Rollable Display Lift Assembly With Angle Sensing for Stable Unwinding
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Solution Overview
Problem
Existing display devices with flexible OLEDs face challenges in reliably and accurately unwinding from rollers, which affects their usability and reliability.
Innovation Solution
A display device design incorporating a lift assembly with a roller rotation mechanism and an angle sensor module, allowing for precise control of the flexible display's height and position, enabling reliable unwinding and rolling around a roller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a flexible display is rolled around a roller, then the display device can be made compact and portable, but the height sensing accuracy deteriorates due to instability during rolling
Solution Approach 1:
The patent introduces an upper assembly as an intermediary component between the flexible display and the roller. This upper assembly includes arms with sensors that indirectly measure the display height, providing stable measurement data even when the display is being rolled or unrolled, thus resolving the contradiction between compactness and sensing accuracy.
Solution Approach 2:
The patent replaces direct mechanical height measurement with an optical sensing system. Sensors mounted on the pivotable arms detect position information optically, converting mechanical movement into measurable signals that provide accurate height data during dynamic rolling operations.
2Difficulty of detecting and measuring
If sensors are directly mounted on the flexible display, then height detection is straightforward, but sensing reliability deteriorates under external forces
Solution Approach 1:
The patent segments the sensing system into separate components: the upper assembly with pivotable arms and sensors is separated from the flexible display. This segmentation allows the sensing mechanism to remain stable and isolated from external forces applied to the display, while still accurately measuring display height through geometric relationships.
3Ease of operation
If the flexible display is allowed to move freely, then ease of operation is improved, but stability deteriorates during rolling and unrolling
Solution Approach 1:
The patent employs a biasing member that applies a counteracting force to the upper assembly during rolling operations. This biasing force stabilizes the arms and sensors, preventing excessive movement or instability while allowing the flexible display to move freely for ease of operation.
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 high accuracy and reliability in unwinding and rolling the flexible display, enhancing its usability and stability, and allows for precise height control.
Implementation Method 1
a first sensor configured to detect an angle of the second arm based on a rotation of the driven gear
Implementation Method 2
a first magnetic member configured to magnetically engage the biasing member with the upper assembly
Data Source
Figure 1
Figure 2(a)~2(c)
Figure 3
AI summary
A display device includes: a housing; a roller rotatably disposed on the housing; a flexible display that is rolled around the roller or unrolled from the roller; a first arm connected to the flexible display; an arm supporter provided in the housing; an arm shaft rotatably supported to the arm supporter; a second arm coupled to the arm shaft and rotated together with the arm shaft to rotate the first arm; a rotation mechanism connected to the second arm to rotate the second arm about the arm shaft; and an angle sensor module connected to at least one of the arm shaft and the second arm.