Flexible Display Warpage Sensing via Capacitance Variation
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Solution Overview
Problem
Flexible display devices face challenges in accurately measuring and sensing warpage, which is crucial for maintaining image quality and user interaction, especially when bent, as existing technologies lack effective methods to quantify and handle warpage events.
Innovation Solution
A flexible display device with a conductive layer on an insulating film and a spacer to maintain distance, allowing the touch screen to contact the conductive layer when bent, measuring warpage by detecting variations in electrostatic capacitance between electrode patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the flexible display device is bent to enable flexibility and portability, then the device can be easily carried and applied to various devices, but warpage occurs which degrades image quality and affects user interaction
Solution Approach 1:
The patent applies preliminary action by pre-establishing a warpage sensing system using electrode patterns and a conductive layer that can detect warpage before it significantly degrades image quality or user interaction. The system proactively measures warpage conditions and enables the device to take corrective actions or adjust operations to maintain reliability during flexible bending operations
2Device complexity
If existing technologies are used without warpage sensing capability, then the device structure remains simple, but warpage cannot be measured or handled leading to degraded performance
Solution Approach 1:
The patent applies universality by designing the electrode patterns to serve dual functions: their primary function for the touch screen operation and their secondary function as warpage sensing elements. The conductive layer similarly serves both as part of the touch sensing structure and as a reference element for warpage detection. This multi-functionality approach enables warpage measurement without adding separate dedicated sensing components, thus maintaining structural simplicity while gaining reliability
3Length of stationary object
If the touch screen unit is placed close to the insulating film for compact design, then the device thickness is reduced, but the gap between them becomes insufficient leading to inaccurate warpage measurement
Solution Approach 1:
The patent applies the intermediary principle by introducing a conductive layer as a mediator between the touch screen unit and the insulating film. This conductive layer serves as an intermediate sensing element that can detect changes in the gap distance caused by warpage. The electrode patterns on the touch screen unit interact with this intermediary conductive layer to measure warpage accurately, even when the overall device thickness is minimized. The intermediary layer amplifies the measurable effect of warpage while allowing compact design
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 precise measurement and handling of warpage events, improving image quality and user interaction by quantifying warpage and allowing for appropriate handling in both X and Y axes directions.
Implementation Method 1
measuring warpage by detecting variations in electrostatic capacitance between electrode patterns
Data Source
AI summary
A flexible display device includes: a flexible display unit configured to display an image; a flexible touch screen unit disposed over the flexible display unit; an insulating film interposed between the flexible display unit and the flexible touch screen unit, and a spacer formed between the flexible touch screen unit and the insulating film in order to maintain a distance between the flexible touch screen unit and the insulating film. A conductive layer is further formed over the insulating film and configured to touch the flexible touch screen unit when the flexible display device is bent. A degree of warpage of the flexible display device can be measured and thus can be utilized in various warpage events of the flexible display device by using warpage values.