AMOLED Display With External TFT Driving Circuit
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Solution Overview
Problem
Current active-matrix OLED (AMOLED) displays face limitations in achieving high resolution and brightness due to integration with thin-film transistor (TFT) substrates, which restricts their ability to meet requirements for next-wave applications like virtual reality, augmented reality, and 3D volumetric holography, and also suffer from performance degradation due to noise and transparency issues.
Innovation Solution
The AMOLED design separates the TFT from the OLED, with the TFT integrated into ICs or other devices outside the active area, using a polyimide or ultra-thin glass substrate and a driving device configured to drive the OLED without being integrated within the active area, allowing for higher resolution and brightness by eliminating noise and enhancing transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If TFT is integrated within the active area of AMOLED, then the device can be manufactured with conventional processes, but the resolution and brightness are limited and cannot meet next-wave application requirements
Solution Approach 1:
The patent segments the AMOLED structure by separating the TFT driving device from the OLED active display area. The TFT is positioned in a non-active area region, allowing the active area to be dedicated entirely to high-resolution OLED pixels without TFT interference, thereby achieving resolutions beyond 1000 ppi while maintaining manufacturability through region-specific optimization
Solution Approach 2:
The patent utilizes the substrate's surface area in a dimensional sense by placing the TFT in a non-active area region adjacent to the active area. This spatial arrangement in the planar dimension allows both TFT and OLED to coexist without overlapping, enabling high resolution in the active area while accommodating driving functions elsewhere on the substrate
2Reliability
If TFT is integrated within the active area, then the device structure is compact, but noise and transparency issues cause performance degradation
Solution Approach 1:
The patent extracts the TFT driving device from the active display area and relocates it to a non-active area region. This separation removes the source of noise and transparency interference from the active area, allowing the OLED to achieve superior display performance with brightness exceeding 1,000,000 nits without TFT-related degradation
Solution Approach 2:
The patent introduces a non-active area region as an intermediary space between the active display area and the TFT driving device. This intermediary region acts as a buffer zone that electrically and physically separates the TFT from the active OLED pixels, eliminating noise coupling and transparency issues while maintaining functional integration
3Illumination intensity
If TFT is integrated within the active area, then the manufacturing process is simplified, but brightness and resolution requirements for VR/AR applications cannot be met
Solution Approach 1:
The patent divides the substrate into distinct functional regions: an active area for high-brightness OLED display and a non-active area for TFT driving functions. This segmentation allows the active area to be optimized for maximum brightness (>1,000,000 nits) without TFT constraints, while the non-active area accommodates the TFT manufacturing process, thereby meeting VR/AR requirements without sacrificing manufacturability
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 design enables AMOLED displays to achieve resolutions beyond 1,000 ppi and brightness exceeding 1,000,000 nits, addressing the limitations of existing technologies and meeting the demands of advanced applications while maintaining high performance and transparency.
Implementation Method 1
an organic light-emitting diode (OLED) device disposed on the first substrate
Data Source
AI summary
An AMOLED free of TFT in the active area includes a first substrate; an organic light-emitting diode (OLED) device disposed on the first substrate; a plurality of conductive lines disposed on the first substrate; and connected to the OLED device; and a driving device having TFT functions, connected to the OLED device through the conductive lines, configured to drive the OLED device, and disposed outside of the active area.