Display Device Privacy Protection via Inverted Image Frames
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Solution Overview
Problem
Existing display devices fail to effectively protect private image content from unintended viewers while maintaining high display quality, as they rely on complex devices or facilities to secure images.
Innovation Solution
A display device and system that uses a display unit with inverse image processing and shutter spectacles to alternate between original and inverted image frames, ensuring only authorized users can view the original image by mixing and processing image data signals to create a secure, overlapping image for non-users.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex devices or facilities are used to secure images, then security of displayed contents is improved, but device complexity increases
Solution Approach 1:
The patent applies inversion by displaying not only the original image but also an inverted image (with inverted luminance values) alternately in sequential frames. This creates a secured image that appears garbled to unintended viewers while the original image can be recovered by users with the proper decoding capability, thus improving security without requiring complex physical protection devices.
Solution Approach 2:
The patent implements periodic action by alternately displaying original and inverted images in sequential frames at a specific frame rate. This periodic switching creates a temporal pattern that, when viewed without proper synchronization, appears as a secured/garbled image, while users with synchronized display devices can perceive the original image content, achieving security through temporal modulation rather than spatial complexity.
2Reliability
If original and inverted images are displayed alternately, then security against unintended viewing is improved, but image quality for non-users deteriorates
Solution Approach 1:
The patent changes the luminance parameter of the image by displaying inverted images (with inverted luminance values) alternately with original images. This parameter modification ensures that unintended viewers perceive a garbled/secured image with poor visual quality, while the original image quality is preserved for authorized users who can properly decode the alternating sequence.
3Manufacturing precision
If dithering is applied to reduce luminance difference at edge interfaces, then image quality is improved, but processing complexity increases
Solution Approach 1:
The patent applies dithering processing in advance to the inverted image data before it is displayed. By pre-processing the inverted image to reduce luminance differences at edge interfaces, the patent improves the overall image quality and reduces artifacts that would be visible to unintended viewers, while the additional processing complexity is performed offline or in advance rather than in real-time during display.
Data Source
AI summary
A display device includes a display unit including a plurality of pixels connected to a plurality of scan lines and a plurality of data lines, an inverse image processor configured to receive a first image data signal input from an external source and to generate a gray-inverted second image data signal, a controller configured to mix the first image data signal and the second image data signal alternately for each frame to generate a third image data signal, and to generate a driving control signal opening and closing a pair of shutter spectacles for each image frame displayed in the display unit, and a data driver configured to receive the third image data signal from the controller and to apply a corresponding data voltage to each of the plurality of data lines.