Illuminating system and projection equipment

Abstract

The invention relates to an illumination system and projection equipment, the illumination system comprises a light source and a lens, the light source is used for emitting light, the lens is arranged on the light emitting side of the light source, the lens comprises a light incident surface facing the light source and a light emitting surface opposite to the light incident surface, and the normalized spectrum of the light source meets a certain condition. Therefore, the spectrums of light rays irradiated by the light source to all points on an illumination surface through the lens are consistent. The system can adjust the spectrum of the light emitted by the light source, reduces the color difference between the center and the periphery of a picture formed by the illumination system, adjusts the spectrum space distribution of the light emitted by the light source, and improves the color uniformity of an image formed by the projection equipment.

Description

Technical Field

[0001] The present application relates to the field of projection technology, and in particular to an illumination system and a projection device. Background Art

[0002] A single-chip LCD projection device is a projection product that uses a transmissive LCD panel to modulate the light emitted by an optical module to form an image, and then uses a projection lens to magnify the image and project it onto the projection area. Compared to projection devices based on other principles, such as DLP or LCoS, single-chip LCD projection devices are inexpensive and easy to make.

[0003] In the related art, a lighting system of a projection device uses a lens to diffuse the light emitted by a light source. However, as the position of the light-emitting point and the light-emitting angle are different, the optical path of the light in the lens is also different. The absorption coefficient of the lens medium for different wavelengths is different. Therefore, the color coordinates of the same spectrum will be different after passing through different optical paths, that is, the color is uneven, which is not conducive to improving the color uniformity of the lighting system and the display effect of the projection device. Summary of the invention

[0004] Based on this, the present application proposes an illumination system and a projection device, so as to improve the color uniformity of the illumination system and the display effect of the projection device.

[0005] According to one aspect of the present application, a lighting system is provided, the lighting system comprising:

[0006] A light source for emitting light;

[0007] A lens is disposed on the light-emitting side of the light source, and the lens has a light-entering surface facing the light source and a light-emitting surface opposite to the light-entering surface;

[0008] The lighting system comprises a lighting surface for receiving the light emitted by the lens, and the normalized spectrum of the light source satisfy:

[0009] ;

[0010] ;

[0011] ;as well as

[0012] ;

[0013] in, is the intensity of light emitted by the light source, is the angle of incidence of the light on the light source, λ is the wavelength of the light, D is the diameter of the lens, e is the distance between the axis of the lens and the illumination surface, α is the absorption coefficient of the medium of the lens, h is the distance between the incident position of the light on the illumination surface and the optical axis, x0 is the distance between the exit position of the light on the light exit surface and the light source in the direction parallel to the optical axis, y0 is the distance between the exit position of the light on the light exit surface and the light source in the first direction, x1 is the distance between the incident position of the light on the light entrance surface and the light source in the direction parallel to the optical axis, y1 is the distance between the incident position of the light on the light entrance surface and the light source in the first direction; the optical axis and the first direction are perpendicular to each other.

[0014] In one embodiment, the light incident surface of the lens is a convex surface, and the light emitting surface is a convex surface.

[0015] In one embodiment, the lens includes an optic having positive optical power.

[0016] In one embodiment, the light source includes a light emitting chip.

[0017] In one embodiment, the light emitting chip is configured such that the light intensity of the light emitted by the light emitting chip is adjustable.

[0018] In one embodiment, the light source includes a plurality of light-emitting areas, each of which includes a plurality of light-emitting chips arranged in an array, and the light-emitting chips in different light-emitting areas can be adjusted independently.

[0019] In one of the embodiments, a side of the light source facing the lens is coated with phosphor.

[0020] In one embodiment, the thickness and / or surface shape of the phosphor at different locations on the light source are different.

[0021] In one embodiment, the lighting system further comprises an optical functional device, the optical functional device comprises a liquid crystal layer or a collimating lens, and a side of the liquid crystal layer or the collimating lens facing the lens is a lighting surface.

