Organic Insulating Patterns Planarize Display Non-Display Regions
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Solution Overview
Problem
Existing display devices face challenges in planarizing surface unevenness in non-display regions, which can lead to defects such as short circuits between adjacent lines, affecting the reliability and efficiency of signal transmission to pixels.
Innovation Solution
The use of insulating patterns made of organic materials, such as polyacryl-based compounds or benzocyclobutene-based compounds, is implemented between and over lines in the non-display regions to planarize surface unevenness, preventing conductive material accumulation and potential short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional planarization methods are used in non-display regions, then surface unevenness can be reduced, but short circuits between adjacent lines may occur due to conductive material accumulation
Solution Approach 1:
An organic insulating layer is introduced as an intermediary substance between adjacent conductive lines in the non-display region. This insulating layer prevents direct contact between conductive materials while filling surface unevenness, thereby eliminating the short circuit risk associated with conventional planarization methods that remove or redistribute conductive materials.
Solution Approach 2:
The patent employs a composite structure combining organic insulating materials with the existing conductive line structure. The organic insulating layer is deposited over the conductive lines, creating a composite system where the insulating material fills valleys and covers peaks of surface unevenness, providing both planarization and electrical isolation functions simultaneously.
2Reliability
If insulating patterns are added to planarize surface unevenness, then short circuit risk is reduced, but device structure becomes more complex
Solution Approach 1:
The organic insulating layer serves multiple functions simultaneously: it acts as an insulating barrier to prevent short circuits, fills surface unevenness to provide planarization, and serves as a structural foundation for subsequent processing steps. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
Solution Approach 2:
The planarization function and insulating function are merged into a single organic insulating layer structure. Rather than adding separate planarization layers and insulating layers, the patent combines these functions into one integrated component, reducing the number of discrete structural elements and simplifying the overall device architecture.
Data Source
AI summary
A display device includes a display region and a non-display region. First lines are between the substrate and the first insulating layer in the non-display region. Second lines are on a first insulating layer in the non-display region and are alternately disposed with the first lines. A second insulating layer is over the second lines and has a surface unevenness formed by the first and second lines. Third lines are over the second insulating layer and intersect the first lines and the second lines. First insulating patterns are on the second insulating layer and serve to planarize the surface unevenness. The first insulating patterns are between at least adjacent third lines in a plan view.