Light Conversion Shielding Member for Blue Light Leakage in LCD Backlights
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Solution Overview
Problem
Blue light leakage in edge-type backlight units of liquid crystal display devices reduces color reproducibility by causing unconverted blue light to escape through gaps between the light-facing portion and mold frame, and between the mold frame and optical sheet, impacting display performance.
Innovation Solution
A display device incorporating a light conversion shielding member made of white conversion silicone, which is disposed between the mold frame and optical sheet, covering the side and edge portions to convert leaking blue light into white light, thereby enhancing color reproducibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a light conversion sheet is used to convert blue light to white light, then color reproducibility is improved, but blue light leakage through gaps between components reduces the effectiveness of this conversion
Solution Approach 1:
The patent extracts the light conversion function from the main light conversion sheet and creates a separate light conversion shielding member. This member is specifically positioned to cover gaps and edges where blue light leaks, separating the light conversion function into two distinct components: one for general illumination and another for preventing leakage.
Solution Approach 2:
The light conversion shielding member acts as an intermediary component between the light guide plate and the optical sheet. It fills and covers the gaps between these components, preventing blue light from directly passing through without conversion, while still allowing converted white light to pass through.
2Ease of manufacture
If the mold frame and optical sheet are assembled with gaps for structural reasons, then ease of manufacture is improved, but blue light leaks through these gaps reducing display quality
Solution Approach 1:
The light conversion shielding member is applied locally at specific positions where blue light leakage occurs - namely the gaps between the mold frame and optical sheet, and the edges of the optical sheet. Rather than requiring tight assembly throughout the entire structure, the shielding member provides targeted light conversion only at the critical leakage points, maintaining ease of manufacture while improving color reproducibility.
3Device complexity
If blue light is allowed to pass through gaps to maintain structural simplicity, then device complexity is reduced, but color reproducibility deteriorates
Solution Approach 1:
The light conversion shielding member serves multiple functions simultaneously: it acts as a structural component maintaining the assembly, a light conversion element converting blue light to white light, and a sealing element covering gaps between components. This multi-functionality allows the device to maintain structural simplicity while achieving good color reproducibility without requiring complex additional 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 light conversion shielding member effectively reduces blue light leakage, improving color reproducibility by converting unconverted blue light into white light, thus enhancing the overall display performance.
Implementation Method 1
a light conversion shielding member disposed on a surface of the support unit of the mold frame and having a side portion that covers a side surface of the optical sheet
Data Source
AI summary
A display device includes a bottom chassis on which a light source is disposed, a light guide plate disposed on the bottom chassis and configured to guide light emitted from the light source to a display panel, an optical sheet on the light guide plate, a mold frame coupled to the bottom chassis and including a support unit on which the display panel is disposed, and a light conversion shielding member disposed on a surface of the support unit of the mold frame having a side portion that extends down from the support unit and covers a side surface of the optical sheet.