Zigzag Inspection Transistors for LCD Panel Defect Detection
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Solution Overview
Problem
In liquid crystal display panels without an RGB switching function, the width of inspection transistors is insufficient for effective pseudo dynamic lighting inspection due to the limited space between output terminals of the driver, hindering the detection of wiring breaks or short-circuits.
Innovation Solution
The display panel incorporates a zigzag pattern arrangement of inspection transistors with a polysilicon layer and a gate metal layer, where the polysilicon films form wider transistor regions and narrower wiring regions, ensuring a larger width for inspection transistors even with closely spaced driver output terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If inspection transistors are provided in a simple linear arrangement between driver output terminals, then the circuit layout is simple, but the transistor width becomes insufficient for effective inspection
Solution Approach 1:
The patent transforms the linear one-dimensional arrangement of inspection transistors into a two-dimensional zigzag pattern. This dimensional change allows transistors to be arranged diagonally across the available space between driver output terminals, effectively utilizing both horizontal and vertical dimensions to achieve sufficient transistor width (13 μm or more) while maintaining compatibility with closely spaced terminals.
Solution Approach 2:
The patent employs asymmetric routing where odd-numbered inspection transistors connect to first contacts and even-numbered transistors connect to second contacts. This asymmetric arrangement optimizes space utilization and ensures that each transistor achieves the required minimum width by distributing connections across different spatial paths rather than using uniform symmetric routing.
2Productivity
If the distance between driver output terminals is reduced to increase pixel density, then productivity increases, but the space for inspection transistors becomes insufficient
Solution Approach 1:
By arranging inspection transistors in a zigzag pattern that extends diagonally across the space between driver output terminals, the patent effectively increases the available area for transistor placement. This two-dimensional arrangement allows sufficient transistor width to be achieved even when the horizontal distance between terminals is reduced for higher pixel density.
3Manufacturing precision
If inspection transistors are arranged in a zigzag pattern, then sufficient transistor width is achieved, but the wiring complexity increases
Solution Approach 1:
The patent segments the wiring into two distinct groups: odd-numbered inspection transistors connect to first contacts, and even-numbered transistors connect to second contacts. This segmentation simplifies the overall wiring complexity by creating regular, repeating patterns rather than requiring unique routing for each transistor, making the increased complexity manageable through systematic organization.
4Device complexity
If a driver without RGB switching function is used, then device complexity is reduced, but inspection capability is compromised due to insufficient transistor width
Solution Approach 1:
The zigzag arrangement compensates for the simplified driver architecture by maximizing the use of available space in the vertical dimension. This allows inspection transistors to achieve sufficient width for reliable defect detection even when the driver lacks RGB switching functionality, maintaining inspection capability while using a simpler driver design.
Data Source
AI summary
A display panel includes a plurality of pads configured to provide a driver thereon, a plurality of first contacts respectively connected to the plurality of pads, a plurality of second contacts respectively provided so as to be opposed to the plurality of first contacts, a semiconductor layer configured to form a plurality of polysilicon films that are respectively extended to connect the plurality of first contacts and the plurality of second contacts to each other, and a gate metal layer different from the polysilicon layer. Each of a plurality of transistors is formed at a position where the gate metal layer traverses the polysilicon layer, and a plurality of transistor groups of the plurality of transistors are arranged in a zigzag pattern. Each of the plurality of transistor groups include three adjacent transistors of the plurality of transistors.