Display panel and display device

Abstract

The application provides a display panel and a display device. The display panel comprises a substrate, a plurality of light emitting devices arranged on the substrate, and a cover plate arranged on the side of the light emitting devices away from the substrate. The surface of the cover plate on the side facing the substrate is provided with an anti-reflection layer, and the refractive index of the anti-reflection layer is less than the refractive index of the cover plate. Meanwhile, the optical thickness of the anti-reflection layer is set so that the light reflected by the two surfaces in the thickness direction of the anti-reflection layer interferes destructively. Based on the above design, the cover plate and the anti-reflection layer cooperate to cause the reflected light on the cover plate to interfere destructively, enhance the transmittance of the light, and thus improve the problem that the service life of the display panel is affected by the increased power consumption.

Description

Technical Field

[0001] This application relates to the field of display technology, and more specifically to a display panel and a display device having the same. Background Technology

[0002] In display panels, a cover plate is typically placed on the light-emitting side of the light-emitting device to encapsulate the device or protect the entire display panel. However, the cover plate has a certain reflectivity to the light emitted by the light-emitting device, which reduces the transmittance of the light emitted by the device, thereby increasing the power consumption of the device and affecting the lifespan of the display panel. Summary of the Invention

[0003] A first aspect of this application provides a display panel, which includes a substrate, a plurality of light-emitting devices disposed on the substrate, and a cover plate disposed on the side of the light-emitting devices facing away from the substrate. An anti-reflection layer is provided on the surface of the cover plate facing the substrate, and the refractive index of the anti-reflection layer is less than the refractive index of the cover plate. At the same time, the optical thickness of the anti-reflection layer is set such that the light reflected from the two surfaces in the thickness direction of the anti-reflection layer interferes cancelably.

[0004] In the above scheme, the reflected light from the surface of the cover plate facing the anti-reflection layer is refracted by the anti-reflection layer and then exits. This reflected light cancels out the reflection of light from the surface of the anti-reflection layer facing away from the cover plate, thus enhancing the transmitted light. This improves the problem of increased power consumption of the display panel due to the reduced light transmittance caused by the cover plate's reflection. Furthermore, the destructive interference occurs in the optical path located inside the display panel, which further contributes to improving the panel's transmittance.

[0005] In conjunction with the first aspect, in some embodiments, the antireflection layer includes multiple antireflection units. The relationship between the wavelength of the emitted light from the light-emitting device and the optical thickness of the corresponding antireflection unit satisfies 2ne = (k + 1 / 2)λ, where ne is the optical thickness of the antireflection unit corresponding to the light-emitting device, n is the refractive index of the antireflection unit corresponding to the light-emitting device, e is the physical thickness of the antireflection unit corresponding to the light-emitting device, λ is the wavelength of the emitted light from the light-emitting device, and K is a natural number. Furthermore, the antireflection units are configured in a one-to-one correspondence with the multiple light-emitting devices.

[0006] In the above scheme, anti-reflection units with corresponding optical thicknesses are set according to different light-emitting devices, and different anti-reflection units are combined with cover plates to enhance the vertical light output of different colors of light emitted by different light-emitting devices. This reduces the power consumption of the display panel while improving the display effect of the display panel.

[0007] In conjunction with the first aspect, in some embodiments, the plurality of light-emitting devices include a first type of light-emitting device and a second type of light-emitting device, wherein the wavelength of light emitted by the first type of light-emitting device is greater than the wavelength of light emitted by the second type of light-emitting device. The plurality of anti-reflection units include a first type of anti-reflection unit corresponding to the first type of light-emitting device and a second type of anti-reflection unit corresponding to the second type of light-emitting device, wherein the optical thickness of the first type of anti-reflection unit is greater than the optical thickness of the second type of anti-reflection unit. Further, the first type of anti-reflection unit and the second type of anti-reflection unit are made of the same material, and the physical thickness of the first type of anti-reflection unit is greater than the physical thickness of the second type of anti-reflection unit.

[0008] In the above scheme, setting the optical thickness of the first type of anti-reflection unit corresponding to the first type of light-emitting device to be greater than the optical thickness of the second type of anti-reflection unit corresponding to the second type of light-emitting device is beneficial to achieving a thinner and lighter display panel.

[0009] In conjunction with the first aspect, in some implementations, the physical thickness of each antireflective element is uniform.

[0010] In the above scheme, the scheme of uniformly designing the physical thickness of the anti-reflection unit corresponding to each light-emitting device can effectively improve the vertical light extraction efficiency of the emitted light from different light-emitting devices.

[0011] In conjunction with the first aspect, in some embodiments, the physical thickness of the edge region of the antireflection unit is less than the physical thickness of the middle region of the antireflection unit. Furthermore, the physical thickness of the antireflection unit gradually decreases from the middle region to the edge region.

[0012] In the above scheme, the antireflection unit is designed with different film thicknesses in different areas. This allows the antireflection layer to improve the vertical light emission of the display panel, as well as the light emission at the tilt angle, thereby further improving the display effect.

