Display Panel Peripheral Spacers for Evaporation Mask Support
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Solution Overview
Problem
Existing OLED display panels face issues with spacer placement, leading to potential deformation of evaporation masks during the organic material deposition process, which can cause color mixing and Newton rings due to insufficient support in the peripheral region.
Innovation Solution
The display panel design includes a spacer layer with repetitive units in both the display and peripheral regions, ensuring the mask is supported in the peripheral region, preventing mask deformation and reducing color mixing and Newton rings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If spacers are only provided in the display region, then the structure is simpler and manufacturing is easier, but the evaporation mask deforms due to insufficient support in the peripheral region
Solution Approach 1:
The spacer layer is divided into multiple repetitive units (first spacer repetitive units in the display region and second spacer repetitive units in the peripheral region), each serving specific local support functions. This segmentation allows targeted reinforcement where needed while maintaining overall structural simplicity.
Solution Approach 2:
The spacer layer is formed in advance during the manufacturing process, establishing the support structure before the evaporation process occurs. This preliminary action prevents mask deformation by pre-positioning spacers that will support the mask during subsequent processing.
2Reliability
If the peripheral region lacks sufficient support structures, then the device structure is simpler, but color mixing and Newton rings occur due to mask deformation
Solution Approach 1:
Different spacer repetitive units are positioned in different regions with different support requirements. The second spacer repetitive units are specifically placed in the peripheral region where additional support is needed to prevent mask deformation, while the first spacer repetitive units handle support in the display region. This local differentiation ensures display quality without unnecessary complexity throughout the entire device.
Solution Approach 2:
The spacer layer acts as an intermediary support structure between the base substrate and the evaporation mask. By introducing this intermediate element, the mask is supported and prevented from deforming, thereby eliminating color mixing and Newton rings without requiring direct modifications to the mask or substrate.
3Manufacturing precision
If the mask is unsupported in the peripheral region, then the manufacturing process is simpler, but the evaporation position deviates causing color mixing
Solution Approach 1:
The spacer repetitive units are designed to automatically provide support to the evaporation mask during the evaporation process. The spacers self-position and self-support the mask without requiring external intervention or complex control mechanisms, thereby maintaining evaporation position accuracy while keeping the manufacturing process relatively simple.
Data Source
AI summary
A display panel and a display device are provided. The display panel includes: a base substrate including a display region and a peripheral region; a pixel defining layer having a first part located in the display region and a second part located in the peripheral region, the second part and the first part being formed as an integral structure; and a spacer layer arranged on a side of the pixel defining layer away from the base substrate. The spacer layer includes a first spacer repetitive unit located in the display region and a second spacer repetitive unit located in the peripheral region. An orthographic projection of the second spacer repetitive unit on the base substrate falls within that of the second part on the base substrate and is located on a side, facing the display region, of a boundary, which is away from the display region, of the second part.