Display module and display device

Abstract

The invention provides a display module and a display device, and relates to the technical field of display, and the display module can give consideration to relatively high luminous efficiency and relatively low reflectivity. The display module comprises a substrate; the light-emitting device layer is positioned on one side of the substrate and comprises a plurality of light-emitting elements; the reflective polarization structure is positioned on one side, far away from the substrate, of the light-emitting device layer; the first polarization structure is positioned on one side, far away from the substrate, of the reflective polarization structure; the cover plate is located on the side, away from the substrate, of the first polarization structure; the display module further comprises a first anti-reflection layer located on the side, away from the substrate, of the cover plate, and the first anti-reflection layer acts on the visible light full wave band. And the second anti-reflection layer is positioned between the cover plate and the light-emitting device layer.

Description

Technical Field

[0001] The present invention relates to the field of display technologies, and particularly to a display module and a display device. Background Art

[0002] An organic light - emitting diode (OLED) display module has many advantages such as self - emission and wide viewing angle, and is widely used in various display devices. However, the structural design of the existing display module is difficult to balance high light - emitting efficiency and low reflectivity, which brings limitations to the further optimization of its performance. Summary of the Invention

[0003] Embodiments of the present invention provide a display module and a display device, and the display module can balance high light - emitting efficiency and low reflectivity.

[0004] In a first aspect, embodiments of the present invention provide a display module, including: A substrate; A light - emitting device layer located on one side of the substrate, including a plurality of light - emitting elements; A reflective polarizing structure located on the side of the light - emitting device layer away from the substrate; A first polarizing structure located on the side of the reflective polarizing structure away from the substrate; A cover plate located on the side of the first polarizing structure away from the substrate; The display module further includes: A first anti - reflection layer located on the side of the cover plate away from the substrate, and the first anti - reflection layer acts on the entire visible light band; A second anti - reflection layer located between the cover plate and the light - emitting device layer.

[0005] In a second aspect, based on the same inventive concept, embodiments of the present invention further provide a display device, including the above - mentioned display module.

[0006] The technical solutions provided by the embodiments of the present invention have the following beneficial effects: In the display module provided by the embodiments of the present invention, antireflection layers are provided on both the inner and outer sides of the cover plate. The combined action of the antireflection layers on both sides can better reduce the reflectivity of the display module. Among them, a first antireflection layer is provided above the cover plate, and the first antireflection layer acts on the entire visible light band. When ambient light enters the display module, the first antireflection layer can reduce the reflection of ambient light in the entire wavelength range of visible light that can be perceived by the human eye on the outer side of the cover plate. At the same time, a second antireflection layer is also provided below the cover plate. On the premise that the first antireflection layer can already reduce the reflection of visible light in the entire band, the design of the band on which the second antireflection layer acts can be more flexible. For example, the second antireflection layer can also act on the entire band to further reduce the reflectivity of visible light in the ambient light, or the second antireflection layer can only act on a part of the band to specifically reduce the reflection of ambient light in this part of the band again, strengthening the antireflection effect of the display module on the ambient light in this part of the band.

[0007] In summary, in the display module provided by the embodiments of the present invention, while significantly improving the light extraction efficiency of the display module by using a reflective polarizing structure, the antireflection layers on both the inner and outer sides of the cover plate can be used to offset the side effect of the reflective polarizing structure on the reflection of ambient light, reducing the reflectivity of the display module to be the same as or lower than that of a display module without a reflective polarizing structure, making it have both a good integrated black effect and good outdoor readability. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative efforts.

[0009] Figure 1 FIG. is a schematic diagram of the effect of a display module on ambient light in the related art; Figure 2 FIG. is a schematic diagram of the effect of a display module on the light emitted by a light-emitting element in the related art; Figure 3 FIG. is another schematic diagram of the effect of a display module on the light emitted by a light-emitting element in the related art; Figure 4 FIG. is another schematic diagram of the effect of a display module on ambient light in the related art; Figure 5 FIG. is a schematic structural diagram of the display module provided by the embodiments of the present invention; Figure 6 FIG. is a schematic curve diagram of the reflectivity provided by the embodiments of the present invention; Figure 7 Another structural schematic diagram of the display module provided by the embodiment of the present invention; Figure 8 Another structural schematic diagram of the display module provided by the embodiment of the present invention; Figure 9 Another structural schematic diagram of the display module provided by the embodiment of the present invention; Figure 10 Another structural schematic diagram of the display module provided by the embodiment of the present invention; Figure 11 Another structural schematic diagram of the display module provided by the embodiment of the present invention; Figure 12 Another structural schematic diagram of the display module provided by the embodiment of the present invention; Figure 13 Another structural schematic diagram of the display panel provided by the embodiment of the present invention; Figure 14 Another structural schematic diagram of the display panel provided by the embodiment of the present invention; Figure 15 A structural schematic diagram of the cover plate provided by the embodiment of the present invention; Figure 16 Another structural schematic diagram of the cover plate provided by the embodiment of the present invention; Figure 17 Another structural schematic diagram of the cover plate provided by the embodiment of the present invention; Figure 18 Another structural schematic diagram of the cover plate provided by the embodiment of the present invention; Figure 19 A structural schematic diagram of the display device provided by the embodiment of the present invention. Detailed implementation manners

[0010] In order to better understand the technical solution of the present invention, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0011] It should be clear that the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0012] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms of "a", "the" and "said" used in the embodiments of the present invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0013] It should be understood that the term "and / or" used herein is merely a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this text generally represents an "or" relationship between the preceding and following associated objects.

[0014] Before elaborating on the technical solutions provided by the embodiments of the present invention, the present invention first describes the structure of the display module and the existing problems in the related art.

