Color Filter Lens Layout for Oblique-Angle Color Fidelity
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Solution Overview
Problem
Existing display devices face challenges in maintaining color fidelity and luminance, particularly when viewed from oblique angles, due to light leakage and mixing across sub-pixels with conventional lens configurations.
Innovation Solution
A color filter design featuring elongated sub-pixels with lenses positioned in the longitudinal direction, accompanied by a planarization layer and light shielding walls, to condense and direct light according to specific wavelength ranges, minimizing light leakage and enhancing luminance and visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lens configurations are used with standard sub-pixel arrangements, then device complexity is reduced, but color fidelity deteriorates and luminance decreases when viewed from oblique angles due to light leakage and mixing across sub-pixels
Solution Approach 1:
The patent divides each sub-pixel into multiple elongated regions along the longitudinal direction, with multiple lenses assigned to each sub-pixel. This segmentation allows independent optical control of different wavelength ranges within each sub-pixel, preventing light mixing and maintaining color fidelity while viewing from oblique angles.
Solution Approach 2:
The patent introduces a longitudinal direction dimension to the sub-pixel structure, creating elongated sub-pixels with aspect ratio greater than 1. Multiple lenses are arranged along this longitudinal direction, adding spatial dimensionality to the optical path control and enabling better separation of light from different wavelength ranges.
2Illumination intensity
If multiple lenses are positioned in the longitudinal direction of elongated sub-pixels, then front luminance is improved and color mixing is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies different optical properties to different regions of the sub-pixel by positioning multiple lenses with specific focal lengths and aperture ratios at different locations along the longitudinal direction. Each lens is optimized for its local region, improving overall luminance while the systematic arrangement helps manage positioning precision requirements.
Solution Approach 2:
The patent optimizes specific parameters including the aspect ratio of elongated sub-pixels (greater than 1), the spacing and positioning of multiple lenses along the longitudinal direction, and the spectral transmission ranges of different lens regions. These parameter optimizations improve front luminance while providing clear manufacturing specifications.
3Power
If sub-pixels are made elongated with aspect ratio greater than 1, then light condensation and directionality are improved, but area of each sub-pixel is reduced
Solution Approach 1:
The patent compensates for the reduced width of elongated sub-pixels by extending the longitudinal dimension, creating an aspect ratio greater than 1. Multiple lenses are arranged along this extended longitudinal direction, distributing the light condensation function across multiple elements rather than requiring a single large-area lens.
Solution Approach 2:
The patent segments the light condensation function across multiple lenses arranged along the longitudinal direction of elongated sub-pixels. This segmentation allows each lens to be smaller while collectively providing the required light condensation efficiency, thus maintaining power while managing area constraints.
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 proposed design improves front luminance and reduces color mixing, especially when viewed obliquely, by effectively guiding light through elongated sub-pixels with multiple lenses and light shielding, resulting in enhanced image clarity and visibility.
Implementation Method 1
lenses configured to condense light passing through the sub-pixels
Data Source
AI summary
A color filter including sub-pixels having transmission wavelength ranges different from each other in a region forming a unit pixel for color display, and lenses facing respective ones of the sub-pixels and configured to condense light passing through the sub-pixels. At least one of the sub-pixels is an elongated pixel whose ratio of a length in a longitudinal direction to a length in a lateral direction is larger than 1 when viewed in a thickness direction in which the light passes through the sub-pixels, and at least two of the lenses that condense the light passing through the elongated pixel are positioned in the longitudinal direction.