Backlight Unit Protective Member for Light Leakage and Moisture
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Solution Overview
Problem
Display devices face issues with light leakage through the light guide plate and moisture/oxygen permeation into the backlight unit, leading to reduced light efficiency and potential quality deterioration.
Innovation Solution
A display device design incorporating a protective member with reflective properties, such as an adhesive member, covering at least one surface of the light guide plate and optical member, along with a refractive layer and inorganic layers, to prevent light leakage and moisture/oxygen ingress, while enhancing light reflection and bonding strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light guide plate is used to guide light from the light source to the display panel, then light distribution is improved, but light leakage occurs at the top surface adjacent to the light incident portion reducing light efficiency
Solution Approach 1:
A reflective member is introduced as an intermediary component between the light guide plate and the display panel. This reflective member captures the leaked light at the top surface of the light guide plate and redirects it back into the light guide plate, preventing permanent light loss while maintaining improved light distribution across the display panel.
Solution Approach 2:
The light that would normally be lost through leakage at the top surface is converted into a beneficial resource. The reflective member captures this otherwise wasted light and redirects it back into the light guide plate, transforming the harmful leakage effect into a beneficial contribution to overall light efficiency.
2Device complexity
If the light guide plate and optical components are exposed to the environment, then device complexity is reduced, but moisture and oxygen permeate into the backlight unit causing quality deterioration
Solution Approach 1:
The optical components including the light conversion layer are nested within a protective encapsulation structure formed by the first and second protective members. This nested configuration allows the sensitive components to be shielded from environmental factors while maintaining a relatively simple overall device structure.
Solution Approach 2:
Thin protective films (first and second protective members) are applied to encapsulate the light guide plate and optical components. These thin films provide effective barrier protection against moisture and oxygen permeation while adding minimal structural complexity to the device.
3Reliability
If protective members are added to cover the light guide plate and optical member, then reliability is improved by preventing moisture and oxygen permeation, but device complexity increases
Solution Approach 1:
The first and second protective members are merged to form an integrated encapsulation structure that simultaneously protects both the light guide plate and the optical member. This merging approach provides comprehensive protection against moisture and oxygen while minimizing the number of separate components and assembly steps.
Solution Approach 2:
The protective members serve multiple functions simultaneously: they act as barrier layers against moisture and oxygen permeation, provide structural support for the encapsulated components, and maintain the optical properties needed for device operation. This multi-functionality reduces the need for additional specialized components.
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 light leakage, prevents moisture and oxygen from reaching the light conversion layer, thereby improving light efficiency and the overall quality and durability of the display device by enhancing the bonding strength between layers.
Implementation Method 1
a first refractive layer disposed on the light exit surface and having a refractive index lower than that of the light guide plate
Implementation Method 2
a protective member, which is may be formed as an adhesive member, having reflective properties covers at least one of the surfaces of the backlight unit
Implementation Method 3
a first inorganic layer disposed on the first refractive layer... a second inorganic layer having a refractive index lower than that of the first inorganic layer
Data Source
AI summary
A display device includes a display panel, a light source unit, a light guide plate including a light exit surface, a bottom surface, a light incident surface, an opposite surface, and first and second side surfaces connecting the light incident surface and the opposite surface and being opposite to each other, a first refractive layer disposed on the light exit surface and having a refractive index lower than that of the light guide plate, an optical member between the display panel and the light guide plate, and an protective member covering at least one of a side surface of the optical member and at least a portion of a side surface of the light guide plate corresponding thereto.