OLED Display Panel Storage Capacitor Dark Stripe Prevention
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Solution Overview
Problem
Current OLED display panels suffer from the issue of dark stripes due to the reaction between plasma gases of silicon nitride and indium tin oxide or indium zinc oxide during the deposition of the buffer layer.
Innovation Solution
The OLED display panel design includes a substrate with a light-emitting functional layer, a pixel definition layer, and a drive circuit layer comprising a buffer layer, first and second electrode plates, where the first electrode plate is not deposited when forming the first buffer layer, preventing ionic gas reactions and forming a storage capacitor with transparent materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the first electrode plate is deposited during the formation of the first buffer layer, then the buffer layer can be formed to protect the substrate, but the plasma gases of silicon nitride react with indium tin oxide or indium zinc oxide to produce dark stripes
Solution Approach 1:
The first electrode plate is extracted from the deposition process during first buffer layer formation. Instead of depositing the first electrode plate at this stage, the patent forms only the first buffer layer, thereby eliminating the harmful reaction between silicon nitride plasma gases and the electrode plate material that causes dark stripes.
Solution Approach 2:
The first buffer layer is formed in advance without the first electrode plate, creating a protective barrier on the substrate before subsequent layers are deposited. This preliminary formation of the buffer layer prevents direct exposure of the substrate to harmful plasma reactions while maintaining the necessary protective function.
2Device complexity
If the first electrode plate is deposited during buffer layer formation, then the storage capacitor structure can be established, but the reaction between silicon nitride and the electrode plate material reduces manufacturing precision
Solution Approach 1:
The deposition process is segmented into distinct stages: first, the first buffer layer is formed without the electrode plate; then, the first electrode plate is deposited in a separate subsequent step. This segmentation prevents the harmful reaction during buffer layer formation while still allowing the storage capacitor structure to be established later with proper manufacturing precision.
3Illumination intensity
If transparent materials are used for electrode plates to maintain display quality, then the aperture ratio can be increased, but the reaction with silicon nitride plasma gases still produces dark stripes
Solution Approach 1:
The first buffer layer is formed preliminarily on the substrate before the transparent electrode plate materials are deposited. This preliminary buffer layer acts as a protective barrier that prevents silicon nitride plasma gases from reacting with the transparent electrode materials during subsequent processing, thereby maintaining both high aperture ratio and display quality without dark stripes.
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 reduces pixel size and increases aperture ratio by preventing the reduction reaction between silicon nitride and the first electrode plate, thereby eliminating dark stripes in OLED display panels.
Implementation Method 1
preventing ionic gas reactions and forming a storage capacitor with transparent materials
Data Source
AI summary
The present disclosure provides an OLED display panel which includes a substrate, a drive circuit layer, a light-emitting functional layer, and a pixel definition layer. The light-emitting functional layer includes a light-emitting area and a non-light-emitting area. The drive circuit layer includes a buffer layer, a first electrode plate, and a second electrode plate, and the first electrode plate and the second electrode plate form a storage capacitor. It solves the technical problem of current OLED display panels having dark stripes by not depositing the first electrode plate when silicon nitride is deposited to form a first buffer layer which prevents ionic gases produced when silicon nitride is deposited from having a reduction reaction with the first electrode plate.