circular polarization layer 105 and used for reducing the reflectivity of external light in the display panel 1.

In some embodiments, as shown in fig. 4, the light emitting function layer 1032 includes pixel light emitting units 201 arranged in an array, and the display panel 1 further includes a light absorbing layer 107 and a planarization layer 108 arranged between the chiral circular polarization layer 105 and the optical matching film group.

The light absorbing layer 107 includes light absorbing units distributed in an array, the orthographic projection of the light absorbing units on the light emitting function layer 1032 is located between the adjacent pixel light emitting units 201, and the distance between the boundary of the orthographic projection and the boundary of the pixel light emitting unit 201 is not more than 0.3 times the length of the pixel light emitting unit 201.

Optionally, as shown in fig. 4, the display panel 1 further includes a pixel defining structure 202, which is located between adjacent pixel light emitting units 201 and is used for avoiding color mixing between pixels of different colors.

Optionally, to further reduce the reflectivity of the external light in the display panel 1, a light absorbing layer 107 is provided in the display panel 1.

Alternatively, the light absorbing layer 107 includes light absorbing units made of BM (Black Matrix), the light absorbing units and the pixel defining structure 202 are in the same vertical direction, and the boundary projected on the light emitting function layer 1032 is ± 0.3 times the length of the pixel light emitting unit 201 from the boundary of the pixel light emitting unit 201.

Alternatively, as will be understood by those skilled in the art, the light absorbing unit is disposed to absorb more external light as possible while avoiding affecting the light emitted from the pixel light emitting unit 201.

Optionally, the light absorbing layer 107 has an absorbance of 80% or more for light in the 380nm to 780nm band, including 380nm or 780nm band.

Alternatively, the planarization layer 108 can be formed by spin coating or pulling, including covering the light absorbing layer 107 with a layer of photoresist and curing.

Optionally, the planarization layer 108 is close to the chiral circular polarization layer 105, and in order to reduce the reflectivity of the external light, the difference between the refractive index of the planarization layer 108 and the refractive index of the optical matching layer with the second refractive index of the chiral circular polarization layer 105 is less than or equal to 0.15.

In some embodiments, the display panel 1 further comprises at least one of:

the orthographic projection of the light absorbing unit on the light emitting functional layer 1032 also covers part of the edge area of the pixel light emitting unit 201;

the total aperture ratio of the pixel light emitting unit 201 ranges from 28.5% to 50%.

Alternatively, in the display panel 1 applied to the field of peeping prevention and the like, the light absorption unit is disposed in association with the peeping prevention technology, including covering a part of the pixel light emitting unit 201, and the total aperture ratio of the pixel light emitting unit 201 includes 28.5% to 50%, which may be 28.5% or 50%.

In some embodiments, the phase retardation of the reflected light by the cathode layer 1033 comprises-2/π -2/π.

Alternatively, as shown in fig. 5, the cathode layer 1033 may impart a phase retardation of 0 to pi or (-pi to 0) to the reflected light, as shown, including a phase difference Δ Φ to-pi; delta phi belongs to III, namely delta phi belongs to-pi to-2/pi; Δ Φ -2/pi; delta phi belongs to IV, namely delta phi belongs to-2/pi-0; Δ Φ is 0; delta phi belongs to I, namely delta phi belongs to 0-2/pi; Δ Φ -2/π; and delta phi epsilon II, namely delta phi epsilon 2/pi-pi.

The phase delay enables the polarization state of the circularly polarized light to change after reflection, and when the phase difference delta phi generated by reflection is 0-2/pi (-2/pi-0), namely delta phi belongs to I or delta phi belongs to IV, the reflected light is converted into elliptically polarized light with lower components capable of passing through the chiral circular polarization layer 105; when the reflection phase difference delta phi is-2/pi or 2/pi, the reflected light becomes a linear polarization state; when the reflection phase difference delta phi is-pi to-2/pi or 2/pi to pi, namely delta phi epsilon III or delta phi epsilon II, the reflected light is elliptically polarized light with higher components capable of passing through the chiral circular polarization layer 105, and when the reflection phase difference delta phi is pi or-pi, the reflected light is circularly polarized light capable of converting the rotation direction and can completely pass through the chiral circular polarization layer 105.

Optionally, in order to reduce the transmittance of the chiral circular polarization layer 105 to the reflected light, i.e., reduce the reflectivity of the display panel 1, the phase retardation of the cathode layer 1033 to the reflected light is set to be 0-2/pi.