[0022] According to another aspect of the present application, a projection device is provided, comprising the above-mentioned lighting system.

[0023] The above-mentioned lighting system and projection equipment, through the spectral spatial distribution of the light source related to parameters such as the lens diameter, the distance between the lens and the lighting surface, the absorption coefficient of the lens medium and the distance between the lens and the light source, can deduce the conditions that the spectral distribution of each point on the light source should meet if the color uniformity of the lighting system is to be improved based on the spectral spatial distribution, and then can select or set a suitable light source based on the condition to improve the color uniformity of the lighting system, which is beneficial to improving the display effect of the projection equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is the absorption spectrum of the medium.

[0025] FIG. 2 is a schematic diagram of the structure of the lighting system of the present application.

[0026] FIG. 3 is a light path diagram of the light in the lighting system of the present application.

[0027] Description of Figure Numbers:

[0028] 10. Lighting system;

[0029] 100, light source; 200, lens; 210, light incident surface; 220, light exiting surface; 300, lighting surface; 400, Fresnel lens;

[0030] F1, first direction. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0032] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0033] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0035] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0037] When light propagates in a medium, the bound electrons in the medium are forced to vibrate under the action of the electric field of the light wave, which is equivalent to the light wave consuming energy to excite the vibration of the electrons. Part of this energy is superimposed on the incident wave in the form of a secondary wave to form a transmitted light wave and then emitted from the medium. In addition, due to the interaction with the surrounding atoms and molecules, part of the energy of the forced vibration of the bound electrons is converted into other forms of energy, such as the energy of molecular thermal motion. This part of the energy loss is what we refer to as the absorption of light by the medium.

[0038] The absorption form of the medium can be described by introducing a complex refractive index. If the refractive index of the absorbing medium is:

[0039] ;

[0040] Then the plane wave electric field along the propagation direction of the light in the medium can be written as:

[0041] ;

[0042] The plane wave intensity is:

[0043] ;

[0044] Where, I0=|A| 2 , is the light intensity at z=0, that is, the light intensity at the distance the light propagates in the medium is 0, α=2nkw / c, which is called the absorption coefficient of the absorbing medium. The above formula is Lambert-Beer's law, which shows that the intensity of light waves decays exponentially with the distance they propagate in the medium, and the speed of decay depends on the absorption coefficient of the material.

[0045] Most substances have wavelength selectivity in the absorption of visible light. The selectivity of substance absorption can be expressed by the relationship curve between their absorption coefficient and wavelength, as shown in Figure 1. Within a certain wavelength range, the absorption of substances is very strong and has a maximum value. This absorption range is called an absorption band. In the projection system, the absorption of different wavelengths by the illumination system is one of the main reasons for the deviation of the picture color from the design value.

[0046] There are two common liquid crystal display (LCD) lighting systems: light cone lighting system and lens lighting system. For the lens system, the optical path of light in the lens is different with the different positions of the light-emitting point and the light-emitting angle, and the absorption coefficient of the lens medium for different wavelengths is different. Therefore, the color coordinates of the same spectrum will be different after passing through different optical paths, that is, color unevenness will occur.

[0047] Based on the above problems, the present application provides a lighting system 10 and a projection device, which can adjust the spectrum of the light emitted by the light source 100 based on the present application, reduce the chromatic aberration in the center and around the picture formed by the lighting system 10 of the present application, adjust the spectral spatial distribution of the light emitted by the light source 100, and improve the color uniformity of the image formed by the projection device. In particular, for some lighting systems 10 and projection devices that have the "rainbow" phenomenon, the present application can effectively weaken its "rainbow" phenomenon.

[0048] The lighting system of the present application may be a projection light machine or any other suitable lighting system for lighting or projection, that is, the lighting system of the present application is suitable for lighting systems including commercial lighting, engineering lighting, consumer lighting, etc., as well as various types of projections.

