Signal Line Storage Capacitance for LCD Aperture Ratio
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Solution Overview
Problem
Liquid crystal display devices using transverse electric fields face challenges in maintaining high display quality due to parasitic capacitance and electric field interference from signal lines, which can decrease pixel aperture ratio and affect image display.
Innovation Solution
Incorporating a storage capacitance element formed between neighboring signal lines, with electrodes opposed via an interlayer insulation film, to shield electric fields and reduce unwanted capacitance, thereby maintaining high display quality without decreasing pixel aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate storage capacitance line is disposed in the pixel section to shield electric fields, then display quality is improved, but pixel aperture ratio decreases
Solution Approach 1:
The invention merges the signal line and storage capacitance line into a single structure. The signal line serves dual functions: transmitting signal voltages to pixel electrodes and acting as one electrode of the storage capacitance element. This eliminates the need for separate storage capacitance lines while maintaining electric field shielding capabilities, thus preserving pixel aperture ratio without compromising display quality
Solution Approach 2:
The signal line is designed to perform multiple functions simultaneously: it acts as both a signal transmission conductor and an electrode for the storage capacitance element. By making the signal line universal, the invention eliminates redundant structures and maintains high pixel aperture ratio while still providing the necessary electric field shielding for display quality
2Reliability
If wiring for shielding electric fields is disposed in the pixel section, then display quality is improved, but device complexity increases
Solution Approach 1:
The invention combines the signal line and storage capacitance line into a single integrated structure, reducing the number of wiring elements in the pixel section. This merger simplifies the wiring structure while maintaining the electric field shielding function necessary for high display quality
Solution Approach 2:
The signal line is designed to serve dual purposes: signal transmission and electric field shielding through its role as a storage capacitance electrode. This multi-functionality reduces device complexity by eliminating the need for separate shielding wiring structures
3Object-affected harmful factors
If the pixel section area is reduced to accommodate separate storage capacitance lines, then parasitic capacitance is reduced, but productivity decreases
Solution Approach 1:
The invention merges the signal line and storage capacitance line into one structure, eliminating the need for separate storage capacitance lines. This reduces the area occupied by wiring in the pixel section, thereby reducing parasitic capacitance while maintaining high pixel aperture ratio and productivity
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 effectively suppresses parasitic capacitance and electric field interference, ensuring high display quality and increased pixel aperture ratio, while also reducing manufacturing costs by eliminating the need for separate storage capacitance lines.
Implementation Method 1
a pair of electrodes which are opposed via an interlayer insulation film
Implementation Method 2
suppress an unwanted parasitic capacitance
Implementation Method 3
liquid crystal molecules are switched by a transverse electric field
Implementation Method 4
the polarization state is not greatly influenced by the incidence direction
Data Source
AI summary
A liquid crystal display device, which is configured such that a liquid crystal layer is held between a pair of substrates, includes scanning lines extending in a row direction of matrix-arrayed pixels; and signal lines extending in a column direction of the pixels, wherein a pixel between a pair of ones of the signal lines, which neighbor in the row direction, includes, on an identical one of the pair of substrates, a first electrode which is connected to one of the pair of ones of the signal lines, and a second electrode which is opposed to the first electrode via an interlayer insulation film and is connected to the other of the pair of ones of the signal lines.