Optionally, when the phase retardation of the cathode layer 1033 on the reflected light is 0 to 2/pi, the refractive index n and the extinction coefficient k of the cathode layer 1033 and the refractive index n1 of the film layer adjacent to the cathode layer 1033 and close to the chiral circular polarization layer 105 satisfy the following expression (3):

alternatively, when the extinction coefficient k of the cathode layer 1033 is large, including exceeding the refractive index n1, the following expression (4) is satisfied:

optionally, the refractive index n and the extinction coefficient k are a refractive index n and an extinction coefficient k when the corresponding optical window corresponds to the center wavelength at the wavelength, and when the corresponding optical window corresponds to white light in the full-band, the refractive index n and the extinction coefficient k when the wavelength is 550 nm.

In some embodiments, as shown in fig. 6, the anode layer 1031 is a total reflection anode layer, the cathode layer 1033 is a semitransparent cathode layer, and the optical matching film group is located on a side of the semitransparent cathode layer away from the substrate 101.

The display panel 1 further includes: an optical cover layer 109 disposed between the semitransparent cathode layer and the optical matching film group; at least two adjacent layers of the optical cover layer 109, the chiral circular polarizing layer 105, and the flattening layer 108 have a refractive index difference of more than 0.4.

Alternatively, when the display panel 1 is in a top-emitting configuration, the cathode layer 1033 is in a semi-transparent configuration, and the recycling of the second circularly polarized light, including reflection on the semi-transparent cathode layer, is at most 50% reflective.

Alternatively, the light emitting function layer 1032 of the top emission structure of the display panel 1 includes an electron transport layer, a light emitting layer, a hole transport layer, and a hole injection layer, which are stacked, the electron transport layer is located at a side close to the semitransparent cathode layer, and the hole injection layer is located at a side close to the total reflection anode layer.

Optionally, the optical cover layer 109 comprises a high refractive index organic or inorganic layer, the refractive index of which comprises more than 1.7.

Optionally, the difference between the refractive indices of the two adjacent layers being greater than 0.4 includes the difference between the refractive index of the optical cover layer 109 and the refractive index of the layer of the chiral circular polarizing layer 105 adjacent to the optical cover layer 109 being greater than 0.4.

Alternatively, as shown in fig. 7, the anode layer 1031 is a transparent anode layer, the cathode layer 1033 is a total reflection cathode layer, and the optical matching film group is located on a side of the substrate 101 away from the total reflection cathode layer.

Alternatively, when the display panel 1 is a bottom emission structure, the cathode layer 1033 is a total reflection cathode layer, and the second circularly polarized light can be reflected and recycled more.

Optionally, in the bottom emission structure of the display panel 1, filters 1061 with different colors are disposed between the chiral circular polarization layer 105 and the anti-reflection layer optical matching film set, so as to implement output of color pictures.

Alternatively, the light emitting function layer 1032 of the bottom emission structure of the display panel 1 includes an electron injection layer, an electron transport layer, a light emitting layer, a hole transport layer, and a hole injection layer, which are stacked, the electron injection layer is located at a side close to the total reflection cathode layer, and the hole injection layer is located at a side close to the transparent anode layer.

Based on the same inventive concept, the embodiment of the present application provides a display device, which includes the display panel 1 provided by the present application.

According to the display panel 1 provided by the embodiment of the application, the chiral circular polarization layer 105 is arranged in the display panel 1, so that the problem that the power of the display panel is increased due to excessive loss of the emergent light of the display panel by the anti-reflection layer 106 is solved. Specifically, the method comprises the following steps:

the chiral circular polarization layer 105 is arranged on the side of the anti-reflection layer 106 close to the internal light emitting side, light of an optical window emitted by the light emitting function layer 1032 in the light emitting device layer 103 is converted into first circularly polarized light and second circularly polarized light in opposite directions by the chiral circular polarization layer 105, the first circularly polarized light is opposite to the first chiral direction of the chiral circular polarization layer 105, can completely pass through the chiral circular polarization layer 105, is converted into linearly polarized light which can be transmitted by the anti-reflection layer 106 through the anti-reflection layer 106 by the anti-reflection layer 106, and is emitted to the outside, so that the anti-reflection layer 106 receives the first circularly polarized light converted by the chiral circular polarization layer 105, has higher transmittance, can increase the brightness of the display panel 1, and reduces the power consumption of the display panel.

Moreover, the second circularly polarized light is the same as the first chiral direction of the chiral circular polarization layer 105, is reflected by the chiral circular polarization layer 105, can be partially re-reflected at the cathode layer 1033 of the light emitting device layer 103, and the reflected chiral direction is opposite to the first circularly polarized light, so that the first circularly polarized light is converted to be transmitted through the chiral circular polarization layer 105, the utilization rate of the emergent light of the display panel 1 is increased, the brightness of the display panel 1 is further improved, and the power consumption of the display panel 1 is reduced.

