Display panel and display device

Abstract

The application discloses a display panel and a display device. The display panel comprises a first light shielding layer and a second light shielding layer. The first light shielding layer comprises alignment marks. The second light shielding layer is arranged on the side of the first light shielding layer away from the display side of the display panel. The transmittance of the second light shielding layer to infrared light is greater than that of the first light shielding layer to infrared light. Infrared alignment light can penetrate the second light shielding layer and reach the first light shielding layer. The infrared alignment light is effectively blocked by the first light shielding layer and forms a difference in reflection or absorption. Therefore, the infrared alignment system can clearly identify the alignment marks on the first light shielding layer through the second light shielding layer, accurately capture the alignment signal, ensure the alignment accuracy of the first light shielding layer and the second light shielding layer, avoid the unintended reduction or deviation of the light-emitting opening, and thus the display effect of the display panel can be improved.

Description

Technical Field

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

[0002] Privacy display technology controls the light emission angle by adding a privacy structure inside the display panel, thereby reducing the visible range and preventing side peeping. A common privacy design involves sequentially setting a privacy black matrix and a display black matrix on the color filter substrate, forming a double-layer black matrix superposition structure. The privacy black matrix forms the privacy grating, while the display black matrix defines the light-blocking area for each sub-pixel. In this structure, the relative positional accuracy between the privacy black matrix and the display black matrix directly determines the effective light emission opening size of the privacy display, thus affecting the panel's display brightness and privacy effect. In other words, the alignment accuracy of the double-layer black matrix is ​​directly related to the light emission efficiency of the privacy design. In current color filter manufacturing processes, the privacy black matrix pattern is typically prepared first, then a thick planarization layer is coated on the privacy black matrix, and finally, the display black matrix is ​​prepared on the planarization layer. The photolithographic patterning process of the display black matrix requires alignment based on the pre-reserved alignment marks on the privacy black matrix. Existing alignment methods mainly include two types: transmission and reflection. Both are based on the principle of using an optical system to collect the difference in light intensity reflected or transmitted by the alignment mark to achieve position identification.

[0003] However, in actual manufacturing processes, the alignment system cannot detect the alignment marks because they are covered by a display black matrix. If the alignment mark detection fails or is not precise enough, it directly causes an overlay misalignment between the display black matrix and the privacy black matrix, drastically reducing the alignment accuracy between the two layers. This deterioration in alignment accuracy leads to unexpected reduction or shifting of the light-emitting opening defined by the privacy shielding layer and the display shielding layer within the display area, resulting in a loss of panel aperture ratio, significantly reduced product brightness, and severely impacting normal display performance.

[0004] Therefore, it is necessary to provide a display panel and display device to improve this deficiency. Summary of the Invention

[0005] This application provides a display panel and display device to solve the problem of poor alignment accuracy of two-layer black matrix.

[0006] To achieve the above objectives, according to a first aspect of this application, a display panel is provided, comprising: The first light-shielding layer includes alignment marks; The second light-shielding layer is disposed on the side of the first light-shielding layer away from the display side of the display panel; The second light-shielding layer has a higher transmittance in the infrared band than the first light-shielding layer in the same infrared band.

[0007] Optionally, the display panel has a display area, the first light-shielding layer has a plurality of first openings located in the display area, the second light-shielding layer has a second opening located in the display area and opposite to the first openings, and the display panel further includes a color filter layer, the color filter layer including a plurality of filter portions, the filter portions being disposed in corresponding second openings.

[0008] Optionally, the first light-shielding layer has a transmittance of less than or equal to 10% in the infrared band, and the second light-shielding layer has a transmittance of greater than or equal to 90% in the infrared band.

[0009] Optionally, the optical density of the first light-shielding layer in the infrared band is greater than the optical density of the second light-shielding layer in the infrared band.

[0010] Optionally, the light density of the first light-shielding layer in the infrared band is greater than 1, and the light density of the second light-shielding layer in the infrared band is less than 0.046.

