Common Voltage Distortion Detection Circuit for LCD Power Optimization
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Solution Overview
Problem
Liquid crystal display devices face issues with flicker, overheating, and cross talk due to common voltage distortion, which cannot be completely eliminated by compensation methods and result in increased power consumption.
Innovation Solution
A common voltage distortion detecting circuit is implemented, comprising a current sensor, voltage difference detecting circuit, and comparator, which monitors the common voltage applied to the liquid crystal display panel and converts the inversion method in real-time when an overcurrent is detected, using a current shunt mirror and voltage generator to amplify and compare voltages, thereby adjusting the inversion method to reduce distortion and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If compensation method is applied to reduce flicker, overheating, and cross talk, then display quality is improved, but common voltage distortion cannot be completely eliminated and power consumption increases
Solution Approach 1:
The patent implements dynamic switching between normal driving mode and compensation driving mode based on real-time detection of common voltage distortion. The system transitions from static compensation to dynamic adaptive compensation, activating compensation circuits only when distortion is detected, thereby reducing unnecessary power consumption while maintaining display quality when needed.
Solution Approach 2:
The patent introduces a feedback mechanism where common voltage distortion is continuously monitored and used to control the switching between driving modes. The detection circuit provides feedback signals that trigger the compensation mode when distortion exceeds thresholds, creating a closed-loop system that optimizes power consumption based on actual voltage conditions.
2Reliability
If compensation method is applied to reduce flicker, overheating, and cross talk, then display quality is improved, but common voltage distortion cannot be completely eliminated
Solution Approach 1:
The system dynamically switches between normal and compensation driving modes based on real-time voltage distortion detection. When distortion is detected, the system transitions to compensation mode with adjusted inversion methods and timing, enabling adaptive correction that maintains voltage stability without requiring permanent circuit modifications.
Solution Approach 2:
The patent changes driving parameters such as inversion method, timing, and voltage levels dynamically based on detected distortion conditions. By adjusting these parameters in response to voltage variations, the system compensates for distortion effects without requiring precise manufacturing tolerances, thereby maintaining display quality despite voltage fluctuations.
3Reliability
If real-time inversion method conversion is implemented, then display quality and power efficiency are improved, but device complexity increases
Solution Approach 1:
The patent implements multi-functional circuits that perform both normal driving and compensation functions using the same hardware components. The driving circuit can operate in multiple modes (normal and compensation) by switching control signals, eliminating the need for separate dedicated compensation circuits and reducing overall system complexity.
Solution Approach 2:
The patent introduces a control circuit as an intermediary that manages the switching between normal and compensation modes. This intermediary component coordinates the detection circuit, driving circuit, and compensation elements, simplifying the overall control logic by centralizing mode management rather than requiring complex distributed control throughout the system.
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 solution effectively stabilizes display quality, reduces overheating, and minimizes power consumption by dynamically adjusting the inversion method in response to common voltage distortion, thereby improving the overall performance and efficiency of liquid crystal display devices.
Implementation Method 1
The voltage difference detecting circuit is configured to detect a difference voltage between two terminals of the current sensor
Implementation Method 2
the voltage difference detecting circuit may include a current mirror which amplifies amplitude of a voltage or a current
Implementation Method 3
The comparator is configured to compare the difference voltage and a reference voltage to output an over current signal
Implementation Method 4
The voltage generator may include a voltage divider configured to divide into the power voltage outputted through the input power terminal to generate the reference voltage
Data Source
AI summary
A common voltage distortion detecting circuit includes a current sensor, a voltage difference voltage detecting circuit and a comparator. The current sensor is disposed between a circuit configured to apply a common voltage to a liquid crystal display panel and an input power terminal providing a power voltage. The voltage difference detecting circuit is configured to detect a difference voltage between two terminals of the current sensor. The comparator is configured to compare the difference voltage and a reference voltage to output an over current signal to convert an inversion method of the liquid crystal display panel when the difference voltage is greater than the reference voltage.