Double-Sided Transparent OLED Layout With Shared Drivers and Shielding
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Solution Overview
Problem
Double-sided emissive transparent organic light-emitting diode displays face challenges in achieving high brightness and aperture ratio, especially in outdoor environments with high ambient light, due to limitations in structural properties and driving element placement.
Innovation Solution
The display incorporates a substrate with both top and bottom light-emitting areas within a pixel, featuring top-emissive and bottom-emissive organic light-emitting diodes, where driving elements for both are placed under the top-emissive diode, and a shielding layer is used to stabilize the bottom-emissive diode's driving elements, enhancing aperture ratio and brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If driving elements for both top-emissive and bottom-emissive OLEDs are placed separately on opposite sides, then each OLED can be driven independently, but the aperture ratio decreases due to occupied space on both sides
Solution Approach 1:
The patent combines both top driving elements and bottom driving elements on the same side (first side) of the substrate. The bottom driving elements are positioned in a first region while top driving elements are positioned in a second region, both on the first side. This merging approach eliminates the need for separate driving element placements on opposite sides, thereby increasing the aperture ratio while maintaining independent driving capability through spatial separation within the same side.
Solution Approach 2:
The patent transitions from a one-dimensional arrangement (driving elements on opposite sides along one dimension) to a two-dimensional arrangement (driving elements distributed across different regions on the same side). This dimensional change allows both top and bottom OLEDs to be driven independently while maximizing the transparent area, as the driving elements occupy different spatial zones rather than competing for opposite sides.
2Area of stationary object
If more driving elements are placed on one side to increase aperture ratio, then the aperture ratio increases, but the driving elements may be affected by light from the opposite OLED reducing stability
Solution Approach 1:
The patent divides the pixel area into distinct regions: a first region for bottom driving elements, a second region for top driving elements, a third region for the bottom-emissive OLED, and a fourth region for the top-emissive OLED. This segmentation ensures that driving elements are spatially separated from opposite OLEDs, preventing light interference while maintaining high aperture ratio. The segmented layout allows dense packing of driving elements on one side without compromising stability.
Solution Approach 2:
The patent introduces a shielding layer as an intermediary between the driving elements and the opposite OLED. This shielding layer blocks light from the OLED from reaching the driving elements, preventing interference and ensuring stable driving characteristics. The intermediary structure enables the placement of multiple driving elements on one side without sacrificing reliability.
3Quantity of substance
If transparent materials are used throughout the display structure, then transparency is achieved, but the brightness and structural stability decrease
Solution Approach 1:
The patent applies different material properties to different regions: transparent materials are used in regions requiring transparency (substrate, encapsulation layers, insulating films), while reflective or light-emitting materials are used in light-emitting regions (OLED structures, electrodes). This local differentiation allows the display to maintain overall transparency while achieving high brightness in emitting areas, resolving the contradiction between transparency and brightness.
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 increases the aperture ratio and provides stable driving characteristics, enabling high brightness and transparency both when in use and not in use, effectively addressing the challenges of ambient light and structural limitations.
Implementation Method 1
organic light-emitting diode displays... self-emissive elements... top light-emitting area including: a top-emissive organic light-emitting diode, a plurality of bottom driving elements under the top-emissive organic light-emitting diode
Data Source
AI summary
A double-sided emissive transparent organic light-emitting diode display and method of manufacturing the same are provided. A double-sided emissive transparent organic light-emitting diode display includes: a substrate, a plurality of pixel areas, each including, on the substrate: a light transmitting area, and a light-emitting area, the light-emitting area including: a bottom light-emitting area including a bottom-emissive organic light-emitting diode, and a top light-emitting area including: a top-emissive organic light-emitting diode, a plurality of bottom driving elements under the top-emissive organic light-emitting diode, the bottom driving elements being configured to drive the bottom-emissive organic light-emitting diode, and a plurality of top driving elements under the top-emissive organic light-emitting diode, the top driving elements being configured to drive the top-emissive organic light-emitting diode.