[0013] In conjunction with the first aspect, in some embodiments, the orthographic projection of each light-emitting device on the substrate falls within the orthographic projection of the corresponding antireflection unit on the substrate.

[0014] In the above scheme, by making the planar area of ​​each anti-reflection unit larger than the planar area of ​​its corresponding light-emitting device and completely covering its corresponding light-emitting device in space, the anti-reflection unit can cause the reflected light emitted by its corresponding light-emitting device to interfere and cancel each other over a larger range, thereby further improving the light transmittance.

[0015] In conjunction with the first aspect, in some embodiments, the cover plate is made of glass.

[0016] In conjunction with the first aspect, in some embodiments, the display panel further includes a sealing frame that seals the substrate and the cover plate together, with a plurality of light-emitting devices and the anti-reflection layer located within the sealing frame. In this case, the cover plate is configured as an encapsulation cover plate, and the anti-reflection layer is provided on the substrate-facing surface of the encapsulation cover plate.

[0017] In the above scheme, the design of setting an anti-reflection layer on the side of the encapsulation cover facing the substrate can achieve the effect of efficiently improving the light transmittance of the display panel through a simple design.

[0018] In conjunction with the first aspect, in some embodiments, the display panel further includes a thin-film encapsulation layer disposed between the light-emitting device and the anti-reflection layer. In this case, the cover plate is configured as a protective cover plate disposed on the side of the light-emitting device facing away from the substrate. Further, the protective cover plate has an anti-reflection layer on its surface facing the substrate.

[0019] In the above solution, the anti-reflection layer set between the substrate of the display panel and the protective cover can also work with the protective cover to achieve the effect of canceling the interference of reflected light and enhancing the transmittance. Therefore, this solution increases the diversity of the display panel structure.

[0020] In conjunction with the first aspect, in some embodiments, the antireflective layer is prepared from at least one of magnesium fluoride, silicon dioxide, silicon dioxide-titanium oxide composite material, or silicon dioxide-zirconia composite material.

[0021] A second aspect of this application provides a display device. This display device includes any of the display panels provided in the first aspect described above. Attached Figure Description

[0022] Figure 1 This is a cross-sectional view of a display panel according to an embodiment of this application.

[0023] Figure 2 This is an optical path diagram between the cover plate and the anti-reflective layer in a display panel according to an embodiment of this application.

[0024] Figure 3 This is a cross-sectional view of a display panel according to an embodiment of this application.

[0025] Figure 4 This is a cross-sectional view of a display panel according to an embodiment of this application.

[0026] Figure 5 This is an optical path diagram between the cover plate and the first anti-reflection unit in a display panel according to an embodiment of this application.

[0027] Figure 6 This is a cross-sectional view of a display panel according to another embodiment of this application.

[0028] Figure 7 This is a cross-sectional view of a display panel according to an embodiment of this application.

[0029] Figure 8 This is a cross-sectional view of a display panel according to another embodiment of this application.

[0030] Figure 9 This is a cross-sectional view of a display panel according to an embodiment of this application.

[0031] Figure 10 This is a cross-sectional view of a display panel according to another embodiment of this application.

[0032] Figure 11 This is a cross-sectional view of a display panel according to an embodiment of this application.

[0033] Figure 12 This is a cross-sectional view of a display panel according to an embodiment of this application. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0035] As is well known, the transmittance of a display panel directly affects the display effect. Specifically, when the transmittance of a display panel is low, the displayed image will be darker. Therefore, in addition to affecting the display effect, it also increases the power consumption of the display panel, affecting its lifespan. Numerous studies have confirmed that a significant factor affecting the transmittance of a display panel is that at least one of the multiple film layers in the display panel reflects the light emitted from the light-emitting devices. Therefore, there is an urgent need to provide a solution to improve the reflectivity of the display panel due to the reflection problem caused by the film layers, thereby increasing the transmittance of the display panel.

[0036] This application provides a display panel including a substrate, a plurality of light-emitting devices disposed on the substrate, and a cover plate disposed on the side of the substrate facing away from the light-emitting devices. An anti-reflection layer is disposed on the surface of the cover plate facing the substrate, and the refractive index of the anti-reflection layer is less than the refractive index of the cover plate. Simultaneously, the optical thickness of the anti-reflection layer is set such that the light reflected from the two surfaces of the anti-reflection layer in the thickness direction interferes destructively. Specifically, the reflected light reflected from the surface of the cover plate facing the anti-reflection layer is refracted by the anti-reflection layer and exits the anti-reflection layer. The optical path difference between this reflected light and the light reflected from the surface of the anti-reflection layer facing away from the cover plate satisfies the condition for destructive interference. Therefore, the two reflected lights interfere destructively, and the transmitted light is enhanced, thereby reducing the reflected light in the display panel, increasing the transmittance of the display panel, and thus improving the problem of reduced light output caused by cover plate reflection, thereby solving the problem of increased power consumption of the display panel.

