Dynamic Reference Voltage for Display Driver Abnormality Detection
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Solution Overview
Problem
Existing display drivers struggle to accurately determine abnormal voltage states due to a fixed reference voltage, leading to improper detection of voltage abnormalities in display panels.
Innovation Solution
A display driver with a dynamic reference voltage generation circuit that changes in each cycle, allowing the inspection circuit to compare the output signal voltage with varying reference voltages for precise abnormality detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed reference voltage is used to determine abnormal voltage states, then the device complexity is reduced, but the measurement precision deteriorates because abnormal states cannot be properly determined depending on output voltage values
Solution Approach 1:
The reference voltage is changed dynamically in each given cycle instead of being fixed, allowing the inspection circuit to adapt to different output voltage conditions and properly determine abnormal states
Solution Approach 2:
The reference voltage parameter is varied in each inspection cycle to match different output voltage levels, enabling accurate abnormal voltage detection across different operating conditions
2Measurement precision
If the reference voltage changes in each given cycle, then the measurement precision of abnormal voltage detection is improved, but the device complexity increases due to dynamic reference voltage generation
Solution Approach 1:
The reference voltage changes periodically in each given cycle, providing a systematic approach to adapt the reference voltage to different output voltage conditions without requiring complex real-time adjustment mechanisms
Data Source
AI summary
A display driver includes: a driver circuit that drives an electro-optical panel; an output terminal that outputs an output signal from the driver circuit; an output line that couples the output of the driver circuit and the output terminal; and an inspection circuit that detects an abnormality of the output signal output by the driver circuit to the output line by monitoring a voltage of the output signal. The inspection circuit determines whether the voltage of the output signal is abnormal by comparing the voltage of the output signal with a reference voltage whose voltage changes in each given cycle.