Seal Portion with Light Shielding Core for Display Devices
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Solution Overview
Problem
Existing display devices with a configuration using a sealing material on a light shielding unit formed of stacked color filters face issues with moisture permeability and adhesion, especially as the size is reduced.
Innovation Solution
A display device configuration featuring a first substrate with a display area, a second substrate with a transparent material, and a seal portion that includes a core with a light shielding material and a covering member with a sealing material, where the first and second substrates are sealed with the covering member's surface acting as the contact surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a sealing material is applied onto a light shielding unit formed of stacked color filters, then light shielding performance is achieved, but moisture permeability increases due to the high moisture permeability of color filter materials
Solution Approach 1:
The seal portion is constructed as a composite structure with a core made of light shielding material and a covering member made of sealing material. This composite design allows the sealing material to provide low moisture permeability while the light shielding material maintains optical performance, resolving the contradiction between moisture protection and light shielding.
Solution Approach 2:
The seal portion is divided into two functional segments: the core (light shielding material) and the covering member (sealing material). Each segment performs its specific function - the core provides light shielding while the covering member provides moisture protection - allowing both requirements to be satisfied simultaneously.
2Strength
If light shielding performance is imparted to a sealing material, then adhesion is improved, but the sealing region must be made smaller which reduces adhesion area
Solution Approach 1:
The seal portion is segmented into a core and a covering member, where the covering member is specifically designed to contact the substrates. This segmentation allows the sealing region to be enlarged to improve adhesion, while the core provides the necessary light shielding functionality without compromising the adhesion area.
3Object-affected harmful factors
If a frame-shaped member is prepared separately from the substrate and bonded to the substrate, then light shielding performance is achieved, but device complexity and cost increase
Solution Approach 1:
The light shielding function and sealing function are merged into a single integrated seal portion structure. The core provides light shielding while the covering member provides sealing, eliminating the need for a separate frame-shaped member and reducing structural complexity.
Solution Approach 2:
The seal portion serves multiple functions simultaneously: it provides light shielding (through the core), sealing/moisture protection (through the covering member), and structural support. This multi-functionality eliminates the need for separate components, reducing device complexity.
Data Source
AI summary
A display device includes: a first substrate including a display area including display elements arranged in a matrix; a second substrate including a transparent material; and a seal portion placed so as to surround a periphery of the display area, wherein the seal portion includes a core including a light shielding material and a covering member including a sealing material, and the first substrate and the second substrate are sealed while a surface of the covering member in the seal portion serves as a contact surface.