[0049] 2 and 3, the lighting system 10 provided in the present application includes a light source 100 and a lens 200. The light source 100 is used to emit light. The lens 200 is disposed on the light emitting side of the light source 100. The lens 200 has a light incident surface 210 facing the light source 100 and a light emitting surface 220 opposite to the light incident surface 210. The normalized spectrum of the light source 100 is satisfy:

[0050] ...Formula 1;

[0051] ...Formula 2;

[0052] ;as well as

[0053] ;

[0054] The lighting system 10 has a lighting surface 300 for receiving the light emitted by the lens 200. is the light intensity emitted by the light source 100, is the exit angle of the light on the light source 100, λ is the wavelength of the light, D is the diameter of the lens 200, e is the distance between the axis of the lens 200 and the illumination surface 300, α is the absorption coefficient of the medium of the lens 200, h is the distance between the incident position of the light on the illumination surface 300 and the optical axis, x0 is the distance between the exit position of the light on the light exit surface 220 and the light source 100 in a direction parallel to the optical axis, y0 is the distance between the exit position of the light on the light exit surface 220 and the light source 100 in the first direction F1, x1 is the distance between the incident position of the light on the light incident surface 210 and the light source 100 in a direction parallel to the optical axis, y1 is the distance between the incident position of the light on the light incident surface 210 and the light source 100 in the first direction F1, and the optical axis and the first direction F1 are perpendicular to each other.

[0055] It can be understood that the intensity of the light emitted from each position of the light source, the distance h between the incident position of the light on the lighting surface 300 and the optical axis, the distance x0 between the exit position of the light on the light exit surface 220 and the light source 100 in a direction parallel to the optical axis, the distance x1 between the incident position of the light on the light incident surface 210 and the light source 100 in a direction parallel to the optical axis, the distance y1 between the incident position of the light on the light incident surface 210 and the light source 100 in the first direction F1, and the distance y0 between the exit position of the light on the light exit surface 220 and the light source 100 in the first direction F1 may all be different. The present application designs the light source so that the light emitted from each position satisfies the above-mentioned relationship.

[0056] In the lighting system 10 and the projection device of the present application, when the spectrum distribution of the light source 100 satisfies the above formula 1 and formula 2, the spectrum of the light emitted by the light source 100 through the lens 200 to each point on the lighting surface 300 is the same, thereby improving the color uniformity of the light irradiated to the lighting surface 300. The present application adjusts the spectrum of the light emitted by the light source 100, reduces the chromatic aberration of the center and the surroundings of the picture formed by the lighting system 10 of the present application, adjusts the spectral spatial distribution of the light emitted by the light source 100, and improves the color uniformity of the image formed by the projection device.

[0057] As shown in FIG3 , in the lighting system 10, the light emitted by the light source 100 passes through the lens 200 and irradiates the lighting surface 300. The light incident on a point on the lighting surface 300 is formed by converging and integrating the light emitted from different points and at different angles on the light source 100. Since the optical path of the lens 200 passed by the integrated light at different points on the lighting surface 300 is inconsistent, and the absorption rate of the lens 200 itself to light of different wavelengths is different, the light spot on the lighting surface 300 will appear uneven in color.

[0058] Assuming that a light ray is emitted from a certain point on the light source 100 and irradiates a point on the illumination surface 300 at an angle θ, the intersection of the light emitting surface of the light source 100 and the optical axis is taken as the origin, the optical axis is taken as the x-axis, and the axis parallel to the first direction F1 is taken as the y-axis. Then, the propagation of the light ray from the lens 200 to the illumination surface 300 is simulated as a straight line L1 on the coordinate system. The straight line L1 can be expressed as:

[0059] ...Formula 3;

[0060] Among them, along the optical axis at the axis center, a is the distance from the light source 100 to the light incident surface 210 of the lens 200, b is the distance from the light exit surface 220 of the lens 200 to the illumination surface 300, d is the thickness of the lens 200, and a+b+d is the distance from the light source 100 to the illumination surface 300.

