OLED Array Substrate Groove Light Shielding
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Solution Overview
Problem
Conventional OLED array substrates suffer from lateral light leakage between adjacent pixels, which affects display performance and requires additional light shielding measures that can compromise the aperture ratio.
Innovation Solution
Incorporating a groove in the peripheral portion of pixel regions with a light shielding portion, where the second electrode extends into the groove, functioning as a light shielding element, and optimizing the groove depth to minimize light leakage while maintaining a low impact on the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If additional light shielding measures are introduced to reduce lateral light leakage, then light leakage is reduced, but the aperture ratio is compromised
Solution Approach 1:
The patent combines the light shielding function with the pixel electrode structure by extending the second electrode into the groove. This integration eliminates the need for separate light shielding structures, achieving light leakage reduction without sacrificing aperture ratio since the electrode material serves dual purposes as both electrode and light shielding element.
Solution Approach 2:
The patent introduces a vertical dimension by creating grooves that extend downward from the pixel region boundary. The light shielding portion is positioned at the bottom of these grooves, utilizing the depth dimension to block lateral light leakage paths without occupying horizontal space that would reduce the aperture ratio.
2Object-affected harmful factors
If the groove depth is increased to improve light shielding, then light leakage reduction is enhanced, but the manufacturing complexity increases
Solution Approach 1:
The light emitting layer is designed to automatically fill the groove structure during the deposition process. The groove geometry itself guides the material deposition, with the light emitting layer conformally coating the groove walls and bottom, eliminating the need for additional steps to ensure proper filling or alignment.
Solution Approach 2:
The patent optimizes the groove depth parameter within a specific range (5-20 micrometers) to achieve effective light shielding while maintaining manufacturability. This parameter optimization balances the light leakage reduction benefit against the manufacturing complexity cost, identifying a sweet spot where adequate shielding is achieved without excessive depth that would complicate fabrication.
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
Effectively reduces lateral light leakage between pixels with minimal influence on the aperture ratio and simplifies the manufacturing process, improving display performance and cost-effectiveness.
Implementation Method 1
a light shielding portion located in the groove... effectively reduces lateral light leakage between pixels
Data Source
AI summary
The present disclosure relates to an array substrate, a display device, and a method for fabricating an array substrate. The array substrate includes a pixel defining layer on the dielectric layer, the pixel defining layer defining a plurality of pixel regions of the array substrate, and light emitting device on the dielectric layer and in the plurality of pixel regions. The device includes a first electrode, a light emitting layer, and a second electrode sequentially disposed from bottom to top. At least one of the plurality of pixel regions has a non-light emitting region adjacent to the pixel defining layer. The dielectric layer in the non-light emitting region has a groove. The array substrate further includes a light shielding portion located in the non-light emitting region and extending into the groove.