[0011] Optionally, the light density of the first light-shielding layer in the visible light band is greater than that of the second light-shielding layer in the visible light band, wherein the wavelength of the visible light is greater than or equal to 400 nanometers and less than or equal to 700 nanometers.

[0012] Optionally, the light density of the first light-shielding layer in the visible light band is greater than or equal to 3.7, and the light density of the second light-shielding layer in the visible light band is greater than or equal to 1.5.

[0013] Optionally, the thickness of the first light-shielding layer is greater than or equal to the thickness of the second light-shielding layer.

[0014] Optionally, the ratio of the thickness of the first light-shielding layer to the thickness of the second light-shielding layer is greater than or equal to 1.5.

[0015] Optionally, the thickness of the second light-shielding layer is greater than or equal to 2 micrometers.

[0016] Optionally, the material of the first light-shielding layer includes carbon black; and / or, the material of the second light-shielding layer includes an organic black dye.

[0017] Optionally, the wavelength of the infrared light is greater than 700 nanometers and less than or equal to 1500 nanometers.

[0018] According to a second aspect of this application, a display device is provided, including a display panel as described above.

[0019] In the display panel of this application, by making the transmittance of the second light-shielding layer to infrared light greater than that of the first light-shielding layer to infrared light, during the photolithographic patterning process of preparing the second light-shielding layer, because the second light-shielding layer has a higher transmittance to infrared light, the infrared alignment light can penetrate the second light-shielding layer and reach the first light-shielding layer. Because the first light-shielding layer has a lower transmittance to infrared light, the infrared alignment light is effectively blocked by the first light-shielding layer and forms a difference in reflection or absorption. Therefore, the infrared alignment system can clearly identify the alignment marks on the first light-shielding layer through the second light-shielding layer, accurately capture the alignment signal, ensure the alignment accuracy of the first light-shielding layer and the second light-shielding layer, and avoid the light-emitting opening from shrinking or shifting unexpectedly, thereby improving the display effect of the display panel.

[0020] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0023] Figure 1 A top view of a display panel provided for an embodiment of this application; Figure 2 A schematic diagram of the film layer structure of the display area of ​​a display panel provided for an embodiment of this application; Figure 3 A schematic diagram of the film layer structure of the color filter substrate in the non-display area of ​​the display panel provided for embodiments of this application; Figure 4 Transmittance curves of carbon black and organic black dyes at different wavelengths; Figure 5 A schematic diagram of the infrared alignment principle provided for embodiments of this application; Figure 6 This is a schematic diagram of the structure of a display device provided in an embodiment of this application. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0025] An embodiment of this application provides a display panel, which includes a first light-shielding layer and a second light-shielding layer. The first light-shielding layer includes alignment marks, and the second light-shielding layer is disposed on the side of the first light-shielding layer away from the display side of the display panel. The transmittance of the second light-shielding layer to infrared light is greater than that of the first light-shielding layer to infrared light.

[0026] In the embodiments of this application, by making the transmittance of the second light-shielding layer to infrared light greater than that of the first light-shielding layer, an infrared alignment system can be used for alignment during the photolithographic patterning process of fabricating the second light-shielding layer. Because the second light-shielding layer has higher transmittance to infrared light, the infrared alignment light can penetrate the second light-shielding layer and reach the plane where the first light-shielding layer is located. Because the first light-shielding layer has lower transmittance to infrared light, the infrared alignment light is effectively blocked when it illuminates the area where the first light-shielding layer is located, while it can pass through areas where the first light-shielding layer is not present. Therefore, the infrared alignment system can clearly detect the infrared intensity difference pattern formed by the alignment marks on the first light-shielding layer through the second light-shielding layer. The signal of the alignment marks will not be attenuated or disappear due to the coverage of the planarization layer, thus accurately capturing the alignment signal. Therefore, the problem of alignment mark capture failure or insufficient capture accuracy caused by the planarization layer filling the alignment marks can be effectively solved, ensuring the alignment accuracy of the first and second light-shielding layers.

[0027] The technical solutions defined in the claims are described in detail below with reference to the accompanying drawings.

