Backlight Module Superlens and Wire Grate Light Homogenization
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Solution Overview
Problem
Current backlight modules for display devices face challenges in achieving efficient light homogenization and brightness enhancement due to limitations in light mixing distance and structural complexity, particularly with the use of Mini Light-Emitting Diodes (Mini LEDs).
Innovation Solution
A backlight module design featuring a first substrate with a mini light-emitting diode chip array, a superlens array, and a second substrate with a wire grate array and prism structure, where the superlenses are positioned on the light-emitting side of the Mini LEDs to reduce light mixing distance and eliminate the need for separate optical films, enhancing light homogenization and structural simplicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If traditional optical films are used for light homogenization, then light mixing distance is extended, but module thickness and structural complexity increase
Solution Approach 1:
The patent replaces traditional optical films with a wire grate array that uses diffraction physics to achieve light homogenization. The wire grates diffract light from Mini LEDs to fill dark regions between adjacent LEDs, eliminating the need for thick optical mixing layers and achieving uniform illumination with reduced module thickness.
Solution Approach 2:
The patent changes the optical parameters by using sub-wavelength wire grates with specific spacing and dimensions. The wire grate period and wire diameter are carefully designed to control diffraction angles and light distribution, enabling effective light homogenization at shorter distances without requiring traditional optical films.
2Illumination intensity
If multiple separate optical films are used for light control, then optical performance is improved, but manufacturing complexity and assembly steps increase
Solution Approach 1:
The patent merges the functions of multiple separate optical films into a single integrated wire grate array structure. The wire grates perform multiple optical functions simultaneously - light diffraction, homogenization, and direction control - eliminating the need for separate optical films and simplifying the overall module structure.
Solution Approach 2:
The wire grate array serves multiple optical functions within a single component: it diffracts light to fill dark regions, homogenizes illumination across the display area, and controls light direction. This multi-functionality reduces the number of separate optical components needed and simplifies manufacturing.
3Use of energy by moving object
If Mini LEDs are used with traditional optical films, then light efficiency is reduced due to longer light mixing distance, but without optical films light uniformity is insufficient
Solution Approach 1:
The patent replaces optical film-based light mixing with a diffraction-based wire grate system that achieves light uniformity without requiring long mixing distances. This substitution preserves light efficiency by minimizing the distance light must travel while still achieving uniform illumination through controlled diffraction.
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 proposed design achieves improved light homogenization and brightness enhancement, reducing light mixing distance and simplifying the module's structure, resulting in increased lightness and thinness while enhancing light efficiency and uniformity.
Implementation Method 1
a superlens array arranged on a surface of the encapsulation layer away from the first base, and the superlens array includes a plurality of superlenses
Implementation Method 2
a wire grate array arranged on the first surface, and the wire grate array includes a plurality of wire grates
Implementation Method 3
a prism structure arranged on the second surface, wherein the prism structure includes a plurality of prism groups
Data Source
AI summary
A backlight module, including: a first base, a mini light-emitting diode chip array, an encapsulation layer covering the mini light-emitting diode chip array and a superlens array sequentially arranged on a first substrate; and a second base, a wire grate array and a prism structure sequentially arranged on a second substrate. The superlens array, the wire grate array and the prism structure include a plurality of superlenses, a plurality of wire grates and a plurality of prism groups, respectively. The second base is a glass base, orthographic projections of the plurality of wire grates on the first base at least partially overlap with the orthographic projections of the plurality of superlenses on the first base, respectively, and orthographic projections of the plurality of prism groups on the first base are located between the orthographic projections of two adjacent wire grates on the first base, respectively.