Light Guide Plate Microstructure V-Groove Uniformity
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Solution Overview
Problem
Backlight modules using LED light sources face challenges in achieving luminance uniformity due to hot spots and the need to reduce the number of LEDs for cost savings, which worsens the hot spot issue with brighter LEDs.
Innovation Solution
A light guide plate microstructure with V-shaped grooves of varying apex angles and base widths is applied to the surface of the light guide plate, allowing for efficient light diffusion and distribution, ensuring uniform luminance without requiring redesign for different LED configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the number of LEDs is reduced to lower production cost, then manufacturing cost is reduced, but luminance uniformity deteriorates due to hot spots
Solution Approach 1:
The patent applies local quality by creating groove units with different apex angles (first groove units with 80°-120° apex angles near LED light sources, and second groove units with 120°-160° apex angles away from light sources) to different regions of the light guide plate. This localized differentiation allows each region to be optimized for its specific function: stronger light scattering near sources to reduce hot spots, and gentler scattering in other regions to maintain overall luminance uniformity.
2Ease of manufacture
If brighter LEDs are used to reduce the number of LEDs, then production cost is reduced, but hot spots worsen due to increased luminance intensity
Solution Approach 1:
The patent applies parameter changes by varying the apex angle parameter of the groove units across different regions of the light guide plate. By changing this geometric parameter from 80°-120° near LED sources to 120°-160° in other regions, the light scattering characteristics are optimized to handle high-intensity LED output, effectively reducing hot spots while allowing the use of brighter, fewer LEDs for cost reduction.
3Manufacturing precision
If diffusive means are added to improve luminance uniformity, then luminance uniformity is improved, but device complexity increases
Solution Approach 1:
The patent merges the diffusive function directly into the light guide plate by forming groove units on its surface. This integration combines the light guiding function and the light diffusing function into a single component, eliminating the need for separate diffusive elements and thereby improving luminance uniformity without significantly increasing 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 microstructure effectively directs LED light uniformly across the display, reducing hot spots and enabling cost savings by allowing fewer LEDs while maintaining high luminance uniformity.
Implementation Method 1
Each of the V-shaped grooves has an apex angle within a range of about 80°-160°, and at least two of the V-shaped grooves of a groove unit have different apex angles
Implementation Method 2
the light guide plate microstructure is located on at least one surface of a light guide plate and comprises a plurality of groove units located continuously or discontinuously on said surface of the light guide plate
Data Source
AI summary
A light guide plate microstructure is provided. The light guide plate microstructure is located on at least one surface of the light guide plate and has a plurality of groove units. Each groove unit has multiple V-shaped grooves, and each V-shaped groove has an apex angle within a range of about 80°-160°. Furthermore, at least two of the V-shaped grooves of a groove unit have different apex angles.