Display Panel Filter Structure with Expanded Lens Hole
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Solution Overview
Problem
Existing display panels face challenges in achieving high light extraction efficiency due to total reflection at the interface between the cover plate and air, which reduces brightness and requires increased power consumption.
Innovation Solution
The display panel incorporates a filter structure with a filter layer, a lens layer, and a filling layer, where the lens layer has a light transmission hole with a sidewall that expands away from the display substrate, and the filling layer has a higher refractive index than the lens layer, optimizing light convergence and reducing total reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional filter structure is used, then the display panel can be manufactured with standard processes, but light extraction efficiency is reduced due to total reflection at the cover plate-air interface
Solution Approach 1:
The filter structure is segmented into multiple functional layers: a filter layer for color filtering, a lens layer with light transmission holes for light convergence, and a filling layer with higher refractive index for reducing total reflection. Each layer performs a specific function to collectively improve light extraction efficiency while managing structural complexity.
Solution Approach 2:
The lens layer is designed with local quality variations through light transmission holes with specific patterns and refractive index distributions. The filling layer is strategically placed in regions where total reflection occurs most frequently, creating localized optical property modifications to enhance light extraction without uniformly increasing complexity across the entire structure.
2Illumination intensity
If the cover plate interface is modified to reduce total reflection, then light extraction efficiency improves, but manufacturing complexity increases
Solution Approach 1:
The refractive index parameter is changed by introducing a filling layer with a higher refractive index than the lens layer. This parameter modification reduces total reflection at the cover plate-air interface, improving brightness. The change is implemented through material selection and layer configuration rather than complex manufacturing processes, balancing performance improvement with manufacturing feasibility.
3Loss of energy
If different filter structures are used to optimize light extraction, then brightness improves, but brightness uniformity across different colors deteriorates
Solution Approach 1:
The lens layer and filling layer configuration serves multiple functions simultaneously: it converges light for all colors, reduces total reflection across different wavelengths, and maintains consistent optical properties for red, green, and blue filter structures. This universal design approach improves light extraction efficiency while preserving brightness uniformity across different color channels.
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 light extraction efficiency, improves brightness without increasing power consumption, and achieves consistent light extraction across different filter structures, thereby improving brightness uniformity.
Implementation Method 1
a refractive index of the filling layer is greater than the refractive index of the lens layer where the light transmission hole filled by the filling layer is located
Data Source
AI summary
A display panel includes a display substrate, a filter structure and a cover plate. At least a part of the filter structure includes a filter layer, a lens layer and a filling layer, and the lens layer is located on a side of the filter layer away from the display substrate, and is provided with a first light transmission hole, and the side wall of the first light transmission hole is expanded along the direction away from the display substrate; the filling layer is filled in the first light transmission hole, and the refractive index of the filling layer is greater than that of the lens layer where the first light transmission hole filled by the filling layer is located.