Display Pad Cover Layer for Etch-Resistant Signal Reliability
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Solution Overview
Problem
The existing display apparatuses face damage to pads during the etching process for forming black matrices and color filters, which compromises the reliability of signal transmission.
Innovation Solution
The display apparatus incorporates a pad cover layer made of titanium, which extends over the pad electrode layer and has etch selectivity with the black matrix and color filters, preventing damage during these processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pad is disposed outside the encapsulating element to receive signals from outside, then the signal transmission function is improved, but the pad is damaged by the etching process for forming black matrix and color filters
Solution Approach 1:
The pad cover layer is formed over the pad electrode layer before the etching process for black matrix and color filters. This preliminary protective action prevents the pad from being damaged during subsequent etching operations, allowing the pad to maintain its signal transmission function without harm.
Solution Approach 2:
The pad cover layer acts as an intermediary protective element between the pad electrode layer and the etching process. It shields the pad from direct exposure to harmful etchants while allowing the etching process to proceed for forming black matrix and color filters on the encapsulating element.
2Reliability
If the pad cover layer is formed to protect the pad during etching, then the pad damage is prevented, but the device structure becomes more complex
Solution Approach 1:
The pad cover layer serves multiple functions: it protects the pad during etching processes, provides a planar surface for subsequent black matrix and color filter formation, and can be integrated with other protective layers in the device structure. This multi-functionality justifies the additional structural element.
Solution Approach 2:
The pad cover layer is designed with specific material properties (etch selectivity) that allow it to be differentiated from other layers during processing. By controlling the material composition and etch resistance parameters, the protective function is achieved without requiring overly complex structural designs.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively prevents pad damage during the etching process, enhancing the reliability of signal transmission and maintaining the integrity of the display apparatus.
Implementation Method 1
The pad cover layer can have an etch selectivity with the black matrix. The pad cover layer can have an etch selectivity with the color filters.
Data Source
AI summary
A display apparatus is provided. The display apparatus includes a pad spaced away from an encapsulating element. The pad can have a stacked structure of a pad electrode layer and a pad cover layer. A side surface of the pad electrode layer can be covered by the pad cover layer. Thus, in the display apparatus, damage of the pad electrode layer due to a subsequent process can be prevented and as such, the reliability of an external signal transmitted through the pad can be improved.