Array Substrate Nanoparticle Layer for Outdoor Display Viewing Angle
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Solution Overview
Problem
Existing technologies for large-scale outdoor display devices face challenges in enlarging the viewing angle without compromising the orientation uniformity of liquid crystal molecules, leading to decreased transmittance, contrast, and dark-state uniformity.
Innovation Solution
An array substrate is created with a substrate divided into reflective and transmissive regions, featuring a nanoparticle layer formed on an insulating layer for diffuse reflection, using metal oxide nanoparticles like titanium dioxide, aluminium oxide, or zinc oxide to enhance viewing angle without disrupting the liquid crystal molecule orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mechanical friction or etching process is used to form an uneven surface on the reflective layer, then the viewing angle is enlarged, but the orientation uniformity of the liquid crystal molecules is decreased
Solution Approach 1:
The patent applies local quality by creating a reflective region with a specific local structure (nanoparticle layer on insulating layer) only where needed, rather than uniformly treating the entire surface. This localized approach enables diffuse reflection enhancement at the reflective region while leaving the transmissive region unaffected, thus resolving the contradiction between viewing angle expansion and orientation uniformity preservation
Solution Approach 2:
The patent introduces an intermediary insulating layer between the reflective layer and the nanoparticle layer. This intermediary layer acts as a buffer that prevents direct contact between the nanoparticles and the reflective layer, avoiding surface destruction while still enabling the diffuse reflection effect through the nanoparticle layer above it
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 solution effectively enlarges the viewing angle while maintaining the performance metrics of transmittance, contrast, and dark-state uniformity, making it suitable for large-scale outdoor displays.
Implementation Method 1
a nanoparticle layer for diffuse reflecting an incident light is formed on a side of the insulating layer that is far from the substrate
Data Source
AI summary
The present invention discloses an array substrate and a method for preparing the same, and a display device. The array substrate comprises a substrate, and a thin-film transistor and a passivation layer formed on a side of the substrate, and the array substrate is divided into a reflective region and a transmissive region, wherein an insulating layer is formed on the reflective region on a side of the passivation layer that is far from the substrate, and a nanoparticle layer for diffuse reflecting an incident light is formed on a side of the insulating layer that is far from the substrate. Not only the viewing angle of the array substrate is enlarged, but also the performances of the array substrate such as transmittance, contrast and dark-state uniformity are guaranteed, thus the present invention is especially applicable for display devices for large-scale outdoor display.