Influence of color temperature on color gamut volume, gamut coverage, and light efficiency in four⁃primary laser display systems

LI Ting; ZHU Liquan; CHEN Yuantong; XU Lixin; GU Chun

doi:10.3969/j.issn.1007-5461.2025.03.011

Chinese Journal of Quantum Electronics, Volume. 42, Issue 3, 391(2025)

Influence of color temperature on color gamut volume, gamut coverage, and light efficiency in four⁃primary laser display systems

LI Ting^1,2,3, ZHU Liquan^1,2,3, CHEN Yuantong^1,2,3, XU Lixin^1,2,3, and GU Chun^1,2,3、*

Author Affiliations

¹State Key Laboratory of Particle Detection and Electronics, University of Science and Technology of China, Hefei 230026, China

²Anhui Key Laboratory of Optoelectronic Science and Technology, School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China

³Advanced Laser Technology Laboratory of Anhui Province, Hefei 230037, China

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Figures & Tables(12)

Fig. 1. When CT = 6500 K, the variation of CGV and GC of the RGGB four-primary color display system with adjustment coefficient $k$

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Fig. 2. The variation of GC of the four-primary laser display system with respect to standard D65 (a) and Rec.2020 (b) with $k$ at nine color temperatures, as well as the correspongding change of CGV with $k$ (c), and the changes of maximum CGV and GC with color temperature (d)

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Fig. 3. (a) Planar color gamut of four-primary color display system with different spectral bandwidth; (b) The change of maximum CGV with CT under different spectral bandwidth; (c) The change of maximum GC_D65 with CT; (d) The change of maximum GC_Rec with CT

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Fig. 4. (a) Simulated variation curve of maximum light efficiency of four-primary color display system with thewavelength of the fourth primary color; (b) Simulated variation curve of light efficiency of the four-primary color display system with determined wavelength (550 nm) with adjustment coefficient $k$

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Fig. 5. (a) Picture of projection display machine; (b) Structure diagram of DLP system with 3 DMD; (c) The 1931 CIE⁃xy chromaticity diagram of the four-primary laser display system

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Fig. 6. (a) The four-primary color gamut volume in CIE-xyY space ; (b) Record table for measurement of color gamut volume of four-primary color system; (c) The four-primary color gamut volume in CIE LAB space obtained by rapid measurement of gamut volume; (d) The four-primary color gamut volume in CIE LAB space obtained by theoretical simulation

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Fig. 7. The variation of the maximum CGV' and GC' obtained experimentally of the four-primary color display system with CT

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Table 1. Center wavelengths and chromaticity coordinates of the primary colors in the four⁃primary laser display system
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Table 1. Center wavelengths and chromaticity coordinates of the primary colors in the four⁃primary laser display system
R1 G1 B1 G2
Center wavelength/nm 660 520 465 550
Chromaticity coordinate (0.7243, 0.2730) (0.0738, 0.8036) (0.1459, 0.0327) (0.2893, 0.6970)

Table 2. Theoretical maximum CGV, GC, and corresponding $k$ values at nine color temperatures

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Table 2. Theoretical maximum CGV, GC, and corresponding $k$ values at nine color temperatures

CT/K	$k$ _CGV	CGV_max	Ratio(CGV_max)/%	$k$ _D65	GC_D65max/%	Ratio(GC_D65max)/%	$k$ _Rec	GC_Recmax/%	Ratio(GC_Recmax)/%
4000	0.30	1887473	81.24	0.39	68.92	83.29	0.42	77.77	82.88
5000	0.27	2039743	87.80	0.40	77.15	93.24	0.40	87.88	93.66
6500	0.25	2133380	91.83	0.41	82.75	100.00	0.36	93.83	100.00
8333	0.23	2228788	95.93	0.40	82.26	99.41	0.32	93.21	99.34
10000	0.23	2263039	97.41	0.39	81.53	98.53	0.30	92.06	98.11
12500	0.22	2291333	98.63	0.38	80.73	97.56	0.32	90.80	96.77
14286	0.21	2303275	99.14	0.38	80.32	97.06	0.31	90.20	96.13
16667	0.21	2313840	99.59	0.39	79.92	96.58	0.31	89.63	95.52
20000	0.21	2323263	100.00	0.38	79.53	96.11	0.31	89.10	94.96

Table 3. Theoretically simulated chromaticity coordinates of primary colors with different spectral bandwidths

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Table 3. Theoretically simulated chromaticity coordinates of primary colors with different spectral bandwidths