[0061] Assume that the light emitting surface 220 of the lens 200 conforms to: y=g(x) ...Formula 4;

[0062] The coordinates of the intersection point B between the light ray and the light emitting surface 220 and the angle between the light ray emitted from the light emitting surface 220 and the normal direction of the light emitting surface 220 can be obtained from Formula 3 and Formula 4: The value of (see the annotation in Figure 3) is recorded as:

[0063] B(x0,y0);

[0064] ;

[0065] According to the law of refraction:

[0066] ;

[0067] ;

[0068] in, is the angle between the light in the lens 200 and the normal direction of the light-emitting surface 220, and n is the refractive index of the lens 200. From the above formula, it can be seen that the angle between the light in the lens 200 and the normal direction of the light-emitting surface 220 is The angle between the light emitted from the light emitting surface 220 and the normal direction of the light emitting surface 220 relationship.

[0069] The propagation of light in the lens 200 is simulated as a straight line L2 on the coordinate system. Assuming the slope of the straight line L2 is k2, k2 satisfies:

[0070] ...Formula 5;

[0071] According to the above formula, the angle between the light in the lens 200 and the normal direction of the light emitting surface 220 is and the slope k2 of the straight line L2. At the same time, the above formula also shows the angle between the light in the lens 200 and the normal direction of the light emitting surface 220: and the relationship between the surface type g(x) of the light emitting surface 220 of the lens 200 .

[0072] The straight line L2 is:

[0073] ...Formula 6;

[0074] Assume that the surface shape of the light incident surface 210 of the lens 200 satisfies: ...Formula 7;

[0075] Then, according to Formula 6 and Formula 7, the coordinates of the intersection point A between the light ray and the light incident surface 210 can be written as: ;

[0076] And from the slope k2 of the straight line L2 and the surface shape of the light incident surface 210 of the lens 200 (Formula 7), we can get

[0077] ;

[0078] in, is the angle between the light in the lens 200 and the normal direction of the light incident surface 210. According to the above formula and formula 5, it can be known that the angle between the light in the lens 200 and the normal direction of the light incident surface 210 is and the angle between the light in the lens 200 and the normal direction of the light emitting surface 220 , so that the angle between the light in the lens 200 and the normal direction of the light incident surface 210 can be further known. The angle between the light emitted from the light emitting surface 220 and the normal direction of the light emitting surface 220 , and the angle between the light in the lens 200 and the normal direction of the light incident surface 210 and the relationship between the angle θ between the light irradiated onto the illumination surface 300 and the illumination surface 300.

[0079] Again, from the law of refraction:

[0080] ;

[0081] ;

[0082] in, is the angle between the light emitted by the light source 100 and the normal direction of the light incident surface 210. From the above formula, it can be known that the angle between the light emitted by the light source 100 and the normal direction of the light incident surface 210 is and the angle between the light in the lens 200 and the normal direction of the incident light surface 210 , and thus the angle between the light emitted by the light source 100 and the normal direction of the light incident surface 210 is known. and the relationship between the angle θ between the light irradiated onto the illumination surface 300 and the illumination surface 300.

[0083] The light emitted by the light source 100 is simulated as a straight line L3 on the coordinate system. If the slope of the straight line L3 is k3, then k3 satisfies:

[0084] ;

[0085] It can be obtained that the angle between the light emitted by the light source 100 and the light source 100 satisfies:

[0086] ;

[0087] in, is the angle between the light emitted by the light source 100 and the exit surface of the light source 100. According to the above two equations, it can be known that the angle between the light emitted by the light source 100 and the exit surface of the light source 100 is and the angle between the light in the lens 200 and the normal direction of the light emitting surface 220 , so that the angle between the light emitted by the light source 100 and the exit surface of the light source 100 can be known. and the relationship between the angle θ between the light irradiated onto the illumination surface 300 and the illumination surface 300.

