Display panel, optical module and display equipment

Abstract

The invention relates to a display panel which comprises a first substrate and a second substrate which are oppositely arranged, the second substrate is an array substrate, the first substrate comprises a substrate, and an anti-reflection layer is arranged on the side, facing the second substrate, of the substrate. The invention further relates to an optical module and a display device. The display panel comprises a first substrate and a second substrate which are oppositely arranged, the second substrate and an array substrate, an anti-reflection layer is arranged on the first substrate, the reflectivity of the display panel is reduced, then reflected stray light is reduced, and the picture purity is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of display product manufacturing, and in particular to a display panel, an optical module and a display device. Background Art

[0002] In the optical system, pancake optics (thin optics) equipped with Fast LCD display screens have become the mainstream of the market. Taking the 2 / 4 reflective optical system as an example, assuming that the return process is an ideal model, the film material transmittance is 50%. Due to the manufacturing error of the film material, some images with low brightness and not in the target focal plane appear in the system except the main image, which is called ghost (imaging stray light). In addition, there is some stray light that does not form a ghost, but will reduce the purity of the picture. The appearance of stray light greatly affects the user's viewing experience. Summary of the invention

[0003] In order to solve the above technical problems, the present disclosure provides a display panel, an optical module and a display device to solve the problem that stray light caused by reflection on the panel surface affects the display.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted in the embodiment of the present disclosure is: a display panel includes a first substrate and a second substrate arranged opposite to each other, wherein the second substrate is an array substrate,

[0005] The first substrate comprises a substrate, and an anti-reflection layer is arranged on a side of the substrate facing the second substrate;

[0006] The first substrate further comprises a black matrix layer disposed on the substrate, wherein the black matrix layer comprises a shielding area and an opening area;

[0007] The anti-reflection layer is located between the substrate and the shielding area; or

[0008] The orthographic projection of the anti-reflection layer on the black matrix layer completely covers the black matrix layer.

[0009] Optionally, the anti-reflection layer is a single-layer structure or a multi-layer structure.

[0010] Optionally, the anti-reflection layer is a single-layer structure, and the refractive index n1 of the anti-reflection layer satisfies the following formula: Wherein, n0 is the refractive index of the substrate, n a is the refractive index of the black matrix layer.

[0011] Optionally, the material of the anti-reflection layer is one of germanium oxide, magnesium oxide, silicon nitride and molybdenum oxide.

[0012] Optionally, the anti-reflection layer has a thickness of 40-70 nm.

[0013] Optionally, the anti-reflection layer includes a first anti-reflection film layer and a second anti-reflection film layer stacked in sequence in a direction away from the substrate, and the refractive index n2 of the first anti-reflection film layer and the refractive index n3 of the second anti-reflection film layer satisfy the following formula: Wherein, n0 is the refractive index of the substrate, n a is the refractive index of the black matrix layer, n a Greater than n0.

[0014] Optional,

[0015] The first anti-reflection film layer is made of magnesium oxide material, and the second anti-reflection film layer is made of silicon nitride material;

[0016] The thickness of the first anti-reflection film layer is 5-10 nm, and the thickness of the second anti-reflection film layer is 25-35 nm.

[0017] Optionally, the first anti-reflection film layer is made of germanium oxide material, and the second anti-reflection film layer is made of magnesium oxide material;

[0018] The thickness of the first anti-reflection film layer is 5-10 nm. The thickness of the second anti-reflection film layer is 35-45 nm.

[0019] Optionally, the first anti-reflection film layer is made of magnesium oxide material, and the second anti-reflection film layer is made of molybdenum oxide material;

[0020] The thickness of the first anti-reflection film layer is 5-10 nm, and the thickness of the second anti-reflection film layer is 20-30 nm.

[0021] Optionally, the first substrate is a color filter substrate, the second substrate is an array substrate, the first substrate includes a color resist layer, and the color resist layer includes a color resist unit disposed in the opening area.

[0022] Optionally, the first substrate is a packaging substrate, the second substrate is an array substrate, and the array substrate includes a color resist layer, the color resist layer includes a plurality of color resist units, and the orthographic projection of the color resist unit on the display panel is located within an opening area on the black matrix layer.

[0023] Optionally, the reflectivity of the light emitting surface of the display panel is 0.2%-0.9%.

[0024] The embodiment of the present disclosure further provides an optical module, comprising the above-mentioned display panel and an optical device located on the light emitting side of the display panel.

[0025] The embodiment of the present disclosure also provides a display device, comprising the above-mentioned optical module.

[0026] The beneficial effect of the present disclosure is that the display panel includes a first substrate and a second substrate that are relatively arranged, the second substrate and an array substrate, and an anti-reflection layer is arranged on the first substrate to reduce the reflectivity of the display panel, thereby reducing reflected stray light and improving the purity of the VR picture. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram showing a comparison between the reflectivity of the light shielding area and the reflectivity of the opening area of ​​the black matrix layer;

[0028] Figure 2 A schematic diagram showing a comparison between the reflectivity of a display panel without an anti-reflection layer and the reflectivity of a display panel with an anti-reflection layer;

[0029] Figure 3 A schematic diagram showing a comparison between the reflectivity of a display panel without an anti-reflection layer and the reflectivity of a display panel with an anti-reflection layer;

[0030] Figure 4 A schematic diagram showing a comparison between the reflectivity of a display panel without an anti-reflection layer and the reflectivity of a display panel with an anti-reflection layer;

[0031] Figure 5 A schematic diagram showing a comparison between the reflectivity of a display panel without an anti-reflection layer and the reflectivity of a display panel with an anti-reflection layer;

[0032] Figure 6 A schematic diagram showing a comparison between the reflectivity of a display panel without an anti-reflection layer and the reflectivity of a display panel with an anti-reflection layer;

