CN114430015A - A display panel and display device - Google Patents

Abstract

Embodiments of the present invention disclose a display panel and a display device. In a specific embodiment, the display panel includes a substrate, and a light-emitting layer, a 1/4λ retardation film, a transflective film and a polarizing layer stacked on the substrate; The film is a polarized beam splitting semi-transparent and semi-reflective film. This embodiment can improve the light transmittance of the display panel, improve the display effect, and reduce the power consumption of the display panel.

Description

A display panel and display device

technical field

The present invention relates to the field of display technology. More specifically, it relates to a display panel and a display device.

Background technique

At present, display panels have become an indispensable component of electronic devices such as mobile phones and computers. In order to avoid the reflection of the external light by the display panel, the visibility is low. Therefore, a 1/4λ phase difference film and a polarizing layer are usually arranged on the light-emitting side of the display panel. At this time, the natural light (ie, unpolarized light) emitted from the display panel is still natural light after passing through the 1/4λ phase difference film. After the polarizing layer, the light whose vibration direction is parallel to the transmission axis of the polarizing layer is transmitted, and the light whose vibration direction is parallel to the absorption axis of the polarizing layer is absorbed by the polarizing layer. The transmittance of the light emitted from the display panel cannot exceed 50%, resulting in the display panel. The luminous efficiency is low.

SUMMARY OF THE INVENTION

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

To achieve the above object, the present invention adopts the following technical solutions:

A first aspect of the present invention provides a display panel, comprising a substrate, and a light-emitting layer, a 1/4λ retardation film, a semi-transparent and semi-reflective film, and a polarizing layer stacked on the substrate; The reflective film is a polarized beam splitting semi-transparent and semi-reflective film.

In the display panel provided by the first aspect of the present invention, by adding between the 1/4λ retardation film and the polarizing layer, it is used to transmit the linearly polarized light whose vibration direction is the first direction and reflect the linearly polarized light whose vibration direction is the second direction. The polarizing beam-splitting transflective film, combined with the polarizing layer that transmits linearly polarized light in the first direction, can improve the light transmittance of the display panel, improve the display effect, and reduce the power consumption of the display panel.

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, and the black matrix layer is provided with an array row. The first openings of the cloth, and the projection of each of the first openings on the substrate covers the projection of one of the light-emitting units on the substrate.

In this optional way, by adding a black matrix layer for light absorption in the display panel, the external ambient light incident on the display panel can be absorbed, and the reflection of the ambient light by the display panel can be reduced, thereby increasing the transflective film to improve the display. While improving the light output efficiency of the panel, it also compensates the negative impact of adding a transflective film on the reflection of ambient light to a certain extent.

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

This optional method can ensure that the black matrix layer does not affect the light output of each light-emitting unit, thereby ensuring the light output efficiency of the display panel.

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

This optional method can 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, and the transflective film is transflective for the first color light and for removing the first color. A transflective film that transmits light other than light, the display panel further includes a color resist layer disposed on the side of the light emitting layer away from the substrate, the color resist layer is used to absorb the first For color light, the color resist layer is provided with second openings arranged in an array, and the projection of each second opening on the substrate covers the projection of a first color light-emitting unit on the substrate .

In this optional way, by adding a transflective film that is transflective for the first color light and transmits light of other colors except the first color light, combined with a second opening corresponding to the first color light-emitting unit The color resist layer used to absorb the first color light can compensate for the negative impact of increasing the transflective film on the reflection of ambient light to a certain extent, and at the same time improve the light extraction efficiency of the first color light by targeted improvement. The overall light extraction efficiency of the display panel.

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

This optional method can ensure that the color resist layer does not affect the light output of the first color light-emitting unit, and ensure the light output efficiency of the display panel.

Optionally, the first color is blue.

Since the light extraction efficiency of blue light is low, this implementation improves the overall light extraction efficiency of the display panel by specifically improving the light extraction efficiency of blue light.

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

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

This optional method can further reduce the reflection of ambient light by the display panel.

A second aspect of the present invention provides a display device including the display panel according to the first aspect of the present invention.

