Liquid Crystal Display Panel Refractive Index Gradient Layer
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Solution Overview
Problem
Conventional liquid crystal display panels suffer from low transmittance due to high reflection rates between film layers, primarily caused by significant differences in refractive indices between silicon oxide and silicon nitride layers, limiting the utilization of light intensity to only 3-10%.
Innovation Solution
A manufacturing method that forms refractive index gradient layers using plasma-enhanced chemical vapor deposition, with layers of silicon oxide and silicon nitride, to progressively adjust refractive indices between film layers, reducing reflection rates and enhancing transmittance by creating gradient regions that minimize interface reflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional multi-film layer structure with silicon oxide and silicon nitride layers is used, then the display panel can be manufactured with standard process, but the reflection rate between film layers is high causing low transmittance
Solution Approach 1:
The patent introduces a refractive index gradient layer that gradually transitions the refractive index from that of the silicon nitride layer to the silicon oxide layer. This gradient structure changes the optical parameters at the interface, reducing the abrupt refractive index difference and thereby minimizing reflection loss while maintaining compatibility with standard manufacturing processes.
Solution Approach 2:
The refractive index gradient layer is positioned specifically at the interface between silicon nitride and silicon oxide layers where the optical property mismatch occurs. By localizing the gradient structure at this critical interface region, the patent addresses the reflection problem precisely where it occurs without modifying the entire film stack.
2Loss of energy
If the refractive index difference between adjacent film layers is reduced, then the reflection rate decreases and transmittance improves, but the manufacturing complexity increases due to gradient layer deposition
Solution Approach 1:
The patent employs plasma-enhanced chemical vapor deposition (PECVD) to create the refractive index gradient layer by controlling deposition parameters such as gas flow ratios and power settings. This approach achieves the desired gradient structure through parameter control during a single deposition process, avoiding the need for multiple separate layers or complex post-processing steps.
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 method significantly reduces reflection rates between film layers, thereby increasing the transmittance of liquid crystal display panels, enhancing brightness while lowering power consumption, and achieving a total transmittance of up to 98.62%.
Implementation Method 1
A manufacturing method that forms refractive index gradient layers using plasma-enhanced chemical vapor deposition
Implementation Method 2
When light penetrates through interfaces between the film layers, reflection and refraction occur on the interfaces
Implementation Method 3
When light penetrates through interfaces between the film layers, reflection and refraction occur on the interfaces
Data Source
AI summary
A manufacturing method for a liquid crystal display panel is disclosed and includes a step forming a refractive index gradient layer, a step forming a gate electrode insulation layer, a step forming a first interlayer dielectric layer, and a step forming a second interlayer dielectric layer. The step forming a refractive index gradient layer includes depositing a silicon nitride layer on a glass substrate, depositing the refractive index gradient layer on the silicon nitride layer. The refractive index gradient layer is silicon oxide, and includes a lower refractive index decremental layer and a lower refractive index constant layer. A refractive index of the decremental layer gradually decreases along a direction away from the silicon nitride layer, the lower refractive index constant layer is on the lower refractive index decremental layer. A reflection rate between light in film layers can be lowered to improve light transmittance of the display panel.