Shielding Layer for OLED Coupling Capacitance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In OLED display panels, the overlapping areas between driving transistors and light-emitting devices cause coupling capacitance, leading to non-uniform display due to varying overlapping areas and different coupling capacitances between gates and anodes of adjacent pixel units, affecting driving currents and display uniformity.
Innovation Solution
A shielding layer is introduced between the gate of the driving transistor and the first electrode of the light-emitting device, specifically a planar conductive shielding layer that covers the overlapping areas, to shield coupling capacitance and maintain consistent capacitance across all pixel units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If overlapping areas between driving transistors and light-emitting devices are increased, then device integration is improved, but coupling capacitance increases causing non-uniform display
Solution Approach 1:
A shielding layer is introduced as an intermediary component between the gate of the driving transistor and the first electrode of the light-emitting device. This shielding layer acts as a mediator to block or reduce the coupling capacitance formed by the overlapping areas, thereby preventing the harmful capacitive coupling while maintaining the beneficial overlapping area for device integration.
Solution Approach 2:
The harmful coupling capacitance effect is extracted and isolated by introducing the shielding layer. The shielding layer specifically targets and removes the unwanted capacitive coupling between the gate and the first electrode, separating the harmful electrical interaction from the structural overlapping arrangement.
2Adaptability or versatility
If varying overlapping areas are present between adjacent pixel units, then layout flexibility is improved, but coupling capacitance varies causing driving current non-uniformity
Solution Approach 1:
The shielding layer serves as a universal intermediary that standardizes the electrical interaction between the gate and first electrode across all pixel units. By placing the shielding layer in each pixel unit, the variation in coupling capacitance caused by different overlapping areas is compensated, ensuring uniform driving current characteristics.
Solution Approach 2:
The shielding layer is locally positioned in each pixel unit between the gate and the first electrode, providing localized compensation for coupling capacitance. This local quality approach ensures that each pixel unit has consistent electrical characteristics regardless of variations in overlapping area, achieving uniformity through localized intervention.
3Reliability
If shielding layer is added between gate and first electrode, then coupling capacitance is reduced improving display uniformity, but device complexity increases
Solution Approach 1:
The shielding layer is merged with the existing layer structure of the OLED display panel, integrating the shielding function into the conventional manufacturing process. By combining the shielding layer with the existing gate insulating layer and electrode structures, the solution adds minimal complexity while achieving the desired capacitance reduction.
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
The shielding layer ensures uniform display by eliminating the effect of coupling capacitance, maintaining consistent driving currents across all pixel units and achieving uniform display performance.
Implementation Method 1
a shielding layer located between a layer where a gate of the driving transistor in each pixel is located and a layer where a first electrode of the light-emitting device is located
Data Source
AI summary
The present disclosure provides an array substrate and a manufacturing method thereof, a display panel and a display device. The array substrate according to an embodiment of the present disclosure includes: a base substrate, and a plurality of pixel units located on the base substrate; each pixel unit at least includes a driving transistor and a light-emitting device; the array substrate further includes: a shielding layer located between a layer where a gate of a driving transistor in each of the pixel units is located and a layer where a first electrode of the light-emitting device is located.