[0033] Figure 7 A schematic diagram showing a comparison between the reflectivity of a display panel without an anti-reflection layer and the reflectivity of a display panel with an anti-reflection layer;

[0034] Figure 8 A schematic diagram showing a comparison between the reflectivity of a display panel without an anti-reflection layer and the reflectivity of a display panel with an anti-reflection layer;

[0035] Fig. 9 A schematic diagram showing a comparison between the reflectivity of a display panel without an anti-reflection layer and the reflectivity of a display panel with an anti-reflection layer;

[0036] Fig.10 A schematic diagram showing a comparison between the reflectivity of a display panel without an anti-reflection layer and the reflectivity of a display panel with an anti-reflection layer;

[0037] Fig.11 A schematic diagram showing a comparison between the reflectivity of a display panel without an anti-reflection layer and the reflectivity of a display panel with an anti-reflection layer;

[0038] Fig.12A schematic diagram showing a first substrate in an embodiment of the present disclosure;

[0039] Fig.13 A schematic diagram showing a first substrate in an embodiment of the present disclosure;

[0040] Fig.14 A schematic diagram showing a first substrate in an embodiment of the present disclosure;

[0041] Fig.15 A schematic diagram showing a display panel in an embodiment of the present disclosure;

[0042] Fig.16 A schematic diagram showing a display panel in an embodiment of the present disclosure;

[0043] Fig.17 A schematic diagram showing a display panel in an embodiment of the present disclosure;

[0044] Fig.18 A schematic diagram showing the optical path of the main image in the optical module;

[0045] Fig.19 A schematic diagram showing the optical path of direct stray light in an optical module;

[0046] Fig. 20 A schematic diagram showing the optical path of reflected stray light 1 in the optical module;

[0047] Fig.21 Schematic diagram showing the optical path of reflected stray light 2 in the optical module. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0049] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure should be understood by people with ordinary skills in the field to which the present disclosure belongs. The "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one", "one" or "the" do not indicate quantity restrictions, but indicate that there is at least one. Similar words such as "include" or "comprise" mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Similar words such as "connect" or "connected" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0050] The features such as "parallel", "perpendicular", and "same" used in the embodiments of the present disclosure include the features such as "parallel", "perpendicular", and "same" in a strict sense, as well as the cases where "approximately parallel", "approximately perpendicular", "approximately the same", etc. include certain tolerances, taking into account the tolerances associated with the measurement of specific quantities (e.g., the limitations of the measurement system), and represent the acceptable deviation range for a specific value determined by ordinary technicians in the field. For example, "approximately" can mean within one or more standard deviations, or within 3% or 5% of the value.

[0051] The pancake optical system generally includes a display screen 100 and an optical device located at the light-emitting side of the display screen 100. The optical device may include a first lens 200 and a second lens 300. The more serious stray light is generally divided into two categories according to the path formed:

[0052] Category 1: Stray light that passes directly through the optical device and enters the human eye M without any return, that is, direct stray light, refer to Fig.19 ;

[0053] The second category: stray light formed by reflection from the light-emitting surface of the display screen 100, i.e., reflected stray light, refer to Fig. 20 and Fig.21 ;

[0054] Among them: Reference Fig.18 , the main image brightness is: Lmain image=50%*50%=25%, that is, the pancake optical system light effect; wherein the reflectivity of the first lens 200 is 50%, and the reflectivity of the second lens 300 is 50%.

[0055] Reflected stray light is divided into 2 categories, and its intensity is: L stray light 1 = 50% * 50% * 50% * n, reference Fig. 20 ; L stray light 2 = 50% * 50% * 50% * n, reference Fig.21 , that is, the total intensity of reflected stray light = 25%*n, where the reflectivity of the first lens 200 is 50%, the reflectivity of the second lens 300 is 50%, and the reflectivity of the light exiting surface of the display screen 100 is n;

[0056] From the above, we can know that the ratio of reflected stray light to main image energy is the reflectivity n of the light-emitting surface of the display screen;

[0057] The reduction of direct stray light mainly depends on improving the purity of the polarization state of the light output from the display screen and the manufacturing accuracy of film materials such as QWP (quarter wave plate) on the optical lens.

[0058] The reduction of reflected stray light only relies on reducing the reflectivity of the display screen surface. This embodiment mainly aims at reducing the reflected stray light.

[0059] The reduction of reflected stray light mainly relies on reducing the reflectivity of the display screen surface (i.e., the light-emitting surface of the display screen). The disclosed embodiments provide a display panel, an optical module, and a display device, which reduce the reflectivity of the display screen surface by setting an anti-reflection layer in the display panel, thereby reducing the reflected stray light under the optical machine, improving the purity of the picture, reducing the difficulty of designing the optical solution of the whole machine, and improving the consumer experience.

[0060] Specifically, refer to Figure 12-Figure 17 This embodiment provides a display panel, a display panel comprising a first substrate 111 and a second substrate 222 arranged opposite to each other, wherein the second substrate 222 is an array substrate.

[0061] The first substrate 111 includes a substrate 1 , and an anti-reflection layer 2 is disposed on a side of the substrate 1 facing the second substrate 222 .

[0062] A black matrix layer 3 is disposed on the first substrate 111 . The black matrix layer 3 is opaque. In order to reduce the reflectivity of the display panel, the anti-reflection layer 2 is disposed on a side of the black matrix layer 3 close to the substrate 1 .

[0063] The first substrate 111 is a substrate on the light-emitting side, and the second substrate 222 is a substrate on the light-incoming side. The first substrate 111 may be a color filter substrate, in which case the second substrate 222 may be an array substrate, that is, the display panel is a non-COA structure. Alternatively, the first substrate 111 is a packaging substrate, in which case the second substrate 222 may also be a COA (Color Filter on Array) substrate, where a COA substrate refers to a substrate with a color filter layer formed on an array substrate, in which case the display panel is a COA structure.

