A display panel

Abstract

The application provides a display panel, and belongs to the technical field of OLEDs, wherein the display panel comprises a substrate substrate, a plurality of pixel units are arranged on the substrate substrate, at least one pixel unit comprises a plurality of sub-pixels; a plurality of light control areas are arranged on the light-emitting side of the pixel unit, the light control areas are sequentially and spacedly arranged along the center of the substrate substrate to the edge direction; light control elements are arranged in at least part of the light control areas, and different preset deflection angles are arranged in the light control elements correspondingly; the light control elements are configured to refract the light emitted by the pixel unit, so that the light is emitted along the preset direction; wherein the deflection angles of the light refracted by the light control areas gradually increase along the center of the substrate substrate to the edge direction. The display panel provided in the application can avoid the problem of color deviation caused by the light emitted from the edge position of the display panel under the premise of ensuring the light-emitting brightness.

Description

Technical Field

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

[0002] As the augmented reality / virtual reality (AR / VR) market continues to expand, OLED microdisplay technology products (also known as silicon-based OLED) are increasingly showing business opportunities in the AR / VR field due to their superior characteristics such as self-illumination, thinness, and light weight.

[0003] Currently, most silicon-based OLED microdisplays use a white light plus a color filter (CF) scheme for colorization. Due to the presence of the color filter, the overall energy utilization rate is low, and two electroluminescent devices need to be connected in series to ensure high brightness. The series connection of electroluminescent devices results in an excessively long cavity length of the optical microcavity system, and the color shift is very serious at the large emission angle at the edge of the screen.

[0004] Therefore, it is urgent to solve the problem that color shift in existing display panels is easily affected by the large emission angle at the edge of the screen. Summary of the Invention

[0005] In view of this, the object of the present invention is to provide a display panel to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides a display panel, comprising:

[0007] Substrate;

[0008] Multiple pixel units are located on the substrate, and at least one pixel unit includes multiple sub-pixels;

[0009] Multiple light control regions are located on the light-emitting side of the pixel unit, and the light control regions are arranged sequentially at intervals along the center of the substrate towards the edge; at least some of the light control regions are provided with light control elements, and at least some of the light control elements are respectively provided with different preset deflection angles; the light control elements are configured to refract the light emitted by the pixel unit so that the light is emitted in a preset direction;

[0010] The deflection angle of the refracted light in each of the light-controlled regions gradually increases from the center to the edge of the substrate.

[0011] Furthermore, the light control region is configured as an annular region centered on the center point of the substrate, and the annular width of each light control region is the same.

[0012] Furthermore, the light control element is configured in a one-to-one correspondence with the pixel unit.

[0013] Furthermore, the light control element includes a polarizing prism, which comprises a plurality of straight prisms whose thickness decreases sequentially from the center to the edge of the substrate.

[0014] Furthermore, the polarizing prisms have the same thickness on the side closest to the center of the substrate.

[0015] Furthermore, the light control element includes a metasurface structure comprising multiple nanopillars of different diameters. In the same light control region, the diameter of each nanopillar gradually decreases from the center to the edge of the substrate.

[0016] Furthermore, the substrate is provided with at least two layers of the metasurface structure at intervals along the direction of light propagation path, and the adjacent layers of the metasurface structure are matched with different preset wavebands.

[0017] Furthermore, it also includes a base wafer, on which the light control element can be imprinted using nanoimprint technology, and the base wafer is configured to be connected to the light-emitting side of the pixel unit.

[0018] Furthermore, it also includes: a color filter film located on the side of the pixel unit away from the substrate, the color filter film corresponding one-to-one with the sub-pixel; and the light control element located on the light-emitting side of the color filter film.

[0019] Furthermore, it also includes:

[0020] A microlens array layer is located between the color filter film and the light control element, and the microlens array layer is correspondingly arranged with the color filter film.

[0021] As can be seen from the above, the display panel provided by the present invention has multiple pixel units on a substrate, and at least one of the pixel units includes multiple sub-pixels. Since the emission angle of the light emitted by the pixel units is different, at least some of the light control elements are respectively set with different preset deflection angles corresponding to each pixel unit. When the light control element receives the light from the pixel unit, it can refract the light. Since the deflection angle of the refracted light in each light control area gradually increases from the center to the edge of the substrate, the light can be emitted in a preset direction, thereby ensuring a good color visual experience for the light at different positions on the substrate and avoiding color shift of light emitted at large angles. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1A This is a schematic diagram of the microcavity effect in an embodiment of the present invention;

[0024] Figure 1B This is a simulation diagram of the microcavity effect when two electroluminescent devices are connected in series in an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the overall structure of the display panel in an embodiment of the present invention;

[0026] Figure 3 This is a distribution diagram of the light-controlled region of the substrate in an embodiment of the present invention;

[0027] Figure 4A This is a schematic diagram of the polarizing prism structure on the substrate in an embodiment of the present invention;

[0028] Figure 4B This is a schematic diagram of the microlens array layer in an embodiment of the present invention.

