Planar Light Source With Non-Uniform Luminous Cavities
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Solution Overview
Problem
Conventional planar light sources for LCDs require higher power consumption to achieve sufficient lightness in the central portion of the display panel due to uniform light distribution, which is inefficient.
Innovation Solution
The planar light source design features smaller cross-sectional areas and closer spacing of luminous cavities in the central portion compared to the edge portions, increasing light density and reducing the need for a more powerful light source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If uniform light distribution is used in the planar light source, then luminous uniformity is maintained, but the central portion cannot achieve sufficient lightness without increasing power consumption
Solution Approach 1:
The patent applies local quality by making the luminous cavities in the central portion have smaller cross-sectional areas and closer spacing compared to edge portions. This creates different light emission characteristics in different regions: the central area produces higher lightness through denser cavity arrangement, while edge areas maintain adequate illumination with larger spacing, thus avoiding excessive power consumption overall.
Solution Approach 2:
The patent employs asymmetry by deliberately designing non-uniform cavity dimensions and spacing across the planar light source. The central portion features smaller, more densely packed cavities, while edge portions have larger, more spaced cavities. This asymmetric configuration optimizes light distribution to match human vision requirements without requiring uniformly high power density across the entire panel.
2Illumination intensity
If larger power light source is installed in the central portion to meet higher lightness requirement, then central lightness is improved, but power consumption increases
Solution Approach 1:
Instead of using uniformly powerful light sources across the entire panel, the patent implements local quality by concentrating higher light emission density in the central portion through smaller, more densely spaced luminous cavities. Edge portions use larger, less dense cavities, creating a gradient of power density that matches the functional requirements of different display regions without wasting energy in areas that don't require high illumination.
3Ease of manufacture
If luminous cavities are arranged with larger spacing, then manufacturing is simplified, but light density in central portion decreases
Solution Approach 1:
The patent resolves this contradiction by applying local quality differentially across the panel. In the central portion, smaller cavities with smaller spacing are used to achieve high light density, while edge portions use larger cavities with larger spacing that are easier to manufacture. This localized approach allows the central area to meet high lightness requirements without requiring the entire panel to use difficult-to-manufacture dense cavity arrangements.
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 enhances lightness in the central portion of the display panel while maintaining luminous uniformity, thereby reducing power consumption and addressing the inefficiencies of conventional systems.
Implementation Method 1
a plurality of luminous cavities is formed by and between the upper substrate and the lower substrate
Data Source
AI summary
A planar light source is disclosed. The planar light source includes an upper substrate having a central portion and two edge portions and a lower substrate opposite to the upper substrate, wherein a plurality of luminous cavities are formed by and between the upper substrate and the lower substrate. With respect to cross sectional areas, one portion of the luminous cavities corresponding to the central portion of the upper substrate is smaller than the other portion of the luminous cavities corresponding to one of the edge portions of the upper substrate, and thus the lightness produced in the central portion is higher than that in the edge portion.