Transparent Conductive Layer Stacking for Display Aperture Ratio
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Solution Overview
Problem
Liquid crystal display devices face challenges in improving the aperture ratio due to issues with wiring line layout, which affects the luminance and definition of the displays.
Innovation Solution
The design incorporates a semiconductor layer with a channel area between two areas, a gate electrode facing the channel area, and a pixel electrode structure with transparent conductive layers, including a color filter and organic insulating layers, to enhance the aperture ratio and definition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If wiring line layout is improved to increase aperture ratio, then luminance is improved, but wiring line layout complexity increases
Solution Approach 1:
The patent transitions from planar wiring layout to three-dimensional stacked wiring layers. Multiple transparent conductive layers (first, second, and third transparent conductive layers) are arranged vertically to create wiring paths in the thickness direction, allowing signals to be transmitted without occupying additional planar space. This dimensional transition enables increased aperture ratio while maintaining manageable wiring complexity through vertical integration rather than horizontal expansion.
2Illumination intensity
If aperture ratio is improved to increase luminance, then luminance is improved, but definition deteriorates due to wiring line layout
Solution Approach 1:
The patent applies different material properties to different regions of the pixel structure. Transparent conductive materials are used specifically in regions where light transmission is critical (pixel electrode areas), while opaque or reflective materials are used in wiring regions. The color filter layers are selectively positioned to provide local coloration only where needed for display pixels, leaving the pixel electrode areas transparent for maximum light transmission. This localized differentiation allows high aperture ratio and luminance while maintaining precise definition through selective material placement.
3Manufacturing precision
If pixel arrangement is made finer to increase definition, then definition is improved, but aperture ratio decreases
Solution Approach 1:
The patent compensates for the reduced planar aperture ratio caused by finer pixel arrangements by utilizing the thickness direction for wiring and signal transmission. The stacked transparent conductive layers enable electrical connections to be made vertically through the pixel structure rather than horizontally across the pixel surface. This allows the pixel opening area to be maximized in the planar view while wiring occupies the vertical dimension, effectively decoupling the trade-off between pixel density and aperture ratio that normally exists in planar designs.
Data Source
AI summary
According to one embodiment, a display device includes a semiconductor layer, a first insulating layer, a gate electrode, a second insulating layer, a third insulating layer, a color filter, and transparent conductive layers including a pixel electrode, a first conductive layer, and a second conductive layer. The first conductive layer is located between the second insulating layer and the third insulating layer, and is in contact with a second area of the semiconductor layer. The second conductive layer is located on the color filter and is in contact with the first conductive layer. The pixel electrode is located on the second conductive layer and is in contact with the second conductive layer.