[0029] Figure 5 This is a structural diagram of a polarizing prism in an embodiment of the present invention;

[0030] Figure 6 This is a flowchart illustrating the fabrication process when the light-controlling element is a polarizing prism in an embodiment of the present invention.

[0031] Figure 7A This is a structural diagram of one form of the metasurface structure column in an embodiment of the present invention;

[0032] Figure 7B This is a schematic diagram of the simulation model of the metasurface structure column in an embodiment of the present invention;

[0033] Figure 7C for Figure 7B A detailed simulation structure diagram;

[0034] Figure 7D This is a diagram illustrating one structural form of the metasurface structure on a substrate in an embodiment of the present invention;

[0035] Figure 8A This is a flowchart illustrating the fabrication process of a display panel in an embodiment of the present invention.

[0036] Figure 8B This is another flowchart illustrating the fabrication process of the display panel in an embodiment of the present invention.

[0037] Explanation of reference numerals in the attached figures

[0038] 1. Substrate; 2. Light control area; 3. Polarizing prism; 4. Metasurface structure pillar; 5. Straight prism; 6. Microlens array layer; 7. Color filter film; 8. TFE encapsulation layer; 9. EL layer; 10. Base wafer; 11. Glass cover plate. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0040] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this invention should have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0041] The terms used in this embodiment are explained as follows:

[0042] Angle customization:

[0043] In VR / AR, the optical module needs to magnify a smaller screen and project it to a distant location, forming a magnified virtual image in front of the viewer for a better visual experience. Because the image is magnified, the entire optical system has different requirements for the direction of light emission at different locations on the screen. The closer to the edge of the screen, the larger the angle at which light enters the viewer's eye through the optical system. Therefore, the light at the edges of the display panel needs to be deflected to a certain extent, i.e., the angle of the light at different locations needs to be "customized."

[0044] Microcavity effect in optics:

[0045] In OLED devices, electrons from the cathode and holes from the anode can recombine in the emissive layer, radiating energy outward in the form of photons. This process is similar to dipole oscillation and can be viewed as a point light source radiating energy in all directions simultaneously. When both the anode and cathode surfaces have a certain reflectivity, light can undergo multiple reflections and oscillations between the two reflective surfaces. According to the wave correlation principle, waves that meet specific wavelength conditions will be amplified, while waves that do not meet the conditions will be attenuated. This process is called the microcavity effect.

[0046] The microcavity effect has two significant characteristics: 1. It can effectively narrow the half width at half maximum (WHM) of the emission spectrum, and an appropriate microcavity can improve the light extraction efficiency; 2. The microcavity effect has a strong cavity length dependence. As the viewing angle changes, the equivalent cavity length will also change, which in turn will cause the highest point of the emission peak to change. Under normal circumstances, as the viewing angle increases, the peak point of the microcavity effect will show a blue shift.

[0047] in, Figure 1A This is a schematic diagram of the microcavity effect in this embodiment. The correlation spectrum in the microcavity effect should satisfy the following formula:

[0048]

[0049] Where T2, R2, and R1 are the transmittance and reflectance of the emitting surface and the reflectance of the emitting surface, respectively. L1 is the distance from the emitting surface to the reflecting surface, L is the total cavity length, φ1 and φ2 are the phase shifts of the reflected light from the reflecting surface and the emitting surface, respectively, and ω is the angular frequency of the light wave. It can be seen that... and Under these conditions, the gain effect reaches its maximum value, and the wavelength corresponding to this value is the wavelength of the microcavity gain peak.

[0050] Figure 1B The figure shows a simulation of the microcavity effect when two ELs (electroluminescent devices) are connected in series. The horizontal axis represents wavelength, and the vertical axis represents viewing angle. The center of the vertical axis is the normal viewing angle, and the angles shifted to the sides are the wide viewing angles. It can be seen that as the viewing angle increases, the gain peak of the microcavity effect exhibits a blue shift. The lower half of the figure shows the intrinsic spectrum of the RGB three-color EL. The final visual effect presented by the entire device is actually the product of the intrinsic peak and the gain peak.

