Backlight Unit Light Control Member for Uniform Luminance
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Solution Overview
Problem
Conventional edge-illumination type backlight units for LCDs suffer from non-uniform luminance due to hot spots caused by point light sources, leading to degraded display quality and light leakage, which affects the efficiency and color reproducibility of liquid crystal displays.
Innovation Solution
A backlight unit design incorporating a light control member with a reflection preventing layer, a base substrate for scattering or diffusing light, and a light adjusting filter to minimize light leakage and filter specific wavelengths, improving light efficiency and color reproducibility by reducing hot spots and ensuring uniform luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If an LED point light source is used in an edge-illumination type backlight unit, then the LCD can be made thinner and have a long useful life, but hot spots are created causing non-uniform luminance and degraded display quality
Solution Approach 1:
A light control member is introduced as an intermediary component between the LED light source and the light guide plate. This light control member includes a reflection preventing layer that redirects reflected light toward the light guide plate, and a light adjusting filter that modifies the light distribution pattern. This intermediary structure eliminates hot spots by redistributing light uniformly while maintaining the thin edge-illumination configuration.
Solution Approach 2:
The patent changes the optical parameters of the light path by using a light control member with specific refractive indices and optical properties. The reflection preventing layer and light adjusting filter modify the light distribution parameters, transforming the concentrated point-source light pattern into a uniform area illumination pattern, thereby resolving the hot spot issue while preserving the thin design.
2Use of energy by moving object
If an LED point light source is used to emit light toward the light guide plate, then light can be provided efficiently, but part of the emitted light leaks and fails to enter the light guide plate
Solution Approach 1:
The patent converts the harmful reflected light that would normally leak away into a beneficial resource by using the reflection preventing layer to redirect it toward the light guide plate. This layer captures light that would otherwise be lost and redirects it at appropriate angles, transforming energy loss into useful light transmission and improving overall light efficiency.
Solution Approach 2:
The light control member acts as an intermediary that manages the light path between the LED source and light guide plate. It includes components that specifically address light leakage by redirecting escaped light back toward the light guide plate, thereby reducing energy loss while maintaining efficient light emission.
3Illumination intensity
If a light control member with multiple layers is added to prevent hot spots and light leakage, then light efficiency and uniformity are improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple optical functions into a single integrated light control member. Rather than adding separate components for reflection prevention, light distribution control, and wavelength filtering, these functions are merged into one multi-layer structure. This integration reduces the number of discrete parts and assembly steps while achieving the desired uniform luminance output.
Solution Approach 2:
The light control member is designed as a multi-functional component that simultaneously performs reflection prevention, light distribution control, and wavelength filtering. By making this single component universal and multi-functional, the patent avoids the complexity of multiple separate components while achieving comprehensive light control for uniform luminance.
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 enhances light efficiency and color reproducibility by preventing light leakage and filtering specific wavelengths, resulting in improved display quality and uniform luminance across the LCD panel.
Implementation Method 1
a reflection preventing layer disposed adjacent to the light source module and configured to prevent reflection of light
Implementation Method 2
a base substrate disposed on the reflection preventing layer and configured to scatter or diffuse light transmitted through the reflection preventing layer
Implementation Method 3
a light adjusting filter disposed on the base substrate and configured to filter light including a first wavelength among light provided by the light source module
Data Source
AI summary
A backlight unit including a light guide plate (LGP), a light source module disposed adjacent to an incident surface of the LGP and configured to irradiate light to the incident surface, and a light control member disposed between the light source module and the incident surface, in which the light control member includes a reflection preventing layer disposed adjacent to the light source module and configured to prevent reflection of light, a base substrate disposed on the reflection preventing layer and configured to scatter or diffuse light transmitted through the reflection preventing layer, and a light adjusting filter disposed on the base substrate and configured to filter light including a first wavelength among light provided by the light source module.