Mini LED Backlight Subfield Division for Contrast and Power
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Solution Overview
Problem
Traditional mini LED backlights for liquid crystal display devices face high power consumption and low contrast due to limited partition control, requiring a cost-effective solution for improved brightness control and reduced driver chip count.
Innovation Solution
A backlight unit with a control method that divides each partition's light-emitting unit into subfields with different durations, allowing for precise brightness control by outputting subfields in a preset order, increasing the number of charging times, and eliminating uneven brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional static driving scheme or passive matrix (PM) driving scheme is adopted to control backlight partitions, then local backlight control is realized, but the number of driver chips increases and product cost increases
Solution Approach 1:
The backlight is divided into multiple partitions that can be independently controlled. Each partition is assigned to a specific driver chip, allowing localized control without requiring every partition to have its own dedicated driver. The patent segments the backlight control into regions that share driver resources.
Solution Approach 2:
Each driver chip is designed to control multiple partitions simultaneously, making the driver multi-functional. A single driver chip can manage several backlight partitions, reducing the total number of driver chips needed while maintaining local control capability.
2Ease of manufacture
If traditional static driving scheme is adopted for backlight control, then implementation is simple, but brightness control precision is insufficient and uneven brightness occurs
Solution Approach 1:
The patent transitions from static backlight control to dynamic control by enabling real-time adjustment of partition brightness. The system dynamically modifies the brightness state of different partitions based on display content requirements, allowing precise control while maintaining implementation feasibility through systematic control methods.
Solution Approach 2:
The patent implements periodic scanning of data lines to control multiple partitions sequentially. By periodically activating different data lines in a systematic sequence, the system achieves precise brightness control for each partition while using a simplified driver structure that doesn't require simultaneous control of all partitions.
3Measurement precision
If more driver chips are used to control each backlight partition individually, then brightness control accuracy improves, but product cost increases
Solution Approach 1:
The patent merges the control function of multiple partitions into a single driver chip. By combining the control of several backlight partitions under one driver, the system maintains brightness control accuracy while reducing the total number of driver chips and associated costs.
Solution Approach 2:
The system uses the inherent structure of the display panel's data lines and scanning mechanism to control backlight partitions without requiring additional dedicated control circuits for each partition. The existing panel infrastructure is utilized to provide self-service control functionality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution reduces power consumption and enhances contrast by accurately controlling brightness across partitions, enabling more efficient and cost-effective mass production of liquid crystal display devices.
Implementation Method 1
each partition comprises a light-emitting unit... the backlight unit comprises a plurality of partitions, each partition comprises a light-emitting unit
Data Source
AI summary
The present invention provides a backlight unit and a control method thereof, and a liquid crystal display device. The control method includes steps as follows: obtaining backlight data corresponding to each partition, wherein the backlight data comprises a plurality of bits of data; dividing the light-emitting unit of each partition into a plurality of subfields with different durations in a light-emitting process during a frame, wherein each subfield corresponds to one bit of data, and any two subfields comprise different numbers of secondary subfields; and outputting the plurality of subfields in a preset order.