Quantum Dot Enhancement Film Microstructure Edge Light Compensation
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Solution Overview
Problem
Conventional quantum dot enhancement films in backlight modules suffer from an insufficient amount of light incident on their lateral portions, leading to the 'blue edge' phenomenon, where the color of light emitted from the edges of display devices differs from the center, resulting in undesirable color display.
Innovation Solution
A quantum dot enhancement film with a microstructure unit is designed to be stacked on a light guide plate, featuring a base side adjacent to the light source, a surrounding side corresponding to the light guide plate, and a microstructure unit with varying shapes and densities that increase light reflection and passage, ensuring sufficient compensation light is produced around the edges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional quantum dot enhancement film is used with a light guide plate, then the color display in the central portion is accurate, but the lateral portions have insufficient light incident, resulting in the 'blue edge' phenomenon
Solution Approach 1:
The quantum dot enhancement film is divided into a first region (central portion) and a second region (lateral portions), where each region has different optical properties. The second region is configured with higher light absorption coefficient or different quantum dot density to compensate for the insufficient light incident from the light guide plate, while the first region maintains standard properties for accurate central color display.
Solution Approach 2:
The film structure is segmented into multiple regions with different characteristics. The first region corresponds to the central viewing area with standard quantum dot distribution, while the second region corresponds to the lateral edges with modified properties to enhance light absorption and compensation light generation in areas receiving less light from the light guide plate.
2Productivity
If the quantum dot enhancement film is placed adjacent to the light guide plate, then light propagation is efficient, but the lateral portions still receive insufficient compensation light
Solution Approach 1:
The film is designed with spatially varying optical properties where the second region (lateral portions) has enhanced light absorption characteristics compared to the first region. This local optimization ensures that areas receiving less light from the light guide plate generate sufficient compensation light through increased quantum dot excitation efficiency.
3Manufacturing precision
If the quantum dot enhancement film uses standard quantum dot distribution, then the overall color accuracy is maintained, but the edge regions produce insufficient red and green light
Solution Approach 1:
Different regions of the film have different quantum dot densities or absorption coefficients. The second region (lateral portions) is configured with higher quantum dot density or optimized absorption characteristics to generate more compensation light per unit of incident light, compensating for the lower total light incident from the light guide plate in edge regions.
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 microstructure unit enhances light reflection and passage through the quantum dot enhancement film, preventing the 'blue edge' phenomenon by ensuring consistent color display across the display device, as evidenced by improved chromaticity parameters.
Implementation Method 1
When a light source irradiates light of a certain wavelength range, e.g., blue light, on the conventional quantum dot enhancement film, the two types of quantum dots may correspondingly emit red light and green light upon receiving the blue light
Implementation Method 2
a microstructure unit with varying shapes and densities that increase light reflection and passage
Data Source
AI summary
A backlight module includes a light source, a light guide plate, and a quantum dot enhancement film. The light guide plate has a light-incident side that faces toward the light source, a surrounding side that is connected to the light-incident side to constitute an outer periphery of the light guide plate, and a microstructure unit that is disposed adjacent to the surrounding side of the light guide plate. The quantum dot enhancement film is stacked on the light guide plate.