The beneficial effects of the present invention are as follows:

Aiming at the existing problems, the present invention provides a display panel and a display device. By adding between the 1/4λ retardation film and the polarizing layer, the vibration direction is linearly polarized light in the first direction and the reflection vibration direction is The polarizing beam splitting transflective film for linearly polarized light in the second direction, combined with the polarizing layer that transmits linearly polarized light in the first direction, can improve the light transmittance of the display panel, improve the display effect, and reduce the power consumption of the display panel .

Description of drawings

The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

FIG. 1 shows a schematic diagram of an OLED panel reflecting external natural light in the related art.

FIG. 2 shows a schematic structural diagram of a linear polarizing layer combined with a 1/4λ retardation film.

FIG. 3 shows a schematic diagram of antireflection of the linear polarizing layer shown in FIG. 2 combined with a 1/4λ retardation film.

FIG. 4 is a schematic diagram showing the principle of the light exit light path of the display device including the linear polarizing layer shown in FIG. 2 combined with the 1/4λ retardation film.

FIG. 5 shows a schematic cross-sectional structure diagram of a display panel provided by an embodiment of the present invention.

FIG. 6 shows a schematic diagram of improving light extraction efficiency of a display panel provided with a transflective film provided by an embodiment of the present invention.

FIG. 7 shows a schematic diagram of reflection of external ambient light of a display panel with a transflective film provided by an embodiment of the present invention.

FIG. 8 shows another schematic cross-sectional structure diagram of a display panel provided by an embodiment of the present invention.

FIG. 9 shows a schematic plan view of the display panel shown in FIG. 8 .

FIG. 10 shows another schematic cross-sectional structure diagram of a display panel provided by an embodiment of the present invention.

FIG. 11 is a schematic plan view of the display panel shown in FIG. 10 .

FIG. 12 shows another schematic cross-sectional structure diagram of a display panel provided by an embodiment of the present invention.

FIG. 13 shows another schematic cross-sectional structure diagram of a display panel provided by an embodiment of the present invention.

FIG. 14 shows another schematic cross-sectional structure diagram of a display panel provided by an embodiment of the present invention.

FIG. 15 shows another schematic cross-sectional structure diagram of a display panel provided by an embodiment of the present invention.

Detailed ways

In order to illustrate the present invention more clearly, the present invention will be further described below with reference to the embodiments and accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention.

Organic Light Emitting Diode (OLED) display panels, because the cathode of the OLED display panel (for example, the material is Mg-Ag magnesium-silver alloy) has a strong reflective effect, which leads to a decrease in the contrast ratio of the OLED display panel under strong ambient light. The viewing angle is low, as shown in Figure 1, which affects the effect of the OLED display panel.

Therefore, in the current OLED display panel, an antireflection layer, such as a 1/4λ retardation film and a polarizing layer, is usually arranged on the side of the light-emitting layer away from the substrate (ie, the light-emitting side of the display panel) to improve the reflection of ambient light. . The specific method is as follows: as shown in FIG. 2 , a 1/4λ retardation film 101 and a linear polarizing layer 102 are sequentially stacked on the display panel. The principle of the display panel for eliminating the reflection of ambient light is shown in FIG. 3 : the external ambient light passes through the linear polarizing layer 102 whose absorption axis is a vertical direction and a transmission axis is a horizontal direction, for example, the vertical absorption axis (that is, the polarization direction is the horizontal direction) Part of the ambient light can pass through, and the light with the vertical polarization direction is absorbed, that is, the natural light becomes the incident ray polarized light with the horizontal polarization direction, and the incident ray polarized light with the horizontal polarization direction continues to advance, after 1/ 4λ retardation film 101, the light is changed from incident line polarized light whose polarization direction is horizontal direction to, for example, left-handed circularly polarized light. After the right-handed circularly polarized light passes through the 1/4λ retardation film 101 again, the right-handed circularly polarized light becomes the reflected linearly polarized light, but the direction of the reflected linearly polarized light this time is the same as that of the first time through the 1/4λ retardation film. The direction of the ray polarized light is vertical, that is, it becomes the reflected linearly polarized light whose polarization direction is the vertical direction. The reflected linearly polarized light whose polarization direction is the vertical direction is parallel to the absorption axis of the linear polarizing layer 102, so it is absorbed by the linear polarizing layer 102, thereby eliminating the The OLED display panel reflects the external ambient light to ensure the contrast of the OLED display panel itself. Even under strong sunlight, users can clearly see the screen content.