[0015] In the related art, referring to Figure 1 and Figure 2 , the display module includes a display panel 101, a quarter-wave plate 102, and a linear polarizer 103. Among them, the display panel 101 includes a light-emitting element 104.

[0016] Taking the transmission axis of the linear polarizer 103 as the vertical direction and the absorption axis as the horizontal direction as an example, as Figure 1 shown, Figure 1 is a schematic diagram of the action of the display module on ambient light in the related art. After the ambient light L1 enters the display module and reaches the linear polarizer 103, the linearly polarized light L2 with a vertical vibration direction can pass through, while the linearly polarized light with a horizontal vibration direction is absorbed. The linearly polarized light L2 with a vertical vibration direction continues to transmit inward, becomes a left-handed circularly polarized light L3-l after passing through the quarter-wave plate 102, and the left-handed circularly polarized light L3-l rotates 180° after being reflected by the metal in the display panel 101 and becomes a right-handed circularly polarized light L4-r. The right-handed circularly polarized light L4-r becomes a linearly polarized light L5 with a horizontal vibration direction after passing through the quarter-wave plate 102 again. The linearly polarized light L5 with a horizontal vibration direction will be absorbed by the linear polarizer 103 when passing through the linear polarizer 103, so it cannot be emitted. This structure can reduce the reflection of ambient light and improve the integrated black effect and outdoor readability of the display module.

[0017] However, this structure will cause the light extraction efficiency of the display module to decrease. As Figure 2 shown, Figure 2 is a schematic diagram of the action of the display module on the light emitted by the light-emitting element in the related art. The light L6 emitted by the light-emitting element 104 can pass through after passing through the quarter-wave plate 102, and no light with any vibration direction is absorbed. When this part of the light L6 passes through the linear polarizer 103, only the linearly polarized light L7 with a vertical vibration direction can be emitted, while the linearly polarized light with a horizontal vibration direction will be absorbed, which results in a decrease in the light extraction efficiency of the display module. Especially in medium and large-sized display modules, it causes a relatively large increase in the overall power consumption, increases power consumption, and is not conducive to the battery life of the whole machine.

[0018] In response, the related art further proposes a structure of a display module. Refer to Figure 3 and Figure 4 , the display module further includes a reflective polarizer 105, and the reflective polarizer 105 is located between the linear polarizer 103 and the quarter-wave plate 102.

[0019] Still taking the transmission axis of the linear polarizer 103 as the vertical direction and the absorption axis as the horizontal direction as an example, as Figure 3 shown, Figure 3 is another schematic diagram of the action of the display module on the light emitted by the light-emitting element in the related art. The light L8 emitted by the light-emitting element 104 can pass through after passing through the quarter-wave plate 102, and no light with any vibration direction is absorbed. When this part of the light L8 passes through the reflective polarizer 105, among them, the linearly polarized light L9 with the vibration direction in the vertical direction passes through and is emitted after passing through the linear polarizer 103, while the linearly polarized light L10 with the vibration direction in the horizontal direction is reflected to the quarter-wave plate 102 and becomes a right-handed circularly polarized light L11-r. The right-handed circularly polarized light L11-r is rotated 180° after being reflected by the display panel 101 and becomes a left-handed circularly polarized light L12-l. After passing through the quarter-wave plate 102, the left-handed circularly polarized light L12-l becomes a linearly polarized light L13 with the vibration direction in the vertical direction. The linearly polarized light L13 with the vibration direction in the vertical direction passes through the reflective polarizer 105 and is emitted after passing through the linear polarizer 103, improving the light extraction efficiency of the display module.

[0020] However, although the reflective polarizer 105 can improve the light extraction efficiency of the display module and reduce the power consumption of the module, it will have certain side effects on the reflection of ambient light. As Figure 4 shown, Figure 4Another schematic diagram showing the effect of ambient light on the display module in the related art. After the ambient light L15 enters the display module and reaches the linear polarizer 103, the linearly polarized light L16 with the vibration direction perpendicular to the vertical direction in the ambient light can pass through, while the linearly polarized light with the vibration direction horizontal is absorbed. The linearly polarized light L16 with the vibration direction perpendicular to the vertical direction is transmitted and continues to propagate after passing through the reflective polarizer 105, and becomes a left-handed circularly polarized light L17-l after passing through the quarter-wave plate 102. The left-handed circularly polarized light L17-l rotates 108° after being reflected by the metal in the display panel 101 and becomes a right-handed circularly polarized light L18-r. The right-handed circularly polarized light L18-r becomes a linearly polarized light L19 with the vibration direction horizontal after passing through the quarter-wave plate 102. The linearly polarized light L19 is reflected by the reflective polarizer 105 to be a linearly polarized light L20 with the vibration direction horizontal. The linearly polarized light L20 becomes a right-handed circularly polarized light L21-r after passing through the quarter-wave plate 102. The right-handed circularly polarized light L21-r rotates 180° after being reflected by the metal of the display panel 101 and becomes a left-handed circularly polarized light L22-l. The left-handed circularly polarized light L22-l becomes a linearly polarized light L23 with the vibration direction perpendicular to the vertical direction after passing through the quarter-wave plate 102. The linearly polarized light L23 passes through the reflective polarizer 105 with the vibration direction unchanged and then exits through the linear polarizer 103, resulting in reflection of the ambient light. Currently, the reflectivity of the display module with the reflective polarizer 105 reaches about 14.62%, seriously affecting the integrated black effect and outdoor readability of the display screen.

[0021] In view of this, an embodiment of the present invention provides a display module, which can take into account both high light extraction efficiency and low reflectivity.

