Display Insulating Layer Openings to Suppress Impact Transmission
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Solution Overview
Problem
Display devices, particularly organic light emitting display devices, face challenges in reliability due to the transmission of external impacts, which can lead to defects such as dark or bright spots, and existing manufacturing methods do not adequately address this issue.
Innovation Solution
The proposed solution involves a display device structure with a specific layer configuration that includes a substrate, semiconductor layers, insulating layers, and conductive layers, where the insulating layers are patterned to minimize exposure and thereby suppress external impact transmission, improving the device's reliability by reducing the area of inorganic insulating layers that could transmit such impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insulating layers are made continuous and complete to ensure electrical insulation, then electrical reliability is improved, but external impact transmission is increased
Solution Approach 1:
The continuous insulating layer is divided into multiple segments: a first insulating layer covering the semiconductor layer, a second insulating layer covering the first conductive layer, and openings formed in these layers. This segmentation allows the insulating structure to maintain electrical insulation while creating discontinuities that interrupt impact transmission paths to the semiconductor layer.
Solution Approach 2:
The insulating layers are configured with different properties in different regions: they are present in areas where electrical insulation is needed (overlapping regions of conductive layers) and absent or reduced in areas where impact protection is prioritized (non-overlapping regions). This local differentiation resolves the contradiction by providing electrical insulation only where necessary while reducing impact transmission in other areas.
2Reliability
If insulating layers are removed in non-overlapping areas to reduce impact transmission, then reliability against external impact is improved, but manufacturing complexity increases
Solution Approach 1:
The insulating layers are selectively formed and removed in advance during the manufacturing process, before final device assembly. The first and second insulating layers are deposited, patterned with openings, and selectively removed in non-overlapping areas during the fabrication sequence, simplifying the overall manufacturing by preparing the impact-resistant structure beforehand rather than requiring post-assembly modifications.
3Reliability
If openings are formed in insulating layers to reduce impact transmission, then device reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The first and second conductive layers serve multiple functions: they provide electrical connectivity for device operation and simultaneously act as etch masks during the opening formation process. This multi-functionality simplifies manufacturing by using existing structural elements for dual purposes, reducing the need for separate precision masking steps and lowering overall manufacturing precision requirements.
Data Source
AI summary
A display device includes a plurality of first pixels, a substrate, a first semiconductor layer which is disposed on the substrate and includes an active layer of a first transistor, a first insulating layer which is disposed on the first semiconductor layer, a first conductive layer which is disposed on the first insulating layer and includes a gate electrode of the first transistor, a second insulating layer which is disposed on the first conductive layer, and a second conductive layer which is disposed on the second insulating layer and includes a first electrode and a second electrode of the first transistor, where a first opening exposing the first conductive layer in an area in which the first conductive layer and the second conductive layer of each of the plurality of first pixels do not overlap is defined in the second insulating layer.