OLED Peripheral Dummy Pixel Reflection Layers for Etching Uniformity
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Solution Overview
Problem
Existing electro-optical devices using OLEDs face defects in insulating films between reflection layers and pixel electrodes, leading to short-circuits and non-uniform etching, which affect light path stability and image quality.
Innovation Solution
The electro-optical device incorporates first and second conductive layers in both display and peripheral regions, with overlapping structures and insulating layers, and applies a cathode or ground potential to the peripheral conductive layers to prevent defects and ensure uniform etching, while an etching stop layer maintains the integrity of the first conductive layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If reflection layers are provided for respective pixels in the display region, then light path adjustment capability is improved, but defects on insulating films between reflection layers and pixel electrodes are generated causing short-circuits
Solution Approach 1:
The device is divided into display region and peripheral region, with the peripheral region containing dummy pixels that have reflection layers and insulating films but no light-emitting functional layers. This segmentation allows the insulating films to be formed uniformly across the entire substrate including peripheral areas, providing defect coverage for the display region without requiring additional materials or processes.
Solution Approach 2:
The peripheral region with dummy pixels is prepared in advance during the same manufacturing process as the display region. The insulating films are formed over the entire substrate including the peripheral region before the display region is assembled, ensuring that potential defect locations are pre-covered with protective insulating layers.
2Ease of manufacture
If dummy pixels without anodes are arranged in the peripheral region, then manufacturing cost is reduced, but steps corresponding to film thicknesses are generated causing non-uniform etching
Solution Approach 1:
The dummy pixels in the peripheral region have the same structural layers (substrate, reflection layers, insulating films) as the display pixels, but lack only the light-emitting functional layers and anodes. This local modification maintains etching uniformity across the entire substrate while still reducing material usage and manufacturing cost compared to creating fully functional dummy pixels.
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 configuration enhances the uniformity of etching, suppresses defects, and maintains stable light emission by preventing short-circuits and ensuring consistent light path lengths, resulting in high image quality without pixel failures.
Implementation Method 1
first conductive layers in which light-reflective electrodes are arrayed
Data Source
AI summary
Reflection layers are arranged for respective pixels with predetermined intervals in a row direction (X direction) and a column direction (Y direction) in a display region, and, subsequently to the display region, are arranged in the same manner with the predetermined intervals in the row direction (X direction) and the column direction (Y direction) also in a peripheral region around the display region. First electrodes, first light path adjusting layers, and second light path adjusting layers are arranged for the respective pixels in the display region, and are arranged so as to correspond to the respective reflection layers also in the peripheral region. The respective reflection layers are partially connected to each other in the peripheral region and are electrically connected to a second electrode at a cathode potential.