[0028] Please see Figure 1 , Figure 1 This is a top view of a display panel provided in an embodiment of this application. The display panel 100 has a display area AA and a non-display area NA adjacent to the display area AA. The display area AA is the area used to display a screen, and the non-display area NA is located around the display area AA. The non-display area NA is the area used to place peripheral circuits and wiring. The peripheral circuits may include, but are not limited to, gate drive circuits.

[0029] Please see Figure 2 , Figure 2This is a schematic diagram of the film layer structure of the display area of ​​the display panel provided in the embodiment of this application. The display panel 100 is a liquid crystal display panel. The display panel 100 includes a color filter substrate 1, an array substrate 2 disposed opposite to the color filter substrate 1, a liquid crystal layer 3 disposed between the color filter substrate 1 and the array substrate 2, a sealant 4 disposed between the four edges of the array substrate 2 and the color filter substrate 1, and a support column 5 disposed between the array substrate 2 and the color filter substrate 1.

[0030] In some embodiments, please refer to Figure 2 The color filter substrate 1 includes a first substrate 10, a first light-shielding layer 11 disposed on the side of the first substrate 10 near the array substrate 2, a first planarization layer 13 covering the first light-shielding layer 11 and the first substrate 10, a second light-shielding layer 12 disposed on the side of the first planarization layer 13 away from the first light-shielding layer 11, and a second planarization layer 15 disposed on the side of the second light-shielding layer 12 away from the first planarization layer 13.

[0031] In some embodiments, please refer to Figure 2 The first light-shielding layer 11 has a plurality of first light-shielding portions 111 located in the display area AA and a first opening 112 located between adjacent first light-shielding portions 111. The second light-shielding layer 12 has a second opening 122 located in the display area AA and opposite to the first opening 112, and a second light-shielding portion 121 located between adjacent second openings 122. The display panel 100 also includes a color filter layer 14, which includes a plurality of filter portions 140. The plurality of filter portions 140 may include a red filter portion, a green filter portion, and a blue filter portion, and each filter portion 140 is disposed within a corresponding second opening 122.

[0032] In some embodiments, please refer to Figure 2 The first light-shielding layer 11 serves as the upper light-shielding layer and privacy light-shielding layer of the display panel 100. It can block large-angle light passing through the second opening 122 and the filter 140, allowing only small-angle light to escape from the first opening 112, thus giving the display panel 100 a smaller viewing angle and achieving a privacy effect. The second light-shielding layer 12 serves as the lower light-shielding layer and display light-shielding layer of the display panel 100. The second light-shielding part 121 is disposed between adjacent filter parts 140, which can prevent color mixing between sub-pixels of different colors.

[0033] In some embodiments, please refer to Figure 2The size of the first opening 112 is less than or equal to the size of the second opening 122. It should be noted that the size of the first opening 112 refers to its width W1, and the size of the second opening 122 refers to its width W2. By making the width W1 of the first opening 112 less than or equal to the width W2 of the second opening 122, it can be ensured that the first light-shielding portion 111 of the first light-shielding layer 11 can effectively cover the edge area of ​​the second opening 122 in the thickness direction of the display panel 100. This blocks large-angle light passing through the second opening 122 and the filter portion 140, allowing only small-angle light to escape from the first opening 112, thus giving the display panel 100 a smaller viewing angle and achieving a privacy protection effect.

[0034] Please see Figure 3 , Figure 3 This is a schematic diagram of the film structure of the color filter substrate in the non-display area of ​​a display panel provided in an embodiment of this application. The first light-shielding layer 11 includes an alignment mark 113, which is disposed in the non-display area NA. The alignment mark 113 is used to provide an alignment reference for the subsequent photolithographic patterning process of the second light-shielding layer 12. The alignment mark 113 may be formed synchronously with the rest of the pattern of the first light-shielding layer 11 through the same photolithographic process during the fabrication of the first light-shielding layer 11. Therefore, the material of the alignment mark 113 is the same as the material of the rest of the first light-shielding layer 11.