[0022] As Figure 5 shown, Figure 5 A schematic structural diagram of the display module provided by the embodiment of the present invention. The display module includes a substrate 1 and a light-emitting device layer 2. Among them, the light-emitting device layer 2 is located on one side of the substrate 1 and includes a plurality of light-emitting elements 3. In the embodiment of the present invention, the light-emitting element 3 can be an OLED device.

[0023] The display module further includes a reflective polarizing structure 4, a first polarizing structure 5, and a cover plate 6. Among them, the reflective polarizing structure 4 is located on the side of the light-emitting device layer 2 away from the substrate 1, and may include a multilayer film reflective polarizer (Advanced Polarizing Film, APF); the first polarizing structure 5 is located on the side of the reflective polarizing structure 4 away from the substrate 1, and may include a linear polarizer; the cover plate 6 is located on the side of the first polarizing structure 5 away from the substrate 1, and may be a glass cover plate, for example. In addition, a quarter-wave plate 7 may be further included between the reflective polarizing structure 4 and the light-emitting device layer 2. Among them, the principle of action of the quarter-wave plate 7, the reflective polarizing structure 4, and the first polarizing structure 5 on light has been described in detail above, and will not be elaborated here.

[0024] The display module further includes a first anti-reflection layer 8 and a second anti-reflection layer 9. Among them, the first anti-reflection layer 8 is located on the side of the cover plate 6 away from the substrate 1 and acts on the entire visible light band. That is, the first anti-reflection layer 8 has high transmittance and low reflectance characteristics for visible light in the entire band range. Among them, the range of the entire visible light band may be 380 nm to 780 nm. The second anti-reflection layer 9 is located between the cover plate 6 and the light-emitting device layer 2.

[0025] Among them, the anti-reflection layer may be formed by stacking multiple film layers. When ambient light enters the anti-reflection layer, light is reflected and refracted at the interfaces of each film layer. By designing the refractive index and thickness of the materials of each film layer, the phase difference of the reflected light at each interface for light in a specific band range can meet the condition of destructive interference, thereby reducing the reflection of light in this band and increasing the transmittance of light in this band, achieving the anti-reflection effect on light in this band. For example, in one structure, the first anti-reflection layer 8 may include a titanium dioxide layer, a silicon oxide layer, a titanium nitride layer, and a magnesium fluoride layer arranged in sequence. Based on the mutual cooperation of these multiple film layers, it can increase the transmittance and reduce the reflection of visible light in the entire band range. Alternatively, the anti-reflection layer may also include a substrate and anti-reflection particles doped in the substrate, and the anti-reflection particles are used to achieve anti-reflection of light in a certain band range.

[0026] In the display module provided by the embodiments of the present invention, antireflection layers are provided on both the inner and outer sides of the cover plate 6. The antireflection layers on both sides work together to better reduce the reflectivity of the display module. Among them, a first antireflection layer 8 is provided above the cover plate 6. The first antireflection layer 8 acts on the entire visible light band. When ambient light enters the display module, the first antireflection layer 8 can reduce the reflection of ambient light in the entire wavelength range of visible light that can be perceived by the human eye on the outer side of the cover plate 6. At the same time, a second antireflection layer 9 is also provided below the cover plate 6. On the premise that the first antireflection layer 8 can already reduce the reflection of visible light in the entire band, the design of the band on which the second antireflection layer 9 acts can be more flexible. For example, the second antireflection layer 9 can also act on the entire band to further reduce the reflectivity of visible light in ambient light, or the second antireflection layer 9 can also act only on a part of the band to specifically reduce the reflection of ambient light in this part of the band again, strengthening the antireflection effect of the display module on the ambient light in this part of the band.

[0027] In summary, in the display module provided by the embodiments of the present invention, while greatly improving the light extraction efficiency of the display module by using the reflective polarizing structure 4, the antireflection layers on both the inner and outer sides of the cover plate 6 can also be used to offset the side effects brought by the reflection of ambient light by the reflective polarizing structure 4, so that the reflectivity of the display module is reduced to be the same as or lower than that of a display module without a reflective polarizing structure, making it have both a good integrated black effect and good outdoor readability.

[0028] In a feasible implementation manner, referring again to Figure 5 , the second antireflection layer 9 includes at least one sub-antireflection layer 10, and the band range on which at least part of the sub-antireflection layers 10 act is less than the range of the entire visible light band.

[0029] On the premise that a first antireflection layer 8 that reduces the reflection of the entire visible light band is already provided on the outer side of the cover plate 6, the sub-antireflection layer 10 on the inner side of the cover plate 6 can only perform characteristic adjustment on a part of the band, strengthening the antireflection and light transmission enhancement effect of the display module on the ambient light in this part of the band, so that the display module achieves the effect of the same reflectivity for ambient light in each band or the same light extraction efficiency for each color light.

[0030] In a feasible implementation manner, the reflectivity of the first antireflection layer 8 for light in the first band is greater than the reflectivity for light in the second band. Among them, at least part of the sub-antireflection layers 10 act on the first band.

[0031] The first antireflection layer 8 can reduce the reflection of visible light in the entire band, but due to factors such as its material properties and manufacturing processes, the degree of antireflection of the first antireflection layer 8 for light in different bands may vary, and thus the reflectivity of the first antireflection layer 8 for light in different bands is different.

[0032] When the reflectivity of the first anti-reflection layer 8 to light of the first wavelength band is greater than the reflectivity to light of the second wavelength band, at least one sub anti-reflection layer 10 is made to act on the first wavelength band. The sub anti-reflection layer 10 can reduce the reflection of light of the first wavelength band, thereby compensating for the difference in reflectivity of light of the first wavelength band and light of the second wavelength band brought by the first anti-reflection layer 8, so that the degree of anti-reflection of the display module to light of the first wavelength band reaches the same as that of light of the second wavelength band. Furthermore, the reflectivity of the display module to ambient light of each wavelength band can reach a very low level, optimizing the anti-reflection effect.

