Light Guiding Member Geometry for Backlight Brightness Uniformity
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Solution Overview
Problem
Current backlight modules in display devices face challenges in efficiently guiding and enhancing light emission, particularly in converting point light sources into plane light effectively, which affects the brightness and uniformity of the illumination.
Innovation Solution
A light source module comprising a light emitter and a light guiding member with a specific geometry, where the light guiding member receives light from the emitter and outputs it to a light guiding board, utilizing a phosphor layer to change light color and reflective materials to ensure efficient light distribution, combined with an optical diaphragm unit for further brightness enhancement and direction adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional light sources are used in backlight modules, then the structure is simple, but the light emission efficiency and uniformity are insufficient
Solution Approach 1:
A light guiding member is introduced as an intermediary component between the light source and the backlight module. This light guiding member includes a light entering face, a light exiting face, and a reflecting face, serving as a mediator to redirect and distribute light effectively, thereby improving light emission efficiency without significantly complicating the overall structure.
Solution Approach 2:
The light guiding member transforms point light sources into plane light by utilizing a three-dimensional geometric structure with multiple faces (entering face, exiting face, and reflecting face). This dimensional transformation allows light to be distributed across a two-dimensional plane, improving uniformity while maintaining structural efficiency.
2Illumination intensity
If point light sources are used, then the device structure is simple, but the conversion to plane light is ineffective
Solution Approach 1:
The light guiding member employs a three-dimensional geometric configuration with a light entering face, light exiting face, and reflecting face to transform point light sources into plane light. This dimensional transformation effectively distributes light across a two-dimensional area, improving brightness uniformity while maintaining a relatively simple structural design.
Solution Approach 2:
The light guiding member utilizes curved or angled surfaces (reflecting face) to redirect light rays from the point source in multiple directions, transforming the concentrated point light into a distributed plane light pattern. The geometric curvature and angling of surfaces play a crucial role in achieving uniform light distribution.
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 light emission efficiency by converting point light sources into plane light, improving brightness and uniformity, and enabling effective light distribution to the backlight module, thereby enhancing the overall illumination performance.
Implementation Method 1
utilizing a phosphor layer to change light color
Implementation Method 2
reflective materials to ensure efficient light distribution
Data Source
AI summary
A light source includes a light emitter configured to emit light, and a light guiding member located at a side of the light emitter. The light guiding member includes a first light entering face, a first light exiting face and a top face connecting the first light entering face and the first light exiting face. The first light entering face is coupled to the light emitter. The first light entering face is opposite to the first light exiting face. The first light entering face has a height larger than that of the first light exiting face. The top face includes a first connecting face and a second connecting face extending from an angle relative to the first connecting face. The light guiding member is configured to receive the light from the light emitter via the first light entering face and output the light via the first light exiting face.