OLED Multi-Refresh Control for Power Saving and Optical Consistency
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Solution Overview
Problem
Displays configured to operate at both high and low refresh rates face issues with inconsistent optical performance and compromised power savings due to attempts to maintain uniform optical performance across different refresh rates.
Innovation Solution
Implementing a display panel with a device driver that manages multiple refresh rates by performing image refresh operations once per frame period at or above a threshold rate and performing self-refresh operations at least once during the frame period at lower rates, while applying specific gamma correction values based on brightness and gray level conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the display operates at lower refresh rates to reduce power consumption, then battery life is improved, but optical performance becomes inconsistent
Solution Approach 1:
The display dynamically adjusts its refresh rate based on content characteristics and user interaction, transitioning between low refresh rates for static content (power saving) and high refresh rates for dynamic content (performance maintenance). The device driver continuously monitors and adapts the refresh rate, making the system flexible rather than static.
Solution Approach 2:
The patent changes the refresh rate parameter from a fixed value to a variable that can be adjusted between multiple discrete rates (e.g., 1Hz, 10Hz, 60Hz, 120Hz). By modifying this key parameter based on operational conditions, the display optimizes the trade-off between power consumption and optical performance.
2Reliability
If the display operates at higher refresh rates to improve graphical output, then visual performance is improved, but power consumption increases
Solution Approach 1:
The display applies high refresh rates selectively only when necessary for specific content types (e.g., video playback, gaming, scrolling content), while using low refresh rates for static content like images or idle screens. This partial application of high refresh rates minimizes overall power consumption while maintaining visual quality when needed.
Solution Approach 2:
The system dynamically transitions between different refresh rate levels based on real-time content analysis and user interaction detection, ensuring high graphical output quality is maintained only during periods when it provides actual value, rather than operating continuously at high refresh rates.
3Reliability
If self-refresh operations are performed frequently to maintain optical performance, then display quality is improved, but power savings are compromised
Solution Approach 1:
The display implements periodic self-refresh operations at strategically determined intervals rather than continuous refreshing. The device driver schedules self-refresh events based on the frame period and content characteristics, performing refreshes only when necessary to maintain optical performance while allowing longer intervals during which power is conserved.
Solution Approach 2:
The display performs self-refresh operations autonomously managed by the device driver without requiring continuous external intervention. The system monitors its own state and automatically initiates refresh operations when optical performance degradation is detected, enabling intelligent self-management of the trade-off between quality and power consumption.
4Reliability
If gamma correction is applied to maintain consistent brightness across refresh rates, then optical uniformity is improved, but processing complexity increases
Solution Approach 1:
The device driver adjusts gamma correction parameters dynamically based on the current refresh rate and content characteristics. By modifying gamma values in conjunction with refresh rate changes, the system maintains consistent perceived brightness and color accuracy across different operational modes without requiring complex real-time processing.
Solution Approach 2:
Gamma correction values are pre-calculated and stored for different refresh rate scenarios. The device driver selects the appropriate pre-computed gamma table based on the current operating conditions, avoiding the need for complex real-time gamma calculations and reducing processing complexity while maintaining brightness consistency.
Data Source
AI summary
Rendering images on an active area of an OLED includes rendering images on the active area of the display panel with a plurality of different frame rates. For a plurality of the different frame rates having a frame rate that matches or is above a threshold frame rate, an image refresh operation is performed once per frame period and a self-refresh operation is not performed during the frame period. When rendering images on the active area, for at least one of the different frame rates having a frame rate that is lower than the threshold frame rate, an image refresh operation is performed once per frame period and a self-refresh operation is performed at least once during the frame period.