Patterned Polarization Layer for Moisture-Resistant Rollable Displays
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Solution Overview
Problem
Existing rollable display devices face issues with warpage and cracks in the display panel due to moisture absorption by the polarization plate, which affects the device's reliability and display quality.
Innovation Solution
The implementation of a display device design that includes a polarization plate with a patterned polarization layer, where the active area has a first pattern and the non-active area has a second pattern spaced apart by protection layers, and the use of a barrier film to surround the side portions of the display panel and polarization plate to minimize moisture permeation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional polarization plate is used without patterning, then the display device has simple structure and easy manufacture, but the polarization plate absorbs moisture causing warpage and cracks in the display panel
Solution Approach 1:
The polarization layer is divided into multiple segments corresponding to different display regions (active area and non-active area). Each segment is independently patterned to control moisture absorption characteristics, preventing uniform warpage across the entire polarization plate while maintaining structural integrity of the display panel.
Solution Approach 2:
Different regions of the polarization layer are given different patterns and properties tailored to their specific functions. The active area region has one pattern configuration while the non-active area has another, allowing each region to optimally handle moisture stress locally without compromising the overall display panel structure.
2Reliability
If the polarization layer is patterned to reduce moisture absorption, then moisture permeation is minimized and warpage is suppressed, but the manufacturing process becomes more complex
Solution Approach 1:
The polarization layer patterning is segmented according to display regions, allowing standardized manufacturing processes to be applied to each segment type. This modular approach to patterning reduces overall manufacturing complexity compared to creating entirely unique patterns, while still achieving effective moisture resistance through regional optimization.
3Reliability
If the polarization layer is patterned with spaced regions, then moisture absorption is delayed and warpage is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The polarization layer is segmented into distinct regions with clear boundaries between active and non-active areas. This segmentation creates well-defined alignment references that simplify the patterning process and reduce the precision requirements compared to creating complex continuous patterns, while effectively controlling warpage through the spaced regional structure.
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 solution effectively delays moisture absorption, suppresses warpage of the display panel, and prevents cracks in the substrate, thereby enhancing the reliability and display quality of the rollable display device.
Implementation Method 1
a barrier film to surround the side portions of the display panel and polarization plate to minimize moisture permeation
Implementation Method 2
The polarization layer includes a first pattern corresponding to the active area and a second pattern spaced apart from the first pattern and corresponding to the non-active area
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
The display device includes a display panel including an active area and a non-active area; and a polarization plate on the display panel and including a polarization layer. The polarization layer includes a first pattern corresponding to the active area and a second pattern spaced apart from the first pattern and corresponding to the non-active area. Thus, it is possible to delay moisture absorption of a polarization layer.