Backlight Module Far End Positioning for Optical Quality
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Solution Overview
Problem
The existing backlight modules with snap lugs at the edges of light guide plates in liquid crystal display modules often cause issues like bright spots, bright lines, and rough edges, affecting display quality due to the proximity of snap lugs to lattice points on the light guide plates.
Innovation Solution
The solution involves positioning structures at the far light end of the light guide plate, such as snap lugs or strip structures, which engage with corresponding grooves or protrusions in the sealant frame, eliminating snap lugs from the side edges and increasing the distance between positioning structures and lattice points, thereby reducing optical imperfections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If snap lugs are disposed at the side edges of the light guide plate for positioning, then the light guide plate can be fixed in the sealant frame, but bright spots, bright lines, and rough edges are caused due to proximity to lattice points
Solution Approach 1:
The snap lugs are extracted from the side edges of the light guide plate and relocated to the far light end. This extraction removes the harmful positioning structures from the problematic region near lattice points, eliminating bright spots and rough edges while maintaining positioning function through the relocated snap lugs at the far light end where lattice point density is lowest
2Object-generated harmful factors
If snap lugs are relocated to the far light end to eliminate optical imperfections, then display quality improves, but positioning accuracy must be maintained
Solution Approach 1:
The positioning structures are localized to the far light end region where the light guide plate has specific properties (low lattice point density). This local concentration of positioning functions at a strategically selected location achieves both optical quality improvement and positioning accuracy, as the far light end provides a natural reference point with minimal interference from lattice points
Data Source
AI summary
A backlight module and a display device are provided. The backlight module comprises a light guide plate, a sealant frame enclosing edges of the light guide plate, and a light source disposed at an end of the light guide plate. The light guide plate has a near light end near the light source and a far light end further away from the light source. The light guide plate includes at least one first positioning structure at the far light end. The sealant frame includes at least a second positioning structure disposed at a position corresponding to the first positioning structure at the far light end. The first positioning structure and the second positioning structure are engaged with each other to position the light guide plate on a plane parallel to a light emitting surface of the light guide plate.