Light Guide Plate Absorption Filters for Display Color Deviation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional display devices, such as LCDs, suffer from color deviation and reduced display quality due to the absorption of relatively short-wavelength light by the light guide plate, leading to differences in light color emitted from regions adjacent to the light entrance and opposite surfaces.
Innovation Solution
A display device incorporating a light guide plate with absorption filters on its rear surface, featuring a first absorption layer with a higher refractive index and a second absorption layer with a lower refractive index, where the width of each absorption filter increases from the light entrance surface to the light opposite surface, helping to absorb relatively long-wavelength light and reduce color deviation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light guide plate absorbs short-wavelength light, then the light transmission is improved, but color deviation occurs and display quality deteriorates
Solution Approach 1:
The patent applies local quality by creating absorption filters with spatially varying widths on the rear surface of the light guide plate. The width of each absorption filter increases from the light entrance surface toward the light opposite surface, creating non-uniform light absorption characteristics across different regions. This local variation in absorption properties compensates for the non-uniform light distribution, thereby reducing color deviation while maintaining overall light transmission.
Solution Approach 2:
The patent employs parameter changes by modifying the refractive indices of the absorption layers. The first absorption layer has a first refractive index and the second absorption layer has a second refractive index lower than the first. By controlling and varying these refractive index parameters, the patent optimizes light absorption characteristics to reduce color deviation while preserving adequate light transmission for display quality.
2Object-affected harmful factors
If absorption filters are added to the light guide plate, then color deviation is reduced, but device complexity increases
Solution Approach 1:
The patent merges multiple absorption layers (first absorption layer and second absorption layer with different refractive indices) into a single integrated absorption filter structure on the light guide plate rear surface. This combining approach achieves complex light absorption functions through an integrated design rather than separate components, thereby reducing overall device complexity while maintaining color correction effectiveness.
Solution Approach 2:
The absorption filters serve multiple functions simultaneously: they absorb excess light energy, control wavelength distribution, and compensate for non-uniform light transmission across the display panel. This multi-functionality allows a single component to address color deviation issues without requiring additional separate systems, thus avoiding increased device complexity.
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
This configuration enhances display quality by minimizing color deviation and improving the uniformity of light emission, resulting in better image display.
Implementation Method 1
The absorption filters on the rear surface of the light guide plate each include a first absorption layer and a second absorption layer. The first absorption layer has a first refractive index. The second absorption layer is provided on the first absorption layer and has a second refractive index lower than the first refractive index
Implementation Method 2
The first absorption layer has a first refractive index. The second absorption layer is provided on the first absorption layer and has a second refractive index lower than the first refractive index
Data Source
AI summary
A display device includes a display panel which displays an image with light, a light guide plate through which the light is guided and which guides the light to the display panel, and an absorption filter provided in plural. The light guide plate defines a light exit surface thereof through which the light is emitted to the display panel and a rear surface thereof opposite to the light exit surface. The absorption filters are provided on the rear surface of the light guide plate. The absorption filters on the rear surface of the light guide plate each include a first filter layer and a second filter layer. The first filter layer has a first refractive index. The second filter layer is on the first filter layer and has a second refractive index lower than the first refractive index.