LCD Panel Flicker Elimination via Photo Sensor Voltage Control
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Solution Overview
Problem
LCD panels often suffer from flicker issues due to variations in optimal common voltage during manufacturing, leading to inefficient manual adjustment processes that can result in human error and damage, particularly unsuitable for larger screens.
Innovation Solution
Incorporating a plurality of detecting areas with photo sensors in an LCD panel, connected to a timing controller, to measure and compare flicker levels, allowing for precise adjustment of the common electrode voltage to eliminate flicker by transforming brightness data into analog signals and adjusting the voltage accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual adjustment using a potentiometer is performed, then the LCD panel can be adjusted, but the adjustment precision is low and the LCD panel is liable to be accidentally damaged
Solution Approach 1:
The patent replaces the manual mechanical potentiometer adjustment system with an automated optical detection and control system. Photo sensors detect flicker levels, and a controller automatically adjusts the common voltage, eliminating manual contact and mechanical adjustment errors while improving precision and reducing damage risk.
Solution Approach 2:
The LCD panel performs self-diagnosis and self-adjustment through integrated photo sensors and controllers. The system automatically detects flicker conditions and adjusts common voltage without external manual intervention, enabling the panel to correct its own performance issues.
2Adaptability or versatility
If manual adjustment procedure is used, then small LCD panels can be adjusted, but the procedure is generally only suitable for small LCD panels and requires human operator involvement
Solution Approach 1:
The patent designs a universal adjustment system with multiple photo sensors positioned at different locations that can detect flicker across various LCD panel sizes. The same basic system architecture (photo sensors + controller) applies to both small and large LCD panels, making the solution adaptable to different screen dimensions without requiring size-specific procedures.
3Manufacturing precision
If meticulous adjustment by operator is performed, then adjustment is thorough, but human error in viewing the displayed image may still occur
Solution Approach 1:
The patent implements a closed-loop feedback system where photo sensors continuously monitor flicker levels, and the controller uses this real-time information to automatically adjust common voltage. This objective feedback mechanism eliminates subjective human judgment and ensures precise, consistent adjustment without operator error.
Solution Approach 2:
The system replaces subjective human visual assessment with objective optical detection through photo sensors. The sensors quantitatively measure flicker levels and provide data to the controller for precise adjustment, eliminating the variability and errors inherent in manual visual inspection.
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 method enables precise and automated adjustment of the common electrode voltage, effectively eliminating flicker across the LCD panel, improving accuracy and reducing the risk of damage, and is applicable to both small and large screens.
Implementation Method 1
Each of the first and second detecting area includes a photo sensor (e.g. a photonic diode or a photonic transistor, etc.). By comparing a flicker level of the first detecting area and a minimum value of the flicker level of the second detecting area through the photo sensors
Data Source
AI summary
An exemplary liquid crystal display (LCD) panel includes scan lines, data lines, a scan driver connected to the scan lines, a data driver connected to the data lines, a controller connected to the scan driver and the data driver, and pixels formed by the scan lines and the data lines. The LCD panel is divided into five detecting regions, and the first detecting region is in a center of the LCD panel, and others surround the center portion of the LCD panel. Each detecting region includes a photo sensor. The controller is used to control the five detecting regions to have substantially the same flicker level.