Display panel and display apparatus

Abstract

The present disclosure relates to the technical field of display, and provides a display panel and a display apparatus aiming to improve the display quality of top-emitting devices. The display panel comprises: a substrate comprising a plurality of pixel regions; a plurality of monochromatic light-emitting devices located on a side of the substrate, wherein each pixel region comprises a plurality of monochromatic light-emitting devices corresponding to different colors; and an optical control layer, located on a side of the monochromatic light-emitting devices away from the substrate and / or adjacent to the substrate, the optical control layer comprising a plurality of optical control regions, and an orthographic projection of each optical control region on the substrate overlapping with an orthographic projection of one monochromatic light-emitting device on the substrate, wherein optical control regions overlapping with monochromatic light-emitting devices corresponding to different colors have different thicknesses.

Description

Display panel and display device

[0001] This disclosure claims priority to Chinese Patent Application No. 202411203364.X, filed on August 28, 2024, entitled “Display Panel and Display Device”, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure relates to the field of display technology, and in particular to a display panel and a display device. Background Technology

[0003] Organic light-emitting diodes (OLEDs) possess advantages such as self-illumination, wide viewing angle, high contrast, fast response time, and flexible display, making them one of the most watched technologies in flat panel display technology. With the development of OLEDs, white OLED devices, also known as WOLED devices, have emerged. A pixel in a white OLED typically comprises four sub-pixels: a white-emitting sub-pixel, a green-emitting sub-pixel, a blue-emitting sub-pixel, and a red-emitting sub-pixel.

[0004] Overview

[0005] Based on the background art, this disclosure proposes a display panel and a display device.

[0006] A first aspect of this disclosure provides a display panel, comprising:

[0007] The substrate includes multiple pixel regions;

[0008] Multiple monochromatic light-emitting devices are located on one side of the substrate, and one pixel region includes multiple monochromatic light-emitting devices corresponding to different colors; and,

[0009] An optical control layer is located on the side of the monochromatic light-emitting device facing away from and / or close to the substrate. The optical control layer includes a plurality of optical control regions, wherein the orthographic projection of one of the optical control regions on the substrate overlaps with the orthographic projection of one of the monochromatic light-emitting devices on the substrate.

[0010] The optical control regions that overlap with the monochromatic light-emitting devices corresponding to different colors have different thicknesses.

[0011] For example, one of the pixel regions includes a first monochromatic light-emitting device corresponding to white light, and a plurality of second monochromatic light-emitting devices corresponding to different colored lights;

[0012] The orthographic projection of the optical control area on the substrate overlaps with the orthographic projection of the second monochromatic light-emitting device on the substrate, but does not overlap with the orthographic projection of the first monochromatic light-emitting device on the substrate.

[0013] For example, the plurality of optical control regions include a first optical control region and a second optical control region;

[0014] Wherein, the thickness of the first optical control region is greater than the thickness of the second optical control region, and the wavelength of the color corresponding to the monochromatic light-emitting device overlapping with the first optical control region is greater than the wavelength of the color corresponding to the monochromatic light-emitting device overlapping with the second optical control region.

[0015] For example, the monochromatic light-emitting device includes an anode layer, an organic light-emitting layer, and a cathode layer sequentially disposed in the thickness direction of the substrate; at least one insulating film layer is also included on the side of the monochromatic light-emitting device facing away from the substrate 11; wherein, the sum of the optical path length of the optical control region, the optical path length of the organic light-emitting layer, the optical path length of the cathode layer, and the optical path length of the insulating film layer is equal to m optical cycles corresponding to the monochromatic light-emitting device that overlaps with the optical control region;

[0016] The optical period is determined based on the wavelength of the emitted color of the monochromatic light-emitting device and the refractive index of the organic light-emitting layer, and m is a positive integer greater than or equal to 1.

[0017] For example, the optical path length of the optical control region is less than one optical cycle.

[0018] For example, the display panel further includes a relationship in which the optical path lengths of the insulating film layer, the optical path length of the optical control region, the optical path lengths of the organic light-emitting layer, and the optical path lengths of the cathode layer satisfy the following:

[0019] n4L4=A+m*(λ / 2)-n1*L1-n2*L2-n3*L3;

[0020] Wherein, n4 is the refractive index of the optical control layer, L4 is the thickness of the optical control region, λ is the wavelength, n1 is the refractive index of the organic light-emitting layer, L1 is the thickness of the organic light-emitting layer, n2 is the refractive index of the cathode layer, L2 is the thickness of the cathode layer, n3 is the refractive index of the insulating film layer, and L3 is the thickness of the insulating film layer.

[0021] For example, the optical control layer includes a first optical control layer located on the side of the monochromatic light-emitting device facing away from the substrate;

[0022] The display panel further includes:

[0023] A planarization layer is located on the side of the first optical control layer that faces away from the substrate;

[0024] A color resist layer is located on the side of the planarization layer opposite to the substrate.

[0025] For example, the planarization layer includes a plurality of protrusions that protrude toward the first optical control layer;

[0026] The optical control area in the first optical control layer is located on the side of the protrusion away from the color resist layer.

[0027] For example, the display panel also includes:

[0028] A reflective metal layer is located on the side of the second optical control layer closer to the substrate;

[0029] The optical control layer includes a second optical control layer, which is located between the monochromatic light-emitting device and the reflective metal layer.

[0030] For example, the display panel further includes:

[0031] A pixel defining layer, located on one side of the substrate, includes multiple opening regions, and multiple monochromatic light-emitting devices are respectively located within the multiple opening regions;

[0032] In this embodiment, the plurality of optical control regions in the second optical control layer are respectively located within the plurality of opening regions.

[0033] For example, one of the pixel regions includes a first monochromatic light-emitting device corresponding to white light, and a plurality of second monochromatic light-emitting devices corresponding to different colored lights; the display panel further includes:

[0034] A color resist layer is located on the side of the monochromatic light-emitting device facing away from the substrate, and on the side of the optical control layer facing away from the substrate. The color resist layer includes multiple color filter areas corresponding to multiple second monochromatic light-emitting devices respectively.

[0035] Wherein, the orthographic projection of the color filter area on the substrate overlaps with the orthographic projection of the monochromatic light-emitting device on the substrate, and the orthographic projection of the optical control area on the substrate overlaps with the orthographic projection of the color filter area on the substrate.

[0036] For example, the optical control layer includes a plurality of sub-control layers stacked sequentially in the thickness direction of the substrate, wherein each pair of adjacent sub-control layers has a different refractive index.

[0037] For example, the optical control layer includes a first optical control layer located on the side of the monochromatic light-emitting device facing away from the substrate;

[0038] The display panel also includes:

[0039] An encapsulation layer is located between the monochromatic light-emitting device and the first optical control layer;

[0040] The refractive index of the first optical control layer is different from that of the encapsulation layer.

[0041] For example, the optical control layer includes a transparent material, which includes any one of ITO, IZO, IGZO, SiOx, and SiNx.

[0042] For example, the display panel includes an array substrate and a color filter substrate that is paired with the array substrate, wherein the substrate and a plurality of the monochromatic light-emitting devices are located on the array substrate;

[0043] The optical control layer is located on the side of the color filter substrate closer to the array substrate, and / or on the array substrate.

[0044] For example, the optical control layer is located on the array substrate and includes a second optical control layer located on the side of the monochromatic light-emitting device closer to the substrate.

[0045] For example, the multiple monochromatic light-emitting devices have the same thickness.

[0046] In a second aspect, a display device is provided, comprising the display panel described in any embodiment of the first aspect.

[0047] The display panel in this embodiment includes a substrate, multiple monochromatic light-emitting devices, and an optical control layer. The substrate includes multiple pixel regions, and each pixel region contains multiple monochromatic light-emitting devices corresponding to different colors. The optical control layer is located on the side of the monochromatic light-emitting devices facing away from and / or close to the substrate. It includes multiple optical control areas, and the orthographic projection of one optical control area onto the substrate overlaps with the orthographic projection of one monochromatic light-emitting device onto the substrate. The optical control areas corresponding to different colors of monochromatic light-emitting devices have different thicknesses. This display panel can adjust the optical film thickness corresponding to different monochromatic light-emitting devices by adding an optical control layer, such as adjusting it to the optimal optical film thickness that facilitates light emission. This helps to improve the luminous efficiency of the R / G / B monochromatic light-emitting devices and achieve optimal light emission.

[0048] The above description is merely an overview of the technical solution disclosed herein. In order to better understand the technical means of this disclosure and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this disclosure more apparent and understandable, specific embodiments of this disclosure are described below.

[0049] Brief description of the attached diagram

[0050] To more clearly illustrate the technical solutions in the embodiments or related technologies of this disclosure, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. It should be noted that the scale in the drawings is for illustration only and does not represent the actual scale.