However, this design greatly reduces the light emitting efficiency of the display panel. As shown in Figure 4, the light emitting path of the display panel is: after the natural light emitted by the display panel passes through the 1/4λ retardation film 101, the natural light emitted by the display panel can pass through without any The light in the vibration direction is absorbed, and the natural light continues to advance. After passing through the linear polarizing layer 102, the light whose vibration direction is perpendicular to the absorption axis of the linear polarizing layer 102, such as the vertical direction, can pass through, and the light whose vibration direction is parallel to the absorption axis of the linear polarizing layer 102 is absorbed. That is, the natural light becomes the outgoing line polarized light whose polarization direction is the horizontal direction. At this time, the natural light emitted from the panel changes from the light in each vibration direction to the light that is only perpendicular to the absorption axis direction of the linear polarizing layer 102, that is, the polarization direction is the horizontal direction. Therefore, the light emitted by the display panel seen by the human eye is less than 50% of the light emitted by the display panel. The actual situation is generally between 40% and 45%, resulting in a decrease in the light output efficiency of the OLED display panel. If the human eye can see the OLED The intensity of the emitted light originally set by the display panel must increase the display brightness of the OLED display panel, and increase the brightness of the OLED display panel at the expense of higher power consumption.

In view of this, an embodiment of the present invention provides a display panel, and the display panel may be an OLED display panel. As shown in FIG. 5 , the display panel provided by the embodiment of the present invention includes a substrate 301, and is stacked on the The light-emitting layer 302, the 1/4λ retardation film 303, the transflective film 304 and the polarizing layer 305 on the substrate; the transflective film 305 is a polarized beam splitting type transflective film.

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

In a specific example, the polarizing beam splitting transflective film 304 is composed of a multilayer optical film, which is used to transmit linearly polarized light whose polarization direction is the first direction and reflect linearly polarized light whose polarization direction is the second direction light, wherein a first direction such as a horizontal direction is orthogonal to a second direction such as a vertical direction.

In a specific example, the polarizing layer 305 can transmit light whose vibration direction is parallel to the transmission axis of the polarizing layer, and absorb light whose vibration direction is perpendicular to the transmission axis of the polarizing layer. In this embodiment, the polarizing layer 305 is used for The linearly polarized light whose polarization direction is the first direction is transmitted, and the linearly polarized light whose polarization direction is the second direction is absorbed.

Exemplarily, 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:

