OLED Pixel Isolation Structure for Uniform Anode Deposition
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Solution Overview
Problem
The manufacturing process of OLED display panels often results in uneven deposition of the anode due to the definition of vias in the planarization layer, affecting the light-emitting performance.
Innovation Solution
The display panel design includes a pixel driving layer, planarization layer, pixel defining layer, and isolation structure with linear sidewall segments and connecting holes that facilitate even anode deposition, ensuring reduced light emission brightness and improved viewing angle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vias are defined in the planarization layer during OLED manufacturing, then electrical connection is achieved, but uneven anode deposition occurs affecting light-emitting performance
Solution Approach 1:
The isolation structure serves as an intermediary element positioned between the via and the anode deposition area. It modifies the local geometry to control material deposition, ensuring uniform anode formation while preserving the electrical connection function of the via.
Solution Approach 2:
The isolation structure introduces local geometric variation (protrusion with linear sidewalls) at specific locations where anode deposition occurs. This local modification ensures uniform deposition in critical areas without affecting the overall via structure or electrical connection.
2Ease of manufacture
If conventional planarization layer structure is used, then manufacturing is simplified, but light-emitting performance is reduced due to uneven anode deposition
Solution Approach 1:
The isolation structure segments the planarization layer into distinct regions: areas with linear sidewalls for uniform anode deposition and other areas maintaining conventional structure. This segmentation allows selective optimization of deposition quality without complicating the overall manufacturing process.
3Manufacturing precision
If isolation structure with curved sidewalls is used, then structural complexity increases, but anode deposition uniformity may be compromised
Solution Approach 1:
The patent deliberately avoids curved sidewalls in the isolation structure and instead employs linear (straight) sidewalls. This geometric choice simplifies the structure while ensuring uniform anode deposition, as linear walls provide consistent spacing and geometry for deposition processes.
Data Source
AI summary
A display panel and a display device are provided. A planarization layer covers a pixel driving layer and defines connecting holes. A pixel defining layer is disposed on a side of the planarization layer away from the pixel driving layer and defines pixel openings. An isolation structure protrudes from the pixel defining layer and surrounds the pixel openings. In a surrounding direction of the isolation structure, a sidewall of the isolation structure includes at least one linear sidewall segment. An orthographic projection of the sidewall of the isolation structure projected on the planarization layer covers the connecting holes. An orthographic projection of the linear sidewall segment on the planarization layer at least partially covers the connecting holes.