Display panel and display device

Abstract

The embodiment of the present invention discloses 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 phase difference film, a semi-transparent semi-reflective film and a polarizing layer stacked on the substrate; the semi-transparent semi-reflective film is a polarization splitting semi-transparent semi-reflective film. This embodiment can improve the light transmittance of the display panel, enhance the display effect, and reduce the power consumption of the display panel.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and more specifically, to a display panel and a display device. Background Art

[0002] 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 external light by the display panel, resulting in low visibility. Therefore, a 1 / 4λ phase difference film and a polarizing layer are usually arranged in sequence on the light-emitting side of the display panel. At this time, the natural light (i.e., non-polarized light) emitted by the display panel is still natural light after passing through the 1 / 4λ phase difference film. After the natural light passes through the polarizing layer, the light with a vibration direction parallel to the transmission axis of the polarizing layer is transmitted, and the light with a vibration direction parallel to the absorption axis of the polarizing layer is absorbed by the polarizing layer. The transmittance of the light emitted by the display panel cannot exceed 50%, resulting in a low light output efficiency of the display panel. Summary of the invention

[0003] An object 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.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A first aspect of the present invention provides a display panel, comprising a substrate, and a light-emitting layer, a 1 / 4λ phase difference film, a semi-transparent semi-reflective film and a polarizing layer stacked on the substrate; the semi-transparent semi-reflective film is a polarization splitting semi-transparent semi-reflective film.

[0006] The display panel provided in the first aspect of the present invention can increase the light transmittance of the display panel, enhance the display effect, and reduce the power consumption of the display panel by adding a polarization-splitting semi-transparent and semi-reflective film between the 1 / 4λ phase difference film and the polarizing layer, which is used to transmit linearly polarized light with a first vibration direction and reflect linearly polarized light with a second vibration direction, and cooperate with the polarizing layer that transmits linearly polarized light in the first direction.

[0007] Optionally, the display panel also includes a black matrix layer arranged 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 the projection of each of the first openings on the substrate covers the projection of one of the light-emitting units on the substrate.

[0008] This optional method, by adding a black matrix layer for light absorption in the display panel, can absorb external ambient light incident on the display panel and reduce the display panel's reflection of ambient light. Thus, while adding a semi-transparent and semi-reflective film to improve the light output efficiency of the display panel, it can also compensate for a certain degree of negative impact of the semi-transparent and semi-reflective film on the reflection of ambient light.

[0009] Optionally, a projection area of ​​the first opening on the substrate is larger than a projection area of ​​the light emitting unit on the substrate.

[0010] 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.

[0011] Optionally, the black matrix layer is located between the 1 / 4λ phase difference film and the light-emitting layer.

[0012] This optional method can make the design process of the black matrix layer easier to implement.

[0013] 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 semi-transparent and semi-reflective film is a semi-transparent and semi-reflective film that is semi-transparent and semi-reflective to the first color light and transmits other color lights except the first color light, and the display panel also includes a color resist layer arranged on the side of the light-emitting layer away from the substrate, the color resist layer is used to absorb the first color light, the color resist layer has second openings arranged in an array, and the projection of each of the second openings on the substrate covers the projection of a first color light-emitting unit on the substrate.

[0014] This optional method, by adding a semi-transparent and semi-reflective film that is semi-transparent and semi-reflective to the first color light and transmits other color lights except the first color light, combined with a color resistance layer for absorbing the first color light with a second opening corresponding to the first color light-emitting unit, can improve the overall light output efficiency of the display panel by specifically improving the light output efficiency of the first color light while compensating for a certain degree of negative impact of the addition of the semi-transparent and semi-reflective film on the reflection of ambient light.

[0015] Optionally, a projection area of ​​the second opening on the substrate is larger than a projection area of ​​the first color light emitting unit on the substrate.

[0016] This optional method can ensure that the color resistance layer does not affect the light emission of the first color light emitting unit, thereby ensuring the light emission efficiency of the display panel.

[0017] Optionally, the first color is blue.

[0018] Since the light extraction efficiency of blue light is relatively low, this implementation method improves the overall light extraction efficiency of the display panel by specifically improving the light extraction efficiency of blue light.

[0019] Optionally, the color resistance layer is located between the 1 / 4λ phase difference film and the light-emitting layer.

[0020] Optionally, the display panel further comprises a reflection reduction film arranged on a side of the light emitting layer away from the substrate.

[0021] This optional approach can further reduce the reflection of ambient light by the display panel.

[0022] A second aspect of the present invention provides a display device, comprising the display panel as described in the first aspect of the present invention.

