AR Display Black Edge Visibility via Local Luminance Adjustment
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Solution Overview
Problem
Existing display devices struggle to effectively represent black images without deteriorating image quality due to discontinuities in signal levels, particularly when displaying black images on head-mounted displays (HMDs) where black images appear transparent or difficult to recognize.
Innovation Solution
The implementation of a display device with a control unit that performs reversing processing and luminance increasing processing on black display edges and background images, allowing for effective black representation by adjusting pixel values and superimposing background images in a way that enhances visibility without degrading image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If black images are displayed as virtual images with pixel values close to black (zero or near-zero), then the image data maintains accurate black representation, but the images become transparent and difficult to recognize
Solution Approach 1:
The patent applies different processing to different regions of the image: black regions (pixel values below threshold) are converted to opaque representations, while non-black regions maintain their original transparent properties. This local differentiation allows black areas to be visible without affecting the overall transparency quality of the AR display.
Solution Approach 2:
The patent converts black pixel values (which would be transparent) into opaque representations by adjusting pixel values above the black threshold. This color/opacity transformation enables black images to be displayed as visible opaque elements rather than transparent ones, solving the visibility problem while preserving black accuracy through threshold-based conversion.
2Object-generated harmful factors
If offset signals are added to pixel signals to display gray gradation and prevent transparent pixels, then black images become visible, but image quality deteriorates due to signal level discontinuity
Solution Approach 1:
The patent changes the pixel value parameter systematically by adding different offset amounts based on the original pixel value. Pixels below the black threshold receive an offset that converts them to opaque gray gradations, while pixels above the threshold receive no offset. This parameter change approach maintains signal level continuity and prevents the discontinuity problems associated with fixed offset methods.
Solution Approach 2:
The patent applies offset addition locally only to pixels that fall below the black threshold, rather than uniformly to all pixels. This localized processing preserves image quality in non-black regions while ensuring black regions become visible through opaque representation, avoiding global signal discontinuity.
Data Source
AI summary
A display device of the present disclosure includes an image display device and a control unit, in which the image display device includes an image formation device, and an optical device that displays an image emitted from the image formation device in front of an observer while superimposing the image on a real image of an outside world, the control unit controls an operation of the image formation device, and in a case where a black display edge that is an edge of an area where black is displayed exists in the image, the control unit performs reversing processing and luminance increasing processing of the black display edge.