Lighting fixture optical path structure and white light correction method

Abstract

The present invention discloses an optical path structure of a lighting fixture and a white light correction method. The optical path structure of the lighting fixture includes a light source, a front light plate, an anti-reflection film, and an image. The front light plate includes micro-structured light dots; light emitted by the light source is incident on a light incident surface of the front light plate; a first light emitting surface of the front light plate emits light emitted by the first light emitting surface of the front light plate; a second light emitting surface of the front light plate simultaneously emits light, and the light passes through the anti-reflection film; light reflected by the anti-reflection film is emitted from the light emitting surface where the micro-structured light dots of the front light plate are located; light is emitted from the light emitting surface where the micro-structured light dots of the front light plate are located, and the light emitted by the first light emitting surface of the front light plate and the light reflected by the anti-reflection film are mixed together to form lighting light of the lamp; light transmitted by the anti-reflection film is incident on the image and forms image reflected light; the optical path structure of the lighting fixture includes an illumination light path and an imaging light path. The present invention realizes clear illumination and image display at the same time, and uses green plant images to improve visual comfort.

Description

Technical Field

[0001] The present invention relates to the technical field of lighting fixtures, and in particular to an optical path structure of a lighting fixture and a white light correction method. Background Art

[0002] Nowadays, people have higher requirements for lighting quality, especially the requirements for lighting comfort. Existing lighting fixtures use mature backlighting technology, which consists of direct or side-lit backlight sources and light diffusion panels or transparent panels. The most common ones are lamps with light diffusion panels, while transparent panels are used for backlit advertising light boxes, as well as sky lights, light guide plate dot graphic lamps, etc. Among them, sky lights use the Rayleigh scattering principle to generate a sky blue background, which greatly improves the lighting comfort.

[0003] Humans have evolved over a long period of time to adapt their eyes to green plants. People feel most comfortable when looking at green plants, so green images are usually preferred to improve visual comfort for the human eye.

[0004] Backlighting technology was first applied to backlight display devices such as LCD screens. Now, with people's higher requirements for energy saving and health of electronic display devices, research on frontlighting technology has become a hot topic. Frontlighting technology is a component of frontlighting technology and has been applied to frontlighting devices. The application of frontlighting technology to lighting fixtures is a brand-new topic. There is no report on the development of frontlighting fixtures. There are many differences between frontlighting fixtures and frontlighting displays. First, the photometric requirements are different. Frontlighting fixtures are required to emit light to the outside, with a large luminous flux and high light efficiency, while frontlighting displays are required to emit light to the inside, with a small luminous flux and no light efficiency requirements. Secondly, the chromaticity requirements are different. The spectrum emitted by frontlighting fixtures conforms to the white light spectrum of the general lighting specifications, while frontlighting displays emit a display spectrum externally. Therefore, there are large specific technical differences between the frontlighting technologies used by frontlighting fixtures and frontlighting displays, and the composition of the two is even more different.

[0005] This patent adopts front light illumination technology. Summary of the invention

[0006] In view of the deficiencies in the prior art, an object of the present invention is to provide an optical path structure of a lighting fixture and a white light correction method, which can solve the problem of image display technology in the light-emitting area of ​​the lighting fixture.

[0007] The technical solution to achieve the purpose of the present invention is: a lighting fixture light path structure, including a light source, a front light plate, an anti-reflection film, and an image, wherein the front light plate includes micro-structured light dots;

[0008] The front light plate and the micro-structured light dots are both optically transparent structures, and do not produce colored light dots or spots, nor visible light distribution;

[0009] The light emitted by the light source is incident on the light incident surface of the front light plate;

[0010] The first light emitting surface of the front light plate emits light emitted by the first light emitting surface of the front light plate;

[0011] The second light emitting surface of the front light plate of the front light plate simultaneously emits light, and the light passes through the anti-reflection film to form anti-reflection film reflected light and anti-reflection film transmitted light;

[0012] The light reflected by the anti-reflection film passes through the front light plate and is emitted from the first light emitting surface of the front light plate;

