Color Filter First Structures Prevent Ink Rebound
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Solution Overview
Problem
The existing methods for manufacturing color filters using ink-jet printing techniques often result in micro-spots on the surface of the banks due to ink rebound and scattering, which adversely affect the display panel's characteristics.
Innovation Solution
The implementation of a color filter design featuring first structures with an ink-philic surface and a width narrower than the pixel units, and a height lower than the banks, along with an ink-repellent top surface on the banks, to minimize micro-spots by using etchable and insulating materials, and arranging these structures at specific distances to prevent ink rebound.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If ink-jet printing technique is used to form coloring layers, then manufacturing simplicity and ink consumption are improved, but micro-spots are generated on bank surfaces due to ink rebound and scattering
Solution Approach 1:
The patent applies preliminary action by forming the first structure (pillar or wall) on the pixel unit surface before the ink-jet printing process. This pre-formed structure serves as an ink collection well that prevents ink rebound and scattering during the printing process, thereby eliminating micro-spots on bank surfaces while maintaining the simplicity of ink-jet manufacturing
Solution Approach 2:
The first structure acts as an intermediary element between the ink-jet printing system and the pixel unit. It mediates the ink flow by providing a controlled collection area that prevents direct ink rebound onto the bank, thus solving the micro-spot problem while preserving the ease of ink-jet manufacturing
2Productivity
If ink droplets are jetted to pixel units, then coloring layer formation is achieved, but ink rebound and scattering occur causing micro-spots on banks
Solution Approach 1:
The first structure is formed in advance on the pixel unit surface to create an ink collection well before the ink-jet printing process. This preliminary structure prevents ink rebound and scattering during the coloring layer formation, thereby maintaining productivity while eliminating harmful ink rebound effects
Solution Approach 2:
The patent converts the potentially harmful ink rebound and scattering into a beneficial effect by designing the first structure to intentionally collect and contain the ink. The structure transforms the rebounding ink into a controlled collection well that prevents micro-spot formation, thereby converting a harmful phenomenon into a useful ink containment mechanism
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 approach reduces the defect rate and minimizes micro-spots, enhancing the quality of the color filter by ensuring proper ink distribution and preventing ink rebound during the printing process.
Implementation Method 1
a plurality of first structures formed on the pixel unit, having a width narrower than a width of the pixel unit, and a height lower than a height of the bank
Implementation Method 2
a surface of the plurality of first structures may have an ink-philic property
Implementation Method 3
a top surface of the bank may include an ink-repellent property
Data Source
AI summary
A color filter is provided. The color filter includes a substrate, a bank formed on a substrate to partition a plurality of pixel units into each other, a plurality of first structures formed on the pixel unit, and having a width narrower than a width of the pixel unit, and a height lower than a height of the bank, and an ink film filled in the pixel unit and having a height higher than the height of the first structures.