[0064] The following specifically describes how to arrange the anti-reflection layer 2 in the display panels with non-COA structure and COA structure.

[0065] refer to Figure 12-14 , the display panel is a non-COA structure. The first substrate 111 is a color filter substrate, and the second substrate 222 is a conventional array substrate. A black matrix layer 3 and a color resist layer are arranged on the first substrate 111, the black matrix layer 3 includes a shielding area 31 and an opening area 32, the first substrate 111 includes a color resist layer, and the color resist layer includes a color resist unit 41 arranged in the opening area 32.

[0066] In an exemplary embodiment, the first substrate 111 further includes a black matrix layer 3 disposed on the substrate 1, and the black matrix layer 3 includes a shielding area 31 and an opening area 32; simulation results show that the reflectivity per unit area of ​​the shielding area is higher (e.g. Figure 1 As shown, Figure 1 The simulation curve 10 represents the reflectivity of the shading area, and the simulation curve 20 represents the reflectivity of the opening area 32). Therefore, in some embodiments, the anti-reflection layer 2 is located between the substrate 1 and the shading area 31. Fig.12 , that is, the orthographic projection of the anti-reflection layer 2 on the black matrix layer 3 is located in the shading area.

[0067] In an exemplary embodiment, the anti-reflection layer 2 may be a single-layer structure or a multi-layer structure.

[0068] In an exemplary embodiment, the anti-reflection layer 2 is a single-layer structure. In order to achieve the anti-reflection effect, the refractive index n1 of the anti-reflection layer 2 satisfies the following formula: It uses the principle of destructive interference of light to achieve the anti-reflection effect (in the propagation direction of the light, the anti-reflection layer includes a first surface and a second surface, the light is incident on the first surface from the film layer adjacent to the anti-reflection layer, part of the light is transmitted to form the first transmitted light, part of the light is reflected to form the first reflected light, the light entering the anti-reflection layer reaches the second surface, part of the light is transmitted to form the second transmitted light, part of the light is reflected to form the second reflected light, the crest of the first reflected light coincides with the trough of the second reflected light, or the trough of the first reflected light coincides with the crest of the second reflected light, the first reflected light and the second reflected light can interfere with each other), wherein n0 is the refractive index of the substrate 1, n a is the refractive index of the black matrix layer 3 .

[0069] In an exemplary embodiment, the material of the anti-reflection layer 2 is one of germanium oxide, magnesium oxide, silicon nitride, and molybdenum oxide, but is not limited thereto.

[0070] In an exemplary embodiment, when the material of the anti-reflection layer 2 is germanium oxide, the thickness of the anti-reflection layer 2 is 40-70 nm.

[0071] Through simulation, it is known that in the 380nm-780nm band, the reflectivity of the green light band contributes the most to stray light. Therefore, in the anti-reflection design of the display panel, the green light band is targeted to be reduced, which helps to reduce the intensity of reflected stray light. Therefore, in order to improve the anti-reflection effect, the thickness of the anti-reflection layer 2 is set to 50-60nm.

[0072] The simulation results show that after adding the anti-reflection layer 2 made of germanium oxide, the reflectivity of the light-emitting surface of the display panel is reduced from 1.19% to 0.65%, a decrease of 45% (e.g. Figure 2 As shown, Figure 2 The simulation curve 30 is the reflectivity of the display panel without the anti-reflection layer 2. The simulation curve 40 is the reflectivity of the display panel with the anti-reflection layer 2.

[0073] Through simulation, after providing the anti-reflection layer 2, the total amount of reflected stray light is reduced from 0.87% of the original solution to 0.43%, a reduction of 52%, refer to the following Table 1.

[0074]

[0075] Referring to Table 1 above, the total stray light includes imaging stray light and non-imaging stray light, and the imaging stray light includes reflected stray light and direct stray light. In this embodiment, by setting the anti-reflection layer 2, the reflected stray light is reduced, thereby also reducing the total stray light. The reflected stray light is reduced from 0.87% to 0.43%, and the total stray light is reduced from 2.42% to 1.98%. Due to the presence of stray light, in addition to the main image, there are some images with low brightness and not in the target focal plane in the displayed image, which are called ghost images (i.e., imaging stray light). By setting the anti-reflection layer 2, the imaging stray light is reduced from 1.11% to 0.67%, improving the purity of the image.

[0076] It should be noted that the data in Table 1 above are obtained based on the same signal light. The amount of signal light is 100%, and the proportion in Table 1 is the proportion in the signal light. For example, the proportion of total stray light is 2.42%, which is the proportion of total stray light in the signal light.

[0077] In an exemplary embodiment, in order to improve the anti-reflection effect, the anti-reflection layer 2 is configured as a multi-layer structure. Fig.13 In some embodiments, the anti-reflection layer 2 includes a first anti-reflection film layer 21 and a second anti-reflection film layer 22 stacked in sequence in a direction away from the substrate 1, and the refractive index n2 of the first anti-reflection film layer 21 and the refractive index n3 of the second anti-reflection film layer 22 satisfy the following formula: It utilizes the principle of destructive interference of light to achieve the anti-reflection effect (the light source of the display device is incident on the display panel, a first reflected light is formed on the light incident surface of the first anti-reflection film layer 21, a second reflected light is formed on the light exit surface of the first anti-reflection film layer, and a third reflected light is formed on the light exit surface of the second anti-reflection film layer, and the first reflected light, the second reflected light and the third reflected light are destructively interfered), wherein n0 is the refractive index of the substrate 1, n a is the refractive index of the black matrix layer 3, n a Greater than n0.

