Projection system

Abstract

The embodiment of the invention provides a projection system, and relates to the technical field of display. The projection system comprises a driving substrate, a light-emitting assembly and a light combination unit, the light-emitting assembly is connected to one side of the driving substrate, and the light-emitting assembly comprises a first screen, a second screen and a third screen; the first screen, the second screen and the third screen are respectively used for emitting first light, second light and third light which are different in color wavelength (color); the light combining unit is located in a light emitting path of the light emitting assembly; the first light, the second light and the third light are incident to the light combining unit at different angles, and the light combining unit combines the first light, the second light and the third light according to the dispersion principle. Therefore, the light-emitting assemblies are located on the same side of the light combination unit, the structure of the projection system is simplified, the size is reduced, and integration and miniaturization of equipment are facilitated.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of display technology. More specifically, it relates to a projection system. Background Art

[0002] In the related art, in order to achieve colorization in MicroLED projection display technology, three MicroLED screens can be used to separately display images of three colors: red, green, and blue, and then color is achieved through a light combining prism. However, the light combining prism needs to be arranged between the three MicroLED screens and also cover the light output area of all the micro display screens, resulting in a relatively large volume of the light combining prism and making it difficult to achieve integration and miniaturization. Summary of the Invention

[0003] An exemplary embodiment of the present application provides a projection system. The light combining unit of the projection system combines light using the principle of dispersion, and the light emitting components are all located on the same side of the light combining unit, which is beneficial to simplifying the structure and reducing the volume, and is easy to achieve integration and miniaturization.

[0004] The embodiments of the present application provide a projection system, including:

[0005] A driving substrate;

[0006] A light emitting component, connected to one side of the driving substrate, and the light emitting component includes a first screen, a second screen, and a third screen; the first screen, the second screen, and the third screen are respectively used to emit first light, second light, and third light with different colors;

[0007] A light combining unit, located in the light output path of the light emitting component;

[0008] Wherein, the first light, the second light, and the third light are respectively incident on the light combining unit at different angles, and the light combining unit combines the first light, the second light, and the third light using the principle of dispersion.

[0009] As can be seen from the above technical solutions, in the projection system provided by the embodiments of the present application, the light combining unit combines the first light, the second light, and the third light with different wavelengths (colors) using the principle of dispersion, achieving color display; at the same time, the light emitting component (including the first screen, the second screen, and the third screen) is located on the same side of the light combining unit, simplifying the structure of the projection system and reducing the volume, which is beneficial to the integration and miniaturization of the device. Description of the Drawings

[0010] To more clearly illustrate the embodiments of the present application or the implementation manners in the related art, the following will briefly introduce the drawings required for use in the description of the embodiments or the related art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings.

[0011] Figure 1 Shows a schematic structural diagram of a projection system in the related art;

[0012] Figure 2 Shows a schematic structural diagram of a projection system provided by an embodiment of the present application;

[0013] Figure 3 Shows a schematic diagram of the principle of dispersion provided by an embodiment of the present application;

[0014] Figure 4 Shows a light combination effect diagram of a light combination unit provided by an embodiment of the present application;

[0015] Figure 5 Shows a schematic structural diagram of a light combination unit provided by an embodiment of the present application;

[0016] Figure 6 Shows a schematic structural diagram of another light combination unit provided by an embodiment of the present application;

[0017] Figure 7 Shows a schematic structural diagram of yet another light combination unit provided by an embodiment of the present application;

[0018] Figure 8 Shows a light combination effect diagram of a light combination unit provided by an embodiment of the present application;

[0019] Figure 9 Shows a schematic structural diagram of another projection system provided by an embodiment of the present application;

[0020] Figure 10 Shows a schematic structural diagram of yet another projection system provided by an embodiment of the present application;

[0021] Figure 11 Shows a schematic structural diagram of yet another projection system provided by an embodiment of the present application;

[0022] Figure 12 Shows a schematic structural diagram of yet another projection system provided by an embodiment of the present application;

[0023] Figure 13 Shows a schematic structural diagram of yet another projection system provided by an embodiment of the present application;

