Electro-Optical Pixel Structure With Recessed Capacitor Shielding
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Solution Overview
Problem
Conventional electro-optical devices face challenges in suppressing the lowering of numerical aperture while increasing capacitance value, leading to compromised display quality due to complex light shielding configurations that can destabilize transistor operations.
Innovation Solution
The electro-optical device incorporates a substrate with recessed portions, a laminated film structure including conductive and dielectric layers, and a semiconductor film with source, channel, and drain regions, where the semiconductor film overlaps the recessed portion, enhancing light shielding and capacitance without the need for multiple capacitance elements, thus simplifying the configuration and improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple capacitance elements are provided for each pixel to increase capacitance value, then capacitance value is improved, but device complexity increases and light shielding becomes complicated
Solution Approach 1:
The patent introduces a recessed portion extending in the thickness direction (third direction) to form a capacitance element. This vertical arrangement in the thickness direction allows the capacitance element to be disposed below the transistor, utilizing the Z-dimension rather than expanding in the planar X-Y directions. This dimensional transition resolves the contradiction by increasing capacitance value without complicating the planar configuration.
Solution Approach 2:
The capacitance element is nested within the recessed portion of the substrate, with the laminated film structure (conductive film, dielectric film, second conductive film) positioned inside the recess. This nesting arrangement allows the capacitance element to be integrated into the substrate structure itself, reducing overall device complexity while maintaining increased capacitance value.
2Quantity of substance
If multiple capacitance elements are provided for each pixel to increase capacitance value, then capacitance value is improved, but numerical aperture decreases
Solution Approach 1:
By transitioning to a vertical arrangement in the thickness direction, the capacitance element is positioned below the transistor in the Z-dimension. This allows the planar area occupied by capacitance elements to be minimized, preserving more light transmission area in the X-Y plane and thus maintaining higher numerical aperture while still achieving increased capacitance value through the vertical stacking.
Solution Approach 2:
The capacitance element is segmented into distinct functional layers (laminated film with conductive and dielectric layers) positioned in the recessed portion. This segmentation allows the capacitance function to be separated from the light transmission path, enabling increased capacitance without blocking light and thus preserving numerical aperture.
3Object-affected harmful factors
If complex light shielding configuration is used to prevent light intrusion to transistor, then light shielding is improved, but device complexity increases and display quality decreases
Solution Approach 1:
The light shielding function is extracted and integrated into the recessed portion structure itself. The recessed portion, combined with the laminated film, naturally shields the transistor from light intrusion by positioning the capacitance element below the transistor in the thickness direction. This eliminates the need for separate complex light shielding configurations, reducing device complexity while maintaining effective light shielding.
Solution Approach 2:
The recessed portion structure serves multiple functions simultaneously: it houses the capacitance element to increase capacitance value, provides light shielding to prevent light intrusion to the transistor, and maintains a simplified configuration. This multi-functionality resolves the contradiction by achieving effective light shielding without increasing device complexity.
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 increases capacitance value while maintaining high light shielding properties, thereby enhancing display quality by reducing light intrusion and stabilizing transistor operations, and simplifying the manufacturing process.
Implementation Method 1
a light shielding film having a light shielding property
Implementation Method 2
a first insulating film having a light transmissivity... a second insulating film having a light transmissivity
Data Source
AI summary
Provided is an electro-optical device including: a substrate having a recessed portion that extends in a first direction; a laminated film having a first conductive film, a dielectric film, and a second conductive film; a first insulating film; a light shielding film; a second insulating film; and a semiconductor film including a source region, a channel region, and a drain region that are disposed in this order in the first direction, wherein the laminated film, the first insulating film, the light shielding film, the second insulating film, and the semiconductor film are disposed in this order from the substrate side, and the semiconductor film overlaps with the recessed portion and is disposed along the recessed portion as viewed in plan view.