[0037] For example, such as Figure 1 and Figure 2 As shown, the display panel includes a substrate 101 and a plurality of light-emitting devices 400, an anti-reflection layer 300, and a cover plate 200 sequentially stacked on the display side of the substrate 101. The refractive index of the anti-reflection layer 300 is less than that of the cover plate 200. At a positive tilt angle, light A emitted from the light-emitting device 400 is reflected by the surface of the anti-reflection layer 300 away from the cover plate 200 to form reflected light A1. Simultaneously, light A emitted from the light-emitting device 400 is perpendicularly incident on the anti-reflection layer 300 and reflected by the surface of the anti-reflection layer 300 adjacent to the cover plate 200 to form reflected light A2. Importantly, the optical thickness of the anti-reflection layer 300 is set such that the reflected light A1 and the reflected light A2 interfere destructively, increasing transmittance. Furthermore, it is worth noting that, in addition to cooperating with the anti-reflection layer 300 to achieve destructive interference of reflected light in the optical path inside the display panel, the cover plate 200 is also a functional film layer in the display panel, which can play other roles, such as encapsulation or protection.

[0038] It should be understood that, Figure 2 Only a partial optical path diagram of the light emitted from the light-emitting device is shown, specifically the path of light ray A between the cover plate and the anti-reflection layer; the portion of the path of light ray A exiting through the cover plate is not shown. It is also worth noting that light with a positive tilt angle is not limited to... Figure 2 The scheme in which the angle between the light ray A and the cover plate and the anti-reflective layer is 90° is also included. The scheme in which the light ray forms an acute angle with the cover plate and the anti-reflective layer can also include a scheme in which the angle between the light ray and the cover plate and the anti-reflective layer is greater than 0° and less than 30°. This will not be elaborated here.

[0039] The following explanation, based on the structure of the aforementioned display panel, details the principle of the destructive interference of reflected light occurring on the surface of the anti-reflective layer away from the cover plate.

[0040] When light emitted from the light-emitting device reaches the surface of the anti-reflection layer away from the cover plate and the surface where the anti-reflection layer intersects with the cover plate, due to the wave nature of light, whether the reflected light reflected from the two surfaces interferes destructively depends on their phase relationship, which in turn depends on the optical path difference between the two reflected lights. Specifically, when the optical path difference satisfies 2ne = (k + 1 / 2)λ (where n is the refractive index of the anti-reflection layer, e is the physical thickness of the anti-reflection layer, λ is the wavelength of the light emitted from the light-emitting device corresponding to the anti-reflection layer, and K is a natural number), the two reflected lights interfere destructively, and transmission is enhanced.

[0041] Considering that one of the important factors affecting the display effect of the display panel is the light emission efficiency of the light-emitting device, this embodiment further designs the structure of the anti-reflection layer according to the type of light-emitting device of the display panel.

[0042] For example, in some embodiments, the antireflection layer includes multiple antireflection units. The relationship between the wavelength of the emitted light from the light-emitting device and the optical thickness of the corresponding antireflection unit satisfies 2ne = (k + 1 / 2)λ, where ne is the optical thickness of the antireflection unit corresponding to the light-emitting device, n is the refractive index of the antireflection unit corresponding to the light-emitting device, e is the physical thickness of the antireflection unit corresponding to the light-emitting device, λ is the wavelength of the emitted light from the light-emitting device, and K is a natural number. In at least one embodiment, the antireflection units are arranged in a one-to-one correspondence with multiple light-emitting devices. In this way, the reflected light from each light-emitting device at the cover plate interface undergoes destructive interference, thereby simultaneously enhancing the vertical light extraction efficiency of different light-emitting devices. This, in turn, reduces the power consumption of the display panel while improving the display effect.

[0043] For example, such as Figure 3As shown, the display panel includes a substrate 101, a first light-emitting device 400a, a second light-emitting device 400b, and a third light-emitting device 400c disposed on the substrate 101, and an anti-reflection layer 300 and a cover plate 200 are sequentially stacked on the side of the light-emitting device 400 facing away from the substrate 101. Specifically, the first light-emitting device 400a is a red light-emitting device R, the second light-emitting device 400b is a green light-emitting device G, and the third light-emitting device 400c is a blue light-emitting device B. The different types of light-emitting devices 400 correspond to different types. The antireflection layer includes a first antireflection unit 301a corresponding to the light-emitting device R, a second antireflection unit 301b corresponding to the light-emitting device G, and a third antireflection unit 301c corresponding to the light-emitting device B. The optical thickness of the first antireflection unit 301a is an odd multiple of a quarter wavelength of the red light emitted by the light-emitting device R, the optical thickness of the second antireflection unit 301b is an odd multiple of a quarter wavelength of the green light emitted by the light-emitting device G, and the optical thickness of the third antireflection unit 301c is an odd multiple of a quarter wavelength of the blue light emitted by the light-emitting device B.

[0044] There are various schemes for setting different anti-reflection units according to different light-emitting devices. Considering various factors in actual production, this embodiment specifically introduces one of the implementation methods in the following content.