[0035] In some embodiments, the alignment mark 113 may be in the shape of a cross, L, rectangle, circle or other shape suitable for identification by an optical alignment system, and there is no limitation herein.

[0036] In some embodiments, the transmittance of the second light-shielding layer 12 in the infrared band is greater than that of the first light-shielding layer 11 in the infrared band. By making the transmittance of the second light-shielding layer 12 in the infrared band greater than that of the first light-shielding layer in the infrared band, an infrared alignment system can be used for alignment during the photolithographic patterning process for fabricating the second light-shielding layer. Because the second light-shielding layer has higher transmittance for infrared light, infrared alignment light can penetrate the second light-shielding layer and reach the plane where the first light-shielding layer is located; because the first light-shielding layer has lower transmittance for infrared light, the infrared alignment light is effectively blocked when it illuminates the area where the first light-shielding layer is located, while in areas where the first light-shielding layer is not present, the infrared alignment light can pass through. Therefore, the infrared alignment system can clearly detect the infrared intensity difference pattern formed by the alignment marks on the first light-shielding layer through the second light-shielding layer. The signal of the alignment marks will not be attenuated or disappeared due to the coverage of the planarization layer, thereby accurately capturing the alignment signal. Therefore, it can effectively solve the problem of alignment mark capture failure or insufficient capture accuracy caused by the flattening layer filling the alignment mark, and ensure the alignment accuracy of the first light-shielding layer and the second light-shielding layer.

[0037] In some embodiments, the wavelength of the infrared light is greater than 700 nanometers and less than or equal to 1500 nanometers. For example, the wavelength of the infrared light can be 750 nanometers, 800 nanometers, 900 nanometers, 1100 nanometers, 1300 nanometers, or 1500 nanometers, etc.

[0038] In some embodiments, the transmittance of the first light-shielding layer 11 in the infrared band is less than or equal to 10%, and the transmittance of the second light-shielding layer 12 in the infrared band is greater than or equal to 90%.

[0039] It should be noted that, for infrared light, the transmittance of the first light-shielding layer 11 is less than or equal to 10%, meaning that the first light-shielding layer 11 has extremely strong blocking ability against infrared light. At least 90% of the infrared alignment light is absorbed or reflected by the first light-shielding layer 11, and only a very small amount of infrared light can penetrate the first light-shielding layer 11. The transmittance of the second light-shielding layer 12 is greater than or equal to 90%, meaning that the second light-shielding layer 12 is almost transparent to infrared light, and at least 90% of the infrared alignment light can directly penetrate the second light-shielding layer 12. Based on the above infrared optical characteristics, when infrared alignment light is incident from the side of the second light-shielding layer 12, at the location where the first light-shielding layer 11 is provided, the infrared alignment light, after penetrating the high-transmittance second light-shielding layer 12, illuminates the low-transmittance first light-shielding layer 11, and the infrared light is effectively blocked by the first light-shielding layer 11; while in the area where the first light-shielding layer 11 is not provided, the infrared alignment light can penetrate the second light-shielding layer 12 and continue to transmit. These two situations create a significant difference in light intensity signal on the detector of the infrared alignment system, and the pattern of alignment mark 113 can be presented in the infrared image in a high-contrast manner.

[0040] In this way, even if the second light-shielding layer 12 covers the alignment mark 113, the infrared alignment light can still penetrate the second light-shielding layer 12 and clearly detect the pattern of the alignment mark 113 on the first light-shielding layer 11. The signal of the alignment mark 113 will not be attenuated or lost due to the coverage of the second light-shielding layer 12, and the infrared alignment system can accurately capture the alignment signal. Therefore, it can effectively solve the problem of alignment mark capture failure or insufficient capture accuracy caused by the second light-shielding layer blocking the alignment mark in the prior art, ensure the alignment accuracy of the first light-shielding layer 11 and the second light-shielding layer 12, avoid unexpected shrinkage or displacement of the light-emitting opening, and thus improve the display effect of the display panel.

[0041] In some embodiments, the optical density of the first light-shielding layer 11 in the infrared band is greater than the optical density of the second light-shielding layer 12 in the infrared band.

