OLED Pixel Circuit Blocking Layer for Residual Image Reduction
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Solution Overview
Problem
High-resolution organic light emitting diode (OLED) displays face challenges in minimizing parasitic capacitance and residual images due to the kickback voltage from transistors, affecting display quality and resolution.
Innovation Solution
Incorporating a blocking layer that overlaps the driving transistor and is connected to the driving voltage line, which prevents potential changes and minimizes parasitic capacitance, thereby improving display quality and resolution by preventing residual images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a transistor is used to control the organic light emitting diode, then the display resolution and integration are improved, but parasitic capacitance and residual images increase due to kickback voltage
Solution Approach 1:
A blocking layer is introduced as an intermediary component between the transistor and the organic light emitting diode. This blocking layer acts as a mediator to prevent the kickback voltage generated by the transistor from affecting the diode, thereby reducing parasitic capacitance and residual images while maintaining the transistor's control function.
Solution Approach 2:
The structure is segmented by introducing a separate blocking layer that is electrically isolated from both the transistor and the organic light emitting diode. This segmentation allows the blocking layer to independently manage the electrical potential and prevent harmful voltage interactions without interfering with the normal operation of the transistor or diode.
2Reliability
If the blocking layer is added to reduce parasitic capacitance, then display quality is improved, but device complexity increases
Solution Approach 1:
The blocking layer is designed to perform multiple functions simultaneously: it blocks kickback voltage to reduce parasitic capacitance, maintains electrical isolation between components, and can be integrated with existing transistor and diode structures. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
Solution Approach 2:
The blocking layer is strategically positioned only where needed - between the transistor and the organic light emitting diode - to address the specific problem of kickback voltage. This localized approach ensures that the complexity increase is minimal and confined to the specific region where it is most effective, rather than requiring complex modifications throughout the entire device.
Data Source
AI summary
An organic light emitting diode display according to an exemplary embodiment includes: a substrate; a first buffer layer on the substrate; a first semiconductor layer on the first buffer layer; a first gate insulating layer on the first semiconductor layer; a first gate electrode and a blocking layer on the first gate insulating layer; a second buffer layer on the first gate electrode; a second semiconductor layer on the second buffer layer; a second gate insulating layer on the second semiconductor layer; and a second gate electrode on the second gate insulating layer.