CN114430015A

CN114430015A - Display panel and display device

Info

Publication number: CN114430015A
Application number: CN202210109113.XA
Authority: CN
Inventors: 李若湘; 陈前; 夏亮; 胡耀; 邬奇洋; 王旭聪; 张芳
Original assignee: BOE Technology Group Co Ltd; Chengdu BOE Optoelectronics Technology Co Ltd
Current assignee: BOE Technology Group Co Ltd; Chengdu BOE Optoelectronics Technology Co Ltd
Priority date: 2022-01-28
Filing date: 2022-01-28
Publication date: 2022-05-03

Abstract

The embodiment of the invention discloses a display panel and a display device. In one embodiment, the display panel comprises a substrate, and a light emitting layer, an 1/4 lambda phase difference film, a transflective film and a polarizing layer which are laminated on the substrate; the semi-transparent semi-reflective film is a polarization beam splitting type semi-transparent semi-reflective film. The implementation mode can improve the light transmittance of the display panel, improve the display effect and reduce the power consumption of the display panel.

Description

Display panel and display device

Technical Field

The invention relates to the technical field of display. And more particularly, to a display panel and a display device.

Background

At present, display panels have become indispensable components of electronic devices such as mobile phones and computers. In order to avoid reflection of the display panel from outside light, visibility is low. Therefore, generally, 1/4 λ retardation film and a polarizing layer are sequentially disposed on the light-emitting side of the display panel, at this time, natural light (i.e. unpolarized light) emitted from the display panel still becomes natural light after passing through the 1/4 λ retardation film, after the natural light passes through the polarizing layer, light with a vibration direction parallel to the transmission axis of the polarizing layer is transmitted, light with a vibration direction parallel to the absorption axis of the polarizing layer is absorbed by the polarizing layer, and the transmittance of light emitted from the display panel cannot exceed 50%, resulting in low light-emitting efficiency of the display panel.

Disclosure of Invention

The present invention is directed to a display panel and a display device to solve at least one of the problems of the prior art.

In order to achieve the purpose, the invention adopts the following technical scheme:

the invention provides a display panel, which comprises a substrate, a luminescent layer, an 1/4 lambda phase difference film, a semi-transparent and semi-reflective film and a polarizing layer, wherein the luminescent layer, the 1/4 lambda phase difference film, the semi-transparent and semi-reflective film and the polarizing layer are arranged on the substrate in a laminated manner; the semi-transparent and semi-reflective film is a polarization beam splitting type semi-transparent and semi-reflective film.

According to the display panel provided by the first aspect of the invention, the polarization beam splitting type semi-transparent and semi-reflective film used for transmitting the linearly polarized light with the first vibration direction and reflecting the linearly polarized light with the second vibration direction is additionally arranged between the 1/4 lambda phase difference film and the polarization layer, and the polarization layer transmitting the linearly polarized light with the first direction is matched, so that the light transmittance of the display panel can be improved, the display effect is improved, and the power consumption of the display panel is reduced.

Optionally, the display panel further includes a black matrix layer disposed on a side of the light emitting layer away from the substrate, the light emitting layer includes light emitting units arranged in an array, the black matrix layer is provided with first openings arranged in an array, and a projection of each of the first openings on the substrate covers a projection of one of the light emitting units on the substrate.

This optional mode, through increase the black matrix layer that is used for the extinction in display panel, can absorb the external environment light of inciding to display panel, reduce display panel to the reflection of ambient light to when increasing the light-emitting efficiency of semi-transparent semi-reflective membrane in order to promote display panel, the compensation increases the semi-transparent semi-reflective membrane and reflects the negative effect of bringing the certain degree to the ambient light.

Optionally, the area of the projection of the first opening on the substrate is larger than the area of the projection of the light emitting unit on the substrate.

The optional mode can ensure that the black matrix layer does not influence the light emitting of each light emitting unit, and ensure the light emitting efficiency of the display panel.

Alternatively, the black matrix layer is located between the 1/4 λ retardation film and the light-emitting layer.

This alternative may make the design process of the black matrix layer easier to implement.

Optionally, the light emitting unit includes a first color light emitting unit, a second color light emitting unit, and a third color light emitting unit, the transflective film is transflective to the first color light and is transmissive to other colors except the first color light, the display panel further includes a color resist layer disposed on one side of the substrate away from the light emitting layer, the color resist layer is configured to absorb the first color light, the color resist layer is provided with second openings arranged in an array, and a projection of each of the second openings on the substrate covers a projection of the first color light emitting unit on the substrate.

This optional mode, through increasing to the semi-transparent semi-reflective membrane of first colour light and to other colour light transmission except that first colour light, combine to offer the second open-ended that corresponds first colour luminescence unit and be used for absorbing the color resist layer of first colour light, can increase the semi-transparent semi-reflective membrane in the compensation and reflect the negative effects of the certain degree that brings to the ambient light reflection, promote the whole luminous efficiency of display panel through the luminous efficiency of the first colour light of pertinence promotion.