Lighting for the display panel: after the light emitted by the light-emitting layer 302 in the display panel passes through the 1/4λ retardation film 303, the natural light emitted by the light-emitting layer 302 in the display panel can pass through, and no light in any polarization direction is absorbed, and the light continues to advance , through the polarizing beam splitting transflective film 304, transmits the light in the first polarization direction, such as the linearly polarized light whose vibration direction is the horizontal direction, and reflects the light in the second polarization direction, such as the linearly polarized light whose vibration direction is the vertical direction The first polarization direction transmitted by the polarized beam splitting type transflective film 304, for example, the linearly polarized light whose vibration direction is the horizontal direction continues to advance, and passes through the polarizing layer 305, because the first polarizing direction is parallel to the transmission axis of the polarizing layer 305, so the first The linearly polarized light in one direction is transmitted through the polarizing layer 305 to form the light emitted from the display panel; the linearly polarized light in the second direction reflected by the polarized beam splitting transflective film 304 is reflected to the 1/4λ retardation film 303 to become, for example, Right-handed circularly polarized light, the right-handed circularly polarized light is rotated by 180° after being reflected by a metal layer such as a cathode of the display panel and becomes a left-handed circularly polarized light, and the left-handed circularly polarized light continues to advance, and after passing through the 1/4λ phase difference film 303, It becomes linearly polarized light in the first direction, the linearly polarized light in the first direction continues to advance, and is transmitted through the polarized beam splitting transflective film 304, and it is still linearly polarized light in the first direction, and the linearly polarized light in the first direction continues to advance, and passes through the polarized light. In the layer 305 , since the first polarization direction is parallel to the transmission axis of the polarizing layer 305 , the linearly polarized light in the first direction passes through the polarizing layer 305 and is formed as light emitted from the display panel. Therefore, the polarized light splitting type transflective 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, in this embodiment, although the polarizing beam splitting transflective film 304 can improve the light extraction efficiency of the display panel, it will bring a certain degree of negative effects on the ambient light drop of the 1/4λ retardation film 303 and the polarizing layer 305 . As shown in FIG. 7, the specific optical path is: the natural light in the environment illuminates the polarizing layer 305, and half of the light becomes, for example, linearly polarized light whose vibration direction is the first direction; The reflective film 304 is still linearly polarized light in the first direction; the linearly polarized light in the first direction is transformed into, for example, left-handed circularly polarized light through the 1/4λ phase difference film 303; It is a right-handed circularly polarized light; the right-handed circularly polarized light is transformed into the second-direction linearly polarized light through the 1/4λ phase difference film 303; Linearly polarized light in the second direction; the linearly polarized light in the second direction becomes, for example, right-handed circularly polarized light through the 1/4λ retardation film 303; the right-handed circularly polarized light is reflected by a metal layer such as a cathode of the display panel and then rotated 180° Then it becomes left-handed circularly polarized light; the left-handed circularly polarized light passes through the 1/4λ retardation film 303 and becomes linearly polarized light in the first direction; Linearly polarized light in one direction; the linearly polarized light in the first direction is still linearly polarized in the first direction after passing through the polarizing layer 305 , so the OLED display panel provided in this embodiment will reflect a part of the ambient light, but the reflection of this part of the ambient light is relatively low Less, will not affect the use of OLED display panel.

Further, in order to improve the reflection of ambient light, in a possible implementation manner, in the display panel provided in this embodiment, as shown in FIG. Black matrix layer 306 on one side of substrate 301 .

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

In a possible implementation manner, the projected area of the first opening on the substrate 301 is larger than the projected area of the light-emitting unit on the substrate 301 .

This optional method can ensure that the black matrix layer 306 does not affect the light emitting of each light-emitting unit, thereby ensuring the light emitting efficiency of the display panel.

In a specific example, the polarized light-splitting transflective film 304 acts on the entire wavelength range of visible light, that is, transflective for red light, green light and blue light, and the light-emitting layer 302 includes light-emitting units of multiple colors arranged in an array , the light-emitting units 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), and the first opening corresponding to the red light-emitting unit R (302) is in the substrate The projected area on 301 is larger than the projected area of the red light emitting unit R (302) on the substrate, and the projected area of the first opening corresponding to the green light emitting unit G (302) on the substrate 301 is greater than the green light emitting area The projected area of the unit G ( 302 ) on the substrate, corresponding to the projected area of the first opening of the blue light emitting unit B ( 302 ) on the substrate 301 is greater than the projected area of the blue light emitting unit B ( 302 ) on the substrate 301 9, PDL is the pixel defining layer, BM is the 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 black matrix The corresponding opening of the 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 corresponding to the blue light emitting unit of the pixel defining layer PDL, so the black matrix layer 306 will not block the red light emitting. unit, green light emitting unit and blue light emitting unit, the black matrix layer 306 will not absorb the light emitted from the OLED display panel. The black matrix layer 306 absorbs the external ambient light incident to the interior of the display panel from the projection positions other than the light-emitting unit, and reduces its reflection back to the outside world by the metal electrodes in the display panel, that is, reduces the reflection of ambient light by the display panel, thereby increasing the The transflective film 304 can improve the light extraction efficiency of the display panel, and at the same time compensate for the negative impact of adding the transflective film 304 on the reflection of ambient light to a certain extent.

