Display-Optimized Eyewear Lenses for External Display Visibility
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Solution Overview
Problem
Conventional sunglasses significantly reduce display light brightness, making it difficult for users to view displays while wearing them, as they darken both display content and ambient light, interfering with the usability of external electronic devices.
Innovation Solution
Eyewear with display-optimized lenses that include a polarizer and a color filter, tailored to match the polarization and color spectrum of a target display, reducing ambient light brightness more than display light, allowing users to view both external and head-mounted displays clearly without interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional sunglasses use filters to reduce ambient light brightness, then sun protection is improved, but display light brightness is also reduced making it difficult to view external displays
Solution Approach 1:
The lens applies different filtering characteristics to different portions of the spectrum: it blocks specific wavelengths corresponding to sunlight while transmitting wavelengths corresponding to display light. This is achieved through a transmission spectrum with selective peaks and troughs, allowing the lens to have sun-protecting properties in certain spectral regions while maintaining display visibility in other regions.
Solution Approach 2:
The lens modifies the transmission characteristics by adjusting the transmission spectrum parameters - specifically designing peaks at display light wavelengths and troughs at sunlight wavelengths. This parameter optimization allows the lens to reduce ambient light brightness while preserving display light brightness, resolving the contradiction between sun protection and display visibility.
2Object-affected harmful factors
If lenses reduce ambient light brightness significantly, then visibility of display content is improved, but color accuracy and brightness of display content may be compromised
Solution Approach 1:
The lens provides different transmission characteristics for different spectral regions: high transmission for display light wavelengths (preserving brightness and color) and low transmission for sunlight wavelengths (reducing ambient interference). This localized spectral quality ensures display content maintains its original brightness and color accuracy while ambient light is significantly reduced.
Solution Approach 2:
The lens converts the harmful effect of ambient light into a beneficial filtering mechanism by designing the transmission spectrum to block specific wavelengths of sunlight while preserving display light wavelengths. This transforms the problem of ambient light interference into a solution where the lens selectively filters only the harmful portions of the spectrum.
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
Enables users to interact with external electronic devices while wearing eyewear by maintaining display content brightness and color accuracy, while effectively reducing ambient light interference, thus enhancing usability and visibility.
Implementation Method 1
The lenses may include a polarizer and a color filter that are designed for a given target display. Lenses that are optimized for a display that emits linearly polarized light may include a linear polarizer. Lenses that are optimized for a display that emits circularly polarized light may include a circular polarizer.
Implementation Method 2
The color filter may have a transmission spectrum curve with peaks corresponding to the primary colors of the target display so that the color and brightness of display light is preserved while the brightness of sunlight is reduced.
Implementation Method 3
The color filter may have a transmission spectrum curve with peaks corresponding to the primary colors of the target display so that the color and brightness of display light is preserved while the brightness of sunlight is reduced.
Implementation Method 4
The circular polarizer may include a quarter wave plate and a linear polarizer.
Implementation Method 5
If desired, the light filter may be an electrochromic filter.
Data Source
AI summary
Eyewear such as a head-mounted device may include display-optimized lenses. The lenses may be optimized for viewing an external display while also providing sun protection for the user's eyes. The external display may form part of a handheld electronic device that serves as a controller for the head-mounted device. The lenses in the head-mounted device may reduce ambient light brightness while maintaining the brightness of the external display so that the user can use the external display while wearing the head-mounted device. The user may, for example, provide touch input to the external display to adjust display content on the head-mounted display. The lenses may include a polarizer and a color filter having a transmission spectrum curve with peaks corresponding to the primary colors of the external display. The lenses may be removable clip-on lenses and the light filter may be an electrochromic filter.