Optionally, the area of the projection of the second opening on the substrate is larger than the area of the projection of the first color light emitting unit on the substrate.

This optional mode can guarantee that the color resistance layer does not influence the light-emitting of the first color light-emitting unit, guarantees display panel's luminous efficacy.

Optionally, the first color is blue.

Because the light-emitting efficiency of the blue light is lower, the whole light-emitting efficiency of the display panel is improved by the realization mode through pertinently improving the light-emitting efficiency of the blue light.

Optionally, the color resistance layer is located between the 1/4 λ retardation film and the light-emitting layer.

Optionally, the display panel further includes a reflection reducing film disposed on a side of the light emitting layer away from the substrate.

In this alternative, the reflection of ambient light by the display panel may be further reduced.

A second aspect of the invention provides a display device comprising a display panel as described in the first aspect of the invention.

The invention has the following beneficial effects:

aiming at the existing problems, the invention provides the display panel and the display device, and the light transmittance of the display panel can be improved, the display effect is improved, and the power consumption of the display panel is reduced by adding the polarization beam splitting type semi-transparent and semi-reflective film which is used for transmitting the linearly polarized light with the first direction of vibration direction and reflecting the linearly polarized light with the second direction of vibration direction between the 1/4 lambda phase difference film and the polarization layer and matching with the polarization layer which transmits the linearly polarized light with the first direction.

Drawings

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

Fig. 1 is a schematic diagram illustrating that an OLED panel reflects external natural light in the related art.

FIG. 2 shows a schematic structure of a linearly polarizing layer combined with 1/4 lambda phase difference film.

FIG. 3 shows a schematic diagram of the linear polarizing layer of FIG. 2 combined with an 1/4 λ retarder film.

Fig. 4 is a schematic diagram of the principle of the light path of the light emitted from the display device comprising the linear polarizing layer of fig. 2 combined with the 1/4 λ retardation film.

Fig. 5 is a schematic cross-sectional view illustrating a display panel according to an embodiment of the invention.

Fig. 6 is a schematic diagram illustrating that the light extraction efficiency of the display panel with the transflective film according to the embodiment of the invention is improved.

Fig. 7 is a schematic diagram illustrating ambient light reflection of a display panel having a transflective film according to an embodiment of the present invention.

Fig. 8 is a schematic cross-sectional view illustrating a display panel according to an embodiment of the invention.

Fig. 9 illustrates a schematic plan view of the display panel shown in fig. 8.

Fig. 10 is a schematic cross-sectional view illustrating a display panel according to an embodiment of the present invention.

Fig. 11 illustrates a schematic plan view of the display panel shown in fig. 10.

Fig. 12 is a schematic cross-sectional view illustrating a display panel according to an embodiment of the present invention.

Fig. 13 is a schematic cross-sectional view illustrating a display panel according to an embodiment of the invention.

Fig. 14 is a schematic cross-sectional view illustrating a display panel according to an embodiment of the invention.

Fig. 15 is a schematic cross-sectional view illustrating a display panel according to an embodiment of the present invention.

Detailed Description

In order to more clearly illustrate the present invention, the present invention will be further described with reference to the following examples and the accompanying drawings. Similar components in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.

An Organic Light Emitting Diode (OLED) display panel has a strong reflection effect at a cathode (for example, made of Mg-Ag magnesium silver alloy) of the OLED display panel, so that contrast of the OLED display panel is reduced under strong ambient light, outdoor visibility is low, and as shown in fig. 1, an effect of the OLED display panel is affected.

Therefore, in the current OLED display panel, an antireflection layer including, for example, an 1/4 λ phase difference film and a polarizing layer is generally disposed on the side of the light emitting layer away from the substrate (i.e., the light emitting side of the display panel) to improve the reflection of ambient light. The concrete mode is as follows: as shown in fig. 2, 1/4 λ retardation film 101 and linear polarizing layer 102 are stacked in this order on the display panel. The principle of the display panel for eliminating ambient light reflection is shown in fig. 3: after the external environment light passes through the linear polarization layer 102 with the absorption axis in the vertical direction and the transmission axis in the horizontal direction, part of the environment light with the vertical absorption axis (i.e. the polarization direction is in the horizontal direction) can pass through, the light with the polarization direction in the vertical direction is absorbed, i.e. the natural light is changed into incident linear polarization light with the polarization direction in the horizontal direction, the incident linear polarization light with the polarization direction in the horizontal direction continues to advance, the incident linear polarization light passes through the 1/4 lambda phase difference film 101, the light is changed into left-handed circular polarization light from the incident linear polarization light with the polarization direction in the horizontal direction, the left-handed circular polarization light is rotated 180 degrees after being reflected by the OLED display panel to be changed into right-handed circular polarization light, the right-handed circular polarization light is changed into reflection linear polarization light after passing through the 1/4 lambda phase difference film 101 again, but the direction of the reflection linear polarization light is perpendicular to the incident linear polarization direction of the first passing through the 1/4 lambda phase difference film, namely, the linear polarization layer is changed into the reflective linear polarization with the polarization direction being the vertical direction, and the reflective linear polarization with the polarization direction being the vertical direction is parallel to the absorption axis of the linear polarization layer 102, so that the reflective linear polarization layer is absorbed by the linear polarization layer 102, thereby eliminating the reflection of the external environment light by the OLED display panel, ensuring the contrast of the OLED display panel, and enabling a user to clearly see the screen content even under strong sunlight.