FWHM/nm	R1 (660 nm)	G1 (520 nm)	B1 (465 nm)	G2 (550 nm)
1	(0.7300, 0.2700)	(0.0743, 0.8336)	(0.1355, 0.0399)	(0.3016, 0.6923)
5	(0.7298, 0.2701)	(0.0756, 0.8310)	(0.1354, 0.0403)	(0.3020, 0.6918)
10	(0.7295, 0.2705)	(0.0792, 0.8241)	(0.1354, 0.0413)	(0.3031, 0.6904)
20	(0.7279, 0.2721)	(0.0923, 0.8003)	(0.1353, 0.0447)	(0.3073, 0.6849)

Table 4. The fourth primary color wavelengths, chromaticity coordinates, and maximum light efficiency values when reaching the maximum light efficiency at different color temperatures

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Table 4. The fourth primary color wavelengths, chromaticity coordinates, and maximum light efficiency values when reaching the maximum light efficiency at different color temperatures

CT/K	$λ$ ₄/nm	Chromaticity coordinate	Maximum light efficiency/(lm⋅w^-1)
4000	575.1	(0.4795, 0.5195)	483.1631
5000	572.6	(0.4622, 0.5367)	453.5852
6500	569.8	(0.4427, 0.5561)	428.1020
8333	568.9	(0.4434, 0.5554)	398.4368
10000	568.2	(0.4314, 0.5672)	382.6199
12500	567.2	(0.4243, 0.5742)	368.0766
14286	566.7	(0.4208, 0.5777)	360.6774
16667	566.6	(0.4201, 0.5784)	353.2780
20000	566.2	(0.4173, 0.5812)	347.2152

Table 5. The experimentally measured CGV and GC of the RGGB four⁃primary display system at nine color temperatures

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Table 5. The experimentally measured CGV and GC of the RGGB four⁃primary display system at nine color temperatures

CT/K	CGV′	Error rate (CGV)/%	GC_D65′/%	Error rate (GC_D65)/%	GC_Rec′/%	Error rate (GC_Rec)/%
4000	1872816	99.22	69.85	101.35	78.90	101.45
5000	2083651	102.15	75.19	97.46	85.61	97.42
6500	2167961	101.62	80.37	97.12	91.89	97.93
8333	2240891	100.54	79.96	97.20	91.11	97.75
10000	2310670	102.10	79.23	97.18	89.97	97.73
12500	2349949	102.56	77.37	95.84	88.70	97.69
14286	2333981	101.33	76.13	94.78	87.70	97.23
16667	2332462	100.80	74.40	93.09	86.16	96.13
20000	2378219	102.37	73.66	92.62	80.34	90.17

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Ting LI, Liquan ZHU, Yuantong CHEN, Lixin XU, Chun GU. Influence of color temperature on color gamut volume, gamut coverage, and light efficiency in four⁃primary laser display systems[J]. Chinese Journal of Quantum Electronics, 2025, 42(3): 391

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Paper Information

Category:

Received: Oct. 4, 2023

Accepted: --

Published Online: Jun. 11, 2025

The Author Email:

DOI:10.3969/j.issn.1007-5461.2025.03.011

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Center wavelengths and chromaticity coordinates of the primary colors in the four⁃primary laser display system

Table 1. Center wavelengths and chromaticity coordinates of the primary colors in the four⁃primary laser display system

Table 2. Theoretical maximum CGV, GC, and corresponding k values at nine color temperatures

Table 2. Theoretical maximum CGV, GC, and corresponding k values at nine color temperatures

Table 3. Theoretically simulated chromaticity coordinates of primary colors with different spectral bandwidths

Table 3. Theoretically simulated chromaticity coordinates of primary colors with different spectral bandwidths

Table 4. The fourth primary color wavelengths, chromaticity coordinates, and maximum light efficiency values when reaching the maximum light efficiency at different color temperatures

Table 4. The fourth primary color wavelengths, chromaticity coordinates, and maximum light efficiency values when reaching the maximum light efficiency at different color temperatures

Table 5. The experimentally measured CGV and GC of the RGGB four⁃primary display system at nine color temperatures

Table 5. The experimentally measured CGV and GC of the RGGB four⁃primary display system at nine color temperatures

Table 2. Theoretical maximum CGV, GC, and corresponding $k$ values at nine color temperatures

Table 2. Theoretical maximum CGV, GC, and corresponding $k$ values at nine color temperatures