Layered Photoelectric Pixel Layout for Accurate Phase Detection
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Solution Overview
Problem
In photoelectric conversion apparatuses where multiple photoelectric conversion elements are layered, the accuracy of autofocus and phase difference detection can be compromised due to crosstalk between layers, particularly when the separation directions of these elements differ, leading to decreased accuracy in phase difference detection.
Innovation Solution
The apparatus incorporates a layered structure with photoelectric conversion regions at different depths, where the first, second, and third portions separate regions at distinct depths and directions, with the angle between the first and third portions being less than or equal to 90 degrees, reducing interlayer overlap and crosstalk between photoelectric conversion regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If photoelectric conversion elements are laminated in the light incident direction to perform both imaging and phase difference detection, then the functionality is improved, but crosstalk between layers occurs which decreases measurement precision
Solution Approach 1:
The photoelectric conversion elements are divided into multiple layers with different separation directions. The first layer has photoelectric conversion elements separated in a first direction, while the second layer has photoelectric conversion elements separated in a second direction different from the first direction. This segmentation reduces crosstalk between adjacent elements by introducing directional separation at different depths, thereby improving phase difference detection accuracy while maintaining the dual functionality of imaging and phase difference detection.
2Ease of manufacture
If photoelectric conversion elements are separated in the same direction at all depths, then manufacturing is simplified, but crosstalk between laminated elements increases decreasing detection accuracy
Solution Approach 1:
The patent introduces asymmetry in the separation directions between layers. The first layer uses a first separation direction, while the second layer uses a second separation direction that is different from the first direction. This asymmetric arrangement optimizes the reduction of crosstalk effects while maintaining feasible manufacturing processes, achieving better phase difference detection accuracy without completely complicating the manufacturing procedure.
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 the accuracy of phase difference detection by minimizing signal transfer errors and maintaining consistent cross-section areas of photoelectric conversion regions across different depths, thereby improving the overall detection precision.
Implementation Method 1
a plurality of pixels each including a plurality of regions provided in a layer and a microlens
Data Source
AI summary
An apparatus includes pixels each including regions provided in a layer and a microlens. The layer has a first depth, a second depth, and a third depth between the first and second depths in order from a side of a surface facing a surface where the microlens is formed. The layer includes a first portion that separates the regions at the first depth and extends in a first direction, a second portion that separates the regions at the second depth and extends in a second direction, and a third portion that separates the regions at the third depth and extends in a third direction. An angle formed by the first and third portions and less than or equal to 90 degrees is smaller than an angle formed by the first and second portions and less than or equal to 90 degrees.