[0045] In some embodiments, the plurality of light-emitting devices include a first type of light-emitting device and a second type of light-emitting device, wherein the wavelength of light emitted by the first type of light-emitting device is greater than the wavelength of light emitted by the second type of light-emitting device. The plurality of anti-reflection units include a first type of anti-reflection unit corresponding to the first type of light-emitting device and a second type of anti-reflection unit corresponding to the second type of light-emitting device, wherein the optical thickness of the first type of anti-reflection unit is greater than the optical thickness of the second type of anti-reflection unit. In at least one embodiment, the first type of anti-reflection unit and the second type of anti-reflection unit are made of the same material, and the physical thickness of the first type of anti-reflection unit is greater than the physical thickness of the second type of anti-reflection unit. This design facilitates the thinning of the display panel.

[0046] For example, continue to refer to Figure 3It is known that in this display panel, the wavelength of red light emitted by light-emitting device R is greater than the wavelength of green light emitted by light-emitting device G, and the wavelength of green light emitted by light-emitting device G is greater than the wavelength of blue light emitted by light-emitting device B. Therefore, the optical thickness of the first anti-reflection unit 301a corresponding to light-emitting device R is greater than the optical thickness of the second anti-reflection unit 301b corresponding to light-emitting device G, and the optical thickness of the second anti-reflection unit 301b corresponding to light-emitting device G is greater than the optical thickness of the third anti-reflection unit 301c corresponding to light-emitting device B. The aforementioned optical thickness refers to the product of the physical thickness (geometric thickness) of the film layer and the refractive index of the film layer. Therefore, when the materials of the first anti-reflection unit 301a, the second anti-reflection unit 301b, and the third anti-reflection unit 301c are the same, their refractive indices are also the same. In this case, the physical thickness of the first anti-reflection unit 301a is greater than the physical thickness of the second anti-reflection unit 301b, and the physical thickness of the second anti-reflection unit 301b is greater than the physical thickness of the third anti-reflection unit 301c.

[0047] Furthermore, the first type of light-emitting device may only include light-emitting device R, and the corresponding first type of anti-reflection unit may only include the first anti-reflection unit 301a corresponding to light-emitting device R. Then, the second type of light-emitting device includes light-emitting device G and light-emitting device B, and the corresponding second type of anti-reflection unit includes the second anti-reflection unit 301b corresponding to light-emitting device G and the third anti-reflection unit 301c corresponding to light-emitting device B. Similarly, the first type of light-emitting device may only include light-emitting device R and light-emitting device G, and the corresponding first type of anti-reflection unit may only include the first anti-reflection unit 301a corresponding to light-emitting device R and the second anti-reflection unit 301b corresponding to light-emitting device G. Then, the corresponding second type of light-emitting device includes light-emitting device B, and the corresponding second type of anti-reflection unit includes the third anti-reflection unit 301c corresponding to light-emitting device B. When the display panel includes more light-emitting devices with different emitted light wavelengths, the light-emitting devices and the types of anti-reflection units corresponding to the light-emitting devices can also be classified according to the above classification, as long as the optical thickness of the anti-reflection unit corresponding to the light-emitting device with a larger emitted light wavelength is greater than the optical thickness of the anti-reflection unit corresponding to the light-emitting device with a smaller emitted light wavelength.

[0048] It should be understood that the design schemes for the physical thickness of the first antireflection unit, the second antireflection unit, and the third antireflection unit in this application are not limited to the exemplary schemes described above. When the fabrication materials of each antireflection unit corresponding to different light-emitting devices are different, the relationship between the physical thicknesses of the different antireflection units can be adjusted by selecting the refractive index of the fabrication material corresponding to each antireflection unit. Furthermore, when the fabrication materials of each antireflection unit are the same, the physical thickness of the antireflection unit corresponding to each light-emitting device can be designed to be different odd multiples of a quarter wavelength of the light emitted by different light-emitting devices, so that each antireflection unit has a different physical thickness. These can all be designed according to the specific requirements of the display panel, and will not be elaborated here.

[0049] This embodiment not only considers improving light transmittance by reducing reflection, but also takes into account the different light emission rates required by the display panel for the positive tilt angle and / or side tilt angle under different usage scenarios, and further designs the parameters of the different anti-reflection units in the anti-reflection layer. The details are as follows.

[0050] In some embodiments, the physical thickness of each antireflection unit is uniform. By uniformly setting the physical thickness of the antireflection units, the vertical light extraction efficiency of the light emitted from different light-emitting devices can be effectively improved, thereby increasing the lifespan of the display panel while also enhancing its display performance.

[0051] For example, continue to refer to Figure 3 It can be seen that in this display panel, the thickness of the anti-reflection unit corresponding to different light-emitting devices 400 is uniformly distributed, that is, the thickness of the first anti-reflection unit 301a corresponding to light-emitting device R is uniformly distributed, the thickness of the second anti-reflection unit 301b corresponding to light-emitting device G is uniformly distributed, and the thickness of the third anti-reflection unit 301c corresponding to light-emitting device B is uniformly distributed, so as to increase the vertical light emission rate of red light, green light and blue light respectively, thereby improving the transmittance of the positive tilt angle of the display panel.

