Mini-LED Backlight Driving Circuit Grayscale Depth
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current active-matrix mini-light-emitting diode (Mini-LED) backlight driving methods for liquid crystal display (LCD) panels face limitations in achieving high grayscale depth due to short charging time and voltage drop, which restrict the number of grayscale levels and brightness depth, failing to meet market demands for higher brightness requirements.
Innovation Solution
A driving method that divides N-bit data into M groups of sub-bit data, using corresponding driving voltages and times to increase the number of grayscale levels, where the driving time decreases with higher sub-bit data levels and different driving voltages are applied based on the sub-bit data, effectively increasing the brightness depth of the light-emitting units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the charging time is extended to achieve higher grayscale levels, then the brightness depth increases, but the productivity decreases due to longer charging time per frame
Solution Approach 1:
The patent segments the N-bit grayscale data into M groups of sub-bit data, where each group corresponds to a specific time slot within a frame. This segmentation allows the system to process and charge different grayscale levels in parallel across multiple time slots, effectively increasing the achievable grayscale depth without extending the total frame charging time beyond the original constraint.
2Device complexity
If the number of LED driver chips is reduced to lower cost, then the device complexity decreases, but the controllability of individual backlight areas deteriorates
Solution Approach 1:
The patent makes each LED driver chip universal by enabling it to control multiple backlight areas through the segmented time-slot approach. Instead of requiring dedicated driver chips for each area, a single driver chip can sequentially control different areas by processing different groups of sub-bit data in different time slots, thus reducing the total number of driver chips while maintaining local controllability.
3Power
If the charging voltage is increased to overcome voltage drop, then the power increases, but the energy loss increases due to higher voltage stress
Solution Approach 1:
The patent dynamically adjusts the charging voltage based on the actual charging requirements of each time slot and area. By segmenting the charging process into multiple time slots with different voltage requirements, the system applies higher voltage only when and where needed, rather than maintaining high voltage continuously across all areas. This dynamic voltage adjustment overcomes voltage drop issues during charging while minimizing energy loss from excessive voltage application.
Data Source
AI summary
The present disclosure discloses a driving method, a driving circuit, and a display device. The driving method includes: acquiring driving data that includes N-bit data; dividing the N-bit data into M groups of sub-bit data in sequence, wherein each group of the sub-bit data includes (N/M)-bit data, M is a positive divisor of N, and M is not 1 or N; and driving, by adopting a corresponding driving voltage and corresponding driving time, a corresponding light-emitting unit to emit light, according to each group of the sub-bit data.