Display Transparent Layer With Low-Index Grooves for Uniform Luminance
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Solution Overview
Problem
Display devices using polymer-dispersed liquid crystals experience a decrease in luminance as the distance from the light-emitting module increases due to undesired absorption and scattering of light by the liquid crystal layer, leading to non-uniform luminance and potential degradation of display quality.
Innovation Solution
The display device incorporates a transparent layer with alternating inorganic and organic layers, where the organic layers have a lower refractive index than the inorganic and substrate layers, to control light distribution and maintain even luminance across the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the edge-light method is used with a light emitting module at the edge of the display panel, then high transmittance is achieved, but luminance decreases as distance from the light-emitting module increases
Solution Approach 1:
The patent introduces a light scattering layer with spatially varying scattering properties. The scattering power is stronger near the light emitting module and gradually weakens toward the opposite edge, creating local variations in light distribution that compensate for the natural luminance decay across the display panel
Solution Approach 2:
The patent changes the optical parameters of the light scattering layer by adjusting the refractive index difference between the light scattering particles and the surrounding medium. By controlling this refractive index difference, the scattering power can be tuned to achieve optimal luminance uniformity across the display panel
2Illumination intensity
If polymer-dispersed liquid crystals are used to switch between scattering and transparent states, then high transmittance is achieved, but undesired absorption and scattering of light occurs
Solution Approach 1:
The patent introduces a light scattering layer as an intermediary component between the light emitting module and the liquid crystal layer. This layer pre-distributes and scatters light in a controlled manner before it enters the liquid crystal layer, reducing the harmful absorption and scattering effects that would otherwise occur when light directly passes through the liquid crystal material
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 luminance and thickness variations in the liquid crystal layer, enhancing display quality by equalizing light entry and electric field strength, thereby maintaining consistent image quality.
Implementation Method 1
The transparent layer comprises a first transparent layer having a plurality of grooves arranged along the first direction and extending along a second direction perpendicular to the first direction, and a second transparent layer provided in each of the plurality of grooves. The second transparent layer has a refractive index lower than those of the second transparent substrate and the first transparent layer.
Data Source
AI summary
According to one embodiment, a display device includes a first substrate having a first transparent substrate and pixel electrodes, a second substrate having a second transparent substrate, a common electrode, and a transparent layer, a liquid crystal layer, and a plurality of light emitting elements arranged along a first direction. The transparent layer includes a first transparent layer including a plurality of grooves arranged along the first direction and extending along a second direction perpendicular to the first direction, a second transparent layer provided in each of the plurality of grooves. The second transparent layer has a refractive index lower than those of the second transparent substrate and the first transparent layer.