IPS LCD Curved Electrode Openings for Border Stability
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Solution Overview
Problem
Conventional IPS liquid crystal display panels with curved, stripe-patterned electrodes face issues with residual images and transmittance when depression pressure is applied, as the border between clockwise and counter-clockwise areas shifts, affecting viewing angle characteristics and transmittance.
Innovation Solution
A liquid crystal display device with a pixel structure featuring a pixel electrode and a common electrode, where the electrode closer to the liquid crystal layer has a stripe pattern with curved portions and the electrode farther away has a solid flat shape with independent dot openings at curved portions, allowing only the convex outline segment of each curved portion to pass through the openings, stabilizing the border between the two areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the electrode closer to the liquid crystal layer has a stripe pattern with curved portions to create clockwise and counter-clockwise areas, then viewing angle characteristics are improved, but the border between these areas shifts when depression pressure is applied, causing residual images and transmittance changes
Solution Approach 1:
A common electrode with openings is introduced as an intermediary element between the pixel electrode and the liquid crystal layer. The openings are positioned to overlap with the curved portions of the stripe-patterned pixel electrode, acting as a mediator to stabilize the electric field distribution and prevent border shifting while maintaining the viewing angle benefits of the curved electrode design
Solution Approach 2:
The common electrode is designed with non-uniform local properties through the strategic placement of openings. The openings are located specifically at the curved portions where the stripe direction changes, creating local variations in electric field distribution that stabilize the border between clockwise and counter-clockwise areas without affecting the overall electrode function
2Reliability
If openings are provided in the common electrode at curved portions, then the border stability is improved, but the electrode area is reduced which may affect transmittance
Solution Approach 1:
The common electrode is segmented by introducing openings at specific locations rather than maintaining a continuous solid structure. This segmentation allows the electrode to maintain electrical functionality while creating localized modifications that stabilize the electric field at curved portions without significantly reducing the overall electrode area
Solution Approach 2:
Openings are provided only at the curved portions of the electrode where they are most needed for stabilizing the border between clockwise and counter-clockwise areas, rather than throughout the entire electrode. This partial action minimizes the reduction in electrode area while achieving the desired stabilization effect
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 reduces residual images and maintains high transmittance while stabilizing the border between the clockwise and counter-clockwise areas, enhancing viewing angle characteristics and preventing transmittance changes.
Implementation Method 1
an electrode that is characterized by being shaped in a stripe pattern in plan view, and drives a liquid crystal layer by applying an electric field whose major components are parallel to the substrate plane (so-called lateral electric field) to the liquid crystal layer
Implementation Method 2
The liquid crystal layer in the IPS liquid crystal display panel has a homogeneous alignment, and an application of a lateral electric field causes an alignment change in which liquid crystal molecules rotate within the plane of the liquid crystal layer
Data Source
AI summary
Provided is a liquid crystal display device that includes a liquid crystal layer sandwiched between two substrates, one of which includes a pixel electrode and a common electrode, where the electrode that is disposed closer to the liquid crystal layer has a stripe pattern that includes a plurality of slip electrode portions, and each of the plurality of slip electrode portions includes a curved portion at which each of the plurality of the slip electrode portions changes a stretching direction, and where the other electrode has a solid flat shape provided with a plurality of openings at locations that overlap with the curved portions of the plurality of slip electrode portions, the plurality of openings being provided in a manner that makes the opening in one curved portion independent and that allows only a convex outline segment of the slip electrode portion to run through an area of the opening.