[0051] As can be seen, at a normal viewing angle, the intrinsic and gain peaks of the B and G color spectra coincide, while those of the R color spectrum are offset. However, at a wide viewing angle, the intrinsic and gain peaks of the B and G color spectra are offset, while those of the R color spectrum gradually coincide. This means that as the viewing angle increases, the brightness of the B and G color spectra gradually decreases, while the brightness of the R color spectrum gradually increases. This peak position variation under this specific structure causes the EL device to exhibit a significant red tint at wide viewing angles.

[0052] Current solutions typically involve precisely misaligning the MicroLENS (microscope lens) with the actual pixels to customize the angle of the emitted light. However, when using MicroLENS to deflect light, the need to offset the light source position for each pixel means that the emitted light can easily end up on adjacent MicroLENS, resulting in an unsatisfactory deflection effect. Furthermore, MicroLENS refract light differently at different angles (frontal and edge views), which can lead to discrepancies between the actual displayed color coordinates.

[0053] Based on the above problem description, this embodiment proposes a display panel to better achieve the deflection effect of OLED light at large angles, thereby avoiding color shift problems.

[0054] like Figure 2 and Figure 3 As shown, the display panel in this embodiment includes a substrate 1 and a plurality of pixel units located on the substrate. At least one pixel unit includes a plurality of sub-pixels and a plurality of light control regions located on the light-emitting side of the pixel unit. The light control regions are arranged sequentially at intervals from the center to the edge of the substrate. At least some of the light control regions are provided with light control elements, and at least some of the light control elements are respectively provided with different preset deflection angles. The light control elements are configured to refract the light emitted by the pixel unit so that the light is emitted in a preset direction. The deflection angle of the light refracted by each light control region gradually increases from the center to the edge of the substrate.

[0055] As can be seen from the above description, the display panel provided by the present invention can refract light when the light control element receives light from the pixel unit. Since the deflection angle of the refracted light in each light control area gradually increases from the center to the edge of the substrate, the light can be deflected out along the preset direction, i.e. the forward viewing angle, so that the light at different positions on the substrate can ensure a good color visual experience and avoid color shift of light emitted at large angles.

[0056] In some embodiments, a plurality of pixel units are provided on the substrate, and each pixel unit includes a plurality of sub-pixels. The sub-pixels are composed of the three primary colors of red, blue and green (RGB). The arrangement of the sub-pixels to form the pixel unit can adopt an existing mature arrangement form, such as the Pentile arrangement.

[0057] like Figure 4A As shown, in some embodiments, the aforementioned substrate 1 generally includes an EL layer 9 and an encapsulation layer 8. Here, the display panel also includes a color filter film 7, which is located on the side of the pixel unit away from the substrate. The color filter film 7 corresponds one-to-one with the sub-pixels. The light control element is located on the light-emitting side of the color filter film 7. In this embodiment, the assembly process of the color filter film 7 and the sub-pixels corresponding one-to-one can adopt existing mature technology. The following description uses the structure of color filter film 7 arranged on the substrate 1.

[0058] In some embodiments, such as Figure 4B As shown, a microlens array layer 6 is also arranged between the color filter film 7 and the light control element. The microlens array layer 6 is located between the color filter film 7 and the light control element, and is arranged correspondingly to the color filter film 7. The microlens array layer 6 is used to concentrate the light emitted by the electroluminescent layer so that the light located at the edge position is focused to the forward viewing angle.

[0059] Here, the microlens array layer 6 is a mature MicroLENS from the prior art. In this embodiment, the MicroLENS is not used to deflect light, but is instead aligned with the light source position of each pixel and only serves to converge the light. This is because when the MicroLENS is used to deflect light in the prior art, it needs to be slightly offset from the light source position of the pixel. This setting requires high alignment accuracy. At the same time, the light source located at adjacent pixels is prone to accidentally passing through the MicroLENS that is offset by a certain distance, resulting in color errors. Therefore, in this solution, the MicroLENS is used to converge the light, and then the light is deflected by the light control element. This setting can reduce the setting accuracy of the MicroLENS and can achieve light deflection at the edge position while ensuring the brightness of the light.

[0060] In this embodiment, the light control element and the pixel unit are arranged in a one-to-one correspondence. Because the light refraction angle of the pixel unit at the edge is larger, such as... Figure 2 As shown, Figure 2The arrow in the image indicates the direction of the light after being deflected by the light control element, which is the corresponding preset direction. The preset direction refers to the deflection direction when the light emitted by the edge pixel is deflected to the large field of view. Since the edge position is different, the preset direction corresponding to each edge position is also different. The preset deflection angle is the angle used to deflect the light to the preset direction of the large field of view.

