An ultra-high uniformity surface light source

Abstract

The utility model discloses a kind of ultra-high uniformity surface light source, including shell, shell inside is equipped with PCB board, and PCB board is equipped with LED lamp pearl area, LED lamp pearl area is composed of inside LED lamp pearl area and the outside LED lamp pearl area of being equipped in inside LED lamp pearl area outside, inside LED lamp pearl area and outside LED lamp pearl area all include several linear arrangement LED lamp pearl, the arrangement density of several LED lamp pearls of outside LED lamp pearl area is greater than the arrangement density of several LED lamp pearls of inside LED lamp pearl area, PCB board top or top is equipped with PC nanometer microbead diffusion plate, PCB board bottom is equipped with upper heat dissipation plate, upper heat dissipation plate bottom is equipped with VC uniform temperature plate, VC uniform temperature plate bottom is equipped with lower heat dissipation plate;It is through PC nanometer microbead diffusion plate+LED lamp pearl area density gradient increasing optical supplementary structure design and through upper heat dissipation plate-VC uniform temperature plate-lower heat dissipation plate heat management structure design, to make optical structure and heat management structure collaborative optimization surface light source's light uniformity, to obtain ultra-high uniformity surface light source.

Description

Technical Field

[0001] This utility model relates to the technical field of surface light sources, and in particular to a surface light source with ultra-high uniformity. Background Technology

[0002] In the field of optical lighting and display, the uniformity of illumination of a surface light source is a core indicator for measuring its performance. Improving the uniformity of illumination of a surface light source not only enhances the visual experience but also improves the quality of detection in industrial, medical, and scientific research scenarios that require high-precision inspection.

[0003] Therefore, improving the uniformity of illumination from surface light sources is both necessary and a challenging task.

[0004] Currently, the uniformity of surface light sources is relatively low, which is due to the following defects:

[0005] 1. The spatial distribution of light from a surface light source is uneven, and its edge attenuation is more severe;

[0006] 2. The diffuser of the surface light source is uneven and is prone to failure under thermal expansion, resulting in the appearance of zebra stripes in the center;

[0007] 3. Poor thermal management of surface light sources can easily lead to large temperature increases, resulting in color temperature drift, brightness drift (bright spots appearing in the center), and deformation of the light guide plate (exacerbating the zebra stripes in the center). Utility Model Content

[0008] The purpose of this invention is to overcome the above-mentioned defects in the prior art and provide an ultra-high uniformity surface light source to solve the problems of uneven light spatial distribution, uneven diffusion of the diffuser plate, and poor thermal management, thereby effectively improving the light uniformity of the surface light source.

[0009] To achieve the above objectives, this utility model provides an ultra-high uniformity surface light source, including a housing. A PCB board is installed inside the housing. An LED bead area is installed on the PCB board. The LED bead area consists of an inner LED bead area and an outer LED bead area installed outside the inner LED bead area. Both the inner and outer LED bead areas include a plurality of linearly arranged LED beads. The arrangement density of the LED beads in the outer LED bead area is greater than that in the inner LED bead area. A PC nanosphere diffuser is installed on the top or above of the PCB board. An upper heat sink is installed at the bottom of the PCB board. A VC heat spreader is installed at the bottom of the upper heat sink. A lower heat sink is installed at the bottom of the VC heat spreader.

[0010] Preferably, the bottom of the lower heat sink is provided with a plurality of linearly arranged heat dissipation fins.

[0011] Preferably, a plurality of longitudinal flow channels and a plurality of transverse flow channels are respectively provided in the heat dissipation area formed by a plurality of linearly arranged heat dissipation fins, and the plurality of longitudinal flow channels and the plurality of transverse flow channels are arranged in a crisscross pattern.

[0012] Preferably, the PC nanosphere diffuser is mounted on the top of the housing, and the upper heat sink is mounted on the bottom of the housing.

