OLED Shielding Layer for Pixel Coupling Interference
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Solution Overview
Problem
In OLED displays, the close proximity of adjacent pixels leads to coupling effects where the anode of one pixel interferes with the light emission of adjacent pixels, degrading display quality, especially in small-sized or high-resolution displays.
Innovation Solution
An array substrate with a shielding layer insulated from each anode is introduced, positioned to overlap the gap between adjacent pixels, which shields the electric field and prevents coupling voltage interference by being grounded and having a larger capacitance value than the coupling capacitor between adjacent anodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the distance between adjacent pixels is reduced to increase resolution, then the display resolution is improved, but the coupling effect between adjacent pixels increases causing display quality degradation
Solution Approach 1:
A shielding layer is introduced as an intermediary component between adjacent pixels. This shielding layer, positioned between the anodes of adjacent pixels, acts as a mediator that blocks the harmful electric field coupling while allowing the display to maintain high resolution with reduced pixel pitch.
Solution Approach 2:
The shielding layer is segmented to correspond with the pixel structure, with each shielding layer positioned to shield a specific pixel's anode from adjacent pixels. This segmentation allows the shielding function to be integrated into the pixel array without significantly increasing overall device complexity.
2Object-affected harmful factors
If a shielding layer is added to reduce coupling effects, then the display quality is improved, but the device structure becomes more complex
Solution Approach 1:
The shielding layer is merged with the existing pixel structure and fabrication process. The shielding layer is formed using the same thin-film deposition techniques as other pixel components, and its pattern is integrated into the standard pixel layout, reducing the need for separate complex shielding structures.
Solution Approach 2:
The shielding layer serves multiple functions: it shields adjacent pixels from coupling effects, maintains the electric field for proper pixel operation, and can be formed using standard fabrication processes. This multi-functionality reduces the need for additional dedicated shielding components.
3Object-affected harmful factors
If the shielding layer is positioned closer to the anode to improve shielding effect, then the coupling voltage is reduced, but the capacitance between shielding layer and anode increases affecting pixel performance
Solution Approach 1:
The design optimizes the shielding layer's position, thickness, and material properties to achieve the right balance. By adjusting these parameters, the shielding effect is maximized while the parasitic capacitance between the shielding layer and anode is kept at acceptable levels, maintaining proper pixel energy consumption and performance.
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 solution effectively reduces interference between adjacent pixels, improving display quality by eliminating coupling voltage effects and enhancing the light emission of individual pixels.
Implementation Method 1
a shielding layer disposed to be insulated from each of the anodes, the shielding layer is used to shield an electric field between two adjacent pixels
Implementation Method 2
a capacitance value of the first coupling capacitor corresponding to each of the anodes is not less than a capacitance value of corresponding second coupling capacitor
Data Source
AI summary
The present disclosure provides an array substrate, a method for fabricating the array substrate, a display panel, and a display device, wherein there is disposed a shielding layer insulated from each of anodes and capable of shielding an electric field between two adjacent pixels, so that when a pixel emits light, an electric field between an anode in the pixel emitting light and an anode in an adjacent pixel can be shielded. Thus, it is possible to avoid a coupling voltage at the anode in the adjacent pixel caused by the anode in the pixel emitting light under the coupling effect, thereby eliminating the interference with the pixel light emission from the coupling effect between the anodes in the two adjacent pixels, and improving the display effect.