Transparent Layer Refractive Index for Display Illumination Uniformity
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Solution Overview
Problem
Display devices using polymer dispersed liquid crystals face issues with illumination light non-uniformity, leading to stripe-like luminance differences and degradation of display quality due to insufficient mixing of light from adjacent light-emitting elements, resulting in visual perception of luminance differences and increased frame width.
Innovation Solution
A display device configuration featuring a transparent layer with strip portions and a refractive index lower than the transparent substrate, strategically positioned between the light-emitting elements and the display panel, which suppresses light entry near the light-emitting elements while promoting it further away, ensuring uniform illumination by guiding light within the substrate and optimizing the overlapping area of pixel electrodes with the transparent layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If light-emitting elements are positioned close to the display panel, then the frame width is reduced, but illumination light non-uniformity occurs causing stripe-like luminance differences
Solution Approach 1:
A transparent layer with a refractive index lower than the transparent substrate is introduced as an intermediary component between the light-emitting elements and the display panel. This transparent layer includes strip portions that strategically guide light, acting as a mediator to redistribute illumination and eliminate stripe-like luminance differences while allowing the light-emitting elements to remain close to the panel.
2Illumination intensity
If the transparent layer has a lower refractive index than the transparent substrate, then light guidance and uniform distribution are improved, but light entry is suppressed near the light-emitting elements
Solution Approach 1:
The transparent layer is designed with strip portions that create localized regions of different optical properties. These strip portions are strategically positioned to guide light in specific areas while allowing light entry in other areas, achieving both uniform distribution and efficient light utilization through spatially varying local characteristics.
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 achieves uniform illumination light distribution across the display panel, reducing luminance differences and suppressing degradation of display quality caused by non-uniformity, thereby enhancing the overall display performance.
Implementation Method 1
a transparent layer disposed on the main surface and having a lower refractive index than the third transparent substrate... which suppresses light entry near the light-emitting elements while promoting it further away, ensuring uniform illumination by guiding light within the substrate
Data Source
AI summary
According to one embodiment, a display device includes a first transparent substrate, a second transparent substrate, a liquid crystal layer, light-emitting elements disposed in a first direction, a third transparent substrate including a main surface and a side surface opposed to the light-emitting elements, and a transparent layer disposed on the main surface and having a lower refractive index than the third transparent substrate. The third transparent substrate is bonded to the first transparent substrate or the second transparent substrate with the transparent layer sandwiched in between. The transparent layer includes strip portions disposed in the first direction and extended along a second direction.