Display Power-Line Layout for Early Defect Testing and Repair
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices face challenges in testing and repairing defects in transistors, connection electrodes, and interconnects, particularly due to the complexity of the manufacturing process which makes it difficult to drive and test the entire display area before completion.
Innovation Solution
The display device incorporates horizontal and vertical power voltage lines in different layers, with test lines positioned closer to the substrate and on a separate layer, allowing for testing and repair before the vertical power voltage lines are formed, enabling early detection and correction of defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire display area is tested before completion, then manufacturing yield and quality are improved, but the manufacturing process complexity increases
Solution Approach 1:
The patent implements preliminary testing by forming test lines before the vertical power voltage lines are formed. This allows the display area to be tested early in the manufacturing process, enabling defect detection and repair before subsequent manufacturing steps, thereby improving manufacturing yield without requiring complete device assembly
Solution Approach 2:
The patent segments the testing function from the final device structure by creating dedicated test lines that are separate from the operational pixel circuits. These test lines are positioned in peripheral areas and can be accessed independently, allowing testing to be performed on specific regions without affecting the entire display array
2Ease of repair
If test lines are positioned closer to the substrate, then ease of repair is improved, but device complexity increases
Solution Approach 1:
The patent utilizes the vertical dimension by positioning test lines on different layers from the vertical power voltage lines. Specifically, test lines are placed on layers closer to the substrate while vertical power lines are on upper layers. This layered arrangement provides vertical accessibility for testing and repair operations without interfering with the horizontal routing of power lines
Solution Approach 2:
The patent introduces insulating layers as intermediaries between the test lines and vertical power voltage lines. These insulating layers allow the test lines to be positioned closer to the substrate while maintaining electrical isolation from the power lines on upper layers, enabling repair accessibility without causing electrical interference
Data Source
AI summary
Provided are a display device and a method of manufacturing the same, wherein the display device includes a substrate which includes a display area including a subpixel and a peripheral area around the display area, horizontal power voltage lines which are disposed in the display area and extend in a first direction, vertical power voltage lines which are disposed in the display area, are positioned on a different layer from the horizontal power voltage lines, extend in a second direction, and are electrically connected to the horizontal power voltage lines, and test lines which are disposed in the peripheral area, are positioned in a different layer from the vertical power voltage lines, are positioned to be closer to the substrate than the vertical power voltage lines, extend in the second direction, and are electrically connected to the horizontal power voltage lines.