LCD Motion Picture Response Time Measurement System
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Solution Overview
Problem
Current methods for measuring motion picture response time (MPRT) of LCDs are costly and prone to errors due to speed and focus issues, leading to inconsistent measurement results.
Innovation Solution
A system and method that control an LCD display panel to switch between different gray levels, measuring brightness variations to obtain gray level response time (GLRT) curves, integrating these to calculate MPRT, and calculating an average time interval to determine the MPRT, using a computer and measurement device with a photosensitive element and analog-to-digital converter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-speed camera is used to capture motion picture variations, then measurement precision of MPRT is improved, but device cost and operational complexity increase significantly
Solution Approach 1:
The patent replaces the mechanical/optical system of high-speed cameras with an electrical measurement system. A display controller generates precise gray level transition signals, while a light sensor detects brightness changes. The system substitutes complex mechanical capture equipment with electronic signal generation and detection, achieving MPRT measurement through electrical means rather than optical-mechanical means.
Solution Approach 2:
The patent changes the measurement approach from capturing spatial-temporal video data to measuring electrical brightness parameters. By controlling gray level transitions and measuring corresponding brightness variations, the system transforms the measurement from a complex optical problem into a controlled electrical parameter measurement, where brightness is the key measured parameter that directly correlates to response time.
2Device complexity
If mobile camera is used to measure MPRT by capturing moving objects, then device cost is reduced, but measurement precision deteriorates due to speed errors and focus distance errors
Solution Approach 1:
The system performs preliminary action by pre-controlling the display to generate standardized gray level transition sequences before measurement begins. The display controller is programmed to switch between specific gray levels at predetermined times, creating a controlled test pattern that eliminates the need for dynamic tracking during measurement. This preliminary setup ensures that the measurement conditions are optimized and consistent.
Solution Approach 2:
The patent implements feedback by using the light sensor to detect actual brightness variations and comparing them against expected values. The system measures the time it takes for the display to transition between gray levels by detecting when the brightness reaches specific thresholds. This feedback mechanism allows precise determination of response times without requiring complex tracking algorithms.
3Adaptability or versatility
If multiple measurement instruments are used to measure MPRT, then measurement coverage is improved, but measurement consistency deteriorates due to different error sources
Solution Approach 1:
The patent creates a universal measurement system that can measure MPRT across different display types and conditions using a single standardized approach. The display controller can generate various gray level transition patterns, and the light sensor can detect responses under different conditions (different gray level combinations, different transition directions). This multi-functional capability allows the same basic system to handle diverse measurement scenarios without requiring instrument-specific calibration or procedures.
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 approach provides a reliable and cost-effective method for measuring MPRT, reducing errors and improving consistency compared to prior art, without the need for expensive equipment like high-speed cameras.
Implementation Method 1
a measurement device with a photosensitive element and analog-to-digital converter
Data Source
AI summary
A measurement system for measuring a motion picture response time (MPRT) of a liquid crystal display (LCD) has a computer and a measurement device. The computer controls a display panel of the LCD to switch between a plurality of different gray levels. The measurement device measures variations of brightness of the display panel when the display panel switches its gray level. The computer obtains at least a gray level response time (GLRT) normalized curve according to results of measuring the variations of the brightness. The computer integrates the at least a GLRT normalized curve to obtain at least an MPRT normalized curve, obtains at least a time interval of the at least an MPRT normalized curve, and calculates an average of the at least a time interval to obtain the MPRT of the LCD.