Lighting Test Device Voltage Compensation for Display Panel Accuracy
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Solution Overview
Problem
Existing lighting test devices for organic light emitting display devices face challenges in accurately testing the lighting state of red, green, and blue pixels due to connection state variations between test pads and display panel pads, leading to distorted test results and potential misclassification of pixel defects.
Innovation Solution
A lighting test device with a connection part featuring multiple test pads and a test circuit that outputs connection test signals, receives feedback signals, and adjusts voltage levels of test signals based on the connection state, using a variable resistor to compensate for voltage differences and ensure accurate signal application to the display panel pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a lighting test device applies fixed voltage levels to test pads without compensation, then the device structure remains simple, but connection state variations cause distorted test results and false defect identification
Solution Approach 1:
The test circuit receives feedback signals from the display panel through the connection part, measures the actual voltage levels at the test pads, and uses this feedback to dynamically adjust the test signal voltage levels. This closed-loop feedback mechanism compensates for connection state variations and ensures accurate test results regardless of connection quality.
Solution Approach 2:
The test circuit dynamically changes the voltage level parameter of the test signals based on measured connection characteristics. By adjusting the voltage levels of test signals applied to the test pads according to the actual connection state, the system maintains measurement accuracy despite variations in connection quality between the lighting test device and display panel.
2Measurement precision
If the test device uses voltage compensation circuitry to adjust for connection variations, then test result accuracy improves, but the ease of operation and setup becomes more difficult
Solution Approach 1:
The lighting test device performs self-calibration by automatically measuring the connection state through feedback signals and adjusting its own test signal voltage levels without requiring external intervention. The system autonomously compensates for connection variations, eliminating the need for manual calibration procedures and reducing operational complexity.
Solution Approach 2:
The test circuit performs preliminary measurement of the connection state before applying the actual test signals to the display panel. By characterizing the connection characteristics in advance and pre-adjusting the voltage compensation parameters, the system prepares the optimal test conditions beforehand, simplifying the subsequent testing operation.
Data Source
AI summary
A lighting test device for a display panel includes: a connection part including a first connection test pad, a second connection test pad and a plurality of test pads, which are arranged at an end of the connection part, where the connection part is allowed to be connected to the display panel through the first connection test pad, the second connection test pad and the test pads; and a test circuit which outputs a connection test signal to the first connection test pad, receives a feedback signal through the second connection test pad, and adjusts voltage levels of test signals to be applied to the test pads based on the connection test signal and the feedback signal.