Display Device Data Line Multi-Function Detection Circuit

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Solution Overview

Problem

Existing organic EL display devices face challenges in simultaneously compensating for the deterioration of both drive transistors and organic EL elements without increasing circuit scale, leading to variations in brightness and display quality.

Innovation Solution

An active matrix-type display device with a pixel circuit drive unit that performs characteristic detection processing in a frame period, using data lines for both signal transfer and characteristic detection, and stores correction data to adjust video signals, allowing for simultaneous compensation of drive transistor and organic EL element deterioration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If characteristic detection processing is performed using separate signal lines for both drive transistor and organic EL element, then measurement precision is improved, but device complexity increases

Engineering Contradiction:

Improvecharacteristic detection precisionVSAvoidcircuit scale

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The data line is designed to perform multiple functions: it serves as both a signal transmission line for driving the organic EL element and as a characteristic detection line for measuring both the drive transistor parameters and the organic EL element parameters. This multi-functional design eliminates the need for separate detection lines, thereby maintaining measurement precision while reducing circuit complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent combines the signal transmission function and the characteristic detection function into a single data line. By merging these functions, the circuit structure is simplified without compromising the ability to accurately detect characteristics of both the drive transistor and the organic EL element

Inventive Principle:

Principle #5Merging (Combining)

2Measurement precision

If additional signal lines are added for characteristic detection, then measurement precision is improved, but ease of manufacture deteriorates

Engineering Contradiction:

Improvecharacteristic detection precisionVSAvoidmanufacturing complexity

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

Inventive Principle:

Principle #5Merging (Combining)

3Measurement precision

If separate detection processing is performed for drive transistor and organic EL element, then measurement precision is improved, but loss of time increases

Engineering Contradiction:

Improvecharacteristic detection precisionVSAvoiddetection processing time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The detection processing is organized into periodic phases within the frame period, with specific timing for drive transistor detection and organic EL element detection. This structured periodic approach allows both measurements to be completed systematically without extending the overall frame period

Inventive Principle:

Principle #19Periodic action

4Ease of manufacture

If circuit scale is reduced without additional signal lines, then ease of manufacture is improved, but measurement precision deteriorates

Engineering Contradiction:

Improvecircuit simplicityVSAvoidcharacteristic detection precision

Core Design Contradiction:

Ease of manufactureVSMeasurement precision

Solution Approach 1:

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS9430968B2Display device and drive method for same

Publication Date: 2016.08.30 SHARP KK

AI summary

There is realized a display device capable of compensating for a deterioration of a circuit element while suppressing an increase of a circuit scale. One horizontal scanning period for a monitor row is composed of: a detection preparation period where preparation for detecting TFT characteristics and OLED characteristics is performed in the monitor row; a TFT characteristic detection period where current measurement for detecting the TFT characteristics is performed; an OLED characteristic detection period where current measurement for detecting the OLED characteristics is performed; and a light emission preparation period where preparation for allowing an organic EL element to emit light is performed in the monitor row. Data lines are used not only as signal lines that transfer a signal for allowing an organic EL element in each pixel circuit to emit light at desired brightness, but also as characteristic detecting signal lines.