LCD Opaque Conductive Pattern for Voltage Ripple Reduction
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Solution Overview
Problem
Liquid crystal display (LCD) devices driven in the Plane-to-Line Switching (PLS) mode suffer from crosstalk, decreased black luminance, and noise phenomena due to ripples in the common voltage, which are not effectively addressed by existing technologies.
Innovation Solution
The implementation of a black matrix that directly contacts the common electrode, reducing the number of mask processes and stabilizing the common voltage by forming an opaque conductive pattern on the common electrode to improve conductivity and reduce ripple components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional common electrode structure is used in PLS mode LCD devices, then the device can be manufactured with standard processes, but the common voltage exhibits ripples causing crosstalk, decreased black luminance, and noise phenomena
Solution Approach 1:
An opaque conductive pattern is introduced as an intermediary element between the common electrode and the pixel electrodes. This pattern serves as a mediator that redistributes the common voltage more uniformly across the display, eliminating the ripple effects that cause crosstalk and noise while maintaining the PLS driving mode functionality.
Solution Approach 2:
The opaque conductive pattern is strategically positioned in specific regions where voltage distribution needs improvement. By placing this conductive pattern only in necessary areas rather than uniformly across the entire common electrode, the design locally enhances voltage stability without requiring complete restructuring of the common electrode.
2Ease of manufacture
If the black matrix is separated from the common electrode, then each component can be formed with independent optimization, but the number of mask processes increases and manufacturing complexity rises
Solution Approach 1:
The black matrix and common electrode are merged into a single integrated structure. The opaque conductive pattern serves dual functions as both the black matrix (absorbing light at non-display areas) and as part of the common electrode (distributing common voltage). This merging eliminates the need for separate mask processes for forming these two components, simplifying manufacturing while maintaining their respective functions.
3Reliability
If the opaque conductive pattern is made highly conductive, then the common voltage stability improves and ripples are reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The design optimizes the parameters of the opaque conductive pattern, including its thickness, material composition, and geometric dimensions, to achieve the desired conductivity level. By carefully adjusting these parameters, the pattern provides sufficient electrical conductivity to stabilize common voltage without requiring extremely tight manufacturing tolerances that would be difficult to achieve in practice.
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 enhances the stability and uniformity of the common voltage, reducing crosstalk, improving black luminance, and minimizing noise phenomena in LCD devices.
Implementation Method 1
an opaque conductive pattern disposed on the common electrode
Implementation Method 2
a black matrix and a common electrode are placed in contact with each other
Data Source
AI summary
A liquid crystal display (LCD) device, comprising: a substrate, gate wiring including a gate line that is disposed on the substrate to extend in a first direction and a gate electrode that is connected to the gate line, a data conductor disposed on the gate wiring and including a data line that extends in a second direction different from the first direction, and a first electrode that overlaps the gate electrode, a common electrode disposed on the data conductor and including a first opening that partially exposes the first electrode therethrough, an opaque conductive pattern disposed on the common electrode; and a pixel electrode disposed on the opaque conductive pattern and electrically connected to the first electrode exposed through the first opening.