[0023] The beneficial effects of the present invention are as follows:

[0024] In view of the existing problems, the present invention provides a display panel and a display device. By adding a polarization splitting semi-transparent and semi-reflective film between a 1 / 4λ phase difference film and a polarizing layer for transmitting linearly polarized light with a first vibration direction and reflecting linearly polarized light with a second vibration direction, and cooperating with the polarizing layer for transmitting linearly polarized light in the first direction, the light transmittance of the display panel can be increased, the display effect can be improved, and the power consumption of the display panel can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0026] Figure 1 A schematic diagram showing the OLED panel reflecting external natural light in the related art.

[0027] Figure 2 A schematic diagram showing the structure of a linear polarizing layer combined with a 1 / 4λ phase difference film.

[0028] Figure 3 Show Figure 2 Schematic diagram of anti-reflection of a linear polarizing layer combined with a 1 / 4λ phase difference film.

[0029] Figure 4 Shows Figure 2 The schematic diagram of the light output path principle of the display device with a linear polarizing layer combined with a 1 / 4λ phase difference film is shown.

[0030] Figure 5 A schematic cross-sectional structure diagram of a display panel provided by an embodiment of the present invention is shown.

[0031] Figure 6 A schematic diagram showing how the light extraction efficiency of a display panel with a semi-transmissive and semi-reflective film is improved according to an embodiment of the present invention.

[0032] Figure 7 A schematic diagram showing the reflection of ambient light by a display panel with a semi-transmissive and semi-reflective film provided by an embodiment of the present invention is shown.

[0033] Figure 8 A schematic diagram showing another cross-sectional structure of a display panel provided by an embodiment of the present invention is shown.

[0034] Fig. 9 Show Figure 8 A schematic plan view of the display panel is shown.

[0035] Fig.10 A schematic diagram showing another cross-sectional structure of a display panel provided by an embodiment of the present invention is shown.

[0036] Fig.11 Show Fig.10 A schematic plan view of the display panel is shown.

[0037] Fig.12 A schematic diagram showing another cross-sectional structure of a display panel provided by an embodiment of the present invention is shown.

[0038] Fig.13 A schematic diagram showing another cross-sectional structure of a display panel provided by an embodiment of the present invention is shown.

[0039] Fig.14 A schematic diagram showing another cross-sectional structure of a display panel provided by an embodiment of the present invention is shown.

[0040] Fig.15 A schematic diagram showing another cross-sectional structure of a display panel provided by an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0041] In order to more clearly illustrate the present invention, the present invention is further described below in conjunction with the embodiments and the accompanying drawings. Similar components in the accompanying drawings are represented by the same reference numerals. It should be understood by those skilled in the art that the content specifically described below is illustrative rather than restrictive, and the protection scope of the present invention should not be limited thereto.

[0042] Organic light emitting diode (OLED) display panel, because the cathode of OLED display panel (for example, the material is Mg-Ag magnesium silver alloy) has a strong reflective effect, which leads to a decrease in contrast of OLED display panel under strong ambient light, and low outdoor visibility, such as Figure 1 As shown, the effect of the OLED display panel is affected.

[0043] Therefore, current OLED display panels usually have an anti-reflection layer including a 1 / 4λ phase difference film and a polarizing layer 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. Figure 2 As shown, a 1 / 4λ phase difference film 101 and a linear polarization layer 102 are sequentially stacked on the display panel. The principle of eliminating ambient light reflection of the display panel is as follows: Figure 3As shown: after the external ambient light passes through the linear polarizing layer 102 with, for example, an absorption axis in the vertical direction and a transmission axis in the horizontal direction, part of the ambient light with a vertical absorption axis (i.e., a polarization direction in the horizontal direction) can pass through, and the light with a polarization direction in the vertical direction is absorbed, that is, the natural light becomes an incident linear polarized light with a polarization direction in the horizontal direction. The incident linear polarized light with a polarization direction in the horizontal direction continues to move forward and passes through the 1 / 4λ phase difference film 101. The light is changed from, for example, an incident linear polarized light with a polarization direction in the horizontal direction to, for example, left-handed circularly polarized light. The left-handed circularly polarized light is reflected by the OLED display panel and rotates 180° to become right-handed circularly polarized light. After the right-handed circularly polarized light passes through the 1 / 4λ phase difference film 101 again, it becomes reflected linear polarized light, but the direction of the reflected linear polarized light this time is perpendicular to the direction of the incident linear polarized light that passes through the 1 / 4λ phase difference film for the first time, that is, it becomes reflected linear polarized light with a vertical polarization direction. The reflected linear polarized light with a vertical polarization 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 reflection of the external ambient light by the OLED display panel, ensuring the contrast of the OLED display panel itself, and allowing users to clearly see the screen content even under strong sunlight.

