Backlight Dichroic Filter Prevents Blue Light Leakage
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Solution Overview
Problem
Conventional display apparatuses suffer from light leakage issues, particularly with blue light escaping through the light guide member, which affects display quality and color reproducibility.
Innovation Solution
Incorporation of a quantum dot sheet or tube and dichroic filters to convert blue light into white light by absorbing and emitting red and green light, while preventing blue light leakage through strategic filter placement on the light guide member and quantum dot sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a light guide member is used to guide blue light from the light source to the display panel, then light transmission efficiency is improved, but blue light leaks through the connection surface affecting display quality
Solution Approach 1:
A quantum dot sheet is introduced as an intermediary substance between the light guide member and the display panel. The quantum dot sheet contains red and green quantum dots that convert the blue light passing through the light guide member into red and green light, thereby preventing blue light leakage while maintaining efficient light transmission.
Solution Approach 2:
The patent changes the wavelength parameter of the light by using quantum dots with specific size parameters. The quantum dot sheet contains quantum dots of different sizes that absorb blue light and emit red and green light at different wavelengths, thus transforming the harmful blue light into useful red and green light for display.
2Manufacturing precision
If quantum dots are used to convert blue light to red and green light, then color accuracy is improved, but device complexity increases due to additional components
Solution Approach 1:
The quantum dot sheet combines multiple functions into a single component: it acts as both a light conversion medium (converting blue to red and green) and a filtering layer (blocking blue light leakage). This merging of functions achieves high color accuracy without proportionally increasing device complexity.
Solution Approach 2:
The quantum dot sheet serves multiple purposes simultaneously: converting blue light to red and green light, blocking blue light leakage through the connection surface, and enhancing overall display quality. This multi-functionality reduces the need for separate components for each function.
3Manufacturing precision
If dichroic filters are added to prevent blue light leakage, then display quality is improved, but manufacturing complexity increases
Solution Approach 1:
The patent uses dichroic filters that selectively reflect blue light while transmitting red and green light. This color-selective filtering property allows the filters to prevent blue light leakage without blocking the useful red and green light needed for display, thereby improving display quality while maintaining manufacturing feasibility.
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 prevents blue light leakage, enhancing display quality and color accuracy by ensuring that only mixed red, green, and blue lights are directed to the display panel, thereby improving image presentation.
Implementation Method 1
The quantum dot sheet includes first quantum dots each having a size to absorb the first color light and emit a second color light and second quantum dots each having a size to absorb the first color light and emit a third color light
Implementation Method 2
The first dichroic filter reflects the first color light and transmits the second and third color lights
Data Source
AI summary
A display apparatus includes a display panel and a backlight unit. The backlight unit includes a light source emitting a first color light, a light guide member, quantum dots, and a dichroic filter preventing the first color light from being leaked.