Multispectral mobile phone flash lamp based on optical waveguide

Abstract

The invention discloses a multispectral mobile phone flash lamp based on an optical waveguide, and belongs to the technical field of optical devices. The surface of the SiC substrate is provided with a step-shaped reflecting wall; a plurality of LED chips with different wavelengths or different color temperatures and a SiC optical waveguide sheet are combined to form multi-wavelength light through a total reflection principle; the fluorescent powder coating is arranged at the waveguide emergent end and is used for adjusting the color temperature; a plurality of LED light sources with different wavelengths are integrated through an optical waveguide beam combining technology, and accurate mixing of cold and warm color temperatures and lighting effect improvement are realized by combining a quantum well structure layer and a high-refractive-index SiC optical waveguide material. The core structure comprises a SiC substrate, a multispectral LED array, a quantum well light conversion layer, an optical waveguide beam combination module and a fluorescent powder coating. Compared with a traditional single-color-temperature flash lamp, the single-color-temperature flash lamp can cover the color temperature range of 2700K-5000K, the lighting effect is improved by more than 40%, and the structure is compact. The design solves the technical bottleneck that a traditional LED flash lamp is single in color temperature, high in energy consumption and incapable of meeting multi-scene requirements, and can be integrated in a mobile phone.

Description

Technical Field

[0001] The present invention relates to the field of optical design of mobile phone flashlights, in particular to a multi-spectral mobile phone flashlight based on an optical waveguide. Background Art

[0002] As a key fill-light component in camera modules, the performance of mobile phone flashes directly impacts image quality. Traditional LED flashes achieve fill-lighting through a single color temperature light source or simple multi-LED blending. However, as smartphone imaging technology evolves towards high dynamic range (HDR) and multi-scene adaptability (e.g., night scenes, portraits, and macro shots), higher requirements are being placed on the flash's spectral adjustability, light efficiency, and compactness.

[0003] The existing technology has the following defects:

[0004] Limitations of single color temperature: Traditional mobile phone flashes use single color temperature LEDs (such as 5000K cold white light), which can easily lead to problems such as skin color distortion and highlight overflow in low-light environments.

[0005] Defects of multi-LED light mixing: The existing dual-color temperature solution requires the integration of two independent LEDs and complex optical lenses, resulting in structural redundancy, large volume, poor consistency of materials from different batches, and unstable light mixing effects.

[0006] Insufficient light efficiency: The light efficiency of conventional LED flash is less than 80lm / W, which cannot meet the high brightness requirements of 4K video shooting.

[0007] What is currently lacking is a multi-spectral mobile phone flash based on optical waveguide, which can solve the above-mentioned problems by compressing the optical path volume and improving the heat dissipation efficiency by leveraging the high refractive index (2.6-2.7) and low thermal resistance characteristics of SiC optical waveguide. Summary of the Invention

[0008] In view of the deficiencies of the prior art, the present invention provides a multi-spectral mobile phone flashlight based on an optical waveguide, which solves the problems raised in the above background technology.

[0009] 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 an optical waveguide, comprising:

[0010] Substrate layer: SiC ceramic substrate (thermal conductivity ≥ 490W / m·K) is used, and the surface is etched with stepped reflective walls to reduce light energy loss.

[0011] LED array: Integrates 16 LEDs of different wavelengths and is packaged in the center of the substrate using a flip-chip process.

[0012] Quantum well light conversion layer: A multi-layer quantum well structure (bandgap width Eg1-Eg4) is coated on top of the LED to convert multi-wavelength light beams into multi-spectral white light.

[0013] Optical waveguide combining module: It is composed of SiC optical waveguide sheets, which combine multiple light paths into a single optical axis through the principle of total reflection. The waveguide surface is coated to control the output angle.

[0014] Phosphor coating: The waveguide emitter is covered with cold and warm dual-color phosphors (SrAlSiN:Eu 2+ / CaAlSiN:Eu 2+ ), and further adjust the color temperature to 2700K-5000K continuously adjustable.

[0015] The beneficial effects of the multi-spectral mobile phone flashlight based on optical waveguide of the present invention are:

[0016] (1) Improved luminous efficiency: After beam combining, the luminous efficiency reaches 130-205 lm / W, which is 40%-60% higher than the traditional solution.

[0017] Volume compression: The thickness of the optical waveguide module is ≤0.3mm, and the size of the overall flash module is reduced to Φ8×2mm.

[0018] Color temperature uniformity: Color temperature deviation ≤ ±50K, meeting professional technical requirements. Multiple preset spectral modes are achieved through optical waveguides.

[0019] The present invention can cover a color temperature range of 2700K-5000K, improve light efficiency by more than 40%, and has a compact structure. It overcomes the technical bottlenecks of traditional LED flashlights, such as single color temperature, high energy consumption, and inability to meet the needs of multiple scenarios, and can be integrated into mobile phones. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0021] Figure 1 It is a structural schematic diagram of the present invention. DETAILED DESCRIPTION

[0022] 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.

[0023] 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.

[0024] Reference Figure 1The multi-spectral mobile phone flashlight based on optical waveguide includes a SiC substrate, a phosphor coating, a plurality of LED chips with different wavelengths or different color temperatures, and a SiC optical waveguide sheet, wherein: the surface of the SiC substrate is provided with a stepped reflective wall;

[0025] The LED chip and SiC optical waveguide combine multi-wavelength light by the principle of total reflection;

[0026] The phosphor coating is arranged at the emitting end of the waveguide and is used to adjust the color temperature.

[0027] Preferably, the bandgap width gradient of the quantum well light conversion layer is 5-20 nm.

[0028] Preferably, the refractive index of the SiC optical waveguide plate is ≥2.6.

[0029] Preferably, the phosphor coating comprises SrAlSiN:Eu 2+ With CaAlSiN:Eu 2+ The mixing ratio is adjustable.

[0030] Working principle: Optical waveguide beam combining technology: Utilizing the high refractive index of SiC, multiple LED lights are combined into a single optical path, reducing the volume of optical components;

[0031] Quantum well color temperature control: By adjusting the thickness of the quantum well layer (5-20nm), the dynamic range of color temperature can be expanded;

[0032] Dual phosphor synergy: cold and warm phosphors are mixed in proportion to compensate for spectral attenuation during optical waveguide transmission;

[0033] Spectral tunability: 16 preset spectral modes are achieved through stacking structure and driving algorithm.

[0034] 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 an optical waveguide, comprising a SiC substrate, a phosphor coating, multiple LED chips of different wavelengths or color temperatures, and a SiC optical waveguide sheet, characterized by: The surface of the SiC substrate is provided with a stepped reflective wall; The LED chip and SiC optical waveguide combine multi-wavelength light by the principle of total reflection; The phosphor coating is arranged at the emitting end of the waveguide and is used to adjust the color temperature.

2. The multi-spectral mobile phone flashlight based on optical waveguide according to claim 1, characterized in that: The bandgap width gradient of the quantum well light conversion layer is 5-20 nm.

3. The multi-spectral mobile phone flashlight based on optical waveguide according to claim 1, characterized in that: The refractive index of the SiC optical waveguide plate is ≥2.

6.

4. The multi-spectral mobile phone flashlight based on optical waveguide according to claim 1, characterized in that: The phosphor coating comprises SrAlSiN:Eu 2+ With CaAlSiN:Eu 2+ The mixing ratio is adjustable.

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