[0013] The first light emitting surface of the front light plate emits light, and the light emitted by the first light emitting surface of the front light plate and the light reflected by the anti-reflection film are mixed together to form the lighting light of the lamp;

[0014] The light transmitted by the anti-reflection film is incident on the image and forms image reflected light;

[0015] The image reflected light is sequentially emitted through the anti-reflection film, the front light plate, and the micro-structured light dots to generate image light. The image light is formed through the micro-structured light dots, including the image light transmitted by the dots, the image light refracted by the dots, and the image light reflected by the dots. The image light refracted by the dots and the image light reflected by the dots change the image light so that the image light transmission direction at the micro-structured light dots is generated to produce a visual particle effect.

[0016] The optical path structure of the lighting fixture comprises an illumination optical path and an imaging optical path, wherein the illumination optical path comprises an optical transmission path of light emitted from the first light emitting surface of the front light plate and light reflected from the anti-reflection film: light emitted from the first light emitting surface of the front light plate is emitted from the micro-structured light dots of the front light plate and the first light emitting surface of the front light plate, and light reflected from the anti-reflection film is reflected by the anti-reflection film and then enters the front light plate, passes through the front light plate, and is emitted from the micro-structured light dots of the front light plate and the first light emitting surface of the front light plate;

[0017] The imaging optical path includes the optical transmission path of the image reflected light: the light transmitted from the anti-reflection film is incident on the image, and after being reflected by the image, it is incident on the anti-reflection film again, passes through the anti-reflection film and is incident on the front light plate, and finally is emitted from the micro-structured light dots of the front light plate and the first light emitting surface of the front light plate.

[0018] Furthermore, in order to avoid the visual granular effect caused by dots, according to the characteristics of the human eye with a limited resolution angle, the size of micro-structured light dots conforms to the following formula:

[0019] s c*d min / f

[0020] in:

[0021] s is the micro-structured light dot size,

[0022] c is the separation of visual cells in the macula of the human eye.

[0023] f is the focal length of the human eye.

[0024] d min The minimum distance between the human eye and the microstructured light dots without producing visual grain effects.

[0025] A white light correction method for a lighting fixture is applied to the light path structure of the lighting fixture, and the method comprises the following steps:

[0026] Step 1: Assign variable m=0, the light source is denoted as Sm, and the lighting fixture obtained by using the light source Sm is denoted as Dm;

[0027] Step 2: Select an LED light source S0 with known parameters. The light source S0 has a white light spectrum. The combined phosphor of the light source S0 includes n kinds of phosphors, where n≥1. The content of each phosphor is known. The content of the i-th phosphor in the combined phosphor is recorded as ;

[0028] Step 3: Use the light source S0 as the light source of the light path structure of the lighting fixture, but do not insert the image, so that the lighting fixture Dm is D0, and the emission spectrum of D0 includes the spectrum of the illumination light but does not include the spectrum of the imaging light. Test the relative spectrum amplitude of each phosphor at the corresponding peak wavelength. The relative spectrum amplitude of the i-th phosphor at the corresponding peak wavelength is recorded as ;

[0029] Step 4: Assign m=1, insert the lighting fixture D0 in step 2 into the image, obtain the lighting fixture Dm, which is D1, and measure the emission spectrum of the lighting fixture D1, including the spectrum of the illumination light and the spectrum of the imaging light;

[0030] Step 5: Measure the spectrum of the lighting fixture Dm obtained in the previous step. The peak wavelength corresponding to the i-th type of phosphor is recorded as ;

[0031] Step 6: Calculate the optimal content of various phosphors, the optimal content of the i-th phosphor at the m-th time Calculated as follows:

[0032]

[0033] In the formula, represents the content adjustment coefficient of the i-th phosphor, ;

[0034] Step 7: Each phosphor is made into a new light source Sm according to the optimized content of the previous step, and the light source As the light source of the light path structure of the lighting fixture, the lighting fixture is obtained ; If the If the color coordinate difference of the spectrum is within the preset range, the white light calibration of the lighting fixture is completed, otherwise the next step is executed;

[0035] Step 8: Assign variable m=m+1, that is, the value of variable m increases by 1, and loop through steps 5 to 7.

