Inkjet Display Substrate with Impregnated Banks for Uniform Color Layers
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Solution Overview
Problem
Existing methods for forming color filters in liquid crystal displays using the inkjet method often result in uneven film thickness and light leakage due to surface tension and water repellency of the banks, leading to reduced display quality and potential color mixture between pixel regions.
Innovation Solution
The substrate features banks made of a resin material with controlled cure degrees, allowing the liquid material to impregnate and spread evenly, preventing regions from being unfilled and reducing color mixture, achieved through exposure and baking processes that create impregnated regions within the banks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the inkjet method is used to form color filters, then manufacturing cost is reduced and material usage is minimized, but film thickness becomes uneven and light leakage occurs
Solution Approach 1:
The bank structure is designed with different properties in different regions: the upper surface has water repellency to prevent ink overflow, while the inner peripheral area has a lower cure degree to enable ink impregnation and even spreading. This local differentiation resolves the contradiction by allowing cost-effective inkjet printing while achieving uniform film thickness through controlled ink distribution.
Solution Approach 2:
The cure degree of the resin material in the bank's inner peripheral area is specifically controlled to be lower than in other areas. This parameter change enables the resin to absorb and spread ink material uniformly, preventing both light leakage and color mixture while maintaining the low-cost inkjet manufacturing process.
2Manufacturing precision
If the amount of ink droplets is increased to cover peripheral areas, then film thickness is improved, but color mixture occurs between adjacent pixels
Solution Approach 1:
The bank is designed with spatially differentiated properties: water repellency on the upper surface prevents ink from spreading to adjacent pixels, while the lower cure degree in the inner peripheral area ensures sufficient ink absorption and even distribution. This allows achieving uniform film thickness without increasing ink amount that would cause color mixture.
Solution Approach 2:
The bank acts as an intermediary structure with dual functionality: it controls ink distribution within the pixel region through its inner peripheral area while simultaneously preventing ink overflow to adjacent regions through water repellency. This mediator role resolves the contradiction between achieving even film thickness and preventing color mixture.
3Object-generated harmful factors
If the banks have water repellency to prevent color mixture, then color purity is improved, but ink material does not spread evenly in pixel regions
Solution Approach 1:
The bank structure implements local quality differentiation: water repellency is applied to the upper surface to prevent color mixture, while the inner peripheral area has a lower cure degree that enables ink impregnation and even spreading. This resolves the contradiction by allowing both color purity and film thickness uniformity to be achieved through spatially differentiated properties.
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 ensures uniform film thickness and prevents light leakage and color mixture, enhancing display quality by maintaining the liquid material within pixel regions and preventing it from entering adjacent areas.
Implementation Method 1
the region with a lower cure degree than a resin material of other areas is formed on the resin material of an area to be in contact with the color layers through exposure
Implementation Method 2
the resin material with the lower cure degree becomes impregnated with the liquid material
Data Source
AI summary
Disclosed is a substrate for a display device, wherein generation of a region which is not filled with the components of a liquid material is suppressed by simple processes during the formation of color layers by a coating method such as an inkjet method using the liquid material, thereby achieving good display quality. Also disclosed are a method for manufacturing the substrate for a display device, and a display device. The substrate for a display device comprises, on a principal surface thereof, banks formed of a resin material, and color layers arranged in a plurality of pixel regions surrounded by the banks. The color layers are formed of the liquid material, and the bank is provided with an impregnated region containing the components of the liquid material.