However, the design greatly reduces the light extraction efficiency of the display panel, as shown in fig. 4, the light extraction path of the display panel is: after natural light emitted by the display panel passes through the 1/4 lambda phase difference film 101, the natural light emitted by the display panel can pass through, no light in any vibration direction can be absorbed, the natural light continues to advance, the natural light passes through the linear polarization layer 102, light with a vibration direction perpendicular to the absorption axis of the linear polarization layer 102, for example, the vertical direction can pass through, light with a vibration direction parallel to the absorption axis of the linear polarization layer 102 is absorbed, namely the natural light is changed into linearly polarized light with a horizontal polarization direction, at the moment, the natural light emitted by the panel is changed into light with a horizontal polarization direction perpendicular to the absorption axis of the linear polarization layer 102, namely, the horizontal polarization direction is left, therefore, the light emitted by the display panel seen by human eyes is less than 50% of the light emitted by the display panel, the actual situation is generally between 40% and 45%, the light emitting efficiency of the OLED display panel is reduced, and if people can see the intensity of the emitted light originally set by the OLED display panel, the display brightness of the OLED display panel must be increased, and the light-emitting brightness of the OLED display panel is increased at the cost of higher power consumption.

In view of this, an embodiment of the present invention provides a display panel, which may be an OLED display panel, as shown in fig. 5, the display panel includes a substrate 301, and a light emitting layer 302, 1/4 λ retardation film 303, a transflective film 304, and a polarizing layer 305 stacked on the substrate; the transflective film 305 is a polarization splitting transflective film.

Wherein the substrate 301 may be a glass substrate; the light emitting layer 302 includes light emitting units of a plurality of colors, and the light emitting units are arranged in an array on the substrate 301.

In one specific example, the polarization splitting transflective film 304 is composed of a multilayer optical film for transmitting linearly polarized light with a polarization direction of a first direction and reflecting linearly polarized light with a polarization direction of a second direction, wherein the first direction, such as a horizontal direction, is orthogonal to the second direction, such as a vertical direction.

In a specific example, the polarizing layer 305 may transmit light with a vibration direction parallel to the transmission axis of the polarizing layer and absorb light with a vibration direction perpendicular to the transmission axis of the polarizing layer, and in this embodiment, the polarizing layer 305 is configured to transmit linearly polarized light with a polarization direction of a first direction and absorb linearly polarized light with a polarization direction of a second direction.

Illustratively, the display panel may further include a cover plate disposed on the polarizing layer, and the cover plate may be a glass cover plate.

In a specific example, as shown in fig. 6, the display panel provided by the embodiment of the present invention has at least the following beneficial effects:

emitting light for the display panel: after light emitted by the light emitting layer 302 in the display panel passes through the 1/4 λ retardation film 303, natural light emitted by the light emitting layer 302 in the display panel can pass through, no light in any polarization direction is absorbed, the light continues to advance, passes through the polarization splitting type transflective film 304, transmits light in a first polarization direction, such as linearly polarized light in a horizontal direction, and reflects light in a second polarization direction, such as linearly polarized light in a vertical direction; linearly polarized light having a first polarization direction, for example, a vibration direction, which is transmitted through the polarization splitting type transflective film 304, is a horizontal direction, continues to travel through the polarizing layer 305, and the first polarization direction is parallel to a transmission axis of the polarizing layer 305, so that the linearly polarized light having the first polarization direction is transmitted through the polarizing layer 305 and is formed as light emitted from the display panel; the second direction linearly polarized light reflected by the polarization splitting transflective film 304 is reflected to the 1/4 λ retardation film 303 to become, for example, right-handed circularly polarized light, the right-handed circularly polarized light is reflected by a metal layer such as a cathode of the display panel and then rotates by 180 ° to become left-handed circularly polarized light, the left-handed circularly polarized light continues to advance, and after passing through the 1/4 λ retardation film 303, the left-handed circularly polarized light becomes first direction linearly polarized light, the first direction linearly polarized light continues to advance, and is transmitted through the polarization splitting transflective film 304 to remain as first direction linearly polarized light, and the first direction linearly polarized light continues to advance and passes through the polarization layer 305, and the first polarization direction is parallel to the transmission axis of the polarization layer 305, so that the first direction linearly polarized light transmits through the polarization layer 305 to become light emitted from the display panel. Therefore, the polarization beam splitting type semi-transparent and semi-reflective film 304 can improve the light transmittance of the display panel, improve the display effect and reduce the power consumption of the display panel.