[0036] Beneficial effects of the present invention: The lighting fixture formed by the present invention can form lighting light with an image, and the image is displayed in the light-emitting area of ​​the lighting fixture, thereby achieving lighting and image display effects at the same time, and the displayed image is clear and has no graininess. And the human eye can directly look at the lighting fixture without experiencing a glaring visual physiological experience. In addition, the present invention can also make the lighting light finally emitted by the lighting fixture maintain the white light spectrum characteristics of general lighting, without the image color changing white light spectrum lighting. Thereby, the lighting fixture has better lighting quality and improves visual comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic diagram of the structure of the light path structure of a lighting fixture including a lighting light path;

[0038] Figure 2 A schematic diagram of the structure of the light path structure of the lighting fixture including the imaging light path;

[0039] Figure 3 A schematic diagram of transmission, refraction and reflection of light passing through a micro-structured light dot at the micro-structured light dot;

[0040] Figure 4 is a schematic diagram comparing the effects of the light path structure of the existing lighting fixture and the lighting fixture using the present invention when the light source does not emit light and relies on external light;

[0041] Figure 5 It is an image seen when the light source emits light, and is a schematic diagram comparing the effects of the light path structure of the existing lighting fixture and the lighting fixture using the present invention;

[0042] Figure 6 It is the image seen when the light source emits light, and a schematic diagram of the scene seen when a piece of white paper (white A4 paper) is placed on one side of the light path structure of the lighting fixture;

[0043] Figure 7 A schematic diagram of the color coordinates for calibrating the emission spectrum of the front lighting fixture;

[0044] Figure 8 is a schematic diagram of the color coordinates of the emission spectrum of the lighting fixture after correction;

[0045] In the figure, 1-front light plate, 11-microstructure light dots, 111-dot transmitted imaging light, 112-dot refracted imaging light, 113-dot reflected imaging light, 12-light emitted from the first light emitting surface of the front light plate, 13-light emitted from the second light emitting surface of the front light plate, 2-anti-reflection film, 21-light reflected from the anti-reflection film, 22-transmitted light from the anti-reflection film, 3-image, 31-image reflected light, 4-light source, 41-light emitted from the light source 41. DETAILED DESCRIPTION

[0046] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0047] like Figure 1-Figure 8 As shown, a light path structure of a lighting fixture includes a light source 4, a front light plate 1, an anti-reflection film 2, and an image 3. The front light plate 1 includes micro-structured light dots 11;

[0048] The front light plate 1 and the micro-structured light dots 11 are both optically transparent structures, and do not produce colored light dots or spots, nor visible light distribution;

[0049] The light emitted by the light source 4 is incident on the light incident surface of the front light plate 1;

[0050] The first light emitting surface of the front light panel 1 emits light 12 emitted from the first light emitting surface of the front light panel; the first light emitting surface of the front light panel is the light emitting surface where the micro-structured light dots 11 are located;

[0051] The second light emitting surface of the front light plate 1 emits light at the same time, and the light passes through the anti-reflection film 2 to form anti-reflection film reflected light 21 and anti-reflection film transmitted light 22; the second light emitting surface of the front light plate is another light emitting surface of the front light plate 1;

[0052] The reflected light 21 of the anti-reflection film passes through the front light plate 1 and is emitted from the light emitting surface where the micro-structured light dots 11 of the front light plate 1 are located;

[0053] The light emitting surface where the micro-structured light dots 11 of the front light plate 1 are located emits light, and the light 12 emitted from the first light emitting surface of the front light plate and the light reflected by the anti-reflection film 21 are mixed together to form the lighting light of the lamp;

[0054] The anti-reflection film transmitted light 22 is incident on the image 3 and forms image reflected light 31;

[0055] The image reflected light 31 is sequentially emitted through the anti-reflection film 2, the front light plate 1, and the micro-structured light dots 11 to generate image light. The image light passes through the micro-structured light dots 11 to form image light including dot-transmitted image light, dot-refracted image light, and dot-reflected image light. The dot-refracted image light and the dot-reflected image light change the image light so that the image light transmission direction at the micro-structured light dots 11 produces a visual particle effect.

