OLED Display Spacer Configuration for Impact Resistance
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Solution Overview
Problem
Existing OLED displays face challenges in tolerating external impacts without significant deterioration in display quality, particularly due to the vulnerability of spacers under external forces which can lead to luminance reduction and blurry images.
Innovation Solution
The use of spacers with different heights and cross-sectional areas, where a main spacer with a larger height and smaller cross-section is positioned adjacent to blue pixels to absorb external impacts, while a sub spacer with a smaller height and larger cross-section is placed between red and green pixels to prevent substrate collapse, thereby maintaining display luminance and clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If spacers with uniform height and cross-section are used, then the structure is simple and easy to manufacture, but the display quality deteriorates under external impacts due to spacer vulnerability
Solution Approach 1:
The spacer structure is divided into two distinct types: main spacers with larger height and smaller cross-sectional area, and sub spacers with smaller height and larger cross-sectional area. This segmentation allows each spacer type to perform its specific function - main spacers absorb impact forces while sub spacers prevent substrate collapse - thereby improving display reliability under external impact without requiring complete redesign of the entire spacer system.
Solution Approach 2:
Different regions of the display are assigned different spacer configurations based on local requirements. Main spacers are positioned at locations requiring impact absorption, while sub spacers are placed where substrate support is critical. This local differentiation optimizes the overall system performance by matching spacer characteristics to specific functional needs rather than using a uniform design throughout.
2Reliability
If main spacers with larger height are used to absorb impacts, then impact tolerance improves, but the cross-sectional area must be reduced which may weaken structural support
Solution Approach 1:
The spacer system is segmented into main spacers optimized for impact absorption (larger height, smaller cross-section) and sub spacers optimized for structural support (smaller height, larger cross-section). This division allows the main spacers to excel at impact tolerance without compromising overall structural integrity, as the sub spacers compensate for the reduced cross-sectional area of the main spacers.
Solution Approach 2:
The sub spacers act as intermediary elements that provide additional structural support to compensate for the reduced cross-sectional area of the main spacers. By introducing these intermediate support structures, the system achieves both impact absorption capability and sufficient structural strength without requiring the main spacers to have large cross-sectional areas.
3Strength
If sub spacers with larger cross-sectional area are used to prevent substrate collapse, then substrate support improves, but the height is reduced which may limit impact absorption
Solution Approach 1:
The spacer functionality is segmented between two types: sub spacers with larger cross-sectional area dedicated to substrate support and prevention of collapse, and main spacers with larger height dedicated to impact absorption. This segmentation allows each component to be optimized for its primary function without compromising the other, as the two spacer types work complementarily rather than competing for the same structural role.
Solution Approach 2:
The dual-spacer system creates a multi-functional structure where the combination of main spacers and sub spacers provides both impact absorption and substrate support capabilities. While individual spacer types are specialized, the overall system achieves universality by integrating multiple functions through the coordinated action of different spacer types, allowing the display to handle both impact forces and substrate stability requirements.
Data Source
AI summary
An organic light emitting diode display includes a red pixel including a red organic emission layer, a blue pixel including a blue organic emission layer, a green pixel including a green organic emission layer, a main spacer adjacent to the blue pixel, and a sub spacer shorter than the main spacer.