Rollable Display Gear Assembly for Film Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In rollable display devices, the flexible display panel tends to misalign and develop defects like peeling and cracks due to relative pushing between films when wound around a roller, especially as the number of winding turns increases.
Innovation Solution
A rollable display device design featuring a rotatable roller, a fixing portion, and a rotating portion with a gear assembly that transfers torque, where the flexible display panel is wound in opposite directions between these components, minimizing relative pushing and preventing misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the flexible display panel is wound around the roller in one direction, then the display device can be compactly stored, but relative pushing between films occurs causing misalignment and defects
Solution Approach 1:
The patent applies reverse winding by configuring the flexible display panel to wind in opposite directions around the roller. Specifically, the first flexible display panel winds in a first direction while the second flexible display panel winds in a second direction opposite to the first direction. This inversion of the winding direction prevents cumulative relative pushing between films that occurs in single-direction winding, thereby maintaining film alignment integrity while achieving compact storage.
2Adaptability or versatility
If multiple films are stacked in the flexible display panel, then display functionality is enhanced, but relative pushing between films increases causing peeling and cracks
Solution Approach 1:
The patent configures multiple flexible display panels to wind in opposite directions around the roller. The first flexible display panel and the second flexible display panel are arranged such that their winding directions are opposite. This creates counterbalancing forces that prevent cumulative relative pushing between the stacked films, thereby maintaining strong adhesion and preventing peeling and cracks while preserving enhanced display functionality through multiple films.
3Productivity
If the number of winding turns is increased, then storage efficiency is improved, but relative pushing between films accumulates causing misalignment at the end
Solution Approach 1:
The patent implements opposite direction winding where the first flexible display panel winds in a first direction and the second flexible display panel winds in a second direction opposite to the first. This configuration allows for increased winding turns to improve storage efficiency while the opposite directions create counterbalancing effects that prevent cumulative relative pushing, thereby maintaining film alignment precision even with multiple winding turns.
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 design effectively prevents misalignment and defects such as peeling and cracks by offsetting the relative pushing between films, ensuring smooth winding and unwinding of the flexible display panel.
Implementation Method 1
a gear assembly including a plurality of gears installed in the roller, the fixing portion, and the rotating portion, wherein the plurality of gears is configured to transfer torque of the roller to the rotating portion
Data Source
AI summary
Provided is a rollable display device including a rotatable roller, a fixing portion surrounding the roller and including a first slit, a rotating portion surrounding the fixing portion and including a second slit, a gear assembly transferring torque of the roller to the rotating portion so that a rotation direction of the rotating portion is opposite to a rotation direction of the roller, and a flexible display panel. The gear assembly includes a plurality of gears installed in the roller, the fixing portion and the rotating portion. The flexible display panel includes a first area positioned between the roller and the fixing portion of which one end is fixed to the roller, a second area positioned to pass through the first slit, and a third area extended from the second area.