Those of skill in the art will appreciate that the various operations, methods, steps in the processes, acts, or solutions discussed in this application can be interchanged, modified, combined, or eliminated. Further, other steps, measures, or schemes in various operations, methods, or flows that have been discussed in this application can be alternated, altered, rearranged, broken down, combined, or deleted. Further, the steps, measures, and schemes in the various operations, methods, and flows disclosed in the present application in the prior art can also be alternated, modified, rearranged, decomposed, combined, or deleted.

In the description of the present application, the directions or positional relationships indicated by the words "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like are for convenience of description or simplicity of describing the embodiments of the present application based on the exemplary directions or positional relationships shown in the drawings, and do not indicate or imply that the devices or components referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present application.

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, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.

In the description of the present application, it is to 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; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in this application will be understood to be a specific case for those of ordinary skill in the art.

In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

It should be understood that, although the steps in the flowcharts of the figures are shown in sequence as indicated by the arrows, the order in which the steps are performed is not limited to the sequence indicated by the arrows. In some implementations of the embodiments of the present application, the steps in the various flows may be performed in other sequences as desired, unless explicitly stated otherwise herein. Moreover, some or all of the steps in each flowchart may include multiple sub-steps or multiple stages, depending on the actual implementation scenario. Some or all of the sub-steps or phases may be executed at the same time, or may be executed at different times in a scenario where the execution time is different, and the execution order of the sub-steps or phases may be flexibly configured according to the requirement, which is not limited in this embodiment of the application.

The foregoing is only a part of the embodiments of the present application, and it should be noted that, for those skilled in the art, other similar implementation means based on the technical idea of the present application may be adopted without departing from the technical idea of the present application, and the scope of protection of the embodiments of the present application also belongs to the embodiments of the present application.

Claims

1. The display panel is characterized by comprising a substrate, a thin film transistor layer, a light-emitting device layer, an optical matching film group, a chiral circular polarization layer and an anti-reflection layer which are laminated;

2. The display panel of claim 1, wherein the anti-reflective layer optical matching module comprises a polarizer and a quarter-wave plate;

the polaroid is used for transmitting linearly polarized light in the first direction.

3. The display panel of claim 1, wherein the light of the optical window comprises at least one of light of a first colorband, light of a second colorband, and light of a third colorband.

4. The display panel of claim 3, wherein the chiral circular polarizing layer comprises at least one of the following chiral circular polarizing structures:

5. The display panel of claim 4, comprising at least one of:

6. The display panel according to any one of claims 1 to 5, wherein the optical matching film group includes at least two periodic optical matching layers disposed in a stack, each periodic optical matching layer including two adjacent optical matching layers of different refractive indices; the refractive index difference Deltan of two adjacent optical matching layers in at least one period is more than or equal to 0.15.

7. The display panel according to claim 6, wherein the optical matching film group includes at most five periods of optical matching layers.

8. The display panel according to claim 7, wherein the optical matching film group further comprises that the refractive index difference Δ n of two adjacent optical matching layers of at least one period is less than 0.15.

9. The display panel according to any one of claims 1 to 7, wherein the light emission functional layer comprises pixel light emission units arranged in an array, and the display panel further comprises a light absorbing layer and a planarization layer arranged between the chiral circular polarizing layer and the optical matching film group;

the light absorption layer comprises light absorption units distributed in an array, orthographic projections of the light absorption units on the light emitting function layer are located between the adjacent pixel light emitting units, and the distance between the boundaries of the orthographic projections and the boundaries of the pixel light emitting units is not more than 0.3 time of the length of the pixel light emitting units.

10. The display panel of claim 9, further comprising at least one of:

the total aperture ratio of the pixel light-emitting unit ranges from 28.5% to 50%.

11. The display panel of claim 1, wherein the phase retardation of the reflected light by the cathode layer comprises-2/pi.

12. The display panel of claim 1,

the anode layer is a total reflection anode layer, the cathode layer is a semitransparent cathode layer, and the optical matching film group is positioned on one side of the semitransparent cathode layer, which is far away from the substrate;

13. The display panel of claim 1, wherein the anode layer is a transparent anode layer, the cathode layer is a total reflection cathode layer, and the optical matching film group is located on a side of the substrate away from the total reflection cathode layer.

14. A display device comprising the display panel according to any one of claims 1 to 13.