However, although the light-emitting efficiency of the display panel can be improved by the polarizer-based transflective film 304 in this embodiment, the light-emitting efficiency of the display panel can be adversely affected to some extent by the reflection of the 1/4 λ retardation film 303 and the ambient light of the polarizer layer 305, as shown in fig. 7, the specific optical path is: natural light in the environment irradiates the polarizing layer 305, and half of the light becomes linearly polarized light with a first direction as a vibration direction, for example; linearly polarized light in the first direction still passes through the polarization splitting type semi-transparent and semi-reflective film 304 and is linearly polarized light in the first direction; linearly polarized light in the first direction passes through the 1/4 λ retardation film 303 to become, for example, left circularly polarized light; the left-handed circularly polarized light is reflected by the display panel and then rotates by 108 degrees to become right-handed circularly polarized light; the right-handed circularly polarized light passes through an 1/4 lambda phase difference film 303 to become linearly polarized light in a second direction; the linearly polarized light in the second direction is reflected by the polarization beam-splitting type semi-transparent and semi-reflective film 304 and still is linearly polarized light in the second direction; the linearly polarized light in the second direction passes through the 1/4 λ retardation film 303 to become, for example, right-handed circularly polarized light; the right-handed circularly polarized light is reflected by a metal layer such as a cathode of the display panel and then is rotated by 180 degrees to become left-handed circularly polarized light; the left circularly polarized light passes through an 1/4 lambda phase difference film 303 to become linearly polarized light in a first direction; linearly polarized light in the first direction still passes through the polarization splitting type semi-transparent and semi-reflective film 304 and is linearly polarized light in the first direction; the first-direction linearly polarized light is still the first-direction linearly polarized light after passing through the polarizing layer 305, so that the OLED display panel provided by this embodiment reflects a part of ambient light, but the reflection of the part of ambient light is relatively less, and the use of the OLED display panel is not affected.

Further, in order to improve the reflection of the ambient light, in a possible implementation manner, in the display panel provided in this embodiment, as shown in fig. 8, the display panel further includes a black matrix layer 306 disposed on a side of the light emitting layer away from the substrate 301.

In a specific example, the black matrix layer 306 is located between the 1/4 λ retardation film 303 and the light-emitting layer 302, the light-emitting layer 302 includes light-emitting units of multiple colors arranged in an array, and the black matrix layer 306 defines first openings arranged in an array so as not to affect the light-emitting display of the light-emitting units of multiple colors, and a projection of each first opening on the substrate covers a projection of one light-emitting unit on the substrate.

In one possible implementation, the area of the projection of the first opening on the substrate 301 is larger than the area of the projection of the light emitting unit on the substrate 301.

This optional mode can ensure that the black matrix layer 306 does not affect the light emission of each light emitting unit, and ensure the light emission efficiency of the display panel.

In a specific example, the polarization splitting transflective film 304 is applied to the full-wavelength band of visible light, i.e. transflective for red light, green light and blue light, the light-emitting layer 302 comprises light-emitting units of multiple colors arranged in an array, the light-emitting units of multiple colors comprise a red light-emitting unit R (302), a green light-emitting unit G (302) and a blue light-emitting unit B (302), the area of the projection of the first opening corresponding to the red light-emitting unit R (302) on the substrate 301 is larger than the area of the projection of the red light-emitting unit R (302) on the substrate, the area of the projection of the first opening corresponding to the green light-emitting unit G (302) on the substrate 301 is larger than the area of the projection of the green light-emitting unit G (302) on the substrate, the area of the projection of the first opening corresponding to the blue light-emitting unit B (302) on the substrate 301 is larger than the area of the projection of the blue light-emitting unit B (302) on the substrate 301, as shown in fig. 9, in a plan view, PDL in fig. 9 is a pixel defining layer, BM is a black matrix layer 306, the corresponding opening of the black matrix layer 306 is larger than the opening of the corresponding red light emitting unit of the pixel defining layer PDL, the corresponding opening of the black matrix layer 306 is larger than the opening of the corresponding green light emitting unit of the pixel defining layer PDL, and the corresponding opening of the black matrix layer 306 is larger than the opening of the corresponding blue light emitting unit of the pixel defining layer PDL, so the red light emitting unit, the green light emitting unit, and the blue light emitting unit are not shielded by the black matrix layer 306, and the black matrix layer 306 does not absorb the light emitted from the OLED display panel, and this design can make the black matrix layer 306 absorb the external ambient light incident to the inside of the display panel at the projection positions except for the light emitting unit, and reduce the light reflected to the outside by the metal electrode in the display panel while not affecting the light emitting display of the red light emitting unit, the green light emitting unit, and the blue light emitting unit, that is, the reflection of the display panel to the ambient light is reduced, so that the light-emitting efficiency of the display panel is improved by adding the transflective film 304, and a certain degree of negative effects of the transflective film 304 on the reflection of the ambient light is compensated and increased.

