Display Device Parasitic Capacitance Noise Compensation
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Solution Overview
Problem
Existing display devices face challenges in achieving stable and reliable touch performance due to noise interference in capacitance sensing methods, which affect the accuracy of touch detection and position determination.
Innovation Solution
The implementation of a display device design that includes a base substrate with a display element layer, an insulation layer, an input sensing layer with a sensing electrode and a compensation electrode forming a parasitic capacitor, and a detection control circuit that utilizes offset capacitors to control capacitance and reduce noise interference, thereby enhancing touch detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If capacitance sensing method is used for touch detection, then touch detection capability is achieved, but noise interference reduces measurement precision
Solution Approach 1:
The patent converts the harmful parasitic capacitance formed between the driving electrode and sensing electrode into a beneficial controlled offset capacitor. By intentionally designing this parasitic capacitance path and using it to generate an offset signal, the system compensates for noise interference and improves touch detection accuracy. The harmful unintended capacitance is transformed into a useful compensation mechanism.
Solution Approach 2:
The patent implements feedback by detecting the offset signal generated from the parasitic capacitance and using it to compensate for noise in the touch detection system. The detection control circuit measures the capacitance variation in the parasitic capacitor and feeds back this information to adjust the sensing electrode's output, thereby reducing noise interference and improving measurement precision.
2Reliability
If compensation electrode is added to control parasitic capacitor, then noise reduction is achieved, but device complexity increases
Solution Approach 1:
The compensation electrode serves multiple functions: it acts as part of the input sensing layer structure, forms the offset capacitor with the driving electrode, and provides noise compensation. By making this single element multi-functional, the patent reduces the need for separate compensation components, thereby limiting the increase in device complexity while achieving improved reliability.
Solution Approach 2:
The patent merges the compensation function with the existing sensing layer structure by integrating the compensation electrode into the input sensing layer. Instead of adding a separate compensation circuit, the system combines the parasitic capacitance control and noise compensation functions within the existing layered structure, thereby minimizing additional complexity.
3Measurement precision
If offset capacitor is used to control parasitic capacitor capacitance, then measurement precision improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent converts the manufacturing imprecision of parasitic capacitance into a beneficial controlled offset. Rather than requiring precise control of the parasitic capacitor's exact capacitance value, the system uses the offset signal generated from this inherently variable capacitance to compensate for noise. This approach transforms the manufacturing precision problem into a robust noise compensation solution.
Solution Approach 2:
The patent changes the approach from controlling the absolute capacitance value to controlling the capacitance variation. By using the detection control circuit to measure and compensate for capacitance changes in the parasitic capacitor, the system focuses on parameter stability rather than absolute precision, thereby reducing manufacturing precision requirements while maintaining measurement accuracy.
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 design improves the reliability and accuracy of touch detection by counterbalancing the capacitance of parasitic capacitors with offset capacitors, leading to more precise determination of touch occurrence and position, even in the presence of temperature variations and noise.
Implementation Method 1
the sensing electrode and the driving electrode forming a parasitic capacitor
Implementation Method 2
The detection control circuit may control capacitance of the parasitic capacitor using a first offset capacitor. The first offset capacitor may be formed by the compensation electrode.
Data Source
AI summary
A display device, includes: a base substrate; a display element layer on the base substrate, the display element layer including a driving electrode; an insulation layer on the display element layer, the insulation layer defining an active region and a peripheral region adjacent to the active region; an input sensing layer on the insulation layer, the input sensing layer including a sensing electrode that overlaps the active region and a compensation electrode that overlaps the peripheral region, the sensing electrode and the driving electrode forming a parasitic capacitor; and a detection control circuit electrically connected through an output node to the sensing electrode and the compensation electrode, wherein the detection control circuit is configured to control a capacitance of the parasitic capacitor using a first offset capacitor, the first offset capacitor being formed by the compensation electrode.