[0044] However, this design greatly reduces the light extraction efficiency of the display panel. Figure 4 As shown, the light path of the display panel is as follows: after the natural light emitted by the display panel passes through the 1 / 4λ phase difference film 101, the natural light emitted by the display panel can pass through, and no light in any vibration direction is absorbed. The natural light continues to move forward and passes through the linear polarizing layer 102. The light with a vibration direction perpendicular to the absorption axis of the linear polarizing layer 102, such as the vertical direction, can pass through, and the light with a vibration direction parallel to the absorption axis of the linear polarizing layer 102 is absorbed, that is, the natural light becomes an outgoing linear polarized light with a horizontal polarization direction. At this time, the natural light emitted by the panel is transformed from light in various vibration directions to only light perpendicular to the absorption axis direction of the linear polarizing layer 102, that is, light with a horizontal polarization 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. In actual situations, it is generally between 40% and 45%, resulting in a reduction in the light emission efficiency of the OLED display panel. If the human eye wants to see the intensity of the light emitted by the OLED display panel originally set, the display brightness of the OLED display panel must be increased, and the light emission brightness of the OLED display panel is improved at the cost of higher power consumption.

[0045] In view of this, an embodiment of the present invention provides a display panel, which may be an OLED display panel. Figure 5 As shown, the display panel provided by the embodiment of the present invention includes a substrate 301, and a light-emitting layer 302, a 1 / 4λ phase difference film 303, a semi-transparent semi-reflective film 304 and a polarizing layer 305 stacked on the substrate; the semi-transparent semi-reflective film 305 is a polarization splitting semi-transparent semi-reflective film.

[0046] The substrate 301 may be a glass substrate; the light-emitting layer 302 includes light-emitting units of various colors, and the light-emitting units are arranged in an array on the substrate 301 .

[0047] In a specific example, the polarization splitting semi-transmissive and semi-reflective film 304 is composed of a multilayer optical film, which is used to transmit linearly polarized light with a first polarization direction and reflect linearly polarized light with a second polarization direction, wherein the first direction, such as the horizontal direction, is orthogonal to the second direction, such as the vertical direction.

[0048] 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 to transmit linear polarized light with a polarization direction of a first direction, and absorb linear polarized light with a polarization direction of a second direction.

[0049] 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.

[0050] In a specific example, if Figure 6 As shown, the display panel provided by the embodiment of the present invention has at least the following beneficial effects:

[0051] Regarding the light emission of the display panel: after the light emitted from the light-emitting layer 302 in the display panel passes through the 1 / 4λ phase difference film 303, the natural light emitted from 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 move forward, passes through the polarization splitting semi-transparent and semi-reflective film 304, and transmits the light in the first polarization direction, such as the linear polarized light with a horizontal vibration direction, and reflects the light in the second polarization direction, such as the linear polarized light with a vertical vibration direction; the linear polarized light in the first polarization direction, such as the linear polarized light with a horizontal vibration direction, transmitted by the polarization splitting semi-transparent and semi-reflective film 304 continues to move forward, passes through the polarizing layer 305, and since the first polarization direction is parallel to the transmission axis of the polarizing layer 305, the linear polarized light in the first direction passes through the polarizing layer 305 to form a display The light emitted from the display panel; the second direction linear polarized light reflected by the polarization splitting semi-transparent and semi-reflective film 304 is reflected to the 1 / 4λ phase difference film 303, and becomes, for example, right-handed circularly polarized light. The right-handed circularly polarized light is reflected by the metal layer of the display panel, such as the cathode, and rotates 180° to become left-handed circularly polarized light. The left-handed circularly polarized light continues to move forward, and after passing through the 1 / 4λ phase difference film 303, it becomes the first direction linear polarized light. The first direction linear polarized light continues to move forward, and is transmitted through the polarization splitting semi-transparent and semi-reflective film 304, and is still the first direction linear polarized light. The first direction linear polarized light continues to move forward, and passes through the polarization layer 305. Since the first polarization direction is parallel to the transmission axis of the polarization layer 305, the first direction linear polarized light passes through the polarization layer 305 and becomes the light emitted from the display panel. Therefore, the polarization splitting semi-transparent and semi-reflective film 304 can improve the light transmittance of the display panel, enhance the display effect, and reduce the power consumption of the display panel.

