Light Collection Elements in Optical Pixels for Quantum Efficiency
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Solution Overview
Problem
In optical devices with wave guide color filter (WGCF)-type structures, the absorption of oblique light by metal grids leads to a decrease in quantum effect (QE) especially for peripheral pixels, necessitating an improvement in the QE spectrum.
Innovation Solution
The implementation of high-refractive-index (n=1.6-1.9) light collection elements with specific dimensions and positions above color filters, where the width or thickness of light collection elements in peripheral pixels is greater than those near the central pixels, and the distance and position of these elements are optimized to be opposite to the pixel-arrangement direction, ensuring improved light collection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a wave guide color filter (WGCF)-type structure is used, then the device structure is simplified and manufacturing is easier, but the quantum efficiency (QE) drops especially for peripheral pixels due to metal grid absorption
Solution Approach 1:
The patent introduces light collection elements with different dimensions and positions specifically for peripheral pixels versus central pixels. The light collection elements in peripheral pixels have larger dimensions and are positioned differently to compensate for the stronger absorption effect of metal grids in those regions, thereby locally optimizing quantum efficiency without changing the overall WGCF structure
Solution Approach 2:
The patent changes the parameters of light collection elements (size, position, shape) based on their location on the substrate. By adjusting these parameters, the patent optimizes light collection efficiency for peripheral pixels while maintaining the simplified WGCF structure, thus improving quantum efficiency without sacrificing ease of manufacture
2Reliability
If light collection elements with larger dimensions are used in peripheral pixels, then quantum efficiency is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by making light collection elements in peripheral pixels different from those in central pixels. Specifically, peripheral light collection elements have larger dimensions and different positions to compensate for metal grid absorption, while central pixels use standard-sized elements. This localized differentiation improves quantum efficiency only where needed without unnecessarily complicating the entire device
Solution Approach 2:
The patent segments the substrate into different regions (central region and peripheral regions) and applies different light collection element configurations to each region. This segmentation allows optimization of quantum efficiency in peripheral regions without affecting or complicating the simpler central region design
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 significantly enhances the quantum efficiency peaks of color filters, particularly for pixels in the peripheral region of the substrate, thereby improving the overall performance of the optical device.
Implementation Method 1
a light collection layer surrounded by the organic layer formed in the first region and the second region, a first light collection element of the light collection layer formed in the first pixel, and a second light collection element of the light collection layer formed in the second pixel
Implementation Method 2
The implementation of high-refractive-index (n=1.6-1.9) light collection elements with specific dimensions and positions above color filters
Data Source
AI summary
An optical device is provided. The optical device includes a central region having a plurality of central pixels, a first region having a plurality of first pixels, a second region having a plurality of second pixels, an organic layer formed in the central region, the first region and the second region, a light collection layer surrounded by the organic layer formed in the first region and the second region, a first light collection element of the light collection layer formed in the first pixel, and a second light collection element of the light collection layer formed in the second pixel. The central region, the first region and the second region are spaced from each other along an arrangement direction, and the first region is closer to the central region than the second region. The first light collection element is different from the second light collection element.