Backlight Assembly Edge Chromaticity Correction via Microstructure Film
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Solution Overview
Problem
Existing display devices with direct-type backlight assemblies experience uneven chromaticity at the edges due to insufficient excitation of red and green light, resulting in a bluish appearance, which affects the display effect.
Innovation Solution
A backlight assembly is designed with a microstructure film layer and a backlight film material layer containing red and green quantum dots, where the microstructure film layer, including a light transmission layer and a microstructure region, deflects and refracts the backlight at the edges to increase the optical path and enhance excitation of red and green light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If blue light LEDs are used as direct-type backlight source to excite quantum dot film, then power consumption is reduced and local dimming is achieved, but the edge of the backlight appears blue due to insufficient excitation of red and green light, causing uneven chromaticity
Solution Approach 1:
The patent applies local quality by introducing a microstructure film layer specifically at the edge region of the backlight assembly. This microstructure layer is positioned only in the edge area where chromaticity compensation is needed, allowing different parts of the backlight to have different optical properties. The microstructure film modifies the optical path length locally at the edges without affecting the center region, thereby achieving localized chromaticity correction while maintaining overall energy efficiency.
Solution Approach 2:
The patent introduces a new spatial dimension by adding the microstructure film layer between the light source substrate and the quantum dot film. This additional layer creates a differentiated optical path structure where edge regions have extended light paths through the microstructure, while the center region maintains its original short optical path. This dimensional addition allows simultaneous optimization of power consumption (center) and chromaticity uniformity (edges).
2Stability of the object's composition
If the optical path of light in the quantum dot film is increased to excite more red and green light, then chromaticity uniformity is improved, but the device structure becomes more complex
Solution Approach 1:
The patent employs a thin film microstructure layer with thickness of several micrometers to achieve the function of extending optical path length. This thin film structure provides the necessary chromaticity correction without adding significant structural complexity or volume. The microstructure pattern on the thin film surface creates the required light path extension through optical effects rather than requiring physically long paths, thus maintaining device compactness.
Solution Approach 2:
The patent replaces the need for mechanically extending the optical path (which would require thicker quantum dot layers or longer light paths) with an optical solution using microstructure film. The microstructure pattern on the film surface manipulates light paths through refraction and reflection effects, achieving extended optical interaction without increasing the physical thickness or structural complexity of the backlight assembly.
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
This solution effectively addresses the uneven chromaticity issue by increasing the excitation of red and green light at the edges, improving the display effect by ensuring uniform color across the screen.
Implementation Method 1
the microstructure film layer is configured to change, at the edge position, an outgoing angle of all or part of backlight passing through the microstructure region, so that all or part of the backlight passing through the microstructure region is deflected from a direction perpendicular to an edge where the microstructure region is located and is refracted away from a center of the microstructure film layer
Implementation Method 2
blue light emitting diodes (LEDs) are often used as a direct-type backlight source. By exciting a quantum dot film, red light and green light are generated, and the red light and the green light are combined with the blue light passing through the quantum dot film to form white light
Data Source
AI summary
There are provided a backlight assembly (1) and a display device, the backlight assembly (1) includes a light source substrate (10), a microstructure film layer (30) and a backlight film material layer (20); the backlight film material layer (20) is located on a light outgoing side of the light source substrate (10), the microstructure film layer (30) is provided between the light source substrate (10) and the backlight film material layer (20), the microstructure film layer (30) includes a light transmission layer (301) and a microstructure region (302); the microstructure region (302) is provided at an edge position of the microstructure film layer (30).