[0061] like Figure 2 and Figure 4A As shown, in some embodiments, the light control element is a polarizing prism 3. Among any two adjacent polarizing prisms 3, the refraction angle of the polarizing prism 3 closer to the center of the substrate 1 is smaller than the refraction angle of the polarizing prism 3 closer to the edge of the substrate 1. Specifically, according to the principle of refraction, the light emitted from the substrate 1 of the display panel, which should be emitted in the forward direction, changes its propagation direction when it encounters the oblique prism, and the angle between the forward and backward propagation directions is related to the preset deflection angle of the prism.

[0062] In some embodiments, the thickness of each polarizing prism 3 on the side closest to the center of the substrate 1 is the same. This setting can further improve the uniformity of light refracted by the polarizing prism, which is beneficial to improving the overall visual experience. It should be noted that in the above embodiments, the thickness of each polarizing prism on the side closest to the center of the substrate 1 is allowed to be considered the same within a certain error range. For example, the difference between the maximum and minimum thickness is not greater than a set value. This set value should be set according to the actual use scenario, as long as the polarizing prisms with too large a difference do not affect the visual effect of light refraction.

[0063] Furthermore, in AR or VR, the closer to the screen edge, the larger the exit angle of the light entering the human eye through the optical system. Therefore, the closer to the center of the substrate 1, the smaller the actual angle of deflection for light rays with a forward viewing angle, and the closer to the edge of the substrate 1, the larger the actual angle of deflection for light rays with large angles. By rationally designing the preset deflection angles of each polarizing prism 3, the light emitted forward from the edge pixels can be deflected to a large field of view, thereby avoiding the brightness attenuation of large-angle light rays and making the light rays emitted at large angles from the edge have similar color coordinates to the light rays emitted from the center with a forward viewing angle, thus suppressing the problem of large-viewpoint color shift.

[0064] like Figure 3 and Figure 4AAs shown, in some embodiments, the light control region 2 is a plurality of concentric ring-shaped regions centered on the center point of the substrate 1. The ring width of each light control region 2, that is, the spacing between the inner and outer rings, is the same. In each light control region 2, the polarizing prism 3 corresponding to the light control element is a ring-shaped polarizing prism 3 arranged along the light control region 2. Here, due to the uniformity of light scattering, the ring-shaped polarizing prism 3 can uniformly deflect and emit the light from the substrate 1. Here, because the scattering angles of the light are different, the boundary line of the light control region 2 is not clear. Therefore, the alignment accuracy requirement between the light control element and the substrate 1 is low, which is beneficial for quickly and efficiently assembling the light control element onto the substrate 1.

[0065] In some embodiments, a certain scattering range can be defined, and a set of light-controlling elements can be arranged in the light control region 2 within the scattering range. For example, the scattering region between 0° and 10° can be defined as a light control region 2, and a set of light-controlling elements for refracting light from 0° to 10° can be arranged in this light control region 2; the scattering region between 10° and 20° can be defined as a light control region 2, and a set of light-controlling elements for refracting light from 10° to 20° can be arranged in this light control region 2; the scattering region between 20° and 30° can be defined as a light control region 2, and a set of light-controlling elements for refracting light from 20° to 30° can be arranged in this light control region 2. Of course, this embodiment is only for illustrative purposes, and the division of the light control region 2 can also be set in other angular ranges.

[0066] It should be noted that in some embodiments, a set of light control elements are evenly distributed in each light control area, and each set of light control elements is respectively set with different preset deflection angles. This setting can further improve the uniformity of refraction of incident light, thereby ensuring a good color visual experience. As an alternative implementation, the light control elements in different light control areas can be omitted. For example, the light control elements in every other light control area can be omitted, or only the light control elements in one light control area can be omitted. As another alternative implementation, the light control elements in adjacent light control areas can be set with the same preset deflection angle to simplify the assembly process.

[0067] In some embodiments, the polarizing prism 3 is configured as a non-annular strip prism, which is also spaced apart from the center of the substrate 1 toward the edge, and the preset deflection angle of each strip prism increases sequentially toward the edge.

