Controller Synchronizes Multi-Panel Display Updates via TE Signal Comparison
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Solution Overview
Problem
Electronic devices with multiple display panels using the MIPI COMMAND mode face challenges in synchronizing screen updates due to differences in tearing effect signals, leading to frame overlap and frame drop phenomena, which complicates power consumption and control.
Innovation Solution
An electronic device with a controller that generates and compares tearing effect signals from multiple display panels, adjusting their clocks to synchronize screen updates, either using internal or external clock generators, to mitigate signal differences and ensure simultaneous updates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If an electronic device uses MIPI COMMAND mode to control multiple display panels, then power consumption is reduced compared to MIPI VIDEO mode, but screen update synchronization becomes difficult due to differences in TE signals between panels
Solution Approach 1:
The controller receives TE signals from each display panel as feedback about their current screen update status. By monitoring these feedback signals, the controller can determine when each panel has completed its current frame and coordinate subsequent frame updates accordingly, enabling synchronization in MIPI COMMAND mode while maintaining low power consumption
Solution Approach 2:
The controller transmits frame update request signals to display panels in advance, coordinating their update timing before actual screen updates occur. This preliminary coordination allows the system to synchronize multiple panels operating in MIPI COMMAND mode without requiring continuous high-power communication
2Adaptability or versatility
If each display panel uses its own internal clock generator, then each panel can operate independently, but TE signals occur at different times causing frame overlap and frame drop phenomena
Solution Approach 1:
The patent merges the clock synchronization function by having the controller receive TE signals from all display panels and coordinate their frame updates based on these signals. This combines the independent clock operations into a synchronized system, eliminating frame overlap and drop phenomena while preserving the benefits of independent panel operation
3Use of energy by moving object
If screen update is controlled only when required in MIPI COMMAND mode, then power consumption is reduced, but synchronization between multiple physically different display panels becomes difficult
Solution Approach 1:
The controller uses TE signals as feedback to precisely determine when each display panel completes its current frame. This feedback mechanism enables the controller to coordinate frame updates with high timing precision across multiple physically different panels while maintaining the power-efficient MIPI COMMAND mode operation
Data Source
AI summary
An electronic device is provided. The electronic device includes a first display panel including a first clock generator and that generates a first signal according to the first clock generator in response to a screen update request signal, a second display panel including a second clock generator and that generates a second signal according to the second clock generator in response to a screen update request signal, and a controller that transmits the screen update request signal to the first display panel and the second display panel and that receives the first signal and the second signal and that compares the first signal and the second signal to adjust a clock of at least one of the first clock generator and the second clock generator.