OLED Sensing via Scan Lines to Reduce Capacitance

Solution Overview

Problem

Organic light-emitting display devices face challenges in precisely measuring driving information due to increased capacitance and leakage paths formed through data lines, making it difficult to arrange driver ICs and maintain precise sensing, especially as resolution increases.

Innovation Solution

The implementation of a system where driving information is sensed via scan lines, utilizing a scan driver and sensing controller to apply a sensing voltage and measure driving current through a sensing transistor, thereby avoiding data lines and reducing capacitance and leakage paths.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If driving information is read out via data lines, then sensing can be performed, but capacitance of data lines increases and heat generation increases

Engineering Contradiction:

Improvesensing precisionVSAvoidheat generation

Core Design Contradiction:

Measurement precisionVSLoss of energy

Solution Approach 1:

The patent inverts the conventional approach by reading out driving information through scan lines instead of data lines. The sensing transistor is configured to output sensing signals to scan lines, which are then read out by the scan driver. This inversion avoids the capacitance and heat generation issues associated with using data lines for sensing, while still enabling precise measurement of driving information.

Inventive Principle:

Principle #13The other way round (Inversion)

2Measurement precision

If driving information is read out via data lines, then sensing can be performed, but leakage paths are formed making precise sensing difficult

Engineering Contradiction:

Improvesensing precisionVSAvoidleakage paths

Core Design Contradiction:

Measurement precisionVSObject-generated harmful factors

Solution Approach 1:

The patent inverts the conventional approach by reading out driving information through scan lines instead of data lines. The sensing transistor is configured to output sensing signals to scan lines, which are then read out by the scan driver. This inversion avoids the capacitance and heat generation issues associated with using data lines for sensing, while still enabling precise measurement of driving information.

Inventive Principle:

Principle #13The other way round (Inversion)

3Manufacturing precision

If resolution increases, then display quality improves, but number of driver ICs increases making arrangement difficult

Engineering Contradiction:

Improvedisplay resolutionVSAvoiddriver IC arrangement

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent merges the sensing function into the existing scan driver IC by configuring the scan driver to read out driving information through scan lines. This integration eliminates the need for separate readout circuit units in data driver ICs, reducing the size and complexity of driver ICs while maintaining the ability to sense driving information for compensation even as resolution increases.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS9607551B2Organic light-emitting display device and driving method thereof

Publication Date: 2017.03.28 SAMSUNG DISPLAY CO LTD

AI summary

An organic light-emitting display device is provided. An organic light-emitting display device, comprising: a first transistor including a gate electrode connected to a scan line, a first electrode connected to a data line and a second electrode connected to a first node; a second transistor including a gate electrode connected to the first node, a first electrode connected to a first power supply voltage and a second electrode connected to a second node; a third transistor including a gate electrode connected to a sensing control line, a first electrode connected to the scan line and a second electrode connected to the second node; and an organic light-emitting element including an anode electrode connected to the second node and a cathode electrode connected to a second power supply voltage.