Display Color Filter Dam Segmentation for Volume Consistency
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Solution Overview
Problem
In display apparatuses, color filters on pixel areas often exhibit volume differences due to varying amounts of material injected, leading to color deviations, as the number and arrangement of nozzles in the ink-jet process can differ, causing inconsistencies in filter formation.
Innovation Solution
The display apparatus incorporates a specific arrangement of separation dams, including first and second dam patterns with varying lengths and thicknesses, to ensure consistent material distribution and reduce volume differences between color filters, with second dam patterns having shorter lengths and thinner thicknesses to facilitate even inkjet formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If color filters are formed by ink-jet process with multiple nozzles, then productivity is improved, but manufacturing precision deteriorates due to volume differences
Solution Approach 1:
The separating dams are divided into first separating dams extending in the first direction and second separating dams extending in the second direction, creating a grid-like structure that segments the formation regions. This segmentation allows for better control of material distribution and reduces volume differences between adjacent color filters formed by multiple nozzles.
Solution Approach 2:
The second separating dams are positioned specifically between pixel areas that display the same color, creating localized control regions. This local quality approach ensures that color filters displaying the same color have consistent volumes, while allowing different colors to have their own optimized formation regions.
2Productivity
If the number of nozzles is increased to cover larger regions, then productivity is improved, but manufacturing precision deteriorates due to varying material amounts
Solution Approach 1:
By dividing the separating dams into two directions with different orientations, the system creates multiple smaller formation regions that can be independently controlled by different nozzles. This allows larger regions to be covered efficiently while maintaining precise material distribution control in each segment.
Solution Approach 2:
The separating dams extend in two different directions (first direction and second direction), adding a dimensional aspect to the region division. This two-dimensional segmentation approach allows for more effective control of material distribution across larger areas compared to single-direction separation.
3Manufacturing precision
If separating dams are used to define formation regions, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The separating dam structure is segmented into two functional types (first and second separating dams) with different orientations. This segmentation provides precise formation control while maintaining a relatively simple overall structure that can be manufactured using standard processes.
Solution Approach 2:
The separating dams serve multiple functions: they define formation regions, control material distribution, prevent mixing of adjacent color filters, and provide structural support. This multi-functionality reduces the need for additional components, thereby limiting the increase in device complexity.
Data Source
AI summary
A display apparatus including color filters is disclosed. The display apparatus may comprise a device substrate including pixel areas. A light-emitting device may be disposed on each pixel area. An encapsulating layer covering the light-emitting devices may be disposed on the device substrate. The color filters may be disposed on the encapsulating layer. For example, separating dams defining openings overlapping with the light-emitting devices may be disposed on the encapsulating layer. The pixel areas disposed in a first direction may display the same color. Some of the separating dams extending in a second direction that is different from the first direction between the pixel areas may have a relatively short length. Thus, in the display apparatus, the volume difference between the color filters may be reduced.