OLED Anode Voltage Reset Delay for Motion Blur Reduction

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Solution Overview

Problem

In OLED displays, particularly at low luminance, immediate anode voltage reset at the beginning of a frame can cause noticeable optical artifacts such as motion blur due to slow light emission, which affects response times.

Innovation Solution

Delaying the anode voltage reset to a later interval within the frame period, allowing the organic light-emitting diode to start light emission immediately after new image data is programmed, thereby optimizing light emission and reducing motion blur.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If anode voltage reset is performed immediately at the beginning of a frame, then the circuit is completed quickly and voltage is restored to reset voltage, but light emission is slowed causing motion blur and optical artifacts

Engineering Contradiction:

Improveresponse timeVSAvoidmotion blur

Core Design Contradiction:

SpeedVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary action by performing the anode voltage reset before the data voltage is applied to the organic light-emitting diode. The reset operation is completed in advance during the data programming phase, allowing the anode voltage to be at the correct level when the data voltage is applied, thereby eliminating motion blur while maintaining quick response time.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements dynamics by making the reset timing adaptive rather than fixed. The reset operation is dynamically adjusted based on the frame timing and data programming sequence, allowing the reset to occur at the optimal moment before data application but after the emission period has begun, thus optimizing both response time and eliminating motion blur.

Inventive Principle:

Principle #15Dynamics

2Object-affected harmful factors

If anode voltage reset is delayed to hasten light emission, then response time is improved and motion blur is reduced, but the reset must be performed at a later interval within the frame period

Engineering Contradiction:

Improvemotion blurVSAvoidframe period timing

Core Design Contradiction:

Object-affected harmful factorsVSLoss of time

Solution Approach 1:

The reset operation is performed as a preliminary action during the data programming phase, specifically in the first time interval before the data voltage is applied. This timing ensures that the anode voltage is ready when needed, eliminating motion blur while fitting within the frame period without requiring extension.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent segments the frame period into distinct time intervals: a first time interval for reset and data programming, and a second time interval for light emission. By segmenting the timing sequence this way, the reset can be delayed to the optimal moment without interfering with the emission period, thus eliminating motion blur while maintaining proper frame timing.

Inventive Principle:

Principle #1Segmentation

3Productivity

If reset voltage is applied immediately, then the transistor completes the circuit quickly, but light emission is delayed causing optical artifacts at low luminance

Engineering Contradiction:

Improveframe refresh rateVSAvoidoptical artifacts

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The anode voltage reset is performed as a preliminary action during the data programming phase, allowing the circuit to be prepared in advance. This ensures that when the data voltage is applied, the anode is already at the correct voltage level, enabling immediate light emission without optical artifacts while maintaining high frame refresh rates.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent ensures continuity of useful action by maintaining the anode voltage at the reset level during the data programming phase, then transitioning smoothly to the emission phase without interruption. This continuous voltage management eliminates the delay between reset and light emission, preventing optical artifacts while preserving productivity.

Inventive Principle:

Principle #20Continuity of useful action

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

This approach hastens response times in OLED displays by ensuring immediate light emission, reducing noticeable optical artifacts like motion blur and maintaining low black luminance.

Implementation Method 1

the transistor completes the circuit causing the anode voltage to reset to the reset voltage

Methodology Applied

Scientific EffectElectrical Conduction: Conduction (electrical)

Implementation Method 2

light emission of an organic light-emitting diode

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentUS11488533B2Delaying anode voltage reset for quicker response times in OLED displays

Publication Date: 2022.11.01 GOOGLE LLC

AI summary

This document describes systems and techniques for delaying anode voltage reset for quicker response times in organic light-emitting diode (OLED) displays. In an aspect, a pixel circuit includes a transistor electrically connected to an anode of an organic light-emitting diode and a reset voltage. Upon receiving an anode reset signal, the transistor completes the circuit causing the anode voltage to reset to the reset voltage in an anode voltage reset process. Delaying anode voltage reset can hasten response times in OLED displays.