[0051] Figure 1 shows a schematic diagram of the three-layer structure in an embodiment of this disclosure;

[0052] Figure 2 shows a schematic cross-sectional view of a display panel in the related art;

[0053] Figure 3 shows a top view of the display panel in this embodiment;

[0054] Figures 4, 5 and 6 show the cross-sectional structural diagrams of the three display panels in this embodiment;

[0055] Figure 7 shows a detailed schematic diagram of region BB in Figure 4;

[0056] Figures 8 and 9 show cross-sectional structural diagrams of two different display panels, respectively;

[0057] Figure 10 shows several cross-sectional structural diagrams of an optical control layer;

[0058] Figure 11 shows a schematic cross-sectional view of the monochromatic light-emitting device;

[0059] Figure 12 shows a schematic diagram of the film thickness setting for the monochromatic light-emitting device in Figure 11.

[0060] Reference numerals: AA: Display area; NA: Non-display area; 11: Substrate; 12: Pixel area; 13: Monochrome light-emitting device; 14: Encapsulation layer; 15: Reflective metal layer; 16: Pixel boundary layer; 21: Encapsulation cover plate; 22: Black matrix layer; 23: Color resist layer; 24: Planarization layer; 30: Optical control layer; 31: First optical control layer; 32: Second optical control layer; 131: Anode layer; 132: Organic light-emitting layer; 133: Cathode layer; 301: First sub-control layer; 302: Second sub-control layer; 303: Third sub-control layer; 304: Fourth sub-control layer; 31a: First optical control area; 31b: Second optical control area.

[0061] Detailed description

[0062] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0063] In related technologies, the light-emitting layer of the light-emitting device in a WOLED device is a key component of WOLED.

[0064] Its light-emitting layer typically uses a mixture of red, green, and blue light-emitting materials, and needs to have high brightness and long lifespan. WOLED devices generally use OLED light-emitting points that emit cool white light, combined with RGB three-color filters on the color filter substrate to emit the three primary colors, while retaining a portion of white light-emitting material. The white light is mainly used to improve display brightness. Therefore, WOLED devices have high display brightness.

[0065] For WOLED devices, to ensure the intensity of blue light, the sub-pixels in WOLED devices generally adopt a triple-layer structure. Referring to Figure 1, a schematic diagram of this triple-layer structure is shown. As shown in Figure 1, it includes: a total reflection anode layer, an A-color emitting layer, a B-color emitting layer, another A-color emitting layer, and a semi-transparent cathode. The light-emitting device shown in Figure 1 can be called an RY device. A and B colors can be set as needed, such as blue, green, or red. In practical use, one pixel includes four light-emitting devices as shown in Figure 1. The four light-emitting devices emit the three primary colors through corresponding three-color filters on the color filter substrate. For example, referring to Figure 2, a schematic cross-sectional structure of a display panel in the related art is shown. As shown in Figure 2, the color filter substrate includes a color filter layer, which includes filters corresponding to the R / G / B sub-pixels on the array substrate, so that the light emitted by the RY light-emitting devices at the R / G / B sub-pixels is color-adjusted by the filters and finally emits the three primary colors R / G / B.

[0066] Thus, because the light-emitting device mixes red, green and blue light-emitting materials, it is impossible to simultaneously guarantee that red and green are optimal. At the same time, the mutual interference between the light-emitting devices makes it difficult to guarantee that each color is optimal. Specifically, the optimality can refer to whether the brightness and the emitted color are optimal.

[0067] In view of this, in order to achieve the optimal light output efficiency of the R / G / B monochromatic device, the inventors proposed that the optical film thickness of each light-emitting device can be adjusted by adding an optical control layer 30, so that the light output of the R / G / B monochromatic device can be optimized.

[0068] Referring to Figures 3-5, Figure 3 shows a top view of the display panel in this embodiment, and Figures 4 and 5 show cross-sectional structural diagrams of the two types of display panels in this embodiment, respectively. As shown in Figures 3-5, the display panel in this embodiment mainly includes:

[0069] Substrate 11 includes multiple pixel regions 1212;

[0070] Multiple monochromatic light-emitting devices 13 are located on one side of the substrate 11, and a pixel area 1212 includes multiple monochromatic light-emitting devices 13 corresponding to different colors; and,

[0071] The optical control layer 30 is located on the side of the monochromatic light-emitting device 13 away from and / or close to the substrate 11. The optical control layer 30 includes a plurality of optical control regions 31 / 32, and the orthographic projection of one optical control region 31 / 32 on the substrate 11 overlaps with the orthographic projection of one monochromatic light-emitting device on the substrate 11.

[0072] Among them, the optical control areas 31 / 32, which overlap with the monochromatic light-emitting devices of different colors, have different thicknesses.

[0073] In this embodiment, the display panel can be an OLED display panel or a WOLED display panel. That is to say, the optical control layer 30 proposed in this embodiment, and the structure of the optical control layer 30 that can adjust the optical film thickness of each monochromatic light-emitting device, can be applied not only to WOLED display panels to optimize the light output of each individual light-emitting device, but also to OLED display panels to optimize the light output of each color light-emitting device, such as optimizing the light output of red, green and blue light-emitting devices.

[0074] In this embodiment, the substrate 11 can be a transparent substrate 11, specifically, it can be a flexible substrate 11 or a non-flexible substrate 11. If it is a flexible substrate 11, it can be a silicon-based substrate 11. If it is a non-flexible substrate 11, it can be a glass substrate 11.

[0075] As shown in Figure 3, the substrate 11 includes a display area AA and a non-display area NA. Specifically, the substrate 11 is divided into a display area AA and a non-display area NA. The non-display area NA may be located at the edge of the display area AA, such as surrounding the display area AA, or partially surrounding the display area AA.

[0076] The display area AA includes multiple pixel areas 12, which can be arranged in an array. Each pixel area 12 can include multiple sub-pixel areas, and each sub-pixel area can have one sub-pixel. Specifically, if the display panel is a WOLED display panel, one pixel area 12 can include four sub-pixel areas, meaning one pixel includes four sub-pixels: a white sub-pixel, a green sub-pixel, a blue sub-pixel, and a red sub-pixel. If the display panel is an OLED display panel, one pixel area 12 can include three sub-pixel areas, meaning one pixel includes three sub-pixels: a green sub-pixel, a blue sub-pixel, and a red sub-pixel.

[0077] In this embodiment, a plurality of monochromatic light-emitting devices are also included on one side of the substrate 11. A pixel area 12 may include a plurality of monochromatic light-emitting devices corresponding to different colors. Each monochromatic light-emitting device can be understood as a sub-pixel of a pixel. In a WOLED display panel, a pixel area 12 may include four monochromatic light-emitting devices corresponding to different colors. In an OLED display panel, a pixel area 12 may include three monochromatic light-emitting devices corresponding to different colors.

[0078] In this embodiment, as shown in Figures 4 and 5, the monochromatic light-emitting device may include an anode layer 131, a cathode layer 133, and an organic light-emitting layer 132 located between the anode layer 131 and the cathode layer 133. The organic light-emitting layer 132 may adopt a triple-layer structure as shown in Figure 1, so that the display panel is a WOLED display panel. Alternatively, the organic light-emitting layer 132 may adopt a non-triple-layer structure, such as the organic light-emitting layer 132 including a light-emitting layer, such as a blue phosphor layer, a green phosphor layer, or a red phosphor layer, so that the display panel is an OLED display panel.

[0079] In this embodiment, a plurality of thin-film transistors are also disposed on the substrate 11. The thin-film transistors include a gate, a gate insulating layer, a source, and a drain. The drain can be connected to the anode layer. Specifically, the display panel can be a top-emitting display panel. In the top-emitting display panel, the light emitted by the monochromatic light-emitting device is emitted from the cathode layer side, that is, the light is emitted from the side of the thin-film transistor away from the substrate 11.

[0080] In some embodiments, a monochromatic light-emitting device may be a series-connected light-emitting device, which may include multiple light-emitting layers arranged in series.

[0081] In this embodiment, in the WOLED display panel, "corresponding to different colors" in multiple monochrome light-emitting devices corresponding to different colors can refer to the final emitted color of the monochrome light-emitting device. For example, if the final emitted color of the monochrome light-emitting device is green, it is called a monochrome light-emitting device corresponding to green. It does not specifically refer to the emitted color of the monochrome light-emitting device itself.

[0082] In this embodiment, an optical control layer 30 is also included. As shown in FIG4, the optical control layer 30 (hereinafter referred to as the first optical control layer 31) can be provided on the side of the monochromatic light-emitting device away from the substrate 11. Alternatively, as shown in FIG5, the optical control layer 30 (hereinafter referred to as the second optical control layer 32) can be provided on the side of the monochromatic light-emitting device close to the substrate 11. Or, as shown in FIG6, the optical control layer 30 (including the first optical control layer 31 and the second optical control layer 32) can be provided on both the side of the monochromatic light-emitting device close to the substrate 11 and the side away from the substrate 11.

[0083] As shown in Figure 4, the first optical control layer 31 can be located on the side of the cathode layer of the monochromatic light-emitting device away from the substrate 11. As shown in Figure 5, the second optical control layer 32 can be located on the side of the anode layer of the monochromatic light-emitting device close to the substrate 11.

