The human eye is more capable of color discrimination in a wide color gamut display. W. A. Thornton hypothesized that they may also enhance color discrimination for color-deficient observers. Compared with normal color vision observers (NCO), anomalous trichromats (AT) have color loss due to difference in cone sensitivity. The large color gamut display system provides a promising solution for solving this problem. We propose a new geometric method to compute the color stereo of AT based on different display color gamuts. The proposed method is fast and efficient to improve color perception for different types of AT.
KEYWORDS: Color and brightness control algorithms, Color management, 3D displays, Glasses, Displays, Stereoscopic displays, 3D vision, Light sources, Laser based displays, 3D image processing
Three-dimensional (3D) display is a very attractive research direction, and have potential in many areas. The cutting-edge autostereoscopic display technology allows glasses-free experience, but still be limited in the lab because of the small eye space and high cross-talk. The only commercially available technology is still polarization-interlaced stereoscopic display. The disadvantages are the bulk-cost of the polarization module, low-light efficiency, and the high crosstalk. Besides, the color gamut in two-dimensional (2D) display is very important to display systems, which represents the color rending ability, and at present limited by three primaries. Herein, we demonstrate a six-primary-laser projection system compatible with 3D and 2D display, achieve great 3D viewing experience with crosstalk lower than 1% by time-multiplexed stereoscopic display technology and spectral coating glasses. In addition, we study the volume color gamut of this system in 2D working mode. The color gamut is greatly increase to an amazing 178.4% NTSC, owing to the application of multiprimary color and narrow spectral line-width laser source. This system is also provide the possibility for us to study the color gamut involving binocular fusion in 3D working mode in future.
Color gamut is an important parameter for display system. Wider gamut means that the system can display more colors. In this article, we designed an experiment to measure the color discrimination ability of human eyes in a certain range under different light sources such as LCD, LED, OLED and laser display, which has different center wavelength and spectrum-width. In our experiment, a Xenon lamp projector and a RGB laser projector were used to run the testing program. Eight volunteers` results showed that the gamut of RGB laser display is 49.48% larger than that of ordinary Xenon lamp display, and the standard deviation of the result was 8.7%.
Many kinds of display technology such as LCD, OLED, quantum dot and laser display are developing rapidly. The final purpose of display technology is to achieve wider color gamut. Traditional method uses planar chromaticity diagram in CIEXYZ space to describe color gamut. This method did not use uniform color space and cannot deal with the situation of display systems with four or more primaries. In our previous work, we have already established a theory based on Macadam’s theory to calculate the stereoscopic color gamut for RGB laser display systems. In this letter, we extend this theory to display systems with four or more primaries. By using our algorithm, we calculate the stereoscopic color gamut of multi-primary display system. We set a four primary display system as an example. The center wavelength of the primary are set as 467nm, 520nm, 532nm and 630nm, white point is set as D65(x=0.3127, y=0.3290), and color gamut has been calculated in CIELAB color space. Results show that when the ratio of the intensity of four primary is 1.0000:0.7490: 0.4316:1.5000, the largest gamut is obtained, whose value is 2.1030*106. These results can be used in engineering to optimize the intensity of the primaries in four primaries display systems.
Laser display technology has developed rapidly in the past decade because it has advantages of high color saturation, high conversion efficiency, long life span and the capability to show real objects accurately. Many new laser technologies such as ALPD (Advanced Laser Phosphor Display) solution, Two Primary and three Primary Laser Display solutions have been studied for handling wide-gamut standard of Rec.2020 to reproduce the natural object colors faithfully. Different kinds of laser source including LD (laser diodes), diode-pumped solid-state laser, LD pumped Phosphor, VCSEL (Vertical-cavity surface-emitting laser) and fiber laser have been utilized in these solution. They have different center wavelengths and different linewidths which influence the color gamut and the speckle contrast of different display systems. In this paper, we calculate the color solid volume of laser display systems, and systematically investigate the color gamut conditions among display systems with different spectral linewidth selecting and different combination of three primaries. The color gamut of Rec.2020 is set as an object of comparison, in which the center wavelength of three primaries is set as Red=630nm, Green=532nm and Blue=467nm with spectral line width=1 nm. White balanced point is set as D65(x=0.3127, y=0.3291) and curve of color gamut as a function of spectral linewidth is calculated in CIELAB space. Our results would give researchers working on laser display a reference to choose suitable laser source with center wavelength and linewidth to keep a balance between laser speckle and color saturation.
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