Optical Measurement Device for Display Flicker Analysis
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Solution Overview
Problem
Conventional optical measurement devices face challenges in accurately measuring the luminance and flicker of display devices, particularly when driven at low speeds, leading to perceived luminance decrease and charge delay, which affects visual perception.
Innovation Solution
An optical measurement device that learns frequency characteristics from a display panel and display driver by analyzing optical waveforms, using a learner to convert waveforms into frequency domains, apply weighted filters, and generate filters to calculate optical and flicker indices, allowing for the measurement of frequency characteristics from both display panels driven by drivers and lighting devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a display device is driven at a low speed to reduce power consumption, then power consumption is reduced, but luminance decreases and flicker is generated causing deterioration of visual perception
Solution Approach 1:
The patent applies dynamics by making the refresh period variable rather than fixed. The display device dynamically adjusts the refresh period based on the grayscale value of the displayed image - using longer refresh periods for static or slowly changing images to save power, and shorter refresh periods for rapidly changing images to maintain visual quality. This dynamic adaptation resolves the contradiction between power consumption and visual perception quality.
Solution Approach 2:
The patent changes the parameter of refresh period based on image characteristics. By analyzing the grayscale values and temporal changes of displayed images, the system adjusts the refresh period parameter to optimize both power consumption and visual perception. This parameter change strategy allows the display to operate at low power consumption while maintaining acceptable visual quality through adaptive refresh timing.
2Use of energy by moving object
If the period of refresh periods is increased to reduce power consumption, then power consumption is reduced, but a time interval between adjacent refresh periods increases causing perceived luminance decrease
Solution Approach 1:
The refresh period is dynamically adjusted based on image characteristics rather than being fixed. When images are static or change slowly, longer refresh periods are used to save power. When images change rapidly, shorter refresh periods maintain luminance. This dynamic adjustment resolves the contradiction between power consumption and luminance maintenance.
Solution Approach 2:
The system changes the refresh period parameter according to the temporal and spatial characteristics of displayed images. By monitoring grayscale value changes and adjusting the refresh period accordingly, the system optimizes the balance between power consumption and perceived luminance, ensuring acceptable visual quality while reducing power usage.
3Adaptability or versatility
If conventional optical measurement devices measure luminance of display panels driven at low speed, then measurement capability is maintained, but measurement accuracy deteriorates due to flicker and luminance decrease
Solution Approach 1:
The measurement device performs preliminary learning to acquire frequency characteristics of the display panel and driver before actual measurement. By pre-acquiring the transfer function and frequency response through learning mode, the device can then accurately measure luminance and flicker in evaluation mode even when the display is driven at low speeds with flicker. This preliminary action enables accurate measurement despite the challenging driving conditions.
Solution Approach 2:
The system uses feedback from the learned frequency characteristics to compensate for measurement errors. By continuously learning the display's frequency response and using this information to correct measurements, the system maintains high measurement accuracy across different driving conditions including low-speed operation with flicker.
Data Source
AI summary
An optical measurement device includes an optical sensor which measures an optical waveform of a reference object or a measurement object, a learner which receives a first optical waveform of the reference object from the optical sensor and learns frequency characteristics of the first optical waveform, a filter generator which analyzes the frequency characteristics of the first optical waveform and generates a frequency filter, a frequency modeling unit which receives a second optical waveform of the measurement object from the optical sensor and models frequency characteristics of the second optical waveform, and an optical characteristic detector which calculates an optical characteristic index of the second optical waveform based on an output value of the frequency modeling unit and the frequency filter.