[0084] The optical control layer 30 may include multiple optical control regions (including 31a / 31b), which may be spaced apart and each optical control region corresponds to a multiple monochromatic light-emitting device. Specifically, the orthographic projection of an optical control region on the substrate 11 may overlap with the orthographic projection of a monochromatic light-emitting device on the substrate 11. This overlap may include any of the following: the orthographic projection of the optical control region on the substrate 11 covers the orthographic projection of the monochromatic light-emitting device on the substrate 11; the orthographic projection of the optical control region on the substrate 11 falls within the orthographic projection of the monochromatic light-emitting device on the substrate 11; or the orthographic projection of the optical control region on the substrate 11 partially coincides with the orthographic projection of the monochromatic light-emitting device on the substrate 11.

[0085] In this embodiment, the optical control regions overlapping with monochromatic light-emitting devices of different colors can have different thicknesses. Thus, the thickness of the entire optical control layer 30 is not uniform; that is, the thickness of the optical control layer 30 varies in different sub-pixel regions. For example, multiple monochromatic light-emitting devices in the same pixel region 12 can correspond to optical control regions of different thicknesses. The thickness of the optical control region can refer to its dimension in the normal direction of the substrate 11.

[0086] Of course, for monochromatic light-emitting devices of the same color in different pixel areas 12, these monochromatic light-emitting devices of the same color can correspond to optical control areas of the same thickness. For example, in the entire display panel, multiple monochromatic light-emitting devices corresponding to blue light correspond to optical control areas of the same thickness, multiple monochromatic light-emitting devices corresponding to green light correspond to optical control areas of the same thickness, and multiple monochromatic light-emitting devices corresponding to red light correspond to optical control areas of the same thickness.

[0087] Specifically, multiple monochromatic light-emitting devices in a pixel area 12 correspond to different emitted light colors. Different emitted light colors have different wavelengths. In practice, the thickness of the optical control area can be adjusted according to the wavelength of the emitted light color of the monochromatic light-emitting device to make the monochromatic light-emitting device have the optimal optical film thickness. The optical film thickness can refer to the optical distance between the light emitted by the monochromatic light-emitting device inside the display panel and the light-emitting surface. It includes the distance between the light emitted by the light-emitting point of the monochromatic light-emitting device directly hitting the light-emitting surface and the distance between the light emitted by the light-emitting point of the monochromatic light-emitting device incident on the substrate 11 and reflected back to the light-emitting surface by the substrate 11.

[0088] In some embodiments, the thickness of the optical control region of each monochromatic light-emitting device can optimize the optical film thickness of the monochromatic light-emitting device. Under the optimal optical film thickness, the luminous brightness of the monochromatic light-emitting device can be improved, and the luminous color can be made purer.

[0089] In practice, optical film thickness can be measured by the optical period of the emitted color of a monochromatic light-emitting device. The optical period characterizes the minimum distance between the emission point and the point of highest brightness (e.g., a peak) during the emission process of light emitted by a monochromatic light-emitting device. For example, the brightness of light emitted by a monochromatic light-emitting device reaches its maximum when it travels from emission point S1 to point S2 (peak, not shown in the figure). The distance between S1 and S2 is one optical period. In practice, based on the wave-particle duality of light, there will be multiple points of highest brightness during the emission process, such as multiple S2 points. Thus, one optical period can refer to the distance between emission point S1 and the first point S2.

[0090] In this way, the optical film thickness of the monochromatic light-emitting device can correspond to the optical period, and its optical film thickness in practice...

[0091] In this embodiment, the optical period is related to the wavelength of the emitted light color and the refractive index of the film layer that the light from the monochromatic light-emitting device must pass through in the path toward the light-emitting surface.

[0092] For example, the optical period can be referred to by the following formula (1): H=λ / 2n Formula (1);

[0093] In formula (1), n ​​is the refractive index of the film layers that the light from the monochromatic light-emitting device passes through in the path towards the light-emitting surface, λ is the wavelength of the emitted light color, and H is the optical period. For example, as shown in Figure 4, the light from the monochromatic light-emitting device passes through the organic light-emitting layer 132, the cathode layer 133, and the encapsulation layer 14 during the light emission process. Therefore, n includes the refractive index of the organic light-emitting layer 132, the refractive index of the cathode layer 133, and the refractive index of the encapsulation layer 14.

[0094] The display panel using this embodiment can adjust the optical film thickness corresponding to different monochromatic light-emitting devices by adding an optical control layer 30. For example, it can be adjusted to the optimal optical film thickness that is conducive to light emission. This can help improve the luminous efficiency of R / G / B monochromatic light-emitting devices and achieve optimal light emission.

[0095] In some embodiments, the display panel may be a WOLED display panel, and a pixel area 12 may include a first monochromatic light-emitting device corresponding to white light and a plurality of second monochromatic light-emitting devices corresponding to different colored lights; accordingly, the orthographic projection of the optical control area on the substrate 11 may overlap with the orthographic projection of the second monochromatic light-emitting device on the substrate 11, but may not overlap with the orthographic projection of the first monochromatic light-emitting device on the substrate 11.

[0096] In this embodiment, for the WOLED display panel, the structure of each monochrome light-emitting device can be consistent, such as all being RY monochrome light-emitting devices. A pixel area 12 includes four monochrome light-emitting devices. Among them, the monochrome light-emitting device that emits white light is called the first monochrome light-emitting device, and the monochrome light-emitting device that emits colored light is called the second monochrome light-emitting device. For example, it can include a second monochrome light-emitting device that emits blue light, a second monochrome light-emitting device that emits green light, and a second monochrome light-emitting device that emits red light.

[0097] An optical control area can be set for the second monochromatic light-emitting device. For example, referring to Figures 4 and 5, an optical control area can be set for each second monochromatic light-emitting device in the pixel area 12. In this way, the orthographic projection of the optical control area on the substrate 11 can overlap with the orthographic projection of the second monochromatic light-emitting device on the substrate 11, but does not overlap with the orthographic projection of the first monochromatic light-emitting device on the substrate 11. As described in the above embodiments, the overlap between the orthographic projection of the optical control area on the substrate 11 and the orthographic projection of the second monochromatic light-emitting device on the substrate 11 can include any of the following: the orthographic projection of the optical control area on the substrate 11 covers the orthographic projection of the second monochromatic light-emitting device on the substrate 11; the orthographic projection of the optical control area on the substrate 11 falls within the orthographic projection of the second monochromatic light-emitting device on the substrate 11; and the orthographic projection of the optical control area on the substrate 11 partially overlaps with the orthographic projection of the second monochromatic light-emitting device on the substrate 11.

[0098] Using this example, it is not necessary to set an optical control area on the first monochromatic light-emitting device of white light, thereby avoiding the increase in the light output thickness of white light by setting an optical control area, and thus ensuring the light output brightness of the entire display panel.

[0099] In some embodiments, a monochromatic light-emitting device with a longer wavelength of emitted light color can correspond to an optical control region with a larger thickness. Specifically, please refer to Figure 7, which shows a detailed schematic diagram of region BB in Figure 4. As shown in Figure 7, the multiple optical control regions include a first optical control region 31a and a second optical control region 31b; wherein, the thickness of the first optical control region 31a is greater than the thickness of the second optical control region 31b, and the wavelength of the color corresponding to the monochromatic light-emitting device overlapping with the first optical control region 31a is greater than the wavelength of the color corresponding to the monochromatic light-emitting device overlapping with the second optical control region 31b.

[0100] As shown in Figure 7, a pixel region 12 includes multiple monochromatic light-emitting devices corresponding to different light-emitting colors. Different light-emitting colors correspond to different wavelengths. In conjunction with the above embodiments, the optimal optical film thickness of the emitted light can be measured by the optical period of the light-emitting color corresponding to the monochromatic light-emitting device. The optical period is related to the wavelength and the refractive index of the film layer. Specifically, the refractive index of multiple optical control regions of the optical control layer 30 can be the same, and the refractive index and thickness of the monochromatic light-emitting device are also fixed. Therefore, the thickness of each optical control region in the optical control layer 30 can be adjusted according to the wavelength corresponding to the light-emitting color of the monochromatic light-emitting device.

[0101] According to the above formula (1), the longer the wavelength of the emitted color, the larger the value of the optical period. Therefore, the larger the required optical film thickness, the larger the thickness of the optical control region can also be.

[0102] Specifically, for each pair of monochromatic light-emitting devices with different emitted colors, the monochromatic light-emitting device with a larger wavelength corresponds to the first optical control region 31a with a larger thickness, and the monochromatic light-emitting device with a smaller wavelength corresponds to the second optical control region 31b with a smaller thickness.

