Light Source Module Refractive Index Gradient for Uniform Illumination
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Solution Overview
Problem
In light and thin display apparatuses, the non-uniformity of light irradiation from light emitting devices leads to hot spots and dark spots, resulting in uneven brightness and reduced image quality.
Innovation Solution
A light source module with a light guide plate and light-transmitting media having different refractive indices at the first and second light guide ends, which enhances light uniformity by adjusting the reflectance and critical angles of light beams, eliminating hot spots and dark spots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light emitting devices are positioned to illuminate the display panel, then the display panel receives light for image display, but non-uniform brightness with hot spots and dark spots occurs
Solution Approach 1:
The patent applies local quality by positioning light-transmitting media with different refractive indices at specific locations (first and second light guide ends) of the light guide plate. This creates localized optical property variations that control light distribution, allowing different regions of the light guide plate to have optimized light transmission characteristics for achieving uniform overall illumination.
Solution Approach 2:
The patent changes optical parameters by using light-transmitting media with different refractive indices at different light guide ends. This parameter variation modifies the critical angles and reflectance characteristics at each end, enabling precise control over light beam distribution to eliminate hot spots and dark spots.
2Illumination intensity
If light-transmitting media with different refractive indices are used at light guide ends, then light uniformity is improved, but device complexity increases
Solution Approach 1:
The patent implements local quality modifications by applying light-transmitting media with different refractive indices only at specific locations (first and second light guide ends) rather than uniformly across the entire light guide plate. This localized approach achieves the desired light uniformity improvement while minimizing 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 provides a uniform light source, improving image brightness and quality by ensuring consistent illumination across the display panel.
Implementation Method 1
The first light-transmitting medium is disposed at the first light guide end on the first surface and has a refractive index greater than a refractive index of a medium or space located at the second light guide end on the first surface
Implementation Method 2
enhances light uniformity by adjusting the reflectance and critical angles of light beams
Data Source
AI summary
A light source module is provided. At least one light-emitting device emits light and is disposed beside the light guide plate. A light guide plate includes a first surface, a second surface being opposite to the first surface and a light-entering surface connecting the first surface with the second surface. At least one first light guide end, which is located in front of the light-emitting device, and at least one second light guide end, which is connected to the first light guide end, are located on a side of the light guide plate where the light-entering surface is located. A first light-transmitting medium at least located at the first light guide end on the first surface has a refractive index which is larger then a refractive index of a medium or space located at the second light guide end on the first surface. A display device is also provided.