Capacitive Angle Detection for Rollable Display Hinges
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Solution Overview
Problem
Conventional methods for rolling and unrolling flexible displays in electronic devices are slow, power-hungry, and user-unfriendly, necessitating a more efficient way to estimate and adjust the unrolled area without motors.
Innovation Solution
A display device with a capacitive sensor system that determines the unrolled fraction of a rollable display by sensing a conductive pattern on the non-display side and using angular sensing to calculate the total rotated angle, allowing manual adjustment of the display area without motors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If motors are used to roll and unroll flexible displays, then the display can be adjusted, but the device becomes power-hungry and complex
Solution Approach 1:
The flexible display itself serves as the sensing element through its conductive layers. The display's own capacitive structure detects its position and rolling state without requiring external motors or complex actuation systems, eliminating power-hungry mechanical components while maintaining adjustability
Solution Approach 2:
The patent replaces mechanical motor-driven rolling systems with a capacitive sensing system that uses electrical fields to detect display position. The conductive layers in the flexible display create capacitive signals that indicate rolling state, substituting mechanical actuation with electrical field-based detection
2Ease of operation
If motors are used to control flexible displays, then precise control is achieved, but device cost increases
Solution Approach 1:
The conductive layers originally designed for touchscreen functionality serve dual purposes: they maintain their touch-sensitive properties while simultaneously acting as capacitive sensors for detecting display rolling position. This multi-functionality eliminates the need for separate sensing components, reducing device cost while maintaining precise control
Solution Approach 2:
The display structure provides its own sensing capability through its inherent conductive layers. No additional expensive sensors or control mechanisms are required, as the display's own electrical structure generates the signals needed for position detection and control
3Productivity
If conventional rolling methods are used, then display can be unrolled, but the process is slow and inefficient
Solution Approach 1:
The capacitive sensing system continuously monitors the display's rolling position and provides real-time feedback about the unrolled fraction. This feedback mechanism enables rapid detection of display state changes, allowing for fast and efficient unrolling control that enhances user experience without requiring slow mechanical systems
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 solution eliminates the need for motors, reduces device costs, and provides a user-friendly, efficient method for estimating and adjusting the unrolled area of flexible displays, enhancing user experience and device functionality.
Implementation Method 1
a capacitive sensor including a transmitter and a receiver electrode disposed within the housing and configured to sense the pattern
Data Source
AI summary
In an example, a display device includes a rollable display including a display side and an opposite non-display side. The rollable display includes a conductive material with a pattern disposed on the non-display side. The device includes a housing configured to house the rollable display and configured to roll in and roll out the rollable display along a first direction, and a capacitive sensor including a transmitter and a receiver electrode disposed within the housing and configured to sense the pattern.