[0024] Figure 14 Shows a schematic structural diagram of yet another projection system provided by an embodiment of the present application;

[0025] Figure 15 Shows the structural schematic diagram of the liquid crystal deflector in the embodiment of the present application when no voltage is applied;

[0026] Figure 16 Shows the structural schematic diagram of the liquid crystal deflector in the embodiment of the present application when voltage is applied;

[0027] Figure 17 Shows Figure 16 The equivalent structural schematic diagram of the shown liquid crystal deflector;

[0028] Figure 18 Shows the structural schematic diagram of another projection system in the embodiment of the present application;

[0029] Figure 19 Shows the structural schematic diagram of another projection system in the embodiment of the present application;

[0030] Figure 20 Shows the structural schematic diagram of another projection system in the embodiment of the present application;

[0031] Figure 21 Shows the structural schematic diagram of another projection system in the embodiment of the present application;

[0032] Figure 22 Shows the structural schematic diagram of another projection system in the embodiment of the present application;

[0033] Figure 23 Shows the structural schematic diagram of another projection system in the embodiment of the present application. Detailed implementation manners

[0034] To make the purpose and implementation manners of the present application clearer, the following will clearly and completely describe the exemplary implementation manners of the present application in conjunction with the drawings in the exemplary embodiments of the present application. Obviously, the described exemplary embodiments are only a part of the embodiments of the present application, rather than all of the embodiments.

[0035] It should be noted that the brief description of the terms in the present application is only for the convenience of understanding the following described implementation manners, rather than intending to limit the implementation manners of the present application. Unless otherwise specified, these terms should be understood according to their ordinary and common meanings.

[0036] The terms "including" and "having" and any of their variations are intended to cover but not exclusively include. For example, a product or device including a series of components does not necessarily have to be limited to all the clearly listed components, but may include other components that are not clearly listed or are inherent to these products or devices.

[0037] Combined with the background art section, such as Figure 1As shown, in this projection system, three Micro LED screens (11', 12', and 13') emit light of different wavelengths, such as light of three colors: red, green, and blue (RGB). The combining prism 2' is square as a whole, and the three Micro LED screens are located at different orientations of the combining prism 2'. The combining prism 2' combines the light emitted by the three Micro LED screens through reflection and / or refraction, so as to realize the combination of light of three colors. The light emitted after passing through the combining prism 2' is used for imaging. However, this structural layout method results in a relatively large volume of the combining prism 2', making it difficult to achieve integration and miniaturization.

[0038] To solve the above technical problems, an embodiment of the present application provides a projection system, including: a driving substrate; a light-emitting component connected to one side of the driving substrate, the light-emitting component including a first screen, a second screen, and a third screen; the first screen, the second screen, and the third screen are respectively used to emit first light, second light, and third light with different color wavelengths (colors); a combining unit located in the light-emitting path of the light-emitting component; wherein, the first light, the second light, and the third light are respectively incident on the combining unit at different angles, and the combining unit combines the first light, the second light, and the third light by using the dispersion principle. Thus, the combining unit combines the first light, the second light, and the third light with different wavelengths (colors) by using the dispersion principle, realizing color display; at the same time, the light-emitting component (including the first screen, the second screen, and the third screen) is located on the same side of the combining unit, simplifying the structure of the projection system and reducing the volume, which is beneficial to the integration and miniaturization of the device.

[0039] The following will exemplarily describe the projection system provided by the embodiment of the present application with reference to the accompanying drawings.

[0040] In some embodiments, as Figure 2 shown, the projection system includes: a driving substrate 1, a light-emitting component 2, and a combining unit 3.

[0041] Among them, the light-emitting component 2 is located on one side of the driving substrate 1 and is electrically connected to the driving substrate 1. The driving substrate 1 is used to provide a driving signal and power supply to the light-emitting component 2. The driving substrate 1 can adopt all types of driving substrates known to those skilled in the art, such as a thin film transistor (TFT) active driving substrate or a complementary metal oxide semiconductor (CMOS) driving substrate, which is not limited herein.

