OLED Blocking Layer Extending from Drain Electrode
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Solution Overview
Problem
Existing OLED displays experience vertical crosstalk due to parasitic capacitance formed between the driving gate node and the data line, affecting luminance consistency across pixels.
Innovation Solution
The OLED display incorporates a blocking member extending from the driving drain electrode to overlap a portion of the adjacent data line, effectively blocking parasitic capacitance and minimizing vertical crosstalk by overlapping the blocking member with the adjacent data line, which is shifted to prevent electrical interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the data line is positioned close to the driving gate node for compact layout, then the device area is reduced, but parasitic capacitance increases causing vertical crosstalk
Solution Approach 1:
A blocking member is introduced as an intermediary element between the data line and the driving gate node. This blocking member extends from the driving drain electrode to overlap with the data line, serving as a mediator that blocks the electric field coupling and reduces parasitic capacitance while allowing the data line to maintain its compact position
Solution Approach 2:
The blocking member utilizes the vertical dimension (depth direction) to resolve the horizontal proximity issue. By extending the blocking member vertically from the driving drain electrode to overlap the data line in the depth direction, the solution addresses the parasitic capacitance problem without requiring horizontal separation of the data line and driving gate node
2Object-affected harmful factors
If the blocking member is extended to overlap the data line, then parasitic capacitance is reduced, but the device complexity increases
Solution Approach 1:
The blocking member is merged with the driving drain electrode structure, extending from it to overlap the data line. This integration allows the blocking function to be achieved without adding a completely separate component, thereby reducing the increase in device complexity while still effectively reducing parasitic capacitance
Data Source
AI summary
An organic light-emitting diode (OLED) display is disclosed. In one aspect, the OLED display includes a scan line configured to transmit a scan signal and a data line crossing the scan line and configured to transmit a data voltage. The OLED display also includes a driving voltage line crossing a scan line and configured to transmit a driving voltage, a switching transistor connected to the scan and data lines, and a driving transistor connected to the switching transistor and including a driving gate electrode configured to function as a first storage electrode. The OLED display further includes a second storage electrode overlapping the first storage electrode and an expansion portion of the driving voltage line, an OLED electrically connected to the driving transistor and a blocking layer extending from the driving drain electrode and overlapping a portion of the data.