Backlight Module Light Guide Plate Transition Region
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Solution Overview
Problem
Current backlight modules experience color mixing due to the diffusion of colored lights from light-emitting diodes, which reduces color purity and visual effectiveness in electronic devices.
Innovation Solution
Incorporating a light-blocking opening in the transition region of the light guide plate between adjacent light-emitting elements, which prevents the overlap and interference of colored lights by directing them towards the effective light-exiting region, enhancing visual clarity and aesthetic appeal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light-emitting elements are disposed on the light guide plate to generate colored lights, then the visual decoration and indication effect is improved, but the colored lights diffuse and overlap causing color mixing that reduces color purity
Solution Approach 1:
The light guide plate is segmented into different functional regions: a light incident surface for receiving light from light-emitting elements, a light exiting surface for projecting colored lights, and a transition region connecting them. This segmentation allows controlled light propagation paths for different colors, preventing diffusion and overlap that cause color mixing.
Solution Approach 2:
Different regions of the light guide plate are given different optical properties. The transition region has specific refractive index characteristics that differ from the light incident and exiting surfaces. This local quality variation enables precise control over light propagation, ensuring colored lights maintain their purity without diffusing into adjacent regions.
2Manufacturing precision
If a light-blocking opening is added in the transition region to prevent color mixing, then color purity is improved, but the device structure becomes more complex
Solution Approach 1:
The light-blocking opening is merged into the transition region of the light guide plate, making it an integrated component rather than a separate element. The transition region itself is designed with specific optical properties that work together with the light-blocking opening to control light propagation, combining multiple functions into a unified structure.
Solution Approach 2:
The transition region serves multiple functions: it connects the light incident surface to the light exiting surface, controls the propagation of colored lights, and works with the light-blocking opening to prevent color mixing. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
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 effectively prevents color mixing, ensuring that distinct colored lights are clearly projected, thereby enhancing the user's visual experience and beautifying electronic devices.
Implementation Method 1
a light guide plate (110) including a light-incident surface (112), a light-exiting surface (116) opposite to the light-incident surface (112)
Implementation Method 2
a transition region (A2) located between the light-incident surface (112) and the effective light-exiting region (A1)
Implementation Method 3
a light-blocking opening (118) disposed in the transition region (A2) between adjacent two light-emitting elements (120a, 120b)
Data Source
AI summary
A backlight module includes a light guide plate and a plurality of light-emitting elements. The light guide plate includes a light-incident surface, an effective light-exiting region, a transition region located between the light-incident surface and the effective light-exiting region, and a light-blocking opening disposed in the transition region. The light-emitting elements are disposed at the light-incident surface and emit light toward the effective light-exiting region. The light-blocking opening is located between a plurality of light-emitting regions formed in the transition region by the plurality of light-emitting elements respectively.