OLED Driving Circuit for Partial Refresh Power Reduction
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Solution Overview
Problem
In OLED displays, especially in AOD or static screens, the frequent refresh of pixel circuits that do not need to update their pixel voltage leads to unnecessary power consumption due to the use of low-leakage LTPO TFTs.
Innovation Solution
A driving circuit with a driving signal generating circuit, control circuits, and output circuits that selectively control the writing of signals to pixel circuits based on gating and NAND operations, reducing unnecessary refresh and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all pixel circuits are refreshed every frame time, then display quality is maintained, but power consumption increases unnecessarily
Solution Approach 1:
The patent divides the pixel circuits into multiple groups based on their update requirements. Different pixel groups are selectively refreshed based on whether they need updates, allowing the display to maintain quality where needed while reducing power consumption in static regions. This segmentation enables partial screen refreshes instead of full screen refreshes.
Solution Approach 2:
The patent applies different refresh strategies to different regions of the display. Areas with changing content receive full refresh, while static areas maintain their content without refresh. This local differentiation optimizes the balance between display quality and power consumption by treating different parts of the screen according to their specific requirements.
2Use of energy by moving object
If partial pixel circuits are updated, then power consumption is reduced, but display quality may deteriorate
Solution Approach 1:
The patent dynamically determines which pixel circuits need updating based on real-time display content and user interaction. The system adapts the refresh pattern from static to dynamic based on actual usage scenarios, ensuring that power is not wasted on unnecessary updates while maintaining quality when changes are detected. This dynamic approach resolves the contradiction by making refresh decisions intelligent rather than fixed.
Solution Approach 2:
The patent incorporates feedback mechanisms to monitor display content changes and user interaction patterns. This feedback information is used to adjust the refresh strategy, ensuring that partial updates are applied only when necessary to maintain perceived display quality. The feedback loop allows the system to learn user behavior patterns and optimize refresh decisions accordingly.
3Use of energy by moving object
If LTPO TFTs with low leakage are used, then power consumption is reduced, but the penalty for repeated refresh increases
Solution Approach 1:
The patent implements periodic refresh only for pixel circuits that actually need updates, rather than continuous periodic refresh for all pixels. The refresh period is dynamically adjusted based on content changes and usage patterns, allowing the system to leverage the low-leakage特性 of LTPO TFTs while avoiding unnecessary periodic operations that would waste energy.
Solution Approach 2:
The patent changes the refresh rate parameter dynamically based on display content and user interaction. By adjusting the refresh period from fixed to variable, the system optimizes the balance between maintaining display quality and minimizing energy waste. This parameter adaptation allows LTPO TFTs to achieve their low-power potential while avoiding the energy penalty of redundant refresh operations.
Data Source
AI summary
A driving circuit, a driving method and a display device are provided. The driving circuit includes a driving signal generating circuit, M output driving terminals and M control circuits; the m-th control circuit includes an m-th gating circuit, an m-th output control circuit and an m-th output circuit; the driving signal generating circuit outputs an N-th level driving signal; the m-th gating circuit controls the writing of the m-th gating input signal into the m-th first node under the control of the m-th gating control signal; the m-th output control circuit performs a non-AND operation on the potential of the N-th level driving signal and the second terminal of the m-th output control circuit to obtain the m-th first output signal; the m-th output circuit inverts the m-th first output signal to obtain the m-th output driving signal.