Local Dimming Control for LCD Backlight Units
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Solution Overview
Problem
The existing local dimming methods for LCD devices require multiple microcomputers to rearrange dimming values for different block connection orders, leading to increased fabrication costs and limited applicability to varying port division structures.
Innovation Solution
A method and apparatus that assign first block indexes to backlight blocks, detect and store their connection order, generate second block index information, and rearrange local dimming values based on this information to align with the block connection order, eliminating the need for microcomputers at each port.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple microcomputers are used to rearrange dimming values for different block connection orders, then the local dimming control accuracy is improved, but the fabrication cost increases
Solution Approach 1:
The patent merges the functions of multiple port-specific microcomputers into a single microcomputer that handles all ports. The microcomputer stores multiple block index ordering information sets corresponding to different port division structures and uses a single device to rearrange dimming values for all ports, eliminating the need for separate microcomputers at each port while maintaining control accuracy
Solution Approach 2:
The microcomputer is designed with universal functionality to support multiple port division structures (e.g., 4-port, 6-port configurations). It stores multiple block index ordering information sets and can adapt to different backlight unit configurations, making a single device perform the work of multiple dedicated microcomputers
2Measurement precision
If multiple microcomputers are used for each port, then the local dimming control is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple separate microcomputer units into a single integrated microcomputer that manages all ports. This consolidation reduces the number of independent control devices from multiple port-specific microcomputers to one universal microcomputer, simplifying the overall device architecture while maintaining precise local dimming control through stored block index ordering information
3Measurement precision
If a fixed microcomputer configuration is used, then the control accuracy is maintained, but the adaptability to different port division structures decreases
Solution Approach 1:
The microcomputer is designed with universal adaptability to support different port division structures (4-port, 6-port, etc.). It stores multiple block index ordering information sets that correspond to various backlight unit configurations, allowing the single microcomputer to adapt to different structures without sacrificing control accuracy
Solution Approach 2:
The microcomputer pre-stores multiple block index ordering information sets corresponding to different port division structures before operation. This preliminary preparation enables the system to quickly adapt to different backlight unit configurations without requiring real-time reconfiguration, maintaining control accuracy across various structures
Data Source
AI summary
A driving method for local dimming of a Liquid Crystal Display (LCD) device and an apparatus using the same are disclosed. The driving method includes assigning a first block index to each of a plurality of blocks into which backlight unit is divided, detecting a connection order of the blocks in the backlight unit, arranging the first block indexes according to the block connection order, storing first block index ordering information that specifies the arranged first block indexes, retrieving the stored first block index ordering information, generating second block index information that specifies second block indexes corresponding to the first block indexes of the backlight unit, determining a local dimming value for each block by analyzing input data on a block basis according to the second block index information, rearranging the local dimming values arranged based on the second block index information according to the first block index ordering information, and driving the plurality of blocks respectively using the rearranged local dimming values of the plurality of blocks.