Nested Subpixel Electrodes for Liquid Crystal Display Transmittance
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Solution Overview
Problem
Liquid crystal displays with vertically aligned mode face challenges in maintaining image quality due to transmittance deterioration and crosstalk issues, especially when increasing size, as they require larger pixel electrodes to enhance storage capacitance, which reduces the aperture ratio.
Innovation Solution
The design includes a liquid crystal display with a first and second subpixel electrode on a substrate, where the second subpixel electrode surrounds the first, and storage electrodes are strategically placed to overlap specific stems of the electrodes, allowing for a voltage difference between them to control liquid crystal orientation and reduce parasitic capacitance, thereby minimizing transmittance loss and crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If one pixel is divided into two subpixels with different transmittance to improve side visibility, then lateral visibility is improved, but transmittance is reduced due to the gap between subpixels
Solution Approach 1:
The first subpixel electrode is nested within the second subpixel electrode, forming a concentric structure where the first subpixel electrode's stems and branches are positioned inside the region bounded by the second subpixel electrode. This nesting arrangement allows both subpixels to contribute to light transmission while minimizing the gap area, thereby improving transmittance while maintaining enhanced side visibility through the dual-subpixel configuration.
2Reliability
If the area of pixel electrode overlapping storage electrode is increased to increase storage capacitance, then storage capacitance is improved, but aperture ratio is reduced
Solution Approach 1:
The storage electrode is segmented into multiple regions: a first storage electrode overlapping the first horizontal stem, a second storage electrode overlapping the second vertical stem, and a third storage electrode overlapping the first vertical stem. This segmentation allows the storage capacitance to be distributed across multiple overlapping regions rather than requiring a single large overlapping area, thereby maintaining sufficient storage capacitance while preserving a higher aperture ratio.
Solution Approach 2:
The storage electrodes are positioned to overlap with the stems of the subpixel electrodes in a perpendicular dimension, creating three-dimensional overlapping regions. This dimensional arrangement allows storage capacitance to be enhanced through vertical stacking and strategic positioning rather than simply increasing the horizontal overlapping area, thus maintaining a high aperture ratio while achieving sufficient storage capacitance.
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 effectively prevents image quality deterioration from transmittance loss and crosstalk while allowing for improved lateral visibility comparable to front visibility, maintaining high contrast ratios and wide viewing angles.
Implementation Method 1
an orientation of liquid crystal molecules of the liquid crystal layer is determined and polarization of incident light is controlled based on the generated electric field to display an image
Implementation Method 2
The field generating electrodes are applied with a voltage to generate an electric field in the liquid crystal layer
Data Source
AI summary
A liquid crystal display includes: a first substrate; a reference voltage line including a storage electrode; a pixel electrode including a first subpixel electrode and a second subpixel electrode, and disposed in a pixel area; a second substrate facing the first substrate; and a liquid crystal layer provided between the first substrate and the second substrate, wherein the first subpixel electrode includes a first horizontal stem and a first vertical stem, the second subpixel electrode includes a second horizontal stem and a second vertical stem, the second subpixel electrode is provided to an external side of the pixel area to surround the first subpixel electrode, and the storage electrode includes a first storage electrode overlapping the first horizontal stem of the first subpixel electrode, and a second storage electrode overlapping the second vertical stem of the second subpixel electrodes.