Rollable Display Position Detection Using Active Electrode
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Solution Overview
Problem
Rollable displays face challenges in detecting the unrolled position without increasing power consumption or adding additional electrical components or layers, which can lead to higher manufacturing costs and thicker displays.
Innovation Solution
A method and device that utilize an active electrode mounted in the housing to detect its position on a capacitive touchscreen, using a grid of capacitive electrodes to determine the unrolled position by transmitting signals and measuring capacitance changes, allowing for accurate position determination without additional components or layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional electrical components or layers are added to detect unrolled position, then detection reliability is improved, but manufacturing cost increases and display thickness increases
Solution Approach 1:
The capacitive touchscreen electrodes serve dual purposes: they function as both the touchscreen sensing layer and the position detection sensor. By transmitting detection signals through the existing touchscreen controller, the system eliminates the need for separate detection components while maintaining reliable position detection capability.
Solution Approach 2:
The rollable display uses its own touchscreen infrastructure to perform position detection. The touchscreen electrodes and controller that already exist in the display are repurposed to detect the unrolled position, allowing the system to self-diagnose its state without external or additional components.
2Reliability
If additional electrical components or layers are added to detect unrolled position, then detection reliability is improved, but power consumption increases
Solution Approach 1:
The touchscreen controller is utilized to perform both touchscreen operations and position detection functions. By sharing the existing controller resource, the system avoids adding separate detection circuitry that would consume additional power, thereby maintaining energy efficiency while achieving reliable detection.
3Adaptability or versatility
If rollable display position detection is implemented, then display functionality is improved, but manufacturing cost increases
Solution Approach 1:
The system uses the existing touchscreen electrode structure and controller for position detection, eliminating the need for separate detection components. This approach leverages already-manufactured elements, avoiding additional manufacturing steps and reducing overall production costs while enabling enhanced display functionality.
Solution Approach 2:
The touchscreen infrastructure serves dual purposes by also performing position detection. This self-service approach means no additional components need to be manufactured or assembled, thereby keeping manufacturing processes simple and costs low while adding sophisticated functionality.
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
Enables reliable and accurate detection of the unrolled position of rollable displays without increasing power consumption or display thickness, maintaining cost-effectiveness and flexibility.
Implementation Method 1
an active electrode configured to transmit a signal having a first frequency to be capacitively sensed by a capacitive touchscreen on the rollable display
Data Source
AI summary
A method for operating an electronic device, the method including: displacing a rollable touchscreen to a first position along a first direction, a first side of the rollable touchscreen being mounted in a housing, the rollable touchscreen being configured to be rolled into or unrolled out of the housing along the first direction, detecting an active electrode at a first location on the rollable touchscreen, the active electrode being mounted in the housing, and determining the first position of the rollable touchscreen based on the first location, the first positing being indicative of a fractional amount of the rollable touchscreen outside the housing.