[0042] It should be noted that optical density is a physical quantity that measures a material's ability to block light. Optical density and transmittance are negatively correlated; the higher the optical density value, the stronger the material's ability to absorb light, and the lower the transmittance. Let the optical density be OD and the transmittance be T. The optical density OD and transmittance T satisfy: T = 10. ^（-OD） In this embodiment, the light density of the first light-shielding layer 11 in the infrared light band is greater than that of the second light-shielding layer 12 in the infrared light band. This means that the first light-shielding layer 11 has a stronger light-shielding ability in the infrared light band, and the second light-shielding layer 12 has a higher transmittance to infrared light, so that the infrared alignment light can pass through the second light-shielding layer 12 to capture the alignment mark 113.

[0043] In some embodiments, the optical density of the first light-shielding layer 11 in the infrared band is greater than 1, and the optical density of the second light-shielding layer 12 in the infrared band is less than 0.046. For example, the optical density of the first light-shielding layer 11 in the infrared band can be 1, 1.2, 1.5, 1.8, 2, 2.5, or 3, etc. The optical density of the second light-shielding layer 12 in the infrared band can be 0.046, 0.043, 0.041, 0.04, 0.395, 0.39, etc.

[0044] In some embodiments, the light density of the first light-shielding layer 11 in the visible light band is greater than that of the second light-shielding layer 12 in the visible light band. The wavelength of visible light is greater than or equal to 400 nanometers and less than or equal to 700 nanometers. This allows the first light-shielding layer 11 to have stronger light-shielding ability in the visible light band, thus better achieving the privacy protection function.

[0045] In some embodiments, the optical density of the first light-shielding layer 11 in the visible light band is greater than or equal to 3.7, and the optical density of the second light-shielding layer 12 in the visible light band is greater than or equal to 1.5. For example, the optical density of the first light-shielding layer 11 in the visible light band can be 3.7, 3.9, 4, 4.5, or 5, etc. The optical density of the second light-shielding layer 12 in the visible light band can be 1.5, 1.8, 2, or 2.5, etc.

[0046] It should be noted that the optical density of the first light-shielding layer 11 is greater than or equal to 3.7. Within this range, the first light-shielding layer 11 can effectively block large-angle light rays in the visible light band, ensuring the privacy protection effect. At the same time, the high optical density also means that the first light-shielding layer 11 has a strong blocking effect on infrared light, which is conducive to forming a clear light intensity difference signal in infrared alignment. The optical density of the second light-shielding layer 12 is greater than or equal to 1.5. Within this range, the second light-shielding layer 12 can meet the basic light-shielding requirements of the black matrix for display, effectively preventing color mixing between adjacent sub-pixels. Since the optical density of the second light-shielding layer 12 is relatively low in the infrared light band, its absorption and scattering of infrared light are also relatively weak, which helps the infrared alignment light to penetrate the second light-shielding layer 12 to reach the first light-shielding layer 11, improving the signal strength of infrared alignment.

[0047] Please see Figure 4 , Figure 4 This chart shows the transmittance curves of carbon black and organic black dyes in different wavelength bands. Carbon black is a fine particle composed of carbon elements. It has high optical density in both the visible and infrared wavelength bands, and is almost opaque in both. Organic black dyes have high optical density in the visible wavelength band and possess light-blocking properties comparable to carbon black. However, they have lower optical density in the infrared wavelength band and higher transmittance, exceeding 90%.

[0048] In some embodiments, the first light-shielding layer 11 uses carbon black as the light-shielding material. The first light-shielding layer 11 using carbon black as the light-shielding material can exhibit excellent light-shielding performance in both visible and infrared light bands. It can effectively block visible light to achieve the anti-peeping function, and can also form a clear light intensity difference signal in infrared alignment, which is beneficial to the high contrast recognition of the infrared alignment system.

