Liquid Crystal Display Light Reflection Reducing Layer
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Solution Overview
Problem
Liquid crystal display devices face challenges with high light reflectance from wire electrodes, which affect visibility and require the use of black matrices that can limit display quality, especially in large-sized and high-resolution displays.
Innovation Solution
A light reflection reducing layer is applied to the wire electrodes, such as gate and data lines, with specific optical properties to reduce light reflectance through destructive interference, eliminating the need for a black matrix and enhancing visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal electrodes and wire lines are used in the liquid crystal display device, then electrical conductivity and device functionality are improved, but light reflectance increases causing glare and visibility problems
Solution Approach 1:
An organic compound layer is introduced as an intermediary substance between the metal electrodes/wire lines and the liquid crystal layer. This layer has optimized refractive index and thickness to reduce light reflectance through destructive interference, thereby reducing glare while maintaining the electrical functionality of the metal components.
Solution Approach 2:
The refractive index and thickness of the organic compound layer are precisely controlled within specific ranges. By optimizing these parameters, the layer achieves destructive interference of reflected light at visible wavelengths, reducing glare while preserving the electrical conductivity of the underlying metal electrodes and wire lines.
2Object-affected harmful factors
If black matrix is used to reduce light reflectance from wire electrodes, then glare is reduced, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The invention extracts and eliminates the need for the black matrix layer by using the organic compound layer already present in the TFT structure. The organic compound layer's optical properties are optimized to perform the glare reduction function that would otherwise require a separate black matrix layer, thereby simplifying the device structure.
Solution Approach 2:
The organic compound layer serves multiple functions: it acts as both the insulating/functional layer for the TFT operation and as the anti-glare layer by optimizing its optical properties. This multi-functionality eliminates the need for a separate black matrix layer, reducing device complexity while maintaining glare reduction.
3Object-affected harmful factors
If the organic compound layer thickness is increased to reduce light reflectance, then glare reduction improves, but light transmission and display brightness decrease
Solution Approach 1:
The thickness of the organic compound layer is precisely optimized within a specific range (50-200 nm). This parameter optimization achieves destructive interference of reflected light (reducing glare) while minimizing absorption of transmitted light (preserving brightness). The refractive index is also controlled within 1.5-2.5 to achieve the optimal balance between glare reduction and light transmission.
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 significantly reduces light reflectance from wire electrodes, improving display visibility and achieving high-definition displays by controlling glare and reflection, while allowing for larger and higher-resolution displays without the need for black matrices.
Implementation Method 1
A light reflection reducing layer is applied to the gate, source, drain electrodes, and data lines, with specific extinction coefficient and thickness ranges to reduce light reflectance through destructive interference
Data Source
AI summary
The present specification relates to a liquid crystal display device.