Bendable Display Device Dual Substrate Positioning
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Solution Overview
Problem
Conventional light-emitting devices and display devices face challenges in achieving a balance between portability, reliability, non-breakability, and low power consumption, especially in flexible and bendable forms required for modern applications.
Innovation Solution
A bendable display device design featuring two flexible substrates with transistors, where one substrate is positioned on the inner side and the other on the outer side in bend portions, along with a bonding layer, to enhance mechanical strength and reliability, and the use of insulating layers and grid-patterned wirings for signal supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a flexible substrate is used to make the display device thin and lightweight, then portability is improved, but mechanical strength decreases making the device more prone to breaking
Solution Approach 1:
The patent uses a composite structure consisting of a flexible substrate combined with a rigid support substrate. The flexible substrate provides lightness and flexibility, while the rigid support substrate provides mechanical strength. This composite approach resolves the contradiction by combining materials with complementary properties to achieve both light weight and high strength.
2Ease of operation
If the display device is made bendable for portability, then ease of operation is improved, but reliability deteriorates due to repeated bending stress
Solution Approach 1:
The patent introduces a buffer layer as an intermediary between the flexible substrate and the functional layers. This buffer layer absorbs and distributes the stress generated during bending, protecting the transistor and other sensitive components from damage. The intermediary layer enables repeated bending while maintaining device reliability.
3Device complexity
If transistors are integrated on the flexible substrate for compactness, then device complexity is reduced, but manufacturing precision becomes more difficult to achieve
Solution Approach 1:
The patent segments the device into distinct functional regions: a flexible substrate region for lightness, a rigid support substrate region for mechanical strength and precision manufacturing, and a bonding region for integration. By separating the manufacturing of transistors on a rigid substrate from the final flexible assembly, the patent achieves both compact integration and high manufacturing precision.
Data Source
AI summary
A non-breakable display device, electronic appliance, or lighting device is provided. A bendable display device in which a first flexible substrate and a second flexible substrate provided with transistors overlap each other with a bonding layer therebetween is fabricated. The display device is bent so that the first substrate is positioned on the inner side (the valley side) and the second substrate is positioned on the outer side (the mountain side).