3D Display Luminance Control for Crosstalk and Resolution

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Solution Overview

Problem

Conventional three-dimensional display systems face challenges in reducing crosstalk between images displayed for the left and right eyes, especially in varying environmental illuminance conditions, which affects the visibility and resolution of three-dimensional images.

Innovation Solution

A three-dimensional display system that includes a detection apparatus for determining eye positions, a measuring apparatus for assessing environmental illuminance, and a controller that adjusts the luminance of subpixels on a display panel with a parallax barrier to minimize crosstalk by optimizing the visibility of images based on the user's eye positions and ambient light levels.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If the luminance of all subpixels is uniformly increased to improve image visibility, then the visibility of three-dimensional images is improved, but crosstalk between left and right eye images increases

Engineering Contradiction:
Improveimage visibilityVSAvoidcrosstalk
Core Design Contradiction:
Illumination intensityVSObject-generated harmful factors

Solution Approach 1:

The patent applies local quality by differentiating the luminance control strategy for different subpixel groups. Specifically, the first subpixel group (corresponding to the first eye image) is driven at a higher luminance level than the second subpixel group (corresponding to the second eye image). This localized differentiation allows the first eye image to maintain high visibility while reducing the luminance contribution of the second eye image, thereby minimizing crosstalk interference without compromising overall image quality.

Inventive Principle:
Principle #3Local quality

Solution Approach 2:

The patent implements parameter changes by dynamically adjusting the drive signal parameters for different subpixel groups based on environmental illuminance conditions. The controller modifies the luminance parameter independently for the first and second subpixel groups, allowing adaptive optimization where the luminance ratio between groups changes according to ambient light levels, thus resolving the contradiction between visibility and crosstalk under varying conditions.

Inventive Principle:
Principle #35Parameter changes

2Object-generated harmful factors

If the luminance of subpixels is reduced to minimize crosstalk, then crosstalk between images is reduced, but image resolution and visibility deteriorate

Engineering Contradiction:
ImprovecrosstalkVSAvoidimage resolution
Core Design Contradiction:
Object-generated harmful factorsVSManufacturing precision

Solution Approach 1:

The patent applies local quality by maintaining high luminance for the first subpixel group while reducing luminance for the second subpixel group. This selective approach ensures that the primary image (first eye image) maintains its resolution and visibility, while only the secondary image (second eye image) luminance is reduced to minimize crosstalk. The local differentiation preserves image quality where needed while suppressing interference elsewhere.

Inventive Principle:
Principle #3Local quality

Solution Approach 2:

The patent implements partial action by applying luminance reduction only to the extent necessary for the second subpixel group, rather than uniformly reducing all subpixel luminance. The controller adjusts the drive signals to achieve just enough luminance differential to suppress crosstalk while maintaining adequate brightness and resolution for the primary display content, avoiding excessive dimming that would degrade overall image quality.

Inventive Principle:
Principle #16Partial or excessive action

3Device complexity

If uniform drive signals are used for all subpixels, then the device complexity is reduced, but the ability to adapt to varying environmental illuminance conditions is lost

Engineering Contradiction:
Improvecontrol simplicityVSAvoidenvironmental adaptation
Core Design Contradiction:
Device complexityVSAdaptability or versatility

Solution Approach 1:

The patent applies segmentation by dividing the subpixels into distinct groups (first subpixel group and second subpixel group) with independent drive signal control. This segmentation enables the controller to apply different luminance levels to different groups based on environmental conditions, achieving adaptability without requiring complex per-pixel control. The segmented approach balances simplicity and versatility by creating manageable control zones rather than individual pixel control.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent implements dynamics by making the drive signal parameters adaptive rather than static. The controller dynamically adjusts the luminance levels of different subpixel groups based on detected environmental illuminance, transitioning between different operating modes (e.g., high luminance for both groups in bright environments, differential luminance in dim environments). This dynamic adaptation maintains device simplicity while achieving environmental versatility.

Inventive Principle:
Principle #15Dynamics

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

The system effectively reduces crosstalk and maintains image resolution by dynamically adjusting subpixel luminance according to environmental illuminance, enhancing the visibility of three-dimensional images without the need for glasses.

Implementation Method 1

a first visible region 51aL of the display surface 51 for emitting light which is to reach a first eye position of a user, and a second visible region 51aR of the display surface 51 for emitting light which is to reach a second eye position of a user

Methodology Applied
Scientific EffectLight: Light

Data Source

PatentEP3650922B1Three-dimensional display device, three-dimensional display system, mobile body, and three-dimensional display method
Publication Date: 2023.11.22 KYOCERA CORP
  • EP3650922B1 patent drawingFigure 1
  • EP3650922B1 patent drawingFigure 2
  • EP3650922B1 patent drawingFigure 3

AI summary

A three-dimensional display apparatus includes a display surface, an optical element, and a controller. The display surface includes a plurality of subpixels arranged in a grid pattern along a first direction corresponding to a direction in which user's eyes are aligned and a second direction orthogonal to the first direction. The optical element defines a beam direction of light emitted by the display surface for each of a plurality of strip-shaped regions that extends in a direction on the display surface at a predetermined angle other than 0 degrees with respect to the second direction. The controller is configured to cause the display surface to display an image. The controller is configured to acquire brightness information and, based on the brightness information, reduce the luminance of at least a subset of binocular subpixels that have a portion included in a first visible region on the display surface for emitting light to a first eye position of a user and the remaining portion included in a second visible region on the display surface for emitting light to a second eye position of the user.