[0088] At the same time, the above two equations also show the angle between the light in the lens 200 and the normal direction of the light emitting surface 220: and the surface shape of the light incident surface 210 of the lens 200 relationship.

[0089] It can be further assumed that the light intensity emitted by the light source 100 is , the normalized spectrum of the light emitted by the light source 100 is , then the spectral integral of a point on the illumination surface 300 is:

[0090] ...Formula 2;

[0091] in and denote the lower and upper limits of the integral, respectively, and , .

[0092] If the spectrum of each part on the illumination surface 300 is to be consistent, the normalized spectrum of the light emitted by the light source 100 is Should meet:

[0093] ...Formula 1;

[0094] This formula shows that if the spectral integral of any point on the lighting surface 300 is equal, the normalized spectrum of the light source 100 should satisfy the condition. It can be seen that the present application can derive the condition that the spectral distribution of each point on the light source 100 should satisfy if the color uniformity of the lighting system 10 is to be improved based on the normalized spectrum of the light source 100, and then can select or set a suitable light source 100 based on the condition to improve the color uniformity of the lighting system 10, which is beneficial to improving the display effect of the projection device.

[0095] The present application can compensate for the problem of differences in color coordinates of light irradiated on the lighting surface 300 due to differences in the positions of the light emitting points and the light emitting angles, as well as different optical paths of the light emitting in the lens 200, by setting the spectral distribution on the light source 100, so that the light emitted by the light source 100 can have the same spectral integral and present the same color coordinates when irradiated on the lighting surface 300 through the lens 200, without the occurrence of color unevenness.

[0096] In some embodiments, the light source 100 includes a light emitting chip, and the spectrum at different positions on the light source 100 can be adjusted by selecting a suitable type of light emitting chip and designing the structure of the light emitting chip so that the normalized spectrum of the light emitted by the light source 100 meets the above conditions, so that the spectrum of the light incident on each position of the lighting surface 300 can be consistent. In some embodiments, the light source 100 is configured as a light emitting diode (LED).

[0097] In some embodiments, the light emitting chip is configured so that the light intensity of the light it emits is adjustable, so that the intensity of the light emitted by the light source 100 can be adjusted according to actual usage conditions, so as to improve the spectral uniformity of the light irradiated to each point on the lighting surface 300, thereby improving the color uniformity of the lighting system 10 and improving the display effect of the projection device.

[0098] In some embodiments, the light source 100 includes a plurality of light-emitting regions, and the light-emitting regions include a plurality of light-emitting chips arranged in an array, and the light-emitting chips of different light-emitting regions can be adjusted independently. The light intensities of different light-emitting regions can be adjusted to be different, so as to achieve the consistency of the spectrum of the light incident on the illumination surface 300 at various locations. In some embodiments, different light-emitting regions can be arranged in a ring-shaped manner with different diameters and arranged in sequence along the radial direction of the light source 100, so as to be able to adjust the light intensity of the light emitted by each light-emitting region to be different, the normalized spectrum of the light emitted by each point on the light source 100 is different, and the spectrum of the light emitted by the light source 100 when incident on various locations on the illumination surface 300 is consistent, so as to compensate for the differences in the color coordinates of the light irradiated on the illumination surface 300 caused by the different positions of the light-emitting points and the light-emitting angles, and the different optical paths of the light in the lens 200, so as to improve the color uniformity of the illumination system 10, which is conducive to improving the display effect of the projection device.