[0056] The optical path structure of the lighting fixture includes an illumination optical path and an imaging optical path. The illumination optical path includes an optical transmission path of the light 12 emitted from the first light emitting surface of the front light plate and the light 21 reflected by the anti-reflection film: the light 12 emitted from the first light emitting surface of the front light plate is emitted from the micro-structured light dots 11 of the front light plate 1 and the light emitting surface where the light 21 is located, and the light 21 reflected by the anti-reflection film is reflected by the anti-reflection film 2 and then enters the front light plate 1, passes through the front light plate 1, and is emitted from the micro-structured light dots 11 of the front light plate 1 and the light emitting surface where the light 21 is located;

[0057] The imaging optical path includes the optical transmission path of the image reflected light 31: the anti-reflection film transmitted light 22 transmitted from the anti-reflection film 2 is incident on the image 3, and after being reflected by the image 3, it is again incident on the anti-reflection film 2, passes through the anti-reflection film 2 and is incident on the front light plate 1, and finally is emitted from the micro-structured light dots 11 of the front light plate 1 and the light emitting surface where they are located.

[0058] In order to avoid the microstructured light dots (11) from producing a visual granular effect, according to the characteristic of the human eye having a limit resolution angle, the size of the microstructured light dots 11 complies with the following formula:

[0059] s c*d min / f

[0060] in:

[0061] s is the size of the microstructure light dot 11, and the size of the microstructure light dot 11 can be the width or the diameter.

[0062] c is the separation of visual cells in the macula of the human eye.

[0063] f is the focal length of the human eye.

[0064] d min The minimum distance between the human eye and the micro-structured light dots 11 when no visual grain effect is produced.

[0065] For example, c is generally 3 μm (micrometer), f is generally 16.68 mm (millimeter), and d is generally 16.68 mm (millimeter). min The general value is 300 mm. Thus, s=3*300 / 16.68=53.96 μm. In practical applications, s can be 50 μm, so the process technology with a micro-structure light dot diameter of 50 um can be selected to manufacture the front light plate 1.

[0066] It should be noted that Figure 1 and Figure 2 The arrows in the figure indicate the direction of light transmission, including but not limited to being perpendicular to the front light plate 1, the anti-reflection film 2 and the image 3, and may also be incident into or out of the front light plate 1, the anti-reflection film 2 and the image 3 at a certain angle.

[0067] For example, Figure 1 and Figure 2As shown, the light emitted from the light source 4 enters the front light plate 1, and the light emitted by the light source 4 is recorded as the light source emitted light 41. A part of the light entering the front light plate 1 is emitted from the light emitting surface where the microstructure light dots 11 of the front light plate 1 are located, forming the light 12 emitted from the first light emitting surface of the front light plate. The first light emitting surface of the front light plate 1 also refers to the light emitting surface where the microstructure light dots 11 are located. The light 12 emitted from the first light emitting surface of the front light plate passes through the microstructure light dots 11 and the light emitting surface where the microstructure light dots 11 are located. Another part of the light is emitted from the other light emitting surface of the front light plate 1, forming the light 13 emitted from the second light emitting surface of the front light plate. The second light emitting surface of the front light plate 1 refers to another light emitting surface of the front light plate 1 that is away from the microstructure light dots 11. The light 13 emitted from the second light emitting surface of the front light plate is incident on the anti-reflection film 2. A portion of the light 13 emitted from the second light emitting surface of the front light plate that is incident on the anti-reflection film 2 is reflected by the anti-reflection film 2 and then emitted to form the anti-reflection film reflected light 21. The anti-reflection film reflected light 21 is again incident on the other light emitting surface of the front light plate 1 and emitted from the front light plate 1. The anti-reflection film reflected light 21 is finally emitted from the micro-structure light dots 11 and the light emitting surface where the micro-structure light dots 11 are located.

