Cambered and Prismatic Microstructures for LCD Backlight Uniformity
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Solution Overview
Problem
Conventional backlight modules for LCDs face challenges in achieving uniform light illumination, leading to partial bright spots or dark areas, which reduces luminous efficiency and increases power consumption due to the limitations of existing diffuser plates and diffusion sheets.
Innovation Solution
A diffuser plate with alternating light-scattering and light-gathering areas, featuring cambered units and prism lenses, respectively, is used to refract light uniformly, addressing the issue of non-uniform illumination by optimizing the refraction index based on the incidence angle of light sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple diffusion sheets with microstructures are used to improve light diffusion uniformity, then illumination uniformity is improved, but luminous efficiency decreases and power consumption increases
Solution Approach 1:
The diffusion function is segmented into two distinct types of microstructures: light-scattering areas with cambered units for diffuse scattering, and light-gathering areas with prism lenses for directional refraction. This segmentation allows each area to perform its specific function optimally without the energy losses associated with uniform microstructures across the entire surface.
Solution Approach 2:
Different regions of the diffuser plate are assigned different microstructure types based on their functional requirements. Light-scattering areas use cambered units to scatter light uniformly, while light-gathering areas use prism lenses to redirect light efficiently. This local differentiation optimizes both diffusion uniformity and luminous efficiency by matching structure to function in each region.
2Illumination intensity
If multiple diffusion sheets with microstructures are used to enhance light diffusion, then illumination uniformity is improved, but device complexity increases
Solution Approach 1:
The patent merges the light-scattering function and light-gathering function into a single diffuser plate by incorporating both cambered units and prism lenses in alternating areas. This consolidation eliminates the need for multiple separate diffusion sheets, reducing overall device complexity while maintaining the benefits of both scattering and directional refraction.
Solution Approach 2:
The diffuser plate serves multiple functions simultaneously: it scatters light in light-scattering areas, gathers and redirects light in light-gathering areas, and collectively achieves uniform illumination across the display panel. This multi-functionality in a single component reduces the number of separate elements needed in the optical system.
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 enhances light diffusion uniformity, reducing brightness loss and power consumption by effectively distributing light across the LCD panel, improving the overall performance of the backlight module.
Implementation Method 1
Each microstructure has the ability to alter the direction of the light traveling through it; therefore, light will scatter after traveling through the microstructures on the bottom diffusion sheet 35
Data Source
AI summary
A backlight module includes a light source module and a diffuser plate. The diffuser plate has a plate body, a plurality of light-scattering areas and a plurality of light-gathering areas. The light-scattering areas and the light-gathering areas are alternately disposed on a light-entrance surface or a light-exit surface of the plate body. The light-scattering area includes a plurality of cambered units while each cambered unit has a convex cambered surface. The light-gathering area includes a plurality of prism lenses. Two side surfaces of the prism lenses intersect at an angle θ.