[0013] Preferably, the PC nanosphere diffuser plate includes a polycarbonate (PC) matrix and a silica microsphere scatterer or a zirconium oxide nanosphere scatterer mixed on the polycarbonate (PC) matrix, wherein the contact surface between the polycarbonate (PC) matrix and the silica microsphere scatterer or the zirconium oxide nanosphere scatterer is modified with a silane coupling agent.

[0014] Preferably, the particle size range of the silica microsphere scatterer or the zirconium oxide nanosphere scatterer is 0.5-5 μm.

[0015] Preferably, the arrangement density of the LED beads in the outer LED bead area is twice that of the arrangement density of the LED beads in the inner LED bead area.

[0016] Preferably, the LED beads are tri-color LED beads, namely white light beads, IR850 infrared beads and IR940 infrared beads, and the color temperature range of the white light beads is 6500±400K.

[0017] Preferably, the VC heat spreader includes an evaporation end face at the bottom of the upper heat sink, a condensation end face at the top of the lower heat sink, a vacuum cavity between the evaporation end face and the condensation end face, a support column between the vacuum cavities, a capillary structure on the inner wall of the vacuum cavity, and a liquid working fluid inside the vacuum cavity.

[0018] Preferably, the housing includes four side panels arranged around it, and a power cord electrically connected to the PCB board is installed on the outside of the housing.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] 1. This utility model achieves the following:

[0021] A. Optical compensation structure:

[0022] Electronic compensation: By setting the LED bead area into an inner LED bead area and an outer LED bead area, the arrangement density of several LED beads in the outer LED bead area is greater than that in the inner LED bead area, thereby making the light spatial distribution of the surface light source uniform, and the brightness of its center and edge (even corners) uniform.

[0023] Physical compensation: By setting up a PC nanosphere diffuser plate, the uniformity of light diffusion emitted by the LED bead area is further improved;

[0024] By optimizing the light uniformity of the surface light source through the synergistic combination of electronic and physical compensation in the optical compensation structure, the defects of central zebra stripes and darker edges are effectively overcome.

[0025] B. Thermal management structure:

[0026] The heat dissipation structure of upper heat sink - VC heat dissipation plate - lower heat sink provides good thermal management, effectively and uniformly reduces temperature, resulting in a smaller temperature difference in the surface light source, thereby avoiding color temperature drift, brightness drift and deformation of the PC nanosphere diffuser.

[0027] C. By improving the light uniformity of the surface light source through an optical compensation structure and ensuring the brightness uniformity of the optical compensation structure through a thermal management structure, a light-thermal coupling design is achieved. The two work together to optimize the light uniformity of the surface light source, thereby enabling the surface light source to achieve ultra-high uniformity.

[0028] 2. In summary, the ultra-high uniformity surface light source provided by this utility model achieves ultra-high uniformity by using an optical supplementary structure design with a PC nanosphere diffuser plate and LED beads with a gradient increase in density, and a thermal management structure design with an upper heat sink, a VC heat spreader, and a lower heat sink. This allows the optical structure and thermal management structure to synergistically optimize the light uniformity of the surface light source, thereby obtaining an ultra-high uniformity surface light source. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of an ultra-high uniformity surface light source provided by an embodiment of this utility model;

[0031] Figure 2 This is an exploded structural diagram of an ultra-high uniformity surface light source provided by an embodiment of this utility model;

[0032] Figure 3 This is a top view of the LED bead area provided in an embodiment of this utility model;

[0033] Figure 4 This is a bottom view of the lower heat sink provided in an embodiment of this utility model;

[0034] Figure 5 This is an experimental diagram of a surface light source with ultra-high uniformity, provided by an embodiment of this utility model, to demonstrate the uniformity of the light source.

