| The pursuit of full-color display is to display all colors that can be perceived by the human eye as much as possible,which is one of the ultimate goals of display technology.In order to achieve this,multi-primary laser display is the most promising solution at present.Laser has the characteristics of high luminances and high monochromaticity,which can provide extremely high brightness and high saturation colors,and its application in display technology has brought many advantages to display system,such as larger color gamut,higher luminances,longer life and higher efficiency.Therefore,laser display has become a hot topic in the current display industry,with various researches and practical products emerging.There are Barco,Keshi and other companies in the world,as well as Hisense,Changhong,Appotronics,Fullcolor and other companies in China,which are actively promoting the research and development of laser display.Especially in recent years,laser display has ushered in an explosive period.The market of commercial and household products has grown rapidly and is expected to become one of the mainstream display technologies in the market.Laser displays are also considered as a part of the national strategy in "The Outline of the National Medium and Long-term Science and Technology Development Plan" and the National "Fourteenth Five-Year Plan" for Science and Technology Development.In"The Made in China 2025",there is a clear statement that the color gamut of laser display should reach 160%NTSC standard gamut by 2020,and further reach 200%NTSC color gamut by 2025.At present,the most common three-primary systems of laser display have gradually approached the limit of three-primary system,but this result is still a certain distance from the goal in "Made in China 2025".If we want to realize this vision and realize full-color display,the multi-primary laser display is almost the only way.With the support of two national key research and development plans,"Basic Research on Key Technologies of Three-Primary LD Laser Display Machine" and "Research and Application Demonstration of Intelligent Presentation and Advanced Display Technology in Snow Venues",and in combination with the relevant research of the research team,this dissertation explored the basic theories of the multiprimary display system,and designed the corresponding experiments for verification,which filled in the research gap in relevant fields in China.The main research work of this dissertation is as follows:1.For the multi-primary display system,due to the addition of new primaries,the peak luminances ratio of primaries is no longer unique and fixed,and there is no universal solution at present.Starting from the additive color theorem and using parameter inequalities,a complete and general solution is obtained for the calculation of primary peak luminances in N-primary(N>3)display systems,including all possible results,and expressed it in the form of solution spaces,and provided a complete theoretical basis for the light sources selection and parameters setting of multi-primary display systems.the completeness and equivalence of the solution spaces were also proved mathematically in the research.On the basis of theory,the accuracy of the algorithm is verified by using a six-primary laser display system.2.Based on the laws of psychophysics such as Weber-Fechner Law and the property of CIEL*a*b*color space,two nonlinear gamut extension schemes were proposed for the conversion of small gamut images to large gamut devices for display,and experimental comparisons are made with different reference algorithms to verify the advantages of the proposed algorithm.We also further verified the feasibility of the algorithm in multi-primary displays.and its compatibility has been proved in three-primary and multi-primary display systems,filling the theoretical gap of gamut mapping in large gamut laser display systems.The image display of multiprimary laser display system was also realized by using the general solution algorithm mentioned above.3.Based on the difference between the multi-primary displays and the three-primary displays,the gamut theoretical limit of the multi-primary displays was proposed for the first time while using the general solution as proposed above.Using the method,the problem that the theory of three-primary display systems is not applicable in gamut evaluation of multi-primary display systems is solved,and a new gamut volume calculation method applicable to the multi-primary displays is successfully constructed,which brings over 5%increase in color gamut.The method is compatible with the three-primary displays and various color spaces.It provides a theoretical basis for the further color management theory of the future multi-primary displays.4.Based on the achievements in the national key research and development plan,we discussed the color gamut evaluation scheme of the specific application example of the six-primary display system-the spectral separation stereoscopic display.This kind of display systems uses the scheme of narrow band-pass coated glasses to let two different groups of three primaries in the six primaries enter the corresponding human eye to form a parallax image,forming a stereoscopic display.Due to the different wavelengths of the three primaries incident on different eyes,the left and right eyes may see different colors.In this process,the human eye’s color fusion mechanism will fuse the two colors to produce a new color perception different from the colors from both left and right eyes.In this dissertation,the binocular color fusion is realized by using the reflector group,the mechanism of color generation by fusion is explored,and the mixing ratio is 50-50.Based on this conclusion,the actual color gamut of a color separation stereoscopic display prototype is calculated using the final results,which provides the basis for color management and image processing of the color separation stereoscopic display in the future.The innovation of this dissertation is as follows:1.Based on the form of parameter inequalities,a general solution algorithm of primary luminances for multi-primary displays is proposed by using the additive color theorem,and is represented by the solution spaces.All points in the solution space correspond to all possible groups of primary luminances and the completeness and equivalence of the solution spaces were also proved mathematically in the research.This method is the most complete solution form of primary luminances of multi-primary displays so far,and can be extended to N(N>3)primary displays.The shape of the solution space also provides corresponding physical meanings,which is more conducive to understanding,and the algorithm is verified by experiments.2.In order to improve the color perception of large gamut images,based on the laws of psychophysics such as Weber Fechner Law and the properties of CIEL*a*b*color space,two nonlinear gamut extension algorithms were proposed for the transformation of images from small gamut to large gamut,which can be compatible with large gamut display systems,including three-primary and multiprimary laser displays,and has achieved better experimental results compared with existing common algorithms.This algorithm can give a better play to the advantages of large gamut display systems such as three-primary laser displays and multi-primary laser displays.3.Using the general solution algorithm of the primary luminances of the multiprimary displays mentioned above,a new gamut measurement scheme of the multiprimary display system is proposed,which represented all colors that the multiprimary displays could display.The problem that the theory of three primary display system is not applicable in gamut evaluation of multi-primary display system is solved,and the method is compatible with the three-primary display system meanwhile.It provides a new perspective for the gamut analysis of multiprimary color display system.A fast calculation scheme was also provided to obtain the new gamut and the scheme was verified by experiments.4.In order to evaluate the color gamut of the specific application example of the sixprimary display system-the spectral separation stereoscopic display,an experiment is designed to quantitatively measure the binocular color fusion mechanism,and the color gamut of the color separation stereoscopic display is calculated and analyzed using the experimental results,which has very important guiding significance for the color gamut evaluation of the color separation stereoscopic display.It can also provide reference value for color management and image processing of this kind of displays. |
PDF Full Text Request