Liquid Crystal Display Electrode Spacing Control
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Solution Overview
Problem
Conventional liquid crystal display devices face limitations in controlling liquid crystal molecules due to fixed electrode distances and insulating film thicknesses, which restrict the flexibility in setting the interval between electrodes and applying an optimal electric field.
Innovation Solution
A semiconductor device and liquid crystal display device structure where a first electrode is formed over a substrate, with multiple insulating films and conductive films in between, allowing for an increased interval between the first and second electrodes, enabling flexible adjustment of the electric field gradient.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the thickness of the insulating film between electrodes is increased to allow greater electrode interval, then the degree of freedom in setting electrode interval is improved, but the current drive capability of the transistor is decreased
Solution Approach 1:
The patent divides the insulating film structure into multiple separate layers (first insulating film, second insulating film, third insulating film) between the first electrode and second electrode. This segmentation allows the total insulating thickness to be increased for greater electrode spacing while each individual layer maintains thicknesses that do not adversely affect transistor performance. The gate insulating film is separated from the electrode insulating films, allowing independent optimization of each layer's thickness for its specific function.
Solution Approach 2:
The patent introduces additional spatial dimensions by stacking multiple insulating films in series between the electrodes. Instead of using a single thick insulating layer, the structure extends the insulating path through multiple layers (first insulating film over first electrode, second insulating film over semiconductor film, third insulating film over conductive film), effectively increasing the electrode interval in the vertical dimension while maintaining acceptable individual layer thicknesses.
2Adaptability or versatility
If multiple insulating films and conductive films are added to increase electrode interval, then the flexibility in setting electric field gradient is improved, but the device structure becomes more complex
Solution Approach 1:
The patent designs the multi-layer structure where each layer serves multiple functions. The first insulating film provides both electrical insulation and structural support for the semiconductor film. The second insulating film serves as both insulation and as a base for the conductive film. The third insulating film provides final insulation before the second electrode. This multi-functionality reduces the need for additional specialized layers, thereby limiting the increase in structural complexity while achieving the goal of increased electrode interval and flexible electric field control.
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 degree of freedom in setting the interval between electrodes, allowing for an optimal electric field to be applied, which improves the viewing angle by effectively controlling liquid crystal molecules aligned parallel to the substrate.
Implementation Method 1
An electric field is applied between the pixel electrode and the common electrode, so that the liquid crystals are controlled
Data Source
AI summary
By increasing an interval between electrodes which drives liquid crystals, a gradient of an electric field applied between the electrodes can be controlled and an optimal electric field can be applied between the electrodes. The invention includes a first electrode formed over a substrate, an insulating film formed over the substrate and the first electrode, a thin film transistor including a semiconductor film in which a source, a channel region, and a drain are formed over the insulating film, a second electrode located over the semiconductor film and the first electrode and including first opening patterns, and liquid crystals provided over the second electrode.