The OLED display panel is additionally provided with the polarization splitting transflective film 304 and the black matrix layer 306, and the light emitting optical path principle of the OLED display panel is the same as that of the display panel only provided with the polarization splitting transflective film 304, and the details are not repeated herein.

The reason why the black matrix layer 306 is located between the 1/4 λ retardation film 303 and the light-emitting layer 302 is that the process is easy to implement, the black matrix layer 306 may also be located between the 1/4 λ retardation film 303 and the polarization splitting transflective film 304, or between the polarization splitting transflective film 304 and the polarization layer 305, or the black matrix layer 306 may also be located in an encapsulation layer, for example, on the light-emitting layer 302 inside the display panel, and the specific location of the black matrix layer 306 is not limited in the present invention as long as the reflectance of the display panel to ambient light can be reduced.

In order to solve the problem of reflection of the display panel to ambient light caused by adding the transflective film on the basis of the existing display panel, in addition to adding the black matrix layer 306, the embodiment of the present invention may provide another implementation manner.

In another possible implementation manner, as shown in fig. 10, the light emitting units include a first color light emitting unit, a second color light emitting unit, and a third color light emitting unit, the transflective film 304 is a transflective film 304' that is transflective to the first color light and transmits to other colors except the first color light, the display panel further includes a color resist layer 307 disposed on a side of the light emitting layer 302 away from the substrate 301, the color resist layer 307 is configured to absorb the first color light, the color resist layer 307 is provided with second openings arranged in an array, and a projection of each of the second openings on the substrate 301 covers a projection of one of the first color light emitting units on the substrate 301.

In a specific example, the polarization-splitting transflective film is composed of a plurality of optical films, and the polarization-splitting transflective film can realize transflective of light of a part of wavelength bands and full transmission of light of other wavelength bands, that is, transflective of light of a first color and transmission of light of other colors except for the light of the first color, by matching the thicknesses and refractive indexes of the respective film layers.

In one possible implementation, the first color is blue.

For red light and green light, after the polarization splitting transflective film 304 ' is added, since the polarization splitting transflective film 304 ' transmits all the red light and the green light, the light path of the display panel is similar to the principle of the light path of the prior art in which the linear polarization layer is combined with the 1/4 λ retardation film as shown in fig. 4, that is, after the red light and the green light emitted from the display panel pass through the 1/4 λ retardation film 303, the red light and the green light emitted from the display panel can still pass through, no red light and green light in any vibration direction can be absorbed, the red light and the green light continue to advance, after passing through the polarization splitting transflective film 304 ', the red light and the green light emitted from the display panel can all transmit, and after passing through the polarization layer 305, the red light and the green light in the vibration direction perpendicular to the absorption axis of the polarization layer 305, such as the vertical direction, can pass through, and the red light and the green light in the vibration direction parallel to the absorption axis of the polarization layer 305 are both absorbed, the red and green light emitted from the panel at this time is converted from the red and green light of each vibration direction into red and green light of which only the direction perpendicular to the absorption axis, i.e., the polarization direction is horizontal, remains.

Meanwhile, the reflection of light in other bands except for blue light in the environment light can be eliminated, which is similar to the reflection reduction principle of the linear polarizing layer combined with the 1/4 λ phase difference film in fig. 3, that is, after the red light and the green light in the external environment pass through the polarizing layer 305 whose absorption axis is vertical direction and transmission axis is horizontal direction, the red light and the green light in the partial environment whose vertical absorption axis (i.e. polarization direction is horizontal direction) can pass through, the red light and the green light whose polarization direction is vertical direction are both absorbed, i.e. the red light and the green light in each polarization direction become incident linearly polarized red light and incident linearly polarized green light whose polarization direction is horizontal direction, the incident linearly polarized red light and the incident linearly polarized green light whose polarization direction is horizontal direction continue to advance, and pass through the polarization splitting transflective film 304 ', the polarization splitting transflective film 304' transmits the red light and the incident linearly polarized green light, the incident linearly polarized red light and the incident linearly polarized green light which are still in the horizontal direction of polarization pass through the 1/4 lambda phase difference film 303, the red light and the green light are changed into, for example, left circularly polarized red light and left circularly polarized green light from, for example, the incident linearly polarized red light and the incident linearly polarized green light in the horizontal direction of polarization, the left circularly polarized red light and the left circularly polarized green light are changed into right circularly polarized red light and right circularly polarized green light by rotating 180 degrees after being reflected by the display panel, the right circularly polarized red light and the right circularly polarized green light are changed into reflected linearly polarized red light and reflected linearly polarized green light after passing through the 1/4 lambda phase difference film 303 again, but the directions of the reflected linearly polarized red light and the reflected linearly polarized green light of this time are perpendicular to the directions of the incident linearly polarized red light and the incident linearly polarized green light which pass through the 1/4 lambda phase difference film 303 for the first time, namely, the reflected linearly polarized red light and the reflected linearly polarized green light with the polarization directions in the vertical direction are changed, the reflected linearly polarized red light and the reflected linearly polarized green light with the polarization directions in the vertical direction pass through the polarization splitting type transflective film 304', the reflected linearly polarized red light and the reflected linearly polarized green light with the polarization directions in the vertical direction are still the reflected linearly polarized red light and the reflected linearly polarized green light with the polarization directions in the vertical direction, pass through the polarization layer 305, and are parallel to the absorption axis of the polarization layer 305, so the reflected linearly polarized red light and the reflected linearly polarized green light with the polarization directions in the vertical direction are absorbed by the polarization layer 305, and the reflection of the red light and the green light in the external environment by the OLED display panel is eliminated.

