Near-Eye Display Light Modulation Units for Eye Strain Reduction
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Solution Overview
Problem
Virtual reality near-eye display devices can cause nausea in users due to the need to focus on dynamic images, leading to discomfort and affected user experience.
Innovation Solution
The near-eye display device incorporates light modulation units, each corresponding to a display pixel, directing display light to the user's eye with a width smaller than the pupil size, allowing clear images to be received regardless of focusing distance and reducing eye tension through precise light projection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the display light width is made larger to cover the full pupil area, then the brightness and visibility of the display are improved, but the user experiences eye strain and nausea when focusing on dynamic images at varying distances
Solution Approach 1:
The patent applies local quality by creating different light distribution characteristics in different regions of the display light. The light modulation unit generates a light distribution pattern where the central region has higher intensity than the peripheral regions, matching the natural pupil's light reception characteristics. This localized intensity variation allows the display to provide sufficient brightness for clear imaging while reducing the overall light energy entering the eye, thereby preventing eye strain and nausea without sacrificing visibility.
2Object-affected harmful factors
If the display light width is reduced to relieve eye tension, then the user comfort is improved, but the brightness and clarity of the displayed images may be compromised
Solution Approach 1:
The patent employs parameter changes by dynamically adjusting the light distribution parameters through the light modulation unit. Specifically, it modifies the intensity distribution pattern within the display light, creating a concentrated central region with higher intensity and peripheral regions with lower intensity. This parameter transformation allows the system to maintain adequate image brightness in the central viewing area while reducing the total light energy that causes eye tension, thus resolving the contradiction between comfort and visibility.
3Reliability
If the display light is directed precisely to match the pupil size, then the parallax between two eyes is reduced, but the alignment precision and manufacturing complexity increase
Solution Approach 1:
The patent applies segmentation by dividing the light modulation function into multiple independent light modulation units, each corresponding to individual display pixels. Each light modulation unit independently controls the light distribution pattern for its associated pixel, with the ability to generate the characteristic central-high intensity pattern. This segmentation allows the system to achieve precise parallax reduction through software-controlled light distribution without requiring extremely tight mechanical alignment tolerances, as each unit operates independently with standardized dimensions.
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 design enhances user experience by preventing nausea and eye strain, as users do not need to focus on specific distances, and reduces parallax issues between eyes, resulting in improved comfort and clarity.
Implementation Method 1
Each of the light modulation units is configured to direct the display light emitted from the corresponding display pixel unit to an eye of a user
Data Source
AI summary
A near-eye display device includes a display panel and a plurality of light modulation units. The display panel includes a plurality of display pixel units configured to emit display light. The light modulation units are disposed on a light emitting surface of the display panel, and each of the light modulation units is disposed corresponding to one of the display pixel units. Each of the light modulation units is configured to direct the display light emitted from the corresponding display pixel unit to an eye of a user, and a width of the display light directed to the eye of the user is smaller than the pupil size of the eye. The user may still receive clear images when the near-eye display is out of focus because the display light directed to the eye has the width smaller than the pupil size.