[0052] In order to increase the light emission rate of the display panel at the tilt angle, in some embodiments, the physical thickness of the edge region of the anti-reflection unit is smaller than the physical thickness of the middle region of the anti-reflection unit.

[0053] For example, such as Figure 4 , Figure 5 and Figure 6 As shown, in this display panel, the thicknesses of the first anti-reflection unit 301a, the second anti-reflection unit 301b, and the third anti-reflection unit 301c are all designed to be non-uniform. Instead, they are designed such that the thickness of the edge region is less than that of the middle region, in order to increase the probability of interference cancellation of reflected light at large angles, thereby increasing the transmittance at the tilt angle.

[0054] Specifically, refer to Figure 5 Looking at the optical path diagram between the first antireflection unit 301a corresponding to the light-emitting device R and the cover plate 200, when a large-angle ray B illuminates the edge region, a portion of the ray B is refracted by the first antireflection unit 301a of the antireflection layer 300 to form refracted light B1. The refracted light B1 is reflected by the first antireflection unit 301a at the interface of the cover plate 200 to form reflected light B2. The reflected light B2 exits the first antireflection unit 301a to form refracted-reflected light B3. Simultaneously, another portion of the ray B is reflected by the first antireflection unit 301a away from the interface of the cover plate 200 to form reflected light B4. The reflected light B4 and the refracted-reflected light B3 interfere destructively, thus enhancing the transmittance of the cover plate 200. And referring to... Figure 2 and Figure 5 It can be seen that the wavelength range of the reflected light formed by the large-angle ray B is larger than that of the reflected light formed by the perpendicular ray A. Based on the requirement that the optical path difference 2ne = (k + 1 / 2)λ (where n is the refractive index of the first anti-reflection unit, e is the physical thickness of the first anti-reflection unit, λ is the wavelength of red light, and K is a natural number), it can be seen that... Figure 5 As shown, reducing the physical thickness of the film layer in the region where large-angle light enters can increase the probability of destructive interference of the reflected light from large-angle light at the cover plate 200 and the antireflection layer 300.

[0055] Based on the difference between the wavelength range of reflected light at large angles and the wavelength range of light at perpendicular angles, the physical thickness of the edge region of the anti-reflection unit corresponding to the large-angle light emitted by the light-emitting device can be designed to correspond to the physical thickness of the middle region of the anti-reflection unit.

[0056] For example, in one embodiment, the physical thickness of the antireflection unit in the antireflection layer gradually decreases from the central region to the edge region. Thus, by differentiating the thickness of different regions of the antireflection unit, the antireflection layer improves not only the vertical light emission rate of the display panel but also its side-tilt angle light emission rate, further enhancing the display effect.

[0057] For example, such as Figure 4 As shown, the display panel includes a light-emitting device R that emits red light, a light-emitting device G that emits green light, and a light-emitting device B that emits blue light. Simultaneously, the physical thickness of the first anti-reflection unit 301a corresponding to the light-emitting device R gradually decreases from the middle region to the edge region; the physical thickness of the second anti-reflection unit 301b corresponding to the light-emitting device G gradually decreases from the middle region to the edge region; and the physical thickness of the third anti-reflection unit 301c corresponding to the light-emitting device B gradually decreases from the middle region to the edge region.

[0058] For example, in another embodiment, the thickness of each antireflection unit from the edge region is less than the thickness of the middle region, and the thickness of the middle region changes in a step-like manner, that is, the thickness of the edge region far from the middle region is less than the thickness of the edge region close to the middle region, and the height of the two in the thickness direction of the display panel changes in a step-like manner. Such a design can interfere with and cancel out light within certain specific wavelength ranges of reflected light at large angles, in order to meet the requirements of the display panel.

[0059] For example, such as Figure 6 As shown, the display panel includes a light-emitting device R that emits red light, a light-emitting device G that emits green light, and a light-emitting device B that emits blue light. The physical thickness of the first anti-reflection unit 301a provided in the light-emitting device R changes in a step-like manner from the middle region to the edge region, the physical thickness of the second anti-reflection unit 301b provided in the light-emitting device G changes in a step-like manner from the middle region to the edge region, and the physical thickness of the third anti-reflection unit 301c provided in the light-emitting device B changes in a step-like manner from the middle region to the edge region.

[0060] It should be understood that the variation in the physical thickness of the edge region of each antireflection unit relative to its central region is not limited to the gradual or step-like variation shown in the examples above. It can also be set to other variations, such as a wavy line or an arc. Furthermore, the variation in the physical thickness of the antireflection units in the antireflection layer for different light-emitting devices within the same display panel can be the same or different. All of these can be selected based on the manufacturing process and functional requirements of the display panel, and will not be elaborated upon here.

[0061] Considering the color shift issue that may occur in the display panel at large tilt angles, this embodiment also improves the color shift issue in the display panel by designing the thickness variation of the anti-reflection unit corresponding to different light-emitting devices in the anti-reflection layer.

