Transparent Wiring for See-Through OLED Aperture Ratio
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Solution Overview
Problem
Current organic light-emitting display devices lack the ability to simultaneously display images and allow recognition of an external background, limiting their functionality and user experience.
Innovation Solution
The design incorporates a substrate with a pixel region for image display and a transmission region for external light, featuring a transparent wiring that overlaps the transmission region, allowing for see-through functionality while compensating for voltage drops and improving aperture ratio by eliminating the need for low-resistance wiring in the transmission area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional organic light-emitting display device structure is used, then image display function is achieved, but see-through functionality is lost
Solution Approach 1:
The pixel structure is segmented into two distinct regions: a first region for image display containing pixel circuits and emitting structures, and a second region for light transmission free of opaque components. This segmentation enables the display device to simultaneously achieve image display functionality and see-through functionality by spatially separating these two functions within the same pixel structure.
2Reliability
If transparent wiring is added to the transmission region, then voltage drop compensation is improved, but manufacturing complexity increases
Solution Approach 1:
The transparent wiring layer is designed to serve multiple functions simultaneously: it provides voltage drop compensation in the transmission region, maintains electrical connectivity across the display device, and preserves optical transparency to enable see-through functionality. By integrating these multiple functions into a single component, the invention avoids increasing manufacturing complexity while achieving reliable voltage compensation.
3Area of stationary object
If the aperture ratio is increased in the transmission region, then light transmission is improved, but wiring requirements become more stringent
Solution Approach 1:
The wiring structure is designed with local quality differentiation: in the transmission region, transparent wiring with sufficient but not excessive conductivity is used to maintain transparency while providing adequate voltage compensation; in the emission region, conventional opaque wiring with high conductivity is used to ensure low resistance for driving the emitting structures. This localized optimization allows large transmission areas without compromising wiring reliability.
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 enables a see-through organic light-emitting display device with improved uniformity and aperture ratio, enhancing user experience by allowing simultaneous image display and external background recognition without the need for low-resistance wiring in the transmission region.
Implementation Method 1
The organic light-emitting display device is a self-luminous display device in which excitons generated while holes injected from the hole injection electrode and electrons injected from the electron injection electrode recombine in the organic emission layer fall down from an excited state to a ground state to emit light
Data Source
AI summary
An organic light-emitting display device includes: a substrate; a pixel disposed on the substrate and including a first region that displays an image and a second region that transmits external light; a pixel circuit portion disposed in the first region and including at least one thin film transistor and at least one capacitor; a first electrode disposed in the first region and electrically connected with the pixel circuit portion; a pixel-defining layer including a first opening that exposes a portion of the first electrode and a second opening that corresponds to the second region; a second electrode facing the first electrode; an organic emission layer disposed between the first electrode and the second electrode; and a transparent wiring electrically connected with the pixel circuit portion and overlapping the second opening in a plan view.