Front Light Source with Asymmetric Light Absorbing Elements
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Solution Overview
Problem
Conventional reflective display devices experience reduced brightness and poor display effects in weak light environments due to inefficient front light sources, which lead to decreased contrast and color gamut.
Innovation Solution
A front light source comprising a transparent substrate with light source elements and corresponding light absorbing elements, where the light source elements emit blue light that excites quantum dots to produce red and green light, mixed to achieve standard white light, and are arranged to ensure one-sided light emission, increasing contrast and display effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional front light source with scattering film and front light guide plate is added to improve brightness in weak light environments, then brightness is improved, but light emits from both sides of the light guide plate causing decreased contrast and poor display effect
Solution Approach 1:
The patent extracts and removes the scattering film component from the conventional front light source structure. By eliminating the scattering film, the light guide plate no longer diffuses light in multiple directions, thereby preventing light from emitting from both sides and maintaining high contrast in dark state displaying while still providing necessary brightness enhancement.
Solution Approach 2:
The patent creates an asymmetric light emission structure where light is directed to emit primarily from one side of the light guide plate rather than both sides. This asymmetric design is achieved by removing the scattering film and configuring the optical path, resulting in improved contrast performance while maintaining brightness enhancement capability.
2Device complexity
If light source elements are arranged closely to reduce device thickness, then device complexity is reduced, but light distribution uniformity deteriorates
Solution Approach 1:
The patent applies local quality by varying the pitch between adjacent light source elements based on their position. Specifically, the pitch is configured to be smaller in central regions and larger in peripheral regions of the array. This non-uniform pitch distribution compensates for the reduced light spread from closely spaced elements, ensuring uniform light distribution across the entire display surface while maintaining overall structural simplicity.
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 display contrast and color gamut by ensuring one-sided light emission, improving the display effect in low-light environments, and maintaining uniform light distribution.
Implementation Method 1
each of the quantum dot elements comprises quantum dots for emitting red light by being excited with the blue light and quantum dots for emitting green light by being excited with the blue light
Implementation Method 2
a plurality of light absorbing elements provided at front sides of the plurality of light source elements
Data Source
AI summary
The present disclosure provides a front light source including: a transparent substrate; a plurality of light source elements provided on the transparent substrate; and a plurality of light absorbing elements provided at front sides of the plurality of light source elements. The light absorbing elements and the light source elements are in a one-to-one correspondence, an orthographic projection of each of the light source elements onto the transparent substrate is within an orthographic projection of one of the light absorbing elements corresponding to the each light source element onto the transparent substrate, and an area of the orthographic projection of each of the light source elements onto the transparent substrate is smaller than an area of the orthographic projection of one of the light absorbing elements corresponding to the each light source element onto the transparent substrate. The present disclosure also provides a display device including the front light source.