Photoelectric Pixel Readout Layout for Crosstalk Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In photoelectric conversion devices with multiple pixels arranged in rows and columns, crosstalk occurs due to parasitic capacitance between signal lines for display and sensing images, affecting signal reading speed and quality.
Innovation Solution
The device employs multiple column signal lines for each column, with specific vertical scanning techniques and the use of an electric conductor between signal lines to reduce crosstalk, allowing parallel reading of display and sensing image signals without interfering with each other.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If multiple column signal lines are arranged in each pixel column to increase signal reading speed, then reading speed is improved, but crosstalk occurs between signal lines due to parasitic capacitance
Solution Approach 1:
A shield electrode is introduced as an intermediary element between the first and second column signal lines. This shield electrode acts as a mediator that blocks parasitic capacitance coupling between adjacent signal lines, thereby reducing crosstalk noise while allowing the multiple signal lines to maintain high reading speed
Solution Approach 2:
The harmful parasitic capacitance effect is extracted and isolated by placing the shield electrode between signal lines. The shield electrode specifically targets and removes the crosstalk component between adjacent column signal lines, separating the harmful electromagnetic interaction from the useful signal transmission
2Productivity
If two column signal lines are arranged in each pixel column for parallel reading, then productivity is improved, but noise from crosstalk increases
Solution Approach 1:
The shield electrode serves as a protective intermediary that enables parallel reading operations between first and second column signal lines while blocking noise interference. This allows simultaneous or alternating reading from multiple pixel groups through different signal lines without mutual interference
Solution Approach 2:
The column signal lines are segmented into first and second groups with the shield electrode creating electrical separation. This segmentation allows independent operation of each signal line group, enabling parallel reading workflows while maintaining signal integrity through the shielding barrier
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 approach effectively reduces noise components from crosstalk, enabling simultaneous or parallel reading of display and sensing image signals, improving signal quality and reading speed.
Implementation Method 1
crosstalk can occur, through a parasitic capacitance, between the signal line for obtaining a display image and the signal line for obtaining a sensing image
Data Source
AI summary
Photoelectric conversion device having pixels forming rows and columns, column signal lines, and read circuit for reading signals from the pixels via the column signal lines. The column signal lines include first signal lines and second signal lines for each column. The rows include first group rows forming first group, and second group rows forming second group. The read circuit performs first vertical scanning of reading signals of pixels in the first group rows via the first signal lines, and second vertical scanning of reading signals of pixels in the second group rows via the second signal lines, and the second vertical scanning is performed in period of the first vertical scanning. Electric conductor connected to none of the pixels in the period is arranged between the first signal lines and the second signal lines.