[0078] In an exemplary embodiment, the material of the first anti-reflection film layer 21 or the material of the second anti-reflection film layer 22 is MgO (magnesium oxide), GeO (germanium oxide), SiN x One of (silicon nitride) and MoO (molybdenum oxide).

[0079] In an exemplary embodiment, the first anti-reflection film layer 21 is made of MgO material, and the second anti-reflection film layer 22 is made of SiNx material; after simulation, the reflectivity of the display panel is reduced from 1.19% to 0.228%, which is reduced by 80.8% (reference Figure 3 , Figure 3 The simulation curve 50 is the reflectivity of the display panel without the anti-reflection layer 2, and the simulation curve 60 is the reflectivity of the display panel with the anti-reflection layer 2), and the stray light is reduced by 89%;

[0080] The thickness of the first anti-reflection film layer 21 is 5-10 nm. The thickness of the second anti-reflection film layer 22 is 25-35 nm.

[0081] In an exemplary embodiment, the first anti-reflection film layer 21 is made of GeO (germanium oxide) material, and the second anti-reflection film layer 22 is made of MgO (magnesium oxide) material; after simulation, the reflectivity of the display panel is reduced from 1.19% to 0.295%, which is 75% lower than the reference Figure 4 , Figure 4 The simulation curve 70 is the reflectivity of the display panel without the anti-reflection layer 2, and the simulation curve 80 is the reflectivity of the display panel with the anti-reflection layer 2), and the stray light is reduced by 84%;

[0082] The thickness of the first anti-reflection film layer 21 is 5-10 nm. The thickness of the second anti-reflection film layer 22 is 35-45 nm.

[0083] In an exemplary embodiment, the first anti-reflection film layer 21 is made of MgO (magnesium oxide) material, and the second anti-reflection film layer 22 is made of MoO (molybdenum oxide) material; after simulation, the reflectivity of the light-emitting surface of the display panel is reduced from 1.19% to 0.238%, which is reduced by 80%. Figure 5 , Figure 5The simulation curve 90 is the reflectivity of the display panel without the anti-reflection layer 2, and the simulation curve 91 is the reflectivity of the display panel with the anti-reflection layer 2), and the stray light is reduced by 92%;

[0084] The thickness of the first anti-reflection film layer 21 is 5-10 nm. The thickness of the second anti-reflection film layer 22 is 20-30 nm.

[0085] Through simulation, when the first anti-reflection film layer 21 and the second anti-reflection film layer 22 are used in different combinations, the total amount of reflected stray light changes as shown in Table 2 below.

[0086]

[0087] Referring to Table 2 above, the total stray light includes imaging stray light and non-imaging stray light, and the imaging stray light includes reflected stray light and direct stray light. In this embodiment, by setting the anti-reflection layer 2, the reflected stray light is reduced, thereby also reducing the total stray light. The first anti-reflection film layer 21 and the second anti-reflection film layer 22 use different combinations, and the changes in reflected stray light are different, and the changes in total stray light are also different. The first anti-reflection film layer 21 uses MgO material, and the second anti-reflection film layer 22 uses SiNx material. The reflected stray light is reduced from 0.87% to 0.09%, and the total stray light is reduced from 2.42% to 1.66%. The first anti-reflection film layer 21 uses GeO (germanium oxide) material, and the second anti-reflection film layer 22 uses MgO (magnesium oxide) material. The reflected stray light is reduced from 0.87% to 0.14%, and the total stray light is reduced from 2.42% to 1.70%. The first anti-reflection film layer 21 is made of MgO (magnesium oxide) material, and the second anti-reflection film layer 22 is made of MoO (molybdenum oxide) material. The reflected stray light is reduced from 0.87% to 0.07%, and the total stray light is reduced from 2.42% to 1.63%.

[0088] Due to the existence of stray light, in addition to the main image, there are some images with low brightness and not in the target focal plane in the displayed image, which are called ghost images (i.e., images of stray light). The purity of the image is improved by setting the anti-reflection layer 2. The first anti-reflection film layer 21 is made of MgO material, and the second anti-reflection film layer 22 is made of SiNx material, and the imaging stray light is reduced from 1.11% to 0.34%. The first anti-reflection film layer 21 is made of GeO (germanium oxide) material, and the second anti-reflection film layer 22 is made of MgO (magnesium oxide) material, and the imaging stray light is reduced from 1.11% to 0.38%. The first anti-reflection film layer 21 is made of MgO (magnesium oxide) material, and the second anti-reflection film layer 22 is made of MoO (molybdenum oxide) material, and the imaging stray light is reduced from 1.11% to 0.31%.

[0089] It should be noted that the data in Table 2 above are obtained based on the same signal light. The amount of signal light is 100%, and the proportion in Table 2 is the proportion in the signal light. For example, the proportion of total stray light is 2.42%, which is the proportion of total stray light in the signal light.

[0090] When the anti-reflection layer 2 is only disposed between the shielding area 31 of the black matrix layer 3 and the substrate 1, it is necessary to form the anti-reflection layer 2 through a patterning process. In some embodiments, in order to reduce the cost of the mask and simplify the process, the first substrate 111 further includes a black matrix layer 3 disposed on the substrate 1, and the black matrix layer 3 includes a shielding area 31 and an opening area 32;

[0091] The orthographic projection of the anti-reflection layer 2 on the black matrix layer 3 completely covers the black matrix layer 3. That is, the anti-reflection layer 2 is laid on the substrate 1 on its entire surface, covering the shielding area 31 of the black matrix layer 3 and also covering the opening area 32 of the black matrix layer 3. Fig.14 It should be noted that, in this embodiment, the anti-reflection layer 2 is a transparent structure, and its transparency can be greater than 90% to avoid affecting the light output effect of the display panel.

