Light Sensing Apparatus Voltage Offset Calibration
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Solution Overview
Problem
Light sensing in-cell touch panels experience sensing result errors due to voltage offset between gate and source terminals over time, affecting the accuracy of touch detection.
Innovation Solution
A light sensing apparatus with a feedback path, comprising a light sensing module, signal conversion module, and processing module, which outputs sense signals and adjusts light sensing characteristics by providing an adjustable driving voltage based on relative differences and accumulated values to maintain accurate touch detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light sensing apparatus uses thin-film transistors to detect touch based on leakage current variation, then touch detection capability is achieved, but voltage offset between gate and source terminals occurs over time causing sensing result errors
Solution Approach 1:
The patent applies preliminary action by performing calibration of the light sensing apparatus before actual touch detection operations. The calibration process pre-adjusts the threshold values and compensates for initial voltage offsets, ensuring accurate sensing from the start of operation. This prevents sensing errors that would otherwise accumulate over time due to voltage drift.
Solution Approach 2:
The patent implements feedback mechanisms where the sensing apparatus continuously monitors its own output signals and compares them against reference values. When voltage offset causes threshold deviation, the system automatically adjusts the threshold values based on the monitored signals, creating a closed-loop control that maintains accurate touch detection despite component aging or environmental changes.
2Duration of action of stationary object
If the light sensing apparatus operates for a relatively long time, then continuous touch detection is achieved, but the voltage difference between gate and source terminals develops an offset changing light sensing characteristics
Solution Approach 1:
The patent applies periodic action by implementing regular calibration cycles during operation. The system periodically recalibrates the threshold values and adjusts sensing parameters at predetermined time intervals or after a certain number of operations, preventing the accumulation of voltage offset effects and maintaining measurement precision throughout extended operating durations.
Solution Approach 2:
The light sensing apparatus performs self-calibration and self-adjustment without requiring external intervention. The system automatically detects its own threshold deviations and corrects them through internal feedback mechanisms, enabling it to maintain accurate light sensing characteristics independently over long operating periods despite component aging.
3Ease of operation
If the light sensing module outputs sense signals based on light intensity, then touch detection is enabled, but sensing result errors occur due to voltage offset
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the threshold values and sensing parameters based on detected voltage offset conditions. When voltage offset is detected, the system modifies the threshold parameters to compensate for the shift, ensuring that touch detection remains accurate despite changes in electrical characteristics over time or environmental variations.
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
Prevents sensing result errors by adjusting light sensing characteristics, ensuring accurate touch detection and reducing the impact of component aging in light sensing modules.
Implementation Method 1
the determination of a light sensing apparatus whether or not is being switched-on, so as to further determine whether or not the LCD in-cell is being touched, is based on the leakage current variation caused by different light intensities emitted thereon
Data Source
AI summary
A light sensing apparatus includes a light sensing module, a signal conversion module and a processing module. The light sensing module is configured to output a first and second sense signals according to a light intensity emitting thereon. The signal conversion module is electrically coupled to the light sensing module and configured to receive the first and second sense signals and output a sense value according to a relative difference between the first and second sense signals, The comparison module is electrically coupled to the signal conversion module and configured to adjust a light sensing characteristic of the light sensing module according to the sense value so as to adjust a light sensing characteristic of the light sensing module. An adjustment method for a light sensing apparatus is also provided.