José A. Díaz, José R. Jiménez, Enrique Hita, and Luis Jiménez del Barco, "Optimizing the constant-channel chromaticity and color gamut of CRT color displays by control of brightness and contrast levels," Appl. Opt. 35, 1711-1718 (1996)
Before a CRT color display is calibrated, the levels of the brightness and contrast controls should be considered. These levels have different effects on the relationship between the chromaticity coordinates of the red–green–blue (RGB) channels and the voltage applied to the gun as well as on the color gamut. Using three different CRT color displays, we measured both these relationships as well as the color gamut for different combinations of brightness and contrast levels. With respect to the luminance range of the white point provided by each display, the results show that the assumption of constant-channel chromaticity of the RGB channels is more valid at medium- to low-brightness levels in combination with high-contrast levels. In addition, this assumption holds at high contrast and medium- to low-brightness levels, the color gamut being optimized at these combinations of levels, with regard to the size of the triangle of primaries—the maximum luminance of the display white point.
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Combinations of Brightness and Contrast Controls Used with the CRT Color Display Sony GDM2038 Defined by the Chromaticity Coordinates, Luminance, and Correlated Color Temperature of the White Point and Chromaticity Coordinates and Luminance of the Background Screen
The background luminance (Y) and chromaticity coordinates corresponding to positions 3, 6, and 7 could not be measured because the level was below what can be measured by a spectroradiometer.
Table 2.
Combinations of Brightness and Contrast Controls Used with the CRT Color Display Samsung CSD5577 Defined by the Chromaticity Coordinates, Luminance, and Correlated Color Temperature of the White Point and the Chromaticity Coordinates and Luminance of the Background Screen
Position
White Point
Background
No.
Contrast
Brightness
x
y
Y(cd/m2)
T(K)
x
y
Y(cd/m2)
1
Minimum
Minimum
0.3146
0.3524
5.63
—
0.4493
0.3789
0.02
2
Minimum
Medium
0.3075
0.3464
10.09
—
0.3879
0.388
0.23
3
Minimum
Maximum
0.303
0.343
15.7
7096
0.3485
0.3749
0.9
4
Medium
Minimum
0.294
0.334
69.49
7487
0.3832
0.371
0.1
5
Medium
Medium
0.2924
0.3297
81.27
7583
0.3639
0.3795
0.48
6
Medium
Maximum
0.291
0.3319
101.5
7706
0.3359
0.3686
1.66
7
Maximum
Minimum
0.2923
0.332
131.4
7669
0.3736
0.3693
0.18
8
Maximum
Medium
0.2924
0.3327
153
7652
0.3557
0.3784
0.73
9
Maximum
Maximum
0.2908
0.3284
170.2
7689
0.3323
0.3668
2.03
Table 3.
Combinations of Brightness and Contrast Controls Used with the CRT Color Display NEC MultySync 3D Defined by the Chromaticity Coordinates, Luminance, and Correlated Color Temperature of the White Point and the Chromaticity Coordinates and Luminance of the Background Screen
The background luminance (Y) and chromaticity coordinates corresponding to position 1 could not be measured because the level was below what can be measured by a spectroradiometer.
Tables (3)
Table 1.
Combinations of Brightness and Contrast Controls Used with the CRT Color Display Sony GDM2038 Defined by the Chromaticity Coordinates, Luminance, and Correlated Color Temperature of the White Point and Chromaticity Coordinates and Luminance of the Background Screen
The background luminance (Y) and chromaticity coordinates corresponding to positions 3, 6, and 7 could not be measured because the level was below what can be measured by a spectroradiometer.
Table 2.
Combinations of Brightness and Contrast Controls Used with the CRT Color Display Samsung CSD5577 Defined by the Chromaticity Coordinates, Luminance, and Correlated Color Temperature of the White Point and the Chromaticity Coordinates and Luminance of the Background Screen
Position
White Point
Background
No.
Contrast
Brightness
x
y
Y(cd/m2)
T(K)
x
y
Y(cd/m2)
1
Minimum
Minimum
0.3146
0.3524
5.63
—
0.4493
0.3789
0.02
2
Minimum
Medium
0.3075
0.3464
10.09
—
0.3879
0.388
0.23
3
Minimum
Maximum
0.303
0.343
15.7
7096
0.3485
0.3749
0.9
4
Medium
Minimum
0.294
0.334
69.49
7487
0.3832
0.371
0.1
5
Medium
Medium
0.2924
0.3297
81.27
7583
0.3639
0.3795
0.48
6
Medium
Maximum
0.291
0.3319
101.5
7706
0.3359
0.3686
1.66
7
Maximum
Minimum
0.2923
0.332
131.4
7669
0.3736
0.3693
0.18
8
Maximum
Medium
0.2924
0.3327
153
7652
0.3557
0.3784
0.73
9
Maximum
Maximum
0.2908
0.3284
170.2
7689
0.3323
0.3668
2.03
Table 3.
Combinations of Brightness and Contrast Controls Used with the CRT Color Display NEC MultySync 3D Defined by the Chromaticity Coordinates, Luminance, and Correlated Color Temperature of the White Point and the Chromaticity Coordinates and Luminance of the Background Screen
The background luminance (Y) and chromaticity coordinates corresponding to position 1 could not be measured because the level was below what can be measured by a spectroradiometer.
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