[0092] The simulation is performed by taking the anti-reflection layer 2 as a single-layer structure and the anti-reflection layer 2 made of germanium oxide as an example (the thickness of the anti-reflection layer 2 is 50-60nm). The simulation results show that the surface reflectivity of the display panel is reduced from 1.19% to 0.69%, a decrease of 42% (such as Figure 6 As shown, Figure 6 The simulation curve 101 represents the reflectivity of the display panel without the anti-reflection layer 2, and the simulation curve 102 represents the reflectivity of the display panel with the anti-reflection layer 2).

[0093] After simulation, after setting the entire anti-reflection layer 2, the total amount of reflected stray light of the display panel is reduced from 0.87% of the original solution (i.e., without the anti-reflection layer 2) to 0.47%, a decrease of 46%, see Table 3 below.

[0094]

[0095] Referring to Table 3 above, the total stray light includes imaging stray light and non-imaging stray light, and the imaging stray light includes reflected stray light and direct stray light. In this embodiment, by setting the anti-reflection layer 2, the reflected stray light is reduced, thereby reducing the total stray light, and the reflected stray light is reduced from 0.87% to 0.47%, and the total stray light is reduced from 2.42% to 2.03%. Due to the presence of stray light, in addition to the main image, there are some images with low brightness and not in the target focal plane in the display screen, which are called ghost images (i.e., imaging of imaging stray light). By setting the anti-reflection layer 2, the imaging stray light is reduced from 1.11% to 0.71%, improving the purity of the picture.

[0096] It should be noted that the data in Table 3 above are obtained based on the same signal light. The amount of signal light is 100%, and the proportion in Table 3 is the proportion in the signal light. For example, the proportion of total stray light is 2.42%, which is the proportion of total stray light in the signal light.

[0097] It should be noted that, for the solution of only setting the anti-reflection layer 2 between the shielding area 31 of the black matrix layer 3 and the substrate 1, and the solution of laying the entire anti-reflection layer 2 between the black matrix layer 3 and the substrate 1, since the color resistance unit 41 is set in the opening area 32, the anti-reflection effect corresponding to the position of the opening area 32 is poorer than the anti-reflection effect of the position of the shielding area 31 (the N values ​​of the materials of the opening area 32 and the shading area 31 are different, so in order to achieve a good anti-reflection effect, it is necessary to select two materials with different N values ​​as the anti-reflection layer 2. In some embodiments, in order to simplify the process, only one material is used to make the anti-reflection layer 2. Layer 2, at this time, the thickness of the anti-reflection layer 2 corresponding to the opening area 32 and the shading area 31 is the same; during the simulation, it was found that such a setting would increase the reflectivity of the opening area 32, but reduce the reflectivity of the shading area 31. After the two areas are superimposed, the reflectivity of the entire layer of anti-reflection layer is lower than the reflectivity of only setting the anti-reflection layer on the shading area). Therefore, comparing Table 1 and Table 3, in the scheme of setting the anti-reflection layer 2 only between the shading area 31 of the black matrix layer 3 and the substrate 1, and the scheme of laying the entire anti-reflection layer 2 between the black matrix layer 3 and the substrate 1, the reflectivity of the display panel is different, and the amount of stray light reduced is also different.

[0098] refer to Figure 15-17 The display panel is a COA structure, the first substrate 111 is a packaging substrate, the second substrate 222 is an array substrate, and the array substrate includes a color resist layer, the color resist layer includes a plurality of color resist units 41, and the orthographic projection of the color resist unit 41 on the display panel is located in the opening area 32 on the black matrix layer 3.

[0099] In an exemplary embodiment, the first substrate 111 further includes a black matrix layer 3 disposed on the substrate 1, and the black matrix layer 3 includes a shielding area 31 and an opening area 32; simulation results show that the reflectivity per unit area of ​​the shielding area is higher (e.g. Figure 1 As shown), therefore, in some embodiments, the anti-reflection layer 2 is located between the substrate 1 and the shielding area 31, that is, the positive projection of the anti-reflection layer 2 on the black matrix layer 3 is located in the shielding area, Fig.15 .

[0100] In an exemplary embodiment, the anti-reflection layer 2 may be a single-layer structure or a multi-layer structure.

[0101] In an exemplary embodiment, the anti-reflection layer 2 is a single-layer structure. In order to achieve the anti-reflection effect, the refractive index n1 of the anti-reflection layer 2 satisfies the following formula: It uses the principle of light interference destructiveness to achieve the anti-reflection effect, where n0 is the refractive index of the substrate 1, n a is the refractive index of the black matrix layer 3 .

[0102] In an exemplary embodiment, the anti-reflection layer 2 is made of germanium oxide, but is not limited thereto.

[0103] In an exemplary embodiment, when the material of the anti-reflection layer 2 is germanium oxide, the thickness of the anti-reflection layer 2 is 40-70 nm.

[0104] Through simulation, it is known that in the 380nm-780nm band, the reflectivity of the green light band contributes the most to stray light. Therefore, in the anti-reflection design of the display panel, the green light band is targeted to be reduced, which helps to reduce the intensity of reflected stray light. Therefore, in order to improve the anti-reflection effect, the thickness of the anti-reflection layer 2 is set to 50-60nm.

[0105] The simulation results show that after adding the anti-reflection layer 2 made of germanium oxide, the reflectivity of the display panel is reduced by 31% from 1.16% to 0.80% (e.g. Figure 7 As shown, Figure 7 The simulation curve 201 represents the reflectivity of the display panel without the anti-reflection layer 2, and the simulation curve 202 represents the reflectivity of the display panel with the anti-reflection layer 2).

