Integrated Polarization-Diffusion LCD Structure for Thin Backlight
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Solution Overview
Problem
Existing liquid crystal displays with edge type backlight units face issues with non-uniform light distribution and energy efficiency due to the stacking of optical films, which can lead to increased thickness and the generation of brightness irregularities and patterns like Moire and rainbow Mura when attempting to make the displays ultra-thin.
Innovation Solution
Integrating a diffusion sheet with engraved patterns or beads on a lower polarization plate, creating an air layer between the diffusion sheet and the polarization plate to enhance light condensing and diffusion while maintaining thinness, thereby preventing brightness irregularities and pattern failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If optical films are stacked to improve light distribution uniformity, then light uniformity is improved, but display thickness increases
Solution Approach 1:
The patent combines the lower polarization plate and diffusion sheet into a single integrated structure, eliminating the need for separate stacking of optical films. The diffusion sheet is positioned in direct contact with the lower polarization plate, merging two functional layers into one unified component that maintains both polarization and light diffusion functions while reducing overall thickness.
Solution Approach 2:
The patent introduces a reflective layer as an intermediary between the light guide plate and the integrated polarization-diffusion structure. This reflective layer mediates the interaction between components by reflecting stray light back into the light guide plate, improving light utilization efficiency and enhancing the overall light distribution uniformity without requiring additional optical film layers.
2Illumination intensity
If optical films are stacked to improve light condensing, then light condensing is improved, but brightness irregularities and patterns occur
Solution Approach 1:
By integrating the diffusion sheet with the lower polarization plate in direct contact, the patent eliminates air gaps and interfaces between separate optical films. This merged structure prevents the formation of Moire patterns and rainbow Mura effects that occur when multiple optical films are stacked with adhesive layers, while still maintaining effective light condensing and diffusion functions.
Solution Approach 2:
The patent removes the adhesive layers that are typically required when stacking multiple optical films separately. By eliminating these adhesive intermediaries and achieving direct contact between the polarization plate and diffusion sheet, the source of brightness irregularities and pattern failures is extracted from the system, resulting in improved brightness uniformity.
3Length of stationary object
If display is made ultra-thin by reducing optical films, then thickness is reduced, but light distribution uniformity deteriorates
Solution Approach 1:
The integrated structure of the lower polarization plate combined with the diffusion sheet performs multiple functions simultaneously: polarization, light diffusion, and light condensing. This multi-functional design eliminates the need for separate optical films, achieving ultra-thin display thickness while maintaining excellent light distribution uniformity through the synergistic interaction of the combined layers.
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 improves light condensing and diffusion characteristics, increasing brightness and reducing peak angles, resulting in a more uniform and efficient backlight with reduced thickness, effectively addressing the challenges of non-uniformity and energy efficiency.
Implementation Method 1
creating an air layer between the diffusion sheet and the polarization plate to enhance light condensing and diffusion
Data Source
AI summary
A liquid crystal display (LCD) is disclosed. The liquid crystal display (LCD) comprises an LCD panel, an upper polarization plate over the LCD panel, a lower polarization plate under the LCD panel, an adhesive layer under the lower polarization plate, a diffusion sheet under the adhesive layer, and an irregular air layer between at least part of the adhesive layer and the diffusion sheet.