Display Driver Fault Detection Circuit for Voltage Fixation
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Solution Overview
Problem
Existing display drivers cannot detect faults in the circuit that generates driving voltages for liquid crystal display panels, such as a fixed voltage value on source lines, despite the ability to detect polarity inversion signal faults.
Innovation Solution
A display driver with a fault detection circuit that binarizes pixel driving voltages using a threshold voltage and compares signals from different pixel data pieces during non-display periods to identify matching signals indicative of a fault, allowing for the detection of fixed voltage values on source lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polarity inversion abnormality detection part is added to detect polarity inversion signal faults, then the reliability of polarity inversion signal transmission is improved, but the device complexity increases and faults in voltage generation circuits remain undetected
Solution Approach 1:
The fault detection circuit is designed to perform multiple detection functions: it detects both polarity inversion signal abnormalities and voltage fixation faults in the output amplifier and D/A converter by analyzing the relationship between pixel data and pixel driving voltages during non-display periods
Solution Approach 2:
The fault detection circuit acts as an intermediary that monitors the relationship between input pixel data and output pixel driving voltages without interfering with normal display operations, using non-display periods to inject test signals and detect circuit health
2Reliability
If fault detection is performed during display periods, then fault detection speed is improved, but display quality deteriorates due to interference with normal pixel driving
Solution Approach 1:
The fault detection is performed periodically during non-display periods (vertical blanking intervals) when no pixel data is being displayed, allowing the system to inject test pixel data and analyze output voltages without interfering with normal display operations
Solution Approach 2:
The fault detection circuit performs preliminary checks during non-display periods by analyzing the relationship between pixel data and pixel driving voltages before the next display period begins, ensuring display quality is not compromised
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
Enables the detection of faults in pixel driving voltages applied to each source line of a display panel during normal operation, ensuring timely fault notification and maintaining display functionality.
Implementation Method 1
The fault detection circuit binarizes each of a first pixel driving voltage and a second pixel driving voltage with a predetermined threshold voltage to obtain a first signal and a second signal
Data Source
AI summary
A display driver according to the present invention includes a control part and a fault detection circuit. The control part sequentially incorporates first fault detection data and second fault detection data into a video signal during non-display periods of the video signal. The fault detection circuit binarizes each of a first pixel driving voltage and a second pixel driving voltage with a predetermined threshold voltage to obtain a first signal and a second signal. The first pixel driving voltage is generated based on the first fault detection data. The second pixel driving voltage is generated based on the second fault detection data. The fault detection circuit determines whether the first signal and the second signal match and outputs a fault detection signal that indicates a presence of a fault when the first signal and the second signal match.