Liquid Crystal Display Pixel Electrode Asymmetric Storage Capacitor
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Solution Overview
Problem
In liquid crystal display devices with stripe electrodes, irregular orientation of liquid crystal molecules due to leaking electric fields from storage capacitor lines leads to poor display quality, especially when voltage is not uniformly applied across the pixel electrodes.
Innovation Solution
The design includes pixel electrodes with regional electrodes and stripe electrodes separated by distance, where storage capacitor lines are positioned to avoid parallel alignment with the edges of the regional electrodes, and additional wiring sections that intersect with the storage capacitor lines to control the orientation of liquid crystal molecules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If storage capacitor lines are positioned parallel to the edges of pixel electrodes to simplify layout, then manufacturing ease is improved, but liquid crystal molecule orientation becomes irregular due to leaking electric fields
Solution Approach 1:
The storage capacitor line is intentionally positioned asymmetrically relative to the pixel electrode edges. Specifically, the line is arranged to be closer to one edge than to the opposite edge, breaking the symmetric parallel alignment that causes uniform leaking electric fields. This asymmetric positioning disrupts the uniformity of the electric field distribution, thereby preventing irregular orientation of liquid crystal molecules while maintaining layout simplicity.
2Reliability
If voltage is applied across pixel electrodes for polymer sustained alignment, then alignment is achieved, but non-uniform voltage distribution causes irregular molecule orientation
Solution Approach 1:
The patent applies local quality by creating non-uniform electric field distribution through strategic positioning of storage capacitor lines. Different regions of the pixel electrode experience different electric field strengths and directions, which locally adjusts the orientation of liquid crystal molecules. This local variation in electric field quality ensures that molecules throughout the entire pixel area, including edge regions, achieve uniform and stable alignment rather than irregular orientation.
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 prevents irregular orientation of liquid crystal molecules, resulting in improved transmittance and reduced dark lines on the display, enhancing the overall display quality by ensuring uniform molecular alignment.
Implementation Method 1
an electric field E1 is generated which leaks from the storage capacitor line CSL into the gap between pixel electrodes 101
Implementation Method 2
causes liquid crystal molecules LCm around the storage capacitor lines CSL to orient toward the storage capacitor lines CSL under the influence of the leaking electric field E1
Data Source
AI summary
Disclosed is a liquid crystal display device of active matrix type. Each pixel electrode (1) includes either a single regional electrode (2) or two or more regional electrodes (2) which are electrically connected to each other. The or each regional electrode is provided with: a first electrode (cross-shaped electrode) (3) which has a pattern dividing a first region into a plurality of second regions (R1, R2, R3, and R4); and a plurality of stripe electrodes (4) which are provided in each of the second regions so as to extend from the first electrode and so as to be separated from each other by a distance. A storage capacitor line (CSL) is provided facing one of pixel electrodes (1) in a film thickness direction to form a storage capacitor. The storage capacitor line (CSL) is provided so as not to extend facing an edge (2e, 2e′) of a first region in the film thickness direction parallelly to the edge (2e, 2e′). The invention eliminates irregular orientation of liquid crystal molecules in polymer sustained alignment.