Display Device Driving Method for Flicker Suppression

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Solution Overview

Problem

Active matrix type display devices experience flicker issues when driven at low frequencies due to quenched states during data signal writing, leading to reduced image quality and increased power consumption.

Innovation Solution

A display device driving method that alternates between first and second frequency drives, with a shorter scanning period and quenching period in the second frequency drive, allowing data signal writing during the quenching period and maintaining light emission until the end of the frame period, effectively reducing flicker and power consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by stationary object

If the display device is driven at a low frequency to reduce power consumption, then power consumption is reduced, but flicker occurs due to quenched state during data signal writing

Engineering Contradiction:

Improvepower consumptionVSAvoidflicker

Core Design Contradiction:

Use of energy by stationary objectVSObject-affected harmful factors

Solution Approach 1:

The frame period is segmented into distinct time regions: a first time region for data signal writing (quenching period) and a second time region for light emission. By separating these functions temporally, the patent enables low-frequency driving while preventing flicker, as the light emission phase can be optimized for visibility while the data writing phase occurs when pixels are quenched.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent dynamically adjusts the driving frequency between first frequency drive (higher frequency) and second frequency drive (lower frequency) based on operational conditions. This dynamic frequency switching allows the display to reduce power consumption during low-activity periods while maintaining high visibility during active use, effectively managing the power consumption-flicker trade-off.

Inventive Principle:

Principle #15Dynamics

2Object-affected harmful factors

If the scanning period is shortened in the second frequency drive to reduce flicker, then flicker is suppressed, but the frame period becomes insufficient for complete scanning

Engineering Contradiction:

ImproveflickerVSAvoidframe period

Core Design Contradiction:

Object-affected harmful factorsVSLoss of time

Solution Approach 1:

The patent implements periodic action by alternating between first frequency drive and second frequency drive in a structured manner. During second frequency drive, the scanning period is shortened to suppress flicker, while the frame period is extended to accommodate the reduced scanning frequency. This periodic switching between different driving modes allows the system to achieve flicker suppression while maintaining complete scanning coverage over time.

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS11219102B2Method for driving display device and display device

Publication Date: 2022.01.04 SHARP KK

AI summary

The disclosure provides a display device driving method and a display device. In driving the display device in which any one of a first frequency drive and a second frequency drive can be selected as a specific frequency, for a scanning period at the specific frequency from a start of a quenching period for a first row forming a frame to an end of a quenching period for a last row forming the frame, the scanning period in the second frequency drive is shorter than the scanning period in the first frequency drive.