Inspection Switch Element for Drive Circuit Abnormality Detection
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Solution Overview
Problem
Current methods for detecting abnormal operation in liquid crystal display apparatuses, such as visual checking or using sensors, are time-consuming and increase failure rates due to added complexity and power consumption, making real-time monitoring impractical.
Innovation Solution
An electro-optical apparatus with an array substrate, scanning and image signal lines, pixel switch elements, and an abnormality detection circuit unit that uses an inspection switch element to detect voltage deviations from a predetermined range, improving the detection rate of drive circuit abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If visual checking or camera-based methods are used to detect display abnormality, then the detection method is simple to implement, but a large time delay occurs and real-time monitoring is not achieved
Solution Approach 1:
The patent applies preliminary action by performing abnormality detection during the activation period of the drive output, before normal operation continues. The inspection switch element is activated during specific time periods to check for abnormalities proactively, enabling real-time detection without delaying operation. This resolves the contradiction by making detection instantaneous rather than post-hoc.
2Measurement precision
If photo sensors or capacitance sensors are added to each pixel to directly determine pixel state, then detection precision is improved, but device complexity increases and failure rate increases
Solution Approach 1:
The patent extracts the abnormality detection function from the pixel level and implements it at the drive circuit level using an inspection switch element. Instead of adding sensors to every pixel, the inspection switch element is connected to the drive output and monitors abnormalities centrally. This reduces device complexity while maintaining detection precision by monitoring at the source of the signal.
Solution Approach 2:
The inspection switch element acts as an intermediary between the drive output and the abnormality detection circuit. It monitors the drive output signal without requiring direct connection to each pixel, thereby reducing circuit complexity while still enabling precise detection of drive circuit abnormalities that would affect pixel operation.
3Reliability
If photo sensors or capacitance sensors are added to each pixel, then detection capability is improved, but power consumption increases due to decreased transmittance
Solution Approach 1:
The patent extracts the detection function from the optical path (pixel level) and relocates it to the electrical domain (drive circuit level). The inspection switch element monitors electrical signals from the drive output, eliminating the need for optical sensors that would block light and increase power consumption. This maintains detection capability while removing the energy penalty of added optical components.
4Measurement precision
If sensors are added to every pixel to monitor operation, then detection precision is improved, but the shape change of liquid crystal display apparatus increases
Solution Approach 1:
The patent extracts the detection functionality from the display screen area by implementing it in the drive circuit region. The inspection switch element and abnormality detection circuit are located in the peripheral portion rather than distributed across the display area. This maintains detection precision while preserving the original shape and form factor of the display apparatus.
Data Source
AI summary
A display apparatus includes: an inspection TFT of which a drive output of a gate driver circuit is connected to a gate electrode and a drive output of a source driver circuit is connected to a source electrode; and an abnormality detection circuit unit that receives an output from a drain electrode of the inspection TFT to detect an abnormality of the gate driver circuit or the source driver circuit, and, in a period in which the drive output of the gate driver circuit is high, the abnormality detection circuit unit determines as abnormal when an output voltage from the drain electrode of the inspection TFT is out of a predetermined voltage range.