[0033] Furthermore, through testing by the inventor, it is found that the reflectivity of the first anti-reflection layer 8 to blue light is relatively high. As Figure 6 shown, Figure 6 is a schematic curve diagram of the reflectivity provided by an embodiment of the present invention. Among them, curve A is the reflectivity curve corresponding to when the first anti-reflection layer 8 is not provided above the cover plate 6. According to curve A, it can be seen that when the first anti-reflection layer 8 is not provided above the cover plate 6, the reflectivities corresponding to light of each wavelength band are relatively high. Curve B is the reflectivity curve corresponding to when the first anti-reflection layer 8 is provided above the cover plate 6. According to curve B, it can be seen that when the first anti-reflection layer 8 is provided above the cover plate 6, the reflectivities corresponding to the entire visible light band are significantly reduced, but compared with the red light band and the green light band, the reflectivity corresponding to the blue light band is slightly higher.

[0034] Therefore, in the embodiment of the present invention, the above-mentioned first wavelength band may include a blue light band, and the range of the blue light band may be 420 nm to 500 nm, that is, at least one sub anti-reflection layer 10 acts on the blue light band to increase the transmittance and reduce the reflection of blue light, so that the reflectivity of the display module to blue light in ambient light reaches the same as that of green light and red light.

[0035] In a feasible implementation manner, as Figures 7 - 9 shown, Figure 7 is another schematic structural diagram of the display module provided by an embodiment of the present invention, Figure 8 is still another schematic structural diagram of the display module provided by an embodiment of the present invention, Figure 9 is yet another schematic structural diagram of the display module provided by an embodiment of the present invention. The light-emitting element 3 includes a first light-emitting element 13. In the direction perpendicular to the plane where the substrate 1 is located, the reflective polarizing structure 4 overlaps at least with the first light-emitting element 13. Among them, at least part of the sub anti-reflection layer 10 acts on the wavelength band of the light emitted by the first light-emitting element 13.

[0036] A display module usually includes light-emitting elements of multiple colors. However, due to factors such as light-emitting materials, the luminous efficiencies of different light-emitting elements may vary. In an embodiment of the present invention, the light-emitting element 3 may further include a second light-emitting element 14, and the luminous efficiency of the first light-emitting element 13 is less than that of the second light-emitting element 14. In one structure, in a direction perpendicular to the plane of the substrate 1, the reflective polarizing structure 4 overlaps with the first light-emitting element 13 and does not overlap with the second light-emitting element 14. That is, the reflective polarizing structure 4 partially covers, and only specifically improves the light extraction efficiency of the light emitted by the first light-emitting element 13 of the display module, thereby improving the consistency of the light extraction efficiencies of different color lights of the display module. Of course, in other structures, the reflective polarizing structure 4 may also overlap with both the first light-emitting element 13 and the second light-emitting element 14.

[0037] The overlapping of the reflective polarizing structure 4 with the first light-emitting element 13 indicates that the reflective polarizing structure 4 acts on at least the first light-emitting element 13. The reflective polarizing structure 4 will at least semi-transmit and semi-reflect the light emitted by the first light-emitting element 13, and thus at least have a side effect on the reflection of the ambient light of this color. Therefore, in an embodiment of the present invention, at least part of the sub anti-reflection layer 10 can be set to act on the wavelength band of the light emitted by the first light-emitting element 13. On the one hand, the sub anti-reflection layer 10 can be used to reduce the reflection of the light of this color in the ambient light, further reducing the reflection of the display module to the ambient light. On the other hand, after the sub anti-reflection layer 10 increases the transmission of the light of this color, it can further improve the light extraction efficiency of the light emitted by the first light-emitting element 13 of the display module, making it consistent with the light extraction efficiency of the light emitted by the second light-emitting element 14.

[0038] In an embodiment of the present invention, the light-emitting device layer 2 includes a red light-emitting element 3-R, a green light-emitting element 3-G, and a blue light-emitting element 3-B. Among them, the luminous efficiency of the green light-emitting element 3-G is usually greater than that of the red light-emitting element 3-R and the blue light-emitting element 3-B.

[0039] In this regard, further, referring to Figure 7 and Figure 9 , the first light-emitting element 13 includes the red light-emitting element 3-R. The sub anti-reflection layer 10 includes a first sub anti-reflection layer 11. The first sub anti-reflection layer 11 acts on the red light wavelength band, increases the transmission and reduces the reflection of the red light. Thus, while further reducing the ambient light reflection by using the first sub anti-reflection layer 11, the characteristic of increasing the transmission of the red light can also be used to increase the transmittance of the red light of the display module and increase the light extraction efficiency of the red light. Among them, the range of the red light wavelength band can be 560 nm to 780 nm.

[0040] And / or, referring to Figure 8 and Figure 9, the first light-emitting element 13 includes a blue light-emitting element 3-B. The sub-anti-reflection layer 10 includes a second sub-anti-reflection layer 12, and the second sub-anti-reflection layer 12 acts on the blue light band to increase the transmittance and reduce the reflection of blue light. Thus, while further reducing the ambient light reflection by using the second sub-anti-reflection layer 12, the transmittance of the display module to blue light can also be increased by using its characteristic of increasing the transmittance of blue light, and the light extraction efficiency of blue light can be increased. Among them, the range of the blue light band can be 420 nm to 500 nm.

[0041] Among them, the first sub-anti-reflection layer 11 and the second sub-anti-reflection layer 12 can be respectively formed by stacking multiple film layers. Exemplarily, the first sub-anti-reflection layer 11 includes a first silicon oxide layer, a silicon nitride layer, and a second silicon oxide layer arranged in sequence, and the second sub-anti-reflection layer 12 includes a zirconium oxide layer, a silicon nitride layer, and a magnesium fluoride layer arranged in sequence.

