Backlight Voltage Control for Rapid TV Brightness Adjustment
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Solution Overview
Problem
The existing methods for adjusting backlight driving voltage in liquid crystal TV sets have a low response speed, causing the backlight to become brighter or darker slowly, which degrades the visual effect due to the inability of the DC/DC converter to rapidly adjust the voltage from lower to higher levels.
Innovation Solution
The method involves comparing the backlight driving current with the reference driving current to obtain voltage feedback data, making overvoltage adjustments to generate overvoltage feedback data, and using this data to adjust the backlight driving voltage, allowing for rapid adjustment from lower to higher voltage levels, thereby improving the response speed of the backlight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional feedback control is used to adjust backlight driving voltage, then the system can maintain stable operation, but the response speed is slow causing the backlight to change brightness gradually
Solution Approach 1:
The patent applies preliminary action by pre-storing multiple voltage feedback data corresponding to different brightness levels in a lookup table. When brightness adjustment is needed, the system directly retrieves the appropriate pre-calculated voltage feedback data rather than computing it in real-time through slow iterative feedback, enabling rapid brightness transition while maintaining stability
Solution Approach 2:
The patent changes the control parameter from continuous real-time voltage adjustment to discrete pre-calculated voltage levels. By storing voltage feedback data for specific brightness levels and selecting from these pre-defined values, the system achieves fast response speed while maintaining the stability of traditional feedback control
2Productivity
If DC/DC converter rapidly adjusts voltage from lower to higher levels, then the backlight response speed improves, but the system complexity increases
Solution Approach 1:
The system performs preliminary computation of voltage feedback data for various brightness levels and stores it in advance. This pre-processing eliminates the need for complex real-time calculations during actual brightness adjustment, reducing control complexity while maintaining high adjustment speed
Solution Approach 2:
The patent creates a lookup table that copies and stores pre-calculated voltage feedback data for different brightness levels. Instead of computing voltage feedback in real-time, the system simply retrieves the appropriate copied data from the table, significantly simplifying the control process while enabling rapid voltage adjustment
Data Source
AI summary
This disclosure relates to a liquid crystal TV set, and a method and apparatus for adjusting backlight driving voltage thereof, and the method for adjusting backlight driving voltage includes: comparing backlight driving current with reference driving current to obtain voltage feedback data, while a backlight source is being driven; making overvoltage adjustment to the voltage feedback data to generate overvoltage feedback data; and adjusting backlight driving voltage using the overvoltage feedback data to overvoltage-drive the backlight source by the adjusted backlight driving voltage. The liquid crystal TV set, and the method and apparatus for adjusting backlight driving voltage thereof according to this disclosure can improve the response speed of backlight in the liquid crystal TV set while the backlight source is being driven.