Subpixel Voltage Line Layout for Low-Damage Laser Repair
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Solution Overview
Problem
During the repair process of display devices, there is a risk of damaging adjacent lines or elements when repairing defects in subpixels, leading to performance drops or increased signal line resistance.
Innovation Solution
The implementation of a display device with a subpixel structure that includes reference voltage line connection patterns, where a first pattern is connected to a thin film transistor and a second pattern on a different layer, electrically connected through a contact-hole, allowing for low-power cutting and reducing peripheral damage during repairs by using an active layer for signal lines and a metal layer for other portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of repair
If a laser cutting method is used to repair defects in subpixels, then the repair process can be performed, but damage to adjacent lines or elements can occur
Solution Approach 1:
The voltage line connection pattern is divided into multiple segments across different layers (first layer, second layer, third layer). This segmentation allows the laser to cut only the active layer portion while leaving other layers intact, preventing damage to adjacent elements while still enabling effective repair of the subpixel defect.
Solution Approach 2:
The connection pattern extends into the vertical dimension by using multiple layers stacked above each other. The active layer is positioned between insulating layers, creating a three-dimensional structure where the cutting path can be precisely controlled to affect only the active layer while preserving surrounding structures on other layers.
2Device complexity
If a traditional single-layer connection pattern is used, then the structure is simple, but cutting may damage surrounding elements due to higher power requirements
Solution Approach 1:
The connection pattern is segmented across multiple layers with insulating layers between them. This segmentation reduces the power required for cutting since only the active layer needs to be cut, thereby reducing damage to surrounding elements while maintaining structural integrity.
Solution Approach 2:
Insulating layers are introduced as intermediary elements between the active layer and other conductive layers. These insulating layers act as protective barriers that prevent the laser cutting process from affecting adjacent conductive elements, allowing for safer repair operations.
3Reliability
If the connection pattern is continuous, then electrical connection is ensured, but repair cutting may increase signal line resistance
Solution Approach 1:
The continuous connection is segmented into multiple discrete connection points across different layers. Each segment maintains electrical connection through vertical stacking, and the segmentation allows precise cutting of only the active layer portion without affecting the overall continuity of the electrical path through other layers.
Solution Approach 2:
The connection pattern uses a composite multi-layer structure combining active layer, insulating layers, and other conductive layers. This composite structure ensures that cutting one layer does not compromise the overall electrical connection, as other layers provide redundant conduction paths that maintain low resistance.
Data Source
AI summary
Embodiments of the present disclosure are related to a display device, as a voltage line connection pattern electrically connecting a voltage line and a circuit element in a subpixel includes a first voltage line connection pattern, for example, disposed using an active layer and a second voltage line connection pattern, for example, disposed using a metal layer and not disposed in a part area on the first voltage line connection pattern, a damage of an electrode located at a periphery can be prevented or at least reduced when cutting by a laser for a repair. Furthermore, as the voltage line connection pattern which is easily cut and has a low resistance is disposed, a structure can be provided that is capable of responding to various types of repairs such as a disconnection defect of other signal lines.