Display Flicker Suppression via Dynamic Grayscale and Refresh Rate Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal display panels with oxide semiconductor TFTs face challenges in reducing power consumption while maintaining display quality, as lowering the refresh rate to achieve lower power consumption leads to flicker recognition and non-uniform pixel capacitances, and increasing the refresh rate for high image quality results in higher power consumption.
Innovation Solution
A control device that determines if an image is flickering and adjusts the grayscale level of recognizable flicker pixels by increasing or lowering their grayscale levels, and adjusts backlight luminance to prevent flicker recognition, allowing for lower refresh rates and reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the refresh rate is lowered to reduce power consumption, then power consumption is reduced, but flicker becomes easily recognizable and display quality deteriorates
Solution Approach 1:
The patent dynamically adjusts the refresh rate based on image characteristics. When the image determining section detects that an image is not likely to cause flicker (e.g., still images or images with specific patterns), the refresh rate is lowered to reduce power consumption. When flicker-prone images are detected, the refresh rate is maintained at higher levels to ensure display quality. This dynamic adaptation resolves the contradiction by making the refresh rate flexible rather than fixed.
Solution Approach 2:
The patent changes the refresh rate parameter based on image analysis results. The control device analyzes image characteristics and adjusts the refresh rate parameter accordingly - lowering it for safe images and maintaining it for flicker-prone images. This parameter change strategy allows the system to optimize power consumption while maintaining display quality when necessary.
2Reliability
If the refresh rate is increased to maintain display quality, then display quality is maintained, but power consumption increases
Solution Approach 1:
The system dynamically adjusts the refresh rate based on real-time image analysis. Instead of maintaining a high refresh rate continuously, the system lowers the refresh rate when images are determined to be safe from causing flicker, thereby reducing power consumption while maintaining display quality when it matters most.
Solution Approach 2:
The patent applies partial action by selectively maintaining high refresh rates only for specific images that are likely to cause flicker, while using lower refresh rates for other images. This partial application of high refresh rate minimizes power consumption while still preventing flicker issues where they would occur.
3Object-affected harmful factors
If grayscale levels are adjusted to suppress flicker, then flicker recognition is reduced, but image brightness and visual quality may be affected
Solution Approach 1:
The patent adjusts grayscale levels as a parameter to suppress flicker while minimizing impact on image brightness. By carefully controlling the magnitude and direction of grayscale adjustments, the system reduces flicker recognition while maintaining acceptable visual quality and brightness perception.
Data Source
AI summary
In order to attain an object to provide a display device capable of suppressing electric power consumption as well as displaying an image with excellent quality, a control device includes a control information output section (36) for, in a case where an image determining section (35) determines that an image is a flickering image, supplying, to a grayscale level control section (80), grayscale level control information for causing the grayscale level control section to carry out control for increasing or lowering a grayscale level of a pixel in which flicker is easily recognizable.