[0035] The diagram includes:

[0036] 1. Housing; 10. Power cord; 11. Side panel; 2. PCB board; 21. LED bead area; 211. Inner LED bead area; 212. Outer LED bead area; 215. LED bead; 3. PC nano-bead diffuser board; 4. Upper heat sink; 5. VC heat spreader; 6. Lower heat sink; 7. Heat dissipation fins; 8. Longitudinal flow channel; 9. Transverse flow channel. Detailed Implementation

[0037] The technical solution of this embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiment is one embodiment of the present invention, and not all embodiments thereof. Based on this embodiment of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Please see Figures 1 to 5 This utility model provides an ultra-high uniformity surface light source, including a housing 1, a PCB board 2 installed inside the housing 1, an LED bead area 21 installed on the PCB board 2, the LED bead area 21 consisting of an inner LED bead area 211 and an outer LED bead area 212 installed outside the inner LED bead area 211, both the inner LED bead area 211 and the outer LED bead area 212 include a plurality of linearly arranged LED beads 215, the arrangement density of the plurality of LED beads 215 in the outer LED bead area 212 is greater than the arrangement density of the plurality of LED beads 215 in the inner LED bead area 211, a PC nanosphere diffuser plate 3 is installed on the top or above of the PCB board 2, an upper heat sink 4 is installed on the bottom of the PCB board 2, a VC heat sink 5 is installed at the bottom of the upper heat sink 4, and a lower heat sink 6 is installed at the bottom of the VC heat sink 5.

[0039] The bottom of the lower heat sink 6 has several linearly arranged heat dissipation fins 7. Within the heat dissipation area formed by these linearly arranged fins 7, several longitudinal flow channels 8 and several transverse flow channels 9 are respectively formed, arranged in a crisscross pattern. The heat dissipation fluid (such as cooling air or cooling water) flows through the crisscrossed longitudinal and transverse flow channels 8 and 9, thereby maximizing the contact area for heat dissipation of the heat dissipation fins 7, achieving high-efficiency heat dissipation, and effectively improving the lifespan and thermal management stability of the surface light source.

[0040] PC nanosphere diffuser plate 3 is installed on the top of housing 1, and upper heat sink plate 4 is installed on the bottom of housing 1.

[0041] The PC nanosphere diffuser plate 3 comprises a polycarbonate (PC) matrix and silica microsphere scatterers or zirconium oxide nanosphere scatterers mixed on the PC matrix. The contact surface between the PC matrix and the silica microsphere scatterers or zirconium oxide nanosphere scatterers is modified with a silane coupling agent. The particle size range of the silica microsphere scatterers or zirconium oxide nanosphere scatterers is 0.5-5 μm. By adding micron-sized (0.5-5 μm) silica microsphere scatterers or zirconium oxide nanosphere scatterers, the multiple refractions of the light emitted from the LED light area can be effectively controlled, thereby achieving uniform volume scattering. Modifying the contact surface between the PC matrix and the silica microsphere scatterers or zirconium oxide nanosphere scatterers with a silane coupling agent effectively prevents particle agglomeration and improves the stability of the uniformly mixed silica microsphere scatterers or zirconium oxide nanosphere scatterers.

[0042] The arrangement density of several LED beads 215 in the outer LED bead area 212 is twice that of several LED beads 215 in the inner LED bead area 211.

[0043] The LED 215 is a tri-color LED 215, consisting of a white light LED, an IR850 infrared LED, and an IR940 infrared LED. The color temperature range of the white light LED is 6500±400K.

[0044] The VC vapor chamber 5 includes an evaporation end face located at the bottom of the upper heat sink 4, a condensation end face located at the top of the lower heat sink 6, an internal vacuum chamber installed between the evaporation end face and the condensation end face, support columns supporting the vacuum chamber, capillary structures on the inner wall of the vacuum chamber, and a liquid working fluid inside the vacuum chamber. The heat dissipation principle of the VC vapor chamber 5 is as follows: the liquid working fluid absorbs heat and vaporizes upon contact with the evaporation end face → the vaporized vapor diffuses to the low-temperature condensation end face due to the pressure difference → the vapor absorbs heat and condenses back → the liquid working fluid, driven by the capillary structure to condense and return, contacts the evaporation end face, thus achieving effective cooling and uniform temperature through this cycle.

[0045] The upper heat sink 4 is made of copper.

[0046] The housing 1 includes four side panels 11 arranged around it, and a power cable 10 electrically connected to the PCB board 2 is installed on the outside of the housing 1.

