Stretchable Display Compensation Using Strain Sensor Sub-Areas
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Solution Overview
Problem
Existing stretchable display apparatuses face challenges in maintaining display quality when their shape is changed, as the distance between pixels alters, affecting luminance and other characteristics.
Innovation Solution
A display apparatus with a strain sensor layer and a stretch compensation unit that divides the display area into sub-areas, generates comparison data by sensing line measurements, and adjusts image data to compensate for stretching effects, using look-up tables and voltage control to maintain display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the shape of the display apparatus is changed to achieve stretchability, then the adaptability and versatility are improved, but the distance between pixels changes causing degradation in display quality and luminance consistency
Solution Approach 1:
The display area is divided into multiple sub-areas based on the grid pattern formed by sensing lines. This segmentation allows independent measurement and compensation control for each sub-area, enabling precise maintenance of display quality even when the overall display apparatus is stretched or deformed.
Solution Approach 2:
The sensing lines continuously monitor the physical state of the display apparatus by detecting changes in resistance or capacitance caused by stretching. This feedback information is used to dynamically adjust the driving parameters of pixels in real-time, compensating for distance changes and maintaining consistent luminance and display quality.
2Reliability
If strain sensor lines are added to measure stretching state, then the ability to compensate for display quality degradation is improved, but the device complexity increases
Solution Approach 1:
The sensing lines serve multiple functions: they act as both structural elements of the display apparatus and as sensors for measuring stretching state. By utilizing existing conductive pathways for dual purposes, the system achieves reliable stretching detection without adding separate dedicated sensing components, thus limiting the increase in device complexity.
Solution Approach 2:
The system exploits changes in electrical parameters (resistance, capacitance) of the sensing lines in response to mechanical deformation. This allows the sensing function to be integrated into the existing electrical infrastructure of the display apparatus, using standard voltage application and measurement circuits rather than requiring complex specialized sensing hardware.
Data Source
AI summary
A display apparatus includes a display layer including a display area and a non-display area outside the display area, a strain sensor layer including first sensing lines extending in a first direction in the display area and second sensing lines extending in a second direction in the display area, a display driving unit configured to provide image data to the plurality of pixels, and a stretch compensation unit configured to divide the display area into a plurality of sub-areas, to generate comparison data obtained by comparing a measurement voltage value with a reference voltage value for each of the first sensing lines and the second sensing lines, and to generate stretch compensation data correcting the image data in a unit of sub-areas based on the comparison data.