Backlight Unit Light Path Converter Dispersion Grooves
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Solution Overview
Problem
Conventional backlight units for LCD devices suffer from a 'hot spot' phenomenon where overlapping light emissions create bright, uneven areas due to insufficient light distribution, leading to reduced light efficiency.
Innovation Solution
A backlight unit incorporating a light guide plate with dispersion grooves that refract light in overlapping areas, combined with a light path converter that disperses light using grooves of increasing density and width further from the light sources, and optionally includes light scattering materials within these grooves to enhance light diffusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LEDs are mounted on a light source substrate with maximum light efficiency contact to the light guide plate, then light extraction efficiency is improved, but overlapping light emissions create hot spots and uneven light distribution
Solution Approach 1:
The patent applies local quality by introducing a light path converter only in specific areas where hot spots occur (where light emissions overlap), while leaving other areas unchanged. The light path converter includes dispersion grooves with varying depths and widths localized to problem areas, creating different light path characteristics in different regions of the light guide plate.
Solution Approach 2:
The light path converter acts as an intermediary element between the light source substrate and the light guide plate. It includes a first surface in contact with the light source substrate and a second surface in contact with the light guide plate, serving as a mediating structure that redirects and disperses light paths to prevent overlapping and hot spot formation.
2Productivity
If the light guide plate is designed to guide light from LEDs, then light guidance function is improved, but overlapping light paths cause hot spots in certain areas
Solution Approach 1:
The light path converter is segmented into multiple dispersion grooves with different depths and widths, each segment handling specific light paths. The grooves are arranged in patterns (e.g., grid, diagonal, or random) to segment and redirect light paths systematically, preventing concentration of light in specific areas while maintaining overall light guidance efficiency.
Solution Approach 2:
The patent introduces a vertical dimension to light path control by creating dispersion grooves with varying depths. This three-dimensional structure (depth, width, and horizontal position) allows light to be redirected in multiple directions, transforming the two-dimensional light guide plate into a three-dimensional light management system that effectively distributes light uniformly.
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 solution effectively reduces or prevents the 'hot spot' phenomenon by dispersing light in overlapping areas, ensuring more uniform light distribution and improved light efficiency across the LCD panel.
Implementation Method 1
a light guide plate including a light incident surface on which the lights generated from the light sources are incident and converting line-shaped lights incident on the portion into a surface-shaped light
Implementation Method 2
a light path converter converting a traveling direction of the lights traveling a portion of the light guide plate in an area where the lights emitted from the light sources overlap each other
Implementation Method 3
the light path converter includes a plurality of dispersion grooves formed from an upper surface and a lower surface of the portion of the light guide plate
Data Source
AI summary
A backlight unit capable of reducing or effectively preventing a hot spot phenomenon includes a plurality of light sources generating lights, a light guide plate including a portion on which the lights generated from the light sources are incident and converting the lights incident on the portion into a surface-shaped lights and a light path converter converting a traveling direction of the lights incident on the portion of the light guide plate in an area where the lights emitted from the light sources diodes overlap each other.