Transparent Display Power-Line Layout for Early Defect Repair
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Solution Overview
Problem
The yield of transparent display devices is reduced due to defects in the driving transistor, which are difficult to repair after the anode electrode is formed, leading to increased tact time and reduced repair yield.
Innovation Solution
A transparent display device design that includes a substrate with a display area and a non-display area, featuring multiple metal lines and connection electrodes on different layers to reduce resistance and allow for stable voltage supply to subpixels, enabling defect testing and repair before the anode electrode is deposited.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the anode electrode is formed before testing the driving transistor, then the display device structure is complete, but repair yield is reduced and tact time is increased
Solution Approach 1:
The patent applies preliminary action by testing the driving transistor before forming the anode electrode and organic films. This allows defects to be detected and repaired early in the manufacturing process, before subsequent layers are deposited that would complicate or prevent repair operations. The test is performed on the semiconductor layer while the substrate is still in the fabrication process, enabling early defect detection and resolution.
2Reliability
If the anode electrode and organic film are deposited, then the display device structure is complete, but defect repair becomes difficult and yield decreases
Solution Approach 1:
The patent performs the driving transistor test before depositing the anode electrode and organic film layers. This preliminary testing approach allows defects to be identified and repaired when the semiconductor layer is still accessible, before subsequent layers are formed that would make repair operations difficult or impossible.
3Reliability
If multiple connection electrodes on different layers are used, then resistance is reduced and voltage supply is stabilized, but device complexity increases
Solution Approach 1:
The patent utilizes multiple layers (vertical dimension) to provide multiple connection electrodes between the pad and the common power line. By distributing connections across different layers, the total connection area is increased, which reduces resistance and stabilizes voltage supply. This multi-layer approach transforms a two-dimensional connection problem into a three-dimensional solution.
Solution Approach 2:
The patent combines multiple connection electrodes from different layers to work together as a unified connection system. The first connection electrode in the first layer and the second connection electrode in the second layer are both connected to the same pad and common power line, merging their conductive paths to reduce overall resistance and improve voltage supply stability.
4Reliability
If the total area of power lines is increased, then resistance is reduced, but non-display area increases and transmittance decreases
Solution Approach 1:
The patent increases the total area of the common power line by extending it into the non-display area, utilizing the vertical dimension through multiple layers. This allows the power line to have greater cross-sectional area and lower resistance without significantly increasing the horizontal footprint that would block light transmission in the display area.
Data Source
AI summary
A transparent display device is disclosed, which may improve yield and reduce a tact time, and may reduce resistance of a power line. The transparent display device includes a substrate provided with a display area, in which a plurality of subpixels are disposed, and a non-display area adjacent to the display area. The device further includes first and second pads provided over the substrate, a first pixel power line extended between a pad area in which the first pad and the second pad are disposed and the display area in a first direction, a first common power line extended between the first pixel power line and the display area in the first direction, a first common power connection electrode electrically connecting the second pad with the first common power line, and a second common power connection electrode disposed in a layer different from the first common power connection electrode, electrically connecting the second pad with the first common power line.