Rollable OLED Display with Edge Strips for Landscape Orientation
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Solution Overview
Problem
Existing rollable display devices are limited to portrait orientation and cannot be easily converted to landscape orientation, restricting their versatility and usability in various applications.
Innovation Solution
A display device incorporating an OLED, a winder, a constant force spring, and strips that maintain the OLED straight when unwound, allowing for adjustable pulling-out lengths and orientations, enabling use in both portrait and landscape modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the display device is designed to be rollable and compact for mobile use, then portability is improved, but the ability to maintain straight OLED and achieve landscape orientation deteriorates
Solution Approach 1:
The display device employs dynamic characteristics of the OLED material itself, which can reversibly change from a curved rolled state to a straight unwound state. This inherent dynamic property allows the same compact structure to serve both portable rolled usage and landscape display usage without requiring separate mechanisms for each mode.
Solution Approach 2:
The invention utilizes parameter changes in the OLED's physical state - specifically the transition from a curved configuration when rolled to a straight configuration when unwound. This parameter change enables the display to adapt between different usage scenarios (portable vs. landscape) using the same hardware structure.
2Weight of moving object
If the OLED is wound up for compact storage, then portability is improved, but the display area and usability deteriorate
Solution Approach 1:
The OLED's dynamic ability to transition between wound and unwound states provides a solution where the display area can be expanded when needed while maintaining compact storage when not in use. The same material property that enables portability also enables full display area when unwound.
Solution Approach 2:
The display device follows a nesting principle where the OLED is wound inside the housing for compact storage, and can be unwound to expand the display area when needed. This nested structure allows the device to occupy minimal space when rolled while providing full display capability when unwound.
3Stability of the object's composition
If a fixing mechanism is added to maintain OLED straightness, then orientation stability is improved, but device complexity increases
Solution Approach 1:
The OLED itself provides the stability needed to maintain its straight configuration through its inherent material properties. When unwound, the OLED naturally maintains its shape without requiring complex external fixing mechanisms, as its physical state self-maintains the straight configuration.
Solution Approach 2:
The invention extracts and utilizes the inherent stability property of the OLED material itself, rather than adding separate stabilization mechanisms. The OLED's own physical characteristics provide the necessary stability to maintain straightness during landscape usage.
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 display device can be used in various orientations and lengths, enhancing its versatility and usability in different applications, while maintaining a compact and portable design.
Implementation Method 1
a constant force spring that applies a winding force of the OLED to the winder
Implementation Method 2
strips each disposed on a corresponding edge of the OLED in a direction in which the OLED extends and is unwound, the strips being rollable around the winder together with the OLED and maintaining the OLED straight when the OLED is unwound
Data Source
AI summary
A display device includes: an OLED; a winder that winds the OLED from one end of the OLED; a constant force spring that applies a winding force of the OLED to the winder; strips each disposed on a corresponding edge of the OLED in a direction in which the OLED extends and is unwound, the strips being rollable around the winder together with the OLED and maintaining the OLED straight when the OLED is unwound; and a fixing mechanism configured to release the OLED when the OLED is pulled out in a direction along a winding direction of the OLED around the winder, and fix the OLED so that the OLED is not wound when the OLED is pulled out in a direction along an unwinding direction of the OLED around the winder.