Mini-LED Backlight Brightness Uniformity via Partitioned Driving
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Solution Overview
Problem
Mini-LED backlight modules experience uneven brightness due to inconsistent RC loading at the proximal and distal ends of the data line, leading to poor backlight quality.
Innovation Solution
The method involves dividing the mini-LED backlight module into partitions along a data line, adjusting the duration of sub-fields within each frame to balance brightness differences between partitions, and adjusting the time durations of bright and dark sub-fields based on specific gray modes to maintain brightness within threshold ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the mini-LED backlight module size is increased to reduce cost, then the cost is reduced, but the RC loading becomes inconsistent between proximal and distal ends of the data line, causing brightness non-uniformity
Solution Approach 1:
The patent applies local quality by implementing different driving strategies for different regions of the backlight module. Specifically, it divides the backlight module into multiple zones along the data line and applies different duty cycle adjustments to proximal and distal ends, compensating for the RC loading differences in each local region to achieve overall brightness uniformity.
Solution Approach 2:
The patent changes the driving parameters (duty cycle, voltage levels, timing) dynamically based on the position along the data line. By adjusting these parameters in response to the varying RC loading conditions, the system compensates for brightness non-uniformity while maintaining the larger backlight module size for cost reduction.
2Area of stationary object
If the data line length is increased to accommodate larger backlight plates, then the backlight plate size is increased, but the IR drop effect and RC loading increase, causing brightness difference between proximal and distal ends
Solution Approach 1:
The patent implements preliminary action by pre-calculating and pre-adjusting the driving parameters for different regions before actual operation. The system compensates for the expected IR drop and RC loading effects in advance by setting appropriate duty cycles and voltage levels for proximal and distal regions, ensuring brightness consistency across the entire large-area backlight plate.
Solution Approach 2:
The patent employs feedback mechanisms to monitor and adjust the brightness output based on the actual electrical conditions along the data line. By measuring the actual brightness or electrical parameters and adjusting the driving signals accordingly, the system compensates for the effects of increased data line length and maintains uniform illumination across the large backlight plate.
Data Source
AI summary
The present application provides a method for driving a mini-LED backlight module. The method includes dividing the mini-LED backlight module into a plurality of partitions along an extending direction of a data line, dividing a period of each frame used in the mini-LED backlight module into an adjusting sub-field, and adjusting durations of a bright sub-field or a dark sub-field of the adjusting sub-field corresponding to different partitions based on different gray modes. In such a way, the brightness of each partition falls within a configured brightness threshold range.