Stretchable Display Driving Circuit with Piezoresistive Sensor
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Solution Overview
Problem
Stretchable displays face image distortion and resolution changes when stretched, as the number of pixels per unit area decreases, leading to undesirable changes in image quality and luminance.
Innovation Solution
A driving circuit for stretchable displays that incorporates a stretch-sensitive sensor with materials whose resistance characteristics change with tensile force, allowing data signal transfer only after a certain stretching force is applied, ensuring that light-emitting elements are driven only when the display is stretched, thus maintaining resolution and preventing distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the stretchable display is stretched, then the display can be adapted to different shapes and sizes, but the pixel resolution changes and image distortion occurs
Solution Approach 1:
The patent applies dynamics by making the light-emitting element's emission state changeable based on the stretching condition. The display transitions from a static emission state to a dynamic one where emission is controlled according to the stretched state, resolving the contradiction between shape adaptability and resolution maintenance
Solution Approach 2:
The patent changes the emission parameter of the light-emitting element based on the stretching force detected by the sensor. By adjusting the emission state (on/off) according to the physical parameter change (stretching force), the system maintains resolution while adapting to different shapes
2Reliability
If all light-emitting elements are kept on before stretching, then the display maintains continuous image output, but power consumption increases unnecessarily
Solution Approach 1:
The patent performs preliminary action by detecting the stretching force before the stretching operation and preemptively controlling the emission state of light-emitting elements. This advance detection and control prevents unnecessary power consumption while ensuring image continuity is maintained when needed
Solution Approach 2:
The display system serves itself by using the stretching force detection to automatically control its own emission state. The sensor detects the stretching condition and the controller automatically adjusts light-emitting element operation, eliminating the need for external control and optimizing power usage
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
The solution effectively prevents image distortion and maintains resolution even when the display is stretched, while also reducing power consumption by turning off light-emitting elements before stretching, ensuring optimal image quality and efficient power use.
Implementation Method 1
a stretch-sensitive sensor that is connected with the switching transistor between the driving part and the data line, and the stretch-sensitive sensor may include a stretch-sensitive material whose resistance characteristic changes depending on a stretching force applied to the stretchable display
Data Source
AI summary
Disclosed is a driving circuit of a stretchable display capable of being stretched, which includes a driving part that includes a driving transistor connected with a light-emitting element and drives the light-emitting element depending on a signal of a data line, a switching transistor that is connected between the driving part and the data line and includes a gate terminal connected with a first gate line, and a stretch-sensitive sensor that is connected with the switching transistor between the driving part and the data line, and the stretch-sensitive sensor may include a stretch-sensitive material whose resistance characteristic changes depending on a stretching force applied to the stretchable display.