[0103] For example, as shown in Figure 7, taking a monochromatic light-emitting device (second monochromatic light-emitting device) other than white light in pixel area 12 as an example, pixel area 12 includes three second monochromatic light-emitting devices R / G / B. The light emitted by second monochromatic light-emitting device R is red, the light emitted by second monochromatic light-emitting device G is green, and the light emitted by second monochromatic light-emitting device B is blue. The wavelength of red is greater than the wavelength of green, and the wavelength of green is greater than the wavelength of blue. Therefore, the thickness of the optical control area corresponding to second monochromatic light-emitting device R is greater than the thickness of the optical control area corresponding to second monochromatic light-emitting device G, and the thickness of the optical control area corresponding to second monochromatic light-emitting device G is greater than the thickness of the optical control area corresponding to second monochromatic light-emitting device B.

[0104] In conjunction with the above embodiments, the optimal optical film thickness of the monochromatic light-emitting device can be adjusted by the film thickness of the optical control region, and the optical film thickness can be determined based on the optical period of the emitted light color propagating in the display panel.

[0105] The optical control layer 30 can be disposed on the side of the monochromatic light-emitting device away from the substrate 11. In this case, the optical control layer 30 is equivalent to increasing the light emission distance of the light emitted by the monochromatic light-emitting device to the light emission surface. Thus, by adjusting the thickness of the optical control area, the light emission distance of multiple monochromatic light-emitting devices can be adjusted to different degrees, so that the light emitted by different monochromatic light-emitting devices can reach the optimal brightness at the light emission surface after being adjusted by optical control areas of different thicknesses, such as reaching one or more optical cycles.

[0106] The optical control layer 30 can also be disposed on the side of the monochromatic light-emitting device close to the substrate 11. In this case, the optical control layer 30 is equivalent to raising the height of the monochromatic light-emitting device, thereby shortening the light emission distance of the light emitted by the monochromatic light-emitting device to the light emission surface. Compared with the case without the optical control layer 30, by adjusting the thickness of the optical control area, multiple monochromatic light-emitting devices can be raised to different degrees, so that the light emitted by the monochromatic light-emitting device can achieve the optimal brightness at the light emission surface, such as reaching one or more optical cycles.

[0107] It can be seen that the relative positions of the optical control layer 30 and the monochromatic light-emitting device are different, and their contributions to the optimal optical film thickness of the monochromatic light-emitting device are slightly different, but both can achieve the optimal light output.

[0108] Specifically, regardless of which side of the monochromatic light-emitting device the optical control layer 30 is placed on, by setting its film thickness and refractive index, the optical control region has a suitable optical path. The optical path of the optical control region can match the optical path of the monochromatic light-emitting device and the optical path of the film layer along the light emission path, so that the light emission of the monochromatic light-emitting device reaches the optimal level.

[0109] Referring to Figure 4, in one embodiment, the monochromatic light-emitting device includes an anode layer 131, an organic light-emitting layer 132, and a cathode layer 133 sequentially disposed in the thickness direction of the substrate 11; wherein, the display panel includes an array substrate 10 and a color filter substrate 20, and a plurality of monochromatic light-emitting devices are disposed on the array substrate 10; at least one insulating film layer 14 is also included between the color filter substrate 20 and the monochromatic light-emitting devices.

[0110] The sum of the optical path length of the optical control region, the optical path length of the organic light-emitting layer 132, the optical path length of the cathode layer 133, and the optical path length of the encapsulation layer 14 is equal to m optical cycles corresponding to the monochromatic light-emitting device that overlaps with the optical control region. The optical cycle is determined based on the wavelength of the emitted light color of the monochromatic light-emitting device and the refractive index of the organic light-emitting layer, and m is a positive integer greater than or equal to 1.

[0111] In this embodiment, the anode layer 131 is disposed close to the substrate 11, the organic light-emitting layer is located on the side of the substrate 11 away from the anode layer 131, and the cathode layer 133 is located on the side of the organic light-emitting layer 132 away from the substrate 11.

[0112] In this embodiment, as shown in FIG4, the color filter substrate 20 may include a color resist layer 23, which may include multiple color filter areas of different colors. Specifically, within the same pixel area 12, there may be three color filter areas, such as a green color filter area, a red color filter area, and a blue color filter area, which correspond to a monochromatic light-emitting device with a green light-emitting color, a monochromatic light-emitting device with a red light-emitting color, and a monochromatic light-emitting device with a blue light-emitting color within the pixel area 12, respectively.

[0113] At least one insulating film layer 14 may be disposed between the color filter substrate 20 and the monochromatic light-emitting device. The insulating film layer 14 may be made of organic or inorganic materials and is transparent. Exemplarily, multiple insulating film layers 14 may be disposed, or only one insulating film layer 14 may be disposed, as shown in FIG4, which illustrates the case where an insulating film layer 14 is disposed between the color resist layer 23 and the monochromatic light-emitting device.

[0114] It should be noted that the light emitted by the monochromatic light-emitting device passes through multiple film layers on the array substrate 10, enters the color filter substrate 20, and is emitted as three primary colors after passing through the color filter area of ​​the color filter substrate 20. During this process, the film layers on the array substrate 10 have a significant impact on the light output of the monochromatic light-emitting device. For example, at least one insulating film layer 14 between the monochromatic light-emitting device and the color filter substrate 20 has a significant impact on the light output. Therefore, when designing the optical path of the optical control region, the influence of the optical path of the insulating film layer 14 on the light output can be taken into account.

[0115] Optical path is a reduced quantity, which can be understood as the distance a light ray travels in a medium within the same amount of time. It's important to note that optical path differs from geometric distance. Specifically, optical path can be the product of the film's thickness and its refractive index, such as optical path D = nL, where n is the refractive index of the film and L is its thickness. For example, for a film, when the refractive index is 1, the film thickness equals the optical path; when the refractive index is greater than 1, the optical path is greater than the film thickness.

[0116] In this embodiment, the sum of the optical path lengths of the optical control region, the organic light-emitting layer 132, the cathode layer 133, and the insulating film layer 14 is equal to m optical cycles corresponding to the monochromatic light-emitting device that overlaps with the optical control region. Here, "equal to" can be understood as an approximation, such as the difference between the sum of multiple optical paths and m optical cycles. Left and right, if the difference can be

[0117] The optical period can be referred to in the above formula (1).

[0118] For example, referring to Figure 7, for the first optical control region 31a, which corresponds to the monochromatic light-emitting device R, the emitted light color of the monochromatic light-emitting device R is red light. Taking the wavelength of red light as 620 nanometers as an example, one optical cycle is... The sum of the optical path lengths of the first optical control region 31a, the organic light-emitting layer, the cathode layer, and the insulating film layer is: m times.

[0119] In another example of this embodiment, the light emitted by the monochromatic light-emitting device can also be reflected to one side of the substrate 11, thereby the thickness of the optical control region can also be calculated in conjunction with the phase loss of the reflected light.

[0120] Specifically, in this example, the optical path lengths of the insulating film layer 14, the optical control region, the organic light-emitting layer 132, and the cathode layer 133 satisfy the following relationship, as shown in formula (2): n4L4=A+m*(λ / 2)-n1*L1-n2*L2-n3*L3, Formula (2)

[0121] Wherein, n4 is the refractive index of the optical control layer 30, L4 is the thickness of the optical control region, λ is the wavelength, n1 is the refractive index of the organic light-emitting layer 132, L1 is the thickness of the organic light-emitting layer 132, n2 is the refractive index of the cathode layer 133, L2 is the thickness of the cathode layer 133, n3 is the refractive index of the insulating film layer 14, and L3 is the thickness of the insulating film layer 14.

[0122] In conjunction with the above embodiments, the optical control region corresponding to the monochromatic light-emitting device with a larger wavelength has a larger thickness. In this embodiment, when the sum of the optical path length of the insulating film layer 14, the optical path length of the optical control region, the optical path length of the organic light-emitting layer 132, and the optical path length of the cathode layer 133 is equal to m optical cycles corresponding to the monochromatic light-emitting device, the thickness of the optical control region can be related to the optical cycle corresponding to the monochromatic light-emitting device.

[0123] In one example, when multiple monochromatic light-emitting devices corresponding to different emitted colors have the same number of optical cycles, the monochromatic light-emitting device with a longer wavelength has a thicker optical control region. For example, for monochromatic light-emitting device R, the sum of the optical path length of its insulating film layer 14, the optical control region, the organic light-emitting layer 132, and the cathode layer 133 is equal to 2 optical cycles; for monochromatic light-emitting devices G and B, the sum of the optical path lengths of their insulating film layer, optical control region, organic light-emitting layer, and cathode layer is also equal to 2 optical cycles. Therefore, the thickness of the optical control region corresponding to monochromatic light-emitting device R is greater than the thickness of the optical control region corresponding to monochromatic light-emitting device G, and the thickness of the optical control region corresponding to monochromatic light-emitting device G is greater than the thickness of the optical control region corresponding to monochromatic light-emitting device B.

