AOD Display Driving Circuit for Static-Screen Power Reduction
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Solution Overview
Problem
In OLED displays, especially in AOD screens or static screens, the repeated refresh of pixel circuits that do not require voltage updates leads to unnecessary power consumption due to the use of low-leakage low-temperature polycrystalline oxide (LTPO) thin-film transistors.
Innovation Solution
A driving circuit with a first driving signal generation circuit, a first output control circuit, a first gating circuit, a first energy storage circuit, and a first output circuit, which control the connection and potential of nodes and terminals to optimize the writing and refreshing of pixel circuits, reducing unnecessary refresh cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all pixel circuits are refreshed repeatedly within one frame time, then the pixel voltage can be maintained and display stability is ensured, but power consumption increases due to unnecessary refresh cycles in AOD and static screens
Solution Approach 1:
The patent segments the pixel circuits into two categories: first pixel circuits that require voltage updates and second pixel circuits that maintain original voltage. This segmentation allows selective refreshing, where only the first pixel circuits undergo the initialization and writing processes, while the second pixel circuits skip these steps and maintain their current state through the pixel maintenance transistor. This resolves the contradiction by maintaining display stability for updated regions while eliminating unnecessary power consumption in static regions.
Solution Approach 2:
The patent implements dynamic control of the pixel maintenance transistor's gate electrode voltage based on the pixel circuit's state. When a pixel circuit does not require updating, the gate electrode voltage is adjusted to maintain the pixel voltage without full refresh cycles. This dynamic adjustment allows the system to adapt between full refresh modes (for stability) and partial refresh modes (for power savings), resolving the contradiction between reliability and energy consumption.
2Loss of energy
If LTPO thin-film transistor is used to maintain pixel voltage, then leakage is reduced and power consumption is lowered, but repeated refresh cycles still cause unnecessary power waste in pixel circuits that do not need updates
Solution Approach 1:
The patent extracts the initialization and writing steps from the standard pixel refresh process, applying them only to pixel circuits that require updates. For pixel circuits that do not need updates, these steps are completely removed, and only the pixel maintenance function remains active. This extraction eliminates the unnecessary power consumption associated with repeated initialization and writing operations while preserving the leakage reduction benefits of LTPO transistors.
Solution Approach 2:
The patent applies partial action by performing only the necessary portion of the refresh process. Instead of completing the full initialization and writing sequence for all pixel circuits, the system performs these actions only for pixel circuits that require updates. For other pixel circuits, the system applies minimal maintenance actions through the pixel maintenance transistor, achieving power savings while maintaining adequate display performance.
Data Source
AI summary
A driving circuit includes a first driving signal generation circuit, a first output control circuit, a first gating circuit, a first first energy storage circuit, a first second energy storage circuit and a first output circuit; N is a positive integer; the first gating circuit controls to write the gating input signal into the first first node under the control of the gating control signal; the first output circuit controls to connect the Nth stage of output driving terminal and the first voltage terminal under the control of the potential of the first second node, and controls to connect the Nth stage of output driving terminal and the second voltage terminal under the control of the potential of the first third control node; the first third control node and the first second control node are different nodes.