Backlight Unit Hexagonal LED Arrangement Brightness Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Direct type backlight units for LCDs face issues with brightness uniformity due to the placement of point light sources, such as LEDs, which results in higher brightness directly above the LED circuit boards but lower brightness between them, leading to non-uniform illumination across the LCD panel.
Innovation Solution
A backlight unit with a hexagonal cell arrangement on the arrangement surface, where each side of each cell contacts an adjacent cell, and the placement of white light providing units like LEDs is optimized to ensure uniform light distribution across the LCD panel, with specific configurations for long side, short side, and corner cells to achieve consistent brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a plurality of LED circuit boards are disposed in parallel rows with LEDs seated in a line, then the structure is simple and easy to manufacture, but the brightness uniformity deteriorates with high brightness directly above LEDs and low brightness between adjacent LED circuit boards
Solution Approach 1:
The invention divides the arrangement surface into an array of hexagonal cells, with each cell containing one LED. This segmentation approach distributes the light sources more uniformly across the surface, eliminating the bright spots directly above LED lines and dark areas between circuit boards, thereby achieving uniform brightness while maintaining manufacturing simplicity
Solution Approach 2:
The invention transitions from a linear one-dimensional arrangement of LEDs on circuit boards to a two-dimensional hexagonal grid pattern. This dimensional change allows LEDs to be distributed across the entire arrangement surface in a compact hexagonal lattice, achieving uniform illumination while reducing the need for multiple separate circuit boards
2Device complexity
If LEDs are arranged in parallel rows on circuit boards, then the device complexity is low, but the brightness distribution becomes non-uniform with distinct bright and dark regions
Solution Approach 1:
The invention merges multiple parallel LED circuit boards into a single integrated arrangement surface with a hexagonal cell structure. All LEDs are seated directly on this unified surface in a hexagonal pattern, eliminating the need for multiple separate circuit boards and their associated mounting structures, thereby reducing device complexity while achieving uniform brightness distribution
Solution Approach 2:
The invention applies local quality by ensuring each hexagonal cell contains exactly one LED positioned to provide uniform illumination to its specific region. This localized distribution strategy ensures that every area of the arrangement surface receives consistent light intensity, eliminating the bright and dark regions caused by linear LED arrangements
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
The solution provides a more uniform brightness distribution across the LCD panel by strategically arranging LEDs in a hexagonal pattern, ensuring that each area receives a consistent intensity of light, thereby enhancing the overall display quality.
Implementation Method 1
The point light source is an LED
Data Source
AI summary
A backlight unit comprises an arrangement surface and a plurality of point light sources arranged on the arrangement surface, wherein the arrangement surface is divided into an array of hexagonal cells, a plurality of the cells comprising a white light providing unit. An LCD comprising a backlight unit on which a point light source is efficiently disposed and an efficient arrangement method of a point light source are provided.