OLED Contact Hole Layout to Prevent Light-Shielding Layer Shorts
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Solution Overview
Problem
There is a risk of a short circuit occurring between the light-shielding layer and the connection electrode in OLED displays, which can lead to performance issues and potential damage.
Innovation Solution
The design includes a light-shielding layer with a hole that overlaps the contact hole, allowing the connection electrode to penetrate the active layer without overlapping the contact hole, thereby preventing direct contact and short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the light-shielding layer is disposed to overlap the contact hole to simplify the structure, then the manufacturing process is easier, but a short circuit occurs between the light-shielding layer and the connection electrode
Solution Approach 1:
The light-shielding layer is segmented into multiple portions: a first light-shielding layer portion that does not overlap the contact hole (preventing short circuit), and a second light-shielding layer portion that overlaps the contact hole (maintaining shielding function). This segmentation allows the structure to simultaneously achieve both reliability and ease of manufacture.
Solution Approach 2:
Different regions of the light-shielding layer are assigned different functions: the first portion is designed for electrical isolation (not overlapping the contact hole), while the second portion is designed for light shielding (overlapping the contact hole). This local differentiation resolves the contradiction by allowing each region to optimize for its specific purpose.
2Reliability
If the connection electrode penetrates the active layer to improve electrical connection, then the electrical conductivity is improved, but the risk of short circuit with the light-shielding layer increases
Solution Approach 1:
The first portion of the light-shielding layer acts as an intermediary barrier between the connection electrode and the substrate, preventing direct contact and short circuit while allowing the connection electrode to maintain its penetrating path for electrical connection.
Solution Approach 2:
The light-shielding layer is configured in advance to counteract the potential harmful effect of the connection electrode penetrating the active layer. By positioning the first light-shielding layer portion to not overlap the contact hole, the design preemptively prevents short circuit before it can occur.
Data Source
AI summary
The disclosure relates to a display device and an electronic device that can prevent a short circuit between a light-shielding layer and a connection electrode. According to an aspect of the disclosure, a display device includes: a substrate; a light-shielding layer disposed on the substrate; an active layer disposed on the light-shielding layer; a first transistor including a gate electrode disposed adjacent to the active layer; a light-emitting element electrically connected to the first transistor; and a connection electrode disposed on the active layer and the gate electrode, wherein: the connection electrode is connected to the active layer through a first contact hole in an interlayer insulating film and to the gate electrode through a second contact hole in the interlayer insulating film; and the light-shielding layer does not overlap the first contact hole.