Wavelength Control Layer Layout for Precise Inkjet Pixel Separation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display devices suffer from defects due to ink loss or mislanding during the inkjet process, which affects display quality.
Innovation Solution
A display device design featuring a substrate with emission areas of different colors, a color filter layer, and a wavelength control layer with a bank layer and wavelength control structure, including openings and bank holes to prevent ink misplacement and improve display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional inkjet process is used to form wavelength control structures, then manufacturing simplicity is maintained, but ink loss or mislanding occurs leading to display defects
Solution Approach 1:
The bank layer is divided into multiple segments (first bank, second bank, third bank) that are spatially separated by bank holes. This segmentation allows independent control of inkjet deposition in each region, preventing ink mislanding between adjacent sub-pixels while maintaining manufacturing feasibility through sequential processing
Solution Approach 2:
The bank holes act as intermediary structures between adjacent openings. These bank holes serve as physical barriers and visual guides during inkjet deposition, mediating the ink placement process to prevent ink from one opening from contaminating adjacent openings, thereby improving ink placement precision without requiring complex real-time control systems
2Productivity
If openings are placed close together to increase pixel density, then productivity is improved, but ink mislanding between adjacent openings increases
Solution Approach 1:
The bank layer is segmented into multiple independent bank structures (first bank, second bank, third bank) with bank holes between them. This segmentation creates distinct deposition zones that can be processed independently, allowing high pixel density through close spacing of openings while preventing ink contamination through the separating bank holes
Solution Approach 2:
Different regions of the bank layer are assigned different functions: the first bank and second bank define opening boundaries, while the third bank specifically addresses ink overflow from the first opening. This local quality differentiation allows targeted solutions for specific ink mislanding problems while maintaining overall high pixel density
3Manufacturing precision
If bank holes are added to prevent ink misplacement, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The bank layer serves multiple functions simultaneously: it defines the boundaries of openings, creates bank holes for inkjet guidance, prevents ink overflow between sub-pixels, and provides a structural foundation for the wavelength control structure. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while improving ink placement precision
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
The design prevents ink misplacement during manufacturing, enhancing display quality by maintaining precise color separation and light transmission efficiency.
Implementation Method 1
a first wavelength conversion material dispersed in the first base resin and converting a peak wavelength of light into the peak wavelength of light of the first color
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A display device includes a first substrate (110) including a first emission area (TA1) emitting light of a first color, a second emission area (TA2) emitting light of a second color having a peak wavelength shorter than a peak wavelength of light of the first color, and a light blocking area (BA) which blocks light; a color filter layer (CFL) disposed on a surface of the first substrate (110); and a wavelength control layer (320) disposed on the color filter layer (CFL) and including a bank layer (BK) and a wavelength control structure (321). The bank layer (BK) is disposed in the light blocking area (BA) on the color filter layer (CFL) and includes a first opening (OP1), a second opening (OP2) and a bank hole (HA). The wavelength control structure (321) is disposed in a first opening (OP1) and the second opening (OP2) of the bank layer (BK), the first opening (OP1), the second opening (OP2), and the bank hole (HA) are spaced apart from each other, and the bank hole (HA) surrounds an edge of the first opening.