Gate Signal Distortion Detection in Display Devices
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Solution Overview
Problem
Display devices, such as liquid crystal and organic light emitting display devices, face challenges in detecting distorted gate signals, which can lead to defects and reduced driving reliability.
Innovation Solution
A display device with a detection circuit that compares voltage differences between gate signals and a reference voltage to determine if the signals are normal, using comparators and a reference voltage generator to identify any distortions, thereby improving the reliability of the driving mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a detection circuit is added to detect distorted gate signals, then the reliability of the display device is improved, but the device complexity increases
Solution Approach 1:
The detection circuit is merged with the existing gate driving circuit by sharing the same signal lines and power supply. The detection circuit uses the same gate signals that are already being generated, and both circuits share common resources such as the power supply voltage and reference voltage generator, thereby adding detection capability without proportionally increasing overall system complexity
Solution Approach 2:
The gate driving circuit is designed to serve dual functions: driving the display panel and detecting signal distortions. The detection circuit can detect various types of abnormalities including distorted gate signals, short circuits, and open circuits using the same hardware infrastructure, making the detection mechanism multi-functional and reducing the need for separate dedicated detection hardware for each fault type
2Measurement precision
If voltage comparison detection is implemented to detect distorted gate signals, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
A reference voltage generator is introduced as an intermediary element to provide a stable comparison基准 for detecting gate signal distortions. The reference voltage serves as a mediator between the gate signal and the comparator, enabling precise detection of voltage deviations without requiring complex direct measurement circuits. The comparator unit then compares the gate signal voltage against this reference voltage to detect abnormalities
Solution Approach 2:
The patent replaces complex mechanical or analog measurement systems with electronic voltage comparison using comparator units. Instead of using sophisticated physical measurement devices to detect signal distortions, the system uses electronic circuits that compare voltage levels digitally, achieving high measurement precision through electronic means rather than mechanical or complex analog methods
Data Source
AI summary
A display device includes a display panel including a plurality of pixels, a gate driving circuit outputting a plurality of gate signals to the pixels, and a detection circuit receiving a first gate signal and a second gate signal among the gate signals, comparing a first voltage difference between a first high voltage of the first gate signal and a reference voltage with a second voltage difference between a second high voltage of the second gate signal and the reference voltage to obtained a compared result, and determining whether the first and second gate signals are normal signals based on the compared result.