For blue light, after the polarization splitting type transflective film 304 ' is added, since the polarization splitting type transflective film 304 ' is transflective to the blue light, the light-emitting optical path of the OLED display panel is consistent with that of the display panel shown in fig. 6, that is, after the blue light emitted by the display panel passes through the 1/4 λ phase difference film 303, the blue light emitted by the display panel can pass through, the blue light without any vibration direction is absorbed, the blue light continues to advance, passes through the polarization splitting type transflective film 304 ', passes through the blue light in the first polarization direction, and reflects the blue light in the second polarization direction; the blue light with the first polarization direction transmitted by the polarization splitting type transflective film 304' continues to advance, and passes through the polarizing layer 305, and since the blue light with the first polarization direction is parallel to the transmission axis of the polarizing layer 305, the blue light with the first polarization direction transmits through the polarizing layer 305 and becomes the blue light emitted by the display panel; the blue light with the second polarization direction reflected by the polarization beam splitting type transflective film 304' is reflected to the 1/4 lambda phase difference film 303 to become, for example, right-handed circularly polarized blue light, which is reflected by the display panel to become left-handed circularly polarized blue light, which continues to go forward, and after passing through the 1/4 lambda phase difference film 303, the blue light with the first polarization direction continues to advance and is transmitted through the polarization beam splitting type transflective film 304', and the blue light with the first polarization direction still remains as the blue light with the first polarization direction, and continues to advance and passes through the polarization layer 305 to become the blue light emitted from the display panel, namely, for blue light, since the transflective film 304' that is transflective for blue light is added, therefore, the light-emitting efficiency of the blue light of the display panel is improved, the whole light-emitting efficiency of the display panel is improved, and the power consumption of the display panel is reduced.

In addition, the transflective film 304' for transflective blue light has a negative effect on the ambient light elimination at other positions (including the positions of the red light-emitting unit, the green light-emitting unit and the pixel defining layer) except for the blue light-emitting unit, so that the OLED display panel can reflect a part of blue light in the ambient light at these positions, and the elimination of blue light in the ambient light is adversely affected. Based on this, in order to improve the reflection of blue light in ambient light, the display panel further includes a color resistance layer 307 for absorbing blue light, as shown in fig. 10, the color resistance layer 307 is disposed between the display panel and the 1/4 λ retardation film 303. The display panel includes a substrate 301, a light emitting layer 302 on the substrate, color resist layers 307, 1/4 lambda phase difference films 303, a transflective film 304', and a polarizing layer 305. The light emitting layer 302 includes light emitting units of a plurality of colors, i.e., a red light emitting unit R (302), a green light emitting unit G (302), and a blue light emitting unit B (302), arranged in an array. In order to not affect the light emitting display of the blue light emitting unit B (302), the color resistance layer 307 is provided with second openings arranged in an array at a position of the color resistance layer 307 corresponding to the blue light emitting unit, and the projection of each second opening on the substrate 301 covers the projection of one blue light emitting unit B (302) on the substrate 301, and in addition, the structure can reflect a part of blue light in the ambient light at the position of the blue light emitting unit B (302), so that the blue light emitting efficiency can be further improved by improving the whole blue light output quantity of the blue light emitting unit B (302).

In a possible implementation manner, the area of the projection of the second opening on the substrate 301 is larger than the area of the projection of the blue light emitting unit on the substrate 301.

