Backlight Module Microstructure Unit for Blue Edge Correction
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Solution Overview
Problem
Conventional quantum dot enhancement films in backlight modules lead to an uneven color display due to insufficient light incidence on lateral portions, resulting in the 'blue edge' phenomenon, where the color of light emitted from the edges differs from the central portions.
Innovation Solution
A backlight module design featuring a light guide plate with a microstructure unit adjacent to its surrounding side, which increases light reflection and incidence on the quantum dot enhancement film, allowing quantum dots to be excited multiple times and produce sufficient compensation light, thereby preventing the blue edge phenomenon.
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 can be enhanced, but the lateral portions of the quantum dot enhancement film receive insufficient light incidence, resulting in the blue edge phenomenon
Solution Approach 1:
The patent introduces a microstructure unit with light-reflecting properties disposed at the lateral side of the light guide plate. This creates a localized light-reflecting structure that specifically addresses the light deficiency at the lateral portions of the quantum dot enhancement film, while leaving the central portions unaffected. The microstructure unit has different optical properties compared to the main body of the light guide plate, enabling differential light management across different regions.
Solution Approach 2:
The microstructure unit acts as an intermediary element between the light guide plate and the quantum dot enhancement film. It mediates the light transmission by reflecting light from the lateral side of the light guide plate toward the quantum dot enhancement film, thereby supplementing the insufficient light incidence at the lateral portions without interfering with the overall light guide function.
2Illumination intensity
If the light guide plate structure is modified to increase light reflection, then compensation light can be generated, but the device complexity increases
Solution Approach 1:
The light guide plate is segmented into a main body portion and a lateral side portion, with the microstructure unit specifically disposed at the lateral side. This segmentation allows the patent to modify only the necessary region (lateral side) to provide light reflection, while keeping the main body structure simple and unchanged. The microstructure unit itself can be segmented into multiple light-reflecting elements arranged in a pattern.
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 design effectively reduces the blue edge phenomenon by ensuring consistent light emission across the display device, as illustrated by improved chromaticity parameters, with significant reduction in color discrepancies near the lateral sides.
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 that is disposed adjacent to the surrounding side of the light guide plate
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.