OLED Pixel Circuit with Dynamic Refresh for Power Management
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Solution Overview
Problem
Existing OLED display technologies face challenges in achieving high-frequency refreshing while maintaining low power consumption, particularly in Always On Display modes where frequent data refresh is not necessary.
Innovation Solution
The proposed pixel circuit includes a drive sub-circuit, write sub-circuit, compensation sub-circuit, first and second reset sub-circuits, and light-emitting control sub-circuits, which allow for dynamic frequency refreshing and efficient power management by periodically resetting the anode terminal of the light-emitting element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high-frequency refreshing is implemented in OLED display, then image quality and response speed are improved, but power consumption increases
Solution Approach 1:
The patent implements different refreshing frequencies for different regions of the display screen. The first region (e.g., status bar area) refreshes at a higher frequency while the second region (main content area) refreshes at a lower frequency. This periodic action with varying frequencies allows the display to maintain image quality where needed while reducing overall power consumption by not refreshing all pixels at maximum frequency continuously.
2Duration of action of moving object
If Always On Display mode is activated, then display availability is improved, but power consumption increases
Solution Approach 1:
The patent dynamically adjusts the refreshing frequency of different display regions based on their importance and content type. Critical information in the first region maintains high-frequency refreshing for immediate visibility, while less critical content in the second region uses lower-frequency refreshing. This dynamic adaptation allows the display to remain available and functional while optimizing power consumption based on actual display needs rather than uniform high-frequency operation.
3Illumination intensity
If uniform high-frequency refreshing is applied to entire display, then image quality is improved, but power consumption and processing load increase
Solution Approach 1:
The patent applies different refreshing frequencies to different spatial regions of the display based on local requirements. The first region (e.g., top status bar) receives high-frequency refreshing to maintain crisp, clear imagery for important information, while the second region (main display area) uses lower-frequency refreshing. This local differentiation ensures image quality is maintained where it matters most while reducing overall power consumption by not applying uniform high-frequency refreshing across the entire display surface.
Data Source
AI summary
A pixel circuit includes a drive sub-circuit, a write sub-circuit, a compensation sub-circuit, a first reset sub-circuit, a second reset sub-circuit and a light-emitting element. The drive sub-circuit is configured to provide a drive signal to a third node in response to signals of the first node and the second node; the write sub-circuit is configured to write the signal of the data signal line to the second node or the third node under a control of a signal of a first scanning signal line; the compensation sub-circuit is configured to compensate a voltage at the first node under the control of the signal of the first scanning signal line.