Display Control Device for Flicker Suppression in Variable Frame Periods
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Solution Overview
Problem
Conventional techniques for controlling display flicker are ineffective when frame periods vary in length, as they assume fixed frame periods, leading to visible flicker due to longer subframe and extinction periods, which are easily recognizable by the human eye.
Innovation Solution
A control method that dynamically adjusts the number of subframe periods to reconfigure the frame period, regardless of input frame period length, ensuring that the frame period is divided into n subframe periods where n is greater than or equal to 2, and adjusts the emission and extinction periods to maintain a consistent duty ratio, even if frame periods are variable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the frame period is extended to accommodate variable frame rates, then the adaptability to different GPU performance levels is improved, but the subframe and extinction periods become longer causing visible flicker
Solution Approach 1:
The patent divides the frame period into multiple subframes (e.g., 4 subframes per frame period). By segmenting the display refresh into multiple smaller time intervals, each subframe maintains a consistent duty ratio that prevents flicker, even when the overall frame period varies in length to accommodate different GPU performance levels.
Solution Approach 2:
The patent dynamically adjusts the number of subframes within a frame period based on the actual frame timing. When frame periods vary, the system flexibly modifies the subframe structure to maintain consistent subframe durations and duty ratios, preventing flicker while adapting to variable refresh rates.
2Object-affected harmful factors
If the number of subframes is increased to maintain consistent duty ratios, then flicker suppression is improved, but the device complexity increases
Solution Approach 1:
The patent implements a subframe structure where each frame period is divided into multiple equal-duration subframes. This segmentation approach systematically distributes the extinction period across multiple subframes, maintaining consistent duty ratios without requiring complex real-time adjustments to individual subframe parameters.
Solution Approach 2:
The patent employs periodic extinction cycles within each subframe, where the extinction period occurs at regular intervals in every subframe. This periodic structure creates a consistent rhythm that suppresses flicker while using simple, repeatable control patterns rather than complex variable timing.
Data Source
AI summary
A control method is provided for suppressing a flicker phenomenon even if frame periods vary in length. The control method controls an emission period and an extinction period of a frame period, which is a period in which one image continues to be displayed. When a signal indicating start of a frame period is detected, as the frame period, n subframe periods that configure the frame period, where n is an integer greater than or equal to 2, are sequentially started from the first subframe period, after a predetermined period of time has elapsed since the detection of the signal. All of the n subframe periods are controlled to have a substantially same length determined in advance and to have a substantially same ratio between the emission period and the extinction period, determined in advance, the ratio being referred to as a duty ratio.