Backlight Driving Apparatus Single Power Terminal Dimming
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Solution Overview
Problem
Existing liquid crystal display backlight driving apparatuses require separate power terminals for burst dimming and analog dimming, leading to complex power supply and circuit configurations.
Innovation Solution
A backlight driving apparatus that receives a power voltage for burst dimming via one power terminal, using a burst dimming signal generator, an analog dimming voltage generator, and a main controller to generate a pulse width modulating signal with a duty ratio proportional to the burst dimming signal and amplitude proportional to the analog dimming voltage, simplifying the power supply process and circuit configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate power terminals are used for burst dimming and analog dimming, then the backlight driving apparatus can independently control both dimming functions, but the power supply and circuit configuration become complex
Solution Approach 1:
The patent combines two separate power terminals into one shared power terminal that supplies power to both the burst dimming signal generator and the analog dimming voltage generator. This merging reduces the number of power terminals from two to one, simplifying the power supply configuration while maintaining the ability to independently control both dimming functions through separate signal processing paths within the single terminal architecture.
Solution Approach 2:
The single power terminal is designed to serve multiple functions simultaneously - it provides power for both burst dimming operation and analog dimming operation. The terminal acts as a universal power source that can support both dimming modes, eliminating the need for dedicated separate terminals while maintaining full functionality of both control mechanisms.
2Device complexity
If one power terminal is used for both burst dimming and analog dimming, then the power supply configuration is simplified, but the control precision for both dimming functions may be compromised
Solution Approach 1:
The patent segments the control functions within the single power terminal architecture by creating separate signal processing paths - one path for generating the burst dimming signal and another path for generating the analog dimming voltage. This segmentation ensures that each dimming function receives dedicated control signals and processing, maintaining precise control despite the shared power terminal.
Solution Approach 2:
The patent introduces intermediary signal processing components within the backlight driving apparatus that mediate between the single power terminal and the two separate dimming functions. These intermediaries ensure that the power signal is properly distributed and controlled for both burst and analog dimming operations, preserving control precision through intermediate control stages.
Data Source
AI summary
An inverter of a liquid crystal display for receiving a power voltage for burst dimming via one power terminal to simultaneously adjust a burst dimming and an analog dimming is disclosed. In the inverter of the liquid crystal display, a burst dimming signal generator receives a triangular-wave signal and a power voltage for burst dimming to generate a burst dimming signal. An analog dimming voltage generator receives the power voltage for burst dimming to generate an analog dimming voltage. And a main controller receives the burst dimming signal and the analog dimming voltage to generate a pulse width modulating signal which is used for generating a driving current of a backlight assembly.