Edge-Lit Display Panel Refraction Layout for Uniform Brightness
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Solution Overview
Problem
Display devices using polymer-dispersed liquid crystals experience a decrease in brightness as the distance from the light-emitting module increases, leading to non-uniform brightness and reduced display quality.
Innovation Solution
The display device incorporates a transparent layer with strip portions arranged along a specific direction, having a lower refractive index than the surrounding substrates, to control light distribution and minimize light absorption and scattering, thereby maintaining consistent brightness across the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light emitting module is arranged at an edge of the display panel using the edge-light method, then transmittance is improved, but brightness becomes non-uniform and decreases as distance from the light-emitting module increases
Solution Approach 1:
The patent applies local quality by introducing a transparent layer with spatially varying refractive index distribution. The refractive index is specifically designed to be higher near the light-emitting module and gradually lower toward the opposite edge, creating localized optical properties that compensate for the natural brightness decay in different regions of the display panel
Solution Approach 2:
The patent changes the refractive index parameter of the transparent layer to resolve the brightness uniformity problem. By adjusting the refractive index distribution (making it higher near the light source and lower at the far edge), the light propagation characteristics are modified to achieve uniform brightness across the entire display panel while maintaining high transmittance
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 configuration suppresses non-uniform brightness and enhances display quality by equalizing light intensity across the panel, while also facilitating easy manufacturing.
Implementation Method 1
The transparent layer is disposed between the first transparent substrate and the light guide. The transparent layer comprises a plurality of strip portions arranged along the first direction and extending along a second direction perpendicular to the first direction. The plurality of strip portions have a refractive index lower than that of the second transparent substrate.
Data Source
AI summary
According to one embodiment, a display device includes a light guide, a first transparent substrate, a second transparent substrate, a plurality of light-emitting elements disposed along a first direction, a liquid crystal layer containing stripe-like polymers and liquid crystal molecules, and a transparent layer. The transparent layer includes a plurality of strip portions disposed along the first direction, extending in a second direction and having a refractive index lower than that of the second transparent substrate. Each of the strip portions includes a first end portion located on a side facing the light-emitting elements and a linear second end portion opposite to the first end portion.