AMOLED Panel Test Circuit Reducing Line Impedance
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Solution Overview
Problem
Current AMOLED panel test circuits face inefficiencies due to separate testing units and high line impedance, making it difficult to test AMOLED display panels efficiently and accurately, especially with increasing PPI and AC signal requirements.
Innovation Solution
An integrated AMOLED panel test circuit design that connects data line output units, first test units, and second test units through transistors, allowing for controlled switching to test data lines and display panels efficiently, reducing line impedance and improving detection rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the panel display test circuit passes around the end of the display panel to test data lines, then the test coverage is improved, but the line impedance becomes very large causing driving failure
Solution Approach 1:
The patent divides the test circuit into separate first and second test units, each responsible for testing different portions of data lines. The first test unit tests data lines in a first direction while the second test unit tests data lines in a second direction, segmenting the testing function to reduce the length of test signal transmission paths and thereby reducing line impedance.
Solution Approach 2:
The patent introduces a directional dimension to the testing approach by implementing bidirectional testing. Data lines are tested in both first and second directions using different test units, transforming a unidirectional linear testing approach into a bidirectional approach that shortens the effective test path length and reduces impedance.
2Measurement precision
If separate array substrate test circuit and panel display test circuit are used, then the testing process is more comprehensive, but the testing efficiency decreases
Solution Approach 1:
The patent merges the functions of the array substrate test circuit and panel display test circuit into a single integrated test circuit. This unified test circuit incorporates both first and second test units that can perform comprehensive testing of data lines and display panels, eliminating the need for separate testing equipment and improving testing efficiency.
Solution Approach 2:
The integrated test circuit is designed with multi-functionality, capable of performing both array substrate testing and panel display testing through its first and second test units. The circuit can test data lines in multiple directions and evaluate display panel performance, providing universal testing capability that replaces multiple specialized circuits.
3Manufacturing precision
If the panel display test circuit tests AC signals with increasing PPI, then the display quality is improved, but the circuit load increases beyond driving capability
Solution Approach 1:
The patent segments the testing of high-resolution AC signals into multiple directional test passes. Instead of attempting to drive all high-PPI data lines simultaneously with full AC signals, the test circuit performs sequential testing in different directions, reducing the instantaneous load on the circuit while maintaining comprehensive test coverage.
Data Source
AI summary
The invention relates to the field of electronic circuit design technology, more particularly, to an AMOLED panel test circuit, by integrating the second test unit, the first test unit and the data line output unit together, and respectively achieves the test of the first test unit and the second test unit of the panel through switching on and off the transistor, avoids the problem that one of the test circuit needs to pass around the end of the panel because the test circuit is not integrated in prior art, which causes big line impedance, and increases the detection rate, and saves the cost.