JPH1184122A - Color filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain stable color reproducibility even under indoor or outdoor illumination by converting three stimulus values of a filter having an absorbance peak wavelength in a specified wavelength range, and three stimulus values obtained by substituting the three stimulus values into a specified transformation formula to a specified color coordinate system, and controlling the obtained color difference to a specified value or smaller. SOLUTION: Three stimulus values X, Y, Z of a filter having the absorbance peak wavelength in 450 to 470 nm range measure under the standard D65 light source, and three stimulus values X', Y', Z' for the corresponding colors under standard A light source obtained by substituting the values X, Y, Z into transformation formulae R=0.4002X+0.70760Y-0.08081Z, G=-0.22630X+1.16532Y+0.04570Z, and B=0.91822Z are tronsformed CIE 1976*a*b color coordinate system to the transformation formula I. Then,the color difference ΔEab* determined by ΔEab* = (L*'-L*)<2> +(a*'-a*)<2> +(b*-b*)<2> }<1/2> is controlled to be <=10. Thereby, influences of external light with different spectral distribution are decreased and stable color reproducibility can be obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color filter for a reflection type color display device which performs display using external light in a display device using a liquid crystal element.

[0002]

2. Description of the Related Art There are two types of liquid crystal displays, transmission type and reflection type.
There are various types, the transmission type is to transmit light from the back to the front of the liquid crystal panel to obtain a display, and the reflection type is to reflect light incident from the front on the reflection surface on the back and return to the front again to obtain display. Things.

[0003] Practical use of liquid crystal displays began with reflection-type displays, but in recent years color displays have been developed, and a backlight is provided on the rear surface of the liquid crystal panel, and light from the backlight is passed through a color filter in the liquid crystal panel. Let through
Transmissive color display devices that easily perform high-quality color display have become mainstream.

[0004] However, since the above-mentioned transmission type color liquid crystal display device has a backlight, it has an undesirably portable surface such as an increase in power consumption, an increase in depth thickness, and an increase in weight.

On the other hand, a reflection type color liquid crystal display device does not require a backlight, and therefore works advantageously against these problems. Therefore, it is promising as a portable color display device. The development of reflective color display devices has been actively pursued.

Colorization of a reflective display device has been under development from two viewpoints. One is to use a color filter, and the other is to use a STN without using a color filter. And the method of utilizing the birefringence and interference of However, in consideration of high-quality color display with wide color reproducibility, a color filter is indispensable for a reflective color display device.

A color filter for a reflection type color display device as described above is manufactured through the same steps as a transmission type color filter, and the manufacturing method is generally a pigment dispersion method, a dyeing method, a printing method, an electrodeposition method, or the like. And the like.

[0008]

In the case of a transmissive color display device, color reproducibility is mainly determined by a backlight, a color filter and the like which constitute the device. That is, display is performed by a backlight having a constant spectral distribution under any environment, and a color image with almost the same color reproducibility can be obtained.

However, in the case of a reflection type color display device, since a color image is displayed by using external light, it is necessary to display the image with external light having different spectral distributions under various illuminations such as outdoors and indoors. , And different color images may be displayed indoors and outdoors.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to reduce the influence of external light having different spectral distributions and to achieve stable color reproducibility under both outdoor and indoor illumination. And a color filter having the same.

[0011]

SUMMARY OF THE INVENTION The present invention relates to a color filter for use in a reflection type color display device, which comprises a standard D65.
Object color with light source, standard A light source, fluorescent lamp normal type F6
By defining the color difference ΔEab ^* between the light source and the corresponding color of the fluorescent lamp three-wavelength light emitting type F10 light source, it is possible to provide a filter having stable color reproducibility that is not different between outdoors and indoors. .

That is, the present invention described in claims 1 to 12 respectively has 450 to 470 nm and 600 to 620 nm.
m, or a standard D65 light source (hereinafter, “D65 light source”) of a filter having an absorbance peak wavelength at 535 to 555 nm.
Below), the tristimulus values X, Y, Z under the X, Y,
Under a standard A light source (hereinafter referred to as “A light source”) obtained by substituting Z into the following conversion formulas (1) to (3), under a fluorescent lamp ordinary F6 light source (hereinafter referred to as “F6 light source”), or The tristimulus values X ', Y', and Z 'of the corresponding color under a fluorescent lamp three-wavelength range light emitting type F10 light source (hereinafter, referred to as "F10 light source") are converted to CIE 1976 L ^* a ^* by the following conversion formula (4) ^. b ^*
The color filter is a color filter in which the color difference ΔEab ^* determined by the following equation (5) is converted into a color system and defined as any of the following.

