Lamp Panel Optical Structure for Uniform Mini LED Backlighting
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Solution Overview
Problem
Mini LED technology faces challenges with non-uniform brightness across the lamp panel due to higher brightness in the middle area and lower brightness on both sides, leading to non-uniform display performance.
Innovation Solution
A lamp panel assembly with a light-transmissive member featuring a partially light-transmissive surface having inclined surfaces that reflect and transmit light differently, interspersed with scattering and fluorescent particles, and a reflector to enhance uniform brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional light-transmissive member with a flat surface is used, then the structure is simple and easy to manufacture, but the brightness distribution is non-uniform with higher brightness in the middle area and lower brightness on the sides
Solution Approach 1:
The light-transmissive member is designed with different surface properties in different regions: the first inclined surface has a light-reflecting structure to redirect light toward the sides, while the second inclined surface has a light-transmitting structure to maintain brightness in the middle area. This local differentiation of optical properties resolves the brightness uniformity issue without requiring complete structural redesign.
Solution Approach 2:
The light-transmissive member employs an asymmetric structure where the first inclined surface and second inclined surface have different inclination angles and optical functions. The first inclined surface is designed with a larger area and light-reflecting properties, while the second inclined surface has a smaller area and light-transmitting properties, creating an asymmetric light distribution pattern that achieves uniformity.
2Illumination intensity
If the first inclined surface and second inclined surface are designed with equal light transmission, then the structure is symmetric and simple, but the brightness uniformity cannot be achieved
Solution Approach 1:
The patent specifies different inclination angle ranges for the first and second inclined surfaces to optimize light distribution. The first inclined surface has an inclination angle of 10-45 degrees relative to the substrate, while the second inclined surface has an inclination angle of 30-60 degrees. These parameter variations enable different light transmission characteristics to achieve uniform brightness.
3Illumination intensity
If scattering particles and fluorescent particles are added to the light-transmissive member, then the light distribution is improved and brightness uniformity is enhanced, but the manufacturing process becomes more complex
Solution Approach 1:
The light-transmissive member is designed as a composite structure containing both scattering particles and fluorescent particles embedded within the light-transmissive material. The scattering particles (such as TiO2, SiO2, or ZrO2) with a size of 1-10 μm distribute light uniformly, while the fluorescent particles (such as YAG:Ce3+ or Lu3Al5O12:Ce3+) convert light wavelengths, together enhancing light distribution uniformity through material composition rather than complex structural design.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves uniform brightness across the lamp panel by reducing brightness in the middle area and increasing it on the sides, improving backlighting uniformity and display quality.
Implementation Method 1
a part of light emitted to the partially light-transmissive surface by the light-emitting element is reflected
Implementation Method 2
the other part is transmitted
Implementation Method 3
the light-transmissive member is interspersed with scattering particles
Implementation Method 4
the light-transmissive member is interspersed with fluorescent particles
Data Source
AI summary
A lamp panel assembly (10) and a display device (20). The lamp panel assembly (10) comprises: a substrate (100); one or more light-emitting elements (200) used for emitting light, the light-emitting elements (200) being disposed on the substrate (100); one or more light-transmissive members (300), the light-transmissive member (300) covering the light-emitting element (200), and the light-transmissive member (300) comprising a partially light-transmissive surface (301) located in front of the light-emitting element (200) and a completely light-transmissive surface (302) located on the side of the light-emitting element (200), wherein the partially light-transmissive surface (301) comprises a first inclined surface (311) and a second inclined surface (312) inclined relative to the light-emitting element (200), the inclination directions of the first inclined surface (311) and the second inclined surface (312) are different, a part of light emitted to the partially light-transmissive surface (301) by the light-emitting elements (200) is reflected, the other part is transmitted, and the reflected light is emitted through the completely light-transmissive surface (302). The light emission of the lamp panel assembly (10) may be more uniform.