Backlight Assembly Light-Guide Plate Prism Patterns
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional backlight assemblies for LCD devices require multiple optical sheets to enhance luminance and uniformity, leading to increased manufacturing costs and thickness.
Innovation Solution
A backlight assembly design featuring a light-guide plate with stepwise thickness reduction and strategically formed prism patterns, combined with a single diffusion sheet or a single prism sheet, reduces the number of optical sheets needed while maintaining luminance and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple optical sheets are used to enhance luminance and uniformity, then luminance and uniformity are improved, but manufacturing costs and thickness increase
Solution Approach 1:
The patent combines multiple optical functions (diffusion, reflection, light guiding) into a single light-guide plate by forming different surface patterns (prism patterns, rough patterns, flat patterns) on different surfaces of the LGP. This eliminates the need for separate diffusion sheets and reflective sheets, reducing the total number of optical components while maintaining luminance and uniformity enhancement
Solution Approach 2:
The light-guide plate is designed to perform multiple optical functions simultaneously: it guides light from the edge source, diffuses light through rough patterns on the light incident surface, reflects light through prism patterns on the light emitting surface, and controls light distribution. This multi-functional design replaces what traditionally required multiple separate optical sheets
2Illumination intensity
If multiple optical sheets are used to enhance luminance and uniformity, then luminance and uniformity are improved, but thickness increases
Solution Approach 1:
The patent integrates multiple optical sheets' functions into a single light-guide plate structure. By forming prism patterns, rough patterns, and flat patterns directly on the LGP surfaces, the design eliminates the need for separate diffusion sheets and reflective sheets, thereby reducing the overall thickness of the backlight assembly
Solution Approach 2:
The patent transitions from a multi-layer stacked structure (multiple optical sheets) to a single-component three-dimensional structure (LGP with varied surface patterns on different faces). The light-guide plate uses its thickness and surface geometry to achieve optical functions that traditionally required separate planar sheets, effectively reducing the z-direction thickness
3Illumination intensity
If multiple optical sheets are used to enhance luminance and uniformity, then luminance and uniformity are improved, but manufacturing costs increase
Solution Approach 1:
The patent consolidates multiple optical components into a single light-guide plate that can be manufactured as one piece using injection molding. By forming prism patterns, rough patterns, and flat patterns directly during the molding process, the design eliminates the need to purchase, handle, and assemble multiple separate optical sheets, thereby reducing manufacturing costs
Solution Approach 2:
The patent changes the manufacturing approach from assembling multiple precision optical sheets to injection molding a single component with integrated surface patterns. This parameter change in the manufacturing process (from assembly to molding) simplifies production, reduces material waste, and lowers overall manufacturing costs while maintaining the optical performance
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 enhances luminance and reduces manufacturing costs by minimizing the number of optical sheets required, resulting in a thinner and lighter backlight assembly.
Implementation Method 1
The light-reflecting surface has a plurality of first prism patterns spaced apart from each other and a plurality of flat portions each of which is formed between the first prism patterns
Implementation Method 2
The light-emitting surface has a plurality of second prism patterns formed thereon
Data Source
AI summary
A backlight assembly includes a light source, a light-guide plate (LGP), a reflective sheet and at least one optical sheet. The light source emits light. The LGP includes a light-incident surface, a light-reflecting surface and a light-emitting surface. The light-incident surface receives the light from the light source. The light-reflecting surface has a plurality of first prism patterns spaced apart from each other and flat portions formed between the first prism patterns, which are substantially perpendicular to the light-incident surface. The light-emitting surface has a plurality of second prism patterns formed thereon. The reflective sheet is disposed below the LGP. At least one optical sheet is disposed on the LGP.