Backlight Module Diffuser Extended Portion Light Leakage
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Solution Overview
Problem
Conventional backlight modules experience light leakage due to gaps between the diffuser and prism sheets, leading to bright lines on display panels and compromised display performance.
Innovation Solution
Incorporating a diffuser with an overlapped and extended portion, combined with a plastic frame and specific adhesive placement, to align and fix the top and down prism sheets, preventing light leakage by directing emitted beams away from the diffuser's end.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the diffuser and prism sheets are stacked with gaps between them, then the assembly is simple to manufacture, but light leakage occurs causing bright lines on the display panel
Solution Approach 1:
The diffuser sheet is extended beyond the lateral boundaries of the prism sheets in the horizontal dimension, creating an overlapping region that blocks light leakage paths without requiring vertical compression or complex multi-layer stacking. This dimensional extension allows the diffuser to function as both a light-diffusing element and a light-blocking barrier.
Solution Approach 2:
The diffuser sheet has different functional regions: a central region for light diffusion and extended lateral regions for light blocking. The extended portions specifically target the gap areas where light leakage occurs, providing localized quality enhancement without modifying the entire sheet structure.
2Object-affected harmful factors
If the diffuser is extended to cover gaps, then light leakage is prevented, but the device structure becomes more complex
Solution Approach 1:
The diffuser sheet performs multiple functions simultaneously: light diffusion in the central region and light blocking in the extended lateral regions. This multi-functionality eliminates the need for separate light-blocking components, reducing overall device complexity while maintaining effective light leakage prevention.
Solution Approach 2:
The light-diffusing function and light-blocking function are merged into a single diffuser sheet component. The extended portions of the diffuser combine the blocking function with the existing diffusing structure, simplifying the overall device architecture by eliminating separate blocking elements.
3Device complexity
If the prism sheets are aligned with the diffuser edges, then the structure is simple, but light beams leak through the gaps affecting display performance
Solution Approach 1:
Instead of aligning prism sheets with diffuser edges in a simple stacked configuration, the diffuser is extended horizontally beyond the prism sheet boundaries. This dimensional change creates overlapping coverage that reliably blocks light leakage paths while maintaining structural simplicity.
Solution Approach 2:
The diffuser sheet is pre-configured with extended lateral portions that proactively cover potential light leakage gaps before light transmission occurs. This preliminary structural arrangement ensures reliable light blocking without requiring complex alignment mechanisms or additional adjustment steps.
Data Source
AI summary
A backlight module includes a lamp set, a light guiding plate, a diffuser, a top prism sheet, and a down prism sheet. The diffuser includes a first end and a second end opposite to each other, the first end of the diffuser is closer to the lamp set than the second end, and the diffuser includes a first end and a second end opposite to each other. The diffuser includes the overlapped portion stacked with the top/down prism sheets and the extended portion extending from the overlapped portion. On the first end of the diffuser, the light beams emitted by the light guiding plate may be processed by the first extended portion, instead of being emitted out directly. This can avoid the bright lines occurred by the backlit so as to reduce the optical leakage. In addition, a display device is also disclosed.