Slim Backlight Unit with Dual Light Source Modules
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Solution Overview
Problem
Existing display apparatuses with edge-lit backlight units face challenges in achieving ultra-thin designs due to the need for multiple light guide plates when using two types of light sources, which impairs color reproduction and increases thickness.
Innovation Solution
A slim backlight unit design that utilizes a single light guide plate with first and second light source modules disposed adjacent to its edges, where the light emission distributions are tailored to complement each other, including the use of LEDs and laser diodes, with the second light source modules having a lower height and angled irradiation to match the emission distribution of the first light source modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two types of light sources are used to improve color reproduction range, then color reproduction is improved, but the number of light guide plates increases and thickness increases
Solution Approach 1:
The patent combines two different light sources (LED and laser diode) into a single integrated light guide plate structure. The light guide plate simultaneously receives light from both light sources and guides it to the display panel, eliminating the need for separate light guide plates for each light source. This merging approach maintains the color reproduction benefits of dual light sources while reducing the overall thickness of the backlight unit.
Solution Approach 2:
The single light guide plate is designed to serve multiple functions: it guides light from both LED and laser diode sources, and it is positioned to receive light from different directions (edge for LED, lower side for laser diode). This multi-functional design allows one component to replace what would traditionally require multiple separate components, thereby reducing thickness while maintaining color reproduction quality.
2Reliability
If two types of light sources are used to improve color reproduction, then color reproduction is improved, but the device complexity increases
Solution Approach 1:
The patent merges the functions of multiple light guide plates into a single integrated light guide plate. This light guide plate is configured to receive light from both LED and laser diode sources and guide it appropriately to the display panel, thereby reducing the number of components and simplifying the overall device structure while maintaining the color reproduction benefits of using two light sources.
Solution Approach 2:
The single light guide plate performs multiple functions: it guides light from different light sources (LED and laser diode), receives light from different directions (edge and lower side), and delivers light to the display panel. This multi-functional design reduces device complexity by eliminating the need for separate light guide plates for each light source.
3Length of stationary object
If edge-lit type backlight unit is used to reduce thickness, then thickness is reduced, but uniformity of light distribution may be impaired
Solution Approach 1:
The patent applies local quality by positioning different light sources at different locations relative to the light guide plate. The LED is positioned at the edge while the laser diode is positioned at the lower side, allowing each light source to illuminate specific regions. This localized arrangement helps achieve uniform light distribution across the display panel while maintaining the thin profile of the edge-lit design.
Solution Approach 2:
The patent employs asymmetric positioning of light sources, with the LED located at the edge and the laser diode at the lower side of the light guide plate. This asymmetric configuration allows light to be introduced from different directions and positions, which helps achieve uniform light distribution across the display panel while maintaining the thin edge-lit structure.
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
This configuration enhances color reproduction while maintaining a slim form factor by minimizing the overall thickness of the backlight unit and display apparatus, suitable for ultra-high definition screens.
Implementation Method 1
a light guide plate configured to emit light incident thereon
Implementation Method 2
Light-emitting diodes (LEDs) have been used as a light source in backlight units
Implementation Method 3
two types of light source backlight units may be used along with a laser diode (LD) in an LED light source
Data Source
AI summary
A backlight unit includes a light guide plate configured to emit light toward a display panel, and a plurality of light source units disposed adjacent to an edge of the light guide plate so as to irradiate light toward the light guide plate. The light source units include first and second light source modules configured to irradiate different types of light toward an edge of the light guide plate. The first light source modules are disposed adjacent to a first part of the edge of the light guide plate, and the second light source modules are disposed adjacent to a second part of the edge of the light guide plate.