Transparent OLED Passivation Apertures for Image Clarity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Organic light emitting display devices face image distortion due to light scattering through gaps between patterns of thin film transistors and wires, which are nearly at the wavelength of visible light, making them appear distorted when in an off-state.
Innovation Solution
The design includes a substrate with defined transmitting and pixel regions, where thin film transistors and pixel electrodes are covered by a passivation layer with apertures, and an organic emission layer between electrodes, allowing light to pass through while minimizing scattering by positioning conductive lines across pixel regions and using a high transmittance material for the transmitting regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thin film transistors and wires are placed in transmitting regions to enable device functionality, then the display can operate with necessary circuit elements, but light scattering occurs through gaps between patterns causing image distortion
Solution Approach 1:
The substrate is divided into distinct pixel regions and transmitting regions. By segmenting the display area, the patent allows transmitting regions to be free of patterns and gaps, eliminating light scattering in these areas while concentrating functional elements within pixel regions. This segmentation resolves the contradiction by spatially separating the harmful gaps from the transmitting areas.
Solution Approach 2:
The patent extracts and removes all patterns, conductive lines, and circuit elements from the transmitting regions, leaving them completely clear. By taking out these elements that cause light scattering, the transmitting regions achieve high optical quality without image distortion, while the extracted elements are relocated to pixel regions where they perform their functional roles.
2Illumination intensity
If pixel region area is reduced to enhance transparency, then overall transmittance improves, but maintaining display integrity and functionality becomes more difficult
Solution Approach 1:
The patent applies different quality requirements to different regions: pixel regions are optimized for display functionality with necessary patterns and elements, while transmitting regions are optimized for optical quality with no patterns or gaps. This local differentiation allows pixel regions to be small (enhancing transparency) while maintaining display integrity through proper design of the transmitting regions.
Solution Approach 2:
The patent introduces a spatial dimension by creating distinct zones across the substrate surface. By transitioning from a uniform structure to a zoned structure with separate pixel and transmitting regions, the patent enables small pixel areas (improving transmittance) while maintaining functionality through the dedicated transmitting regions that provide clear light paths.
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 prevents light scattering, maintains image clarity, and allows for a transparent display with reduced pixel region area, enhancing the overall transmittance and preventing image distortion, while maintaining the integrity of the display.
Implementation Method 1
an organic emission layer that is interposed between the plurality of pixel electrodes and the opposite electrode to emit light
Implementation Method 2
a substrate in which a plurality of transmitting regions and a plurality of pixel regions are defined
Data Source
AI summary
An organic light emitting display device that can prevent distortion of an image transmitted therethrough by preventing light scattering. The organic light emitting display device includes a substrate in which a plurality of transmitting regions and a plurality of pixel regions are defined. The plurality of pixel regions are spaced apart from each other by the transmitting regions. A passivation layer is formed in all the plurality of transmitting regions and the plurality of pixel regions. A first aperture is formed in a location on the passivation layer, which corresponds to an at least part of the plurality of transmitting regions; a plurality of pixel electrodes that are formed on the passivation layer and are disposed to overlap and cover the thin film transistors. An opposite electrode formed to face the plurality of pixel electrodes and to allow light to pass therethrough. An organic emission layer is interposed between the plurality of pixel electrodes and the opposite electrode to emit light.