Stacked Transistor Light Emitting Display for High Resolution
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Solution Overview
Problem
High-definition organic EL display devices face reduced pixel size, leading to decreased capacity for retaining potential differences, causing brightness variations and degraded display quality due to noise and leakage currents.
Innovation Solution
The use of multiple transistors with semiconductor portions in different layers, including a pixel transistor and a drive transistor, along with capacitor electrodes to stabilize potential differences across pixels, enhancing the capacity to retain voltage and improve display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If pixel size is reduced to achieve high definition, then display resolution is improved, but capacity for retaining potential difference is reduced
Solution Approach 1:
The patent transitions from a single-layer transistor structure to a multi-layer stacked transistor configuration. By stacking transistors in the vertical dimension, the device increases the effective capacitor area without increasing the horizontal pixel footprint, thereby maintaining potential difference retention capacity while reducing pixel size for high definition display.
Solution Approach 2:
The patent implements nested transistor structures where transistors are arranged in stacked layers with upper transistors positioned above lower transistors. The source/drain regions of upper transistors are nested above or adjacent to source/drain regions of lower transistors, creating a compact vertical arrangement that maximizes capacitor area within the constrained pixel area.
2Measurement precision
If pixel size is reduced to achieve high definition, then display resolution is improved, but display quality is degraded due to noise and leakage
Solution Approach 1:
By stacking transistors vertically in multiple layers, the patent increases the capacitor area without increasing horizontal pixel dimensions. This enhanced capacitor area improves the ability to retain potential differences, reducing the impact of noise and leakage currents on display quality while maintaining high definition resolution.
Solution Approach 2:
The multi-layer transistor structure with increased capacitor area acts as a buffer against potential difference variations caused by noise and leakage. The larger capacitor capacity provides a cushion that maintains stable voltage levels, preventing brightness variations and display quality degradation before they can occur.
3Reliability
If multiple transistors are added to control current, then potential difference retention is improved, but device complexity is increased
Solution Approach 1:
The patent combines multiple transistor functions into a stacked configuration where transistors share common structural elements such as source/drain regions and insulating layers. This merging approach increases potential difference retention capability while minimizing the increase in device complexity through shared components and integrated design.
Solution Approach 2:
The stacked transistor structure serves multiple functions simultaneously: it provides current control for the light emitting element, acts as a capacitor for potential difference retention, and maintains a compact form factor. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity.
Data Source
AI summary
A light emitting element display device includes light emitting elements that emit light by allowing a current to flow in a plurality of pixels arranged in a display area in a matrix, and at least two transistors that are arranged in each of the plurality of pixels, and control the current flowing in the light emitting elements, in which semiconductor portions of the at least two transistors are formed in layers different from each other.