LCD Tearing Elimination via Dynamic Clock Synchronization
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Solution Overview
Problem
Conventional liquid crystal display (LCD) devices experience a tearing effect due to asynchronous write and scan clock signals, leading to inefficient image processing and increased complexity, especially in cost-sensitive electronic devices like mobile phones.
Innovation Solution
A method to synchronize the write and scan clock signals by detecting and adjusting the write time to match the scan time, eliminating the need for separate processors and reducing the tearing effect without interrupting other operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional controller is used without synchronization, then device complexity is reduced, but tearing effects occur in displayed images
Solution Approach 1:
The patent implements dynamic adjustment of the write clock signal timing based on real-time detection of scan clock signal timing. The controller dynamically synchronizes the write operation timing with the scan operation timing by adjusting the write clock signal's phase or period, ensuring that image data is written to the memory at the optimal moment when the display is not actively scanning, thereby preventing tearing effects while maintaining system simplicity
Solution Approach 2:
The patent employs a feedback mechanism where the controller detects the timing of the scan clock signal and uses this information to adjust the timing of the write clock signal. This closed-loop synchronization ensures that the write operation is always properly timed relative to the scan operation, eliminating tearing effects without requiring additional hardware components
2Reliability
If write time is increased to match scan time, then tearing effect is reduced, but image processing efficiency decreases
Solution Approach 1:
The patent dynamically adjusts the write clock signal timing to match the scan clock signal timing only when necessary to prevent tearing. The controller continuously monitors the relationship between write and scan operations and makes real-time adjustments to the write operation timing, ensuring synchronization is achieved without permanently extending the write time, thus maintaining processing efficiency while preventing display artifacts
Solution Approach 2:
The patent changes the timing parameters of the write clock signal dynamically based on the detected scan clock signal characteristics. By adjusting the phase, period, or duty cycle of the write clock signal rather than fixedly increasing write time, the system achieves synchronization to prevent tearing while minimizing the impact on image processing throughput and efficiency
Data Source
AI summary
Methods and related liquid crystal display devices are disclosed that reduce/avoid a tearing effect in displayed images. A scan time of a scan clock signal of a display is detected. A write time of a write clock signal that writes data into a memory for display on the display is detected. The write time is regulated in response to a comparison of the scan time of the scan clock signal to the write time of the write clock signal.