Display Luminance Control for Glariness Reduction

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Mobile display devices experience visual fatigue due to the glariness phenomenon when suddenly transitioning from a low-luminance or dark environment to a bright screen at night, as they fail to adjust output luminance in accordance with ambient illuminance and content attributes.

Innovation Solution

A display device equipped with a sensing unit to measure ambient illuminance and a processor that gradually increases the output luminance based on sensed conditions and display attributes, using a predetermined mathematical function, lookup table, or previous memory values, to adjust the luminance from a starting value to a targeting value over a set time, considering factors like maximum brightness, color, and luminance differences.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If the display transitions from a sleep state to a bright screen in nighttime or dark environment, then the display becomes visible and usable, but a glariness phenomenon occurs and eye fatigue increases due to sudden luminance change

Engineering Contradiction:

Improvedisplay luminanceVSAvoidglariness phenomenon and eye fatigue

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The system performs preliminary sensing of ambient illuminance before displaying content, and preliminarily adjusts the display luminance based on the sensed ambient light conditions. This preliminary action prevents the sudden luminance change that causes glariness by preparing the appropriate brightness level in advance.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The display luminance is made dynamic rather than fixed, allowing it to adjust gradually based on ambient illuminance conditions and content attributes. The system dynamically modifies the output luminance value over time, transitioning smoothly from sleep state to active display state with adapted brightness levels.

Inventive Principle:

Principle #15Dynamics

2Illumination intensity

If the display output luminance is set high for visibility, then the display is clearly visible, but the glariness phenomenon occurs in low ambient illuminance environments

Engineering Contradiction:

Improvedisplay luminanceVSAvoidglariness phenomenon

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The system changes the luminance parameter based on ambient illuminance conditions and content attributes. Instead of using a fixed high luminance value, the output luminance is adjusted as a variable parameter that adapts to environmental conditions, preventing glariness while maintaining visibility.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The sensing unit provides feedback about ambient illuminance conditions to the processor, which then adjusts the display luminance accordingly. This feedback mechanism ensures the display luminance is appropriately matched to the ambient environment, preventing excessive brightness in dark conditions.

Inventive Principle:

Principle #23Feedback

3Object-affected harmful factors

If the display luminance is adjusted based on ambient illuminance, then the glariness phenomenon is reduced, but the display may not be bright enough for content with high luminance requirements

Engineering Contradiction:

Improveglariness phenomenonVSAvoiddisplay luminance

Core Design Contradiction:

Object-affected harmful factorsVSIllumination intensity

Solution Approach 1:

The system applies different luminance adjustment strategies to different types of content based on their specific attributes. Bright content and dark content receive different luminance treatments, allowing each content type to be displayed optimally without causing glariness, rather than applying a uniform luminance level to all content.

Inventive Principle:

Principle #3Local quality

4Speed

If the display transitions quickly from sleep state to active state, then the response time is short, but the sudden luminance change causes eye fatigue

Engineering Contradiction:

Improvetransition speedVSAvoideye fatigue

Core Design Contradiction:

SpeedVSObject-affected harmful factors

Solution Approach 1:

The display transition is divided into periodic stages rather than occurring instantaneously. The luminance increases in controlled increments over time, allowing the eyes to adapt gradually to the changing brightness levels while still achieving full brightness relatively quickly.

Inventive Principle:

Principle #19Periodic 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

Prevents visual fatigue by gradually adjusting the display's luminance to match ambient conditions, reducing the glariness phenomenon when used in nighttime or dark environments, thereby enhancing user comfort.

Implementation Method 1

a sensing unit configured to sense ambient illuminance

Methodology Applied

Scientific EffectIlluminance sensing: Photoelectric Effect

Data Source

PatentUS11122235B2Display device and control method therefor

Publication Date: 2021.09.14 SAMSUNG ELECTRONICS CO LTD

AI summary

A display device is provided. The display device includes a display configured to display at least one of an image and a text; a sensing unit configured to sense ambient illuminance; and a processor configured to gradually increase an output luminance value of the display, if a specific condition is satisfied based on the ambient illuminance sensed by the sensing unit and display attributes.