[0049] The second light-shielding layer 12 uses an organic black dye as the light-shielding material. The selective absorption characteristics of the organic black dye enable the second light-shielding layer 12 to effectively block light in the visible light band to meet the functional requirements of the black matrix for display, while maintaining high transmittance in the infrared band, allowing infrared alignment light to smoothly penetrate the second light-shielding layer 12 and reach the first light-shielding layer 11. Thus, the combination of the carbon black type first light-shielding layer 11 and the organic black dye type second light-shielding layer 12 fundamentally ensures the feasibility of the infrared alignment scheme: the first light-shielding layer 11 effectively blocks infrared light, while the second light-shielding layer 12 is almost transparent to infrared light. The contrast in the optical properties of the two in the infrared band provides sufficient optical signals for the infrared alignment system.

[0050] In some embodiments, please refer to Figure 3 The thickness t1 of the first light-shielding layer 11 is greater than or equal to the thickness t2 of the second light-shielding layer 12.

[0051] It should be noted that the first light-shielding layer 11, as an anti-spy light-shielding layer, needs to have a high light density to effectively block visible light at large angles. Light density is positively correlated with film thickness; under the same or similar material conditions, the thicker the film, the higher the light density. Therefore, ensuring that the thickness t1 of the first light-shielding layer 11 is greater than or equal to the thickness t2 of the second light-shielding layer 12 ensures that the first light-shielding layer 11 has sufficient light density in the visible light band to achieve the anti-spy function.

[0052] In some embodiments, the ratio of the thickness t1 of the first light-shielding layer 11 to the thickness t2 of the second light-shielding layer 12 is greater than or equal to 1.5. For example, the ratio of the thickness t1 of the first light-shielding layer 11 to the thickness t2 of the second light-shielding layer 12 can be 1.5, 1.7, 1.9, 2, 2.2, or 2.5, etc.

[0053] It should be noted that setting the ratio of the thickness t1 of the first light-shielding layer 11 to the thickness t2 of the second light-shielding layer 12 to be greater than or equal to 1.5 means that the thickness of the first light-shielding layer 11 is at least 1.5 times the thickness of the second light-shielding layer 12. The thicker first light-shielding layer 11, while meeting the requirements for privacy protection, also provides stronger blocking of infrared light, making the difference in infrared light intensity between the alignment mark 113 area and the surrounding area more significant, which is beneficial for the infrared alignment system to recognize the mark pattern with high contrast. The thinner second light-shielding layer 12 helps reduce the absorption and scattering of infrared alignment light, allowing more infrared light to penetrate the second light-shielding layer 12 and reach the first light-shielding layer 11, further improving the intensity of the infrared alignment signal.

[0054] In some embodiments, the thickness t2 of the second light-shielding layer 12 is greater than or equal to 2 micrometers.

[0055] according to Figure 4 It is known that the greater the thickness of the second light-shielding layer 12, the greater the optical density in the visible light band and the lower the transmittance in the visible light band. Setting the thickness t2 of the second light-shielding layer 12 to be greater than or equal to 2 micrometers not only ensures sufficient structural continuity and integrity of the second light-shielding layer 12, avoiding defects such as breakage and pinholes in subsequent processes due to excessively thin film layers, but also ensures the light-shielding performance of the second light-shielding layer 12 for visible light, preventing color mixing between adjacent sub-pixels, thereby ensuring the reliability of the display black matrix. In practical applications, the thickness of the second light-shielding layer 12 can also be less than 2 micrometers. For example, the thickness of the second light-shielding layer 12 can be 1 micrometer, 1.2 micrometers, 1.6 micrometers, or 1.8 micrometers, etc. This can also meet the strict requirements of the display black matrix for visible light shielding performance while ensuring effective penetration of infrared alignment light.

[0056] In some embodiments, if the optical density of the second light-shielding layer 12 is greater than or equal to 4, and the thickness t2 is greater than or equal to 2 micrometers, then the second light-shielding layer 12 also has strong light-shielding capability in the visible light band. This can more effectively suppress light leakage and color mixing between adjacent sub-pixels, improving the contrast and color purity of the display panel. It should be noted that although the optical density of the second light-shielding layer 12 is high, because it uses organic black dye as the light-shielding material, its absorption capacity in the infrared band is much lower than its absorption capacity in the visible light band. Therefore, even if the second light-shielding layer 12 has a high visible light optical density, its transmittance for infrared light can still remain at a high level, without affecting the implementation of infrared alignment.

