Backlight Module LED Pitch Arrangement for Heat Dissipation
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Solution Overview
Problem
Conventional backlight modules face issues with uneven heat distribution and reduced lifespan of light-emitting diodes due to identical pitch arrangements, leading to increased manufacturing costs and limited usage of light-emitting diodes with different brightness bins.
Innovation Solution
The backlight module arranges light-emitting diodes into groups with varying pitches relative to the display area center line, with closer groups to the center having larger pitches and farther groups having smaller pitches, improving heat dissipation and allowing for the use of light-emitting diodes with different brightness bins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light-emitting diodes are arranged with identical pitch in the light bar, then the manufacturing process is simple, but the heat dissipation becomes uneven and luminous efficiency decreases
Solution Approach 1:
The patent applies local quality by differentiating the pitch between light-emitting diodes based on their position in the light bar. Specifically, light-emitting diodes in the first light bar have a first pitch while those in the second light bar have a second pitch that is smaller than the first pitch. This local differentiation optimizes heat dissipation in different regions, allowing better thermal management where needed while maintaining overall manufacturing simplicity.
2Illumination intensity
If only light-emitting diodes from a single bright bin are selected, then the luminance uniformity is improved, but the manufacturing cost increases due to lower utilization rate
Solution Approach 1:
The patent applies local quality by assigning different bright bins to different light bars based on their positions. The first light bar uses light-emitting diodes from a first bright bin while the second light bar uses light-emitting diodes from a second bright bin. This allows the use of light-emitting diodes with different luminance characteristics in different regions, enabling the incorporation of components from multiple bins and improving manufacturing cost efficiency while maintaining overall luminance uniformity through the differentiated arrangement.
3Temperature
If light-emitting diodes with larger pitch are used in the center position, then the heat dissipation is improved, but the luminous intensity distribution becomes uneven
Solution Approach 1:
The patent applies local quality by strategically positioning light-emitting diodes with different pitches and bright bins in specific regions. The first light bar with larger pitch and first bright bin is positioned in one region while the second light bar with smaller pitch and second bright bin is positioned in another region. This local optimization ensures that heat dissipation needs are met in high-density regions while luminous intensity distribution is balanced across the entire display area.
Solution Approach 2:
The patent applies asymmetry by creating an asymmetric arrangement where the first and second light bars have different pitches and different bright bin assignments. This asymmetric configuration allows tailored optimization for different functional requirements - better heat dissipation in regions requiring larger pitch and appropriate luminous intensity compensation in regions with smaller pitch, achieving overall system balance.
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 arrangement enhances the heat dissipation and luminous efficiency of all light-emitting diodes, increases the utilization of light-emitting diodes with varying brightness bins, and reduces manufacturing costs by avoiding the limitation to only one identical bright bin.
Implementation Method 1
a plurality of light-emitting diodes, wherein the light-emitting diodes are divided into a plurality of corresponding light groups
Implementation Method 2
the backlight module has a light guide plate and a back board, wherein the back board is correspondingly overlapped with the display area
Data Source
AI summary
The present invention discloses a backlight module which has a plurality of light-emitting diodes. The light-emitting diodes are divided into a plurality of light groups according to pitches between the adjacent light-emitting diodes. The light-emitting diodes with respect to a display-area center line have a position center, and the light group having the light-emitting diodes with larger pitches therebetween is in a position relatively close to the position center and is in a higher bright bin; the light group having the light-emitting diodes with smaller pitches therebetween is in a position relatively away from the position center and is in a lower bright bin. Therefore, luminous conditions of the overall light-emitting diodes tend to correspondence, and proportion of usage of light-emitting diodes in different bright bins can be increased.