[0042] The light emitting assembly 2 includes a first screen 21, a second screen 22, and a third screen 23 for emitting light of different wavelengths (colors), wherein the first screen 21 is used to emit the first light, the second screen 22 is used to emit the second light, and the third screen 23 is used to emit the third light. Exemplarily, the first light, the second light, and the third light are respectively one of red, green, and blue (RGB), and the colors of the three lights are different, for example, the first light includes red light, the second light includes green light, and the third light includes blue light.

[0043] It should be noted that the embodiment of the present application does not limit the arrangement mode, arrangement order and light color of the first screen 21, the second screen 22 and the third screen 23. The accompanying drawings only exemplarily show that the first screen 21, the second screen 22 and the third screen 23 are arranged side by side in the order of red, green and blue on the same side of the driving substrate 1. They can also be arranged in other orders (such as green, red and blue or red, blue and green, etc.). The first screen 21, the second screen 22 and the third screen 23 can also emit light of colors other than red, green and blue, such as orange. The light-emitting component 2 may include a single Micro LED lamp bead, or may include a screen formed by an array of multiple Micro LED lamp beads, which is not limited here.

[0044] Among them, the light combining unit 3 is located in the light emitting path of the light emitting component 2, that is, located on the side of the light emitting component 2 away from the driving substrate 1, the first screen 21, the second screen 22 and the third screen 23 are all located in the same position of the light combining unit 3, and the light combining unit 3 can be set to a narrow strip shape, covering the light emitting area of ​​the first screen 21, the second screen 22 and the third screen 23, thereby reducing the volume of the light combining unit, simplifying the projection system structure and reducing the volume, which is conducive to the integration and miniaturization of the equipment.

[0045] The first light, the second light and the third light emitted by the light emitting component 2 are incident on the light combining unit 3 at different angles respectively, and the light combining unit 3 combines the first light, the second light and the third light by using the dispersion principle.

[0046] The complex light includes a plurality of different wavelengths (colors) of light. When the complex light enters the light combining unit 3, the complex light is refracted on the interface of the light combining unit 3. The light combining unit 3 has different refractive indices for light of different wavelengths. The different colors of light are separated from each other due to the different refraction angles formed, that is, dispersion occurs, and the complex light is decomposed into multiple monochromatic lights. Figure 3 As shown, the complex light is incident on the light combining unit 3 from left to right, and is decomposed into three monochromatic lights, namely, the first light, the second light and the third light, by the light combining unit 3. The refraction angles of the first light, the second light and the third light are different, and the focal length of the first light is f 1 , the focal length of the second ray f 2 and the focal length f of the third ray 3 Also different.

[0047] The relationship between the wavelength of the monochromatic light obtained after dispersion and the wavelength of the incident polychromatic light is shown by the following formula:

[0048] f(λ)λ = f 0 λ 0 ;

[0049] where λ represents the wavelength of the monochromatic light, f(λ) represents the focal length of the monochromatic light, λ 0 represents the central wavelength of the polychromatic light, and f 0 is the focal length corresponding to the central wavelength of the polychromatic light.

[0050] Utilizing the reversibility of the light path, when monochromatic lights of multiple different wavelengths are incident on the light combining unit 3 at different angles (or focal lengths), that is, the incident direction is from right to left, the monochromatic lights will refract along the original incident direction in reverse. The refraction path of the monochromatic lights is the same as that of the composite light. Multiple monochromatic lights pass through the light combining unit 3 to form a polychromatic light, achieving light combination. As Figure 4 shown, according to the dispersion principle, the light combining unit 3 has different refractive indices for the first light ray, the second light ray, and the third light ray. When the first light ray, the second light ray, and the third light ray of different wavelengths are incident on the light combining unit 3 at different angles, the first light ray, the second light ray, and the third light ray propagate along the reverse dispersion path in the light combining unit 3 and exit at the same position on the left side of the light combining unit 3, thereby achieving the light combination of the first light ray, the second light ray, and the third light ray to form a polychromatic light, and the polychromatic light is used to display a color picture.

[0051] In this embodiment, by separately controlling the brightness of the first screen 21, the second screen 22, and the third screen 23, the mixing ratio of the first light ray, the second light ray, and the third light ray in the light combination is adjusted, so that the light combination presents different colors, thereby realizing the display of a color picture. The brightness of the first screen 21, the second screen 22, and the third screen 23 can be controlled by adjusting the driving voltage or driving current.

