Micro LED-based multispectral mobile phone flash lamp

Abstract

The invention discloses a multi-spectral mobile phone flash lamp based on Micro LEDs, which belongs to the field of optical devices of mobile communication equipment, and comprises a vertically stacked RGB Micro LED array, and the chip size is 5 * 5 mu m < 2 > to 10 * 10 mu m < 2 >; the NUV (near ultraviolet) Micro LED array is transversely distributed, and the wavelength range of the NUV Micro LED array is 370 to 410 nm; the period of the nano lens array is 1-3 microns, and the nano lens array is used for mixing spectrums and controlling the divergence angle of emergent light to be smaller than or equal to 15 degrees The time division multiplexing driving circuit supports independent current modulation of RGB and NUV channels; the RGB Micro LED adopts an InGaN / GaN multi-quantum well structure, and the NUV Micro LED adopts an AlGaN / GaN superlattice structure; the nano lens array is formed on the SiO2 layer through a nano imprinting technology; according to the invention, the technical bottleneck of a traditional flash lamp is solved by setting a multispectral Micro LED array, a dynamic driving circuit and an intelligent scene adaptation algorithm, the flash lamp can be widely applied to scenes such as AR / VR, portrait photography and low-light shooting, the flash lamp has the advantages of high performance and low power consumption, and the flash lamp adapts to the integration requirements of mobile terminals such as mobile phones.

Description

Technical Field

[0001] The present invention relates to the technical field of optical devices for mobile communication equipment, and in particular to a multi-spectral mobile phone flashlight based on Micro LED. Background Art

[0002] With the rapid development of mobile camera technology, the performance of mobile phone flashlights, a core auxiliary component for low-light imaging, directly impacts shooting results and user experience. Traditional mobile phone flashlights primarily rely on white LED light sources. While widely used in basic fill-light scenarios, their technical limitations are becoming increasingly apparent in response to emerging demands such as AR / VR interaction, high-precision portrait photography, biospectral detection, and multimodal imaging in low-light environments.

[0003] 1. Defects of existing technology

[0004] 1) Monotonous color temperature: Traditional mobile phone flashes mostly use white light LEDs (color temperature 5500K ± 200K), which are prone to overexposure or color distortion (such as poor skin tone reproduction in portraits) in low-light environments.

[0005] 2) Energy consumption issue: The peak power of white light LED can reach 2W, which leads to a significant decrease in the battery life of mobile phones.

[0006] 3) Functional limitations: Unable to support emerging needs such as multispectral imaging (such as infrared fill light and UV anti-counterfeiting detection).

[0007] 2. Micro LED Technology Progress

[0008] 1) Size and efficiency: The current Micro LED chip size has been reduced to 3-5μm, with an internal quantum efficiency exceeding 80%.

[0009] 2) Integration challenges: Mass transfer yield (<90%) and thermal management remain bottlenecks for mass production.

[0010] 3) Multispectral applications: Huawei, Changhong and other companies have deployed RGB Micro LED display and light efficiency optimization technologies.

[0011] Therefore, in response to the above problems and the technical advantages of Micro LED, the present invention provides a mobile phone flash device that integrates a multi-spectral light source and an optical fiber bundle. Summary of the Invention

[0012] In response to the shortcomings of the existing technology, the present invention provides a multi-spectral mobile phone flash light based on Micro LED, which solves the problems raised in the above background technology.

[0013] Technical solution: To solve the above technical problems, according to one aspect of the present invention, more specifically a multi-spectral mobile phone flashlight based on Micro LED, comprising:

[0014] Multispectral Micro LED Array:

[0015] Vertically stacked visible light Micro LED, pixel size 10×10μm 2 ; NUV layer: laterally arranged AlGaN-based near-ultraviolet LEDs (385nm) for exciting fluorescent materials or biological detection; optical layer: nano-cylindrical lens array (period 2μm) for beam collimation and spectral mixing.

[0016] Drive circuit:

[0017] Time-division multiplexing controller: Dynamic switching of ultraviolet, visible light, and near-infrared channels is achieved through FPGA (cycle <1ms); adaptive dimming algorithm: Spectral weight is adjusted based on ambient light intensity and scene recognition (such as portraits, night scenes).

[0018] Working principle of Micro LED-based multi-spectral mobile phone flash:

[0019] 1) Single-shot mode: UV, visible light, and near-infrared Micro LEDs are simultaneously excited to generate high color rendering white light (CRI>95);

[0020] 2) Multi-spectral separation mode: Independently control multi-wavelength optical channels to support AR special effects rendering or spectral analysis (such as detecting anti-counterfeiting marks on bills).