[0052] However, in this embodiment, although the polarized light splitting semi-transmissive and semi-reflective film 304 can improve the light extraction efficiency of the display panel, it will have a certain degree of negative impact on the ambient light reflection reduction of the 1 / 4λ phase difference film 303 and the polarizing layer 305. Figure 7As shown, the specific optical path is: natural light in the environment illuminates the polarizing layer 305, and half of the light becomes, for example, linear polarized light with a first direction of vibration; the linear polarized light in the first direction passes through the polarization splitting semi-transparent and semi-reflective film 304 and remains as the linear polarized light in the first direction; the linear polarized light in the first direction passes through the 1 / 4λ phase difference film 303 and becomes, for example, left-handed circularly polarized light; the left-handed circularly polarized light is reflected by the display panel and rotates 108° to become right-handed circularly polarized light; the right-handed circularly polarized light passes through the 1 / 4λ phase difference film 303 and becomes linear polarized light in the second direction; the linear polarized light in the second direction is reflected by the polarization splitting semi-transparent and semi-reflective film 304 and remains as the linear polarized light in the second direction; The oscillating light is converted into, for example, right-handed circularly polarized light by the 1 / 4λ phase difference 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° to become left-handed circularly polarized light; the left-handed circularly polarized light is converted into first-direction linearly polarized light by the 1 / 4λ phase difference film 303; the first-direction linearly polarized light is still first-direction linearly polarized light by the polarization-splitting semi-transparent and semi-reflective film 304; the first-direction linearly polarized light is still first-direction linearly polarized light by the polarizing layer 305. Therefore, the OLED display panel provided in this embodiment will reflect a portion of the ambient light, but the reflection of this portion of the ambient light is relatively small and will not affect the use of the OLED display panel.

[0053] Furthermore, in order to improve the reflection of ambient light, in a possible implementation, in the display panel provided in this embodiment, as Figure 8 As shown, the display panel further includes a black matrix layer 306 disposed on a side of the light emitting layer away from the substrate 301 .

[0054] In a specific example, the black matrix layer 306 is located between the 1 / 4λ phase difference 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. In order not to affect the light-emitting display of the light-emitting units of multiple colors, the black matrix layer 306 has first openings arranged in an array, 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.

[0055] In a possible implementation manner, a projection area of ​​the first opening on the substrate 301 is larger than a projection area of ​​the light emitting unit on the substrate 301 .

[0056] This optional method can ensure that the black matrix layer 306 does not affect the light output of each light-emitting unit, thereby ensuring the light output efficiency of the display panel.

[0057] In a specific example, the polarization splitting semi-transparent and semi-reflective film 304 acts on the entire visible light band, that is, it is semi-transparent and semi-reflective for red light, green light and blue light. The light-emitting layer 302 includes light-emitting units of multiple colors arranged in an array, and the light-emitting units of multiple colors include red light-emitting units R (302), green light-emitting units G (302) and blue light-emitting units 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, and 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. Its plan view is as follows: Fig. 9 As shown, Fig. 9 In the figure, PDL 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 black matrix layer 306 will not block the red light emitting unit, the green light emitting unit and the blue light emitting unit, and the black matrix layer 306 will not absorb the light emitted by the OLED display panel. This design does not affect the light display of the red light emitting unit, the green light emitting unit and the blue light emitting unit, and enables the black matrix layer 306 to absorb the external ambient light incident to the inside of the display panel at the projection position other than the light emitting unit, and reduce the ambient light reflected back to the outside by the metal electrode in the display panel, that is, reduce the reflection of the display panel to the ambient light, so as to increase the semi-transparent and semi-reflective film 304 to improve the light emission efficiency of the display panel while compensating for a certain degree of negative impact of the addition of the semi-transparent and semi-reflective film 304 on the reflection of ambient light.

[0058] The design of the OLED display panel adding the polarization splitting semi-transparent and semi-reflective film 304 and the black matrix layer 306 has the same light emitting optical path principle as the above display panel only adding the polarization splitting semi-transparent and semi-reflective film 304, which will not be repeated here.

[0059] It should be noted that the black matrix layer 306 is located between the 1 / 4λ phase difference film 303 and the light-emitting layer 302 for easy process implementation. The black matrix layer 306 can also be set between the 1 / 4λ phase difference film 303 and the polarization-splitting semi-transparent and semi-reflective film 304, or between the polarization-splitting semi-transparent and semi-reflective film 304 and the polarizing layer 305. Alternatively, the black matrix layer 306 can also be set on the light-emitting layer 302 inside the display panel, for example, in the encapsulation layer. As long as the reflectivity of the display panel to ambient light can be reduced, the present invention does not limit the specific setting position of the black matrix layer 306.

[0060] In order to solve the problem of reflection of ambient light by the display panel caused by adding a semi-transparent and semi-reflective film on the basis of the existing display panel, in addition to adding a black matrix layer 306, the embodiment of the present invention can also provide another implementation method.