Color difference between object color with 450-470 nm D65 light source and corresponding color of A light source: 10
Hereinafter, the color difference between the object color in the D65 light source and the corresponding color in the F6 light source: 1
0 or less Color difference between object color with D65 light source and corresponding color with F10 light source:
7 or less Total of the above: 25 or less 600-630 nm Color difference between object color with D65 light source and corresponding color of A light source: 17
Hereinafter, the color difference between the object color in the D65 light source and the corresponding color in the F6 light source: 1
Color difference between object color with D65 light source and corresponding color with F10 light source: 4 or less:
5 or less Total of the above: 35 or less 535-555 nm Color difference between object color with D65 light source and corresponding color of A light source: 28
Hereinafter, the color difference between the object color in the D65 light source and the corresponding color in the F6 light source: 1
0 or less Color difference between object color with D65 light source and corresponding color with F10 light source:
10 or less Total of the above: 45 or less

Conversion formula (1) R = 0.40024X + 0.70760Y-0.080
81Z G = -0.22630X + 1.16532Y + 0.04
570Z B = 0.91822Z

Conversion equation (2) R ′ = 21.00000745 ｛(R + 1) / (20ξ +
1) { ^Pr- 1 G '= 21.00000353} (G + 1) / (20η +
1) { ^Pg -1B '= 20.998922} (B + 1) / (20} +
1)｝ ^Pb -1 However, in the conversion formula of the standard A light source, ξ = 1.185719Pr = 1.0183376 η = 0.9329552Pg = 0.9886407 ζ = 0.26868087 Pb = 0.822219 However, conversion of the F6 light source In the equation, ξ = 1.0485305Pr = 1.0777564 η = 0.9725597Pg = 0.9954452 ζ = 0.5532500Pb = 0.825193. However, in the conversion equation of the F10 light source, ２６ = 1.0268076Pr = 1.0043297. η = 0.9848440 Pg = 0.9974998 ζ = 0.7559704 Pb = 0.9441494

Conversion formula (3) X '= 1.59895R'-1.12939G' + 0.
21990B'Y '= 0.36119R' + 0.63881G'Z '= 1.90806B'

Conversion equation (4) L ^* = 116 (Y / 100) ^1/3 −16 a ^* = 500 ｛(X / 95.04) ^1/3 − (Y / 10
0) ^1/3 ｝ b ^* = 200 ｛(Y / 100) ¹ /3-(Z / 108.8
9) ^1/3 L ^* '= 116 (Y' / 100) ^1/3 -16 a ^* '= 500 (X' / 95.04) ¹ /3-(Y '/ 1
00) ^1/3 ｝ b ^* '= 200 ｛(Y ′ / 100) ^1/3 − (Z ′ / 10
8.89) ^1/3

Equation (5) ΔEab ^* = ｛(L ^* ′ − L ^* ) ² + (a ^* ′ − a ^* ) ² +
(B ^* '-b ^* ) ² ｝ ^1/2

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION A reflection type color display device used as a portable terminal is used under any environment (illumination) indoors and outdoors. When outdoors, sunlight is used as incident light, and when indoors, incandescent bulbs or fluorescent lamps are used as incident light to perform color display. Depending on the spectral distribution of the light source used as the incident light, the chromaticity of the color display is shifted, and the color reproduction may be unstable. Therefore, it is preferable to use a color filter made of a coloring material having a spectral spectrum that is less affected by the spectral distribution of the incident light.

In general, even if the spectral distribution of incident light fluctuates,
Visual functions can capture information without being significantly affected. This is due to eye adaptation, because there is chromatic adaptation that adapts to the color of the field of view. The fact that the appearance of color does not change so much is called color constancy where it is often experienced on a daily basis. As an adaptation order, first, an illumination light shift due to the illumination light occurs. In the illumination light transition, when the illumination light changes, the eyes cannot respond immediately to the change, so that the user feels a color corresponding to the change in the illumination light. Next, when the eyes become accustomed to the changed illumination light, the sensitivity balance of the cones of the eyes is adjusted, and the white sensation returns even under warm incandescent bulb illumination. This is called an adaptation transition. When the eyes have sufficiently adapted, they sense the change in color that combines the illumination light transition and the adaptation transition, and this is called a total transition. The illuminating light transition and the adaptation transition occur in substantially the same direction in opposite directions, but when they are completely equal, the color constancy holds. However, in practice, color constancy is not perfect, and it manifests itself as a total shift. The different colors corresponding to the total transition are called corresponding colors.

Therefore, by obtaining a color corresponding to outdoor light under each indoor lighting, and selecting a filter having a spectral spectrum with a small total shift from the color difference between the outdoor color and the corresponding color, good color reproducibility can be obtained. A color filter can be manufactured.

In the present invention, the reference light that is the source of the corresponding color is considered to be outdoor light that is incident light. The reason is that the portable terminal color display device is almost always assumed to be used outdoors. With respect to this reference light, the effect of each indoor lighting on the color filter is calculated as a corresponding color.