[0042] Or, as Figure 10 shown, Figure 10 is another structural schematic diagram of the display module provided by the embodiment of the present invention. The first light-emitting element 13 includes a red light-emitting element 3-R and a blue light-emitting element 3-B, and the sub-anti-reflection layer 10 includes a third sub-anti-reflection layer 15, and the third sub-anti-reflection layer 15 acts on the red light band and the blue light band.

[0043] The band range on which the third sub-anti-reflection layer 15 acts is relatively wide, and it can simultaneously perform high transmittance and anti-reflection on red light and blue light. In this way, only one sub-anti-reflection layer can achieve the purpose of increasing the transmittance and reducing the reflection of red light and blue light, and there is no need to separately set a single sub-anti-reflection layer for red light and blue light, which helps to optimize the thin and light design of the display module.

[0044] In a feasible implementation manner, as Figure 11 shown, Figure 11 is another structural schematic diagram of the display module provided by the embodiment of the present invention. The light-emitting element 3 further includes a second light-emitting element 14. Among them, the light-emitting efficiency of the second light-emitting element 14 can be greater than that of the first light-emitting element 13. At least part of the sub-anti-reflection layer 10 overlaps with the first light-emitting element 13 and does not overlap with the second light-emitting element 14 in the direction perpendicular to the plane where the substrate 1 is located, and acts on the band of the light emitted by the first light-emitting element 13.

[0045] It should be noted that when the first light-emitting element 13 includes light-emitting elements of two colors, when a single sub-anti-reflection layer 10 only acts on the band of the light emitted by one of the color light-emitting elements, it also satisfies the above limitation of "the sub-anti-reflection layer 10 acts on the band of the light emitted by the first light-emitting element 13".

[0046] In a more specific structure, refer to Figure 11, the first light-emitting element 13 includes a red light-emitting element 3-R and a blue light-emitting element 3-B, and the second light-emitting element 14 includes a green light-emitting element 3-G. In a direction perpendicular to the plane of the substrate 1, the reflective polarizing structure 4 overlaps with the red light-emitting element 3-R and the blue light-emitting element 3-B, and does not overlap with the green light-emitting element 3-G.

[0047] The sub anti-reflection layer 10 includes a first sub anti-reflection layer 11, and the first sub anti-reflection layer 11 acts on the red light band. In a direction perpendicular to the plane of the substrate 1, the first sub anti-reflection layer 11 overlaps with the red light-emitting element 3-R and the blue light-emitting element 3-B, and does not overlap with the green light-emitting element 3-G.

[0048] And / or, the sub anti-reflection layer 10 includes a second sub anti-reflection layer 12, and the second sub anti-reflection layer 12 acts on the blue light band. In a direction perpendicular to the plane of the substrate 1, the second sub anti-reflection layer 12 overlaps with the blue light-emitting element 3-B and the red light-emitting element 3-R, and does not overlap with the green light-emitting element 3-G.

[0049] The reflective polarizing structure 4 is located above the first light-emitting element 13, and has an obvious side effect on the reflection of ambient light in the area where the first light-emitting element 13 is located. In the above structure, the sub anti-reflection layer 10 is patterned, and the sub anti-reflection layer 10 only reduces the reflection of ambient light above the first light-emitting element 13 specifically, and compensates for the side effect brought by the reflection of ambient light by the reflective polarizing structure 4 at the position where the first light-emitting element 13 is located. In this way, the reflectivity of the display module to ambient light at different positions can tend to be consistent, and the reflection uniformity at different positions is optimized.

[0050] In a feasible implementation manner, the second anti-reflection layer 9 includes at least one sub anti-reflection layer 10, and at least part of the sub anti-reflection layer 10 acts on the entire visible light band.

[0051] That is, as Figure 12 shown, Figure 12 is another schematic structural diagram of the display module provided by the embodiment of the present invention. The sub anti-reflection layer 10 includes a fourth sub anti-reflection layer 16, and the fourth sub anti-reflection layer 16 acts on the entire visible light band. Inside the cover plate 6, the fourth sub anti-reflection layer 16 can effectively reduce the reflection of ambient light within the entire wavelength range that can be perceived by the human eye, and reduce the reflectivity of ambient light in each band.

[0052] In a feasible implementation manner, referring to Figures 7 - 12 , the display module further includes an adhesive layer 17, and the adhesive layer 17 is located between the cover plate 6 and the first polarizing structure 5. The second anti-reflection layer 9 includes at least one sub anti-reflection layer 10, wherein a sub anti-reflection layer 10 is included between the adhesive layer 17 and the cover plate 6, and / or a sub anti-reflection layer 10 is included between the adhesive layer 17 and the first polarizing structure 5.

[0053] Exemplarily, a first sub - anti - reflection layer 11 is included between the adhesive layer 17 and the cover plate 6, and / or a second sub - anti - reflection layer 12 is included between the adhesive layer 17 and the first polarizing structure 5. Or, a second sub - anti - reflection layer 12 is included between the adhesive layer 17 and the cover plate 6, and / or a first sub - anti - reflection layer 11 is included between the adhesive layer 17 and the first polarizing structure 5.

[0054] In the process of manufacturing the display module, the first polarizing structure 5, the reflective polarizing structure 4, and the quarter - wave plate 7 are usually attached to one side of the light - emitting device layer 2 as a whole. Therefore, when the sub - anti - reflection layer 10 is arranged on the inner side of the cover plate 6, the sub - anti - reflection layer 10 can be arranged above the first polarizing structure 5, that is, on the upper and lower sides of the adhesive layer 17, so as to avoid affecting the lamination process of the polarizing structure.