[0068] A portion of the light 13 emitted from the second light-emitting surface of the front light plate that is incident on the anti-reflection film 2 is transmitted through the anti-reflection film 2 and then emitted, forming the anti-reflection film transmitted light 22. The anti-reflection film 2 reflects the transmitted light and incident on the image 3, and then is reflected by the image 3 to form image reflected light 31. The image reflected light 31 is incident on the anti-reflection film 2 again, and after being transmitted through the anti-reflection film 2, it is incident on the front light plate 1 and emitted from the front light plate 1. The image reflected light 31 is finally emitted from the microstructure light dots 11 and the light-emitting surface where the microstructure light dots 11 are located.

[0069] For example, Figure 3 As shown, the light 12 emitted from the first light emitting surface of the front light plate, the light reflected from the anti-reflection film 21 and the image reflected light 31 will all pass through the microstructure light dots 11. The light passing through the microstructure light dots 11 will be transmitted, refracted and reflected at the microstructure light dots 11, forming dot transmission imaging light 111, dot refraction imaging light 112 and dot reflection imaging light 113 respectively.

[0070] refer to Figure 4-Figure 6 , Figure 4 This is a schematic diagram comparing the effects of the light path structure of the existing lighting fixture and the lighting fixture using the present invention when the light source 4 does not emit light and relies on external light. Figure 4 In the figure, the lighting fixture on the left is the lighting fixture light path structure of the present invention, and the lighting fixture on the right is based on the prior art. Figure 5 3 is the image 3 seen when the light source 4 emits light, and is a schematic diagram comparing the effects of the light path structure of the existing lighting fixture and the lighting fixture using the present invention. Figure 5In the figure, the image 3 on the left is a schematic diagram comparing the optical path structure of the lighting fixture of the present invention and the existing lighting fixture when the light source 4 emits light. In the image 3 on the left, the left side is the optical path structure of the lighting fixture of the present invention, and the right side is the existing lighting fixture. The image 3 on the right is a schematic diagram of the optical path structure of the lighting fixture of the present invention using another image 3 when the light source 4 emits light. Figure 6 This is a schematic diagram of the image 3 seen when the light source 4 emits light, and the scene seen when a piece of white paper (white A4 paper) is placed on one side of the light path structure of the lighting fixture. Figure 6 In the figure, the light displayed from the white paper is still white light, maintaining the white light spectrum characteristics of the lighting, and there will be no color change in the white light spectrum lighting of Image 3.

[0071] It can be clearly seen from these three pictures that the image 3 presented by the image 3 is very clear, and compared with the existing lighting fixtures, it plays a decorative and lighting effect with the image 3 as the background. In addition, the human eye can directly watch the image 3 without feeling glare, and the phenomenon of glare caused by the high brightness white light presented by the lighting device in the prior art will not occur. The present invention can also make the lighting light finally emitted by the lighting fixture optical path structure maintain the white light spectrum characteristics of general lighting, and the image 3 color will not change the white light spectrum lighting. Thereby, the lighting fixture optical path structure has better lighting quality and improves visual comfort.

[0072] The image 3 shown in these three pictures is the image 3 taken by a mobile phone. Due to the limitation of the mobile phone shooting function (the resolution of the mobile phone camera is far inferior to that of the human eye), the image 3 is less clear than what the human eye actually sees. The human eye can directly observe the image 3 from a very far distance. In addition, Figure 4 , Figure 5 and Figure 6 The comparison shows that Figure 6 Image 3 in FIG. 1 is colored (the branches and leaves are green), but the light displayed on the white paper on the side of the front light plate 1 is white.

[0073] In order to ensure that all the light emitted by the light path structure of the lighting fixture maintains the white light spectrum, even if the image 3 is colored, the light emitted by the light path structure of the lighting fixture still maintains the white light spectrum (such as Figure 6 As shown), the present invention also provides a white light correction method for a lighting fixture, which can be implemented based on the optical path structure of the lighting fixture, or based on other lighting devices, and the white light correction method includes the following steps:

[0074] Step 1: Assign variable m=0, the light source is denoted as Sm, and the lighting fixture obtained by using the light source Sm is denoted as Dm;