[0057] In some embodiments, the material of the first light-shielding layer 11 includes carbon black, and / or the material of the second light-shielding layer 12 includes an organic black dye.

[0058] In some embodiments, the optical density of the second light-shielding layer 12 in the visible light band is greater than or equal to 4. It should be noted that when the second light-shielding layer 12 uses an organic black dye as the light-shielding material and has a thickness greater than or equal to 2 micrometers, by optimizing the content of the organic black dye and the coating and curing process of the second light-shielding layer 12, the optical density of the second light-shielding layer 12 in the visible light band can reach 4 or higher. An optical density of 4 in the visible light band means that the second light-shielding layer 12 can attenuate the intensity of incident visible light to one ten-thousandth of its original value, exhibiting extremely strong visible light shielding capability. This allows for a balance between the high visible light density and high infrared transmittance of the second light-shielding layer 12, satisfying the stringent requirements of black matrices for visible light shielding performance in displays while ensuring effective penetration of infrared alignment light.

[0059] It should be noted that although organic black dyes exhibit strong absorption characteristics in the visible light band, their molecular structure dictates that their electronic transition energy levels match the energy of visible light photons, but not the energy of infrared light photons. Therefore, their absorption coefficient in the infrared band is much lower than that in the visible light band. Please refer to [link / reference]. Figure 4 When the thickness of the second light-shielding layer 12 is 2 micrometers, the optical density of the second light-shielding layer 12 in the visible light band is 4.12, and its transmittance in the infrared light band is greater than 90%.

[0060] Therefore, it can be seen that even when the visible light density reaches 4, the transmittance of the second light-shielding layer 12 can still be maintained at over 90% for infrared light, without affecting the implementation of infrared alignment. Thus, the second light-shielding layer 12 achieves a balance between high visible light density and high infrared transmittance, satisfying the stringent requirements of the black matrix for visible light shielding performance in displays while ensuring effective penetration of infrared alignment light.

[0061] Please see Figure 5 , Figure 5The schematic diagram of the infrared alignment principle provided in the embodiments of this application shows that the infrared alignment system includes an infrared light source and an infrared detector. In the process of forming the second light-shielding layer 12, the infrared light source emits infrared alignment light from the side of the second light-shielding layer 12 away from the first light-shielding layer 11, and the infrared alignment light illuminates the second light-shielding layer 12. Since the second light-shielding layer 12 has a high transmittance to infrared light, for example, greater than or equal to 90%, most of the infrared alignment light penetrates the second light-shielding layer 12 and continues to pass through the transparent planarization layer 16 to reach the alignment mark 113.

[0062] At the alignment mark 113, because the first light-shielding layer 11 has low transmittance to infrared light, for example, less than or equal to 10%, the infrared alignment light is effectively absorbed or reflected by the alignment mark 113, and the infrared light signal received by the detector is extremely weak. At locations where the first light-shielding layer 11 is not present, the infrared alignment light can penetrate the planarization layer 16 and the second light-shielding layer 12 to continue propagating, and the detector receives a stronger infrared light signal. Thus, the infrared detector displays an alternating bright and dark infrared image corresponding to the pattern of the alignment mark 113. The infrared alignment system accurately calculates the position coordinates of the alignment mark 113 based on this infrared image, and adjusts the exposure position of the subsequent second light-shielding layer 12 accordingly, achieving high-precision alignment between the first light-shielding layer 11 and the second light-shielding layer 12.

[0063] Based on the display panel provided in the above embodiments of this application, embodiments of this application also provide a display device. Please refer to... Figure 6 , Figure 6 The diagram below shows the structure of a display device provided in an embodiment of this application. The display device 1000 includes a display panel 100 and a housing 200. The display panel 100 is disposed on the housing 200. The display panel 100 can be any of the display panels provided in the above embodiments.