[0106] It should be noted that, when a single-layer anti-reflection layer 2 is provided in the non-COA structure, the reflectivity of the display panel is reduced by 45%, and when a single-layer anti-reflection layer 2 is provided in the COA structure, the reflectivity of the display panel is reduced by 31%. When a single-layer anti-reflection layer 2 is provided in the COA structure, the reflectivity of the display panel is improved less, mainly because compared with the display panel without the COA structure, the size of the shading area 31 of the black matrix layer 3 of the display panel with the COA structure is smaller, which affects the improvement of the overall reflectivity.

[0107] After simulation, after the anti-reflection layer 2 is provided, the total amount of reflected stray light is reduced from 0.7% of the original solution to 0.4%, a reduction of 42%, see Table 4 below.

[0108]

[0109] Referring to Table 4 above, the total stray light includes imaging stray light and non-imaging stray light, and the imaging stray light includes reflected stray light and direct stray light. In this embodiment, by setting the anti-reflection layer 2, the reflected stray light is reduced, thereby reducing the total stray light, and the reflected stray light is reduced from 0.70% to 0.40%, and the total stray light is reduced from 2.26% to 1.96%. Due to the presence of stray light, in addition to the main image, there are some images with low brightness and not in the target focal plane in the display screen, which are called ghost images (i.e., imaging of imaging stray light). By setting the anti-reflection layer 2, the imaging stray light is reduced from 0.94% to 0.65%, thereby improving the purity of the picture.

[0110] It should be noted that the data in Table 4 above are obtained based on the same signal light. The amount of signal light is 100%, and the proportion in Table 4 is the proportion in the signal light. For example, the proportion of total stray light is 2.26%, which is the proportion of total stray light in the signal light.

[0111] In an exemplary embodiment, in order to improve the anti-reflection effect, the anti-reflection layer 2 is configured as a multi-layer structure. Fig.16 In some embodiments, the anti-reflection layer 2 includes a first anti-reflection film layer 21 and a second anti-reflection film layer 22 stacked in sequence in a direction away from the substrate 1, and the refractive index n2 of the first anti-reflection film layer 21 and the refractive index n3 of the second anti-reflection film layer 22 satisfy the following formula: It uses the principle of light interference destructiveness to achieve the anti-reflection effect, where n0 is the refractive index of the substrate 1, n a is the refractive index of the black matrix layer 3, n a Greater than n0.

[0112] In an exemplary embodiment, the material of the first anti-reflection film layer 21 or the material of the second anti-reflection film layer 22 is MgO, GeO, SiN x and one of MoO.

[0113] In an exemplary embodiment, the first anti-reflection film layer 21 is made of MgO material, and the second anti-reflection film layer 22 is made of SiNx (silicon nitride) material; after simulation, the reflectivity of the display panel is reduced from 1.16% to 0.52%, which is reduced by 55% (e.g. Figure 8 As shown, Figure 8 The simulation curve 301 represents the reflectivity of the display panel without the anti-reflection layer 2, and the simulation curve 302 represents the reflectivity of the display panel with the anti-reflection layer 2), and the stray light is reduced by 70%;

[0114] The thickness of the first anti-reflection film layer 21 is 5-10 nm. The thickness of the second anti-reflection film layer 22 is 25-35 nm.

[0115] In an exemplary embodiment, the first anti-reflection film layer 21 is made of GeO material, and the second anti-reflection film layer 22 is made of MgO material; after simulation, the reflectivity of the display panel is reduced from 1.16% to 0.56%, which is reduced by 52% (e.g. Fig. 9 As shown, Fig. 9 The simulation curve 401 represents the reflectivity of the display panel without the anti-reflection layer 2, and the simulation curve 402 represents the reflectivity of the display panel with the anti-reflection layer 2), and the stray light is reduced by 74%;

[0116] The thickness of the first anti-reflection film layer 21 is 5-10 nm. The thickness of the second anti-reflection film layer 22 is 35-45 nm.

[0117] In an exemplary embodiment, the first anti-reflection film layer 21 is made of MgO material, and the second anti-reflection film layer 22 is made of MoO material; after simulation, the reflectivity of the light-emitting surface of the display panel is reduced from 1.16% to 0.53%, which is reduced by 77% (e.g. Fig.10 As shown, Fig.10 The simulation curve 501 represents the reflectivity of the display panel without the anti-reflection layer 2, and the simulation curve 502 represents the reflectivity of the display panel with the anti-reflection layer 2), and the stray light is reduced by 77%;

[0118] The thickness of the first anti-reflection film layer 21 is 5-10 nm. The thickness of the second anti-reflection film layer 22 is 20-30 nm.

[0119] Through simulation, when the first anti-reflection film layer 21 and the second anti-reflection film layer 22 are used in different combinations, the total amount of reflected stray light changes as shown in Table 5 below.

[0120]

[0121] Referring to Table 5, the total stray light includes imaging stray light and non-imaging stray light, and the imaging stray light includes reflected stray light and direct stray light. In this embodiment, by setting the anti-reflection layer 2, the reflected stray light is reduced, thereby reducing the total stray light. The first anti-reflection film layer 21 and the second anti-reflection film layer 22 use different combinations, and the changes in reflected stray light are different, and the changes in total stray light are also different. The first anti-reflection film layer 21 uses MgO material, and the second anti-reflection film layer 22 uses SiNx material. The reflected stray light is reduced from 0.70% to 0.18%, and the total stray light is reduced from 2.26% to 1.74%. The first anti-reflection film layer 21 uses GeO (germanium oxide) material, and the second anti-reflection film layer 22 uses MgO (magnesium oxide) material. The reflected stray light is reduced from 0.70% to 0.21%, and the total stray light is reduced from 2.26% to 1.77%. The first anti-reflection film layer 21 is made of MgO (magnesium oxide) material, and the second anti-reflection film layer 22 is made of MoO (molybdenum oxide) material. The reflected stray light is reduced from 0.70% to 0.16%, and the total stray light is reduced from 2.26% to 1.73%.