[0068] Furthermore, such as Figure 5As shown, the polarizing prism 3 includes multiple straight prisms 5 whose thickness gradually decreases from the center to the edge of the substrate. Since the polarizing prism 3 needs to achieve phase adjustment of the light wave, the refraction accuracy of the polarizing prism 3 is required to be high. The method of using multiple straight prisms 5 to make the polarizing prism 3 can avoid the complexity of the manufacturing process of the polarizing prism 3 with smooth transition, which affects efficiency and cost, and facilitates actual processing and production.

[0069] like Figure 6 As shown, the polarizing prism 3 is manufactured by step-exposure followed by curing of a single straight prism. The specific steps are as follows:

[0070] S1, Obtain a straight prism and coat it with photoresist.

[0071] S2, perform stepped exposure on the prism.

[0072] S3, solidification yields polarizing prism 3.

[0073] In some embodiments, in step S2, multiple step exposures can be performed according to a preset deflection angle as needed, and a prism of new thickness will be formed after each step exposure. For example, the exposures can be performed sequentially. Figure 6 The example in the text shows three exposures, or other exposures. Here, Figure 6 The curing mentioned in this embodiment refers to the curing operation.

[0074] In some embodiments, such as Figure 7A As shown, the light-controlling element is a metasurface structure, which includes multiple nanopillars of different diameters. Within the same light-controlling region, the diameter of each nanopillar gradually decreases from the center to the edge of the substrate. Since the metasurface structure can adjust the phase and / or amplitude of light, the light emitted in a preset direction after being adjusted by the metasurface structure. Here, the metasurface structure can employ the mature existing metasurface structure pillar 4, which, based on the generalized Snell's law, uses subwavelength microstructures to control the phase and / or amplitude of electromagnetic waves, thereby achieving the deflection of light.

[0075] Specifically, in this embodiment, multiple metasurface structure pillars 4 with different diameters are arranged on the substrate 1. The diameter of the metasurface structure pillars 4 is in the subwavelength range, and the height is on the order of hundreds of nanometers. Since the actual angle of the light being adjusted is different, it is necessary to calculate the phase change and transmittance change covered by the size. According to the requirements of the metasurface structure pillars 4, the structure should cover a phase change of 2π and the transmittance should be as high as possible. Here, since the actual required deflection angle is different for each angle, it is necessary to arrange corresponding metasurface structure pillars 4. The arrangement spacing of the metasurface structure pillars 4 can be calculated based on existing mature calculation methods, as long as the light passes through the metasurface structure pillars 4 and is refracted out along the preset direction.

[0076] like Figure 7B As shown, Figure 7B The simulation model of the metasurface structure column 4 is based on the commercial software FDTD. The model consists of metasurface structure columns 4 of different diameters and a septum glass layer located under the metasurface structure columns 4. Through precise calculation of the metasurface nanocolumns, the refraction of light is achieved so that the light is emitted in a preset direction.

[0077] Figure 7C The figure shows the specific simulation structure of the simulation model. Here, the metasurface structure pillar 4 has a deflection angle of 20°. The results show that light emitted in the forward direction is deflected after passing through the deflecting lens, and the final propagation direction has an angle of 20° with the forward direction, consistent with the design result. This result demonstrates that the structure of the nanopillar metalens can meet the requirements for customized display panel angles.

[0078] Furthermore, such as Figure 7D As shown, the substrate 1 has two layers of metasurface structures spaced apart along the light propagation path. Each metasurface structure layer has multiple sets of metasurface structure pillars 4, and each layer of metasurface structure pillars 4 is matched to a different preset wavelength band. Specifically, a first layer of metasurface structure for a specific wavelength band is prepared on top of the color filter film 7. After planarization, a second layer of metasurface structure for other wavelength bands is prepared. Through the spatial superposition of metasurface structures, phase adjustment of each wavelength band of the display panel is achieved, thereby realizing light emission from a preset direction at a specific location on the display panel. Here, the setting of a specific wavelength band should match the preset direction of the light at that location.

[0079] In some embodiments, such as Figure 8A As shown, the metasurface structure pillars can be connected to the substrate in the following ways:

[0080] A1, Prepare OLED substrate 1.

[0081] A2, prepare the aforementioned metasurface structure.

[0082] A3, the metasurface structure is imprinted onto the OLED substrate 1 using nanoimprint technology.

[0083] The OLED substrate 1 can be fabricated using existing mature technologies. A base wafer 10 is bonded to its surface to facilitate subsequent dry etching processes. Nanoimprint technology is then used. Figure 8A The NIL identifier in the image is combined with a dry etching process. Figure 8AThe metasurface structure (represented by the Dry etch logo) is imprinted onto the base wafer 10 of the OLED substrate 1. After planarization, the product is obtained by bonding a glass cover plate 11 with resin to form a finished display panel. This setup does not require precise alignment design, which is beneficial for the actual mass production design extension of metasurface technology.