[0062] For example, in some embodiments, the display panel includes a first light-emitting device, a second light-emitting device, and a third light-emitting device that emit light of different colors respectively. At large tilt angles, the display panel's color is biased towards the color of the light emitted by the third light-emitting device. The thickness of the edge region of the first anti-reflection unit corresponding to the first light-emitting device is less than the thickness of its middle region; the thickness of the edge region of the second anti-reflection unit corresponding to the second light-emitting device is less than the thickness of its middle region; and the thickness of the third anti-reflection unit corresponding to the third light-emitting device is uniformly distributed. This increases the transmittance of the light emitted by the second and third light-emitting devices at their tilt angles, thereby increasing the proportion of light emitted by the second and third light-emitting devices at large tilt angles. This is equivalent to reducing the proportion of light emitted by the first light-emitting device, thus improving the color shift problem that occurs when the display panel is at large tilt angles.

[0063] For example, such as Figure 7 As shown, the display panel includes a light-emitting device R that emits red light, a light-emitting device G that emits green light, and a light-emitting device B that emits blue light. At large tilt angles, the displayed image tends to have a bluish tint. Therefore, in designing this display panel, the physical thickness of the third anti-reflection unit 301c corresponding to light-emitting device B is set to a uniform distribution. This reduces the transmittance of blue light emitted by light-emitting device B at large tilt angles, decreasing the proportion of blue light and thus improving the problem of a bluish tint in the displayed image at large tilt angles. Furthermore, the physical thickness of the first anti-reflection unit 301a and the second anti-reflection unit 301b corresponding to light-emitting devices R and G, respectively, is set such that the physical thickness of the edge region is less than that of the middle region. This increases the transmittance of red light emitted by light-emitting device R and the transmittance of green light emitted by light-emitting device G at large tilt angles, thus increasing the proportion of red and green light at large tilt angles and further improving the color shift problem at large tilt angles.

[0064] It should be understood that the light causing color shift issues at large tilt angles in display panels is not necessarily blue light; it could also be green, red, or even yellow light. Regardless of the color of the light causing the color shift, the principle described in the example above can be applied by adjusting the physical thickness of the anti-reflection units corresponding to different light-emitting devices. This changes the proportion of different colors of light at large tilt angles, thereby improving the color shift problem. Specific solutions can be designed based on the functional requirements of the display panel and production conditions, and will not be elaborated upon here.

[0065] In addition to designing the physical thickness of each antireflection unit, this embodiment also designs the planar area of ​​each antireflection unit. For example, in some embodiments, the orthographic projection of each light-emitting device on the substrate falls within the orthographic projection of the corresponding antireflection unit substrate. Considering that the range of light emitted by the light-emitting device is greater than its light-emitting area, the planar area of ​​the antireflection unit corresponding to each light-emitting device is made larger than the planar area of ​​the light-emitting device itself, i.e., the planar area of ​​the light-emitting layer corresponding to that device, and spatially completely covers the light-emitting device. In this way, the reflected light emitted by the light-emitting device can undergo destructive interference over a larger range, thereby more effectively reducing the power consumption of the display panel.

[0066] For example, such as Figure 7 and Figure 8 As shown, in this display panel, the planar area of ​​the antireflection unit corresponding to each light-emitting device 400 is larger than the planar area of ​​its corresponding light-emitting device 400 and spatially covers the light-emitting device. Specifically, the orthographic projection of the first antireflection unit 301a on the substrate 101 covers the orthographic projection of the light-emitting device R on the substrate 101, the orthographic projection of the second antireflection unit 301b on the substrate 101 covers the orthographic projection of the light-emitting device G on the substrate 101, and the orthographic projection of the third antireflection unit 301c on the substrate 101 covers the orthographic projection of the light-emitting device B on the substrate 101. This allows for destructive interference of the reflected light emitted by each light-emitting device over a larger range, further improving the transmittance of the display panel.

[0067] Furthermore, the proportion of different colors of light at large tilt angles can be changed by adjusting the planar area of ​​the anti-reflection units corresponding to different light-emitting devices, thereby improving the color shift problem. For example, when the display pattern on the display panel is bluish, the color shift problem can be improved by reducing the planar area of ​​the third anti-reflection unit corresponding to blue light and / or increasing the planar area of ​​the first anti-reflection unit corresponding to red light and the planar area of ​​the second anti-reflection unit corresponding to green light.

[0068] Furthermore, this embodiment also provides a detailed description of the design schemes of the cover plate and anti-reflection layer relative to other film layers in the display panel when the cover plate serves as different functional film layers.

[0069] In some embodiments, such as Figure 7As shown, cover plate 200 is a protective cover plate 500. Specifically, the protective cover plate 500 is a glass cover plate, i.e., a CG (cover glass) cover plate. Considering the material of the protective cover plate 500, the reflectivity of the protective cover plate 500 to the light emitted by the light-emitting device 400 is greater than the reflectivity of other film layers of the display panel to the light emitted by the light-emitting device 400. Therefore, the solution of setting an anti-reflection layer 300 on the side of the protective cover plate 500 facing the substrate 101 can not only effectively improve the transmittance of the display panel, but also make it easier to control the light emission effect. In addition, the manufacturing process of this solution is simple, saving the production cost of the display panel.