In a specific example, the polarization splitting transflective film 304' only acts on the blue light band, i.e. only transflective for blue light and totally transmitting for other bands of light, the light emitting units 302 of multiple colors include a red light emitting unit R (302), a green light emitting unit G (302) and a blue light emitting unit B (302), since the color resistance layer 307 only absorbs blue light and transmits red light and green light, no opening is needed for the color resistance layer 307 at the corresponding positions of the red light emitting unit and the green light emitting unit, i.e. the projection of the color resistance layer 307 on the substrate covers the projection of the red light emitting unit R (302) and the green light emitting unit G (302) on the substrate, the color resistance layer 307 does not affect the light extraction efficiency of red light and green light, the color resistance layer 307 opens a second opening at the corresponding position of the blue light emitting unit B (302), the area of the projection of each second opening on the substrate 301 is larger than the area of the projection of the blue light emitting unit on the substrate 301, as shown in fig. 11, PDL is a pixel defining layer, CF is a color resistance layer absorbing blue light, and a second opening of the color resistance layer CF is larger than an opening of the blue light emitting unit corresponding to the pixel defining layer PDL; meanwhile, the design of the color resistance layer 307 absorbing blue light is added, and the color resistance layer 307 can absorb blue light components in the ambient light incident to the display panel at the projection positions except the blue light emitting unit, so that the reflection of the blue light in the ambient light by the projection positions except the blue light emitting unit of the display panel is reduced, and the reflection of the blue light in the ambient light by the polarization light splitting type semi-transparent and semi-reflective film 304' which is semi-transparent and semi-reflective to the blue light and transmits to red light and green light is increased, and the reflection of a part of the blue light in the ambient light at the position of the blue light emitting unit B (302) is caused to improve the light extraction efficiency of the blue light wave band of the OLED display panel, so that the whole light extraction efficiency of the OLED display panel is improved, and the reflection of the blue light in the ambient light at the projection positions except the blue light emitting unit is eliminated.

It should be noted that, in the embodiment of the present invention, the polarization splitting type transflective film may be further configured to be transflective to red light and transmit light of other bands except for red light, and the color resistance layer is correspondingly configured to absorb red light and the second opening projects a projection corresponding to the red light emitting unit, so as to improve the light emitting efficiency of red light; or, the polarization beam-splitting type semi-transparent and semi-reflective film is arranged to be semi-transparent and semi-reflective to green light and transmissive to other wave band light except the green light, the color resistance layer is correspondingly arranged to absorb the green light, and the projection of the second opening corresponds to the green light emitting unit, so that the light emitting efficiency of the green light is improved.

In one possible implementation manner, the display panel further includes a reflection reducing film 308 disposed on a side of the light emitting layer 302 away from the substrate.

In a specific example, the Anti-reflective film 308 is an AR (Anti-Reflection) film, and the Anti-reflective film 308 may be formed by a chemical vapor deposition (PECVD), specifically: introducing SiH with a set amount under a set pressure and power₄、N₂O、H₂And depositing for a set time period to obtain the required antireflection film 308.

In one specific example, the antireflection film 308 is disposed above the polarizing layer 305, and the design of the antireflection film 308 can further reduce the reflection of ambient light by the display panel.

As shown in fig. 12-15, a specific structure including the antireflection film 308 in several groups of OLED display panels is shown for the embodiment of the present invention.

The first structure is that the display panel of fig. 12 includes a substrate 301, light emitting units 302, 1/4 λ retardation films 303, a transflective film 304, a polarizing layer 305, and a reflection reducing film 308, which are stacked and arranged on the substrate.

The second structure is that the display panel of fig. 13 includes a substrate 301, light emitting units 302 arranged in an array on the substrate, a black matrix layer 306, an 1/4 λ retardation film 303, a transflective film 304, a polarizing layer 305, and a reflection reducing film 308.

The third structure is that the display panel of fig. 14 includes a substrate 301, light emitting units 302 arranged in an array on the substrate, color resists 307, 1/4 λ retardation films 303, transflective films 304, polarizing layers 305, and antireflection films 308.

The fourth structure is that the display panel of fig. 15 includes a substrate 301, light emitting units 302 arranged in an array on the substrate, a black matrix layer 306, color resistance layers 307 and 1/4 λ retardation films 303, a transflective film 304, a polarizing layer 305, and a reflection reducing film 308.

It should be noted that the antireflection film 308 may be disposed between the polarization-splitting transflective film 304 and the polarizing layer 305, or disposed between the polarization-splitting transflective film 304 and the 1/4 λ retardation film 303, and the specific position of the antireflection film 308 is not limited in this embodiment as long as the effect of further reducing the reflectance of the ambient light can be achieved.

