Transparent OLED Light Transmittance via Pixel Segmentation
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Solution Overview
Problem
Transparent organic light-emitting display devices suffer from low external light transmittance due to the presence of thin film transistors and wires, which obstructs the view of objects or images on the opposite side when the display is in a switch-off status.
Innovation Solution
The design incorporates a substrate with pixels having distinct emission and transmission regions, where the emission region is separated from the circuit region, and an anti-reflection layer is used to enhance external light transmittance by minimizing reflection and maximizing the area for light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If transparent thin film transistors and wires are included in the organic light-emitting display device to enable transparency, then the display can show external images, but light transmittance is reduced due to the presence of these components
Solution Approach 1:
The pixel structure is divided into a first region for light emission and a second region for light transmission. The thin film transistor and wire patterns are positioned in the first region, while the second region remains clear for external image viewing. This spatial segmentation allows the display to maintain both transparency functionality and high light transmittance in the viewing area.
2Reliability
If thin film transistors and wire patterns are placed in the pixel regions to enable device functionality, then the display can operate, but the space between wires is reduced and light transmittance decreases
Solution Approach 1:
The patent utilizes the vertical dimension by positioning the thin film transistor and wire patterns in specific layers and regions. The pixel circuit is configured so that functional components are stacked vertically or positioned in regions that do not obstruct the horizontal light transmission path, thereby maintaining device functionality while maximizing light transmittance.
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 significantly increases external light transmittance, reducing image distortion caused by internal device structures and allowing clear viewing of external images through the display when it is not in use.
Implementation Method 1
an anti-reflection layer located on at least one of a second side of the substrate or an outer side of the sealing member
Data Source
AI summary
An organic light-emitting display device includes: a substrate; pixels on a first side of the substrate, each of the pixels comprising a first region for emitting light and a second region for transmitting external light; pixel circuits on the first regions of the pixels, each of the pixel circuits comprising at least one thin film transistor; an insulating layer covering the pixel circuits; first electrodes on the insulating layer, spaced from each other on the first regions, and electrically connected to the pixel circuits; a second electrode opposite the first electrodes and formed throughout the first and second regions of all the pixels; an organic layer between the first electrodes and the second electrode; a sealing member facing the first side of the substrate; and an anti-reflection layer located on at least one of a second side of the substrate or an outer side of the sealing member.