Pixel Electrode Lamination Film Wavelength Dispersion
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Solution Overview
Problem
The formation of a pixel electrode using a lamination film with a refractive index adjusting dielectric film between transparent conductive films in electro-optical devices leads to wavelength dispersion and requires high drive voltages, making it difficult to properly drive the liquid crystal layer.
Innovation Solution
Incorporating a light shading layer between the substrate and the pixel electrode, with a connection section that overlaps the light shading layer, to connect the first and second transparent conductive films and apply the same potential, reducing the need for high drive voltages and minimizing light passage through the connection section.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a pixel electrode is formed using a lamination film with a refractive index adjusting dielectric film between transparent conductive films, then wavelength dispersion is suppressed, but the second transparent conductive film enters a potentially-float state requiring high drive voltages
Solution Approach 1:
The pixel electrode is divided into multiple transparent conductive films (first and second transparent conductive films) with a refractive index adjusting dielectric film between them. This segmentation allows each layer to serve specific functions: the first film provides conductivity, the dielectric film adjusts refractive index to suppress wavelength dispersion, and the second film provides additional conductivity while being electrically connected through the light shading layer connection section.
Solution Approach 2:
The light shading layer with its connection section acts as an intermediary element that provides electrical connection between the first and second transparent conductive films. The connection section specifically connects these films in a location that overlaps the light shading layer, serving as a mediator that resolves the electrical connectivity issue while minimizing optical interference.
2Reliability
If the connection section is provided in an area overlapping the light shading layer, then electrical connection is achieved, but light passage may be reduced
Solution Approach 1:
The light shading layer is designed with spatially varying properties: it has a connection section with specific electrical conductivity in the region overlapping the pixel electrode, and a light shading section with optical shielding properties in other regions. This local differentiation allows the connection section to provide reliable electrical connection while the light shading section maintains proper light blocking function.
Solution Approach 2:
The light shading layer serves multiple functions simultaneously: it provides electrical connection through the connection section between transparent conductive films, it shades light in the pixel electrode region, and it defines the pixel electrode area. This multi-functionality resolves the contradiction by making a single structure serve both electrical and optical purposes.
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 suppresses wavelength dispersion, allows proper driving of the liquid crystal layer without high drive voltages, and reduces light passage through the pixel electrode, enhancing the electro-optical device's performance and productivity.
Implementation Method 1
if wavelength dispersion occurs when light passes through the common electrode, the quality of an image is deteriorated
Implementation Method 2
a refractive index adjusting dielectric film which is laminated on a side opposite to the substrate of the first transparent conductive film
Data Source
AI summary
In an electro-optical device, a pixel electrode includes a lamination film in which a first transparent conductive film, a refractive index adjusting dielectric film, and a second transparent conductive film are sequentially laminated. In the first transparent conductive film and the second transparent conductive film, projecting parts, which project from the end portion of the refractive index adjusting dielectric film, form a connection section. A data line, a scan line, and the like form a light shading layer which defines the transparent area of the pixel electrode, and the connection section is provided in an area which overlaps the light shading layer in planar view.