Display Substrate Alignment Layer for Visibility
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Solution Overview
Problem
Display panels face issues with visibility due to luminance differences between front and side views, which are exacerbated by light-blocking patterns that decrease the aperture ratio, affecting both visibility and light transmittance.
Innovation Solution
A display substrate design featuring electrodes with opening portions and alignment layers having different alignment directions, which are formed using photoreactive materials and irradiation techniques to align liquid crystals across multiple domains, reducing retardation differences between front and side views.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light-blocking pattern is disposed at a boundary of sub-alignment parts to increase visibility, then visibility is improved, but the aperture ratio of the display panel decreases
Solution Approach 1:
The patent extracts the light-blocking function from a separate pattern and integrates it into the alignment layer itself. The alignment layer is configured to have different alignment directions in different regions, effectively creating domain boundaries that block light without requiring additional metal patterns, thus maintaining aperture ratio while improving visibility.
Solution Approach 2:
The alignment layer serves as an intermediary element that performs dual functions: aligning liquid crystals and creating light-blocking boundaries between domains. By using the alignment layer's directional properties to define domain boundaries, the patent avoids adding separate light-blocking structures that would reduce aperture ratio.
2Illumination intensity
If multiple sub-alignment parts with different alignment directions are included in each pixel part to align liquid crystals in different domains, then visibility is improved, but a difference between front luminance and side luminance is generated at boundaries of sub-alignment parts
Solution Approach 1:
The patent applies local quality by configuring the alignment layer to have different alignment directions in different regions corresponding to different domains. This local variation in alignment direction allows liquid crystals to be properly aligned in each domain while managing the boundary effects between domains to reduce luminance differences.
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 design enhances visibility by minimizing retardation differences between front and side views while maintaining light transmittance, thereby improving the overall performance of the display panel.
Implementation Method 1
formed using photoreactive materials and irradiation techniques to align liquid crystals across multiple domains
Implementation Method 2
Liquid crystal molecules of the liquid crystal layer are aligned by the first and second alignment layers to have directionality
Data Source
AI summary
A display substrate includes a first electrode and a first alignment layer disposed on the first electrode. The first alignment layer includes first and second alignment parts. The first electrode has a first opening portion formed therethrough. The first and second alignment parts are disposed at two sides of the first opening portion. The first and second alignment parts have the different alignment directions from each other.