LCD Panel Reactive Mesogen Cured Layers Viewing Angle
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Solution Overview
Problem
Conventional liquid crystal display (LCD) panels with a patterned vertical alignment (PVA) mode face challenges in forming the common electrode, leading to potential misalignment of substrates and reduced aperture ratio compared to TN or IPS modes, and exhibit lower side visibility compared to front visibility.
Innovation Solution
A liquid crystal display panel with a display substrate and an opposite substrate separated by a liquid crystal layer, where the display substrate has a pixel electrode with a first cured layer and the opposite substrate has a common electrode with a second cured layer, both formed using reactive mesogen, allowing for various pretilt angles and improved side visibility by adjusting the electric field and light intensity during curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a patterned vertical alignment (PVA) mode is used to widen the viewing angle, then the contrast ratio is improved, but the aperture ratio is reduced and substrate misalignment occurs
Solution Approach 1:
The invention extracts the pattern formation from the common electrode and relocates it to the pixel electrode only. This eliminates the need for patterning the common electrode, thereby preventing substrate misalignment and maintaining a larger aperture ratio while still achieving the desired vertical alignment effect for improved contrast ratio.
Solution Approach 2:
The invention introduces a cured layer with specific optical anisotropy properties as a new dimensional element between the pixel electrode and the liquid crystal layer. This cured layer provides the necessary alignment control without requiring patterns on the common electrode, thus resolving the aperture ratio reduction issue while maintaining contrast ratio improvement.
2Illumination intensity
If a patterned vertical alignment (PVA) mode is used to widen the viewing angle, then the contrast ratio is improved, but substrate misalignment occurs
Solution Approach 1:
The invention extracts the pattern formation from the common electrode and relocates it to the pixel electrode only. This eliminates the need for patterning the common electrode, thereby preventing substrate misalignment and maintaining a larger aperture ratio while still achieving the desired vertical alignment effect for improved contrast ratio.
Solution Approach 2:
The cured layer acts as an intermediary element that provides the necessary alignment control between the pixel electrode and the liquid crystal layer. This intermediate layer enables vertical alignment without requiring patterns on the common electrode, thus preventing substrate misalignment issues while maintaining contrast ratio improvement.
3Illumination intensity
If cured layers with various pretilt angles are formed using reactive mesogen, then side visibility is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The invention changes the pretilt angle parameter of the cured layer by controlling the light irradiation intensity and direction during the curing process of reactive mesogen. This allows formation of cured layers with various pretilt angles (e.g., 0°, 45°, 90°) to improve side visibility without requiring complex manufacturing equipment or multiple processing steps.
Solution Approach 2:
The reactive mesogen material itself provides the pretilt angle control function through its photochemical properties. By simply controlling the light irradiation conditions, the material self-organizes into the desired pretilt configuration, eliminating the need for additional alignment layers or complex manufacturing processes.
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 enhances side visibility and aperture ratio by forming cured layers with various pretilt angles, reducing misalignment and side light leakage, thereby improving the overall image quality of the LCD panel.
Implementation Method 1
the first and second cured layers may be formed by curing reactive mesogen (RM) included in the liquid crystal layer
Implementation Method 2
The liquid crystal layer includes a plurality of liquid crystal molecules pretilted at the various pretilt angles by the first and second cured layers
Data Source
AI summary
A liquid crystal display (“LCD”) panel includes a display substrate, an opposite substrate and a liquid crystal layer. The display substrate includes a pixel electrode and a first cured layer. The first cured layer has various pretilt angles. The opposite substrate includes a common electrode and a second cured layer. The second cured layer has various pretilt angles. The liquid crystal layer includes a plurality of liquid crystal molecules pretilted at the various pretilt angles by the first and second cured layers.