Double Rate Driving Display Driver Low Power Mode
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Solution Overview
Problem
Display systems using the double rate driving (DRD) method face challenges in reducing electromagnetic interference (EMI) and power consumption, particularly when driving a display panel with a shared data line configuration, as they require complex latch structures and high-frequency operations to manage display data distribution efficiently.
Innovation Solution
A driving apparatus with a latch structure that operates in a low power mode, using a timing controller to provide data packets and lock signals, allowing drivers to restore and latch display data in a time division manner, thereby reducing EMI and power consumption by bypassing unnecessary operations and optimizing data distribution across shared data lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the driver operates at high frequency to implement high resolution, then the display quality is improved, but power consumption increases
Solution Approach 1:
The driver alternates between normal operation mode and low power mode in periodic cycles. During low power mode, the driver maintains display output by repeating previous horizontal data when identical patterns are detected, reducing operational frequency while preserving display quality for static content.
Solution Approach 2:
The driver dynamically adjusts its operation mode based on content analysis. By detecting whether the displayed content is static or moving, the driver transitions between high-frequency normal mode and low-frequency low power mode, optimizing the balance between display quality and power consumption.
2Reliability
If the driver restores and latches horizontal data in each horizontal cycle, then the display data distribution is accurate, but power consumption increases
Solution Approach 1:
The driver performs complete data restoration and latching operations periodically during normal mode, while during low power mode it relies on previously latched data from the latch structure, reducing the frequency of these power-intensive operations while maintaining data accuracy through the time-division multiplexing architecture.
3Adaptability or versatility
If the driver operates in normal mode continuously, then the display can show moving images, but power consumption increases
Solution Approach 1:
The driver dynamically switches between normal mode and low power mode based on the temporal characteristics of the display content. For static images, it transitions to low power mode to reduce consumption, while automatically returning to normal mode when motion is detected, thus adapting display capability to content requirements.
Solution Approach 2:
The driver incorporates a pattern comparison mechanism that analyzes consecutive horizontal data to detect changes. This feedback system triggers mode transitions: when no changes are detected, the driver enters low power mode; when changes are detected, it returns to normal mode, ensuring appropriate display capability while minimizing power consumption.
Data Source
AI summary
Disclosed is a system for a display, which drives pixels using a double rate driving (DRD) method. The system includes a timing controller configured to provide a data packet and a lock signal, and a plurality of drivers each configured to restore display data and a clock of the data packet and output a source signal corresponding to the display data using the clock. The lock signal is fed back to the timing controller via the plurality of drivers. Each of the drivers outputs an internal lock signal, obtained by updating the lock signal with information on a restored clock, in next order. Each of the drivers may operate in a low power mode.