The OLED display panel adds the design of the polarizing beam splitting transflective film 304 and the black matrix layer 306. The principle of the light path is the same as the light path principle of the above-mentioned display panel only adding the polarizing beam splitting transflective film 304, which is not repeated here. Repeat.

It should be noted that the black matrix layer 306 is located between the 1/4λ retardation film 303 and the light-emitting layer 302 for easy process realization, and the position of the black matrix layer 306 can also be set between the 1/4λ retardation film 303 and the polarization beam splitter. Between the transflective films 304, or between the polarizing beam splitting transflective film 304 and the polarizing layer 305, or, the black matrix layer 306 can also be provided on the light-emitting layer 302 inside the display panel, such as an encapsulation layer. Among them, as long as the reflectivity of the display panel to ambient light can be reduced, the present invention does not limit the specific arrangement position of the black matrix layer 306 .

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

In another possible implementation manner, as shown in FIG. 10 , the light-emitting unit includes a first-color light-emitting unit, a second-color light-emitting unit and a third-color light-emitting unit, and the transflective film 304 is for the first color light-emitting unit. A transflective film 304 ′ that is transflective for color light and transmits light of other colors except the first color light, the display panel further includes a light emitting layer 302 that is far from the substrate 301 A color resist layer 307 on one side, the color resist layer 307 is used for absorbing the first color light, the color resist layer 307 is provided with second openings arranged in an array, each of the second openings is in the substrate The projection on 301 covers the projection of the first color light-emitting unit on the substrate 301 .

In a specific example, the polarizing beam splitting transflective film is composed of multiple layers of optical films, and the thickness and refractive index of each film layer can be matched to realize the polarization beam splitting transflective film. Transflective and fully transmits light in other wavelength bands, that is, realizes transflective for the first color light and transmits light of other colors except the first color light.

In a possible implementation manner, the first color is blue.

For red light and green light, after adding the polarizing beam splitting transflective film 304', since the polarizing beam splitting transflective film 304' transmits all the red light and green light, the light path of the display panel is the same as that shown in FIG. 4 . As shown in the prior art, the light path principle of the combination of the linear polarizing layer and the 1/4λ retardation film is similar, that is, after the red light and green light emitted from the display panel pass through the 1/4λ retardation film 303, the red light and green light emitted by the display panel It can still all pass through, no red and green light in any vibration direction is absorbed, and the red and green light continues to advance. After passing through the polarized beam splitting transflective film 304', the red and green light emitted by the display panel are all transmitted. , through the polarizing layer 305, the red light and green light whose vibration direction is perpendicular to the absorption axis of the polarizing layer 305, such as the vertical direction, can pass through, and the red light and green light whose vibration direction is parallel to the absorption axis of the polarizing layer 305 are absorbed. The outgoing red light and green light are converted from red light and green light in each vibration direction to red light and green light that are perpendicular to the direction of the absorption axis, that is, the polarization direction is the horizontal direction.

At the same time, the reflection of light in other wavelength bands except blue light in ambient light will be eliminated. For example, after the light passes through the polarizing layer 305 whose absorption axis is the vertical direction and the transmission axis is the horizontal direction, the red light and green light in part of the environment with the vertical absorption axis (that is, the polarization direction is the horizontal direction) can pass through, and the polarization direction is the vertical direction. The red light and green light are absorbed, that is, the red and green light in each polarization direction becomes the incident ray polarized red light and the incident ray polarized green light whose polarization direction is the horizontal direction, and the incident ray polarized light whose polarization direction is the horizontal direction The red light and the incident ray polarized green light continue to move forward, and pass through the polarized beam splitting transflective film 304', which transmits the red light and the green light, and is still the incident polarized light in the horizontal direction. The ray polarized red light and the incident ray polarized green light, after passing through the 1/4λ retardation film 303, the red light and the green light, for example, the incident ray polarized red light and the incident ray polarized green light whose polarization direction is the horizontal direction, become, for example, a left-handed circle. Polarized red light and left-circularly polarized green light, left-circularly polarized red light and left-circularly polarized green light are reflected by the display panel and then rotated 180° to become right-circularly polarized red light and right-circularly polarized green light. After the polarized red light and the right-circularly polarized green light pass through the 1/4λ retardation film 303 again, the right-circularly polarized red light and the right-circularly polarized green light become the reflected linearly polarized red light and the reflected linearly polarized green light. The direction of the second reflected linearly polarized red light and the reflected linearly polarized green light is perpendicular to the direction of the incident line polarized red light and the incident line polarized green light that passed through the 1/4λ retardation film 303 for the first time, that is, the polarization direction becomes the vertical direction. The reflected linearly polarized red light and the reflected linearly polarized green light, the reflected linearly polarized red light and the reflected linearly polarized green light whose polarization direction is the vertical direction are still polarized by the polarized beam splitting transflective film 304', and the polarization direction is the vertical direction. The reflected linearly polarized red light and the reflected linearly polarized green light pass through the polarizing layer 305, and the reflected linearly polarized red light and the reflected linearly polarized green light whose polarization direction is the vertical direction are parallel to the absorption axis of the polarizing layer 305, so they are absorbed by the polarizing layer 305, Thus, the reflection of the red light and green light in the external environment by the OLED display panel is eliminated.

