Foldable Display Partial Driving Image Sticking Compensation

Solution Overview

Problem

Flexible display devices operating in partial driving modes experience image sticking due to degradation deviations between driven and non-driven display regions, leading to luminance differences and perceived image sticking.

Innovation Solution

A display device with a display panel comprising first and second display regions and an intermediate region, where degradation information is stored and used to generate gradation data that smoothly transitions between the regions, preventing luminance differences and image sticking by calculating average or weighted moving averages of gray values for edge and degradation information.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If a flexible display device operates in a partial driving mode to reduce power consumption, then energy efficiency is improved, but image sticking occurs due to degradation deviation between driven and non-driven regions

Engineering Contradiction:

Improvepower consumptionVSAvoidimage quality consistency

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent applies parameter changes by dynamically adjusting the gray level values of pixels in the intermediate display region based on degradation information. When a display region is not driven to save power, the intermediate region between driven and non-driven areas experiences degradation deviation. The system compensates for this by modifying the gray level parameters of intermediate pixels, ensuring smooth transitions and preventing image sticking while maintaining the power-saving partial driving mode.

Inventive Principle:

Principle #35Parameter changes

2Loss of energy

If only the viewed region of the display panel is driven to reduce power consumption, then energy efficiency is improved, but degradation deviation occurs between driven and non-driven regions causing image sticking

Engineering Contradiction:

Improvepower consumptionVSAvoidimage sticking phenomenon

Core Design Contradiction:

Loss of energyVSObject-affected harmful factors

Solution Approach 1:

The patent implements preliminary action by pre-calculating and storing degradation information for edge regions of display areas before partial driving mode activation. The system anticipates the degradation that will occur at boundaries between driven and non-driven regions, and prepares compensation data in advance. This allows the intermediate display region to be properly adjusted when partial driving is activated, preventing image sticking before it occurs.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent uses the intermediate display region as an intermediary between driven and non-driven regions. This intermediate region acts as a buffer zone where gradation data is specifically generated to smooth the transition between areas with different degradation levels. By treating the intermediate region as a mediator, the system resolves the harmful image sticking effect that would otherwise occur at the sharp boundary between active and inactive display areas.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Use of energy by moving object

If the display device drives only the partial region viewed by the user, then power consumption is reduced, but luminance differences occur between driven and non-driven regions

Engineering Contradiction:

Improvepower consumptionVSAvoidluminance uniformity

Core Design Contradiction:

Use of energy by moving objectVSIllumination intensity

Solution Approach 1:

The patent applies parameter changes by dynamically adjusting the gray level values of pixels in the intermediate display region based on degradation information. When a display region is not driven to save power, the intermediate region between driven and non-driven areas experiences degradation deviation. The system compensates for this by modifying the gray level parameters of intermediate pixels, ensuring smooth transitions and preventing image sticking while maintaining the power-saving partial driving mode.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11217136B2Display device supporting a partial driving mode, and method of operating a display device

Publication Date: 2022.01.04 SAMSUNG DISPLAY CO LTD

AI summary

A foldable display device includes a display panel with a first display region, a second display region and a foldable display region located between the first and seconds display regions. A degradation information storage stores first degradation information for a first edge region and second degradation information for a second edge region. An edge information extractor extracts, in a first partial driving mode, first edge information for the first edge region from first partial image data, and extracts, in a second partial driving mode, second edge information for the second edge region from second partial image data. A gradation image generator generates, in the first partial driving mode, first gradation data based on the first edge information and the second degradation information, and generates, in the second partial driving mode, second gradation data based on the first degradation information and the second edge information.