[0061] In another possible implementation, Fig.10 As shown, 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 semi-transparent and semi-reflective film 304 is a semi-transparent and semi-reflective film 304' that is semi-transparent and semi-reflective to the first color light and transmits other color lights except the first color light, and the display panel also includes a color resistance layer 307 arranged on the side of the light-emitting layer 302 away from the substrate 301, the color resistance layer 307 is used to absorb the first color light, and the color resistance layer 307 is provided with second openings arranged in an array, and the projection of each of the second openings on the substrate 301 covers the projection of a first color light-emitting unit on the substrate 301.

[0062] In a specific example, the polarization-splitting semi-transparent and semi-reflective film is composed of a multi-layer optical film. By matching the thickness and refractive index of each film layer, the polarization-splitting semi-transparent and semi-reflective film can be made semi-transparent and semi-reflective for light in some bands and fully transparent for light in other bands, that is, semi-transparent and semi-reflective for the first color light and transparent for light of other colors except the first color light.

[0063] In a possible implementation manner, the first color is blue.

[0064] For red light and green light, after adding the polarization splitting semi-transparent and semi-reflective film 304', since the polarization splitting semi-transparent and semi-reflective film 304' fully transmits the red light and the green light, the light path of the display panel is different from Figure 4The light emitting optical path principle of the linear polarizing layer combined with the 1 / 4λ phase difference film in the prior art shown is similar, that is, after the red light and green light emitted by the display panel pass through the 1 / 4λ phase difference film 303, the red light and green light emitted by the display panel can still pass through completely, and the red light and green light in any vibration direction are absorbed, and the red light and green light continue to move forward, and after passing through the polarization splitting semi-transparent and semi-reflective film 304', the red light and green light emitted by the display panel are all transmitted, and after passing 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, for example, 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 all absorbed. At this time, the red light and green light emitted by the panel are transformed from red light and green light in various vibration directions to red light and green light whose only polarization direction is perpendicular to the absorption axis direction, that is, the horizontal direction.

[0065] At the same time, the reflection of other bands of light in the ambient light except blue light will be eliminated. The principle is the same as Figure 3The anti-reflection principle of the mid-line polarizing layer combined with the 1 / 4λ phase difference film is similar, that is, after the red light and green light in the external environment pass through the polarizing layer 305 with, for example, an absorption axis in the vertical direction and a transmission axis in the horizontal direction, the red light and green light in the part of the environment perpendicular to the absorption axis (that is, the polarization direction is in the horizontal direction) can pass through, and the red light and green light with a polarization direction in the vertical direction are all absorbed, that is, the red light and green light in each polarization direction are converted into incident linear polarized red light and incident linear polarized green light with a polarization direction in the horizontal direction, and the red light and green light with a polarization direction in the horizontal direction are converted into incident linear polarized red light and incident linear polarized green light with a polarization direction in the horizontal direction. The incident linearly polarized red light and the incident linearly polarized green light continue to move forward and pass through the polarization splitting semi-transparent and semi-reflective film 304'. The polarization splitting semi-transparent and semi-reflective film 304' transmits the red light and the green light, and the incident linearly polarized red light and the incident linearly polarized green light with the polarization direction in the horizontal direction still pass through the 1 / 4λ phase difference film 303. The red light and the green light are changed from, for example, the incident linearly polarized red light and the incident linearly polarized green light with the polarization direction in the horizontal direction to, for example, left-handed circularly polarized red light and left-handed circularly polarized green light. The left-handed circularly polarized red light and the left-handed circularly polarized green light pass through After being reflected by the display panel, the right-handed circularly polarized red light and the right-handed circularly polarized green light are rotated 180° and become right-handed circularly polarized red light and right-handed circularly polarized green light. After the right-handed circularly polarized red light and the right-handed circularly polarized green light pass through the 1 / 4λ phase difference film 303 again, the right-handed circularly polarized red light and the right-handed circularly polarized green light become reflected linearly polarized red light and reflected linearly polarized green light. However, the directions of the reflected linearly polarized red light and the reflected linearly polarized green light are perpendicular to the directions of the incident linearly polarized red light and the incident linearly polarized green light that pass through the 1 / 4λ phase difference film 303 for the first time, that is, they become reverse polarization directions with the polarization directions being perpendicular. The ray-polarized red light and the reflected linear polarized green light, the reflected linear polarized red light and the reflected linear polarized green light with a vertical polarization direction pass through the polarization splitting semi-transparent and semi-reflective film 304', and are still the reflected linear polarized red light and the reflected linear polarized green light with a vertical polarization direction. After passing through the polarizing layer 305, the reflected linear polarized red light and the reflected linear polarized green light with a vertical polarization direction are parallel to the absorption axis of the polarizing layer 305, and are therefore absorbed by the polarizing layer 305, thereby eliminating the reflection of the red light and green light in the external environment by the OLED display panel.

