Test Circuit for Electro-Optical Devices Reducing Power Consumption
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Solution Overview
Problem
The existing test circuits for electro-optical devices, such as liquid crystal display devices, consume excessive power due to repeated switching of transistors during both operation checks and normal driving, leading to increased power consumption.
Innovation Solution
A test circuit design that inverts the polarity of output signals from the driving circuit during operation checks and normal driving, utilizing a judging circuit to determine signal polarity and an amplifying circuit to reduce transistor switching, thereby minimizing power consumption without requiring a new signal system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the test circuit continuously monitors the driving circuit during normal driving, then the operation check capability is maintained, but the power consumption increases due to repeated transistor switching
Solution Approach 1:
The test circuit performs operation checks periodically or on-demand rather than continuously. The judging circuit activates only when a test signal is input, causing the amplifying circuit to operate periodically instead of continuously, thereby reducing power consumption while maintaining operation check capability when needed
Solution Approach 2:
The test function is extracted as a separate operational mode from normal driving. When testing is required, a test signal is input to activate the judging circuit, which then activates the amplifying circuit. During normal operation, the test circuit remains inactive, separating the testing function from continuous operation to reduce power consumption
2Reliability
If the test circuit is designed to detect output signals from the driving circuit, then the operation check function is achieved, but the device complexity increases
Solution Approach 1:
The test circuit shares the same signal path and components with the normal driving circuit. The amplifying circuit and judging circuit can process both test signals and normal output signals, making the circuit multi-functional without requiring separate dedicated test components, thus achieving operation check function without significantly increasing device complexity
Solution Approach 2:
The test circuit components (amplifying circuit and judging circuit) are merged with the existing driving circuit structure. The output signal line is shared between normal operation and test mode, and the judging circuit integrates with the existing signal processing path, combining testing functionality with the existing circuit to minimize additional complexity
Data Source
AI summary
A test circuit for detecting an output signal from a driving circuit includes a judging circuit which outputs a detection signal when the output signal output from the driving circuit has one polarity, but does not output the detection signal when the output signal has the other polarity, and an amplifying circuit which amplifies the signal from the judging circuit.