Optical Filter for Display Device White Balance Correction
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Solution Overview
Problem
Display devices with diffraction elements face issues with image resolution due to peripheral wavelengths deviating from the specific wavelength, causing color aberration and white balance deviations when the observer's eye moves, as the existing systems fail to effectively compensate for these deviations.
Innovation Solution
Incorporating an optical filter between the imaging light generating device and the exit pupil, which attenuates specific wavelength bands of light, particularly red and blue light, to maintain consistent white balance by adjusting attenuation based on the wavelength's position relative to the peak sensitivity wavelength of the visual cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a diffraction element is used to deflect imaging light toward the observer's eye, then the imaging light can be directed to the observer, but light with peripheral wavelengths deviated from the specific wavelength causes a decrease in image resolution due to color aberration
Solution Approach 1:
An optical filter is introduced as an intermediary component between the imaging light generating device and the observer's eye. This filter selectively transmits or blocks specific wavelength ranges, mediating the interaction between the broadband imaging light and the diffraction element to prevent color aberration while maintaining light deflection efficiency
Solution Approach 2:
The optical filter applies local quality control by selectively treating different wavelength components of the imaging light. Rather than uniformly processing all wavelengths, the filter allows the specific wavelength to pass through while blocking peripheral wavelengths, thereby maintaining high image resolution at the targeted wavelength without compromising overall light deflection
2Adaptability or versatility
If the eye of the observer moves, then the observer can adjust viewing position, but the wavelength band of light incident on the pupil changes causing white balance deviation
Solution Approach 1:
The optical filter serves as a stable intermediary that consistently shapes the spectral composition of light before it reaches the diffraction element and observer's eye. This mediator ensures that regardless of eye movement and resulting changes in incident wavelength bands, the filtered light maintains a consistent spectral profile that preserves white balance
Solution Approach 2:
The optical filter performs preliminary spectral conditioning on the imaging light before it enters the optical system. By pre-filtering the light to maintain the appropriate wavelength composition, the system ensures that even when the observer's eye moves and different wavelength bands would normally incident on the pupil, the white balance remains stable due to the preliminary spectral correction
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 optical filter ensures that the image remains balanced by reducing the impact of peripheral wavelengths, preventing deviations in color balance and maintaining consistent visual sensitivity even when the observer's eye moves, thereby enhancing the display's ability to maintain accurate white balance and image quality.
Implementation Method 1
an optical filter disposed between the imaging light generating device and the exit pupil and configured to attenuate a band of red light on a side of a short wavelength that is shorter than a peak wavelength and included in the imaging light emitted from the imaging light generating device
Implementation Method 2
a first diffraction element configured to diffract the imaging light emitted from the imaging light generating device
Implementation Method 3
a second diffraction element configured to diffract the imaging light diffracted by the first diffraction element to form an exit pupil
Data Source
AI summary
A display device according to the present disclosure includes an imaging light generating device configured to emit imaging light, a first diffraction element configured to diffract the imaging light emitted from the imaging light generating device, a second diffraction element configured to diffract the imaging light diffracted by the first diffraction element to form an exit pupil, and an optical filter disposed between the imaging light generating device and the exit pupil, and configured to attenuate a band on a short wavelength side of a peak wavelength of red light included in the imaging light emitted from the imaging light generating device.