[0124] In another example, when multiple monochromatic light-emitting devices corresponding to different emitted colors have different numbers of optical cycles, the thickness of the optical control region corresponding to the monochromatic light-emitting device with a longer wavelength is not necessarily larger. For example, for monochromatic light-emitting device R, the sum of the optical path length of its insulating film layer, the optical path length of its optical control region, the optical path length of its organic light-emitting layer, and the optical path length of its cathode layer is equal to 2 optical cycles; for monochromatic light-emitting devices G and B, the sum of the optical path lengths of their insulating film layer, optical control region, organic light-emitting layer, and cathode layer is not equal to 2 optical cycles. In this case, the thickness of the optical control region corresponding to monochromatic light-emitting device R is not necessarily greater than the thickness of the optical control region corresponding to monochromatic light-emitting device G. That is to say, the thickness of each optical control region can be determined according to the required number of optical cycles.

[0125] In this embodiment, the insulating film layer 14 can be used to encapsulate a monochromatic light-emitting device. Therefore, in some of the examples below, at least one insulating film layer 14 is used as an encapsulation layer.

[0126] In some embodiments, the optical path length of the optical control region can be kept less than one optical cycle to avoid the problem of excessive thickness of the optical control region increasing the optical path length.

[0127] In this embodiment, the total optical path of the monochromatic light-emitting device can be greater than one optical cycle. For example, the total optical path of the monochromatic light-emitting device can be greater than one optical cycle and less than m optical cycles. The total optical path of the monochromatic light-emitting device can be the sum of the optical path of the organic light-emitting layer and the optical path of the cathode layer.

[0128] In some instances, the total optical path of a monochromatic light-emitting device can also be less than one optical cycle.

[0129] In cases where the optical path length of the optical control region is less than one optical cycle, the difference between the optical path length of the optical control region and the total optical path length of the monochromatic light-emitting device can be less than one optical cycle. For example, taking red light with a wavelength of 620 nanometers as an example, one optical cycle is... The total optical path of a monochromatic light-emitting device is greater than Located in the second optical cycle, that is, the total optical path of the monochromatic light-emitting device is The difference between the optical path length of the optical control region and the total optical path length of the monochromatic light-emitting device can be less than one optical cycle. This allows the difference to be compensated by the optical path length of the insulating film layer. Generally, the optical path length of the encapsulation layer can be less than several optical cycles, such as less than two optical cycles. Therefore, with a fixed encapsulation layer thickness, the thickness of the optical control region can be minimized as much as possible.

[0130] In some embodiments, when the display panel is a WOLED panel, the plurality of monochromatic light-emitting devices may include a first monochromatic light-emitting device corresponding to white light and a plurality of second monochromatic light-emitting devices corresponding to different colored lights. Regardless of whether it includes a first optical control layer 31 or a second optical control layer 32, the display panel may include a color resist layer. The color resist layer is located on the side of the monochromatic light-emitting device away from the substrate 11 and on the side of the optical control layer 30 away from the substrate 11. The color resist layer includes a plurality of color filter areas corresponding to the plurality of second monochromatic light-emitting devices respectively. The orthographic projection of the color filter area on the substrate 11 overlaps with the orthographic projection of the second monochromatic light-emitting device on the substrate 11, and the orthographic projection of the optical control area on the substrate 11 overlaps with the orthographic projection of the color filter area on the substrate 11.

[0131] Referring to Figures 4 and 5, the color resist layer is located on the side of the monochromatic light-emitting device facing away from the substrate 11, and is used to adjust the color of the light emitted by the monochromatic light-emitting device. Specifically, the color resist layer may include multiple color filter areas of different colors. For example, within the same pixel area 12, it may include three color filter areas, such as a green color filter area, a red color filter area, and a blue color filter area. Specifically, the light emitted by the second monochromatic light-emitting device is converted to green light after passing through the green color filter area, to red light after passing through the red color filter area, and to blue light after passing through the blue color filter area.

[0132] When the optical control layer 30 includes the first optical control layer 31, the light emitted from the second monochromatic light-emitting device will pass through the first optical control layer 31 and then enter the color resist layer. When the optical control layer 30 includes the second optical control layer 32, the light emitted from the second monochromatic light-emitting device will not pass through the second optical control layer 32 and enter the color resist layer, but can directly enter the color resist layer.

[0133] In this design, a color filter area may not be provided above the first monochromatic light-emitting device to ensure the transmittance of white light and improve display brightness.

[0134] In some embodiments, the optical control layer 30 may include a first optical control layer 31, which is located on the side of the monochromatic light-emitting device away from the substrate 11. For example, the first optical control layer 31 is located on the color filter substrate.

[0135] In this embodiment, the display panel may further include:

[0136] Planarization layer 24 is located on the side of the first optical control layer 31 that is away from the substrate 11;

[0137] Color resist layer 23 is located on the side of the planarization layer opposite to the substrate 11.

[0138] Referring to Figure 4, the color resist layer 23 may include multiple color filter areas of different colors. As shown in the above embodiment, within the same pixel area 12, there may be three color filter areas, such as a green color filter area, a red color filter area, and a blue color filter area. The three color filter areas may be arranged alternately on the substrate 11, and the orthographic projection of the color filter area on the substrate 11 may overlap with the orthographic projection of the monochromatic light-emitting device on the substrate 11.

[0139] The planarization layer 24 is located on the side of the color resist layer close to the substrate 11. The planarization layer 24 is made of a transparent material, and the orthogonal projection of the planarization layer 24 on the substrate 11 can cover the orthogonal projection of the color resist layer on the substrate 11.

[0140] The first optical control layer 31 can be located on the side of the planarization layer 24 close to the substrate 11. The orthographic projection of the optical control area in the first optical control layer 31 on the substrate 11 can overlap with the orthographic projection of the color filter area on the substrate 11. The overlap can include at least one of the following: the orthographic projection of the optical control area on the substrate 11 covers the orthographic projection of the color filter area on the substrate 11; the orthographic projection of the optical control area on the substrate 11 is located within the orthographic projection of the color filter area on the substrate 11; or the orthographic projection of the optical control area on the substrate 11 partially overlaps with the orthographic projection of the color filter area on the substrate 11.

[0141] In a further example of this embodiment, the planarization layer 24 may include a plurality of protrusions protruding toward the first optical control layer 31. That is, the surface of the planarization layer facing away from the substrate 11 is flush, while the surface of the planarization layer facing closer to the substrate 11 is uneven. In this embodiment, the optical control region in the first optical control layer 31 may be located on the side of the protrusions facing away from the color resist layer 23.

[0142] In this embodiment, please refer to FIG8, which shows a cross-sectional structural schematic diagram of another display panel. As shown in FIG8, the planarization layer 24 can cover the entire substrate 11. The surface of the planarization layer 24 away from the substrate 11 is flat, and the surface of the planarization layer 24 near the substrate 11 is uneven. Specifically, the surface of the planarization layer 24 away from the substrate 11 includes a plurality of protrusions 241 that protrude toward the monochromatic light-emitting device. The orthographic projection of the protrusions 241 on the substrate 11 can overlap with the orthographic projection of the monochromatic light-emitting device on the substrate 11. The optical control area in the first optical control layer 31 can be located on the side of the protrusions near the substrate 11.

[0143] For example, the surface of the protrusion 241 near the substrate 11 is flat, and the optical control area is located on the flat surface of the protrusion 241 near the substrate 11 and can coincide with the surface of the protrusion 241 near the substrate 11.

[0144] In some examples, as shown in Figure 8, the cross-section of the protrusion 241 in the thickness direction of the substrate 11 can be trapezoidal, specifically, it can be an inverted trapezoid or an upright trapezoid. In this way, the outer wall of the protrusion can be sloped.

[0145] In this example, the first optical control layer 31 can be located on the color filter substrate 20. An encapsulation layer 14 can be provided on the side of the monochromatic light-emitting device away from the substrate 11. The encapsulation layer 14 can be located on the array substrate, as shown in FIG8. The encapsulation layer 14 can include a plurality of recesses recessed into the monochromatic light-emitting device, as shown in FIG7 and 8. The optical control region can be fitted with the recesses. The outer contour of the orthographic projection of the recess on the substrate 11 can roughly coincide with the outer contour of the orthographic projection of the optical control region on the substrate 11. For example, the outer contour of the orthographic projection of the recess on the substrate 11 can surround the outer contour of the orthographic projection of the optical control region on the substrate 11, and the two can be in close contact. Thus, when the color filter substrate and the array substrate are assembled, the recesses can be combined with the optical control region, so that no transition film layer is provided between the optical control region and the encapsulation layer, thereby not increasing the light emission thickness of the monochromatic light-emitting device.

[0146] More specifically, if the thickness of the optical control region is different, the size of the recess on the encapsulation layer 14 in the thickness direction of the substrate 11 (which can be called the depth of the recess) can also be different. For example, in the two optical control regions, the recess corresponding to the optical control region with a larger thickness has a larger depth, and the recess corresponding to the optical control region with a smaller thickness has a smaller depth.

