OLED Display Compensation Line for Parasitic Capacitance

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Solution Overview

Problem

In organic light emitting display devices, parasitic capacitances between auxiliary lines and anode electrodes of organic light emitting diodes can cause erroneous light emission in repaired pixels due to fringe capacitance, leading to suboptimal performance.

Innovation Solution

The implementation of an organic light emitting display device with auxiliary and compensation data lines, synchronized data voltages, and specialized pixel arrangements to compensate for parasitic capacitance-induced voltage changes, ensuring accurate light emission from repaired pixels.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of repair

If auxiliary lines are used to connect auxiliary pixels with anode electrodes of organic light emitting diodes in repaired pixels, then defective pixels can be repaired and made to emit light, but parasitic capacitances and fringe capacitance are formed between the auxiliary line and anode electrodes/scan lines, causing voltage changes and erroneous light emission

Engineering Contradiction:

Improvepixel repair capabilityVSAvoidlight emission accuracy

Core Design Contradiction:

Ease of repairVSReliability

Solution Approach 1:

The patent introduces a compensation line as an intermediary element between the auxiliary line and the anode electrode. This compensation line acts as a mediator to counterbalance the parasitic capacitance effect, preventing voltage changes that would cause erroneous light emission while maintaining the repair functionality

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent applies preliminary anti-action by pre-establishing the compensation line with opposite polarity characteristics before the auxiliary line causes problematic voltage changes. The compensation line is designed to generate compensating charges that counteract the parasitic capacitance effects, preventing erroneous light emission before it occurs

Inventive Principle:

Principle #9Preliminary anti-action

2Productivity

If the auxiliary line is placed close to the anode electrodes for efficient connection, then connection efficiency is improved, but parasitic capacitance increases causing voltage instability

Engineering Contradiction:

Improveconnection efficiencyVSAvoidvoltage stability

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The compensation line serves as an intermediary structure that is positioned between the auxiliary line and anode electrode. It maintains the close proximity needed for efficient connection while introducing compensating electrical characteristics that stabilize the voltage by counterbalancing parasitic capacitance effects

Inventive Principle:

Principle #24Intermediary (Mediator)

3Device complexity

If the auxiliary line runs parallel to scan lines for easy routing, then routing complexity is reduced, but fringe capacitance is formed causing voltage changes

Engineering Contradiction:

Improverouting complexityVSAvoidvoltage control accuracy

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The compensation line is introduced as an intermediary element that runs parallel to the scan lines alongside the auxiliary line. This maintains the simple routing configuration while the compensation line generates compensating effects that eliminate fringe capacitance-induced voltage changes

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent converts the harmful fringe capacitance effect into a beneficial compensation mechanism. By intentionally introducing the compensation line with opposite characteristics, the previously harmful parallel arrangement is transformed into a configuration where the capacitance effects are utilized for compensation rather than causing errors

Inventive Principle:

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

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Prevents erroneous light emission from repaired pixels by compensating for voltage changes caused by parasitic capacitances, thereby enhancing the reliability and performance of the organic light emitting display device.

Implementation Method 1

parasitic capacitances may be formed between the auxiliary line and the anode electrodes of the organic light emitting diodes of the pixels

Methodology Applied

Scientific EffectParasitic capacitance: Capacitance

Implementation Method 2

Each pixel emits light of a brightness determined by an amount of current flowing from a first power voltage of the plurality of power voltages to an organic light emitting diode according to a data voltage

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS9779668B2Organic light emitting display device

Publication Date: 2017.10.03 SAMSUNG DISPLAY CO LTD

AI summary

An organic light emitting display device including data lines, an auxiliary data line, and a compensation data line, a display area including display pixels connected to the data lines, a nondisplay area including auxiliary pixels connected to the auxiliary data line, and compensation pixels connected to the compensation data line, and auxiliary lines connected to the auxiliary pixels and the compensation pixels.