Transparent OLED Subpixel Connection Layout for Aperture Ratio
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Solution Overview
Problem
Transparent organic light emitting display devices face a challenge in increasing the aperture ratio of the light emitting portion without reducing the transmission portion, as these components are in a trade-off relationship, making it difficult to enhance the light emitting area without compromising the external light transmission.
Innovation Solution
The design includes subpixels with a light emitting portion and a transmission portion, where the light emitting portion features a driving transistor and an organic light emitting diode connected by an extension line, and the use of repair lines and connection patterns to maintain the aperture ratio while allowing for efficient light transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the light emitting portion area is increased, then the aperture ratio is improved, but the transmission portion area is reduced
Solution Approach 1:
The patent extends the connection between the driving transistor and organic light emitting diode from a planar connection to a three-dimensional structure using an extension line that goes through the transmission portion. This vertical/dimensional approach allows the light emitting portion to be larger without proportionally increasing the connection area in the plane, thereby improving aperture ratio while maintaining transmission portion area.
Solution Approach 2:
The extension line acts as an intermediary element that connects the driving transistor to the organic light emitting diode through the transmission portion. This intermediary structure allows electrical connection without requiring the light emitting portion to directly occupy space that would otherwise be used for transmission, resolving the trade-off between light emitting area and transmission area.
2Productivity
If the light emitting portion area is increased, then the display efficiency is improved, but the trade-off relationship with transmission portion makes it difficult to increase aperture ratio
Solution Approach 1:
The patent divides the connection structure into distinct segments: the driving transistor, the extension line, and the organic light emitting diode. This segmentation allows each component to be optimized independently - the extension line can be routed through the transmission portion without affecting the light emitting portion design, thereby improving display efficiency without proportionally increasing overall structural complexity.
Solution Approach 2:
By utilizing the vertical dimension and extending connections through the transmission portion in the z-direction, the patent allows the light emitting portion to expand in the plane without requiring proportional expansion of connection structures, thereby improving display efficiency while managing structural complexity.
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 improves the aperture ratio of the light emitting portion by approximately 20-30% compared to previous designs, maintaining the transmission portion's area effectively, thus enhancing the display's efficiency and performance.
Implementation Method 1
a light emitting portion and a transmission portion alternately arranged in a row along a first direction, the light emitting portion including a driving transistor and an organic light emitting diode connected to the driving transistor
Data Source
AI summary
A display device includes a plurality of subpixels each including a transmission portion and a light emitting portion on a substrate, wherein the light emitting portion includes a driving transistor and an organic light emitting diode connected to the driving transistor, and an extension line extending from a drain electrode of the driving transistor and a first electrode of the organic light emitting diode are connected to each other in the transmission portion.