Display Device Refresh Rate Control for Transient Flashing
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Solution Overview
Problem
Display devices experience visibility issues due to transient flashing phenomena when the image refresh rate is changed, causing perceived luminance to instantaneously increase and leading to flickering, which deteriorates visibility.
Innovation Solution
A display device that includes an optical sensor to measure the optical waveform, an image controller to detect optical characteristic information, and a refresh rate controller that compares the flashing luminance with a threshold value to adjust the refresh rate, either gradually changing it or immediately switching between refresh rates based on the comparison result.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If the image refresh rate is changed to improve driving efficiency and minimize power consumption, then power consumption is reduced, but transient flashing occurs causing visibility deterioration
Solution Approach 1:
The patent applies preliminary action by measuring the optical waveform before changing the refresh rate and predicting the flashing luminance in advance. The image controller calculates whether transient flashing will occur based on the current optical characteristics, and only proceeds with refresh rate changes when safe, thus preventing visibility deterioration before it happens.
Solution Approach 2:
The patent implements feedback by continuously measuring the optical waveform of the display panel and using this information to dynamically adjust refresh rate changes. The optical sensor provides real-time feedback about the display's luminance state, allowing the controller to make informed decisions about when to change refresh rates without causing flashing.
2Speed
If the refresh rate is changed immediately to improve response time, then response time is reduced, but flickering increases causing visibility issues
Solution Approach 1:
The patent uses preliminary action by calculating the flashing luminance and comparing it with a threshold value before executing the refresh rate change. This prediction mechanism allows the system to prepare safe refresh rate transitions in advance, achieving fast response without causing visible flickering.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the refresh rate based on the measured optical waveform characteristics. Instead of fixed refresh rate changes, the system modifies the refresh rate parameter adaptively according to the current display state, preventing flickering while maintaining fast response.
3Object-affected harmful factors
If optical waveform measurement and dynamic refresh rate control are implemented to prevent flashing, then visibility is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by integrating the optical sensor and image controller functions into existing display system components. The optical sensor can be shared with other display calibration functions, and the image controller performs both image processing and refresh rate management, reducing the need for separate dedicated components.
Solution Approach 2:
The patent implements self-service by having the display system measure and control its own optical characteristics. The optical sensor monitors the display panel's own output, and the image controller autonomously adjusts refresh rates based on self-measured data, eliminating the need for external monitoring equipment or complex additional control systems.
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
Prevents transient flashing and improves visibility by dynamically controlling the refresh rate based on the detected flashing luminance, ensuring a smooth transition and minimizing flickering effects.
Implementation Method 1
an optical sensor measuring an optical waveform of the display panel
Data Source
AI summary
Provided is a display device including a display panel, an optical sensor, a timing controller, a scan driver, a data driver, and an image controller. The timing controller controls an image refresh rate of the display panel based on are fresh rate control signal. Thus, the display device provides improved visibility.