[0075] Step 2: Select an LED light source S0 with known parameters. The light source S0 has a white light spectrum. The combined phosphor of the light source S0 includes n kinds of phosphors, n≥1. The content of each phosphor is known. The initial content of the i-th phosphor in the combined phosphor is recorded as ;

[0076] Step 3: The reference light source S0 is used as the light source 4 of the light path structure of the lighting fixture, but the image 3 is not inserted, so as to obtain the lighting fixture D0. The emission spectrum of D0 includes the spectrum of the illumination light but does not include the spectrum of the imaging light. The relative spectrum amplitude of each phosphor at the corresponding peak wavelength is tested. The relative spectrum amplitude of the i-th phosphor at the corresponding peak wavelength is recorded as ;

[0077] Step 4: Assign m=1, insert the lighting fixture D0 in step 2 into image 3 to obtain lighting fixture D1, and measure the emission spectrum of lighting fixture D1, including the spectrum of the illumination light and the spectrum of the imaging light;

[0078] Step 5: Measure the spectrum of the lighting fixture D1 in the previous step. The peak wavelength corresponding to the i-th type of phosphor is recorded as ;

[0079] Step 6: Calculate the optimal content of various phosphors, the optimal content of the i-th phosphor at the m-th time Calculated as follows:

[0080]

[0081] In the formula, represents the content adjustment coefficient of the i-th phosphor, ;

[0082] Step 7: Each phosphor is made into a new light source Sm according to the optimized content of the previous step, and the light source As the light source 4 of the light path structure of the lighting fixture, the lighting fixture is obtained ; If the If the color coordinate difference of the spectrum is within the preset range, the white light calibration of the lighting fixture is completed, otherwise the next step is executed;

[0083] Step 8: Assign variable m=m+1, that is, the value of variable m increases by 1, and loop through steps 5 to 7.

[0084] Exemplary, reference Figure 7 and Figure 8 , when the color coordinate difference is within the preset range, it can be determined that the color coordinate is corrected from outside the blackbody locus to above the blackbody locus.

[0085] Exemplarily, the combined phosphor includes three kinds of phosphors, that is, n=3, and the three kinds of phosphors are green phosphor, yellow phosphor and red phosphor.

[0086] The embodiment disclosed in this specification is only an example of a unilateral feature of the present invention, and the protection scope of the present invention is not limited to this embodiment, and any other functionally equivalent embodiments fall within the protection scope of the present invention. For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all of these changes and deformations should fall within the protection scope of the claims of the present invention.

Claims

1. A lighting fixture light path structure, characterized in that: It comprises a light source (4), a front light plate (1), an anti-reflection film (2), and an image (3), wherein the front light plate (1) comprises micro-structured light dots (11); The front light plate (1) and the micro-structured light dots (11) are both optically transparent structures, and do not generate colored light dots or spots, nor do they generate visible light distribution; The light emitted by the light source (4) is incident on the light incident surface of the front light plate (1); The front light panel first light emitting surface of the front light panel (1) emits front light panel first light emitting surface emitted light (12); The second light emitting surface of the front light plate (1) emits light at the same time, and the light passes through the anti-reflection film (2) to form anti-reflection film reflected light (21) and anti-reflection film transmitted light (22); The reflected light (21) from the anti-reflection film passes through the front light plate (1) and is emitted from the first light emitting surface of the front light plate (1); The first light emitting surface of the front light plate (1) emits light, and the light (12) emitted by the first light emitting surface of the front light plate and the light (21) reflected by the anti-reflection film are mixed together to form the lighting light of the lamp; The anti-reflection film transmitted light (22) is incident on the image (3) and forms image reflected light (31); The image reflected light (31) is sequentially emitted through the anti-reflection film (2), the front light plate (1), and the micro-structured light dots (11) to generate image light. The image light passes through the micro-structured light dots to form image light transmitted by the dots, image light refracted by the dots, and image light reflected by the dots. The image light refracted by the dots and image light reflected by the dots change the image light so that the transmission direction of the image light at the micro-structured light dots (11) is generated to produce a visual particle effect. The optical path structure of the lighting fixture comprises an illumination optical path and an imaging optical path, wherein the illumination optical path comprises an optical transmission path of light (12) emitted from the first light emitting surface of the front light plate and light (21) reflected from the anti-reflection film: the light (12) emitted from the first light emitting surface of the front light plate is emitted from the micro-structured light dots (11) of the front light plate (1) and the first light emitting surface of the front light plate, and the light (21) reflected from the anti-reflection film (2) enters the front light plate (1) after being reflected by the anti-reflection film (2), passes through the front light plate (1) and is emitted from the micro-structured light dots (11) of the front light plate (1) and the first light emitting surface of the front light plate; The imaging optical path comprises an optical transmission path of the image reflected light (31): the anti-reflection film transmitted light (22) transmitted from the anti-reflection film (2) is incident on the image (3), and after being reflected by the image (3), is incident on the anti-reflection film (2) again, passes through the anti-reflection film (2) and is incident on the front light plate (1), and finally is emitted from the micro-structured light dots (11) of the front light plate (1) and the first light emitting surface of the front light plate.