[0052] In some embodiments, the light combining unit 3 includes a microstructured surface, and the microstructured surface includes a diffractive surface and / or a Fresnel surface. Utilizing the diffraction principle, the first light ray / second light ray / third light ray is imaged at different positions, thereby achieving the light splitting effect.

[0053] In some embodiments, as Figures 5 - 7 shown in any figure, the light combining unit 3 includes a metasurface lens. The metasurface lens has a metasurface with a subwavelength thickness, and the metasurface is provided with micro-nano structures. By adjusting parameters such as the shape, size, and structural unit period of the micro-nano structures, the light combining effect of the metasurface lens is controlled.

[0054] Exemplarily, as Figure 5As shown, the metasurface of the metalens includes a series of zigzag grooves, and the inclination angle of each groove is different.

[0055] Exemplarily, as Figure 6 shown, the metasurface of the metalens includes a diffraction structure, and a relief is provided on the surface of the diffraction structure. The relief can be formed on the diffraction layer by etching, and the depth of the relief is at the sub-micron level.

[0056] Exemplarily, as Figure 7 shown, the metasurface of the metalens includes micro-nano structures with irregular shapes.

[0057] It should be noted that Figures 5 - 7 only the shape of the micro-nano structure is shown exemplarily, but it does not limit the projection system provided by the embodiments of the present application. In other embodiments, the micro-nano structure of the metalens can be flexibly set according to requirements, and it is not limited here.

[0058] Exemplarily, as Figure 8 shown, the first light ray, the second light ray, and the third light ray are incident on the metalens at different angles. The first light ray, the second light ray, and the third light ray propagate along the dispersion reverse path in the metalens, and the three monochromatic lights form a composite light, realizing the combination of the first light ray, the second light ray, and the third light ray, thereby realizing the display of a color picture.

[0059] In some embodiments, the longer the wavelength of the light ray, the smaller the refractive index of the combining unit 3 for the light ray. The wavelength of the first light ray is greater than the wavelength of the second light ray, and the wavelength of the second light ray is greater than the wavelength of the third light ray. Then, the refractive index of the combining unit 3 for the first light ray is the smallest, the refractive index for the third light ray is the largest, and the refractive index for the second light ray is in the middle; in order to achieve light combination, according to the refraction equation n 1 ×sinθ 1 =n 2 ×sinθ 2 , it is necessary to control the incident angle of the first light ray to be greater than the incident angle of the second light ray, and the incident angle of the second light ray to be greater than the incident angle of the third light ray, that is, the incident angle of the first light ray > the incident angle of the second light ray > the incident angle of the third light ray.

[0060] Exemplarily, the first light ray includes a red light ray, the second light ray includes a green light ray, and the third light ray includes a blue light ray. The wavelength of the red light ray > the wavelength of the green light ray > the wavelength of the blue light ray. The refractive index of the combining unit 3 for the red light ray is the smallest, the refractive index for the blue light ray is the largest, and the refractive index for the blue light ray is in the middle. To achieve light combination, the incident angle sorting of the red, green, and blue light rays is: the incident angle of the red light ray > the incident angle of the green light ray > the incident angle of the blue light ray.

[0061] In some embodiments, as Figures 9 - 12As shown in any of the figures, the projection system further includes: a light deflection unit 4.

[0062] Among them, the function of the light deflection unit 4 is to change the propagation direction of light in space, deflect the light by a preset angle from the original propagation direction, so as to change the incident angle of the light to the light combining unit 3. The light deflection unit 4 is located in the optical path between the light emitting component 2 and the light combining unit 3, and is used to deflect the first light ray, the second light ray and the third light ray emitted by the light emitting component 2, change the original propagation directions of the first light ray, the second light ray and the third light ray, and the deflected first light ray, second light ray and third light ray are incident on the light combining unit 3 at different angles respectively.

