Source Driver Circuit for Adjacent Data-Line Short Detection
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Solution Overview
Problem
Existing display devices with high-resolution and large-screen active matrix drive types face challenges in efficiently detecting short-circuits between adjacent data lines, leading to increased costs and time for inspection due to the need for external comparison circuits and complex voltage switching processes.
Innovation Solution
A source driver with a simple configuration that includes gradation voltage generation units, amplifiers, and a voltage comparison unit to detect short-circuits by comparing voltages between adjacent source lines, reducing the need for external circuits and simplifying the inspection process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external comparison circuits are used to detect short-circuits between adjacent data lines, then detection capability is improved, but device complexity and inspection costs increase
Solution Approach 1:
The patent merges the short-circuit detection function with the existing source driver circuit by integrating a comparison circuit within the driver. The detection function is combined with the voltage generation and amplification circuits, eliminating the need for separate external comparison circuits. This reduces device complexity while maintaining detection capability.
Solution Approach 2:
The source driver is designed to perform multiple functions: normal display operation and short-circuit detection. The comparison circuit within the driver can detect short-circuits between adjacent data lines while the driver continues to supply video signals to the display panel, achieving multi-functionality without requiring separate dedicated detection equipment.
2Measurement precision
If voltage switching is performed on all source lines to detect short-circuits, then detection coverage is improved, but inspection time increases
Solution Approach 1:
The patent implements periodic voltage switching on source lines during blanking periods when no display signal is being transmitted. The comparison circuit periodically switches between different voltage levels (e.g., 0V and a reference voltage) to detect short-circuits, allowing detection to occur during idle time without affecting normal display operation.
Solution Approach 2:
The short-circuit detection is performed continuously during blanking periods without interrupting the normal display function. The source driver maintains continuous operation by switching between display mode and detection mode during the vertical or horizontal blanking intervals, ensuring that useful action (display) continues while detection is performed.
3Measurement precision
If adjacent source lines are driven with opposite polarity voltages, then short-circuit detection sensitivity is improved, but power consumption increases
Solution Approach 1:
The patent applies preliminary anti-action by driving adjacent source lines with opposite polarity voltages during detection periods. This creates a situation where a short-circuit would cause current to flow between adjacent lines, making the defect detectable. The opposite polarity driving is applied only during blanking periods, minimizing the impact on overall power consumption.
Solution Approach 2:
The opposite polarity voltage driving is implemented periodically during blanking periods rather than continuously. This allows the detection-sensitive mode to be activated only when necessary, reducing the overall power consumption impact while maintaining detection sensitivity when the function is active.
Data Source
AI summary
A source driver includes: a first gradation voltage generation unit generating a gradation voltage of a first polarity supplied to a pixel on a first source line; a first amplifier receiving the gradation voltage of the first polarity to an input end, amplifying it, and outputting a voltage from an output end; a second gradation voltage generation unit generating a gradation voltage of a second polarity opposite to the first polarity to be supplied to a pixel on a second source line provided in the vicinity of the first source line; a second amplifier receiving the gradation voltage of the second polarity to an input end, amplifying it, and outputting a voltage from an output end; and a voltage comparison unit comparing a voltage of the input end of the second amplifier with the voltage of the output end of the second amplifier and outputs a comparison result.