2. The light path structure of the lighting fixture according to claim 1, characterized in that: In order to avoid the microstructured light dots (11) from producing a visual granular effect, according to the characteristic of the human eye having a limit resolution angle, the size of the microstructured light dots (11) complies with the following formula: s≤c*d min / f in: s is the size of the microstructured light dot (11), c is the separation of visual cells in the macula of the human eye. f is the focal length of the human eye. d min The minimum distance between the human eye and the microstructured light dots (11) when no visual grain effect is produced.

3. A method for calibrating white light of a lighting fixture, applied to the light path structure of the lighting fixture as claimed in any one of claims 1 to 2, the method comprising the following steps: Step 1: Assign variable m=0, the light source is denoted as Sm, and the lighting fixture obtained by using the light source Sm is denoted as Dm; Step 2: Select an LED light source S0 with known parameters. The light source S0 has a white light spectrum. The combined phosphor of the light source S0 includes n kinds of phosphors, where n≥1. The content of each phosphor is known. The content of the i-th phosphor in the combined phosphor is recorded as wp i,0 ; Step 3: Use the light source S0 as the light source (4) of the light path structure of the lighting fixture, but do not insert the image (3), so that the lighting fixture Dm is obtained as D0, and the emission spectrum of D0 includes the spectrum of the illumination light but does not include the spectrum of the imaging light. Test the relative spectrum amplitude of each phosphor at the corresponding peak wavelength. The relative spectrum amplitude of the i-th phosphor at the corresponding peak wavelength is recorded as Ep i,0 ; Step 4: Assign m=1, insert the lighting fixture D0 in step 2 into image (3), obtain the lighting fixture Dm as D1, and measure the emission spectrum of the lighting fixture D1, including the spectrum of the illumination light and the spectrum of the imaging light; Step 5: Measure the spectrum of the lighting fixture Dm obtained in the previous step. The relative spectrum amplitude at the peak wavelength corresponding to the i-th type of phosphor is recorded as Ep. i,m ; Step 6: Calculate the optimal content of various phosphors. The optimal content wp of the i-th phosphor at the m-th time i,m Calculated as follows: wp i,m =wp i,m-1 *(1+k i *(Ep i,m -p i,m-1 ) / i,m ) In the formula, k i represents the content adjustment coefficient of the i-th phosphor, 0< i ≤1; wp i,m-1 represents the optimized content of the i-th phosphor at the m-1th time, Ep i,m-1 Indicates the relative spectral amplitude at the peak wavelength corresponding to the i-th type of phosphor in the previous lighting fixture Dm-1 of the lighting fixture Dm; Step 7: each phosphor is made into a new light source Sm according to the optimized content in the previous step, and the light source Sm is used as the light source (4) of the light path structure of the lighting fixture, thereby obtaining the lighting fixture Dm; if the color coordinate difference of the spectrum of the lighting fixture Dm is within a preset range, the white light calibration of the lighting fixture is completed, otherwise, the next step is executed; Step 8: Assign variable m=m+1, that is, add 1 to the value of variable m, and execute steps 5 to 7 in a loop.

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