Rollable Display Winder Mechanism for Compact Manual Operation
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Solution Overview
Problem
Existing rollable display devices are large due to their link mechanisms and other components, making them less portable and efficient in both electrical and manual operations.
Innovation Solution
A compact rollable display device design that includes an OLED, a winder, a constant force spring for balanced winding force, a small motor for winding and unwinding, a drag mechanism using friction elements, and a weight for counterbalancing, allowing for both electrical and manual operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a link mechanism is used to enable manual operation, then the device can be operated manually, but the overall size becomes large
Solution Approach 1:
The patent extracts and eliminates the link mechanism from the system, replacing it with a drag mechanism that uses friction elements directly on the winder. This removal of unnecessary components reduces the overall device volume while maintaining manual operation capability through the drag mechanism's friction-based control
Solution Approach 2:
The winder is designed to serve multiple functions: it winds the OLED during electrical operation, allows manual unwinding through the drag mechanism, and provides friction-based control for both winding and unwinding operations. This multi-functionality eliminates the need for separate link mechanisms, reducing overall device size
2Power
If a large motor is used to overcome spring force, then the winding operation is effective, but the device size increases
Solution Approach 1:
The patent introduces a weight that applies a pull-out force to counterbalance the winding force of the constant force spring. This counterbalancing reduces the net force the motor must overcome, allowing a smaller motor to be used while maintaining effective winding operation
Solution Approach 2:
The drag mechanism with friction elements acts as an intermediary between the motor and the winder, providing controlled transmission of rotational force. This allows the motor to operate more efficiently with reduced peak power requirements, enabling the use of a smaller motor
3Adaptability or versatility
If friction elements are used for drag mechanism, then both electrical and manual operations are enabled, but slippage occurs
Solution Approach 1:
The drag mechanism uses friction elements that provide partial force transmission through controlled slippage. This partial action allows the system to accommodate both electrical and manual operations by permitting some slippage that enables manual unwinding while still providing sufficient friction control for operational versatility
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 design achieves a smaller overall size, enables efficient electrical and manual operation, and reduces the need for a large power source, while maintaining the OLED in a stable wound state without unnecessary frictional damage.
Implementation Method 1
a constant force spring that applies a winding force of the OLED to the winder
Implementation Method 2
a drag mechanism configured to transmit rotation between the motor and the winder via a friction element
Implementation Method 3
a weight at the other end of the OLED to apply a pull-out force that counterbalances the winding force by the constant force spring
Data Source
AI summary
A display device includes: an OLED; a winder that winds the OLED from one end of the OLED; a cover that keeps a winding space for the OLED between the winder and the cover; a constant force spring that applies a winding force of the OLED to the winder; a motor configured to give at least one of winding and unwinding forces of the OLED to the winder; a drag mechanism configured to transmit rotation between the motor and the winder via a friction element; and a weight at the other end of the OLED to apply a pull-out force that counterbalances the winding force by the constant force spring.