[0147] In the case where the planarization layer 24 includes a plurality of protrusions 241 and the optical control region is located on the surface of the protrusions near the substrate 11, an encapsulation layer can be provided on the side of the monochromatic light-emitting device away from the substrate 11. The encapsulation layer can include a plurality of recesses recessed into the monochromatic light-emitting device, as shown in FIG8. The protrusions and recesses can be fitted together, thereby enabling the color filter substrate and the array substrate to be aligned.

[0148] In cases where the planarization layer includes multiple protrusions, the protrusions can fit into the recesses. In this case, since the thicknesses of the multiple optical control regions are not uniform, the thicknesses of the protrusions can also be not uniform. Specifically, the sum of the thicknesses of the optical control regions and the protrusions can be equal to the depth of the recesses. In this example, the thickness of the protrusions can refer to their dimension in the thickness direction of the substrate 11. This allows for uniform depth of the recesses and uniform sum of the thicknesses of the protrusions and the optical control regions.

[0149] In some embodiments, the optical control layer 30 may include a second optical control layer 32, which may be located on the side of the monochromatic light-emitting device close to the substrate 11. In this case, the display panel may also include a reflective metal layer 15, and the second optical control layer 32 may be located between the monochromatic light-emitting device and the reflective metal layer 15.

[0150] Referring to FIG9, a cross-sectional structural schematic diagram of a display panel in another embodiment is shown. As shown in FIG9, the orthographic projection of the reflective metal layer 15 on the substrate 11 can overlap with the orthographic projection of the monochromatic light-emitting device on the substrate 11, and the orthographic projection of the optical control area on the substrate 11 can overlap with the orthographic projection of the reflective metal layer on the substrate 11. For example, the orthographic projection of the optical control area on the substrate 11 can cover the orthographic projection of the reflective metal layer 15 on the substrate 11.

[0151] In this embodiment, the reflective metal layer 15 can be made of metal or metal oxide materials, such as ITO, etc., and can be a transparent material, a semi-transparent material, or a non-transparent material.

[0152] In this embodiment, the reflective metal layer can be used to reflect the light emitted by the monochromatic light-emitting device onto one side of the substrate 11, so that most of the light emitted by the monochromatic light-emitting device can be emitted from the light-emitting surface side (i.e. the color filter substrate side), thereby improving the light extraction efficiency.

[0153] In some embodiments, as shown in FIG9, the display panel may further include a pixel defining layer 16 located on one side of the substrate 11. The pixel defining layer 16 may include a plurality of opening regions, and a monochromatic light-emitting device may be located within the opening regions. In the case of including a second optical control layer 32, the plurality of optical control regions of the second optical control layer 32 may be located within the plurality of opening regions respectively.

[0154] As shown in Figure 9, the optical control region is located within the opening region and on the side of the monochromatic light-emitting device closer to the substrate 11 within the opening region. The optical control region being located within the opening region can include at least one of the following: the orthogonal projection of the optical control region on the substrate 11 is covered by the orthogonal projection of the opening region on the substrate 11; the orthogonal projection of the optical control region on the substrate 11 covers the orthogonal projection of the opening region on the substrate 11; and it overlaps with the pixel defining layer.

[0155] In one example, the vertical distance from the surface of the monochromatic light-emitting device away from the substrate 11 to the substrate 11 can be less than the vertical distance from the surface of the pixel defining layer 16 away from the substrate 11 to the substrate 11. This allows the organic light-emitting layer of the monochromatic light-emitting device to be isolated by the pixel defining layer 16, thereby avoiding crosstalk between pixels.

[0156] In some examples, the optical control layer 30 may include multiple sub-control layers. Specifically, the multiple sub-control layers may be stacked sequentially in the thickness direction of the substrate 11. The refractive indices of each two adjacent sub-control layers are different. Thus, the optical control layer 30 may be a film layer with alternating high and low refractive indices.

[0157] For example, as shown in Figure 10, which illustrates several cross-sectional structures of an optical control layer 30, the optical control layer 30 may include multiple sub-control layers stacked sequentially in the thickness direction of the substrate 11. For example, it may include two, three, or four sub-control layers, etc. The multiple sub-control layers may be formed using different materials, thereby making the refractive indices of the multiple sub-control layers different.

[0158] Specifically, the multiple sub-control layers can be made of two transparent materials, which are periodically distributed along the thickness direction of the substrate 11. That is, one of every two adjacent sub-control layers is made of transparent material A, and the other is made of material B. For example, as shown in Figure 10(a), the optical control layer 30 has four sub-control layers made of the two materials. The first sub-control layer 301 made of material A, the second sub-control layer 302 made of material B, the third sub-control layer 303 made of material A, and the second and fourth sub-control layers 304 made of material B are sequentially stacked along the thickness direction of the substrate 11. In this way, the refractive index of the multiple sub-control layers can be an alternating combination of the two refractive indices.

[0159] In another example, the materials of the multiple sub-control layers can be different, so that any two adjacent sub-control layers use different materials, thereby forming an optical control layer 30 with alternating high and low refractive indices. For example, as shown in FIG10(b), the optical control layer 30 includes four sub-control layers, with a first sub-control layer 301 made of material A, a second sub-control layer 302 made of material B, a third sub-control layer 303 made of material C, and a fourth sub-control layer 304 made of material D sequentially stacked in the thickness direction of the substrate 11. Thus, the refractive indices of the multiple sub-control layers can be different.

[0160] In this embodiment, the refractive indices of the multiple sub-control layers are different. In practice, in the thickness direction of the substrate 11, the refractive indices of the multiple sub-control layers can be a combination of high / low / high / low or a combination of low / high / low / high.

[0161] In this embodiment, the refractive index of the multiple sub-control layers can vary in the refractive index range of 1.7 to 2. For example, the refractive indices of the multiple sub-control layers can be 1.7, 1.8, 1.7, and 1.8, respectively; or, for example, the refractive indices of the multiple sub-control layers can be 1.7, 1.9, 1.8, 2.0, and 1.7, respectively.

[0162] In some embodiments, the refractive index of the more than 30 sub-control layers of the optical control layer may be different from the refractive index of the organic light-emitting layer 132 in the monochromatic light-emitting device, or the refractive index of some of the sub-control layers may be the same as the refractive index of the organic light-emitting layer 132.

[0163] The optical control layer 30 may include a sub-control layer with a refractive index less than that of the organic light-emitting layer 132, or may include a sub-control layer with a refractive index greater than that of the organic light-emitting layer; or it may include both sub-control layers with a refractive index less than that of the organic light-emitting layer and sub-control layers with a refractive index greater than that of the organic light-emitting layer.

[0164] In this embodiment, the optical modulation layer 30 may include multiple sub-modulation layers, and the refractive indices of the multiple sub-modulation layers are matched with different levels. This can improve the light extraction rate of the light emitted by the monochromatic light-emitting device, thereby improving the display brightness of the display panel.

[0165] In this embodiment, when the optical control layer 30 includes a first optical control layer 31, the first optical control layer 31 may include multiple sub-control layers, all of which are made of transparent materials. When the optical control layer 30 includes a second optical control layer 32, the second optical control layer 32 may also include multiple sub-control layers, which may be made of transparent or semi-transparent materials. Specifically, transparent materials may be used. In this way, when the monochromatic light-emitting device is incident on the second optical control layer 32, the transmittance of the second optical control layer 32 can be increased, and the light can be reflected back by the reflective metal layer 15 located on the side of the second optical control layer 32 near the substrate 11. This can improve the light reflection efficiency of the monochromatic light-emitting device by the reflective metal layer 15, so that most of the light incident on the reflective metal layer 15 is reflected back. As a result, the light extraction rate of the monochromatic light-emitting device can be increased, thereby reducing the load on the display panel.

[0166] In some embodiments, when a first optical control layer 31 and a second optical control layer 32 are included, the first optical control layer 31 may include multiple sub-control layers, or both the first optical control layer 31 and the second optical control layer 32 may include multiple sub-control layers. This primarily increases the light extraction efficiency along the path from the monochromatic light-emitting device to the light-emitting surface. Of course, when both the first optical control layer 31 and the second optical control layer 32 include multiple sub-control layers, the number of sub-control layers included in the first optical control layer 31 may be the same as or different from the number of sub-control layers included in the second optical control layer 32.

[0167] In some embodiments, where the optical control layer 30 includes a first optical control layer 31, the display panel may further include an encapsulation layer, which may be located on the side of the monochromatic light-emitting device away from the substrate 11 and between the monochromatic light-emitting device and the first optical control layer 31.

[0168] In this embodiment, the first optical control layer 31 may have a different refractive index than the encapsulation layer 14, for example, less than or greater than the refractive index of the encapsulation layer 14. Where the first optical control layer 31 comprises multiple sub-control layers, the refractive index of the sub-control layer closest to the substrate 11 is different from that of the encapsulation layer 14. The remaining sub-control layers may include sub-control layers with the same refractive index as the encapsulation layer 14, and sub-control layers with a different refractive index than the encapsulation layer 14. For example, as shown in FIG10, in the thickness direction of the substrate 11, the refractive index of the first sub-control layer 301 closest to the substrate 11 may be different from that of the encapsulation layer 14. The multiple sub-control layers other than the first sub-control layer may include sub-control layers with the same refractive index as the encapsulation layer; of course, the multiple sub-control layers other than the first sub-control layer may not include sub-control layers with the same refractive index as the encapsulation layer.

