Diagonal Common Line Capacitor for LCD Light Leakage Reduction
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Solution Overview
Problem
Conventional LCD devices experience light leakage due to fringe fields caused by protruding alignment layers over storage capacitors, leading to incorrect liquid crystal orientation and reduced display contrast.
Innovation Solution
The pixel structure is redesigned with a common line configuration that includes connector portions and a specific alignment direction for the alignment layer, making the alignment direction substantially perpendicular to the extending direction of the capacitor portion, effectively eliminating or reducing light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the common line includes a capacitor portion that extends in a conventional direction, then the storage capacitor can be formed with the pixel electrode, but the alignment layer protrudes over the capacitor portion causing fringe fields and light leakage
Solution Approach 1:
The capacitor portion of the common line is configured to extend in a direction substantially perpendicular to the alignment direction of the alignment layer, creating an asymmetric relationship between the capacitor orientation and alignment layer orientation. This asymmetric configuration prevents the alignment layer from protruding over the capacitor portion, thereby eliminating fringe fields and light leakage while maintaining storage capacitor functionality.
2Ease of manufacture
If the alignment layer covers the capacitor portion of the common line, then the pixel structure is complete, but the alignment layer protrudes higher causing incorrect liquid crystal orientation
Solution Approach 1:
The design creates a local quality difference by orienting the capacitor portion perpendicular to the alignment direction, ensuring that the alignment layer does not protrude over the capacitor portion in specific regions. This localized configuration maintains proper liquid crystal orientation precision while preserving the overall completeness of the pixel structure.
3Area of moving object
If the capacitor portion extends parallel to the alignment direction, then the storage capacitor area is maximized, but fringe fields cause light leakage at the capacitor edges
Solution Approach 1:
The capacitor portion is pre-configured to extend perpendicular to the alignment direction before liquid crystal alignment occurs. This preliminary anti-action prevents the formation of fringe fields at the capacitor edges by ensuring the alignment layer does not protrude over the capacitor portion, thereby preventing light leakage while maintaining adequate storage capacitor area.
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 design enhances display contrast and overall display effect by aligning liquid crystal molecules correctly, reducing light leakage at storage capacitors.
Implementation Method 1
an alignment layer is also disposed on the substrate and covers the aforementioned elements... the alignment direction of the alignment layer is substantially perpendicular to the extending direction of the capacitor portion
Implementation Method 2
the overlapped part of the pixel electrode and the capacitor portion forms a storage capacitor
Data Source
AI summary
A pixel structure to be disposed on a substrate is provided. The pixel structure includes a common line having a capacitor portion, an active device, a pixel electrode electrically connected to the active device and covering the capacitor portion, and an alignment layer covering at least the common line. The alignment layer has an alignment direction and the capacitor portion extends along a first direction that is substantially perpendicular to the alignment direction.