OLED Driving Circuit for Selective Pixel Voltage Updating
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Solution Overview
Problem
In OLED displays, especially for Always On Display (AOD) images, most pixel circuits do not require voltage updates, leading to unnecessary power consumption due to repeated flashing, which is inefficient.
Innovation Solution
A driving circuit with a gating circuit, output control circuit, voltage control circuit, and output circuit that selectively controls the updating of pixel voltages based on gating input signals, reducing power consumption by partially updating the display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If all pixel circuits are updated with pixel voltages in every frame, then the display can maintain image accuracy, but power consumption increases unnecessarily for static images
Solution Approach 1:
The patent divides the pixel circuit update process into two segments: updated pixels and non-updated pixels. The gating circuit selectively activates only the pixels that require voltage updates while keeping other pixels in a low-power state, thereby segmenting the power consumption across different pixel regions based on their update needs.
Solution Approach 2:
Instead of updating all pixels in every frame, the patent implements partial action by updating only the necessary pixels. The gating control signal enables selective activation of pixel circuits, performing exactly the required updates without excessive full-screen refreshing, thus reducing power consumption while maintaining image accuracy where needed.
2Stability of the object's composition
If pixel circuits are repeatedly flashed to maintain display brightness, then display stability is maintained, but power consumption increases
Solution Approach 1:
The patent implements periodic action by updating pixel voltages only at specific intervals rather than continuously in every frame. The gating control signal determines when updates occur, allowing the display to maintain stability through selective periodic refreshing rather than continuous operation, thereby reducing energy loss.
Solution Approach 2:
The patent extracts the unnecessary repeated flashing operation from the pixel circuits that don't require updates. By removing the redundant voltage writing operations for stable pixels through the gating mechanism, the system maintains display stability while eliminating the associated energy consumption.
3Measurement precision
If the entire screen is updated for AOD images, then image quality is maintained, but power consumption is wasted on pixels that don't need updating
Solution Approach 1:
The patent applies local quality by differentiating the operational state of different pixel regions. Some pixels receive full update operations to maintain high image quality, while other pixels operate in a low-power mode. The gating circuit enables this localized differentiation, allowing the system to optimize image quality where necessary while conserving energy in regions where it is not needed.
Data Source
AI summary
A driving circuit includes a driving signal generation circuit, a gating circuit, an output control circuit, a voltage control circuit and an output circuit; the driving signal generation circuit generates the Nth stage of driving signal; the gating circuit writes a gating input signal into the first node under the control of a gating control signal; the output control circuit connects the first control node and the second node under the control of a potential of the first node; the voltage control circuit controls a potential of the second node according to the 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 second control node; N is a positive integer.