Display Device with Feedback Pattern Verification for Industrial Control
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Solution Overview
Problem
Existing display devices lack a reliable method to verify the correctness of the image output and prevent false triggering during touch input detection, particularly in industrial control systems where safety is critical.
Innovation Solution
A display device with a two-dimensional matrix of light-emitting elements and feedback elements, where an evaluation device compares feedback patterns with target control patterns to determine normal or error reactions, and includes sensor devices to detect touch or deformation of a front cover, enhancing reliability and preventing false triggers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single sensor device is used for both calibration and touch input detection, then hardware cost is reduced, but reliability is compromised due to inability to differentiate between touch and deformation
Solution Approach 1:
The patent divides the sensing function into two separate sensor devices: one dedicated to calibration and another to touch input detection. This segmentation allows each sensor to be optimized for its specific function and enables reliable differentiation between calibration events and user touches, resolving the reliability issue while maintaining cost-effectiveness through shared hardware infrastructure.
Solution Approach 2:
The calibration sensor device serves multiple purposes: it performs initial calibration of the display and also detects front cover deformations. By making this sensor multi-functional, the patent reduces the need for additional dedicated deformation sensors, thereby lowering hardware costs while maintaining system reliability through the differentiated sensing capabilities.
2Ease of operation
If an elastically deformable front cover is used, then touch detection capability is enhanced, but false triggering occurs due to inability to distinguish touch from deformation
Solution Approach 1:
The patent introduces a second sensor device as an intermediary that specifically detects front cover deformations. This intermediary sensor provides additional information that helps the evaluation device distinguish between intentional touches and unintentional deformations, thereby reducing false triggering while preserving the enhanced touch detection capability provided by the deformable front cover.
Solution Approach 2:
The patent implements a feedback mechanism where the evaluation device receives signals from both sensor devices and uses this combined information to determine whether to trigger an input response. The feedback from the deformation sensor allows the system to adjust its response based on the detected condition, preventing false triggers while maintaining accurate touch detection.
3Reliability
If feedback elements are used to monitor light-emitting element states, then image correctness verification is enabled, but device complexity increases
Solution Approach 1:
The patent merges the feedback elements with the existing light-emitting element structure, integrating the monitoring function into the display pixels themselves. This integration approach enables image correctness verification without requiring separate external monitoring hardware, thereby reducing overall device complexity while maintaining the reliability benefit of continuous image output verification.
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 enables a fail-safe output and input device that reliably verifies image correctness and prevents false triggering, suitable for industrial control systems by differentiating between touch and deformation, ensuring accurate and safe operation.
Implementation Method 1
the front cover is designed to be partially reflective or scattering and light signals emitted by the light-emitting elements are partially reflected or scattered into the light sensors by means of the front cover
Implementation Method 2
the front cover is designed to be partially reflective or scattering and light signals emitted by the light-emitting elements are partially reflected or scattered into the light sensors by means of the front cover
Implementation Method 3
The front cover can be designed in particular as an elastically deformable front cover
Data Source
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AI summary
The device has luminous elements (8) and feedback elements (7) e.g. light sensors, arranged in cells (7). A controlling unit (9) controls the luminous elements in accordance with a set point control pattern (Mstar). An evaluation unit (11) determines a feedback pattern based on feedback signals (R) and compares the patterns with each other. The evaluation unit produces a normal reaction when the feedback pattern is in agreement with the control pattern and produces a fault reaction that differs from the normal reaction when the feedback pattern is in disagreement with the control pattern. The luminous elements are selected from TFTs or luminous LCDs.