Display Electrode Structure With Moisture-Blocking Groove Layout
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Solution Overview
Problem
There is a challenge in reducing the width of the non-display area in liquid crystal display devices while maintaining the reliability of the display, as narrowing the frame and increasing wiring density makes it difficult to form groove portions that prevent moisture permeation, which can lead to detachment of layers and affect the display's reliability.
Innovation Solution
The display device incorporates a groove portion in the organic insulating layer between the wiring group and the opening portion, covered by an inorganic insulating layer that inhibits moisture spread, enhancing the reliability by using a configuration where the first substrate has a groove portion exposing the inorganic insulating layer between the opening and the wiring group, and the transparent conductive layer is in contact with the inorganic insulating layer in the groove portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the non-display area width is reduced to narrow the frame, then the display area increases, but moisture permeation prevention becomes difficult and layer detachment risk increases
Solution Approach 1:
The patent divides the insulating layer into multiple functional segments: a groove portion that physically blocks moisture pathways, an opening portion that maintains electrical connectivity, and a covered region where the inorganic insulating layer prevents moisture permeation. This segmentation allows the structure to simultaneously achieve moisture prevention and electrical functionality in the narrowed non-display area.
Solution Approach 2:
The patent applies different structural qualities to different regions: the groove portion has exposed inorganic insulating layer for moisture blocking, while the opening portion has transparent conductive layers for electrical connection. This local differentiation allows each region to perform its specific function optimally within the constrained non-display area.
2Area of stationary object
If wiring density is increased to reduce non-display area, then the display area increases, but moisture spread prevention becomes more difficult
Solution Approach 1:
The inorganic insulating layer acts as an intermediary barrier between the groove portion and the opening portion. It prevents moisture from spreading laterally through the insulating layer while still allowing the transparent conductive layers to establish electrical connections through the opening portion, thus blocking moisture pathways without compromising electrical functionality.
Solution Approach 2:
The patent addresses moisture prevention by transitioning from a two-dimensional planar insulating layer to a three-dimensional structure with vertical grooves and layered inorganic insulation. This dimensional change creates physical barriers that block moisture spread pathways while maintaining the necessary electrical connectivity in the high-density wiring region.
Data Source
AI summary
According to one embodiment, a display device includes, a first inorganic insulating layer, a first metal layer, a wiring group, a first organic insulating layer formed above the first inorganic insulating layer, the first metal layer and the wiring group, a second inorganic insulating layer formed above the first organic insulating layer and includes an opening portion overlapping the first metal layer, and a first transparent conductive layer formed above the second inorganic insulating layer, overlapping the opening portion and electrically connected to the first metal layer. The first organic insulating layer includes a groove portion which exposes the first inorganic insulating layer between the opening portion and the wiring group.