[0084] In the above embodiment, the base wafer 10 serves as the basis for subsequent dry etching processes. It can be constructed by placing silicon nitride material on a glass cover plate 11, thereby transferring the metasurface structure pillar 4 onto the base wafer 10. Of course, the fabrication method of the base wafer in this embodiment is merely an example.

[0085] In some embodiments, such as Figure 8B As shown, the metasurface structure pillars can also be connected to the substrate in the following ways:

[0086] B1, Prepare OLED substrate 1.

[0087] B2 utilizes nanoimprint technology to imprint metasurface structures onto a substrate wafer.

[0088] B3, bonding the OLED substrate 1 and the substrate wafer.

[0089] B4, cut out the finished display panel.

[0090] In the above embodiments, the OLED substrate 1 can be prepared using existing mature technologies. After preparing the OLED substrate 1, nanoimprint technology is used. Figure 8B The NIL identifier in the image is combined with dry etching technology. Figure 8B The metasurface structure is first imprinted onto the substrate wafer (Dry etch logo in the image). After the substrate wafer is flattened, it is bonded to the OLED substrate 1 using adhesives such as resin. Finally, the finished display panel with the metasurface structure is cut out. Compared with the deployment of MicroLENS, this setup does not require precise alignment design, which helps to reduce the overall precision of the manufacturing process and facilitates the actual mass production design extension of metasurface technology.

[0091] In the above embodiment, the substrate wafer serves as a basis for subsequent dry etching processes. It can be constructed by placing silicon nitride material on a glass cover plate 11, thereby transferring the metasurface structure pillar 4 onto the substrate wafer. Of course, the fabrication method of the substrate wafer in this embodiment is only an example, and the substrate wafer can be constructed using the same materials as the base wafer 10.

[0092] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this disclosure (including the claims) is limited to these examples; within the framework of this invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in the details for the sake of brevity.

[0093] The embodiments of this invention are intended to cover all such substitutions, modifications, and variations falling within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A display panel, characterized in that, include: Substrate; Multiple pixel units are located on the substrate, and at least one pixel unit includes multiple sub-pixels, wherein the multiple sub-pixels emit different colors. A color filter film is located on the side of the pixel unit away from the substrate, and the color filter film corresponds one-to-one with the sub-pixel; Multiple light-control regions are located on the light-emitting side of the pixel unit, and the light-control regions are arranged sequentially at intervals along the center to the edge of the substrate. At least a portion of the light-control regions are provided with light-controlling elements, and at least a portion of the light-controlling elements are respectively provided with different preset deflection angles. The light-controlling elements are configured to refract the light emitted by the pixel unit so that the light is emitted in a preset direction. The light-controlling elements include polarizing prisms or metasurface structures. The light-controlling elements are located on the light-emitting side of the color filter film. The deflection angle of the light refracted by each light-controlling region gradually increases along the center to the edge of the substrate. A microlens array layer is located between the color filter film and the light control element, and the microlens array layer is correspondingly arranged with the color filter film.

2. The display panel according to claim 1, characterized in that, The light-controlled region is configured as an annular region centered on the center point of the substrate, and the annular width of each light-controlled region is the same.

3. The display panel according to claim 1, characterized in that, The light control element is configured in a one-to-one correspondence with the pixel unit.

4. The display panel according to claim 1, characterized in that, The light control element includes a polarizing prism, which comprises a plurality of straight prisms whose thickness decreases sequentially from the center to the edge of the substrate.

5. The display panel according to claim 4, characterized in that, Each of the polarizing prisms has the same thickness on the side closest to the center of the substrate.

6. The display panel according to claim 1, characterized in that, The light-controlling element includes a metasurface structure, which comprises multiple nanopillars of different diameters. In the same light-controlling region, the diameter of each nanopillar gradually decreases from the center to the edge of the substrate.

7. The display panel according to claim 6, characterized in that, The substrate is provided with at least two layers of the metasurface structure along the direction of light propagation path, and the adjacent layers of the metasurface structure are matched with different preset wavebands.

8. The display panel according to claim 6, characterized in that, It also includes a base wafer, on which the light control element can be imprinted using nanoimprint technology, and the base wafer is configured to be connected to the light-emitting side of the pixel unit.

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