OLED Shielding Member Reduces Vertical Crosstalk
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Solution Overview
Problem
High-resolution organic light emitting diode (OLED) displays face challenges in minimizing vertical crosstalk due to parasitic capacitance between the driving gate node and the data line, which affects the driving current and luminance, and is difficult to address with existing methods due to equipment and photolithography limitations in small pixel sizes.
Innovation Solution
The implementation of a shielding member connected to the second storage electrode between the driving connecting member and the data line, along with a shielding opening to reduce the height of the driving connecting member, minimizes parasitic capacitance and kickback voltage, thereby reducing vertical crosstalk and enhancing the driving gate-source voltage range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the distance between the data line and the driving gate node is increased to reduce parasitic capacitance, then vertical crosstalk is reduced, but the pixel size increases which is not feasible in high resolution displays
Solution Approach 1:
A shielding member is introduced as an intermediary element between the data line and the driving gate node. This shielding member, connected to the second storage electrode, acts as a mediator that reduces parasitic capacitance and kickback voltage without requiring increased spacing between the data line and driving gate node, thus reducing vertical crosstalk while maintaining compact pixel size
Solution Approach 2:
The solution moves from a two-dimensional planar spacing approach to a three-dimensional vertical stacking approach. By forming the shielding member and storage electrodes in different vertical layers (using shielding connection openings through insulating layers), the patent achieves electrical isolation and reduced parasitic capacitance without increasing the horizontal pixel area
2Object-affected harmful factors
If shielding members are added to reduce parasitic capacitance, then vertical crosstalk is reduced, but device complexity increases
Solution Approach 1:
The shielding member serves multiple functions simultaneously: it acts as a shield to reduce parasitic capacitance, serves as an electrode (second storage electrode) for the storage capacitor, and provides structural support. This multi-functionality reduces the need for separate dedicated shielding structures, thereby limiting the increase in device complexity
Solution Approach 2:
The patent combines the shielding function with the storage capacitor electrode structure. The second storage electrode is formed as part of the shielding member, merging two functional elements into a single integrated structure that reduces parasitic capacitance while maintaining the necessary capacitance storage function
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively reduces vertical crosstalk, allowing for more precise control of light emission and improved resolution and display quality in high-resolution OLED displays.
Implementation Method 1
due to parasitic capacitance formed between the driving gate node connected to the driving gate electrode of the driving transistor and the data line
Implementation Method 2
Electrons injected from a cathode, that is, an electrode, and holes injected from an anode, that is, another electrode, are combined with (e.g., bonded to) each other in the organic light emitting layer to form excitons. Light is emitted when the excitons discharge energy.
Data Source
AI summary
An OLED display according to an exemplary embodiment of the present disclosure includes: a substrate; a scan line on the substrate and configured to transmit a scan signal; a data line crossing the scan line and configured to transmit a data voltage; a driving voltage line crossing the scan line and configured to transmit a driving voltage, a portion of the driving voltage line being a second storage electrode; a switching transistor connected to the scan line and the data line; a driving transistor connected to the switching transistor and including a driving gate electrode; a driving connecting member connected to the driving gate electrode; a first storage electrode, the second storage electrode overlapping the first storage electrode; a shielding member connected to the second storage electrode and between the driving connecting member and the data line; and an organic light emitting diode connected to the driving transistor.