Electro-Optical Panel Strain Sensing for Liquid Crystal Thickness
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Solution Overview
Problem
Existing transparent liquid crystal panels face display failures due to luminance unevenness caused by changes in liquid crystal layer thickness, which existing strain sensors are unable to detect effectively, as they primarily focus on bending rather than layer thickness.
Innovation Solution
An electro-optical device with a first and second strain sensor element, each with a resistance member, electrically coupled through wiring, allowing for the detection of strain in the pixel area and outside the pixel area, enabling the estimation of liquid crystal layer thickness changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing strain sensors are used to detect bending of the display panel, then bending detection is achieved, but liquid crystal layer thickness change cannot be detected
Solution Approach 1:
The strain sensor is divided into multiple independent strain sensor elements arranged in a matrix pattern across the display panel. Each element independently detects strain in its local region, enabling precise measurement of liquid crystal layer thickness changes at different positions. This segmentation allows the sensor to specifically detect thickness changes in the pixel area while maintaining the ability to detect overall panel bending.
Solution Approach 2:
Strain sensor elements are selectively arranged with higher density in the pixel area compared to non-pixel areas. This local quality differentiation enables the system to prioritize detection of liquid crystal layer thickness changes in the display region while still maintaining capability for bending detection in other areas, thus resolving the contradiction between specialized thickness detection and general bending detection.
2Ease of manufacture
If strain sensor is placed outside the pixel area, then manufacturing is simplified, but strain in the display area cannot be detected
Solution Approach 1:
The strain sensor is segmented into multiple independent elements that can be placed in both pixel and non-pixel areas. This segmentation allows flexible arrangement where some elements are positioned in the pixel area to detect display area strain, while others are positioned outside to maintain manufacturing simplicity and provide reference measurements for overall panel deformation.
Solution Approach 2:
The strain sensor elements serve multiple functions: they detect both local strain in the pixel area (for liquid crystal layer thickness measurement) and strain in non-pixel areas (for bending detection and manufacturing simplicity). This multi-functionality resolves the contradiction by making the same sensor structure capable of both specialized and general detection tasks.
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 efficient detection of strain in the display area, preventing color unevenness by accurately monitoring the condition of the liquid crystal layer, thereby improving display quality.
Implementation Method 1
a first strain sensor element including a first resistance member, a second strain sensor element including a second resistance member
Data Source
AI summary
An electro-optical device includes an electro-optical panel that includes a first strain sensor element including a first resistance member and a second strain sensor element including a second resistance member that are provided in a pixel area, and a first wiring electrically coupling the first strain sensor element and the second strain sensor element, a first variable resistance member, a second variable resistance member, and a second wiring electrically coupling the first variable resistance member and the second variable resistance member.