[0063] The light deflection unit 4 includes a mechanical deflector and a non-mechanical deflector. The mechanical deflector includes at least one of a fast steering mirror, a galvanometer, a multi-faceted rotating mirror, a micro-electro-mechanical system (MEMS) scanning mirror and a Bragg grating. The non-mechanical deflector includes at least one of an electro-optic deflector, an acousto-optic deflector and a liquid crystal deflector.

[0064] Exemplarily, as Figure 9 or Fig. 10 shows, the directions of the first light ray, the second light ray and the third light ray emitted by the light emitting component 2 are the same, and all emit light in the direction perpendicular to the plane where the driving substrate is located; the light combining unit 3 is located in the upper left of the light emitting component 2, and the plane where the light combining unit 3 is located is perpendicular to the plane where the driving substrate 1 is located. The first light ray, the second light ray and the third light ray are respectively deflected to the left by different angles through the light deflection unit 4, so as to realize that the first light ray, the second light ray and the third light ray are incident on the light combining unit 3 at different angles.

[0065] Exemplarily, as Figure 11 or Fig. 12 shows, the directions of the first light ray, the second light ray and the third light ray emitted by the light emitting component 2 are the same, and all emit light in the direction perpendicular to the plane where the driving substrate is located; the light combining unit 3 is located above the light emitting component 2, and the plane where the light combining unit 3 is located is parallel to the plane where the driving substrate 1 is located. The first light ray, the second light ray and the third light ray are respectively deflected to the right by different angles through the light deflection unit 4, so as to realize that the first light ray, the second light ray and the third light ray are incident on the light combining unit 3 at different angles.

[0066] It should be noted that Figures 9 - 12 only the relative positional relationship between the light emitting component 2 and the light combining unit 3 is shown exemplarily, but it does not constitute a limitation on the projection system provided by the embodiments of the present application. In other embodiments, the positions of the light emitting component 2 and the light combining unit 3 can be set according to requirements. For example, the light combining unit 3 can be set in the upper right of the light emitting component 2, which is not limited here.

[0067] In some embodiments, as Figures 9 - 12As shown in any of the figures, the light deflection unit 4 includes a first deflection part 41, a second deflection part 42 and a third deflection part 43. The first deflection part 41 corresponds to the first screen 21 and is used to deflect the first light emitted from the first screen 21 by a first angle α. The second deflection part 42 corresponds to the second screen 22 and is used to deflect the second light emitted from the second screen 22 by a second angle β. The third deflection part 43 corresponds to the third screen 23 and is used to deflect the third light emitted from the third screen 23 by a second angle γ, so that the incident angles of the deflected first light, second light and third light satisfy: the incident angle of the first light > the incident angle of the second light > the incident angle of the third light.

[0068] Exemplarily, as Figure 9 or 10 shows, the first screen 21, the second screen 22 and the third screen 23 all emit light in a direction perpendicular to the plane where the driving substrate 1 is located. The plane where the light combining unit 3 is located is perpendicular to the plane where the driving substrate 1 is located. The first deflection part 41 deflects the first light by a first angle α, the second deflection part 42 is used to deflect the second light by a second angle β, and the third deflection part 43 deflects the third light by a third angle γ. Among them, the deflection angle of the light is complementary to the incident angle of the corresponding light, that is, the first light is incident on the light combining unit 3 at (90° - α), the second light is incident on the light combining unit 3 at (90° - β), and the third light is incident on the light combining unit 3 at (90° - γ). The first angle α < the second angle β < the third angle γ, satisfying the incident angle of the first light > the incident angle of the second light > the incident angle of the third light.

[0069] Exemplarily, as Figure 11 or 12 shows, the first screen 21, the second screen 22 and the third screen 23 all emit light in a direction perpendicular to the plane where the driving substrate is located. The plane where the light combining unit 3 is located is parallel to the plane where the driving substrate 1 is located. The first deflection part 41 deflects the first light by a first angle α, the second deflection part 42 is used to deflect the second light by a second angle β, and the third deflection part 43 deflects the third light by a third angle γ. Among them, the deflection angle of the light is equal to the incident angle of the corresponding light, that is, the first light is incident on the light combining unit 3 at the first angle α, the second light is incident on the light combining unit 3 at the second angle β, and the third light is incident on the light combining unit 3 at the third angle γ. The first angle α > the second angle β > the third angle γ, satisfying the incident angle of the first light > the incident angle of the second light > the incident angle of the third light.

