Inkjet-Printed Bonding Layer for Display Light Leakage
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Solution Overview
Problem
The existing lamination processes for display devices face inefficiencies and reliability issues in bonding windows to display panels, particularly in achieving optimal adhesive properties and minimizing thickness while preventing light leakage.
Innovation Solution
A method involving the application of a first ink with high light transmittance and a second ink with lower light transmittance, applied using inkjet printing, forms a bonding layer with distinct light-transmitting and light-blocking areas, ensuring strong adhesion and efficient light management between the display panel and protection member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transparent liquid adhesive is used for bonding the window and display panel, then adhesion is achieved, but light leakage occurs and thickness cannot be minimized
Solution Approach 1:
The bonding layer is segmented into multiple regions with different light transmittance characteristics. The inkjet printing process applies adhesive material selectively to specific areas, creating zones with varying optical properties that prevent light leakage while maintaining necessary adhesion.
Solution Approach 2:
Different regions of the bonding layer are given different local qualities regarding light transmittance. Areas requiring light blocking receive adhesive material with lower transmittance, while areas requiring optical clarity maintain higher transmittance, achieving both adhesion and light leakage prevention.
2Length of stationary object
If the bonding layer thickness is reduced to minimize device thickness, then overall device thickness decreases, but adhesion strength and light leakage prevention become compromised
Solution Approach 1:
The bonding function is segmented across multiple regions rather than requiring uniform thickness throughout. This allows thin regions for minimal thickness and thicker regions for enhanced adhesion and light blocking where needed.
Solution Approach 2:
The inkjet printing process enables precise control of adhesive material parameters including thickness, composition, and distribution. By varying these parameters across different regions, the bonding layer achieves optimal performance for both thinness and reliability.
3Ease of manufacture
If uniform adhesive application is used for lamination, then manufacturing simplicity is maintained, but light leakage prevention and adhesion optimization are insufficient
Solution Approach 1:
The traditional mechanical uniform application method is replaced with inkjet printing technology, which uses digital control to deposit adhesive material with precise spatial and compositional accuracy, enabling region-specific adhesive properties.
Solution Approach 2:
The inkjet printing process allows dynamic adjustment of adhesive material parameters such as concentration, volume, and deposition pattern for different regions, achieving high manufacturing precision while maintaining process efficiency.
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 enhances the efficiency and reliability of the lamination process, reduces the thickness of the display device, and effectively prevents light leakage by using a bonding layer with specific light-transmitting and light-blocking properties.
Implementation Method 1
The first ink and the second ink are cured to form a bonding layer that is configured to bond the first substrate and the second substrate
Data Source
AI summary
A display panel includes a protection member disposed on the display panel. A bonding layer is disposed between the display panel and the protection member. The bonding layer is configured to bond the display panel and the protection member. The bonding layer includes a first area having a first light transmittance and a second area having a second light transmittance that is lower than the first light transmittance.