AMOLED Virtual Pixel Area for Uniform Etching
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Solution Overview
Problem
AMOLED display panels face non-uniform image quality due to differences in anode sizes at the center and boundary areas, resulting from varying etching processes during manufacturing.
Innovation Solution
Incorporating a virtual pixel area with virtual electrodes outside the display area, manufactured using the same process as pixel electrodes, to ensure uniform etching and size consistency across the panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If standard etching process is used for pixel electrodes at boundary area, then manufacturing process is simple, but pixel electrode size becomes non-uniform due to lack of surrounding electrodes
Solution Approach 1:
Virtual pixel electrodes are formed in advance in the non-display area surrounding the display area. These virtual electrodes perform the preliminary action of providing etching reference structures before the actual pixel electrodes are etched, ensuring uniform etching conditions for boundary pixel electrodes without complicating the manufacturing process.
Solution Approach 2:
The virtual pixel electrodes act as intermediary structures that mediate the etching process. They serve as reference objects that enable uniform etching of boundary pixel electrodes by providing the necessary geometric context, while themselves not functioning as active display elements.
2Manufacturing precision
If virtual pixel area is added to ensure uniform etching, then pixel electrode size uniformity is improved, but device structure becomes more complex
Solution Approach 1:
The virtual pixel electrodes are extracted and placed exclusively in the non-display area, separating them from the active display region. This extraction allows the virtual electrodes to perform their etching reference function without adding visual complexity to the display area, maintaining a clean distinction between functional and non-functional regions.
Solution Approach 2:
The solution moves the virtual pixel electrodes to another spatial dimension - the non-display area surrounding the display area. This dimensional relocation allows the virtual electrodes to fulfill their etching reference purpose without occupying valuable display space, effectively adding functionality without increasing visual device complexity.
Data Source
AI summary
An AMOLED display panel comprises a display area and a non-display area. The display area has a plurality of pixel electrodes and the neighboring pixel electrodes are spaced apart from each other. The non-display area surrounds the display area and comprises a virtual pixel area and a boundary area. The virtual pixel area is close to the display area and has a plurality of virtual electrodes. At least part of the virtual electrodes are disposed close to the pixel electrodes at a boundary of the display area. The virtual electrodes and the pixel electrodes are formed by the same manufacturing process. The boundary area is close to the virtual pixel area or both the virtual pixel area and the display area. The virtual pixel area is located between the display area and the boundary area. The present invention may improve display uniformity of the AMOLED display panel.