[0055] In a feasible implementation manner, as Figure 13 shown, Figure 13 is another schematic structural diagram of the display panel provided by the embodiment of the present invention. The display module further includes a light - absorbing layer 18, and the light - absorbing layer 18 is located on the side of the cover plate 6 close to the substrate 1.

[0056] The light - absorbing layer 18 has an absorption effect on light, and can absorb the ambient light entering the display module, thereby reducing the reflection of the metal in the display panel to the ambient light. In the embodiment of the present invention, the light - emitting device layer 2 includes an anode 21, and the light - absorbing layer 18 can be specifically located between the reflective polarizing structure 4 and the anode 21, so that the ambient light is greatly absorbed by the light - absorbing layer 18 before reaching the anode 21, and is prevented from being reflected out of the module by the anode 21.

[0057] By arranging the light - absorbing layer 18 in the display module, the light - absorbing layer 18 can cooperate with the anti - reflection layer to further reduce the reflection of the display module to the ambient light, and thus make the integrated black effect and outdoor readability of the display module better.

[0058] In a feasible implementation manner, referring again to Figure 13 , the light - absorbing layer 18 includes a first light - absorbing layer 19, and the first light - absorbing layer 19 is located between the reflective polarizing structure 4 and the light - emitting device layer 2, specifically between the quarter - wave plate 7 and the light - emitting device layer 2. The first light - absorbing layer 19 includes a first opening 20, and in the direction perpendicular to the plane of the substrate 1, the first opening 20 overlaps with the light - emitting element 3.

[0059] The light - absorbing layer 18 is generally formed by photolithography. Considering from the perspective of the manufacturing process, placing the first light - absorbing layer 19 below the reflective polarizing structure 4, the manufacturing process of the first light - absorbing layer 19 can be between the light - emitting device layer 2 and the polarizing structure, and the process will be more convenient.

[0060] In a feasible implementation manner, referring to Figure 13, in a direction perpendicular to the plane where the substrate 1 is located, the orthographic projection of the light-emitting element 3 is located within the orthographic projection of the first opening 20, and the distance d1 between the orthographic projection of the edge of the first opening 20 on the plane where the substrate 1 is located and the orthographic projection of the edge of the light-emitting element 3 on the plane where the substrate 1 is located is greater than 0 and less than or equal to 10 μm.

[0061] Among them, the light-emitting device layer 2 specifically includes an anode 21, a pixel definition layer 22, a light-emitting layer 23, and a cathode 24. The pixel definition layer 22 includes a second opening 25, and the light-emitting layer 23 is located within the second opening 25. The orthographic projection of the edge of the above-mentioned light-emitting element 3 on the plane where the substrate 1 is located can be regarded as the orthographic projection of the edge of the second opening 25 on the plane where the substrate 1 is located. That is, the distance d1 between the edge of the first opening 20 and the edge of the light-emitting element 3 can also be understood as the distance between the edge of the first opening 20 and the edge of the second opening 25.

[0062] The orthographic projection of the light-emitting element 3 is located within the orthographic projection of the first opening 20, and the distance between the edge of the first opening 20 and the edge of the light-emitting element 3 is greater than 0, which can prevent the first light-absorbing layer 19 from blocking the light-emitting element 3, thereby avoiding affecting the normal light emission of the light-emitting element 3. At the same time, by setting the distance between the edge of the first opening 20 and the edge of the light-emitting element 3 to be less than or equal to 10 μm, it is also possible to prevent the first opening 20 from being too large and ensure that the first light-absorbing layer 19 has a large coverage area, ensuring that the first light-absorbing layer 19 absorbs more incident ambient light and reducing the reflectivity of the display module to a greater extent.

[0063] In a feasible implementation manner, refer to Figure 13 , the display module further includes a touch electrode 27, and the touch electrode 27 is located between the first light-absorbing layer 19 and the light-emitting device layer 2. More specifically, the display module includes a touch layer 28, the touch layer 28 is located between the light-emitting device layer 2 and the first light-absorbing layer 19, the touch layer 28 includes a touch electrode 27 and a cross-bridge 29, and the film layer where the touch electrode 27 is located can be on the side away from the substrate 1 of the film layer where the cross-bridge 29 is located. Among them, the touch electrode 27 can be a metal mesh structure, and the mesh holes of the touch electrode 27 expose the light-emitting element 3.

[0064] In a direction perpendicular to the plane where the substrate 1 is located, the first light-absorbing layer 19 overlaps with the touch electrode 27, thereby using the first light-absorbing layer 19 to reduce the amount of ambient light incident on the touch electrode 27 and reflected by the touch electrode 27.

[0065] In a feasible implementation, the film thickness of the first light-absorbing layer 19 is less than or equal to 5 μm, that is, the thickness of the first light-absorbing layer 19 in the direction perpendicular to the plane where the substrate 1 is located is less than or equal to 5 μm. First, it is to avoid the first light-absorbing layer 19 being too thick and affecting the attachment of the polarization structure or the flatness of the polarization structure. Second, it is to avoid the first light-absorbing layer 19 being too thick and affecting the light output at a large viewing angle.

[0066] In a feasible implementation, the reflectivity of the first light-absorbing layer 19 is less than 5%.

[0067] Currently, the reflectivity of the conventional light-absorbing structure is above 9%. In the embodiment of the present invention, the reflectivity of the first light-absorbing layer 19 is less than 5%, which has a low reflection characteristic and can further reduce the reflection of the display module to the ambient light. Among them, the reflectivity of the first light-absorbing layer 19 can be achieved by adjusting the n and k values of the light-absorbing material used in the first light-absorbing layer 19. n is the refractive index of the material, and k is the absorption coefficient of the material. The two can jointly affect the reflectivity of the material.

