Rollable Display Tape Spring Drum for Gap-Free Stable Retraction
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Solution Overview
Problem
Existing rollable display devices face issues with gaps and slips in the tape spring, leading to unstable movement and reduced durability due to friction and weight, which affect the quality and functionality of the display device.
Innovation Solution
The display device incorporates a tape spring with guide holes and a tape spring drum featuring guide protrusions, along with rotary pins and sub-rollers, to stabilize the winding and unwinding process, minimizing gaps and slips, and reduces friction and weight by using a flat spring to press the rotary pins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a tape spring is used to move the display part in a rollable display device, then the display device can achieve compact form factor and flexibility, but gaps and slips occur in the tape spring leading to unstable movement
Solution Approach 1:
The tape spring is divided into multiple segments with guide holes, and the drum is divided into segments with guide protrusions. This segmentation allows for precise positioning at intervals while maintaining overall flexibility, preventing gaps and slips during retraction and extension movements.
Solution Approach 2:
Guide protrusions on the drum act as intermediaries that engage with guide holes in the tape spring segments. This intermediary mechanism ensures precise positioning and prevents lateral displacement, resolving the contradiction between flexibility and movement stability.
2Manufacturing precision
If the tape spring is wound tightly on the drum to prevent gaps, then positioning precision improves, but friction increases and weight increases
Solution Approach 1:
By segmenting the tape spring and drum with guide holes and protrusions, precise positioning is achieved at specific intervals without requiring continuous tight winding. This reduces the overall friction and weight while maintaining positioning precision where needed.
Solution Approach 2:
The guide protrusions and holes provide localized positioning precision at specific points along the tape spring, rather than requiring uniform tight winding throughout. This local quality approach reduces overall friction and weight while maintaining necessary positioning accuracy.
3Reliability
If guide protrusions and holes are added to the tape spring and drum, then gaps and slips are suppressed, but device complexity increases
Solution Approach 1:
The guide holes and protrusions create a segmented structure that provides precise positioning functionality. While this adds some complexity, it enables reliable gap and slip prevention through a relatively simple geometric feature rather than a complex mechanical system.
Solution Approach 2:
The guide protrusions and holes change the geometric parameters of the tape spring and drum system, enabling precise positioning and gap prevention through simple dimensional features rather than complex mechanical mechanisms, thus limiting the increase in device complexity.
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 solution ensures precise control over the movement of the display part, stabilizes the tape spring operation, and enhances the durability and quality of the display device by preventing gaps and slips, while reducing weight and friction.
Implementation Method 1
a tape spring drum to which one end of the tape spring is fixed, the tape spring drum being configured to wind or unwind the tape spring and including a plurality of guide protrusions, and a plurality of rotary pins spaced apart from the tape spring drum and disposed along an outer peripheral surface of the tape spring drum
Implementation Method 2
a plurality of rotary pins spaced apart from the tape spring drum and disposed along an outer peripheral surface of the tape spring drum
Implementation Method 3
a plurality of sub-rollers coupled to the plurality of rotary pins, and a plurality of a flat spring configured to press the plurality of rotary pins
Data Source
AI summary
A display device can include a display part having a display panel configured to display an image, a first roller configured to wind or unwind the display part, a tape spring disposed on a rear surface of the display part, configured to move the display part in an upward/downward direction, and including a plurality of guide holes, and a second roller configured to wind or unwind the tape spring. The second roller includes a tape spring drum to which one end of the tape spring is fixed. The tape spring drum is configured to wind or unwind the tape spring and includes a plurality of guide protrusions. The second roller further includes a plurality of rotary pins spaced apart from the tape spring drum and disposed along an outer peripheral surface of the tape spring drum.