[0070] In some embodiments, as Figure 13 or 14 shows, on the basis of the projection system shown in Figure 12 narrowing the distance between the light deflection unit 4 and the light combining unit 3 is beneficial to realizing the integration and miniaturization of the device.

[0071] In some embodiments, the light deflection unit 4 includes a liquid crystal deflector.

[0072] Among them, compared with other types of light deflection devices, the liquid crystal deflector has a high modulation accuracy for light, which is beneficial to controlling the light combining effect.

[0073] The working principle of the liquid crystal deflector is as Figures 15 - 16 shown. The liquid crystal deflector includes two relatively arranged glass substrates 401 and liquid crystal molecules 402 located between the two glass substrates 401. High-impedance control electrodes 403 and low-impedance ground electrodes 404 are respectively arranged on the inner surfaces of the two glass substrates 401. By controlling the voltage on the high-impedance control electrode 403, the arrangement state of the liquid crystal molecules 402 is changed, so that the refractive index of the liquid crystal deflector changes, thereby changing the exit angle of the incident light. Specifically: as Figure 15 shown, when no voltage is applied to the high-impedance control electrode 403 (i.e., V(t)=0), for example, the liquid crystal molecules are arranged in the vertical direction. When the incident light passes through the liquid crystal molecules, the liquid crystal molecules do not deflect the propagation angle of the incident light, that is, the incident light and the exit light are parallel. As Figure 16 shown, when a voltage is applied to the high-impedance control electrode 403 (i.e., V(t)=Vcos(2πft)), the arrangement direction of the liquid crystal molecules changes and rotates to a preset angle along a preset direction. For example, the liquid crystal molecules are arranged in the horizontal direction. When the incident light passes through the liquid crystal molecules, the liquid crystal molecules deflect the propagation angle of the incident light, that is, the included angle between the exit light and the incident light is the deflection angle θ.

[0074] When a voltage is applied to the high-impedance control electrode 403, as Figure 17 shown, the liquid crystal deflector can be equivalent to two prisms with different refractive indexes. The incident light is a collimated light. When passing through the interface of the two prisms, due to the difference in refractive index, the propagation direction of the light deflects, and the exit light is no longer a collimated light. Compared with the incident light, the deflection angle of the exit light satisfies the following formula:

[0075] (2πD / λ)sinθ = ΔΦ = Φ D -Φ 0 ;

[0076] Among them, λ represents the wavelength of the light, θ represents the deflection angle, and ΔΦ represents the thickness of the equivalent prism.

[0077] In other embodiments, the light deflection unit 4 further includes other components with light deflection functions known to those skilled in the art, such as, for example, optoelectronic deflectors, acousto-optic deflectors, fast steering mirrors, and MEMS scanning mirrors, etc., which are not limited herein.

[0078] In some embodiments, as Figure 14 shown, the projection system further includes: a polarizer 6.

[0079] In this embodiment, since the liquid crystal deflector can only change the propagation direction of polarized light, a polarizer 6 is disposed in the optical path between the liquid crystal deflector and the light-emitting component 2. The polarizer 6 is used to convert the light emitted from the light-emitting component 2 into polarized light. After passing through the liquid crystal deflector, the propagation direction of the polarized light is deflected by a preset angle, thereby changing the incident angle of the light to the light combining unit 3.

[0080] In some embodiments, the polarizer 6 includes a dichroic polarizing lens and / or a wire grid polarizing lens.

[0081] In some embodiments, as Figures 18 - 21 shown in any of the figures, in this projection system, the angle between the light-emitting surface of the first screen 21 and the plane where the driving substrate 1 is located is a first preset angle a; the angle between the light-emitting surface of the second screen 22 and the plane where the driving substrate 1 is located is a second preset angle b; the angle between the light-emitting surface of the third screen 23 and the plane where the driving substrate 1 is located is a third preset angle c, such that the incident angles of the first light, the second light, and the third light at the light combining unit 3 satisfy: the incident angle of the first light > the incident angle of the second light > the incident angle of the third light. Among them, the first preset angle a, the second preset angle b, and the third preset angle c are not equal.

