Backlight Unit Segmented PCB and Protection Structure
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Solution Overview
Problem
Direct-type backlight units for display devices are thick due to the arrangement of light sources and optical gaps, leading to increased device thickness and potential image quality issues when trying to reduce thickness.
Innovation Solution
A backlight unit design featuring a printed circuit with distinct areas for light sources and reflection plates, along with light source and printed circuit protection portions made of specific resins, to enhance light efficiency and prevent contamination, while using a light shielding pattern and air gaps to reduce hot spots and maintain image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the direct-type backlight unit uses a larger optical gap to improve light supply to the display panel, then the illumination intensity is improved, but the thickness of the backlight unit increases
Solution Approach 1:
The patent divides the printed circuit board into distinct first and second areas, with light sources positioned only in the first area. This segmentation allows optimization of light distribution while maintaining a compact overall structure, resolving the contradiction between sufficient light supply and reduced thickness.
Solution Approach 2:
The patent applies different properties to different regions: the first area has light sources for illumination, while the second area is contamination-free for mounting components. This local differentiation enables improved light supply in the first area while maintaining thin profile through optimized component placement in the second area.
2Length of stationary object
If the thickness of the backlight unit is reduced to improve device profile, then the compactness is improved, but the optical gap is reduced leading to lowered image quality
Solution Approach 1:
The patent optimizes the horizontal arrangement of light sources in the first area rather than relying solely on vertical optical gap. By strategically positioning light sources and using reflection plates in the horizontal plane, sufficient illumination is achieved while maintaining reduced thickness in the vertical dimension.
3Length of stationary object
If the light sources are arranged in a compact area to reduce thickness, then the compactness is improved, but contamination risk to the printed circuit increases
Solution Approach 1:
The printed circuit board is segmented into a first area for light sources and a second contamination-free area for other components. This spatial segmentation allows compact light source arrangement in the first area while protecting the second area from contamination, resolving the contradiction between compactness and contamination prevention.
Solution Approach 2:
The patent introduces a light source protection portion as an intermediary structure that covers the light sources in the first area. This protection portion prevents contamination from reaching the light sources and printed circuit while allowing the compact first area design to proceed, thus resolving the contradiction between compact arrangement and contamination prevention.
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 design effectively reduces backlight unit thickness, improves image quality by diffusing and shielding light, and prevents contamination of the printed circuit, thereby enhancing the overall efficiency and reliability of the display device.
Implementation Method 1
at least one reflection plate disposed between the plurality of light sources in the first area
Implementation Method 2
a light source protection portion covering the plurality of light sources and the reflection plate in the first area
Data Source
AI summary
A backlight unit for a display device comprises a plurality of light sources; a printed circuit including a first area where the plurality of light sources are disposed and a second area horizontally extended from the first area where no light source is disposed; at least one reflection plate disposed between the plurality of light sources in the first area; a light source protection portion covering the plurality of light sources and the reflection plate in the first area; and a printed circuit protection portion disposed on a side surface of the light source protection portion located at a boundary between the first and second areas and extended to an exposed surface of the printed circuit in the second area.