[0122] Due to the existence of stray light, in addition to the main image, there are some images with low brightness and not in the target focal plane in the displayed image, which are called ghost images (i.e., images of stray light). The purity of the image is improved by setting the anti-reflection layer 2. The first anti-reflection film layer 21 is made of MgO material, and the second anti-reflection film layer 22 is made of SiNx material, and the imaging stray light is reduced from 0.94% to 0.43%. The first anti-reflection film layer 21 is made of GeO (germanium oxide) material, and the second anti-reflection film layer 22 is made of MgO (magnesium oxide) material, and the imaging stray light is reduced from 0.94% to 0.46%. The first anti-reflection film layer 21 is made of MgO (magnesium oxide) material, and the second anti-reflection film layer 22 is made of MoO (molybdenum oxide) material, and the imaging stray light is reduced from 0.94% to 0.41%.

[0123] It should be noted that the data in Table 5 above are obtained based on the same signal light. The amount of signal light is 100%, and the proportion in Table 5 is the proportion in the signal light. For example, the proportion of total stray light is 2.26%, which is the proportion of total stray light in the signal light.

[0124] When the anti-reflection layer 2 is only disposed between the shielding area 31 of the black matrix layer 3 and the substrate 1, it is necessary to form the anti-reflection layer 2 through a patterning process. In some embodiments, in order to reduce the cost of the mask and simplify the process, the first substrate 111 further includes a black matrix layer 3 disposed on the substrate 1, and the black matrix layer 3 includes a shielding area 31 and an opening area 32;

[0125] The orthographic projection of the anti-reflection layer 2 on the black matrix layer 3 completely covers the black matrix layer 3. That is, the anti-reflection layer 2 is laid on the substrate 1 on its entire surface, covering the shielding area 31 of the black matrix layer 3 and also covering the opening area 32 of the black matrix layer 3. Fig.17 It should be noted that, in this embodiment, the anti-reflection layer 2 is a transparent structure, and its transparency can be greater than 90% to avoid affecting the light output effect of the display panel.

[0126] The simulation is performed by taking the anti-reflection layer 2 as a single-layer structure and the anti-reflection layer 2 as made of germanium oxide (the thickness of the anti-reflection layer is 50-60nm). The simulation results show that the reflectivity of the light-emitting surface of the display panel is reduced from 1.16% to 0.90%, a decrease of 22% (as shown in FIG11, Fig.11 The simulation curve 601 represents the reflectivity of the display panel without the anti-reflection layer 2, and the simulation curve 602 represents the reflectivity of the display panel with the anti-reflection layer 2).

[0127] After simulation, after setting the entire anti-reflection layer 2, the total amount of reflected stray light of the display panel is reduced from 0.7% of the original solution (i.e., without the anti-reflection layer 2) to 0.43%, a decrease of 39%, see Table 6 below.

[0128]

[0129] Referring to Table 6 above, the total stray light includes imaging stray light and non-imaging stray light, and the imaging stray light includes reflected stray light and direct stray light. In this embodiment, by setting the anti-reflection layer 2, the reflected stray light is reduced, thereby reducing the total stray light, and the reflected stray light is reduced from 0.70% to 0.43%, and the total stray light is reduced from 2.26% to 1.99%. Due to the presence of stray light, in addition to the main image, there are some images with low brightness and not in the target focal plane in the display screen, which are called ghost images (i.e., imaging of imaging stray light). By setting the anti-reflection layer 2, the imaging stray light is reduced from 0.94% to 0.67%, improving the purity of the picture.

[0130] It should be noted that the data in Table 6 above are obtained based on the same signal light. The amount of signal light is 100%, and the proportion in Table 6 is the proportion in the signal light. For example, the proportion of total stray light is 2.26%, which is the proportion of total stray light in the signal light.

[0131] It should be noted that, for the solution of setting the anti-reflection layer 2 only in the shielding area 31 of the black matrix layer 3 and the substrate 1, and the solution of laying the anti-reflection layer 2 as a whole between the black matrix layer 3 and the substrate 1, since the color resistance unit 41 is set in the opening area 32, the anti-reflection effect corresponding to the position of the opening area 32 is poorer than the anti-reflection effect of the position of the shielding area 31 (the N values ​​of the materials of the opening area 32 and the shading area 31 are different, so in order to achieve a good anti-reflection effect, it is necessary to select two materials with different N values ​​as the anti-reflection layer 2. In some embodiments, in order to simplify the process, only one material is used to make the anti-reflection layer 2. Layer 2, at this time, the thickness of the anti-reflection layer 2 corresponding to the opening area 32 and the shading area 31 is the same; during the simulation, it was found that such a setting would increase the reflectivity of the opening area 32, but reduce the reflectivity of the shading area 31. After the two areas are superimposed, the reflectivity of the entire layer of anti-reflection layer is lower than the reflectivity of only setting the anti-reflection layer on the shading area). Therefore, comparing Table 4 and Table 6, in the scheme of setting the anti-reflection layer 2 only in the shading area 31 of the black matrix layer 3 and the substrate 1, and in the scheme of laying the entire anti-reflection layer 2 between the black matrix layer 3 and the substrate 1, the reflectivity of the display panel is different, and the amount of stray light reduced is also different.

[0132] In an exemplary embodiment, after the anti-reflection layer 2 is provided, the reflectivity of the light emitting surface of the display panel is 0.2%-0.9%.

