Curved Backlight Unit Light Source Density and Supporter Height
Solution Overview
Problem
Conventional backlight units for curved LCD panels face challenges in maintaining uniform luminance distribution and ease of installation and transportation due to differences in viewing angles and rear surface curvature.
Innovation Solution
A backlight unit design featuring a lower container with a flat bottom surface, an optical member with a concave curve, and supporters that decrease in height towards the center, along with a density of light sources increasing towards the center, facilitating easy mounting and reducing viewing angle differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a curved panel is adopted to reduce viewing angle difference, then viewing angle uniformity is improved, but the rear surface curvature creates difficulty in transportation and installation
Solution Approach 1:
The curved backlight unit is divided into multiple separable sections that can be transported independently and assembled later, transforming a single difficult-to-transport curved structure into manageable segments that maintain their curved configuration during assembly
Solution Approach 2:
The patent applies curved surfaces to the backlight unit structure to match the curved panel requirements, using curved support surfaces and curved light guide plates that conform to the desired curvature profile, thereby achieving both the required viewing angle uniformity and a structure that can be designed for ease of handling
2Illumination intensity
If light source density is increased towards the center to compensate for curvature, then luminance uniformity is improved, but device complexity increases
Solution Approach 1:
The patent implements variable light source density across different regions of the backlight unit, with higher density towards the center and lower density at the edges, allowing each region to contribute appropriately to overall luminance uniformity while using a relatively simple implementation approach
Solution Approach 2:
The patent varies the density parameter of light sources across the backlight unit surface, creating a gradient distribution that compensates for the curvature effect and achieves uniform luminance output without requiring complex control systems
Data Source
AI summary
A backlight unit includes a lower container including a bottom surface which is flat, an optical member accommodated in the lower container, having a concave curve along one direction of the bottom surface and protruding toward a center portion of the bottom surface, a plurality of supporters which contacts the bottom surface and projects toward the optical member to support the optical member, and a plurality of light sources disposed on the bottom surface and arranged between the optical member and the bottom surface, where a density of the plurality of light sources increases along the one direction towards the center portion of the bottom surface.