Foldable OLED Display Strain Sensing With Wheatstone Bridge
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Solution Overview
Problem
Current foldable light emitting display devices lack a reliable structure or method for detecting strain in the folded portion, with existing solutions often relying on expensive strain measurement equipment.
Innovation Solution
A light emitting display device incorporating a strain sensor with a Wheatstone bridge circuit structure in the folding region, connected to a gamma reference voltage portion and a controller for accurate strain measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If expensive strain measurement equipment is used to detect strain in the folded portion, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent uses the display panel itself as a strain sensor by incorporating a Wheatstone bridge circuit directly into the display structure. This eliminates the need for separate external strain measurement equipment, achieving accurate strain detection while reducing system complexity and cost. The display panel serves dual purposes: visual display and strain sensing.
Solution Approach 2:
The display panel is designed to perform multiple functions simultaneously: it serves as both the visual display component and the strain detection sensor. By integrating the Wheatstone bridge circuit within the display panel structure, the same component that displays images also measures strain in the folded portion, eliminating the need for dedicated measurement equipment.
2Reliability
If strain measurement equipment is integrated into the display device, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges the strain measurement function with the existing display panel structure by integrating a Wheatstone bridge circuit directly into the display. This combination approach incorporates strain sensing capability without adding separate measurement systems, thereby improving reliability while minimizing increases in overall device complexity.
3Measurement precision
If a Wheatstone bridge circuit is integrated into the display panel, then measurement precision is improved, but manufacturing complexity increases
Solution Approach 1:
The patent utilizes the existing electrical parameters and circuit architecture of the display panel to implement the Wheatstone bridge circuit. By leveraging the display's current manufacturing processes and electrical characteristics, the strain sensing function is integrated without requiring fundamentally new manufacturing techniques, thus maintaining ease of manufacture while achieving precise measurements.
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
Provides a cost-effective and efficient method to measure strain in foldable light emitting display devices, enhancing reliability and durability by accurately detecting morphological deformations.
Implementation Method 1
a strain sensor located in the folding region in the non-display region and having a Wheatstone bridge circuit structure
Implementation Method 2
a strain sensor located in the folding region in the non-display region and having a Wheatstone bridge circuit structure
Data Source
AI summary
A light emitting display device includes a display panel. The display panel includes a display region where pixels are arranged, a non-display region outside the display region, and a folding region extending along a direction. The display device includes a strain sensor located in the folding region in the non-display region and having a Wheatstone bridge circuit structure. The display device includes a gamma reference voltage portion providing an input voltage to the strain sensor. The display device includes a power supply portion providing a reference voltage to the gamma reference voltage portion. The display device includes a controller receiving an output voltage of the strain sensor.