Front Light Module Edge Geometry for Uniform Illumination
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Solution Overview
Problem
Conventional front light modules in reflective displays suffer from uneven brightness due to discontinuous light sources, leading to the hot spot phenomenon, which is difficult to address effectively as the display size increases and precision requirements for alignment become more stringent.
Innovation Solution
A front light module design featuring stacked transparent materials with varying refractive indices and edge portions, where light sources are alternately arranged with different distances to the light incident surface, optimizing light distribution for uniform intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If discontinuous light sources are used in the front light module, then the device complexity is reduced, but the light intensity distribution becomes uneven causing hot spot phenomenon
Solution Approach 1:
The patent applies local quality by creating different edge configurations at different locations of the light guide plate. Specifically, the first edge has a first distance to the light incident surface while the second edge has a second distance, creating localized variations in light extraction characteristics to compensate for the discontinuous light source arrangement and eliminate hot spots.
Solution Approach 2:
The patent employs asymmetry by designing the light guide plate with non-uniform edge structures. The first and second edges are positioned at different distances from the light incident surface, breaking the symmetric structure to achieve more uniform light distribution across the display panel, thereby resolving the hot spot issue caused by discontinuous light sources.
2Illumination intensity
If screen dot density of the light guide plate is increased to address hot spot, then the light intensity distribution uniformity is improved, but the manufacturing precision requirement increases significantly
Solution Approach 1:
The patent changes the geometric parameters of the light guide plate by introducing edges at different distances from the light incident surface. This parameter variation creates different light extraction paths that naturally distribute light more uniformly, achieving hot spot reduction without requiring high screen dot density or precise alignment.
3Area of stationary object
If display size increases, then the area of the display module is improved, but the hot spot phenomenon becomes more pronounced and alignment precision requirements increase
Solution Approach 1:
The patent introduces a new dimensional parameter by positioning edges at different distances from the light incident surface in the depth direction. This three-dimensional configuration creates varied light paths that distribute light uniformly across larger display areas, effectively addressing hot spot issues as display size increases.
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 design significantly reduces the hot spot phenomenon, achieving a uniform light intensity distribution and improved optical quality for display modules by carefully managing the refractive indices and distances of the transparent materials and light sources.
Implementation Method 1
light emitted by the light source may travel in total internal reflection in the light guide plate
Implementation Method 2
The total internal reflection is canceled by using microstructures, and the light is refracted toward the display module, so as to convert the light source into a surface light source with a uniform optical distribution
Data Source
AI summary
A front light module including a plurality of stacked transparent materials and a plurality of light sources is provided. The light sources are configured to provide light beams, and are disposed beside the light incident surface of the transparent materials. An edge portion is at a location of at least one of these transparent materials which is adjacent to the light sources. The edge portion includes a plurality of first sub-edges and a plurality of second sub-edges. The first sub-edges are disposed corresponding to the light sources. The first sub-edges and the second sub-edges are arranged alternately in a row, and one of the distances from the first sub-edges to the light entering surface is greater than one of the distances from the second sub-edges to the light entering surface. Furthermore, a display module is also provided.