[0021] Further innovations:

[0022] 1) Spectral tunability: 16 preset spectral modes are achieved through stacking structure and driving algorithm;

[0023] 2) Low power design: The NUV chip uses pulse drive (duty cycle <10%), reducing overall power consumption by 40% compared to traditional solutions;

[0024] 3) Compact packaging: Using silicon-based transfer technology, the array thickness is compressed to 0.3mm.

[0025] The beneficial effects of the Micro LED-based multi-spectral mobile phone flashlight of the present invention are:

[0026] (1) The present invention solves the technical bottleneck of traditional flash lamps by setting up a multi-spectral Micro LED array, a dynamic driving circuit and an intelligent scene adaptation algorithm. It can be widely used in scenes such as AR / VR, portrait photography, and low-light shooting. It has the advantages of high performance and low power consumption and is adapted to the integration requirements of mobile terminals such as mobile phones. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0028] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0029] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that, unless there is a conflict, the embodiments and features in the embodiments of the present application can be combined with each other.

[0030] In order to make the technical solution of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Reference Figure 1 , a multi-spectral mobile phone flashlight based on Micro LED, characterized by including:

[0032] Vertically stacked RGB Micro LED array with a chip size of 5×5μm 2 Up to 10×10μm 2 ;

[0033] Laterally distributed NUV (near-ultraviolet) Micro LED array with a wavelength range of 370-410nm;

[0034] Nanolens array with a period of 1-3 μm, used to mix spectra and control the divergence angle of the emitted light to ≤15°;

[0035] Time-division multiplexing drive circuit supports independent current modulation of RGB and NUV channels.

[0036] Preferably, the RGB Micro LED adopts an InGaN / GaN multi-quantum well structure, and the NUV Micro LED adopts an AlGaN / GaN superlattice structure.

[0037] Preferably, the nanolens array is formed on the SiO2 layer by nanoimprint technology.

[0038] Preferably, the driving circuit integrates an adaptive dimming algorithm to dynamically adjust the spectral weight according to the ambient light sensor data; the hardware architecture of the driving circuit is as follows:

[0039] Main control chip: integrated PWM controller and ADC module, supports 16-bit grayscale adjustment; power management: uses GaN FET to achieve high-frequency switching (frequency > 1MHz) to reduce EMI interference.

[0040] The driving circuit software algorithm is as follows:

[0041] Scene recognition module: Analyzes ambient light spectrum and target object characteristics based on the CNN model (deployed in the mobile phone's NPU);

[0042] Spectral optimization algorithm: Dynamically adjusts the RGB duty cycle, for example, enhancing green in portrait mode (reducing the red-eye effect).

[0043] Preferably, the manufacturing process is also as follows:

[0044] 1) Epitaxial growth:

[0045] n-type GaN, InGaN quantum well (RGB layer), and p-type GaN are grown sequentially on a sapphire substrate using MOCVD; a NUV AlGaN layer is formed by selective area etch (SACVD).

[0046] 2) Mass transfer:

[0047] Laser lift-off (LLO) and electrostatic adsorption technology are used to transfer the Micro LED array to the CMOS driver substrate; the mass transfer accuracy is ±1μm and the yield is >95%.

[0048] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A multi-spectral mobile phone flashlight based on Micro LED, characterized by: include: Vertically stacked RGB Micro LED array with a chip size of 5×5μm 2 Up to 10×10μm 2 ; Laterally distributed NUV Micro LED array with a wavelength range of 370-410nm; Nanolens array with a period of 1-3 μm, used to mix spectra and control the divergence angle of the emitted light to ≤15°; Time-division multiplexing drive circuit supports independent current modulation of RGB and NUV channels.

2. The multi-spectral mobile phone flashlight based on Micro LED according to claim 1, characterized in that: The RGB Micro LED adopts InGaN / GaN multi-quantum well structure, and the NUV Micro LED adopts AlGaN / GaN superlattice structure.

3. The multi-spectral mobile phone flashlight based on Micro LED according to claim 1, characterized in that: The nano lens array is formed on the SiO2 layer by nanoimprint technology.

4. The multi-spectral mobile phone flashlight based on Micro LED according to claim 1, characterized in that: The driving circuit integrates an adaptive dimming algorithm to dynamically adjust the spectral weight according to the ambient light sensor data.

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