For blue light, after adding the polarizing beam splitting transflective film 304', since the polarizing beam splitting transflective film 304' is transflective to blue light, the light exit path of the OLED display panel is the same as that of the display panel shown in FIG. 6 . The light path of the light output is the same, that is, after the blue light emitted from the display panel passes through the 1/4λ phase difference film 303, the blue light emitted from the display panel can pass through, and the blue light without any vibration direction is absorbed. 304', transmits the blue light in the first polarization direction, and reflects the blue light in the second polarization direction; the blue light in the first polarization direction transmitted by the polarized beam splitting transflective film 304' continues to advance, and passes through the polarizing layer 305. The blue light in the direction is parallel to the transmission axis of the polarizing layer 305, so the blue light in the first polarization direction passes through the polarizing layer 305 and becomes the blue light emitted by the display panel; The blue light is reflected to the 1/4λ retardation film 303, and becomes, for example, right-hand circularly polarized blue light, which is reflected by the display panel and becomes left-handed circularly polarized blue light, and the left-hand circularly polarized blue light continues to advance, after 1/4λ bit. After the phase difference film 303, it becomes the blue light of the first polarization direction, the blue light of the first polarization direction continues to advance, and is transmitted through the polarized beam splitting transflective film 304', which is still the blue light of the first polarization direction, and the blue light of the first polarization direction. The blue light continues to move forward, passes through the polarizing layer 305, and becomes the blue light emitted by the display panel, that is, for blue light, because the transflective film 304' is added to the blue light, the blue light of the display panel is improved. At the same time, the overall light extraction efficiency of the display panel is improved, and the power consumption of the display panel is reduced.

In addition, the transflective film 304 ′ for the blue light transflective will bring about the elimination of ambient light at other locations (including the red light emitting unit, the green light emitting unit and the pixel defining layer location) except the blue light emitting unit. The negative effect causes the OLED display panel to reflect a part of the blue light in the ambient light at these positions, which has an adverse effect on the elimination of the blue light in the ambient light. Based on this, in order to improve the reflection of blue light in ambient light, the display panel further includes a color resist layer 307 for absorbing blue light. As shown in FIG. 10 , the color resist layer 307 is arranged between the display panel and the 1/4λ position between the phase difference films 303 . The display panel includes a substrate 301, a light-emitting layer 302 on the substrate, a color resist layer 307, a 1/4λ retardation film 303, a transflective film 304' and a polarizing layer 305. The light-emitting layer 302 includes light-emitting units of multiple colors arranged in an array, namely, a red light-emitting unit R ( 302 ), a green light-emitting unit G ( 302 ), and a blue light-emitting unit B ( 302 ). In order not to affect the light-emitting display of the blue light-emitting unit B (302), the color-resist layer 307 is provided with a second opening arranged in an array at the position of the color-resist layer 307 corresponding to the blue light-emitting unit. The projection on the bottom 301 covers the projection of a blue light emitting unit B (302) on the substrate 301. In addition, this structure will cause a part of the blue light in the ambient light to be reflected at the position of the blue light emitting unit B (302), so that The blue light emitting efficiency is further improved by increasing the overall blue light output of the blue light emitting unit B (302).