[0070] In other embodiments, the cover plate is an encapsulation cover plate, and an anti-reflection layer is provided on the substrate-facing surface of the encapsulation cover plate. The encapsulation cover plate, also known as an encapsulation cover plate, works in conjunction with encapsulation material disposed around the display substrate to achieve rigid encapsulation of the display substrate. In other words, an anti-reflection layer is provided on the surface of the encapsulation cover plate, which is positioned between the display substrate and the protective cover plate of the display panel, facing the display substrate. The encapsulation cover plate and the anti-reflection layer work together to cancel out interference of reflected light, enhancing the transmittance of the display panel. Therefore, this increases the structural diversity of the display panel.

[0071] For example, refer to Figure 8 and Figure 9 As can be seen, the display panel includes a display substrate 100, an encapsulation cover plate 800a, and a protective cover plate 500, i.e., a CG cover plate, stacked sequentially. The display substrate 100 includes a base 101 and a thin-film transistor layer 600 and a display functional layer 700 stacked sequentially on the base 101. The display functional layer 700 includes a first light-emitting device 400a, a second light-emitting device 400b, and a third light-emitting device 400c. Importantly, a sealed space is formed between the encapsulation cover plate 800a and the display substrate 100, and a first anti-reflection unit 301a corresponding to the first light-emitting device 400a, a second anti-reflection unit 301b corresponding to the second light-emitting device 400b, and a third anti-reflection unit 301c corresponding to the third light-emitting device 400c are formed on the surface of the encapsulation cover plate 800a facing the base 101.

[0072] In other embodiments, the cover plate includes an encapsulation cover plate and a protective cover plate stacked sequentially. A first antireflective layer with a refractive index lower than that of the encapsulation cover plate is provided on the surface of the encapsulation cover plate facing the substrate. A second antireflective layer with a refractive index lower than that of the protective cover plate is provided on the surface of the protective cover plate facing the substrate.

[0073] For example, such as Figure 10As shown, the display panel includes a display substrate 100, an encapsulation cover plate 800a, and a protective cover plate 500 (CG cover plate) stacked sequentially. A first anti-reflective layer 310 is provided on the surface of the encapsulation cover plate 800a facing the display substrate 100, and the refractive index of the first anti-reflective layer 310 is less than the refractive index of the encapsulation cover plate 800a. Simultaneously, a second anti-reflective layer 320 is provided on the surface of the protective cover plate 500 facing the display substrate 100, and the refractive index of the second anti-reflective layer 320 is less than the refractive index of the protective cover plate 500. This allows for more effective destructive interference of light emitted from the display panel within the display panel, improving the transmittance of the display panel. Furthermore, the second anti-reflective layer 320 can be disposed within a groove on the surface of the protective cover plate 500, or it can be directly disposed on the surface of the protective cover plate 500, with other fillers such as optical adhesives used to eliminate discontinuities.

[0074] It should be understood that, based on the existing display panel size design, the distance from the surface of the encap facing the substrate to the surface of the anode of the light-emitting device facing away from the substrate is 3µm to 4µm, and is not limited to this range. Furthermore, a polarizing structure, and / or a touch structure and / or a lens structure can be placed between the encap and the protective cover (CG cover). These can be designed according to the functional requirements of the display panel, and will not be elaborated upon here.

[0075] Based on the principle of destructive interference of reflected light at different film interfaces, it is known that in addition to optical path difference, destructive interference also places requirements on the refractive index and transmittance of the film. Generally, the material of the antireflection layer is chosen to have high transmittance and low refractive index (specifically, lower than the refractive index of the cover plate), typically non-metallic oxides, composites of metal oxides and non-metallic oxides, and some metal fluorides. In some embodiments, the antireflection layer is prepared using at least one of magnesium fluoride, silicon dioxide, silicon dioxide-titanium oxide composites, or silicon dioxide-zirconia composites.

[0076] For example, such as Figure 11As shown, the display panel includes a display substrate 100, an encapsulation layer 800b, a planarization layer 900, an anti-reflection layer 300, and a protective cover plate 500 (CG cover plate) stacked sequentially. The display substrate 100 includes a base 101 and a thin-film transistor layer 600 and a display functional layer 700 stacked sequentially on the base 101. The display functional layer 700 includes a first light-emitting device 400a, a second light-emitting device 400b, and a third light-emitting device 400c. Meanwhile, the anti-reflection layer 300 is made of magnesium fluoride with a refractive index of 1.38, and includes a first anti-reflection unit 301a corresponding to the first light-emitting device 400a, a second anti-reflection unit 301b corresponding to the second light-emitting device 400b, and a third anti-reflection unit 301c corresponding to the third light-emitting device 400c. Furthermore, the encapsulation layer 800b in this display panel is a thin-film encapsulation different from the encapsulation cover plate (encap cover plate).

