Stacked Display Electrode Alignment via Intermediate Connection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge in manufacturing self-luminous display apparatuses lies in accurately aligning and electrically connecting electrodes of stacked substrates, which is inefficient due to yield differences in substrate fabrication steps and misalignment issues, affecting the display's emission lifetime and color consistency.
Innovation Solution
The solution involves a display apparatus configuration where a drive circuit substrate and a light-emitting substrate are stacked with an intermediate electrode connected to the light-emitting unit, allowing for misalignment tolerance in the connection electrode's position, using an elongated intermediate electrode that overlaps bus bars and pixel electrodes, ensuring reliable electrical contact and improved alignment accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the active matrix substrate and counter substrate are fabricated to be sequentially stacked, then the manufacturing process is simpler, but the efficiency is considerably poor because the efficiency depends on the step having a low yield
Solution Approach 1:
The patent divides the manufacturing process into two independent stages: fabricating the active matrix substrate and fabricating the counter substrate with pixel electrodes, which can be done simultaneously in separate production lines. This segmentation allows each substrate to be manufactured independently at high yield, avoiding the bottleneck of sequential stacking where overall efficiency depends on the lower-yield step.
2Productivity
If the active matrix substrate and counter substrate are fabricated to be stacked to each other, then the efficiency is not easily influenced by the step having a low yield, but it is very difficult to accurately align electrodes of the substrates and electrically connect the electrodes to each other
Solution Approach 1:
The patent incorporates alignment marks on both the active matrix substrate and counter substrate before the stacking process. These pre-formed alignment marks enable precise positioning and alignment of the pixel electrodes with the scanning and signal electrode lines during the stacking operation, ensuring accurate electrical connection without compromising manufacturing efficiency.
3Device complexity
If conventional connection methods are used to electrically connect the pixel electrodes, then the structure is simpler, but the emission lifetime is short and display fluctuations occur due to misalignment and connection reliability issues
Solution Approach 1:
The patent introduces an intermediate layer or intermediate structure between the pixel electrodes of the counter substrate and the scanning/signal electrode lines of the active matrix substrate. This intermediate connection structure acts as a mediator that accommodates misalignment and provides multiple contact points, thereby improving connection reliability, extending emission lifetime, and reducing display fluctuations without significantly increasing overall device complexity.
Data Source
AI summary
There is provided a display apparatus configured by stacking a drive circuit substrate and a light-emitting substrate. Electrodes of the substrates are accurately aligned to be electrically connected to each other. A display apparatus is configured by stacking a drive circuit substrate having a drive circuit and a light-emitting substrate having a light-emitting unit including a pixel electrode to cause the drive circuit substrate and the light-emitting substrate to face each other, wherein on a stacked plane between the drive circuit substrate and the light-emitting substrate, an intermediate electrode connected to the light-emitting unit of the light-emitting substrate and a connection electrode connected to the drive circuit and the drive circuit substrate are electrically connected to each other, and the intermediate electrode is elongated in a direction parallel to or perpendicular to a longitudinal direction of the pixel electrode on the stacked plane.