Backlight Module Ink Layer Absorbs Blue Light Leakage
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Solution Overview
Problem
In thinner liquid crystal display devices, the narrower frame fails to shield unintended light, leading to light leakage and blue light halo, causing a 'blue edge' issue due to low conversion efficiency of blue light at the edges.
Innovation Solution
A backlight module is designed with an ink layer on the end surfaces of the optical element set, which absorbs unconverted blue light, reducing light leakage and halo effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the frame is narrowed to make the display device thinner and lighter, then the device thickness and weight are reduced, but the frame can no longer shield unintended light, causing light leakage and blue light halo
Solution Approach 1:
An ink layer is introduced as an intermediary substance between the optical elements and the environment. This ink layer specifically absorbs stray blue light that would otherwise leak through the narrowed frame, thereby resolving the contradiction between thin frame design and light shielding requirement
Solution Approach 2:
The light shielding function is extracted from the frame structure and transferred to a dedicated ink layer. This allows the frame to be narrowed for thinner devices while the ink layer independently performs the light absorption function, preventing blue light leakage
2Device complexity
If the phosphor coating thickness is reduced or packaging is simplified, then the wavelength conversion film has lower manufacturing complexity, but the conversion efficiency of blue light decreases, causing blue light leakage and blue light halo
Solution Approach 1:
The ink layer serves as a complementary intermediary that absorbs the blue light which the wavelength conversion film fails to convert. This allows the wavelength conversion film to have simpler structure with lower manufacturing complexity while the ink layer ensures complete blue light absorption, preventing blue light halo
Solution Approach 2:
The unconverted blue light, which would normally be a harmful effect causing blue light leakage, is converted into a manageable parameter by using the ink layer to selectively absorb it. This transforms the problem of insufficient conversion efficiency into a controlled light absorption process
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 configuration effectively minimizes the blue edge phenomenon by absorbing unconverted blue light, improving the image quality of liquid crystal display devices.
Implementation Method 1
The ink layer is disposed on the at least one end surface of the optical element set. When light is transmitted to an edge of the backlight module, part of the light not converted by the wavelength conversion film will be absorbed by the ink layer.
Data Source
AI summary
A backlight module includes a back plate, an optical element set, a wavelength conversion film, a light source, and an ink layer. The optical element set is disposed on the back plate and has a first surface, a second surface and at least one end surface. The first surface faces the back plate and is opposite to the second surface. The at least one end surface is connected to the first surface and the second surface. The wavelength conversion film is disposed on the back plate. The light source is adapted to provide light, and the light is transmitted to the wavelength conversion film and the optical element set. The ink layer is disposed on the at least one end surface of the optical element set. A display device is further provided. The backlight module and the display device may reduce the phenomenon of blue edge caused by light leakage.