[0077] Based on the formula 2ne=(k+1 / 2)λ (where n is the refractive index of the antireflection unit, e is the physical thickness of the antireflection unit, λ is the wavelength of the emitted light from the corresponding light-emitting device, and K is a natural number), where the wavelength of red light is approximately 620nm, the wavelength of green light is approximately 530nm, and the wavelength of blue light is approximately 460nm, the thickness corresponding to each antireflection unit is obtained as follows:

[0078] The thickness of the first antireflection unit 301a is 224.64*(k+1 / 2)nm, and its minimum film thickness is 112.32nm.

[0079] The thickness of the second antireflection unit 301b is 192*(k+1 / 2)nm, and its minimum film thickness is 96nm.

[0080] The thickness of the third antireflection unit 301c is 166.67*(k+1 / 2)nm, and its minimum film thickness is 83.34nm.

[0081] For example, based on Figure 11 The structure of the central display panel is referenced. Figure 12 As shown, the first antireflective unit 301a, the second antireflective unit 301b, and the third antireflective unit 301c are prepared from materials with different refractive indices. The refractive index of the material of the first antireflective unit 301a is greater than that of the material of the second antireflective unit 301b, and the refractive index of the second antireflective unit 301b is greater than that of the third antireflective unit 301c. This makes the physical thickness of the first antireflective unit 301a equal to the physical thickness of the second antireflective unit 301b, which in turn equals the physical thickness of the third antireflective unit 301c, thus facilitating the preparation of the antireflective layer 300.

[0082] This application also provides a display device. The display device includes any of the display panels provided in the above embodiments.

[0083] For example, at least one embodiment of the display device provided in this application further includes a touch sensor, a touch chip, and a flexible circuit board for implementing touch functionality. To achieve a thinner and lighter display panel, the touch sensor is disposed in the encapsulation layer of the display panel, the touch chip is disposed on the flexible circuit board, and signals are transmitted to the touch sensor via touch signal lines.

[0084] For example, the display device in the embodiments of this application can be any product or component with display function, such as a television, digital camera, mobile phone, watch, tablet computer, laptop computer, navigator, circular wearable product, etc.

[0085] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A display panel, characterized by, The display panel comprises: a substrate; a plurality of light emitting devices disposed on the substrate, the plurality of light emitting devices comprising a first type of light emitting device and a second type of light emitting device, the first type of light emitting device emitting light of a first wavelength and the second type of light emitting device emitting light of a second wavelength, the first wavelength being greater than the second wavelength; a cover plate disposed on a side of the light emitting devices facing away from the substrate, the cover plate comprising a surface facing the substrate, the surface comprising an anti-reflection layer, the anti-reflection layer having a refractive index less than a refractive index of the cover plate, the anti-reflection layer having an optical thickness configured to cause light reflected from both surfaces of the anti-reflection layer to destructively interfere with each other; wherein the anti-reflection layer comprises a plurality of anti-reflection units, each of the plurality of anti-reflection units corresponding to one of the plurality of light emitting devices, the plurality of anti-reflection units comprising a first type of anti-reflection unit corresponding to the first type of light emitting device and a second type of anti-reflection unit corresponding to the second type of light emitting device, the first type of anti-reflection unit having a physical thickness that is less at an edge region of the first type of anti-reflection unit than at a middle region of the first type of anti-reflection unit, and the second type of anti-reflection unit having a uniform physical thickness. A relationship between a wavelength of light emitted by the light emitting devices and an optical thickness of the anti-reflection units corresponding to the light emitting devices satisfies 2ne = (k + 1 / 2)λ, where ne is the optical thickness of the anti-reflection units corresponding to the light emitting devices, n is a refractive index of the anti-reflection units corresponding to the light emitting devices, e is a physical thickness of the anti-reflection units corresponding to the light emitting devices, λ is the wavelength of light emitted by the light emitting devices, and k is a natural number.

2. The display panel of claim 1, wherein, The first type of anti-reflection unit has a greater optical thickness than the second type of anti-reflection unit.

3. The display panel of claim 2, wherein, The first type of anti-reflection unit and the second type of anti-reflection unit are made of the same material, and the first type of anti-reflection unit has a greater physical thickness than the second type of anti-reflection unit.

4. The display panel of claim 3, wherein, The physical thickness of the first type of anti-reflection unit gradually decreases from the middle region to the edge region.

5. The display panel of claim 1, wherein, A footprint of each of the light emitting devices on the substrate falls within a footprint of the anti-reflection unit corresponding to the light emitting device on the substrate.

6. The display panel of claim 1, wherein, The cover plate is made of glass.

7. The display panel of claim 1, wherein, The display panel further comprises a sealant frame sealingly connecting the substrate and the cover plate, the plurality of light emitting devices and the anti-reflection layer being located within the sealant frame; or 8. The display panel of claim 1, wherein, The display panel further comprises a thin film encapsulation layer disposed between the light emitting devices and the anti-reflection layer. The anti-reflection layer is made of at least one of magnesium fluoride, silicon dioxide, a silicon dioxide-titanium oxide composite material, or a silicon dioxide-zirconium oxide composite material.

9. The display panel of claim 1, wherein, The display panel of any one of claims 1-9.

10. A display device, characterized by comprising: ​

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