Mini LED Backlight Unit Triangular Pyramid Lens Diffusion
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Solution Overview
Problem
Backlight units using mini-LEDs or micro-LEDs face issues with luminance loss and hot spots due to non-uniform light distribution, which affect image quality and power efficiency.
Innovation Solution
A backlight unit design incorporating a color conversion sheet and diffusion lens sheets with triangular pyramid-shaped lenses to convert and uniformly spread light, minimizing luminance loss and hot spots by optimizing light separation and diffusion angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If mini-LED or micro-LED is used as light source, then light energy conversion efficiency is improved, but luminance loss occurs due to non-uniform light distribution
Solution Approach 1:
The backlight unit is divided into multiple functional layers: color conversion sheet, first diffusion lens sheet with triangular pyramid lenses, and second diffusion lens sheet. Each layer performs a specific function to progressively improve light distribution uniformity while maintaining the high efficiency of mini-LED/micro-LED sources.
Solution Approach 2:
Diffusion lens sheets with triangular pyramid-shaped lenses are introduced as intermediary elements between the mini-LED light source and the display panel. These lenses act as mediators that redirect and distribute light uniformly, converting the non-uniform light distribution into uniform illumination without significant luminance loss.
2Manufacturing precision
If mini-LED or micro-LED is used as light source, then image quality is improved, but hot spots occur due to non-uniform light distribution
Solution Approach 1:
The diffusion lens sheets are designed with triangular pyramid-shaped lenses that create specific local optical effects. Each lens redirects light in controlled directions, ensuring that light intensity is evenly distributed across different regions of the display, thereby eliminating hot spots while preserving the high image quality enabled by mini-LED/micro-LED technology.
3Device complexity
If conventional light source is used, then device complexity is reduced, but light energy conversion efficiency is lower
Solution Approach 1:
The patent changes the optical parameters of the light distribution system by introducing diffusion lens sheets with specific triangular pyramid geometries. This allows the system to maintain the high energy conversion efficiency of mini-LED/micro-LED sources while achieving uniform light distribution, without requiring a complete redesign of the light source itself.
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 converts light from mini-LEDs or micro-LEDs into white light, reducing luminance loss and hot spots, thereby enhancing image quality and power efficiency while maintaining high luminance levels.
Implementation Method 1
a color conversion sheet which converts a color of light emitted from the mini LED or the micro LED
Implementation Method 2
a first diffusion lens sheet where a plurality of first lenses in the shape of a triangular pyramid aligned in the first direction... and a second diffusion lens sheet disposed on one surface of which a plurality of second lenses having a triangular pyramid shape are aligned in the second direction
Data Source
AI summary
Disclosed is a backlight unit using a mini light-emitting diode (LED) or a micro LED as a light source according to various embodiments of the present invention. The backlight unit may comprise: a color conversion sheet for converting the color of light emitted from the mini LED or the micro LED; a first diffusion lens sheet disposed on one side of the color conversion sheet and having a plurality of first lenses having a triangular pyramid shape formed to be arranged in a first direction on one surface thereof; and a second diffusion lens sheet disposed on one side of the first diffusion lens sheet, and having a plurality of second lenses having a triangular pyramid shape formed to be arranged in a second direction on one surface thereof.