[0169] In this embodiment, the thickness of the encapsulation layer can be 0.5-2μm, for example, it can be 0.5μm, 0.6μm, 0.7μm, 1μm, 1.2μm, 1.3μm, 1.5μm or 2μm.

[0170] In some examples, as shown in Figures 4 and 5, the display panel can be a WOLED display panel. A WOLED display panel generally includes an array substrate and a color filter substrate that is paired with the array substrate. The array substrate includes multiple monochromatic light-emitting devices, and the color filter substrate is used to filter the light emitted by the multiple monochromatic light-emitting devices on the array substrate to emit the three primary colors. The optical control layer 30 can be located on the side of the color filter substrate closer to the array substrate, and / or located on the array substrate.

[0171] In this embodiment, the optical control layer 30 located on the side of the color filter substrate closer to the array substrate is located on the side of the monochromatic light-emitting device away from the substrate 11. In practice, it can be the first optical control layer 31.

[0172] In this embodiment, the optical control layer 30 located on one side of the array substrate can be located on the side of the monochromatic light-emitting device away from the substrate 11, or it can be located on the side of the monochromatic light-emitting device close to the substrate 11.

[0173] As described in the above embodiments, the optical control layer 30 may include a first optical control layer 31 located on the side of the monochromatic light-emitting device facing away from the substrate 11. This first optical control layer 31 may be located on the side of the color filter substrate closer to the array substrate. Alternatively, the optical control layer 30 may include a second optical control layer 32 located on the side of the monochromatic light-emitting device closer to the substrate 11. This second optical control layer 32 may be located on one side of the array substrate and also on the side of the monochromatic light-emitting device closer to the substrate 11.

[0174] The display panel using this embodiment allows the optical control layer 30 to be fabricated together with the color filter substrate or with the array substrate. When fabricated together with the array substrate, the second optical control layer 32 can be formed before the formation of the monochromatic light-emitting device, thereby improving the fabrication flexibility of the optical control layer 30.

[0175] In some embodiments, to ensure light transmittance, the optical control layer 30 can be a semi-transparent or fully transparent material. For example, the optical control layer 30 may include a transparent material, such as any one of ITO (indium tin oxide), IZO (indium zinc oxide), IGZO (indium gallium zinc oxide), SiOx (silicon oxide), and SiNx (silicon nitride). Among these, ITO, IZO, and IGZO are semiconductor films.

[0176] In some embodiments, the thickness of multiple monochromatic light-emitting devices can be the same. For example, in a WOLED display panel, the thickness of multiple monochromatic light-emitting devices within a pixel area 12 can be consistent. Specifically, consistent thickness can mean that the thickness difference of the monochromatic light-emitting devices is between 0 and 2 μm. For WOLED display panels, the thickness of the monochromatic light-emitting devices can be based on the thickness of the white light-emitting device. For example, the thickness of the first monochromatic light-emitting device can be used as the standard.

[0177] In some embodiments, the display panel can be a WOLED display panel, and the monochrome light-emitting device can adopt a three-layer structure to improve the display brightness. For example, the light-emitting device may include an anode layer, an organic light-emitting layer and a cathode layer disposed sequentially in the thickness direction of the substrate 11.

[0178] The organic light-emitting layer includes a first blue fluorescent light-emitting layer, a yellow fluorescent light-emitting layer, a second blue fluorescent light-emitting layer, and a first charge transport layer between the first blue fluorescent light-emitting layer and the yellow fluorescent light-emitting layer, and a second charge transport layer between the second blue fluorescent light-emitting layer and the yellow fluorescent light-emitting layer, which are sequentially disposed in the thickness direction of the substrate 11.

[0179] For example, please refer to Figure 11, which shows a cross-sectional view of a monochromatic light-emitting device. As shown in Figure 11, the substrate 11 includes, in the thickness direction, the following layers in sequence: a total reflection anode 131, a hole transport layer HTL, a first blue fluorescent light-emitting layer B-EML, a first charge transport layer CGL, a yellow fluorescent layer Y-EML, a second charge transport layer CGL, a second blue fluorescent light-emitting layer B-EML, a hole blocking layer HBL, an electron transport layer ETL, and a semi-transparent cathode layer. The light-emitting device shown in Figure 11 can be called an RY device, wherein the total reflection anode is disposed close to the substrate 11.

[0180] The display panel of this disclosure embodiment will be described below with reference to several specific examples.

[0181] Example #1

[0182] Please refer to Figure 4. The display panel is a WOLED display panel, which includes an array substrate and a color filter substrate that is paired with the array substrate. The optical control layer 30 includes a first optical control layer 31, which is located on one side of the color filter substrate.

[0183] The array substrate 10 includes the following structure:

[0184] Substrate 11;

[0185] Reflective metal layer 15;

[0186] The pixel defining layer 16 includes multiple opening regions;

[0187] Multiple monochromatic light-emitting devices 13 are provided, each light-emitting device is located within an opening region, and includes an anode layer, an organic light-emitting layer, and a cathode layer sequentially disposed in the thickness direction of a substrate 11; wherein, the anode layer is made of ITO material and the cathode layer is made of IZO material; wherein, the orthographic projection of the reflective metal layer on the substrate 11 is located within the orthographic projection of the opening region on the substrate 11.

[0188] The encapsulation layer 14 is located on the side of the monochromatic light-emitting device away from the substrate 11, and is used to encapsulate multiple monochromatic light-emitting devices. The thickness of the encapsulation layer is 0.5-2μm.

[0189] The color filter substrate 20 includes:

[0190] The first optical control layer 31 is located close to the encapsulation layer and includes multiple optical control areas. Optical control areas are only set on the monochromatic light-emitting devices R, G, and B, while optical control areas may not be set on the monochromatic light-emitting device W.

[0191] Planarization layer 24 is located on the side of the first optical control layer 31 that is away from the array substrate;

[0192] Black matrix layer 22 includes multiple openings;

[0193] The color resist layer 23 is located on the side of the planarization layer opposite to the array substrate, and includes multiple color filter areas, each of which is located in multiple openings.

[0194] The encapsulation cover 21 is located on the side of the color resist layer that is away from the array substrate.

[0195] The first optical control layer 31, the planarization layer, and the color resist layer can be sequentially fabricated on the encapsulation cover plate, which is a transparent cover plate, such as transparent glass.

[0196] The display panel of this example #1 can improve the light extraction efficiency of the monochromatic light-emitting device (R / G / B) by adjusting the optimal optical film thickness of the monochromatic light-emitting device by adding a first optical control layer 31 to the encapsulation cover. The first optical control layer 31 can be a semiconductor film layer such as ITO / IZO / IGZO prepared by sputtering process, or other films with high transparency and filtration, such as SiOx / SiNx.

[0197] The optical control layer 30 can also be a combination of two sub-control layers with different refractive indices, forming a combination with the encapsulation layer to improve light output. It can be a combination of high / low / high refractive indices or a combination of low / high / low refractive indices.

[0198] The thickness of each optical control region in the optical control layer 30 can be determined according to the optical period corresponding to the monochromatic light-emitting device. The optical period of the monochromatic light-emitting device can be determined by referring to the above formula (1).

[0199] Specifically, the relationship between the refractive index n4 and the thickness L4 of the optical control region in the first optical control layer 31 is: n4L4=A+m*(λ / 2)-n1*L1-n2*L2-n3*L3. In the above formula, n1 / n2 / n3 are the refractive indices of the organic light-emitting layer, the cathode layer and the encapsulation layer, respectively; L1 / L2 / L3 are the thicknesses of the organic light-emitting layer, the cathode layer and the encapsulation layer, respectively; m is the number of optical periods; A is the reflection phase loss; and λ is the wavelength corresponding to the emitted color of the monochromatic light-emitting device.

[0200] Example #2

[0201] Please refer to Figure 9. This example differs from Example #1 in that the optical control layer 30 includes a second optical control layer 32, which is disposed on one side of the array substrate. Specifically, the second optical control layer 32 is located between the monochromatic light-emitting device and the reflective metal layer.

[0202] In this embodiment, the thickness of the white light device is mainly determined, and then the thickness of the optical control area under different colors is determined according to the period of different colors. The thickness of the optical control area is determined according to the optical period formula. For example, the wavelengths of R / G / B are 620 / 550 / 460, the refractive index of the organic light-emitting layer is 1.8, and the optical periods of R / G / B are 1700 / 1500 / 1300 Å.

