Panel Current Measurement Noise Cancellation

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Solution Overview

Problem

In active matrix organic electroluminescence display panels, measuring panel currents is challenging due to noise interference from external and internal sources, which affects measurement precision and causes brightness unevenness among pixels.

Innovation Solution

Simultaneously measuring the flow-in current from the high-voltage side and the flow-out current to the low-voltage side and adding these measurements to determine the panel current, which helps cancel out noise and improve measurement accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If panel current measurement is performed using conventional single-point measurement, then measurement process is simple, but measurement precision deteriorates due to noise interference

Engineering Contradiction:

Improvepanel current measurement precisionVSAvoidmeasurement system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent combines multiple current measurements (flow-in current from high-voltage side and flow-out current to low-voltage side) to determine the panel current. By measuring at multiple points and combining the results, the system achieves higher measurement precision while canceling out noise interference that would affect single-point measurements.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The measurement system uses feedback by comparing and combining measurements from different points in the circuit. The flow-in and flow-out current measurements are processed together to feedback-correct the final panel current value, improving precision through iterative noise cancellation.

Inventive Principle:

Principle #23Feedback

2Measurement precision

If single current measurement point is used, then measurement circuit is simple, but noise interference from power supplies affects measurement accuracy

Engineering Contradiction:

Improvecurrent measurement accuracyVSAvoidnoise interference from power supplies

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful noise interference into a benefit by measuring at multiple points where noise affects measurements differently. By combining the flow-in and flow-out current measurements, the system cancels out common-mode noise from power supplies, transforming the noise problem into a solution for improved measurement accuracy.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent adds another dimension to the measurement by introducing multiple measurement points (high-voltage side and low-voltage side) instead of relying on a single point. This dimensional expansion allows the system to differentiate between signal and noise, improving measurement accuracy through multi-dimensional data analysis.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Data Source

PatentUS8217860B2Method and device for measuring panel current

Publication Date: 2012.07.10 GLOBAL OLED TECHNOLOGY LLC

AI summary

A method of measuring a panel current in an active matrix organic electroluminescence display panel, wherein when a current flowing through a display panel when one or a plurality of pixels are caused to emit light is measured, a flow-in current flowing into the display panel from a side of a high voltage and a flow-out current flowing out from the display panel toward a side of a low voltage are simultaneously measured, and a value of a panel current is determined using both obtained measurement results.