[0099] In some embodiments, the side of the light source 100 facing the lens 200 is coated with fluorescent powder, and the light emitted by the appropriate light source 100 can be obtained by the coating design of the fluorescent powder to meet the conditions that the spectral distribution of each point on the light source 100 should meet, and further improve the color uniformity of the lighting system 10. In some embodiments, by setting the thickness or surface shape of the fluorescent powder at different positions on the light source 100 to be different, the spectral distribution of each point on the light source 100 satisfies Formula 1 and Formula 2, so that the spectral integral of the light irradiated to any point on the lighting surface 300 is consistent, and the spectral integral of the light irradiated to any point on the lighting surface 300 can also be made consistent by setting the thickness and surface shape of the fluorescent powder at different positions on the light source 100 to be different, so as to improve the color uniformity of the lighting system 10 and improve the display effect of the projection device.

[0100] In some embodiments, the color uniformity of the lighting system 10 can also be improved by adjusting the surface shape of the lens 200. According to the above analysis, it is known that the angle between the light in the lens 200 and the normal direction of the light emitting surface 220 is The surface type g(x) of the light emitting surface 220 of the lens 200 and the surface type g(x) of the light incident surface 210 of the lens 200 are respectively Then, the angle between the light in the lens 200 and the normal direction of the light emitting surface 220 is The relationship between the angle θ between the light irradiated on the illumination surface 300 and the illumination surface 300 can be used to know the surface shape of the light incident surface 210 of the lens 200. And the relationship between the angle θ between the light irradiated onto the illumination surface 300 and the illumination surface 300, and the relationship between the surface type g(x) of the light emitting surface 220 of the lens 200 and the angle θ between the light irradiated onto the illumination surface 300 and the illumination surface 300 can be known.

[0101] It can be seen that the surface shape of the light incident surface 210 of the lens 200 is adjusted And the surface shape g(x) of the light-emitting surface 220 of the lens 200 satisfies:

[0102] ;and

[0103] hour;

[0104] Correspondingly, after the light emitted by the light source 100 passes through the lens 200 that meets the above conditions and is irradiated onto the illumination surface 300 , the spectral integral of the light at various locations on the illumination surface 300 remains consistent, so that the illumination system 10 has better color uniformity.

[0105] In some embodiments, the light incident surface 210 of the lens 200 is a convex surface, the light emitting surface 220 is a convex surface, and the lens 200 includes a lens with positive optical power, so that the lens 200 plays a role in converging light, so as to be able to receive the light emitted by the light source 100 and spread the light and converge it onto the lighting surface 300.

[0106] In some embodiments, multiple lenses may be provided between the light source 100 and the illumination surface 300. For example, in FIG2 , a Fresnel lens 400 is provided between the lens 200 and the illumination surface 300, or it may be understood that the lens 200 may be replaced by a lens group. For the lens group form, the conditions that the spectral distribution of the light emitted by the light source 100 needs to satisfy are still as shown in the above analysis. By setting up the slope of each section of light and the surface equation of each surface of the lens, as well as the angle relationship between each section of light and the light incident surface 210 or the light exit surface 220 of the corresponding lens, the spectral distribution of the light emitted by the light source 100 and the relationship that needs to be satisfied are obtained when the light is irradiated onto the illumination surface 300 at an angle of θ: , corresponding to different numbers of lenses, the spectral distribution of the light emitted by the light source 100 is different, which will not be described here.

[0107] In some embodiments, the lighting system 10 also includes a liquid crystal layer, and the liquid crystal layer is arranged on a light-emitting surface 220 facing the lens 200. The side of the liquid crystal layer facing the lens 200 is a lighting surface 300. It can be understood that the light emitted by the light source 100 passes through the lens 200 and is irradiated onto the lighting surface 300 of the liquid crystal layer, and then is incident on the interior of the liquid crystal layer. The liquid crystal molecules are stimulated by electric current to generate points, lines, and surfaces to form a picture in coordination with the light emitted by the light source 100.