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

In a specific example, the polarized light-splitting transflective film 304 ′ only acts on the blue light band, that is, only transflects the blue light and transmits all other wavelengths of light, and the light-emitting units 302 of multiple colors include red light-emitting units R ( 302 ), green light emitting unit G ( 302 ), and blue light emitting unit B ( 302 ), since the color resist layer 307 is only used to absorb blue light and transmit red light and green light, the color resist layer 307 is only used for absorbing blue light and transmitting red light and green light. No opening is required at the positions of the light-emitting unit and the green light-emitting unit, that is, the projection of the color resist 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 resist layer 307 also does not affect the light extraction efficiency of red light and green light. The color resist layer 307 has a second opening at the position corresponding to the blue light emitting unit B ( 302 ), and each of the second openings is on the substrate 301 The projected area of the blue light-emitting unit is larger than the projected area of the blue light-emitting unit on the substrate 301. Its plan view is shown in FIG. 11. In FIG. 11, PDL is a pixel defining layer, CF is a color resist layer that absorbs blue light, and the color The second opening of the blocking layer CF is larger than the opening of the pixel defining layer PDL corresponding to the blue light emitting unit. Since the red light and green light have higher light emitting efficiency, the blue light has a lower light emitting efficiency, thus increasing the transflective for blue light and the increase for red light. The design of the polarized beam-splitting transflective film 304' that transmits and green light improves the light extraction efficiency of blue light, and thus improves the overall light extraction efficiency of the OLED display panel. The color resist layer 307 absorbs the blue light components in the ambient light incident inside the display panel from the projection position other than the blue light emitting unit, thereby reducing its reflection back to the outside world by the metal electrodes in the display panel, that is, reducing the blue light emission of the display panel in addition to blue light The projection position outside the unit reflects the blue light in the ambient light, so as to increase the polarized beam splitting transflective film 304' that is transflective to blue light and transmits red and green light and makes the blue light emitting unit B At the position of (302), a part of the blue light in the ambient light is reflected to improve the light extraction efficiency of the blue light band of the OLED display panel, thereby improving the overall light extraction efficiency of the OLED display panel, while eliminating the projection position except the blue light emitting unit. Blue light reflections in ambient light.

It should be noted that, in the embodiment of the present invention, the polarizing beam splitting type transflective film can also be set to be translucent and transflective for red light and transmit light in other wavelength bands except red light, and a color blocking layer can be set correspondingly to absorb red light. light and the second opening projection corresponds to the red light emitting unit, so as to improve the luminous efficiency of red light; The light is transmitted through, and a color resist layer is correspondingly arranged for absorbing green light, and the second opening projects a corresponding green light emitting unit, so as to improve the luminous efficiency of green light.

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

In a specific example, the anti-reflection film 308 is an AR (Anti-Reflection) film, and the anti-reflection film 308 can be formed by chemical vapor deposition (PECVD). The required antireflection film 308 can be obtained by depositing the required amount of SiH ₄ , N ₂ O, and H ₂ for a set period of time.

In a specific example, the anti-reflection film 308 is disposed above the polarizing layer 305, and the design of the anti-reflection film 308 can further reduce the reflection of the display panel to ambient light.

As shown in FIGS. 12-15 , the specific structures of the anti-reflection films 308 included in several groups of OLED display panels are given for the embodiments of the present invention.

The first structure is that the display panel of FIG. 12 includes a stacked substrate 301, a light-emitting unit 302 formed in an array on the substrate, a 1/4λ retardation film 303, a semi-transparent and semi-reflective film 304, a polarizing layer 305, and a polarizing layer 305. Reverse film 308.

The second structure is that the display panel of FIG. 13 includes a stacked substrate 301, a light-emitting unit 302 formed in an array on the substrate, a black matrix layer 306, a 1/4λ retardation film 303, a transflective film 304, Polarizing layer 305 and anti-reflection film 308.