In a specific example, the OLED display panel further includes a buffer layer, a driving circuit layer, an encapsulation layer, and other functional film layers disposed on the substrate 301. For example, the light-emitting layer 302 may be formed on the driving circuit layer by an evaporation method, and then, the light-emitting layer is encapsulated by a Thin-Film Encapsulation (TFE) to form an Encapsulation layer, for example, a Film layer covering the light-emitting layer 302 in fig. 5, 8, and the like. Illustratively, the encapsulation layer is located on a cathode of the display panel. The packaging layer at least comprises a 3-layer structure and comprises an inorganic packaging layer and an organic packaging layer, wherein the inorganic packaging layer is formed in a deposition mode and the like, and the organic packaging layer is formed in an ink-jet printing mode. For example, the inorganic encapsulating layer may be formed using an inorganic material such as silicon nitride, silicon oxide, or silicon oxynitride, and the organic encapsulating layer may be formed using an organic material such as Polyimide (PI) or epoxy resin. Therefore, the inorganic packaging layer and the organic packaging layer form a composite packaging layer, the composite packaging layer can form multiple protection on the functional structure of the display area, and the packaging effect is better.

In a possible implementation manner, the display panel further includes a 1/2 λ phase difference film disposed between the 1/4 λ phase difference film 303 and the polarizing layer 305, and a 1/2 λ phase difference film may also be disposed between the polarization splitting transflective film 304 and the polarizing layer 305, for example, the 1/2 λ phase difference film is a color adjustment layer, and includes a layer having a 1/2 λ phase difference layer, and the color adjustment layer is used for color correction to further reduce reflection of the OLED display panel to the external environment light, and the 1/2 λ phase difference film does not affect the light transmittance of the final OLED display panel.

Another embodiment of the present invention provides a display device, which may include the display panel of any of the above embodiments, and the specific structure and beneficial effects thereof may refer to the embodiment of the display panel, which is not described herein again. The display device may be an electronic device with an image display function, such as a mobile phone, a tablet computer, a television, etc., which are not listed herein.

The terms "on … …", "on … …" and "disposed on … …" as used herein mean that one layer is formed or disposed directly on another layer, or that one layer is formed or disposed indirectly on another layer, i.e., that another layer is present between the two layers.

It should be noted that, although the terms "first", "second", etc. may be used herein to describe various elements, components, elements, regions, layers and/or sections, these elements, components, elements, regions, layers and/or sections should not be limited by these terms. Rather, these terms are used to distinguish one element, component, element, region, layer or section from another. Thus, for example, a first component, a first member, a first element, a first region, a first layer, and/or a first portion discussed below could be termed a second component, a second member, a second element, a second region, a second layer, and/or a second portion without departing from the teachings of the present invention.

In the present invention, unless otherwise specified, the term "disposed on the same layer" is used to mean that two layers, components, members, elements or portions may be formed by the same manufacturing process (e.g., patterning process, etc.), and the two layers, components, members, elements or portions are generally formed of the same material. For example, two or more functional layers are arranged in the same layer, which means that the functional layers arranged in the same layer can be formed by using the same material layer and using the same manufacturing process, so that the manufacturing process of the display substrate can be simplified.

In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

It is further noted that, in the description of the present invention, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations and modifications can be made on the basis of the above description, and all embodiments cannot be exhaustive, and all obvious variations and modifications belonging to the technical scheme of the present invention are within the protection scope of the present invention.

Claims

1. A display panel is characterized by comprising a substrate, a luminescent layer, an 1/4 lambda phase difference film, a semi-transparent and semi-reflective film and a polarizing layer which are laminated on the substrate; the semi-transparent and semi-reflective film is a polarization beam splitting type semi-transparent and semi-reflective film.

2. The display panel according to claim 1, further comprising a black matrix layer disposed on a side of the light emitting layer away from the substrate, wherein the light emitting layer includes light emitting units arranged in an array, the black matrix layer defines first openings arranged in an array, and a projection of each of the first openings on the substrate covers a projection of one of the light emitting units on the substrate.

3. The display panel according to claim 1, wherein an area of a projection of the first opening on the substrate is larger than an area of a projection of the light-emitting unit on the substrate.

4. The display panel according to claim 2, wherein the black matrix layer is located between the 1/4 λ retardation film and the light-emitting layer.

5. The display panel according to any one of claims 1 to 4, wherein the light emitting units include a first color light emitting unit, a second color light emitting unit, and a third color light emitting unit, the transflective film is a transflective film that is transflective to light of a first color and is transmissive to light of other colors except the light of the first color, the display panel further includes a color resist layer disposed on a side of the light emitting layer away from the substrate, the color resist layer is configured to absorb light of the first color, the color resist layer is provided with second openings arranged in an array, and a projection of each of the second openings on the substrate covers a projection of one of the first color light emitting units on the substrate.

6. The display panel according to claim 5, wherein an area of a projection of the second opening on the substrate is larger than an area of a projection of the first color light-emitting unit on the substrate.

7. The display panel according to claim 5, wherein the first color is blue.

8. The display panel according to claim 5, wherein the color resistance layer is located between the 1/4 λ retarder film and the light-emitting layer.

9. The display panel according to claim 1, further comprising a antireflection film provided on a side of the light-emitting layer away from the substrate.

10. A display device comprising the display panel according to any one of claims 1 to 9.