[0108] In summary, the lighting system 10 provided in the present application satisfies Formula 1, Formula 2, Formula 3 through the structural design of the light emitting chip and the phosphor of the light source. , and the formula , which can make the image formed on the lighting surface 300 after the light emitted by the light source 100 is transmitted through the lens 200 to the lighting surface 300 have uniform color, thereby achieving the effect of improving the color uniformity of the lighting system 10 and improving the display quality of the projection device.

[0109] In some embodiments, the lighting system further includes an optical functional device, the optical functional device includes a liquid crystal layer or a collimating lens, and a side of the liquid crystal layer or the collimating lens facing the lens is a lighting surface.

[0110] The present application also provides a projection device, including the above-mentioned lighting system 10, and the projection device also includes a display lens, which is arranged on the side of the lighting surface 300 away from the lens 200. In other words, the display lens is arranged on the side of the liquid crystal layer away from the lens 200 to form an image with the emitted light.

[0111] In some embodiments, the display lens may be a projection lens, including one or more lenses with optical power, for adjusting and projecting the light emitted by the illumination system 10 to improve the imaging quality of the light.

[0112] The lighting system 10 and the projection device of the present application obtain a spectral spatial distribution of the light source 100 that is related to parameters such as the diameter of the lens 200, the distance between the lens 200 and the lighting surface 300, the absorption coefficient of the medium of the lens 200, and the distance between the lens 200 and the light source 100. Based on the spectral spatial distribution, it is obtained that if the color uniformity of the lighting system 10 is to be improved, the spectral distribution of each point on the light source 100 should meet the conditions, and then a suitable light source 100 can be selected or set according to the conditions to improve the color uniformity of the lighting system 10 and improve the display effect of the projection device.

[0113] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0114] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A lighting system, characterized in that: The lighting system comprises: A light source for emitting light; A lens, disposed on the light-emitting side of the light source, the lens having a light-entering surface facing the light source and a light-emitting surface opposite to the light-entering surface; The lighting system comprises a lighting surface for receiving the light emitted by the lens, and the normalized spectrum of the light source is satisfy: ； ； ;as well as ； in, is the intensity of light emitted by the light source, is the angle of incidence of the light on the light source, λ is the wavelength of the light, D is the diameter of the lens, e is the distance between the axis of the lens and the illumination surface, α is the absorption coefficient of the medium of the lens, h is the distance between the incident position of the light on the illumination surface and the optical axis, x0 is the distance between the exit position of the light on the light exit surface and the light source in a direction parallel to the optical axis, y0 is the distance between the exit position of the light on the light exit surface and the light source in the first direction, x1 is the distance between the incident position of the light on the light entrance surface and the light source in a direction parallel to the optical axis, y1 is the distance between the incident position of the light on the light entrance surface and the light source in the first direction; the optical axis and the first direction are perpendicular to each other.

2. The lighting system according to claim 1, characterized in that The light incident surface of the lens is a convex surface, and the light emitting surface is a convex surface.

3. The lighting system according to claim 1, characterized in that The lens includes an optic having positive optical power.

4. The lighting system according to claim 1, characterized in that The light source includes a light emitting chip.

5. The lighting system according to claim 4, characterized in that: The light emitting chip is configured such that the light intensity of the light emitted by the chip is adjustable.

6. The lighting system according to claim 4, characterized in that The light source includes a plurality of light-emitting areas, each of which includes a plurality of light-emitting chips arranged in an array, and the light-emitting chips in different light-emitting areas can be adjusted independently.

7. The lighting system according to claim 1, characterized in that A side of the light source facing the lens is coated with fluorescent powder.

8. The lighting system according to claim 7, characterized in that The thickness and / or surface shape of the phosphor at different positions on the light source are different.

9. The lighting system according to claim 1, characterized in that: The lighting system further comprises an optical functional device, wherein the optical functional device comprises a liquid crystal layer or a collimating lens, and a side of the liquid crystal layer or the collimating lens facing the lens is the lighting surface.

10. A projection device, characterized in that: Comprising a lighting system as claimed in any one of claims 1 to 9.

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