The third structure is that the display panel of FIG. 14 includes a stacked substrate 301, a light-emitting unit 302 formed in an array on the substrate, a color resist layer 307, a 1/4λ retardation film 303, a transflective film 304, Polarizing layer 305 and anti-reflection film 308.

The fourth structure is that the display panel of FIG. 15 includes a stacked substrate 301, an array of light-emitting units 302 formed on the substrate, a black matrix layer 306, a color resist layer 307, a 1/4λ retardation film 303, a semi-transparent layer Semi-reflective film 304, polarizing layer 305 and anti-reflective film 308.

It should be noted that, the anti-reflection film 308 can also be arranged between the polarizing beam splitting semi-transparent film 304 and the polarizing layer 305, or, it can be arranged on the polarizing beam-splitting semi-transparent film 304 and the 1/4λ retardation film 303 In the meantime, as long as the effect of further reducing the reflectivity of ambient light can be achieved, the specific position of the anti-reflection film 308 is not limited in this embodiment.

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 can be formed on the driving circuit layer by an evaporation method, and then encapsulated in the form of thin-film encapsulation (TFE for short) to form an encapsulation layer, wherein the encapsulation layer is shown in FIG. 5, In the drawings such as FIG. 8 , the film layer covering the light-emitting layer 302 is shown. Exemplarily, the encapsulation layer is located on the cathode of the display panel. Wherein, the encapsulation layer has at least three-layer structure, including an inorganic encapsulation layer and an organic encapsulation layer, the inorganic encapsulation layer is formed by deposition or the like, and the organic encapsulation layer is formed by inkjet printing. For example, the inorganic encapsulation layer may be formed of inorganic materials such as silicon nitride, silicon oxide, and silicon oxynitride, and the organic encapsulation layer may be formed of organic materials such as polyimide (PI) and epoxy resin. Thus, the inorganic encapsulation layer and the organic encapsulation layer are formed into a composite encapsulation layer, and the composite encapsulation layer can form multiple protections for the functional structure of the display area, and has a better encapsulation effect.

In a possible implementation manner, the display panel further includes a 1/2λ retardation film disposed between the 1/4λ retardation film 303 and the polarizing layer 305 , and the 1/2λ retardation film may also be It is arranged between the polarizing beam splitting type transflective film 304 and the polarizing layer 305. For example, the 1/2λ retardation film is a color adjustment layer, including a layer with a 1/2λ retardation layer. The layer is used for color correction to further reduce the reflection of the OLED display panel to external ambient light, and the 1/2λ retardation film will 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-mentioned embodiments, and its specific structure and beneficial effects can refer to the embodiments of the display panel, which will not be repeated here. The display device may be an electronic device with an image display function, such as a mobile phone, a tablet computer, a TV, etc., which will not be listed one by one here.

In the present invention, "on", "formed on" and "disposed on" can mean that one layer is directly formed or disposed on another layer, or it can mean that one layer is indirectly formed or disposed on. On another layer, ie there are other layers between the two layers.

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

In the present invention, unless otherwise specified, the term "same layer arrangement" is used to mean that two layers, parts, members, elements or sections may be formed by the same fabrication process (eg patterning process, etc.), and that the two The various layers, components, members, elements or sections are generally formed from the same material. For example, the arrangement of two or more functional layers in the same layer means that these functional layers arranged in the same layer can be formed by using the same material layer and using the same preparation process, so that the preparation process of the display substrate can be simplified.

In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, It is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention. Unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, It can also be an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or an internal connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

It should also be noted that, in the description of the present invention, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply these There is no such actual relationship or sequence between entities or operations. Moreover, the terms "comprising", "comprising" or any other variation thereof are intended to encompass a non-exclusive inclusion such that a process, method, article or device that includes a list of elements includes not only those elements, but also includes not explicitly listed or other elements inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element.

Obviously, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the embodiments of the present invention. Changes or changes in other different forms cannot be exhausted here, and all obvious changes or changes derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims (10)

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.

Images