[0133] It should be noted that the reflectivity of the light emitting surface of the display panel is related to factors such as the refractive index of the anti-reflection layer 2 and the thickness of the anti-reflection layer 2 , and is not limited to the above numerical range.

[0134] The embodiment of the present disclosure further provides an optical module, comprising the above-mentioned display panel and an optical device located on the light emitting side of the display panel.

[0135] Exemplarily, the optical device may include a first lens 200 and a second lens 300, referring to Figure 18-Figure 21 , but it is not limited to this.

[0136] The embodiment of the present disclosure also provides a display device, comprising the above-mentioned optical module.

[0137] The display device provided by the embodiments of the present disclosure may be a VR display device, such as VR glasses or VR helmets. The VR display device includes a shell, and the optical module arranged in the shell, and the optical module is arranged in the forehead area, that is, when worn, the optical module is arranged in front of the human eye, and the light emitted by the display panel is incident on the human eye via the optical device.

[0138] It should be noted that the optical module includes the above-mentioned display panel, the optical device may include a first lens 200 and a second lens 300, the display panel may be a liquid crystal display panel, or a self-luminous panel, such as an OLED display panel, and when the display panel is a liquid crystal display panel, the optical film group also includes a backlight source that provides light source for the display panel.

[0139] In some embodiments, the display panel emits polarized light, and a polarizer for transmitting the polarized light emitted by the display panel is disposed on the light emitting side of the display panel.

[0140] The optical module includes a first lens 200 and a second lens 300, and may also include other lenses, reflectors, or other optical elements that guide light to the human eye.

[0141] The display device may also be any product or component with a display function, such as electronic paper, a mobile phone, a tablet computer, a television, a laptop computer, a digital photo frame, a navigator, etc. This embodiment is not limited here.

[0142] There are a few points to note:

[0143] (1) The drawings of the embodiments of the present disclosure only relate to the structures related to the embodiments of the present disclosure, and other structures may refer to the general design.

[0144] (2) For the sake of clarity, in the drawings used to describe the embodiments of the present disclosure, the thickness of layers or regions is exaggerated or reduced, that is, these drawings are not drawn according to the actual scale. It is understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "under" another element, the element may be "directly" "on" or "under" the other element or there may be intermediate elements.

[0145] (3) In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to obtain new embodiments.

[0146] It is to be understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present disclosure, but the present disclosure is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and substance of the present disclosure, and these modifications and improvements are also considered to be within the scope of protection of the present disclosure.

Claims

1. A display panel, comprising a first substrate and a second substrate arranged opposite to each other, characterized in that: The first substrate comprises a substrate, and an anti-reflection layer is arranged on a side of the substrate facing the second substrate; The first substrate further comprises a black matrix layer disposed on the substrate, wherein the black matrix layer comprises a shielding area and an opening area; The anti-reflection layer is located between the substrate and the shielding area; or The orthographic projection of the anti-reflection layer on the black matrix layer completely covers the black matrix layer.

2. The display panel according to claim 1, characterized in that: The anti-reflection layer is a single-layer structure or a multi-layer structure.

3. The display panel according to claim 1, characterized in that: The anti-reflection layer is a single-layer structure, and the refractive index n1 of the anti-reflection layer satisfies the following formula: Wherein, n0 is the refractive index of the substrate, n a is the refractive index of the black matrix layer.

4. The display panel according to claim 1, characterized in that: The material of the anti-reflection layer is one of germanium oxide, magnesium oxide, silicon nitride and molybdenum oxide.

5. The display panel according to claim 1, characterized in that: The thickness of the anti-reflection layer is 40-70 nm.

6. The display panel according to claim 1, characterized in that: The anti-reflection layer comprises a first anti-reflection film layer and a second anti-reflection film layer stacked in sequence in a direction away from the substrate, and the refractive index n2 of the first anti-reflection film layer and the refractive index n3 of the second anti-reflection film layer satisfy the following formula: Wherein, n0 is the refractive index of the substrate, n a is the refractive index of the black matrix layer, n a Greater than n0.

7. The display panel according to claim 6, characterized in that: The first anti-reflection film layer is made of molybdenum oxide material, and the second anti-reflection film layer is made of silicon nitride material; The thickness of the first anti-reflection film layer is 5-10 nm, and the thickness of the second anti-reflection film layer is 25-35 nm.

8. The display panel according to claim 6, characterized in that: The first anti-reflection film layer is made of germanium oxide material, and the second anti-reflection film layer is made of magnesium oxide material; The thickness of the first anti-reflection film layer is 5-10 nm, and the thickness of the second anti-reflection film layer is 35-45 nm.

9. The display panel according to claim 6, characterized in that: The first anti-reflection film layer is made of magnesium oxide material, and the second anti-reflection film layer is made of molybdenum oxide material; The thickness of the first anti-reflection film layer is 5-10nm, and the thickness of the second anti-reflection film layer is 20-30nm.

10. The display panel according to claim 1, characterized in that: The first substrate is a color filter substrate, the second substrate is an array substrate, the first substrate includes a color resist layer, and the color resist layer includes a color resist unit disposed in the opening area.

11. The display panel according to claim 1, characterized in that: The first substrate is a packaging substrate, the second substrate is an array substrate, and the array substrate includes a color resist layer, the color resist layer includes a plurality of color resist units, and the orthographic projections of the color resist units on the display panel are located in opening areas on the black matrix layer.

12. The display panel according to claim 1, characterized in that: The reflectivity of the light emitting surface of the display panel is 0.2%-0.9%.

13. An optical module, characterized in that: The invention comprises the display panel according to any one of claims 1 to 12 and an optical device located on the light emitting side of the display panel.

14. A display device, characterized in that: Comprising the optical module as claimed in claim 13.

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