LCD Alignment Layer Domain Control for Viewing Angle and Aperture Ratio
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Solution Overview
Problem
Liquid crystal displays (LCDs) face challenges with narrow viewing angles and reduced aperture ratio due to the need for additional processes to form slit opening patterns, which also affect light transmittance.
Innovation Solution
The LCD design includes substrates with pixel electrodes and alignment layers where liquid crystal molecules are aligned in different directions within domains, with extension parts on the electrodes to shift the fringe field region into the light blocking area, improving aperture ratio and light transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If slit opening patterns are formed in the pixel electrode and common electrode to create multiple domains, then the viewing angle is improved, but the aperture ratio is reduced
Solution Approach 1:
The patent extracts the domain separation function from the pixel electrode and common electrode structures (slit opening patterns) and relocates it to the alignment layer. The alignment layer is divided into multiple regions with different alignment directions, creating domains without requiring additional electrodes or structural modifications to the pixel electrode and common electrode.
Solution Approach 2:
The alignment layer serves as an intermediary element that creates domain structures through its internal regional differences rather than through the electrode structures. By placing different alignment regions in the alignment layer, the patent achieves domain separation without the need for slit opening patterns in the electrodes.
2Manufacturing precision
If slit opening patterns are formed to create multiple domains, then the display quality is improved, but additional manufacturing processes are required
Solution Approach 1:
The patent combines the domain creation function with the alignment layer formation process. Instead of separately creating slit opening patterns in electrodes and then forming alignment layers, the alignment layer itself is designed with multiple regions of different alignment directions, merging the domain structure creation into the alignment layer fabrication.
Solution Approach 2:
The patent removes the domain separation requirement from the electrode structure fabrication and transfers it to the alignment layer. This eliminates the need for additional slit opening pattern formation processes in the pixel electrode and common electrode, reducing manufacturing complexity.
3Adaptability or versatility
If slit opening patterns are formed in the electrodes, then multiple domains are created for wider viewing angle, but light transmittance is reduced
Solution Approach 1:
The patent extracts the domain creation mechanism from the electrode structures (which block light when slits are formed) and implements it solely through the alignment layer. Since the alignment layer does not significantly block light, this approach maintains high light transmittance while still achieving multiple domains for wide viewing angle.
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 enhances display quality by widening the viewing angle and reducing line-afterimages caused by ionic impurities, while maintaining high light transmittance and aperture ratio.
Implementation Method 1
The alignment layer is interposed between the first and second substrates and includes a first region aligned in a first direction, a second region aligned in a second direction different from the first direction
Implementation Method 2
a liquid crystal display displays an image by applying a voltage to a liquid crystal layer, which controls the transmittance of light passing through the liquid crystal layer
Data Source
AI summary
In a liquid crystal display, a first alignment layer formed on a first substrate includes a first region aligned in a first direction and a second region aligned in a second direction opposite to the first direction, and a second alignment layer formed on a second substrate facing the first substrate includes a third region aligned in a third direction different from the first direction and a fourth region aligned in a fourth direction opposite to the third direction. The liquid crystal molecules interposed between the first and second alignment layers are aligned in different directions in different domains defined by the first to fourth regions. A pixel electrode includes an extension part extending in at least one of the first to fourth directions. The aperture ratio and the light transmittance of the liquid crystal display are improved.