In-Plane Switching LCD Auxiliary Common Line Aperture Ratio
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Solution Overview
Problem
In-plane switching mode liquid crystal display (IPS) devices face challenges with low aperture ratio and high manufacturing costs due to misalignment issues between substrates, which affect light transmittance and viewing angles.
Innovation Solution
The IPS mode LCD device design includes a lattice-shaped auxiliary common line and a double-layered structure for pixel and common electrodes, eliminating the need for a black matrix and reducing alignment margins, thereby increasing aperture ratio and simplifying manufacturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a black matrix is used to prevent light leakage in related art IPS mode LCD devices, then light leakage is reduced, but aperture ratio decreases and manufacturing complexity increases
Solution Approach 1:
The patent removes the black matrix component entirely from the display structure. Instead of using a black matrix to block light leakage, the invention relies on the lattice-shaped auxiliary common line structure and precise alignment margins to achieve the same light blocking function, thereby eliminating the need for additional light-blocking materials and increasing aperture ratio.
Solution Approach 2:
The auxiliary common line structure serves multiple functions simultaneously: it provides electrical connection for the common electrode, prevents light leakage through its lattice pattern, and eliminates the need for separate black matrix layers. This multi-functional design reduces manufacturing complexity and material usage while maintaining display performance.
2Manufacturing precision
If alignment margins are increased in related art IPS mode LCD devices, then substrate alignment precision is compensated, but aperture ratio decreases
Solution Approach 1:
The patent changes the geometric parameters of the auxiliary common line structure, specifically using a lattice shape with optimized spacing and width. This parameter optimization allows the structure to provide sufficient light blocking and alignment tolerance with minimal margin, thereby maximizing aperture ratio while maintaining manufacturing feasibility.
3Object-affected harmful factors
If multiple layers including black matrix and overcoat are used in related art IPS mode LCD devices, then light leakage is controlled, but manufacturing complexity and cost increase
Solution Approach 1:
The patent merges the functions of the black matrix, overcoat layer, and auxiliary common line into a single integrated lattice structure. This consolidation reduces the number of manufacturing steps, eliminates intermediate layers, and simplifies the overall fabrication process while maintaining effective light leakage control.
Solution Approach 2:
The invention removes unnecessary intermediate layers such as the overcoat layer that were traditionally used in conjunction with black matrices. By extracting these redundant components and relying on the lattice-shaped auxiliary common line alone for light blocking, the manufacturing process is simplified and material costs are reduced.
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 aperture ratio and transmittance while reducing manufacturing costs by minimizing light leakage and improving display quality with improved viewing angles and reduced material usage.
Implementation Method 1
uses optical anisotropy and polarization properties of liquid crystal molecules
Implementation Method 2
incident light is refracted based on the orientation of the liquid crystal molecules due to the optical anisotropy
Implementation Method 3
uses optical anisotropy and polarization properties of liquid crystal molecules
Implementation Method 4
Liquid crystal molecules of the liquid crystal layer 11 are driven by a horizontal electric field L, which is induced between the common and pixel electrodes 17 and 30
Data Source
AI summary
A liquid crystal display device includes first and second substrates and a liquid crystal layer interposed therebetween; a gate line, a data line and a common line over the first substrate in the display area; a thin film transistor connected to the gate line and the data line; a color filter layer over the thin film transistor; a first passivation layer over the color filter layer; an auxiliary common line, inner common electrodes and pixel electrodes over the first passivation layer, wherein the auxiliary common line includes a vertical portion and a horizontal portion, the inner common electrodes extend from the horizontal portion, and the pixel electrodes alternate the inner common electrodes; a light blocking pattern in the non-display area, wherein the light blocking pattern includes the same materials as the color filter layer.