AMOLED Pixel Circuit Detection Using Line Impedance Compensation
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Solution Overview
Problem
Inaccurate detection results are obtained for drive transistors in active matrix organic light emitting diode (AMOLED) display screens due to voltage drops caused by line impedance in detection signal lines, leading to inconsistent driving states of pixel circuits.
Innovation Solution
Adjust the data voltage input to each pixel circuit in a pixel column based on the first and second node voltages, ensuring all pixel circuits have the same preset voltage to compensate for line impedance, thereby maintaining a uniform driving state and obtaining accurate detection data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple pixel circuits in the same column are connected to the detection module through the same detection signal line, then the detection structure is simple, but voltage drops caused by line impedance lead to inaccurate detection results
Solution Approach 1:
The patent applies local quality by measuring voltages at different locations (first node voltage at the farthest pixel circuit, second node voltage at the closest pixel circuit) and using these location-specific measurements to calculate compensation values for each pixel circuit, thereby addressing the voltage drop issue while maintaining the simple detection structure
Solution Approach 2:
The patent implements feedback by using the measured voltage differences to calculate compensation values that are fed back to adjust the detection results. The compensation value is calculated based on the voltage difference between nodes and the number of pixel circuits, then applied to correct the detected data for each pixel circuit
2Ease of operation
If the same data voltage is inputted to all pixel circuits in a column, then the operation is simple, but pixel circuits at different positions have different actual voltages due to line impedance
Solution Approach 1:
The patent applies parameter changes by calculating individual compensation values for each pixel circuit based on its position (first node voltage, second node voltage, and number of pixel circuits), then adjusting the data voltage for each pixel circuit accordingly. This ensures all pixel circuits experience the same actual voltage despite being at different positions in the column
Data Source
AI summary
The application relates to a detection method and a debugging method for a display panel, and a display panel. The method includes: obtaining a first node voltage and a second node voltage corresponding to target color pixel circuits in a target pixel column; adjusting, based on the first node voltage and the second node voltage, a data voltage inputted to each target color pixel circuit in the target pixel column, so that preset voltages of a plurality of target color pixel circuits are the same, where the preset voltage is a difference between the data voltage inputted to the target color pixel circuit and a voltage at a connection node between the target color pixel circuit and a detection signal line; and detecting the plurality of target color pixel circuits in the target pixel column, to obtain detected data of each target color pixel circuit.