[0066] For blue light, after adding the polarized light splitting semi-transparent and semi-reflective film 304', since the polarized light splitting semi-transparent and semi-reflective film 304' is semi-transparent and semi-reflective to blue light, the light path of the OLED display panel is different from that of the blue light. Figure 6The light output path of the display panel shown is consistent, that is, after the blue light emitted by the display panel passes through the 1 / 4λ phase difference film 303, the blue light emitted by the display panel can pass through, and the blue light without any vibration direction is absorbed, and the blue light continues to move forward, passes through the polarization splitting semi-transparent and semi-reflective film 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 polarization splitting semi-transparent and semi-reflective film 304' continues to move forward, passes through the polarizing layer 305, and since the blue light in the first polarization direction is parallel to the transmission axis of the polarizing layer 305, 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 in the second polarization direction reflected by the polarization splitting semi-transparent and semi-reflective film 304' is reflected to 1 / 4λ phase difference film 303, turns into, for example, right-handed circularly polarized blue light, which is reflected by the display panel and turned into left-handed circularly polarized blue light, which continues to move forward, and after passing through the 1 / 4λ phase difference film 303, turns into blue light with a first polarization direction, which continues to move forward, and is transmitted through the polarization splitting semi-transparent and semi-reflective film 304', and is still blue light with the first polarization direction, which continues to move forward, passes through the polarizing layer 305, and turns into blue light emitted by the display panel, that is, for the blue light, because the semi-transparent and semi-reflective film 304' that is semi-transparent and semi-reflective for the blue light is added, the light output efficiency of the blue light of the display panel is improved, and at the same time, the overall light output efficiency of the display panel is improved, and the power consumption of the display panel is reduced.

[0067] In addition, the semi-transparent and semi-reflective film 304' that is semi-transparent and semi-reflective to blue light will have a negative effect on the elimination of ambient light at other positions (including red light emitting units, green light emitting units and pixel definition layer positions) except for the blue light emitting unit, causing the OLED display panel to reflect a portion 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 the blue light in the ambient light, the display panel also includes a color resist layer 307 for absorbing blue light, such as Fig.10As shown, the color resist layer 307 is disposed between the display panel and the 1 / 4λ phase difference film 303. The display panel comprises a substrate 301, a light emitting layer 302 on the substrate, a color resist layer 307, a 1 / 4λ phase difference film 303, a semi-transmissive semi-reflective film 304' and a polarizing layer 305. The light emitting layer 302 comprises 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 luminous display of the blue light emitting unit B (302), the color resist layer 307 is provided with second openings arranged in an array at positions of the color resist layer 307 corresponding to the blue light emitting units. The projection of each of the second openings on the substrate 301 covers the projection of a blue light emitting unit B (302) on the substrate 301. In addition, this structure will cause a portion of the blue light in the ambient light to be reflected at the position of the blue light emitting unit B (302), which will further improve the blue light emitting efficiency by increasing the overall blue light output of the blue light emitting unit B (302).

[0068] In a possible implementation manner, a projection area of ​​the second opening on the substrate 301 is larger than a projection area of ​​the blue light emitting unit on the substrate 301 .