[0203] In this embodiment, to account for the intensity of blue light, the optical path of the first blue light source from the reflective surface is typically located in the second optical cycle. Therefore, in the monochromatic light-emitting device, the optical path lengths of the monochromatic light-emitting device R, G, and B to the reflective surface in the second optical cycle are respectively: 700 / 600 / 500A+λ / 2n. Based on the above formula, the optical thickness of a white light-emitting device with a color point of (0.30, 0.32)±0.02 in a conventional top-emitting device is shown in Figure 12. Figure 12 includes the thickness range of each film layer in the monochromatic light-emitting device.

[0204] In this embodiment, an optical control area can be added only below the monochromatic light-emitting device R, monochromatic light-emitting device G, and monochromatic light-emitting device B, while there is no optical control area below the monochromatic light-emitting device W (i.e., the white sub-pixel). According to the above formula (2), the optimal thickness of the optical control area below the monochromatic light-emitting device R is 200-400 Å, the optimal thickness of the optical control area below the monochromatic light-emitting device G is 100-200 Å, and the optimal thickness of the optical control area below the monochromatic light-emitting device B is 50-200 Å. Correspondingly, the light emitted from the monochromatic light-emitting devices R and G is in the third optical cycle at the light-emitting surface. Specifically, the optical path length of the emitted light from the monochromatic light-emitting device R to the light-emitting surface is 1900-2100 Å, and the optical path length of the emitted light from the monochromatic light-emitting device G to the light-emitting surface is 1600-1700 Å.

[0205] Among them, the optical thickness of the aforementioned monochromatic light-emitting devices R, G, and B is adapted to an optical control layer 30 with a refractive index of 1.7-2.

[0206] Based on the same inventive concept, this disclosure also provides a display device, including the display panel described in the above embodiments, which may be a WOLED display device.

[0207] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0208] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0209] The above provides a detailed description of a display panel and display device provided by this disclosure. Specific examples have been used to illustrate the principles and implementation methods of this disclosure. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this disclosure. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this disclosure. Therefore, the content of this specification should not be construed as a limitation of this disclosure.

[0210] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0211] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

[0212] The terms "an embodiment," "embodiment," or "one or more embodiments" as used herein mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of this disclosure. Furthermore, please note that the examples of the phrase "in one embodiment" do not necessarily all refer to the same embodiment.

[0213] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of this disclosure may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0214] In the claims, any reference signs placed between parentheses should not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. This disclosure can be implemented by means of hardware comprising a plurality of different elements and by means of a suitably programmed computer. In a unit claim enumerating a plurality of means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc., does not indicate any order. These words may be interpreted as names.

[0215] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure, and are not intended to limit them. Although this disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this disclosure.

Claims

1. A display panel, characterized in that, include: The substrate includes multiple pixel regions; Multiple monochromatic light-emitting devices are located on one side of the substrate, and one pixel area includes multiple monochromatic light-emitting devices corresponding to different colors; as well as, An optical control layer is located on the side of the monochromatic light-emitting device facing away from and / or close to the substrate. The optical control layer includes a plurality of optical control regions, wherein the orthographic projection of one of the optical control regions on the substrate overlaps with the orthographic projection of one of the monochromatic light-emitting devices on the substrate. The optical control regions that overlap with the monochromatic light-emitting devices corresponding to different colors have different thicknesses.

2. The display panel according to claim 1, characterized in that, A pixel region includes a first monochromatic light-emitting device corresponding to white light, and a plurality of second monochromatic light-emitting devices corresponding to different colored lights; The orthographic projection of the optical control area on the substrate overlaps with the orthographic projection of the second monochromatic light-emitting device on the substrate, but does not overlap with the orthographic projection of the first monochromatic light-emitting device on the substrate.

3. The display panel according to claim 1, characterized in that, The plurality of optical control regions include a first optical control region and a second optical control region. The wavelength of the color corresponding to the monochromatic light-emitting device that overlaps with the first optical control region is greater than the wavelength of the color corresponding to the monochromatic light-emitting device that overlaps with the second optical control region. The thickness of the first optical control region is greater than the thickness of the second optical control region.

4. The display panel according to claim 1, characterized in that, The monochromatic light-emitting device includes an anode layer, an organic light-emitting layer, and a cathode layer sequentially disposed in the thickness direction of the substrate; at least one insulating film layer is also included on the side of the monochromatic light-emitting device facing away from the substrate; The sum of the optical path length of the optical control region, the optical path length of the organic light-emitting layer, the optical path length of the cathode layer, and the optical path length of the insulating film layer is equal to m optical cycles corresponding to a monochromatic light-emitting device that overlaps with the optical control region. The optical period is determined based on the wavelength of the emitted color of the monochromatic light-emitting device and the refractive index of the organic light-emitting layer, and m is a positive integer greater than or equal to 1.

5. The display panel according to claim 4, characterized in that, The optical path length of the optical control region is less than one optical cycle.

6. The display panel according to claim 4, characterized in that, The display panel further includes: the optical path of the insulating film layer, the optical path of the optical control area, the optical path of the organic light-emitting layer and the optical path of the cathode layer satisfy the following relationship: n4L4=A+m*(λ / 2)-n1*L1-n2*L2-n3*L3; Wherein, n4 is the refractive index of the optical control layer, L4 is the thickness of the optical control region, λ is the wavelength, n1 is the refractive index of the organic light-emitting layer, L1 is the thickness of the organic light-emitting layer, n2 is the refractive index of the cathode layer, L2 is the thickness of the cathode layer, n3 is the refractive index of the insulating film layer, and L3 is the thickness of the insulating film layer.

7. The display panel according to claim 1, characterized in that, The optical control layer includes a first optical control layer located on the side of the monochromatic light-emitting device facing away from the substrate; The display panel further includes: A planarization layer is located on the side of the first optical control layer that faces away from the substrate; A color resist layer is located on the side of the planarization layer opposite to the substrate.

8. The display panel according to claim 7, characterized in that, The planarization layer includes a plurality of protrusions that bulge toward the first optical control layer; The optical control area in the first optical control layer is located on the side of the protrusion away from the color resist layer.

9. The display panel according to claim 1, characterized in that, The display panel also includes: A reflective metal layer is located on the side of the second optical control layer closer to the substrate; The optical control layer includes a second optical control layer, which is located between the monochromatic light-emitting device and the reflective metal layer.

10. The display panel according to claim 9, characterized in that, The display panel also includes: A pixel defining layer, located on one side of the substrate, includes multiple opening regions, and multiple monochromatic light-emitting devices are respectively located within the multiple opening regions; In this embodiment, the plurality of optical control regions in the second optical control layer are respectively located within the plurality of opening regions.

11. The display panel according to claim 1, characterized in that, A pixel region includes a first monochromatic light-emitting device corresponding to white light, and a plurality of second monochromatic light-emitting devices corresponding to different colored lights; The display panel also includes: A color resist layer is located on the side of the monochromatic light-emitting device facing away from the substrate, and on the side of the optical control layer facing away from the substrate. The color resist layer includes multiple color filter areas corresponding to multiple second monochromatic light-emitting devices respectively. Wherein, the orthographic projection of the color filter area on the substrate overlaps with the orthographic projection of the monochromatic light-emitting device on the substrate, and the orthographic projection of the optical control area on the substrate overlaps with the orthographic projection of the color filter area on the substrate.

12. The display panel according to claim 1, characterized in that, The optical control layer comprises a plurality of sub-control layers stacked sequentially in the thickness direction of the substrate, wherein each pair of adjacent sub-control layers has a different refractive index.

13. The display panel according to claim 1, characterized in that, The optical control layer includes a first optical control layer located on the side of the monochromatic light-emitting device facing away from the substrate; The display panel also includes: An encapsulation layer is located between the monochromatic light-emitting device and the first optical control layer; The refractive index of the first optical control layer is different from that of the encapsulation layer.

14. The display panel according to claim 1, characterized in that, The optical control layer includes a transparent material, which includes any one of ITO, IZO, IGZO, SiOx, and SiNx.

15. The display panel according to any one of claims 1-14, characterized in that, The display panel includes an array substrate and a color filter substrate that is paired with the array substrate, wherein the substrate and a plurality of the monochromatic light-emitting devices are located on the array substrate; The optical control layer is located on the side of the color filter substrate close to the array substrate, and / or on the array substrate.

16. The display panel according to any one of claims 1-14, characterized in that, The monochromatic light-emitting device includes an anode layer, an organic light-emitting layer, and a cathode layer sequentially disposed in the thickness direction of the substrate; The organic light-emitting layer includes a first blue fluorescent light-emitting layer, a yellow fluorescent light-emitting layer, and a second blue fluorescent light-emitting layer sequentially disposed in the thickness direction of the substrate; In addition, a first charge transport layer between the first blue fluorescent emitting layer and the yellow fluorescent emitting layer, and a second charge transport layer between the second blue fluorescent emitting layer and the yellow fluorescent emitting layer.

17. The display panel according to any one of claims 1-14, characterized in that, The thickness of the multiple monochromatic light-emitting devices is the same.

18. A display device, characterized in that, Includes the display panel described in any one of claims 1-17.

Images