Display Active Pattern Layout to Prevent Edge Disconnection
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Solution Overview
Problem
Display devices with light emitting diode (LED) technology face defects in the active pattern, leading to issues such as disconnection near the edges due to thickness differences, which affect the layout efficiency and output characteristics.
Innovation Solution
The design includes a substrate with a conductive layer and active layers where the conductive pattern overlaps the active pattern without overlapping its edges, preventing defects and improving the layout arrangement, and the active patterns are connected or spaced apart to enhance electrical connections and reduce current variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the conductive pattern is made thicker to improve electrical connection, then electrical conductivity is improved, but the thickness difference causes disconnection defects at the edges of the active pattern
Solution Approach 1:
The conductive pattern is designed with varying thickness: thicker in the central region overlapping the active pattern to ensure good electrical contact, and thinner or absent at the edges to avoid disconnection defects. This local variation in thickness optimizes both electrical connection reliability and manufacturing precision at different locations.
2Reliability
If the conductive pattern overlaps the entire active pattern to improve electrical connection, then conductivity is improved, but layout efficiency deteriorates due to increased area occupation
Solution Approach 1:
The conductive pattern is strategically positioned to overlap only the necessary central region of the active pattern where electrical connection is most critical, rather than covering the entire active pattern. This localized approach maintains reliable electrical connection while minimizing area occupation and improving layout efficiency.
3Reliability
If the active patterns are spaced apart to reduce current variation, then output saturation characteristic is improved, but device complexity increases due to additional spacing control
Solution Approach 1:
The optimal spacing between active patterns is predetermined and built into the device design based on preliminary analysis and simulation. This preliminary determination of spacing parameters simplifies the manufacturing process and reduces control complexity while ensuring improved output saturation characteristic and reduced current variation.
Data Source
AI summary
A display device includes: a substrate; a first conductive layer including a lower pattern disposed on the substrate; an active layer including a first active pattern disposed on the first conductive layer; and a second conductive layer including a first gate electrode disposed on the active layer, wherein the first gate electrode overlaps a first channel region included in the first active pattern, the lower pattern overlaps the first active pattern, and the first active pattern does not cross an edge of the lower pattern.