[0082] With such a setting, by only rotating each screen in the light-emitting component 2 by a preset angle, the first light, the second light, and the third light are incident on the light combining unit 3 at different angles, without the need to add components, which is not only beneficial to simplifying the system structure but also beneficial to reducing costs.

[0083] Exemplarily, as Figure 18 shown in FIG. 17 or 19, the first screen 21, the second screen 22, and the third screen 23 all emit light in a direction perpendicular to the plane where the driving substrate 1 is located. The plane where the light combining unit 3 is located is perpendicular to the plane where the driving substrate 1 is located. The first screen 21, the second screen 22, and the third screen 23 are respectively tilted by a preset angle in the direction towards the light combining unit 3 (i.e., the upper left), such that the angle between the light-emitting surface of the first screen 21 and the plane where the driving substrate 1 is located is a first preset angle a; the angle between the light-emitting surface of the second screen 22 and the plane where the driving substrate 1 is located is a second preset angle b; the angle between the light-emitting surface of the third screen 23 and the plane where the driving substrate 1 is located is a third preset angle c; among them, the rotation angle of the screen (i.e., the angle between the light-emitting surface of the screen and the plane where the driving substrate 1 is located) is complementary to the incident angle of the corresponding light, that is, the first light is incident on the light combining unit 3 at (90° - a), the second light is incident on the light combining unit 3 at (90° - b), the third light is incident on the light combining unit 3 at (90° - c), and the first preset angle a < the second preset angle b < the third preset angle c, satisfying the incident angle of the first light > the incident angle of the second light > the incident angle of the third light.

[0084] Exemplarily, as Figure 20 or as shown in FIG. 21, the first screen 21, the second screen 22, and the third screen 23 all emit light rays in a direction perpendicular to the plane where the driving substrate 1 is located. The plane where the light combining unit 3 is located is parallel to the plane where the driving substrate 1 is located. The first screen 21, the second screen 22, and the third screen 23 are respectively inclined by a preset angle in the direction towards the light combining unit 3 (i.e., the upper right), so that the angle between the light emitting surface of the first screen 21 and the plane where the driving substrate 1 is located is the first preset angle a; the angle between the light emitting surface of the second screen 22 and the plane where the driving substrate 1 is located is the second preset angle b; the angle between the light emitting surface of the third screen 23 and the plane where the driving substrate 1 is located is the third preset angle c; wherein, the rotation angle of the screen (i.e., the angle between the light emitting surface of the screen and the plane where the driving substrate 1 is located) is equal to the incident angle of the corresponding light ray, that is, the first light ray is incident on the light combining unit 3 at the first preset angle a, the second light ray is incident on the light combining unit 3 at the second preset angle b, the third light ray is incident on the light combining unit 3 at the third preset angle c, and the first preset angle a > the second preset angle b > the third preset angle c, satisfying that the incident angle of the first light ray > the incident angle of the second light ray > the incident angle of the third light ray.

[0085] In some embodiments, as Figure 10 , 12 -14, 19, and any one of FIGS. 21 shows, the projection system further includes: a collimating lens 5, and the collimating lens 5 is located in the optical path between the light emitting component 2 and the light combining unit 3, and is used for collimating the light rays emitted by the light emitting component 2.

[0086] Wherein, the first screen 21, the second screen 22, and the third screen 23 can respectively correspond to a collimating lens 5, or the first screen 21, the second screen 22, and the third screen 23 can also share a collimating lens 5, and this is not limited herein.

[0087] In some embodiments, as Figure 22 or as shown in FIG. 23, the projection system further includes: a projection lens 7, and the projection lens 7 is located in the light emitting optical path of the light combining unit 3, and is used for imaging the light rays emitted by the light combining unit 3.

