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Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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Color vision with a two-photon infrared RGB display.

Pedro Gil1,2, Juan Tabernero1,2, Silvestre Manzanera1,2

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Researchers developed a two-photon infrared RGB display, enabling color vision using only infrared light. This breakthrough expands the possibilities for advanced display technologies beyond the visible spectrum.

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Area of Science:

  • Vision Science
  • Optics
  • Display Technology

Background:

  • Human vision is typically limited to the 400-700 nm visible light spectrum.
  • Two-photon vision, a nonlinear process, allows perception via simultaneous absorption of two infrared photons.
  • Previous research on two-photon vision focused on monochromatic stimuli, leaving color perception unexplored.

Purpose of the Study:

  • To investigate the potential for color perception using two-photon vision.
  • To develop and demonstrate the first functional prototype of a two-photon infrared RGB display.
  • To explore polychromatic color generation and perception using infrared light.

Main Methods:

  • Development of a functional prototype two-photon infrared RGB display.
  • Stimulation of photoreceptors using infrared light to elicit visual responses.
  • Analysis of color mixing principles in the infrared spectrum.

Main Results:

  • Demonstration of polychromatic color perception achievable solely with infrared light.
  • Confirmation that infrared color mixing follows additive principles, similar to visible light.
  • Achievement of a wide gamut of perceived hues, including white, using the infrared display.

Conclusions:

  • Two-photon vision can support polychromatic color perception, expanding beyond the visible spectrum.
  • The developed infrared RGB display technology offers new possibilities for color control in displays.
  • Findings suggest potential applications in advanced immersive display technologies and other visual systems.