Decoupling Capacitor Placement for Signal Interference Reduction
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Solution Overview
Problem
The increasing complexity and signal transmission speed in display devices lead to significant interference between sensor drivers and display drivers, which affects the accuracy and reliability of user inputs.
Innovation Solution
A display device configuration that includes a circuit board with decoupling capacitors and sensor connection lines forming low-pass filters to isolate sensor signals from data signals, preventing interference between the sensor driver and display driver, while maintaining a minimal configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the display area is enlarged and resolution is increased, then user demand is satisfied, but signal interference between sensor driver and display driver increases
Solution Approach 1:
The patent introduces decoupling capacitors as intermediary components connected to sensor connection lines at crossing points with data signal lines. These capacitors act as mediators that filter high-frequency noise from data signals before they interfere with sensor signals, thereby reducing signal interference while maintaining the enlarged display area and high resolution configuration
2Speed
If transmission speed of signals is increased, then integration of internal circuits is improved, but interference between signals becomes more severe
Solution Approach 1:
Decoupling capacitors are positioned at critical crossing points between sensor connection lines and data signal lines to intercept and filter high-frequency noise generated by fast-transmitting data signals. This allows the system to maintain high transmission speeds while preventing the associated electromagnetic interference from corrupting sensor readings
3Device complexity
If degree of integration of internal circuits is increased, then display device functionality is improved, but signal interference between sensor driver and display driver increases
Solution Approach 1:
The patent strategically places decoupling capacitors at specific crossing points within the integrated circuit layout where sensor connection lines intersect with data signal lines. These capacitors serve as localized filters that prevent interference in the densely integrated circuit environment without requiring reduction of integration degree
4Measurement precision
If decoupling capacitors are added to prevent signal interference, then signal accuracy is improved, but device complexity increases
Solution Approach 1:
Rather than uniformly adding decoupling capacitors throughout the entire circuit, the patent applies them selectively only at specific crossing points where sensor connection lines intersect with data signal lines. This localized approach provides necessary signal filtering and accuracy improvement while minimizing the increase in overall device complexity
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 effectively reduces signal interference, ensuring accurate and reliable user input detection with minimal additional components, enhancing the overall performance of the display device.
Implementation Method 1
A portion of the first sensor connection line, which extends between the first point and the sensor driver, the first decoupling capacitor, and the second decoupling capacitor may constitute a low pass filter
Implementation Method 2
a first decoupling capacitor connected to the first sensor line disposed between the sensor driver and a first point where the first sensor connection line and the data extension line cross
Data Source
AI summary
A display device of the disclosure includes a panel including pixels, and first sensors and second sensors overlapping the pixels, and a circuit board. The circuit board includes a first sensor pad electrically connected to a respective first sensor, a second sensor pad electrically connected to a respective second sensor, and a data pad electrically connected to respective pixels, a sensor driver, a first sensor line having one end connected to the first sensor pad and another end connected to the sensor driver, a second sensor line having one end connected to the second sensor pad and another end connected to the sensor driver, a data extension line having one end connected to the data pad, and a first decoupling capacitor connected to the first sensor line disposed between the sensor driver and a first point where the first sensor line and the data extension line cross.