[0068] In a feasible implementation, as Figure 14 shown, Figure 14 is another schematic structural diagram of the display panel provided by the embodiment of the present invention. The light-emitting device layer 2 includes an anode 21, a pixel definition layer 22, a light-emitting layer 23, and a cathode 24. Among them, the pixel definition layer 22 includes a second opening 25, and the light-emitting layer 23 is located in the second opening 25.

[0069] The light-absorbing layer 18 includes a second light-absorbing layer 26, and the pixel definition layer 22 includes a light-absorbing material and is multiplexed as the second light-absorbing layer 26.

[0070] In this structure, the original film layer in the display panel can be used to play a light-absorbing role, thereby further reducing the reflectivity of the display module.

[0071] Furthermore, the pixel definition layer 22 at least has a matte surface. Exemplarily, the pixel definition layer 22 includes a matte ink material.

[0072] On the one hand, the matte surface can increase the adhesion between the film layers. On the other hand, compared with the bright surface, the matte surface has less light reflection. Therefore, when the pixel definition layer 22 has a matte surface, the reflection of the pixel definition layer 22 to the incident ambient light can be reduced, and the reflectivity of the display module can be further reduced.

[0073] In a feasible implementation, refer to Figure 13 and Figure 14, the display module further includes a touch electrode 27, which is located between the reflective polarizing structure 4 and the light-emitting device layer 2, for example, between the first light-absorbing layer 19 and the light-emitting device layer 2. The touch electrode 27 includes a black metal, where the black metal may include iron, manganese, chromium, etc., so that the touch electrode 27 also has light-absorbing characteristics, further reducing the reflection of ambient light by the metal inside the display module and making the reflectivity of the display module reach a lower level.

[0074] In a feasible implementation, the reflectivity of the display module is less than 5%, for example, it can be lower than 4.8%.

[0075] Combined with the description of the display module in the related art, in the related art, when the display module does not include a reflective polarizing structure, although it has a lower reflectivity, its light extraction efficiency is also lower. When the display module includes a reflective polarizing structure, although its light extraction efficiency can be improved, the reflective polarizing structure causes a very high reflectivity of the display module.

[0076] In the embodiment of the present invention, the display module includes a reflective polarizing structure 4 and an anti-reflection structure (such as including a first anti-reflection layer 8, a second anti-reflection layer 9, and a light-absorbing layer 18, etc.). Therefore, while using the reflective polarizing structure 4 to improve the light extraction efficiency of the display module, the anti-reflection structure can be further used to reduce the reflectivity of the display module, offsetting the side effect of reflection brought by the reflective polarizing structure 4. In the embodiment of the present invention, the reflectivity of the display module is lower than 5%, which can be equal to or lower than the reflectivity of the display module in the related art that does not include a reflective polarizing structure. The display module can achieve a good integrated black effect and outdoor readability.

[0077] In a feasible implementation, as Figure 15 and Figure 16 shown, Figure 15 is a schematic structural diagram of a cover plate 6 provided by an embodiment of the present invention, Figure 16 is another schematic structural diagram of the cover plate provided by an embodiment of the present invention. The side of the cover plate 6 away from and / or close to the substrate 1 has an anti-glare surface 30, and the anti-glare surface 30 includes a plurality of microstructures 31.

[0078] Among them, the microstructures 31 can reduce glare by changing the propagation direction and scattering mode of light. When ambient light enters the cover plate 6, the anti-glare surface 30 can convert the specular reflection of light into diffuse reflection, dispersing the originally concentrated reflected light in different directions, effectively preventing the glare phenomenon, reducing the interference of glare to the human eye, and improving visual comfort and clarity.

[0079] Among them, the microstructures 31 have a first cross-section perpendicular to the plane where the substrate 1 is located. The first cross-section of the microstructures 31 can have various shapes. For example, refer to Figure 15 andFigure 16 , the first cross-section of at least part of the microstructure 31 is triangular, or, as Figure 17 shown, Figure 17 is another schematic structural view of the cover plate provided by the embodiment of the present invention, and the first cross-section of at least part of the microstructure 31 is square or the like.

[0080] In a feasible implementation manner, in the direction perpendicular to the plane where the substrate 1 is located, the height of the microstructure 31 is greater than or equal to 10 nm and less than or equal to 50 nm. In this way, the haze of the display module can be reduced, and the clarity and contrast of the image displayed by the display module can be improved.

[0081] In a feasible implementation manner, as Figure 18 shown, Figure 18 is another schematic structural view of the cover plate provided by the embodiment of the present invention. The heights of at least part of the microstructures 31 are different in the direction perpendicular to the plane where the substrate 1 is located, and / or the microstructures 31 have a first cross-section perpendicular to the plane where the substrate 1 is located, and the shapes of the first cross-sections of at least part of the microstructures 31 are different. Exemplarily, the microstructures 31 adopt an interpenetrating design with different shapes and different heights.

[0082] This kind of differential design between multiple microstructures 31 can reduce the glare and at the same time reduce the interference of moiré patterns.

[0083] In a feasible implementation manner, in order to reduce the reflection of the cover plate 6, the reflectivity of the anti-glare surface 30 can also be set to be less than 2.5%.

[0084] Based on the same inventive concept, the embodiment of the present invention also provides a display device, as Figure 19 shown, Figure 19 is a schematic structural view of the display device provided by the embodiment of the present invention. The display device includes the above-mentioned display module 100. Of course, Figure 19 the display device shown is only for schematic illustration, and the display device can be any electronic device with a display function such as a mobile phone, a tablet computer, a notebook computer, an e-book or a television.

