Flicker Measuring Device Using Shift Times for LCD Temporal Variation
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Solution Overview
Problem
Existing flicker measuring devices for liquid crystal displays struggle to simply represent the temporal change in flicker values, which are affected by manufacturing variations and power source frequency, leading to complex spatial and temporal variations in flicker values, especially in portable devices with reduced vertical synchronization frequencies.
Innovation Solution
A flicker measuring device that receives light from the display, outputs light reception signals, and calculates flicker shift times by determining initial and steady-state flicker values, allowing for the representation of flicker value changes through 50% and 90% change values and corresponding shift times, simplifying the representation of temporal changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the frequency of the vertical synchronization signal is reduced to less than 60 Hz to reduce power consumption, then power consumption is reduced and battery drive time is extended, but the flicker value increases
Solution Approach 1:
The patent applies parameter changes by measuring the flicker value at multiple different vertical synchronization frequencies (e.g., 60 Hz, 50 Hz, 40 Hz, 30 Hz) and storing these measurements. This allows the system to characterize flicker behavior across different operating conditions and select optimal parameters for minimizing flicker while maintaining low power consumption.
Solution Approach 2:
The patent performs preliminary measurements of flicker values at various vertical synchronization frequencies during the manufacturing or setup phase. These pre-measured flicker characteristics are stored and used to predict and compensate for flicker issues before the device is actually used, allowing for proactive optimization of display parameters.
2Measurement precision
If the flicker value changes are indicated as they are without processing, then all temporal and spatial variations are captured, but the representation becomes complicated and difficult to understand
Solution Approach 1:
The patent segments the complex flicker data by dividing the display into multiple measurement positions and measuring flicker values at each position separately. It also segments the temporal dimension by measuring at different vertical synchronization frequencies. This segmentation allows the complex spatial and temporal variations to be organized into manageable, interpretable components.
Solution Approach 2:
The patent introduces an intermediary processing step that calculates the standard deviation of flicker values across different measurement positions and frequencies. This standard deviation serves as a simplified metric that captures the essential variation information without presenting the full complexity of the raw data, making it easier to interpret and compare.
3Measurement precision
If multiple flicker measurements are taken at different positions and times to capture spatial and temporal variations, then measurement completeness is improved, but the data processing and analysis become more complex
Solution Approach 1:
The patent merges multiple flicker measurements taken at different positions, times, and frequencies into a single comprehensive metric - the standard deviation of flicker values. This consolidation combines all the spatial and temporal variation data into one interpretable value that represents the overall flicker characteristics without requiring separate analysis of each measurement point.
Solution Approach 2:
The patent creates a simplified copy or representation of the complex flicker data through the standard deviation metric. Instead of dealing with the full complexity of spatial and temporal variations, the system uses this derived metric as a representative copy that captures the essential flicker behavior for comparison and analysis purposes.
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
The device effectively simplifies the representation of flicker value changes by using 50% and 90% shift times, providing indices for temporal changes and spatial distributions, enabling easier management and understanding of flicker values across the display.
Implementation Method 1
a light receiver that receives light emitted from the object to be measured and outputs a light reception signal corresponding to an amount of received light
Data Source
AI summary
A flicker measuring device of the present invention: receives light emitted from an object to be measured and outputs a light reception signal corresponding to an amount of received light; acquires the output light reception signal a plurality of times from a measurement start time point to a steady time point at which the object to be measured is in a steady state, obtains a flicker value of the object to be measured for each of the plurality of times on the basis of the acquired light reception signal, and stores the flicker value obtained for each of the plurality of times in a storage in association with an acquisition time point of the light reception signal; and performs an arithmetic processing of obtaining a flicker shift time by using each flicker value stored, in which in the arithmetic processing, an amount of overall change is obtained that is an amount of change of the flicker value from the initial flicker value to the steady flicker value, a predetermined ratio time point is obtained at which an amount of change of the flicker value from the reference flicker value is a predetermined ratio of the amount of overall change, and an elapsed time between the predetermined ratio time point and the reference time point is obtained as the flicker shift time.