Dual-Substrate OLED Device with Conductive Spacer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing organic electro luminescence devices face limitations in aperture ratio and resolution due to the formation of array elements and organic electro luminescent diodes on the same substrate, leading to defects and reduced yield, as well as restricted material selection for top emission types which degrades luminous efficiency.
Innovation Solution
The solution involves forming array elements and organic electro luminescent diodes on different substrates, with a conductive spacer electrically connecting the TFT on the first substrate to the second electrode on the second substrate, allowing for improved aperture ratio and resolution by separating the formation processes and enhancing material flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If array elements and organic electro luminescent diodes are formed on the same substrate, then device integration is achieved, but aperture ratio and resolution are limited and production yield decreases
Solution Approach 1:
The device is divided into two separate substrates: the first substrate contains array elements (TFTs) and the second substrate contains organic electro luminescent diodes. This segmentation allows each substrate to be optimized independently, enabling higher aperture ratio and resolution without compromising device integration. The conductive spacer serves as the connection interface between the two substrates.
2Device complexity
If array elements and organic electro luminescent diodes are formed on the same substrate, then device integration is achieved, but production yield and management efficiency are reduced
Solution Approach 1:
By segmenting the device into two separate substrates, the fabrication processes can be optimized and managed independently. This segmentation simplifies production management, reduces defects, and improves overall production yield while maintaining device integration through the conductive spacer connection.
3Shape
If top emission type structure is used with limited material selection, then emission direction is controlled, but luminous efficiency is degraded
Solution Approach 1:
The conductive spacer acts as an intermediary element that enables flexible material selection in the top emission type structure. By using the spacer as the connection interface, the patent overcomes material selection limitations and improves luminous efficiency while maintaining controlled emission direction through the second substrate.
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 approach enhances production yield and management efficiency, enables high aperture ratio and resolution, and increases the freedom in TFT design and material selection, resulting in more stable and efficient top emission type organic electro luminescence devices.
Implementation Method 1
a conductive spacer electrically connecting the TFT on the first substrate to the second electrode on the second substrate
Implementation Method 2
an organic electro luminescent layer in an emission region of each sub-pixel
Data Source
AI summary
An organic electro luminescence device includes: a display region and a non-display region defined in first and second substrates, sub-pixels defined in the display region; an array element including at least one TFT in the display region of the first substrate in each sub-pixel; a first electrode in an inner surface of the second substrate; a buffer in a predetermined region to partition an emission region of each sub-pixel on the first electrode, and an electrode separator on the buffer; an insulating layer in the emission region of each sub-pixel, and a spacer formed on the insulating layer; an organic electro luminescent layer in the emission region of each sub-pixel, the emission region including the insulating layer and the spacer; and a second electrode on the second substrate where the organic electro luminescent layer is formed.