[0085] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the scope of protection of the present invention.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A display module, characterized in that, Comprising: A substrate; A light-emitting device layer located on one side of the substrate, including a plurality of light-emitting elements; A reflective polarizing structure located on the side of the light-emitting device layer away from the substrate; A first polarizing structure located on the side of the reflective polarizing structure away from the substrate; A cover plate located on the side of the first polarizing structure away from the substrate; The display module further comprises: A first anti-reflection layer located on the side of the cover plate away from the substrate, and the first anti-reflection layer acts on the entire visible light band; A second anti-reflection layer located between the cover plate and the light-emitting device layer.

2. The display module according to claim 1, wherein: The second anti-reflection layer includes at least one sub anti-reflection layer, and the range of the band on which at least part of the sub anti-reflection layer acts is smaller than the range of the entire visible light band.

3. The display module according to claim 2, wherein: The reflectivity of the first anti-reflection layer to light in the first band is greater than the reflectivity to light in the second band, and at least part of the sub anti-reflection layer acts on the first band.

4. The display module according to claim 3, wherein: The first band includes the blue light band.

5. The display module according to claim 2, wherein: The light-emitting element includes a first light-emitting element. In the direction perpendicular to the plane where the substrate is located, the reflective polarizing structure at least overlaps with the first light-emitting element, and at least part of the sub anti-reflection layer acts on the band of the light emitted by the first light-emitting element.

6. The display module according to claim 5, wherein: The first light-emitting element includes a red light-emitting element, the sub anti-reflection layer includes a first sub anti-reflection layer, and the first sub anti-reflection layer acts on the red light band; And / or, the first light-emitting element includes a blue light-emitting element, the sub anti-reflection layer includes a second sub anti-reflection layer, and the second sub anti-reflection layer acts on the blue light band.

7. The display module according to claim 5, wherein: The first light-emitting element includes a red light-emitting element and a blue light-emitting element, the sub anti-reflection layer includes a third sub anti-reflection layer, and the third sub anti-reflection layer acts on the red light band and the blue light band.

8. The display module according to claim 5, wherein: The light-emitting element further includes a second light-emitting element; At least part of the sub anti-reflection layer overlaps with the first light-emitting element and does not overlap with the second light-emitting element in the direction perpendicular to the plane where the substrate is located, and acts on the band of the light emitted by the first light-emitting element.

9. The display module according to claim 1, wherein: The second anti-reflection layer includes at least one sub anti-reflection layer, and at least part of the sub anti-reflection layer acts on the entire visible light band.

10. The display module according to claim 1, wherein: The display module further includes an adhesive layer, and the adhesive layer is located between the cover plate and the first polarizing structure; The second anti-reflection layer includes at least one sub anti-reflection layer, wherein the sub anti-reflection layer is included between the adhesive layer and the cover plate, and / or the sub anti-reflection layer is included between the adhesive layer and the first polarizing structure.

11. The display module according to claim 1, wherein: The display module further includes a light-absorbing layer, and the light-absorbing layer is located on a side of the cover plate close to the substrate.

12. The display module according to claim 11, wherein the light-absorbing layer includes a first light-absorbing layer, the first light-absorbing layer is located between the reflective polarizing structure and the light-emitting device layer, the first light-absorbing layer includes a first opening, and in a direction perpendicular to a plane where the substrate is located, the first opening overlaps with the light-emitting element.

13. The display module according to claim 12, wherein in a direction perpendicular to a plane where the substrate is located, a positive projection of the light-emitting element is located within a positive projection of the first opening, and a distance between a positive projection of an edge of the first opening on the plane where the substrate is located and a positive projection of an edge of the light-emitting element on the plane where the substrate is located is greater than 0 and less than or equal to 10 μm.

14. The display module according to claim 12, wherein the display module further includes a touch electrode, and the touch electrode is located between the first light-absorbing layer and the light-emitting device layer; in a direction perpendicular to a plane where the substrate is located, the first light-absorbing layer overlaps with the touch electrode.

15. The display module according to claim 12, wherein a film thickness of the first light-absorbing layer is less than or equal to 5 μm.

16. The display module according to claim 12, wherein a reflectivity of the first light-absorbing layer is less than 5%.

17. The display module according to claim 11, wherein the light-emitting device layer includes an anode, a pixel defining layer, a light-emitting layer, and a cathode, wherein the pixel defining layer includes a second opening, and the light-emitting layer is located within the second opening; the light-absorbing layer includes a second light-absorbing layer, and the pixel defining layer includes a light-absorbing material and is multiplexed as the second light-absorbing layer.

18. The display module according to claim 17, wherein the pixel defining layer has at least a matte surface.

19. The display module according to claim 1, wherein the display module further includes a touch electrode, the touch electrode is located between the reflective polarizing structure and the light-emitting device layer, and the touch electrode includes a black metal.

20. The display module according to claim 1, wherein a reflectivity of the display module is less than 5%.

21. The display module according to claim 1, wherein a side of the cover plate away from and / or close to the substrate has an anti-glare surface, and the anti-glare surface includes a plurality of microstructures.

22. The display module according to claim 21, wherein in a direction perpendicular to a plane where the substrate is located, a height of the microstructures is greater than or equal to 10 nm and less than or equal to 50 nm.

23. The display module according to claim 21, wherein heights of at least some of the microstructures are different in a direction perpendicular to a plane where the substrate is located; and / or, the microstructures have a first cross-section, the first cross-section is perpendicular to a plane where the substrate is located, and shapes of the first cross-sections of at least some of the microstructures are different.

24. The display module according to claim 21, wherein the reflectivity of the anti-glare surface is less than 2.5%.

25. A display device, characterized in that, Comprising the display module according to any one of claims 1 to 24.

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