Flicker Quantification System for Display Driving
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Solution Overview
Problem
Display devices face challenges in quantifying flicker occurrence conditions, particularly when driven at different frequencies, which affects power consumption and user experience.
Innovation Solution
A flicker quantification system that includes a display device, a luminance measurer, a voltage measurer, and a processor to calculate a flicker index value based on luminance and voltage data, using specific equations to assess the flicker occurrence condition across various gray levels and frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the display device is driven at a lower driving frequency to reduce power consumption, then power consumption is reduced, but flicker occurrence increases
Solution Approach 1:
The patent changes the driving parameters by introducing different scan frequencies for different scan lines (first scan lines at frequency f1, second scan lines at frequency f2 where f1 ≠ f2). This parameter differentiation allows the display to operate at lower overall power consumption while maintaining stable luminance perception by avoiding uniform low-frequency driving that causes flicker.
Solution Approach 2:
The patent segments the scan lines into at least two groups (first scan lines and second scan lines) that are driven at different frequencies. This segmentation enables different portions of the display to be updated at different rates, allowing power savings in less critical areas while maintaining flicker-free operation in visible regions.
2Device complexity
If the display device uses a single scan frequency for all scan lines, then the driving control is simple, but flicker occurrence cannot be effectively quantified or reduced
Solution Approach 1:
The patent introduces multiple scan frequencies (f1 and f2) for different scan line groups, transforming the single-frequency driving mode into a multi-frequency mode. This parameter change enables flicker reduction while the processor automatically manages the complexity through standardized measurement and calculation procedures.
Solution Approach 2:
The patent implements a feedback mechanism where the processor measures luminance values at different time points, calculates luminance differences, and uses this information to determine flicker occurrence conditions. This feedback loop enables the system to adaptively manage the multi-frequency driving without requiring complex manual control.
3Measurement precision
If the display device sequentially displays images at multiple gray levels, then comprehensive display performance can be evaluated, but the measurement time and processing complexity increase
Solution Approach 1:
The patent performs preliminary actions by sequentially displaying images at different gray levels before conducting the actual flicker measurement. This preparation phase allows the system to collect necessary luminance data for multiple gray levels, which is then used to calculate flicker indices across the full display performance range.
Solution Approach 2:
The patent uses periodic action by sequentially displaying images at different gray levels in a systematic sequence. This periodic display pattern allows comprehensive evaluation of display performance across all gray levels while maintaining a structured approach that optimizes measurement efficiency.
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 system effectively quantifies flicker occurrence conditions, enabling improved power management and user experience by identifying optimal driving frequencies for reduced flicker and enhanced display performance.
Implementation Method 1
a luminance measurer configured to generate luminance data by measuring a luminance of a display surface of the display device
Implementation Method 2
a voltage measurer configured to measure a voltage of a photo sensor corresponding to light emitted from the display surface
Data Source
AI summary
A flicker quantification system includes a display device driven in units of reference periods having a first frame for writing data and at least one second frame for holding data. A luminance measurer generates luminance data by measuring a luminance of a display during the reference period. A voltage measurer measures a voltage of a photo sensor corresponding to light emitted. First voltage data representing an accumulation amount of voltage during the first frame and second voltage data representing an accumulation amount of voltage during the at least one second frame is generated. A processor calculates a flicker index value representing a ratio of a measured luminance difference to a just noticeable difference, based on the luminance data, the first voltage data, and the second voltage data. The measured luminance difference may represent the difference between a luminance during the first frame and a luminance during the second frame.