Adaptive Refresh Block for Display Flicker Reduction
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Solution Overview
Problem
Display devices employing adaptive refresh techniques experience flicker issues due to low frequency driving, especially when the input frequency of image data dynamically changes, leading to increased power consumption and reduced battery life in portable devices.
Innovation Solution
A display device with an adaptive refresh block that determines a target frequency and calculates a masking ratio based on input frequency information, selectively masking and outputting image data to adjust the refresh frequency, thereby preventing flicker and optimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If adaptive refresh technique is used to reduce power consumption, then power consumption is reduced, but flicker occurs due to low frequency driving
Solution Approach 1:
The patent implements dynamic frequency adjustment by continuously monitoring image characteristics (still vs. moving images) and adapting the refresh frequency accordingly. The display device transitions from fixed frequency to variable frequency operation, selecting between high refresh mode for moving images and low refresh mode for still images, thereby optimizing power consumption while maintaining image quality.
Solution Approach 2:
The patent changes the refresh frequency parameter based on image content analysis. By detecting whether the input image is a still image or moving image, the system adjusts the refresh frequency parameter dynamically - using lower frequencies for still images to reduce power consumption and higher frequencies for moving images to prevent flicker and maintain visual quality.
2Adaptability or versatility
If input frequency is dynamically changed, then adaptability is improved, but flicker is intensified due to excessive decrease of driving frequency
Solution Approach 1:
The patent employs feedback mechanisms by monitoring image characteristics and using this information to adjust refresh frequency. The system continuously analyzes whether images are static or dynamic and feeds this information back to the frequency control logic, ensuring that frequency adjustments are based on actual display needs rather than predetermined settings.
Solution Approach 2:
The system implements dynamic frequency selection that adapts to changing image content. Rather than using a fixed or purely input-driven frequency, the display dynamically adjusts its operating frequency based on real-time analysis of image characteristics, allowing it to respond appropriately to different display scenarios.
3Use of energy by moving object
If refresh frequency is reduced for power saving, then power consumption is reduced, but image stability deteriorates due to flicker
Solution Approach 1:
The patent changes the refresh frequency parameter conditionally based on image content. For still images, the system uses lower refresh frequencies to conserve power, while for moving images, it switches to higher frequencies to maintain image stability and prevent flicker. This conditional parameter adjustment resolves the contradiction between power saving and image stability.
Solution Approach 2:
The patent applies different refresh frequency qualities to different types of image content. Instead of using a uniform frequency for all images, the system tailors the refresh frequency to the specific characteristics of the displayed content - using optimized low frequencies for still images where stability is less critical and higher frequencies for moving images where stability is paramount.
Data Source
AI summary
A display device includes display device includes: a display panel including a plurality of pixels; a data driver configured to generate data voltages based on output image data, and to provide the data voltages to the plurality of pixels; and a controller configured to receive input image data and input frequency information from a host processor, and to provide the output image data to the data driver, wherein the controller includes an adaptive refresh block configured to: determine a target frequency by analyzing the input image data; determine a masking ratio based on an input frequency represented by the input frequency information and the target frequency; and selectively output the input image data as the output image data by performing a masking operation on the input image data with the masking ratio.