Dual-plate OLED Bus Line Rounded Corners Prevent Undercut Collapse
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Solution Overview
Problem
The existing dual-plate organic electroluminescent devices face issues with undercut collapse of barrier ribs onto bus lines, leading to short circuits and impaired device operation, particularly at corners where the barrier rib structure intersects with the bus line.
Innovation Solution
The design incorporates a bus line with rounded corners and barrier ribs that protrude over the bus line, forming a stable undercut structure with dummy layers to prevent collapse, ensuring electrical isolation and maintaining the integrity of the organic electroluminescent layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If barrier ribs are formed with undercut structure to separate pixel regions, then electrical isolation between adjacent pixels is improved, but undercut collapse onto bus lines occurs causing short circuits
Solution Approach 1:
A dummy layer is introduced as an intermediary structure between the barrier rib and the bus line. This dummy layer extends from the bus line toward the pixel region and positions the barrier rib to be formed on it, creating a stable support structure that prevents undercut collapse while maintaining electrical isolation between adjacent pixels.
Solution Approach 2:
The dummy layer is formed in advance before the barrier rib structure is created. By pre-positioning this support layer, the subsequent barrier rib formation process can proceed without causing undercut collapse, as the dummy layer provides a stable foundation that prevents the undercut from collapsing onto the bus line.
2Productivity
If barrier ribs are positioned to maximize pixel region area, then manufacturing efficiency is improved, but structural stability of undercut decreases
Solution Approach 1:
The dummy layer serves as a mediator that allows the barrier rib to be positioned optimally for maximizing pixel region area while providing the necessary structural support. The dummy layer's extension from the bus line creates a stable platform that prevents undercut collapse, enabling the barrier rib to maintain its position for maximum pixel area without compromising stability.
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 effectively prevents undercut collapse and short circuits, ensuring normal device operation by maintaining the separation between electrodes and bus lines, thereby enhancing the reliability and performance of the dual-plate organic electroluminescent device.
Implementation Method 1
The organic EL devices display a video image by exciting fluorescent materials using carriers, such as electrons and holes
Data Source
AI summary
A dual plate organic electro-luminescent device includes a first substrate and a second substrate having pixel regions, wherein the first substrate and the second substrate facing each other, a thin film transistor on the first substrate in each of the pixel regions, a first electrode on the second substrate, a bus line on the first electrode in regions other than the pixel regions such that the bus line has a round shape at each corner portion of each pixel region, barrier ribs on outside portions of the bus line so as to surround each of the pixel regions, an organic electro-luminescent layer on the first electrode in each of the pixel regions, a second electrode formed on the barrier rib and the organic electro-luminescent layer in each of the pixel regions, and a connection pattern connecting the thin film transistor and the second electrode.