Photoelectric Sensor Layout With Shared Signal Lines and Constant Pitch
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Solution Overview
Problem
Optical detection devices face a challenge in maintaining positional accuracy while increasing the aperture ratio, as the symmetric arrangement of photoelectric conversion elements and transistors with signal lines interposed between them can lead to uneven arrangement pitches, affecting detection precision.
Innovation Solution
A detection device configuration where signal lines are arranged between adjacent photoelectric conversion elements, extending in a direction orthogonal to the elements, allowing for equal arrangement pitches and improved aperture ratio by sharing signal lines between detection elements, thus maintaining positional accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If photoelectric conversion elements and transistors are symmetrically arranged with signal lines interposed between them, then the aperture ratio is increased, but the arrangement pitch of photoelectric conversion elements becomes non-constant, decreasing positional accuracy
Solution Approach 1:
The patent divides the signal line configuration into separate dedicated lines for each photoelectric conversion element rather than sharing lines between elements. This segmentation allows each element to have its own direct signal path, maintaining constant arrangement pitch while still achieving high aperture ratio by eliminating shared line infrastructure.
Solution Approach 2:
The patent applies different arrangement configurations to different regions: photoelectric conversion elements are arranged in a regular grid pattern with constant pitch for high positional accuracy, while signal lines are routed through peripheral regions or using independent paths to avoid interfering with the element arrangement, allowing aperture ratio to be maximized without compromising pitch uniformity.
2Area of moving object
If signal lines are shared between adjacent pixels, then the aperture ratio is increased, but the arrangement pitch cannot be kept constant
Solution Approach 1:
Instead of sharing signal lines between adjacent pixels, the patent assigns dedicated signal lines to each photoelectric conversion element. This eliminates the need for elements to be asymmetrically positioned around shared lines, allowing constant arrangement pitch while maintaining high aperture ratio through efficient space utilization.
Solution Approach 2:
The patent routes signal lines in directions orthogonal to the main array arrangement or through three-dimensional wiring layers, separating the signal line placement dimension from the photoelectric conversion element arrangement dimension. This allows elements to maintain constant pitch in the primary plane while signal lines occupy different spatial dimensions, achieving both high aperture ratio and manufacturing precision.
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 configuration enhances the aperture ratio by approximately 15% compared to traditional layouts and ensures consistent arrangement pitches, thereby restraining the reduction in positional accuracy.
Implementation Method 1
a plurality of photoelectric conversion elements provided to the substrate and each including a semiconductor layer having a photovoltaic effect
Data Source
AI summary
A detection device includes: a substrate; photoelectric conversion elements provided to the substrate; transistors; and signal lines each of which is between adjacent photoelectric conversion elements. Each detection element includes one of the photoelectric conversion element and the transistors adjacent to the photoelectric conversion element. A first signal line among the signal lines is between the photoelectric conversion element of a first detection element and the photoelectric conversion element of a second detection element adjacent to one side of the first detection element and is coupled to the first detection element and the second detection element. A second signal line among the signal lines is between the photoelectric conversion element of the first detection element and the photoelectric conversion element of a third detection element adjacent to another side of the first detection element and is coupled to the first detection element and the third detection element.