Deposition Mask Structure for Mixed-Resolution Display Electrodes
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Solution Overview
Problem
Existing display devices face challenges in efficiently manufacturing display areas with varying resolutions and incorporating input/output components without compromising the display quality or resolution.
Innovation Solution
A deposition mask with a unique design featuring ribs and bridges is used to form a common electrode with extension portions, allowing for one-time deposition across different display areas with varying resolutions, while ensuring the input/output components are not obstructed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a common electrode is formed over the entire substrate including high pixel density areas, then electrode integrity is maintained, but transmittance in transmission areas deteriorates
Solution Approach 1:
The common electrode is segmented into different regions: a main common electrode region for high pixel density areas and extension portions for lower pixel density areas. This segmentation allows the electrode structure to be optimized for different functional requirements - integrity in display areas and transmittance in transmission areas.
Solution Approach 2:
Different regions of the common electrode are designed with different properties. The main common electrode region maintains full coverage for electrode integrity, while extension portions are strategically placed only in transmission areas where high transmittance is required, creating local quality variations to satisfy different functional needs.
2Illumination intensity
If the common electrode is removed in transmission areas, then transmittance is improved, but electrode integrity deteriorates
Solution Approach 1:
The common electrode structure is divided into a main region that provides continuous coverage for integrity and extension portions that are selectively removed or thinned in transmission areas. This segmentation enables simultaneous achievement of both integrity and transmittance requirements.
Solution Approach 2:
Extension portions act as intermediaries that connect the main common electrode to the transmission areas. These extension portions are designed with reduced thickness or selective removal to facilitate light transmission while maintaining electrical connectivity and structural integrity.
3Manufacturing precision
If a deposition mask with ribs and bridges is used, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The deposition mask is segmented into a main frame, ribs extending from the frame, and bridges connecting the ribs. This segmentation creates a structured pattern that defines different deposition regions (main common electrode area and extension portions), enabling precise control over electrode formation while managing structural complexity through systematic division.
Solution Approach 2:
Different parts of the deposition mask are designed with different structural characteristics. The main frame provides overall support, ribs define the extension portion regions, and bridges connect the ribs while allowing deposition material to pass through. This local quality variation in the mask structure enables precise control of deposition patterns.
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
Enables the production of display devices with distinct display areas of different resolutions and integrated input/output components, maintaining high transmittance and preventing alignment defects during manufacturing.
Implementation Method 1
forming a common electrode over the substrate through the deposition mask
Data Source
AI summary
Provided are a deposition mask, a method of manufacturing a display device using the deposition mask, and a display device. The deposition mask includes a main frame defining a first opening; ribs extending away from a side of the main frame, the ribs being apart from each other and defining second openings; and bridges connecting the ribs to one another across the second openings, wherein the bridges and the ribs form the same top surface, and a thickness of each of the bridges is less than a thickness of each of the ribs.