Flexible Display Bending Detection via Drive Element Current
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Solution Overview
Problem
Flexible display devices face issues with brightness or color changes when the screen is bent due to changes in drive element characteristics, and existing methods struggle to distinguish between bending-induced and other factor-induced changes, with large detected currents being a further problem.
Innovation Solution
A flexible display device with a bendable panel, scanning lines, data lines, and pixel circuits, including a bending detection unit that measures current through the drive element to detect the bending state and a correction unit to adjust video signals based on this detection, preventing changes in brightness or color.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the screen is bent to achieve flexibility, then the display device becomes bendable and portable, but the drive element characteristics change causing brightness or color to change
Solution Approach 1:
The patent implements a feedback mechanism where the current through the drive element is continuously measured and fed back to a bending detection unit. This detected bending state is then used to correct video signals in real-time, compensating for brightness or color changes and maintaining display quality during bending operations.
Solution Approach 2:
The patent changes the parameters of the video signal based on the detected bending state. By adjusting video signal parameters according to the bending degree, the system compensates for drive element characteristic changes and maintains consistent brightness and color output during flexing.
2Difficulty of detecting and measuring
If conventional sensing methods are used to detect bending, then some bending information can be obtained, but it is impossible to distinguish between TFT characteristics change caused by bending and other factors
Solution Approach 1:
The patent uses the drive element current as an intermediary parameter to detect bending state. By measuring the current through the drive element and using it as a mediator to infer bending information, the system can distinguish bending-induced characteristic changes from other factors, as the current directly reflects the drive element's operational state under bending conditions.
3Difficulty of detecting and measuring
If organic TFT is used as sensor element to detect bending, then bending information can be obtained, but the amount of detected current is large
Solution Approach 1:
The patent makes the drive element serve multiple functions: it acts as both the drive element for controlling the light emitting element and as a sensor element for detecting bending state. By measuring the current through this multi-functional drive element, the system obtains bending information without requiring separate sensor circuits, thereby minimizing the detected current amount while maintaining detection capability.
Data Source
AI summary
An organic EL panel 10 is a bendable display panel including a plurality of pixel circuits 60 each having a light emitting element and a drive element. A data line drive circuit 15 performs, by driving data lines, an operation of writing a voltage to a control terminal of the drive element and an operation of measuring a current flowing through the drive element for the pixel circuits 60 selected by a scanning line drive circuit 14. A bending detection unit 90 detects a bending state of the organic EL panel 10 based on a measurement result of the current flowing through the drive element. A correction unit 80 corrects a video signal VS1 based on the detected bending state. With this, the bending state of a screen is detected and a change in brightness or color when the screen is bent is prevented.