Backlight Duty Ratio Adjustment for Trailing Reduction
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Solution Overview
Problem
Existing liquid crystal display devices suffer from a trailing phenomenon due to the combination of liquid crystal response time and human visual persistence, which current methods like overvoltage driving and black frame insertion only partially alleviate.
Innovation Solution
A backlight driving method that independently drives luminous bodies in scanning areas by adjusting backlight duty ratios based on the gray scale of current and previous frames, ensuring black frame insertion time is sufficient to alleviate trailing effects, with specific ratios and timing adjustments to optimize display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If black frame insertion is used to alleviate trailing phenomenon, then visual persistence effect is reduced, but display brightness and luminance are compromised
Solution Approach 1:
The patent applies different backlight duty ratios to different scanning areas based on their specific gray scale characteristics. By locally optimizing the black frame insertion time for each scanning area rather than uniformly applying it to the entire display, the method reduces trailing phenomenon in specific regions while maintaining overall display brightness and luminance quality.
Solution Approach 2:
The backlight duty ratio is dynamically adjusted based on the gray scale values of current and previous frames for each scanning area. This dynamic adjustment allows the system to adaptively control black frame insertion time, inserting black frames only when necessary to reduce trailing effects while maintaining normal brightness during stable display periods.
2Speed
If liquid crystal response time is shortened by overvoltage driving, then trailing phenomenon is reduced, but energy consumption increases
Solution Approach 1:
Instead of continuously applying overvoltage to accelerate liquid crystal response, the patent uses periodic black frame insertion through dynamic backlight duty ratio adjustment. This periodic action allows the liquid crystal to respond naturally during normal operation while occasionally inserting black frames to reset visual persistence, thereby reducing trailing effects without continuous high energy consumption.
Solution Approach 2:
The patent changes the backlight duty ratio parameter dynamically based on gray scale characteristics of consecutive frames. By adjusting this parameter rather than maintaining fixed high voltage, the system achieves trailing reduction through temporal modulation of backlight illumination, which consumes less energy than continuous overvoltage driving.
3Object-affected harmful factors
If black frame insertion time is increased to reduce trailing, then visual persistence is controlled, but frame rate and productivity decrease
Solution Approach 1:
The patent applies black frame insertion selectively to specific scanning areas where gray scale changes indicate trailing risk, rather than uniformly applying it to the entire display. This partial action approach reduces trailing phenomenon in problematic regions while maintaining normal frame rates in stable regions, thus preserving overall productivity.
Solution Approach 2:
The display is divided into multiple scanning areas with independent backlight control. Each scanning area can have its own backlight duty ratio adjusted based on local gray scale characteristics. This segmentation allows black frame insertion to be applied only where necessary, minimizing the impact on overall frame rate while effectively reducing trailing in specific problem areas.
Data Source
AI summary
The present disclosure provides a backlight driving method and device and a display device, wherein the backlight includes a plurality of backlight scanning areas, each luminous body corresponding to each backlight scanning area is driven independently, including: acquiring display gray scale of a current frame of image and that of a previous frame of image in a backlight scanning area; determining a first backlight duty ratio according to the display gray scale of the current frame and that of the previous frame; if black frame insertion time in the first backlight duty ratio is smaller than a first black frame insertion time, acquiring a second backlight duty ratio, wherein black frame insertion time in the second backlight duty ratio is not less than the first black frame insertion time; determining drive timing of the luminous bodies in the current frame according to the second backlight duty ratio.