[0047] An embodiment of this utility model provides an ultra-high uniformity surface light source, the advantages of which are:

[0048] A. Optical compensation structure:

[0049] Electronic compensation: By setting the LED bead area 21 as an inner LED bead area 211 and an outer LED bead area 212, the arrangement density of several LED beads 215 in the outer LED bead area 212 is greater than the arrangement density of several LED beads 215 in the inner LED bead area 211, thereby making the light spatial distribution of the surface light source uniform, and the brightness of its center and edge (even corners) uniform.

[0050] Therefore, by using a special arrangement of LED beads in area 21 and a density gradient design of LED beads 215 in the edge area (LED beads 215 are tri-color LED beads 215 independently arranged in three bands of W / IR850 / IR940), and by supplementing the algorithm based on the Fresnel loss model, the luminous flux around the perimeter is increased by 30%±5%, effectively eliminating dark areas in the corners.

[0051] Physical compensation: By setting up the PC nanosphere diffuser plate 3, the diffusion uniformity of the light emitted by the LED bead area 21 is further improved.

[0052] The polycarbonate (PC) matrix incorporates 0.5-5μm silica microspheres or zirconia nanospheres (modified with silane coupling agents), effectively achieving uniform volume scattering (scattering angle > 170°) and eliminating the thermal deformation zebra-like patterns found in conventional diffusers.

[0053] By using an optical compensation structure to synergistically optimize the light uniformity of the surface light source through electronic and physical supplementation, the defects of central zebra stripes and darker edges can be effectively overcome.

[0054] B. Thermal management structure:

[0055] The heat dissipation structure of upper heat sink 4-VC heat dissipation plate 5-lower heat sink 6 ensures good thermal management, effectively reduces and evenly distributes the temperature, resulting in a smaller temperature difference in the surface light source. This avoids color temperature drift, brightness drift, and deformation of the PC nano-bead diffuser plate 3.

[0056] Among them, the VC heat spreader 5 has a thermal conductivity of >400W / mK, effectively achieving temperature control of ≤1.5℃. The lower heat sink 6, through the crisscrossing longitudinal flow channels 8 and transverse flow channels 9, effectively enhances heat dissipation by allowing the heat dissipation fluid to naturally convect.

[0057] C. By improving the light uniformity of the surface light source through an optical compensation structure and ensuring the brightness uniformity of the optical compensation structure through a thermal management structure, a light-thermal coupling design is achieved. The two work together to optimize the light uniformity of the surface light source, thereby enabling the surface light source to achieve ultra-high uniformity.

[0058] An embodiment of this utility model provides an ultra-high uniformity surface light source that achieves over 98% uniformity, far exceeding the 95% uniformity of traditional surface light sources. Experimental results are shown below. Figure 5 As shown:

[0059] Therefore, the ultra-high uniformity surface light source of this utility model has the following technical effects:

[0060] 1. The uniformity of the surface light source across the entire area reaches over 98%;

[0061] 2. The consistency of the 215 LED beads across the three color bands is ±2%;

[0062] 3. The surface light source achieves a working temperature difference of ±2 degrees Celsius;

[0063] 4. The white light color temperature stability is ±400K;

[0064] 5. Application in OLED screen defect detection:

[0065] Using 215 LED beads with an IR940 infrared wavelength that penetrates the OLED screen's thin film layer, and white light beads that produce light marks on the color rendering surface, the false judgment rate of this surface light source is reduced from 5.2% to 0.7%.

[0066] 6. In the testing of adhesive paths for mobile phone screen bonding:

[0067] Using IR850 infrared LED beads with 215 LED beads to penetrate the glass cover and image the internal bubbles;

[0068] Use white LED beads to develop surface scratches and dirt;

[0069] Synergistic effects: False detection rate decreased from 7.1% to 0.9%, and detection speed increased to 150fps. (Traditional surface light sources have a detection speed of less than 90fps.)

