Backlight Control via Display Sync Signal for LCD
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Solution Overview
Problem
Conventional LCD display backlight control methods require additional circuits and consume excessive power due to the need for detecting dynamic vs. static frames, leading to increased CPU and data bus loading and poor display quality for high dynamic range images.
Innovation Solution
A method and apparatus for backlight control that utilizes a signal receiving circuit to generate a backlight control signal from a display synchronization signal, driving the backlight source between full-light and full-dark states through a frequency-dividing operation, reducing the need for additional detection circuits and minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional detecting circuits and memories are used to determine dynamic vs. static frames, then display quality can be improved, but device complexity and power consumption increase
Solution Approach 1:
The patent extracts the frame type detection function from the main processing system by utilizing the display synchronization signal that already exists in the system. Instead of adding complex detecting circuits and memories, the invention uses the existing synchronization signal's characteristics (continuous for static frames, intermittent for dynamic frames) to determine frame type, thereby avoiding increased device complexity while maintaining display quality.
Solution Approach 2:
The display synchronization signal serves dual purposes: it both synchronizes the display timing and provides frame type detection information. The signal's inherent characteristics (continuous vs. intermittent) automatically indicate whether frames are static or dynamic, eliminating the need for separate detection circuits and making the system self-sufficient.
2Measurement precision
If additional detecting circuits and data buses are added to determine frame types, then display control accuracy improves, but power consumption increases
Solution Approach 1:
The display synchronization signal performs multiple functions simultaneously: it provides timing synchronization for display refresh and carries frame type information through its continuity characteristics. This multi-functionality eliminates the need for separate detection circuits and data buses, reducing power consumption while maintaining accurate frame type detection.
Solution Approach 2:
The synchronization signal automatically provides frame type detection information through its inherent characteristics without requiring additional processing power. Static frames produce continuous signals while dynamic frames produce intermittent signals, allowing the system to detect frame types using minimal energy.
3Reliability
If flashing backlight control is implemented for dynamic frames, then motion display quality improves, but CPU loading and data bus traffic increase
Solution Approach 1:
The patent extracts the frame type detection logic from the CPU by using the display synchronization signal's characteristics. The CPU no longer needs to actively compare frame signals or determine frame types, as this information is readily available in the synchronization signal itself, thereby reducing CPU loading while maintaining motion display quality through selective backlight control.
Data Source
AI summary
A method for backlight control includes: receiving a display synchronization signal; generating a backlight control signal according to the display synchronization signal; and driving a backlight source according to the backlight control signal. An apparatus for backlight control includes: a signal receiving circuit, for receiving a display synchronization signal; a control circuit, coupled to the signal receiving circuit, for generating a backlight control signal according to the display synchronization signal; and a driving circuit, coupled to the control circuit, for driving a backlight source according to the backlight control signal.