Backlight Unit Flexible Substrate Heat Management
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Solution Overview
Problem
Existing backlight units for display apparatuses face challenges in efficiently distributing light and managing heat generated by light source drivers, leading to potential overheating and damage.
Innovation Solution
A flexible light source substrate with extension portions and connectors disperses light source drivers to reduce heat generation by distributing the connection points, allowing each driver to manage a group of light source units independently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If light source drivers are concentrated in one location to simplify connection, then device complexity is reduced, but heat generation causes overheating and damage
Solution Approach 1:
The light source substrate is divided into multiple extension portions (first, second, and third extension portions) that spatially separate different functional regions. Light source units are disposed on the first extension portion while light source drivers are disposed on the third extension portion, physically segmenting the heat-generating components from the light-generating components to reduce thermal interference.
Solution Approach 2:
The patent transitions from a conventional planar or concentrated driver arrangement to a three-dimensional extended substrate layout. The multi-directional extension portions (first direction for light sources, second direction for intermediate extension, third direction for drivers) create spatial separation in multiple dimensions, effectively distributing heat across a larger volume and reducing localized temperature rise.
2Temperature
If light source drivers are dispersed to reduce heat generation, then temperature control is improved, but device complexity increases
Solution Approach 1:
The light source substrate serves multiple functions simultaneously: it acts as a mechanical support structure, an electrical connection medium, and a spatial organizing framework. The extension portions are not merely structural additions but integrated pathways that carry both electrical signals and provide physical separation, reducing the need for separate cooling structures or additional connection components.
Solution Approach 2:
The patent combines the functions of substrate support, electrical connection, and thermal management into a single integrated structure. The extension portions serve as both mechanical supports and electrical traces, while the spatial arrangement inherently provides thermal management. This merging reduces overall device complexity despite the dispersed driver configuration.
3Reliability
If connection points are distributed to manage heat, then reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The extension portions are pre-designed and pre-positioned on the light source substrate during substrate fabrication, establishing fixed reference locations for light source units and drivers. This preliminary structuring provides manufacturing guidelines and alignment references that simplify subsequent assembly processes, reducing the actual precision requirements during final assembly despite the distributed configuration.
Data Source
AI summary
A backlight unit includes a plurality of light source groups each including a plurality of light source units which generate light. The backlight unit further includes a light source substrate on which the light source groups are disposed and a plurality of light source drivers connected to the light source substrate to drive the light source groups. The light source substrate includes a first extension portion extended in a first direction. The light source units are disposed on the first extension portion. The light source substrate further includes a plurality of second extension portions extended from the first extension portion in a second direction crossing the first direction and a plurality of third extension portions extended from ends of the second extension portions in the first direction. The light source drivers are connected to the third extension portions to drive the light source groups.