Local Dimming Engine for LCD Backlight Power Reduction
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Solution Overview
Problem
Conventional LCD display technologies require large chips and external memory for complex backlight luminance control, leading to increased production costs and energy consumption, particularly due to the high energy usage of backlight panels.
Innovation Solution
A display control apparatus that divides image data into local data for each display region, generating independent backlight control signals to adjust the luminance of multiple backlight modules, allowing for power-saving while maintaining display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional image control technology is used to control backlight luminance, then display quality is maintained, but chip size and production cost increase
Solution Approach 1:
The display panel is divided into multiple display regions, each corresponding to a backlight module. The image data is segmented into multiple local image data sets, and backlight control signals are generated independently for each region based on its local image data, enabling localized luminance control without requiring complex global processing
Solution Approach 2:
Different display regions are controlled with different backlight luminance levels according to their local image content requirements. Each region receives customized backlight control signals based on its specific local image data, allowing optimized display quality in each region without uniformly increasing overall system complexity
2Manufacturing precision
If conventional image control technology is used to control backlight luminance, then display quality is maintained, but production cost increases
Solution Approach 1:
The system segments the display into multiple regions with corresponding backlight modules, allowing independent control. This segmentation enables simpler, more cost-effective implementation compared to conventional approaches that require large external memory and complex computation, as each region can be controlled with dedicated local image data processing
Solution Approach 2:
The backlight control unit integrates multiple functions including image data division, local image data processing, and backlight control signal generation into a single integrated component. This merging reduces the need for separate external memory and computation resources, thereby lowering production costs while maintaining display quality
3Loss of energy
If backlight luminance is controlled by adjusting each LED string, then power saving is achieved, but device complexity increases
Solution Approach 1:
The backlight system is segmented into multiple independently controllable backlight modules corresponding to different display regions. Each module can be controlled separately based on local image data, enabling power saving through localized dimming while maintaining manageable control complexity through modular architecture
Solution Approach 2:
The system controls backlight luminance by adjusting LED string illumination in different time periods based on image content. This periodic control allows power saving by dimming or turning off backlight modules not currently needed for display, while the timing and sequencing are managed systematically to maintain display quality
Data Source
AI summary
A display control apparatus applied for an image display apparatus having a plurality of display regions is provided. The display regions are respectively corresponding to a plurality of backlight modules and the luminance of the backlight modules are independently controlled. The display control apparatus includes a backlight control unit. The backlight control unit receives a first image data to generate a plurality of local backlight control signals accordingly. The local backlight control signals are used for controlling the luminance of the backlight modules. The backlight control unit divides the first image data to be a plurality of local image data respectively corresponding to the display regions. Furthermore, the backlight control unit generates one of the local backlight control signals according to one of the local image data respectively.