Interlaced Lighting System Reduces Power Driving Unit Ratings
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Solution Overview
Problem
Existing backlight systems for flat panel displays require high-rated power driving units to maintain brightness, leading to increased manufacturing costs and design complexity, especially when operating stereoscopic display devices for 3D images, as they need to double the brightness output.
Innovation Solution
The implementation of an interlaced driving mechanism in the lighting system, where power driving units are connected to lighting units in a specific configuration to reduce the phase difference between currents, allowing for stable operation with lower rated power outputs by maintaining current levels at Ion, thereby reducing the maximum power output and simplifying design complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If power driving units are connected to neighboring lighting units sequentially, then the circuit layout is simplified, but the maximum current and power output requirements increase
Solution Approach 1:
The patent divides the lighting units into two interlaced groups (odd-numbered and even-numbered units) that are driven by separate power driving units. This segmentation allows each power driving unit to handle only half the total current load, reducing the maximum power output requirement while maintaining simplified circuit layout through systematic grouping
2Device complexity
If power driving units drive multiple neighboring lighting units simultaneously, then the circuit configuration is simplified, but the rated power of power driving units must be increased
Solution Approach 1:
The lighting units are segmented into interlaced odd and even groups, with each group driven by a dedicated power driving unit. This reduces the current burden on each power driving unit, allowing the use of lower-rated (cheaper) components while maintaining a systematic and manufacturable circuit configuration
Solution Approach 2:
Instead of connecting each power driving unit to all neighboring lighting units in sequence, the patent inverts the connection pattern by connecting each power driving unit to alternating (interlaced) lighting units throughout the array. This inversion reduces peak current demands and allows for lower-rated power components, reducing manufacturing cost
3Illumination intensity
If brightness is doubled for stereoscopic display, then the image quality is improved, but the power consumption and design complexity increase
Solution Approach 1:
The patent segments the lighting control into two independent interlaced systems (odd and even units), each with its own power driving unit. For stereoscopic display, this allows independent control of the two systems to achieve doubled brightness output without requiring a single overloaded power driving unit, thereby reducing design complexity
Solution Approach 2:
The patent implements dynamic control of the interlaced lighting units with phase differences, allowing the system to adaptively manage power distribution. For stereoscopic mode, the system can dynamically activate and synchronize both interlaced groups to achieve doubled brightness while maintaining manageable power requirements through phased operation
Data Source
AI summary
A lighting system includes a first lighting unit for generating output light according to a first current, a second lighting unit for generating output light according to a second current, a third lighting unit for generating output light according to a third current, a fourth lighting unit for generating output light according to a fourth current, a first power driving unit electrically connected to the first and third lighting units, and a second power driving unit electrically connected to the second and fourth lighting units. The second lighting unit is disposed between the first and third lighting units. The third lighting unit is disposed between the second and fourth lighting units. The first power driving unit is employed to drive the first and third currents. The second power driving unit is employed to drive the second and fourth currents.