Light Guide Plate Lens Patterns for Backlight Efficiency
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Solution Overview
Problem
Conventional edge type backlight units have low light emission efficiency due to the flat top surface of the light guide plate, which limits the collection and emission of light.
Innovation Solution
The backlight unit incorporates a light guide plate with a top surface featuring alternating first and second lens patterns that extend in a specific direction, with gradually increasing and decreasing widths and heights, and include mountain patterns, to enhance light collection and emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a flat top surface light guide plate is used, then the structure is simple and easy to manufacture, but the light emission efficiency is low
Solution Approach 1:
The patent applies curvature by forming convex lens patterns and mountain patterns on the top surface of the light guide plate. These curved structures refract and reflect light more effectively than a flat surface, improving light emission efficiency by directing light towards the display panel while maintaining ease of manufacture through injection molding or similar processes.
Solution Approach 2:
The patent implements local quality by creating alternating first and second lens patterns with different widths and mountain patterns at specific locations on the top surface. These localized structural variations optimize light extraction and distribution in different regions, enhancing overall light emission efficiency without complicating the entire structure.
2Productivity
If lens patterns with varying widths are added to the light guide plate, then light collection efficiency is improved, but the device complexity increases
Solution Approach 1:
The convex lens patterns and mountain patterns with varying widths create curved optical paths that improve light collection efficiency. The alternating first and second lens patterns with different widths refract light at different angles, enhancing light extraction from the light guide plate while the patterns can be integrated into a single manufacturing process.
Solution Approach 2:
The patent merges multiple optical functions into a single top surface structure by combining convex lens patterns, mountain patterns, and alternating width variations in one integrated design. This consolidation improves light collection efficiency without requiring multiple separate components, thereby limiting the increase in device complexity.
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 improves light emission efficiency by refracting and collecting light more effectively, as demonstrated by increased luminance compared to traditional flat surface light guide plates.
Implementation Method 1
The design improves light emission efficiency by refracting and collecting light more effectively
Implementation Method 2
A cross section of each of the first and second lens patterns taken along a first plane perpendicular to the second direction may have a plurality of mountain patterns protruding in the upward direction
Data Source
AI summary
A backlight unit includes a light source for generating light and a light guide plate for guiding the light in an upward direction, a top surface of the light guide plate includes a plurality of first and second lens patterns which extend in a first direction, the first lens pattern and the second lens pattern are alternately arranged in a second direction crossing the first direction, and a width the first lens pattern in the second direction increases gradually from a first width to a second width greater than the first width and then decreases gradually from the second width to the first width repeatedly along the first direction.