Backlight Module Positioning Gaps Reduce Frame Width
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Solution Overview
Problem
Conventional liquid crystal display devices have a limited frame width due to positioning structures on the back plate, which affect image display stability and lead to poor light guiding uniformity and optical face-changing nonuniformity.
Innovation Solution
A backlight module design featuring a back plate with positioning gaps between side walls, where a light guide plate and optical film are positioned using corresponding protruding portions, eliminating the need for additional positioning structures on the back plate and ensuring proper alignment without increasing the frame width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If positioning structures are added on the back plate to ensure light guide plate stability, then image display stability is improved, but frame width increases
Solution Approach 1:
Instead of adding positioning structures on the back plate, the patent inverts the approach by creating positioning gaps on the back plate and corresponding positioning protrusions on the light guide plate. This allows the light guide plate to position itself relative to the back plate without requiring additional structures that would increase frame width.
Solution Approach 2:
The patent extracts the positioning function from the back plate by creating positioning gaps between side walls, and transfers this positioning function to the light guide plate through positioning protrusions. This separation eliminates the need for additional positioning structures on the back plate that would increase frame width.
2Manufacturing precision
If positioning structures are added on the back plate to ensure light guide plate alignment, then light guiding uniformity is improved, but device complexity increases
Solution Approach 1:
The patent merges the positioning function with the existing side walls of the back plate by creating positioning gaps between them. The positioning protrusions on the light guide plate engage with these gaps, combining structural support and positioning functions into a unified design that does not increase device complexity.
Solution Approach 2:
The side walls of the back plate serve multiple functions: providing structural support and creating positioning gaps for light guide plate alignment. This multi-functionality eliminates the need for separate positioning structures, maintaining device complexity at acceptable levels while achieving precise alignment.
3Manufacturing precision
If additional positioning structures are added to the back plate, then optical face-changing nonuniformity is reduced, but the frame width increases
Solution Approach 1:
Instead of adding positioning structures on the back plate to control optical uniformity, the patent inverts the approach by using positioning gaps and corresponding protrusions. This ensures proper alignment of the light guide plate without requiring additional structures that would increase frame width, thereby achieving optical uniformity within the existing frame constraints.
Data Source
AI summary
A backlight module includes a back plate and a light guide plate. The light guide plate and the back plate are stacked together. The back plate includes a bottom surface and a plurality of side walls located on edges of the bottom surface; a positioning gap is formed between each two adjacent side walls of the plurality of side walls. The light guide plate includes a light guide plate body part and at least one light guide positioning portion disposed on a side surface of the light guide plate body part. The at least one light guide positioning portion is engaged with a corresponding positioning gap.