[0069] In a specific example, the polarization splitting semi-transparent and semi-reflective film 304' only acts on the blue light band, that is, it is semi-transparent and semi-reflective for blue light and fully transmits light of other bands. The light-emitting units 302 of multiple colors include red light-emitting units R (302), green light-emitting units G (302) and blue light-emitting units B (302). Since the color-resistance layer 307 is only used to absorb blue light and transmit red light and green light, the color-resistance layer 307 does not need openings at the corresponding positions of the red light-emitting units and the green light-emitting units, that is, the projection of the color-resistance layer 307 on the substrate covers the projection of the red light-emitting units R (302) and the green light-emitting units G (302) on the substrate, and the color-resistance layer 307 does not affect the light extraction efficiency of the red light and the green light. The color-resistance layer 307 has a second opening at the corresponding position of the blue light-emitting unit B (302). The projection area of ​​each of the second openings on the substrate 301 is larger than the projection area of ​​the blue light-emitting unit on the substrate 301. Its plan view is as shown in FIG. Fig.11 As shown, Fig.11In the figure, PDL is a pixel definition layer, CF is a color resist layer that absorbs blue light, and the second opening of the color resist layer CF is larger than the opening of the pixel definition layer PDL corresponding to the blue light emitting unit. Since the light extraction efficiency of red light and green light is higher and the light extraction efficiency of blue light is lower, the design of adding a polarized light splitting semi-transparent and semi-reflective film 304' that is semi-transparent and semi-reflective to blue light and transmits red light and green light improves the light extraction efficiency of blue light, and thus improves the overall light extraction efficiency of the OLED display panel; at the same time, the design of adding a color resist layer 307 that absorbs blue light can also enable the color resist layer 307 to absorb the ambient light incident to the inside of the display panel from the projection position other than the blue light emitting unit The blue light component in the light is reduced, thereby reducing its reflection back to the outside by the metal electrode in the display panel, that is, reducing the reflection of the blue light in the ambient light at the projection position of the display panel other than the blue light emitting unit, thereby increasing the polarization splitting semi-transparent and semi-reflective film 304' which is semi-transparent and semi-reflective to blue light and transmits red light and green light, and making a part of the blue light in the ambient light reflected at the position of the blue light emitting unit B (302) 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 reflection of the blue light in the ambient light at the projection position other than the blue light emitting unit.

[0070] It should be noted that, in the embodiments of the present invention, a polarized beam splitting semi-transparent and semi-reflective film can be arranged to be semi-transparent and semi-reflective to red light and to transmit light of other wavelengths except red light, and a color blocking layer can be arranged accordingly to absorb red light and the projection of the second opening corresponds to the red light emitting unit, so as to improve the luminous efficiency of red light; or, a polarized beam splitting semi-transparent and semi-reflective film can be arranged to be semi-transparent and semi-reflective to green light and to transmit light of other wavelengths except green light, and a color blocking layer can be arranged accordingly to absorb green light and the projection of the second opening corresponds to the green light emitting unit, so as to improve the luminous efficiency of green light.

[0071] In a possible implementation, the display panel further includes a reflection reduction film 308 disposed on a side of the light emitting layer 302 away from the substrate.

[0072] 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), specifically: under set pressure and power, a set amount of SiH4, N2O, and H2 is introduced, and the required anti-reflection film 308 can be obtained by depositing for a set time period.

[0073] In a specific example, the anti-reflection film 308 is disposed above the polarizing layer 305 . The design of the anti-reflection film 308 can further reduce the reflection of the display panel to the ambient light.

[0074] like Figure 12-15 As shown, several groups of specific structures including the anti-reflection film 308 in the OLED display panel are provided for the embodiment of the present invention.

[0075] Structure 1 is, Fig.12 The display panel includes a stacked substrate 301 , light emitting units 302 arranged in an array on the substrate, a 1 / 4λ phase difference film 303 , a semi-transmissive and semi-reflective film 304 , a polarizing layer 305 and a reflection reduction film 308 .

[0076] Structure 2 is: Fig.13 The display panel includes a stacked substrate 301 , light emitting units 302 arranged in an array on the substrate, a black matrix layer 306 , a 1 / 4λ phase difference film 303 , a semi-transmissive and semi-reflective film 304 , a polarizing layer 305 and a reflection reduction film 308 .

[0077] Structure three is: Fig.14 The display panel includes a stacked substrate 301 , light emitting units 302 arranged in an array on the substrate, a color resist layer 307 , a 1 / 4λ phase difference film 303 , a semi-transmissive and semi-reflective film 304 , a polarizing layer 305 and a reflection reduction film 308 .

[0078] Structure 4 is: Fig.15 The display panel includes a stacked substrate 301, light emitting units 302 arranged in an array on the substrate, a black matrix layer 306, a color resist layer 307, a 1 / 4λ phase difference film 303, a semi-transmissive and semi-reflective film 304, a polarizing layer 305 and a reflection reduction film 308.

[0079] It should be noted that the anti-reflection film 308 can also be set between the polarization-splitting semi-transparent and semi-reflective film 304 and the polarizing layer 305, or between the polarization-splitting semi-transparent and semi-reflective film 304 and the 1 / 4λ phase difference film 303. 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.

[0080] In a specific example, the OLED display panel further includes other functional film layers such as a buffer layer, a driving circuit layer, and an encapsulation layer disposed on the substrate 301. For example, the light-emitting layer 302 can be formed on the driving circuit layer by evaporation, and then encapsulated in the form of thin-film encapsulation (TFE) to form an encapsulation layer, wherein the encapsulation layer is, for example, Figure 5 , Figure 8The film layer covering the light-emitting layer 302 in the accompanying drawings. Exemplarily, the encapsulation layer is located on the cathode of the display panel. Wherein, the encapsulation layer has at least a 3-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 can be formed of inorganic materials such as silicon nitride, silicon oxide, and silicon oxynitride, and the organic encapsulation layer can be formed of organic materials such as polyimide (PI) and epoxy resin. Thus, the inorganic encapsulation layer and the organic encapsulation layer form a composite encapsulation layer, which can form multiple protections for the functional structure of the display area and has a better encapsulation effect.

