Optical See-Through Display Shutter for External-Light Color Compensation
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Solution Overview
Problem
Optical see-through display apparatuses suffer from distortion of virtual images due to external light interference.
Innovation Solution
Incorporation of an optical shutter panel with R, G, and B sub-pixels to adjust external light transmittance, combined with an optical sensor and processor for compensation algorithms to match the color of the mixed virtual image with a target image, ensuring minimal color difference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an optical see-through display apparatus displays a mixture of virtual image and real image to the user, then the user can see both virtual and external real images simultaneously, but the virtual image becomes distorted by the external light
Solution Approach 1:
The patent divides the display system into separate functional components: a display panel for the virtual image, an optical shutter panel with R, G, and B sub-pixels for controlling external light, and an optical sensor for measuring external light color. This segmentation allows independent optimization of each component to resolve the contradiction between see-through functionality and image quality.
Solution Approach 2:
The optical shutter panel dynamically adjusts its transmittance for different colors (R, G, B) based on real-time measurements of external light conditions. The processor generates dynamic shutter data that changes the optical properties of the shutter panel to compensate for external light distortion, maintaining virtual image quality while preserving see-through capability.
2Manufacturing precision
If an optical shutter panel is added to adjust external light transmittance, then virtual image distortion can be compensated, but the device complexity increases
Solution Approach 1:
The optical shutter panel serves multiple functions: it acts as a color filter to measure external light color through its R, G, and B sub-pixels, and simultaneously functions as a transmittance controller to adjust the amount of external light reaching the user. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity.
Solution Approach 2:
The optical shutter panel acts as an intermediary between the external light source and the user's eye. It mediates the interaction by selectively filtering and attenuating external light based on color and intensity, enabling compensation of virtual image distortion without requiring direct modification of the virtual image generation process.
3Measurement precision
If compensation algorithms are used to adjust shutter data, then color accuracy of the mixed virtual image can be improved, but the processing time and computational complexity increase
Solution Approach 1:
The system performs preliminary measurements of external light color using the optical sensor and shutter panel before generating the compensation algorithm. By pre-measuring the external light characteristics, the processor can quickly generate appropriate shutter data without requiring complex real-time calculations during image display, thereby reducing processing time while maintaining color accuracy.
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 solution effectively compensates for virtual image distortion caused by external light, providing a clear and undistorted mixed virtual and real image experience.
Implementation Method 1
an optical shutter panel disposed on an outer surface of the display panel, and including R, G, and B sub-pixels to adjust a transmittance of an external light for each of R, G, and B colors
Implementation Method 2
an optical sensor that measures a color of the external light
Data Source
AI summary
An optical see-through display apparatus includes an image output module, a display panel, an optical shutter panel to adjust a transmittance of an external light for each of R, G, and B colors. The display apparatus includes an optical sensor to measure a color of the external light. The display apparatus includes a processor that generates R, G, and B shutter data through a first compensation algorithm. The first compensation algorithm is operated to: compare a color of a mixed virtual image with a color of a target mixed virtual image, and when a color difference therebetween is a threshold value or less, designate a transmittance of the optical shutter panel as a candidate transmittance, and select a candidate transmittance implementing the mixed virtual image most similar to the target mixed virtual image, and generate the R, G, and B shutter data corresponding to the selected candidate transmittance.