[0064] In some embodiments, the display device 1000 may be a liquid crystal display device, in which case the display panel 100 is a liquid crystal display panel, and the display device 1000 may further include a backlight module, with the display panel 100 disposed on the light-emitting side of the backlight module.

[0065] The beneficial effects of the embodiments of this application are as follows: Embodiments of this application provide a display panel and a display device. The display panel includes a first light-shielding layer and a second light-shielding layer. The first light-shielding layer includes alignment marks. The second light-shielding layer is disposed on the side of the first light-shielding layer away from the display side of the display panel. The second light-shielding layer has a higher transmittance of infrared light than the first light-shielding layer. In the photolithographic patterning process for fabricating the second light-shielding layer, an infrared alignment system is used for alignment. Because the second light-shielding layer has a higher transmittance of infrared light, the infrared alignment light can penetrate the second light-shielding layer and reach the first light-shielding layer. Because the first light-shielding layer has a lower transmittance of infrared light, the infrared alignment light is effectively blocked by the first light-shielding layer. Therefore, the infrared alignment system can clearly identify the infrared light intensity difference pattern formed by the alignment marks on the first light-shielding layer through the second light-shielding layer. The signal of the alignment marks will not be attenuated or disappeared due to the coverage of the flat layer, so the alignment signal can be accurately captured, ensuring the alignment accuracy of the first light-shielding layer and the second light-shielding layer, avoiding unexpected shrinkage or displacement of the light-emitting opening, thereby improving the display effect of the display panel.

[0066] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0067] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0068] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0069] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A display panel, characterized in that, include: The first light-shielding layer includes alignment marks; The second light-shielding layer is disposed on the side of the first light-shielding layer away from the display side of the display panel; The second light-shielding layer has a higher transmittance in the infrared band than the first light-shielding layer in the same infrared band.

2. The display panel as described in claim 1, characterized in that, The display panel has a display area, the first light-shielding layer has a plurality of first openings located in the display area, the second light-shielding layer has a second opening located in the display area and opposite to the first openings, and the display panel further includes a color filter layer, the color filter layer includes a filter portion, the filter portion being disposed in the corresponding second opening.

3. The display panel as described in claim 1, characterized in that, The first light-shielding layer has a transmittance of less than or equal to 10% in the infrared band, and the second light-shielding layer has a transmittance of greater than or equal to 90% in the infrared band.

4. The display panel as described in claim 1, characterized in that, The light density of the first light-shielding layer in the infrared band is greater than that of the second light-shielding layer in the infrared band.

5. The display panel as described in claim 4, characterized in that, The first light-shielding layer has an optical density greater than 1 in the infrared band, and the second light-shielding layer has an optical density less than 0.046 in the infrared band.

6. The display panel as described in claim 1, characterized in that, The light density of the first light-shielding layer in the visible light band is greater than that of the second light-shielding layer in the visible light band, wherein the wavelength of the visible light is greater than or equal to 400 nanometers and less than or equal to 700 nanometers.

7. The display panel as described in claim 6, characterized in that, The first light-shielding layer has an optical density greater than or equal to 3.7 in the visible light band, and the second light-shielding layer has an optical density greater than or equal to 1.5 in the visible light band.

8. The display panel as described in claim 1, characterized in that, The thickness of the first light-shielding layer is greater than or equal to the thickness of the second light-shielding layer.

9. The display panel as claimed in claim 1, characterized in that, The ratio of the thickness of the first light-shielding layer to the thickness of the second light-shielding layer is greater than or equal to 1.

5.

10. The display panel as claimed in claim 1, characterized in that, The thickness of the second light-shielding layer is greater than or equal to 2 micrometers.

11. The display panel as claimed in claim 1, characterized in that, The material of the first light-shielding layer includes carbon black; And / or, the material of the second light-shielding layer includes an organic black dye.

12. The display panel as claimed in claim 1, characterized in that, The wavelength of the infrared light is greater than 700 nanometers and less than or equal to 1500 nanometers.

13. A display device, characterized in that, Includes the display panel as described in any one of claims 1 to 12.

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