Gate Driving Circuit Gating for Partial OLED Screen Refresh
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Solution Overview
Problem
In OLED displays, especially for Always On Display (AOD) images, most pixel circuits do not need to update pixel voltages, leading to unnecessary power consumption due to repeated flashing.
Innovation Solution
A driving circuit with a gating circuit that controls the writing of gating input signals to specific nodes, allowing partial screen updates to reduce power consumption by controlling the update of pixel circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If all pixel circuits are updated with pixel voltages in every frame, then the display can show dynamic images, but power consumption increases unnecessarily for static images like AOD
Solution Approach 1:
The patent segments the display screen into multiple regions (first display region and second display region) with different refresh rates. The first display region updates at a lower refresh rate while the second display region updates at a higher refresh rate, allowing selective updating of different screen portions based on content requirements. This segmentation enables power savings for static content while maintaining high refresh rates for dynamic content regions.
Solution Approach 2:
The patent implements partial screen updating by selectively refreshing only certain regions of the display rather than the entire screen. For AOD mode, only specific regions requiring updates are refreshed while other regions maintain their current state, reducing overall power consumption while preserving necessary display functionality.
2Illumination intensity
If the entire screen is refreshed at high frequency, then dynamic image quality is maintained, but power consumption increases for static displays
Solution Approach 1:
The patent applies different quality standards to different regions of the display. The first display region operates with lower refresh rate requirements suitable for static content, while the second display region maintains higher refresh rates for dynamic content. This local differentiation optimizes power consumption while maintaining appropriate display quality for each region's content type.
Solution Approach 2:
The patent implements dynamic refresh rate adjustment where the display can switch between different refresh rate modes based on content requirements and display mode (e.g., AOD mode versus full display mode). The system dynamically adapts the refresh rate of different regions according to whether the content is static or dynamic, optimizing both power consumption and display quality.
Data Source
AI summary
A driving circuit includes a driving signal generation circuit, a gating circuit, an output control circuit, an output circuit and a voltage control circuit; the driving signal generation circuit generates an Nth stage of driving signal, the output control circuit connects the first control node and the second node under the control of the potential of the first node; the gating circuit controls to write a gating input signal into the first node under the control of a gating control signal; the voltage control circuit controls a potential of the second node according to a potential of the first node; the output circuit connects the output driving terminal and the first voltage terminal under the control of the potential of the second node, and connects the output driving terminal and the second voltage terminal under the control of the potential of the third control node.