Transparent Display Pixel Stack for Higher Aperture Ratio
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Solution Overview
Problem
Transparent displays face a challenge in maintaining high transparency due to low aperture ratios of pixels, which affect display quality by allowing less background visibility from the opposite side.
Innovation Solution
The display device incorporates a specific layer structure including a conductive layer, insulating film, oxide semiconductor layer, and transparent conductive layers to enhance the aperture ratio by optimizing the arrangement and connection of these layers, allowing for improved light transmission and reduced light shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a conventional pixel structure is used in transparent displays, then the device complexity is reduced, but the aperture ratio is low which deteriorates transparency and display quality
Solution Approach 1:
The pixel structure is segmented into multiple functional layers including a first conductive layer, insulating film, oxide semiconductor layer, second conductive layer, planarization layer, and multiple transparent conductive layers. This segmentation allows each layer to be optimized for specific functions while collectively achieving high aperture ratio and transparency.
Solution Approach 2:
The patent transitions from a conventional single-layer conductive structure to a multi-layer stacked configuration, adding vertical dimensionality. The transparent conductive layers are arranged at different heights with openings that align vertically, creating a three-dimensional conductive network that enhances aperture ratio while maintaining electrical functionality.
2Quantity of substance
If the aperture ratio is increased to improve transparency, then background visibility is enhanced, but the manufacturing precision requirements increase due to the complex layer alignment
Solution Approach 1:
The planarization layer is selectively removed to form openings only in specific regions where transparent conductive layers need to be exposed and connected. This localized modification allows precise control over where light transmission occurs while maintaining the protective and planarizing functions of the layer in other regions.
Solution Approach 2:
The planarization layer is formed and patterned with openings before the transparent conductive layers are deposited. This preliminary preparation ensures that subsequent layers can be accurately positioned and connected through the pre-defined openings, reducing alignment complexity during manufacturing.
3Illumination intensity
If multiple transparent conductive layers are stacked to enhance aperture ratio, then light transmission is improved, but the device complexity increases
Solution Approach 1:
Multiple transparent conductive layers are merged into a single integrated conductive network through vertical alignment and electrical connection at the openings. The layers work together as a unified structure to enhance light transmission while maintaining a relatively simple overall device architecture.
Solution Approach 2:
The stacked transparent conductive layers serve multiple functions simultaneously: they provide electrical conduction, enhance light transmission through their transparent nature, create the aperture ratio by their selective placement and connection, and contribute to the overall structural integrity of the pixel.
Data Source
AI summary
A display device includes a first conductive layer, a first insulating film arranged on the first conductive layer, an oxide semiconductor layer arranged on the first insulating film, a second conductive layer arranged on the first insulating film and connected to the oxide semiconductor layer, a planarization layer arranged on the oxide semiconductor layer, a first transparent conductive layer in contact with the second conductive layer inside an opening in the planarization layer, and a second transparent conductive layer in contact with the first transparent conductive layer inside the opening.