Backlight Module Light Control Member Edge Luminance
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Solution Overview
Problem
Mini-LED display devices experience darkening and bluish displays at the edges due to light leakage, resulting in poor luminance and color uniformity.
Innovation Solution
A backlight module with a light control member, comprising a micro-prism cover and reverse micro-prism structure, is introduced between the light emitting chip and the color conversion film to converge light emitted to the edge region, improving luminance and preventing light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If Mini-LED technology is used for high contrast and partition control, then power saving and high contrast are improved, but light leakage at edges causes darkening and bluish display at edge positions
Solution Approach 1:
The patent applies different optical control measures to different regions of the backlight module. A light control member with specific prism structures is positioned only in the edge region where light leakage occurs, while the central region maintains its original structure. This localized approach addresses the edge darkening and bluish display problems without affecting the overall performance of the Mini-LED display.
Solution Approach 2:
The light control member acts as an intermediary element between the light emitting chip and the color conversion film. It includes a first light control layer with prisms that redirect light at specific angles, and a second light control layer that further controls light distribution. This intermediary structure prevents light leakage at edges by controlling the emission angles and redirecting light to the edge regions, thereby eliminating the bluish display problem.
2Illumination intensity
If light is emitted to outside the edge region, then the edge region receives insufficient light, but redirecting light to edge region requires additional optical components
Solution Approach 1:
The patent combines multiple light control functions into a single integrated light control member. This member includes both the first light control layer with prisms for redirecting light and the second light control layer for further distribution control. By merging these functions into one component positioned between the light emitting chip and color conversion film, the patent achieves luminance uniformity without proportionally increasing device complexity.
Solution Approach 2:
The light control member utilizes specific geometric parameters of prism structures to control light behavior. The prisms are designed with specific angles and dimensions that redirect light at predetermined angles toward the edge regions. By optimizing these geometric parameters, the patent achieves effective light redistribution and luminance uniformity while maintaining a relatively simple overall structure.
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 enhances edge region luminance, eliminating darkening and bluish displays by controlling light emission angles and utilizing a barrier structure with high reflectivity to redirect light within the module.
Implementation Method 1
a light control member is provided between the light emitting chip and the color conversion film in the edge region, and the light control member is used to converge light to be emitted to outside of the edge region of the backlight module to the edge region of the backlight module
Implementation Method 2
the barrier structure comprises a base material disposed on the backlight substrate and a color conversion layer disposed around the base material
Data Source
AI summary
The present application provides a backlight module and a liquid crystal display device; the backlight module is provided with a light control member between a light emitting chip and a color conversion film, and the light to be emitted to outside of the edge region of the backlight module is converged to the edge region of the backlight module, thereby improving the luminance of the edge region of the backlight module, avoiding the problem that the edge of the backlight module is darkened during display, and since the light will not be directly emitted to outside of the edge of the backlight module, the problem that the edge of the backlight module is bluish is alleviated.