[0081] In a possible implementation, the display panel also includes a 1 / 2λ phase difference film arranged between the 1 / 4λ phase difference film 303 and the polarizing layer 305. The 1 / 2λ phase difference film can also be arranged between the polarization splitting semi-transparent and semi-reflective film 304 and the polarizing layer 305. For example, the 1 / 2λ phase difference film is a color adjustment layer, which includes a layer with a 1 / 2λ phase difference layer. The color adjustment layer is used for color correction to further reduce the reflection of the OLED display panel to the external ambient light. The 1 / 2λ phase difference film will not affect the light transmittance of the final OLED display panel.

[0082] Another embodiment of the present invention provides a display device, which may include the display panel of any of the above embodiments. The specific structure and beneficial effects thereof may refer to the embodiments of the display panel, which will not be described in detail here. 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 will not be listed one by one here.

[0083] The terms “on”, “formed on” and “disposed on” in the present invention may mean that one layer is directly formed or disposed on another layer, or may mean that one layer is indirectly formed or disposed on another layer, i.e., there are other layers between the two layers.

[0084] It should be noted that, although the terms "first", "second", etc. may be used herein to describe various parts, components, elements, regions, layers and / or parts, these parts, components, elements, regions, layers and / or parts should not be limited by these terms. Instead, these terms are used to distinguish one part, component, element, region, layer and / or part from another. Thus, for example, the first part, first member, first element, first region, first layer and / or first part discussed below may be referred to as the second part, second member, second element, second region, second layer and / or second part without departing from the teachings of the present invention.

[0085] In the present invention, unless otherwise specified, the term "same-layer arrangement" used means that two layers, parts, components, elements or parts can be formed by the same preparation process (such as patterning process, etc.), and the two layers, parts, components, elements or parts are generally formed of the same material. For example, two or more functional layers are arranged in the same layer, which means that these functional layers arranged in the same layer can be formed using the same material layer and the same preparation process, thereby simplifying the preparation process of the display substrate.

[0086] In the description of the present invention, it should be noted that the terms "upper", "lower", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0087] 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 any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0088] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the embodiments here. All obvious changes or modifications derived from the technical solution of the present invention are still within the protection scope of the present invention.

Claims

1. A display panel, characterized in that: It comprises a substrate, and a light-emitting layer, a 1 / 4λ phase difference film, a semi-transmissive semi-reflective film and a polarizing layer stacked on the substrate; the semi-transmissive semi-reflective film is a polarization splitting semi-transmissive semi-reflective film, and the light-emitting layer comprises light-emitting units arranged in an array; 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 semi-transparent and semi-reflective film is a semi-transparent and semi-reflective film that is semi-transparent and semi-reflective to the first color light and transmits other color lights except the first color light. The display panel also includes a color resist layer arranged on the side of the light-emitting layer away from the substrate, the color resist layer is used to absorb the first color light, and the color resist layer is provided with second openings arranged in an array, and the projection of each of the second openings on the substrate covers the projection of a first color light-emitting unit on the substrate.

2. The display panel according to claim 1, characterized in that: The display panel further includes a black matrix layer disposed on a side of the light-emitting layer away from the substrate, the black matrix layer having first openings arranged in an array, and a projection of each of the first openings on the substrate covers a projection of a light-emitting unit on the substrate.

3. The display panel according to claim 2, characterized in that: A projection area of ​​the first opening on the substrate is larger than a projection area of ​​the light emitting unit on the substrate.

4. The display panel according to claim 2, characterized in that: The black matrix layer is located between the 1 / 4λ phase difference film and the light emitting layer.

5. The display panel according to claim 1, characterized in that: A projection area of ​​the second opening on the substrate is larger than a projection area of ​​the first color light emitting unit on the substrate.

6. The display panel according to claim 1, characterized in that: The first color is blue.

7. The display panel according to claim 1, characterized in that: The color resistance layer is located between the 1 / 4λ phase difference film and the light emitting layer.

8. The display panel according to claim 1, characterized in that: The display panel further includes a reflection reduction film disposed on a side of the light emitting layer away from the substrate.

9. A display device, comprising the display panel according to any one of claims 1 to 8.

Images