[0070] 7. Technical advantages of surface light source structure:

[0071] In terms of optical structure: It pioneered the dual mechanism of "electronic compensation (density gradient encryption design of LED beads 215) + physical compensation (nano-scattering homogenization of PC nano-bead diffuser plate 3)" to overcome the problem of dark areas in the corners of surface light sources;

[0072] In terms of thermal management: the heat dissipation structure of upper heat sink 4-VC heat dissipation plate 5-lower heat sink 6 achieves ±1.5 degrees Celsius temperature control (traditional surface light source has ±5 degrees Celsius temperature control).

[0073] Application level: The LED 215 uses tri-color LED 215 and adopts multi-band independent control technology to solve the problem of interference between visible light and infrared light.

[0074] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A surface light source with ultra-high uniformity, characterized in that, The device includes a housing (1), inside which a PCB board (2) is installed. The PCB board (2) has an LED bead area (21), which consists of an inner LED bead area (211) and an outer LED bead area (212) located outside the inner LED bead area (211). Both the inner LED bead area (211) and the outer LED bead area (212) include several linearly arranged LED beads (215). The arrangement density of several LED beads (215) in the outer LED bead area (212) is greater than that of several LED beads (215) in the inner LED bead area (211). A PC nano-bead diffuser plate (3) is installed on the top or above of the PCB board (2). An upper heat sink plate (4) is installed on the bottom of the PCB board (2). A VC heat sink plate (5) is installed at the bottom of the upper heat sink plate (4). A lower heat sink plate (6) is installed at the bottom of the VC heat sink plate (5).

2. The ultra-high uniformity surface light source according to claim 1, characterized in that, The bottom of the lower heat sink (6) is provided with several linearly arranged heat dissipation fins (7).

3. The ultra-high uniformity surface light source according to claim 2, characterized in that, Several longitudinal flow channels (8) and several transverse flow channels (9) are respectively opened in the heat dissipation area formed by several linearly arranged heat dissipation fins (7), and the several longitudinal flow channels (8) and several transverse flow channels (9) are arranged in a crisscross pattern.

4. The ultra-high uniformity surface light source according to claim 1, characterized in that, The PC nanosphere diffuser plate (3) is installed on the top of the housing (1), and the upper heat sink plate (4) is installed on the bottom of the housing (1).

5. A surface light source with ultra-high uniformity according to claim 1, characterized in that, The PC nanosphere diffuser plate (3) includes a polycarbonate (PC) matrix and a silica microsphere scatterer or a zirconium oxide nanosphere scatterer mixed on the polycarbonate (PC) matrix. The contact surface between the polycarbonate (PC) matrix and the silica microsphere scatterer or the zirconium oxide nanosphere scatterer is modified with a silane coupling agent.

6. A surface light source with ultra-high uniformity according to claim 5, characterized in that, The particle size range of the silica microsphere scatterer or the zirconium oxide nanosphere scatterer is 0.5-5 μm.

7. The ultra-high uniformity surface light source according to claim 1, characterized in that, The arrangement density of several LED beads (215) in the outer LED bead area (212) is twice that of several LED beads (215) in the inner LED bead area (211).

8. The ultra-high uniformity surface light source according to claim 1, characterized in that, The LED bead (215) is a tri-color LED bead (215), which is a white light bead, an IR850 infrared bead and an IR940 infrared bead, respectively. The color temperature range of the white light bead is 6500±400K.

9. A surface light source with ultra-high uniformity according to claim 1, characterized in that, The VC heat exchanger (5) includes an evaporation end face at the bottom of the upper heat exchanger (4), a condensation end face at the top of the lower heat exchanger (6), an internal vacuum cavity between the evaporation end face and the condensation end face, a support column between the vacuum cavities, a capillary structure on the inner wall of the vacuum cavity, and a liquid working fluid inside the vacuum cavity.

10. A surface light source with ultra-high uniformity according to claim 1, characterized in that, The housing (1) includes four side plates (11) arranged around it, and a power cord (10) electrically connected to the PCB board (2) is installed on the outside of the housing (1).

Images