Backlight Unit Spacer Light Regulating Layer for Luminance Uniformity
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Solution Overview
Problem
Spacers in backlight units for display devices block light, leading to dark portions and irregular luminance, which affects luminance uniformity.
Innovation Solution
Incorporating a light regulating material layer on the spacer, including wavelength conversion particles and a binder layer, to adjust viscosity and hardness, and positioning it on both surfaces of the spacer facing the light guide plate to prevent damage and improve luminance uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If spacers are used to maintain distance between light source and light guide plate, then heat damage to light guide plate is prevented, but dark portions and irregular luminance occur
Solution Approach 1:
A light regulating material layer is introduced as an intermediary between the spacer and the light guide plate. This layer mediates the light interaction, allowing the spacer to maintain its heat protection function while the light regulating material compensates for light blocking, thereby preventing dark portions and improving luminance uniformity.
Solution Approach 2:
The light regulating material layer is applied locally on the outer surface of the spacer that faces the light guide plate. This localized application addresses the specific problem area where light blocking occurs, allowing different parts of the spacer to have different functions: the support structure provides spacing for heat protection, while the light regulating material layer on the facing surface addresses luminance uniformity.
2Illumination intensity
If light regulating material layer is added on spacer surface, then luminance uniformity is improved, but device complexity increases
Solution Approach 1:
The light regulating material layer is formed using a composite material system comprising wavelength conversion particles dispersed in a binder layer. This composite structure allows the layer to regulate light effectively while maintaining a relatively simple application process and avoiding the need for complex additional optical components.
Solution Approach 2:
The light regulating material layer changes the optical parameters of the spacer by incorporating wavelength conversion particles that convert light wavelength. This parameter change allows the spacer to transform incident light into wavelengths that improve luminance uniformity, achieving the desired effect without adding complex mechanical structures.
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 dark portions and enhances luminance uniformity across areas with and without spacers, improving the overall display quality by ensuring consistent light distribution.
Implementation Method 1
The light regulating material layer may include wavelength conversion particles and a binder layer
Data Source
AI summary
A backlight unit for a display device includes: a light guide including a light incident surface; a substrate facing the light incident surface; a plurality of light sources on one surface of the substrate facing the light incident surface; and a first member disposed between the substrate and the light incident surface to space the light sources apart from the light guide. The first member includes: a support on one surface of the substrate that do not include the light source, the support having a first surface facing the light incident surface and a second surface facing the light sources; and a first layer disposed on the first surface and the second surface of the support to improve luminance uniformity across the light incident surface.