LCD Response Time Measurement with Dynamic ADC Range
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Solution Overview
Problem
Current LCD response time measurement systems are expensive and lack dynamic accuracy adjustment capabilities, making them inaccessible to ordinary users and inefficient for precise measurements.
Innovation Solution
A measurement system comprising a photosensitive element, an analog-to-digital converter (ADC) with a dynamically adjustable voltage range, and a transmission interface that converts brightness variations into digital signals for computer-based response time calculation, allowing for cost-effective and accurate LCD response time measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional measurement systems are used to measure LCD response time, then measurement capability is provided, but the cost is high and accessibility is poor
Solution Approach 1:
The system segments the measurement function into independent modular components: photosensitive element for light detection, ADC for signal conversion, reference voltage source for accuracy, and computer for calculation. This modularization allows each component to be selected independently, enabling cost-effective implementations while maintaining measurement precision.
Solution Approach 2:
The measurement system uses universal components that can serve multiple purposes. The photosensitive element detects brightness variations from any LCD display, the ADC converts various voltage signals, and the computer processes different measurement data. This universality allows the same system architecture to measure response times across different LCD types without requiring specialized expensive equipment.
2Measurement precision
If fixed accuracy measurement devices are used, then measurement is possible, but dynamic accuracy adjustment capability is lacking
Solution Approach 1:
The system implements dynamic accuracy adjustment by allowing the reference voltage source to be modified during operation. The reference voltage, which directly determines ADC conversion accuracy, can be changed based on measurement requirements. This enables the system to adapt between high-precision measurements (using higher reference voltages) and standard measurements (using lower reference voltages), providing both fixed and variable accuracy modes.
Solution Approach 2:
The system changes the reference voltage parameter to adjust measurement accuracy dynamically. By varying the reference voltage level, the ADC's voltage range mapping changes, which directly affects the precision of brightness variation detection. This parameter adjustment allows the system to optimize accuracy for different measurement scenarios without requiring hardware changes.
3Measurement precision
If high accuracy measurement is implemented, then measurement precision improves, but system complexity increases
Solution Approach 1:
The system introduces a reference voltage source as an intermediary component between the LCD display and the ADC converter. This intermediary provides a stable voltage reference that enables high-precision measurements without requiring complex ADC hardware. The reference voltage acts as a mediator that translates brightness variations into accurate digital values, simplifying the overall measurement architecture while maintaining high precision.
Solution Approach 2:
The system replaces complex mechanical or electronic adjustment mechanisms with a simple voltage reference approach. Instead of using complex variable resistors, switching networks, or multiple precision components to achieve accuracy adjustment, the system simply changes the reference voltage level. This substitution dramatically reduces system complexity while maintaining the ability to provide high-precision measurements when needed.
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
Enables affordable and precise measurement of LCD response time by dynamically adjusting the ADC's voltage range, improving measurement accuracy and accessibility for users.
Implementation Method 1
a photosensitive element sensing variations of brightness of a display panel of the LCD to generate a voltage signal
Data Source
AI summary
A measurement system has a photosensitive element, an analog-to-digital converter (ADC), a reference voltage source, and a transmission interface. The photosensitive element senses variations of brightness of a display panel of a liquid crystal display (LCD) to generate a voltage signal. The ADC converts the voltage signal into a digital signal. The reference voltage source provides a reference voltage to the ADC to drive the ADC to dynamically adjust a convertible voltage range of the ADC for any voltage inputted to the ADC according to the reference voltage. The transmission interface transmits the digital signal to a computer to trigger the computer to calculate a response time of the LCD according to the digital signal.