Asymmetric Color Filter for Semiconductor Display Luminance
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Solution Overview
Problem
Current display devices, such as LCDs and AMOLEDs, face issues with slow response time, limited flexibility, short lifespan, and poor viewing angle characteristics due to insufficient green or red light emission and structural limitations in semiconductor light emitting elements.
Innovation Solution
A flexible display device is designed with an asymmetric color filter structure that includes a wavelength conversion layer with phosphor layers and partition walls, where the width of filtering portions for blue light is narrower than for green and red, and incorporates a light scattering material like TiO2 to enhance viewing angle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional symmetric color filter structure is used, then the manufacturing process is simple, but the luminance of green and red colors is insufficient
Solution Approach 1:
The patent applies asymmetry by designing a color filter where the blue filtering portion has a different width compared to the green and red filtering portions. Specifically, the blue filtering portion is positioned to correspond with the partition wall of the semiconductor light emitting element, creating an asymmetric structure that optimizes light extraction for green and red wavelengths while maintaining manufacturability.
2Manufacturing precision
If the distance between the semiconductor light emitting element and the color filter is increased, then the manufacturing tolerance is improved, but the viewing angle characteristics deteriorate
Solution Approach 1:
The patent applies local quality by implementing a asymmetric color filter structure where the blue filtering portion has a specific width configuration that corresponds to the partition wall position. This local structural optimization allows the filter to function effectively at closer distances to the semiconductor light emitting element, improving viewing angle characteristics while maintaining adequate manufacturing tolerance through the targeted design of the blue filtering region.
3Illumination intensity
If the filling space of phosphor is enlarged, then the luminance of green and red is increased, but the structural reliability may be compromised
Solution Approach 1:
The patent applies asymmetry in the color filter design where the blue filtering portion is positioned to correspond with the partition wall, creating an asymmetric structure that optimizes phosphor filling space in the green and red regions. This asymmetric configuration allows enlarged phosphor filling space for improved green and red luminance while maintaining structural reliability through the strategic positioning of the blue filter relative to the partition wall structure.
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 the luminance of green and red colors, secures sufficient light emission, and alleviates blue color leakage, resulting in enhanced viewing angle characteristics and color purity.
Implementation Method 1
a wavelength conversion layer provided with a plurality of phosphor layers for converting wavelengths of light
Implementation Method 2
a color filter provided with a plurality of filtering portions for filtering blue, green, and red colors
Implementation Method 3
a structure of improving the viewing angle characteristics of blue... containing a light scattering or dispersing material only in a portion of filtering blue light
Data Source
AI summary
The present invention relates to a display device and, particularly, to a display device using a semiconductor light emitting element. The display device according to the present invention comprises: a substrate at which a wire electrode is formed; a plurality of semiconductor light emitting elements electrically connected to the wire electrode; a plurality of fluorescent material layers for converting a wavelength of light; a wavelength converting layer which has a plurality of partition wall portions formed between the plurality of fluorescent material layers and is disposed to cover the plurality of semiconductor light emitting elements; and a color filter which has a plurality of filtering portions for filtering blue, green, and red colors, and is disposed to cover the wavelength converting layer, wherein at least one of the plurality of filtering portions is configured to have a width different from those of the other filtering portions.