Display Pad Electrode Layout for Thin Insulating Layer Reliability
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Solution Overview
Problem
Conventional display apparatuses face challenges in protecting the insulating layer on which pixel electrodes are arranged, leading to potential damage and affecting the reliability and performance of the display.
Innovation Solution
A display apparatus with a specific layered structure including a substrate, thin-film transistor, conductive layer, and multiple insulating layers with strategically designed openings to expose the pad electrode, ensuring protection and proper electrical connections while preventing external damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the insulating layer is made thinner to reduce device thickness, then the overall device thickness is reduced, but the insulating layer becomes more susceptible to damage
Solution Approach 1:
The insulating layer is divided into multiple segments (first insulating layer, second insulating layer, third insulating layer) with different thicknesses and functions. The first insulating layer provides electrical insulation, the second provides mechanical protection, and the third provides additional insulation and support, collectively protecting the pixel electrodes while maintaining overall device thinness.
Solution Approach 2:
Different regions of the insulating structure have different thicknesses and properties. The insulating layer has greater thickness at edges and corners where mechanical stress is highest, while being thinner in central regions where electrical insulation requirements are lower, optimizing both protection and device thickness.
2Reliability
If the insulating layer is made thicker to protect pixel electrodes, then the insulating layer becomes more durable, but the device thickness increases
Solution Approach 1:
The protective insulating function is segmented across multiple layers rather than using a single thick layer. This distributes the total thickness across functionally distinct layers, providing comprehensive protection while maintaining overall device thinness through optimized layer arrangement.
Solution Approach 2:
The insulating structure transitions from a two-dimensional planar layer to a three-dimensional multi-layer architecture with vertical stacking. This adds the vertical dimension to the design, allowing enhanced protection through layered construction without proportionally increasing the horizontal footprint.
3Reliability
If openings are made larger to expose pad electrodes for connection, then electrical connectivity is improved, but the insulating layer becomes more vulnerable to damage
Solution Approach 1:
The opening structure is segmented into multiple stepped levels rather than a single large opening. The first opening exposes the pad electrode for connection, while the second and third openings provide protective ledges at different heights, creating a stepped architecture that maintains electrical connectivity while reducing direct exposure to harmful factors.
Solution Approach 2:
The stepped opening structure provides beforehand cushioning by creating protective ledges and recesses around the pad electrode. These structural features act as buffers that absorb mechanical stress and prevent direct damage to the insulating layer and electrode, while still allowing necessary electrical connections.
4Reliability
If multiple insulating layers are added to protect pixel electrodes, then the insulating layer becomes more robust, but the manufacturing process becomes more complex
Solution Approach 1:
The manufacturing process is segmented into distinct stages corresponding to each insulating layer formation. Each layer is deposited, patterned, and etched as a separate module, allowing standardized processes to be repeated and optimized independently, which manages complexity through modular construction.
Solution Approach 2:
Each subsequent insulating layer is formed with preliminary patterning that anticipates future opening requirements. The layers are prepared in advance with pre-defined regions that will later become openings, reducing the need for complex post-processing and simplifying the overall manufacturing sequence.
Data Source
AI summary
A display apparatus includes a substrate including a display area and a peripheral area adjacent to the display area, a thin-film transistor located in the display area of the substrate and including a semiconductor layer and a gate electrode overlapping a channel region of the semiconductor layer, a conductive layer disposed between the substrate and the semiconductor layer and including a first electrode located in the display area of the substrate and a pad electrode located in the peripheral area of the substrate, and a first insulating layer disposed between the conductive layer and the semiconductor layer and having a first opening that exposes at least a portion of an upper surface of the pad electrode.