Edge-Type Backlight Unit With Vertical LED Blocks for Local Dimming
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Solution Overview
Problem
Edge type backlight units face challenges in achieving sufficient brightness and uniformity for large-sized LCDs, and are not suitable for partial driving methods like local dimming, which affects image quality and production efficiency.
Innovation Solution
The design includes a light guiding plate with a substrate-mounted LED module positioned vertically, adjacent to the sidewall of a bottom chassis, and a driving unit to control current signals for each LED block, allowing for local dimming and improved thermal efficiency through enhanced heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If an edge type backlight unit is used to reduce thickness, then the thickness is reduced, but sufficient brightness and uniformity cannot be achieved for large-sized LCDs
Solution Approach 1:
The backlight unit is divided into multiple independent light emitting sections along the edge, with each section containing multiple LED blocks that can be individually controlled. This segmentation allows the system to maintain thin profile while achieving sufficient overall brightness through cumulative light output from multiple sections.
Solution Approach 2:
The invention transitions from a single continuous light source to multiple discrete light emitting sections arranged along the edge. This dimensional redistribution allows light to be emitted from multiple points simultaneously, achieving uniform brightness across large screens while maintaining the thin edge-type structure.
2Length of stationary object
If an edge type backlight unit is used to reduce thickness, then the thickness is reduced, but brightness uniformity deteriorates
Solution Approach 1:
The edge backlight is segmented into multiple light emitting sections with multiple LED blocks each, allowing distributed light emission that improves uniformity across the display area while maintaining thin profile.
Solution Approach 2:
Each light emitting section can be independently controlled with different brightness levels, allowing local adjustment to achieve uniform overall illumination. The driving unit regulates current to each LED block individually, enabling compensation for variations in light distribution.
3Device complexity
If an edge type backlight unit is used, then the size is reduced, but partial driving method like local dimming cannot be implemented
Solution Approach 1:
The backlight unit is divided into multiple independently controllable light emitting sections, each containing multiple LED blocks. This segmentation enables the driving unit to selectively control individual sections or blocks, implementing local dimming functionality while maintaining the compact edge-type structure.
Solution Approach 2:
The driving unit dynamically controls the current supplied to each LED block independently, allowing real-time adjustment of brightness in different regions. This dynamic control enables local dimming adaptability while keeping the overall device compact.
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 configuration enables effective local dimming, increased contrast ratio, and clear image quality while reducing the thickness of the backlight unit, making it suitable for large, thin products with improved thermal efficiency and extended LED lifespan.
Implementation Method 1
a light emitting device as a light source
Implementation Method 2
directly converts electrical energy into optical energy
Implementation Method 3
a light guiding plate; a light source module including a substrate provided with a circuit wiring and a plurality of light emitting diode (LED) blocks
Data Source
Figure 1
Figure 2~3
Figure 4(a)~4(c)
AI summary
There is provided a backlight unit. The backlight unit includes a light guiding plate (100), a light source module (200) including a substrate (220) provided with a circuit wiring and a plurality of light emitting diode (LED) blocks each including one or more LED (210) mounted on the substrate (220) to be positioned vertically with respect to the substrate (220), the one or more LED (210) being disposed to face a side surface (110) of the light guiding plate (100), a bottom chassis (300) including a base (310) and a sidewall (320) upwardly extending from a circumference of the base (310), and accommodating the light source module (220) and the light guiding plate (100) in such a manner that the one or more LED (210) is disposed to be adjacent to the sidewall (320), and a driving unit controlling a current signal applied to each of the plurality of LED blocks to thereby control brightness for each LED block.