Transparent Display Substrate Contact Relocation
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Solution Overview
Problem
Transparent display substrates based on electroluminescent devices face challenges with low transparency and poor luminous efficiency, as there is a trade-off between transparency and light-emitting area, making it difficult to achieve both high transparency and efficient light emission simultaneously.
Innovation Solution
A display substrate design with a base substrate having emission and transmission areas, where a thin film transistor and electroluminescent device are integrated, and a conductive member connects the electroluminescent device's electrode with the active layer, with the contact portion located in the transmission area, allowing for improved transparency and luminous efficiency without reducing the light-emitting area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light-emitting area is increased to improve luminous efficiency, then the luminous efficiency is improved, but the transparency of the display substrate deteriorates
Solution Approach 1:
The patent moves the contact portion of the conductive member from the emission area to the transmission area, utilizing the vertical dimension and spatial reconfiguration. This allows the light-emitting area to be maximized for high luminous efficiency while the contact portion is positioned in the transmission area where it does not interfere with light emission, thus maintaining substrate transparency.
Solution Approach 2:
The display substrate is divided into distinct functional areas: emission area for light emission and transmission area for transparency. The conductive member is segmented such that its contact portion with the active layer is located in the transmission area, separating the electrical connection function from the light emission function. This spatial segmentation resolves the contradiction by allowing each area to optimize its specific function.
2Reliability
If the contact portion of the conductive member is located in the emission area to ensure electrical connection, then the electrical connection is ensured, but the aperture ratio and transparency deteriorate
Solution Approach 1:
The contact portion is relocated to the transmission area, utilizing the spatial dimension and functional zone separation. This repositioning maintains reliable electrical connection between the conductive member and active layer while removing the contact portion from the light-emitting region, thereby preserving aperture ratio and transparency.
Solution Approach 2:
Different areas of the substrate are assigned different functional qualities: the emission area is optimized for light emission with high aperture ratio, while the transmission area handles electrical connections. The contact portion is placed in the transmission area where its presence does not compromise the local quality required for transparency and aperture ratio.
3Loss of energy
If transparent conductive material is used for the conductive member to improve transparency, then the transparency is improved, but the electrical conductivity may be insufficient
Solution Approach 1:
The conductive member is formed using composite material structure, combining transparent conductive oxide materials that provide both optical transparency and adequate electrical conductivity. This composite approach allows the conductive member to satisfy both transparency requirements and electrical connection reliability without compromising either property.
Data Source
AI summary
A display substrate, a method of manufacturing the same and a display device are provided. The display substrate includes: a base substrate including an emission area and a transmission area; an electroluminescent device on the base substrate, the electroluminescent device including a first electrode in the emission area; a thin film transistor for controlling the electroluminescent device, the thin film transistor including an active layer; and a conductive member on the base substrate. The conductive member electrically connects the first electrode of the electroluminescent device with the active layer, the conductive member includes a contact portion in contact with the active layer, and the contact portion is located in the transmission area.