Protrusion Electrode for Liquid Crystal Display Edge Control
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Solution Overview
Problem
In large-sized, high-resolution liquid crystal displays, the small pixel size leads to weak control over liquid crystal molecules at the edge portions, resulting in decreased transmittance and abnormal liquid crystal molecule alignment, which affects image quality and side visibility.
Innovation Solution
The implementation of a protrusion electrode protruding from the pixel electrode, specifically designed to overlap the data line and applied with a voltage, enhances the electric field control at the edge of the pixel, improving the alignment of liquid crystal molecules and maintaining high transmittance by differentiating the electric field intensities across the pixel regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pixel size is decreased to achieve large-sized high-resolution displays, then the display resolution is improved, but the control strength over liquid crystal molecules at edge portions becomes weak
Solution Approach 1:
The patent applies different voltage levels to different regions of the pixel electrode. Specifically, the pixel electrode is divided into a first region and a second region, where the first region (edge portion) is applied with a first voltage and the second region (center portion) is applied with a second voltage. This local differentiation compensates for the weak control at edge portions while maintaining appropriate control at center portions, thus resolving the contradiction between high resolution and sufficient control strength.
2Measurement precision
If the pixel size is decreased to achieve high resolution, then the display resolution is improved, but the transmittance at edge portions decreases due to abnormal liquid crystal molecule alignment
Solution Approach 1:
By applying different voltages to different regions of the pixel electrode, the patent achieves proper alignment of liquid crystal molecules at edge portions. This prevents the abnormal alignment that would otherwise cause dark portions and reduced transmittance, thereby maintaining high transmittance while achieving high resolution.
3Adaptability or versatility
If different voltages are applied to subpixels to approximate side visibility to front visibility, then the viewing angle is improved, but the device complexity increases
Solution Approach 1:
The pixel electrode is segmented into multiple regions (first region and second region) that can be applied with different voltages. This segmentation enables independent control of different areas within a pixel, allowing for improved viewing angle characteristics through differential voltage application while using a relatively simple electrode structure.
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 protrusion electrode effectively smooths the control of liquid crystal molecules at the edge of the pixel, preventing dark portions and maintaining high transmittance, thereby ensuring accurate gray-scale representation and improved side visibility compared to conventional designs.
Implementation Method 1
The liquid crystal display generates an electric field in the liquid crystal layer by applying voltages to the field generating electrodes, to determine orientations of liquid crystal molecules of the liquid crystal layer
Data Source
AI summary
A liquid crystal display includes: a first substrate; a gate line and a data line disposed on the first substrate; a thin film transistor connected to the gate line and the data line; a pixel electrode positioned on the first substrate, connected to the thin film transistor, configured to be applied with a first voltage, and including a first sub-pixel electrode including a first sub-region and a second sub-region and a second sub-pixel electrode configured to be applied with a second voltage; a protrusion electrode protruding from the pixel electrode to overlap the data line; and an insulating layer positioned on the first sub-region of the first sub-pixel electrode and positioned under the second sub-pixel electrode and the second sub-region of the first sub-pixel electrode, wherein the first sub-region of the first sub-pixel electrode overlaps the second sub-pixel electrode.