Color Filter Partition Wall Scattering for Light Efficiency
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Solution Overview
Problem
Liquid crystal display (LCD) apparatuses have low light efficiency and color reproducibility due to the reduction of white light after passing through red, green, and blue color filters, limiting the quality of color images displayed.
Innovation Solution
A color filter with a substrate, light-shielding areas, and color conversion layers using quantum dots that scatter and reflect light, along with a partition wall and transmission layers to enhance light efficiency and color conversion, reducing light loss and color mixing between adjacent pixel areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If white light passes through red, green, and blue color filters in an LCD apparatus, then color images are formed, but light efficiency is reduced to about 1/3
Solution Approach 1:
The patent changes the optical parameters by introducing a light scattering layer that redirects light paths, allowing light to interact with color conversion materials multiple times rather than passing through once, thereby improving light efficiency and reducing energy loss
Solution Approach 2:
The light scattering layer acts as an intermediary between the light source and color filters, mediating the interaction by scattering light to increase the probability of color conversion while maintaining overall light transmission efficiency
2Illumination intensity
If color filters are used to form color images, then color reproduction is achieved, but light efficiency deteriorates
Solution Approach 1:
The patent segments the color filtering function into separate color conversion layers for red, green, and blue, each with dedicated light scattering regions, allowing independent optimization of each color channel's light efficiency while maintaining accurate color reproduction
Solution Approach 2:
The light scattering layer is applied locally in specific regions between color conversion layers rather than uniformly throughout, optimizing light distribution in areas where color conversion occurs while preserving color accuracy
3Loss of energy
If light passes through multiple color filter layers, then color images are formed, but light loss increases
Solution Approach 1:
The light scattering layer creates continuous light paths that allow photons to undergo multiple interaction opportunities with color conversion materials, ensuring that light energy is continuously utilized for color conversion rather than being lost after a single pass
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
Improves light efficiency and color reproducibility by effectively scattering and reflecting light within the color filter, reducing power consumption and enhancing the quality of color images displayed.
Implementation Method 1
a partition wall in the light-shielding area and between the first color conversion pattern and the second color conversion pattern, the partition wall including a light-scattering material which scatters light incident thereto
Implementation Method 2
a first color conversion pattern in a first pixel area among the plurality of pixel areas and with which the incident light of the incident color is converted into light of a first color; and a second color conversion pattern in a second pixel area among the plurality of pixel areas and with which the incident light of the incident color is converted into light of a second color
Data Source
AI summary
A color filter includes a substrate including pixel areas and a light-shielding area which is disposed between adjacent pixels areas; and a color conversion layer which color-converts incident light of an incident color and emits color-converted light toward the substrate, the color conversion layer including a first color conversion pattern in a first pixel area among the pixel areas and with which the incident light of the incident color is converted into light of a first color; and a second color conversion pattern in a second pixel area among the pixel areas and with which the incident light of the incident color is converted into light of a second color; and a partition wall in the light-shielding area and between the first color conversion pattern and the second color conversion pattern, the partition wall including a light-scattering material which scatters light incident thereto.