Front Light Source Asymmetric Reflective Lens Uniform Illumination
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Solution Overview
Problem
Reflective Liquid Crystal Display (LCD) screens face challenges in achieving uniform illumination, especially in dark environments, as general lighting sources tend to illuminate only one end of the screen, resulting in poor visual perception.
Innovation Solution
A front light source is designed with a polarizing lens and a light bar equipped with light-emitting units, where the polarizing lens features asymmetrically arranged reflective curved surfaces to achieve uniform illumination across the reflective display screen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a general lighting source is used to illuminate the display screen, then the structure is simple and cost is low, but the illumination is non-uniform with the end near the light source being bright and the far end being dark
Solution Approach 1:
The light bar is divided into multiple light-emitting units arranged along the first direction, with each unit independently controllable. This segmentation allows different sections of the light bar to emit light with different intensities, enabling uniform illumination across the entire display screen by compensating for the distance-related brightness decay.
Solution Approach 2:
The patent changes the emission parameters of individual light-emitting units by adjusting their brightness levels. The control module varies the intensity parameters of light-emitting units along the first direction, with units farther from the display screen emitting stronger light to compensate for distance, thereby achieving uniform illumination across the screen surface.
2Illumination intensity
If a single light-emitting unit is used, then the device complexity is low, but the illumination coverage is insufficient to light up the entire screen uniformly
Solution Approach 1:
The light bar is divided into multiple light-emitting units arranged along the first direction, with each unit independently controllable. This segmentation allows different sections of the light bar to emit light with different intensities, enabling uniform illumination across the entire display screen by compensating for the distance-related brightness decay.
Solution Approach 2:
The patent uses multiple light-emitting units with varying intensities rather than a single uniform light source. By applying partial action (different intensity levels to different units) and slightly excessive action (more units than a single source), the system achieves complete and uniform coverage of the display screen.
3Illumination intensity
If light-emitting units are arranged uniformly across the display area, then the illumination uniformity is high, but the device complexity and cost increase significantly
Solution Approach 1:
Instead of distributing light-emitting units across the two-dimensional display area, the patent arranges all units linearly along the first direction in a one-dimensional configuration. This dimensional simplification reduces structural complexity while maintaining uniform illumination through controlled intensity variation along the linear arrangement.
Solution Approach 2:
The patent changes the emission parameters of individual light-emitting units by adjusting their brightness levels. The control module varies the intensity parameters of light-emitting units along the first direction, with units farther from the display screen emitting stronger light to compensate for distance, thereby achieving uniform illumination across the screen surface.
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 front light source provides uniform illumination to the reflective display screen, improving visual perception by ensuring both the low-beam and high-beam ends are adequately lit, while maintaining a simple, reliable, and cost-effective structure.
Implementation Method 1
the polarizing lens includes: a light incident surface, a light exiting surface, a first reflective curved surface and a second reflective curved surface
Data Source
AI summary
A front light source and a display device are disclosed, and the front light source includes a housing extending along a first direction, and a side wall of the housing having an opening extending along the first direction; a supporting frame, located inside the housing and extending along the first direction, where the supporting frame includes a supporting surface; a light bar, where the light bar extends along the first direction and is attached to the supporting surface; and a side of the light bar far away from the supporting surface has a plurality of light-emitting units arranged along the first direction; a polarizing lens located between the light bar and the opening and extending along the first direction; where the polarizing lens includes: a light incident surface, a light exiting surface, a first reflective curved surface and a second reflective curved surface, extending along the first direction.