[0088] Exemplarily, as Figure 22 shown, in this projection system, the light emitting component 2 as the light source includes the first screen 21, the second screen 22, and the third screen 23. The first screen 21 emits red light rays, the second screen 22 emits green light rays, and the third screen 23 emits blue light rays. The red, green, and blue light rays are incident on the light combining unit 3 at different angles; the light combining unit 3 includes a metasurface lens, and its surface is provided with micro-nano structures. Using the principle of dispersion, the red, green, and blue light rays are combined along the inverse path of dispersion; after passing through the light combining unit 3, the combined light directly enters the projection lens 7 for projection.

[0089] Exemplarily, asFigure 23 As shown, in this projection system, the focal lengths of the first light ray, the second light ray, and the third light ray are different, and they are incident on the light combining unit 3 at different angles respectively. The light combining unit 3 includes a metasurface lens, and its surface is provided with micro-nano structures. Using the dispersion principle, the three light rays are combined along the reverse dispersion path; after passing through the light combining unit 3, the combined light directly enters the projection lens 7 for projection, realizing the display of a color picture.

[0090] It should be noted that Figures 22 - 23 only the core component structures such as the light emitting component 2, the light combining unit 3, and the projection lens 7 of the projection system are shown exemplarily. The projection system may further include at least one of a collimating lens 5, a driving substrate 1, a light ray deflection unit 4, and a polarizer 6.

[0091] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

[0092] For the sake of convenience of explanation, the above description has been made in combination with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. According to the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are for better explaining the principles and actual applications, so that those skilled in the art can better use the embodiments and various different modified embodiments suitable for specific use considerations.

Claims

1. A projection system, characterized in that, comprising: a driving substrate; a light-emitting component connected to one side of the driving substrate, the light-emitting component including a first screen, a second screen, and a third screen; the first screen, the second screen, and the third screen are respectively configured to emit first light, second light, and third light with different wavelengths; a light combining unit located in the light-emitting path of the light-emitting component; wherein, the first light, the second light, and the third light are respectively incident on the light combining unit at different angles, and the light combining unit combines the first light, the second light, and the third light by using the principle of dispersion.

2. The projection system according to claim 1, characterized in that, the wavelength of the first light is greater than the wavelength of the second light, the wavelength of the second light is greater than the wavelength of the third light, and the incident angle of the first light > the incident angle of the second light > the incident angle of the third light.

3. The projection system according to claim 2, characterized in that, further comprising: a light deflection unit located in the optical path between the light-emitting component and the light combining unit, configured to deflect the first light, the second light, and the third light emitted by the light-emitting component, and the deflected first light, second light, and third light are respectively incident on the light combining unit at different angles.

4. The projection system according to claim 3, characterized in that, the light deflection unit includes: a first deflection portion configured to deflect the first light by a first angle α; a second deflection portion configured to deflect the second light by a second angle β; a third deflection portion configured to deflect the third light by a third angle γ, wherein, the first angle α > the second angle β > the third angle γ, or, the first angle α < the second angle β < the third angle γ.

5. The projection system according to claim 3, characterized in that, the light deflection unit includes a liquid crystal deflector.

6. The projection system according to claim 5, characterized in that, further comprising: a polarizer located in the optical path between the light-emitting component and the liquid crystal deflector, configured to convert the light emitted by the light-emitting component into polarized light.

7. The projection system according to claim 2, characterized in that, the included angle between the light-emitting surface of the first screen and the plane where the driving substrate is located is a first preset angle a; the included angle between the light-emitting surface of the second screen and the plane where the driving substrate is located is a second preset angle b; the included angle between the light-emitting surface of the third screen and the plane where the driving substrate is located is a third preset angle c; wherein, the first preset angle a > the second preset angle b > the third preset angle c, or, the first preset angle a < the second preset angle b < the third preset angle c.

8. The projection system according to any one of claims 1-7, characterized in that, the light combining unit includes a metasurface lens.

9. The projection system according to any one of claims 1-7, characterized in that, further comprising: a collimating lens located in the optical path between the light-emitting component and the light combining unit, configured to collimate the light emitted by the light-emitting component.

10. The projection system according to any one of claims 1-7, characterized in that, further comprising: a projection lens, located in the light-emitting optical path of the light combining unit, for imaging the light emitted by the light combining unit.

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