Transparent OLED Display Segregating Sensing Lines to Preserve Emission Area
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Solution Overview
Problem
Existing ultra high density transparent organic light emitting diode displays face challenges in maintaining high aperture ratio and video quality due to pixel defects and the reduction in emission area caused by compensation elements, especially in high resolution displays like UHD or 4K, and the need for unique features in transparent displays.
Innovation Solution
The implementation of a transparent organic light emitting diode display structure with a compensation thin film transistor that detects pixel degradation, maximizing the emission area and aperture ratio by separating the transparent area from the pixel area, and strategically placing the sensing line to avoid interference from frequently changing data voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If compensation elements are added to detect and compensate pixel defects, then video quality is improved, but the emission area and aperture ratio are reduced
Solution Approach 1:
The patent divides the display area into distinct pixel areas and transparent areas. Compensation elements (sensing lines, sensing transistors) are segregated into specific regions rather than being distributed throughout the entire pixel area. This segmentation allows compensation functionality to be implemented while preserving the emission area of OLEDs, as the sensing elements occupy minimal space in the transparent region rather than intruding into the light-emitting pixel areas.
Solution Approach 2:
The patent introduces sensing lines and sensing transistors as intermediary elements that detect pixel defects without directly interfering with the OLED emission process. These sensing elements act as mediators between the pixel circuitry and the control system, enabling defect detection and compensation while maintaining the integrity and emission area of the OLED structures through indirect monitoring rather than direct intervention in the emission path.
2Measurement precision
If pixel density is increased for ultra high resolution displays, then resolution is improved, but the gaps between lines are reduced causing interference and video quality degradation
Solution Approach 1:
The patent positions sensing lines as intermediary elements between the data lines and the OLEDs, strategically located in the transparent area. This intermediary positioning allows the sensing lines to detect pixel defects without being directly exposed to the rapidly switching voltages on data lines, thereby reducing capacitive coupling and interference. The sensing lines act as buffers that isolate the defect detection function from the high-frequency data signaling, enabling ultra-high resolution displays to maintain video quality despite reduced line spacing.
3Device complexity
If the sensing line is placed close to data lines for compact design, then device complexity is reduced, but interference from data voltages increases
Solution Approach 1:
The patent applies local quality by creating distinct functional zones within the display structure. The transparent area serves as a specialized region with different electrical characteristics and component density compared to the pixel areas. Sensing lines are localized to this transparent zone where they can operate with different spacing requirements than in the pixel regions. This local differentiation allows compact overall design while providing interference-free zones for sensitive sensing operations near data lines.
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 solution ensures superior video quality and high aperture ratio by maximizing the emission area and minimizing the impact of pixel defects, even as pixel density increases and gaps between lines narrow, thereby maintaining video quality and aperture ratio in ultra high density displays.
Implementation Method 1
The organic light emitting diode radiates the lights due to the energy from the excition formed at the excitation state in which the hole and the electron are recombined at the emission layer EML
Data Source
AI summary
The present disclosure relates to an ultra high density transparent flat panel display. The present disclosure provides a transparent flat panel display including: a driving current line, a data line and a sensing line running in a vertical direction on a substrate; a scan line and a horizontal sensing line running in a horizontal direction on the substrate; an emission area disposed between the driving current line and the data line; and a transparent area disposed between the data line and the sensing line.