First, each incident light is replaced with a standardized standard light source. The outdoor light is a standard D65 light source, the incandescent bulb, which is indoor lighting, is a standard A light source (A light source), the fluorescent lamp is a fluorescent lamp ordinary type F6 light source (F6 light source), and a fluorescent lamp three-band emission type F10 light source (F10 Light source). The D65 light source and the A light source use the spectral distribution of “standard light source and standard light source for color measurement” of JIS-Z8720, and the F6 light source and the F10 light source use the JIS-8719 “conditional chromaticity of object color”. The spectral distribution of "Evaluation method" is used.
Also, tristimulus values X, Y, Z and x of the object color to be obtained from this
The y chromaticity is calculated based on JIS-Z8701 “Color Display Method Using XYZ Color System and X ₁₀ Y ₁₀ Z ₁₀ Color System”, but actually, it is determined by integrating wavelengths of 5 nm.

As a specific procedure, the spectral spectrum of the target filter is measured, tristimulus values X, Y, and Z under a D65 light source are obtained from the measured values, and the X, Y, and Z are calculated based on the basic spectral sensitivity. The stimulus values are converted into stimulus values R, G, and B by the following conversion formula (1).

Conversion formula (1) R = 0.40024X + 0.70760Y-0.080
81Z G = -0.22630X + 1.16532Y + 0.04
570Z B = 0.91822Z

From the tristimulus values R, G, and B of the above equation, the tristimulus values R ',
G 'and B' are converted. Conversion formula (2) R ′ = 21.00000745 ° (R + 1) / (20 ° +
1) { ^Pr- 1 G '= 21.00000353} (G + 1) / (20η +
1) { ^Pg -1B '= 20.998922} (B + 1) / (20} +
1)｝ ^Pb -1 However, in the conversion formula of the A light source, ξ = 1.185719Pr = 1.0183376 η = 0.9329552Pg = 0.9886407 ζ = 0.26868087 Pb = 0.822219 However, the conversion formula of the F6 light source = 1.0485305 Pr = 1.0775564 η = 0.9725597 Pg = 0.9954452 ζ = 0.5532500 Pb = 0.8825193 However, in the conversion formula of the F10 light source, ξ = 1.0268076 Pr = 1.00429797 η = 0.9848440 Pg = 0.9974798 ζ = 0.7559704 Pb = 0.9441494

Further, the tristimulus values R ′,
G ′ and B ′ are converted into tristimulus values X ′, Y ′ and Z ′ of the corresponding color by the following conversion formula (3). Conversion formula (3) X '= 1.59995R'-1.12939G' + 0.
21990B'Y '= 0.36119R' + 0.63881G'Z '= 1.90806B'

The tristimulus values X, Y, and Z under the D65 light source thus obtained, and the tristimulus values X ', Y', and the corresponding color under the A light source, the F6 light source, and the F10 light source, respectively.
Z ′ is represented by CIE 19 by the following conversion formula (4).
76 Convert to L ^* a ^* b ^* color system. Conversion formula (4) L ^* = 116 (Y / 100) ^1/3 −16 a ^* = 500 ｛(X / 95.04) ^1/3 − (Y / 10
0) ^1/3 ｝ b ^* = 200 ｛(Y / 100) ¹ /3-(Z / 108.8
9) ^1/3 L ^* '= 116 (Y' / 100) ^1/3 -16 a ^* '= 500 (X' / 95.04) ¹ /3-(Y '/ 1
00) ^1/3 ｝ b ^* '= 200 ｛(Y ′ / 100) ^1/3 − (Z ′ / 10
8.89) ^1/3

L ^* ', a ^* ', b ^* 'and L obtained from the above equations
ΔEab ^* is obtained for each of the A light source, the F6 light source, and the F10 light source from ^* , a ^* , and b ^* by the following equation (5). Equation (5) ΔEab ^* = ｛(L ^* ′ − L ^* ) ² + (a ^* ′ − a ^* ) ² +
(B ^* '-b ^* ) ² ｝ ^1/2

The color difference ΔEab ^* is a numerical index indicating the difference in color appearance between outdoor light (D65 light source) and indoor illumination light (A light source, F6 light source, F10 light source). The difference is small, which is preferable.
Table 1 shows the numerical limitation of ΔEab ^* defined in each invention of the present application. In Table 1, ΔEab ^* (A) is the color difference between the object color of the D65 light source and the corresponding color of the A light source, ΔEab ^*
(F6) is the color difference between the object color at the D65 light source and the corresponding color of the F6 light source, ΔEab ^* (F10) is the color difference between the object color at the D65 light source and the corresponding color of the F10 light source, and ΔE _sum is the _sum of these. .

[0031]

[Table 1]

[0032]

【Example】

[Experimental example 1] Filters A to H having an arbitrarily selected spectrum having an absorbance peak wavelength of 450 to 470 nm
Were prepared, and their respective spectral spectra were measured. The measurement was performed using an Olympus microspectrophotometer OS-SP200.
(Product name) was used. From the spectrum, tristimulus values X, Y, and Z are obtained, and the conversion formulas (1) to
ΔEab ^* was determined from (5). The results are shown in Table 2 below.

[0033]

[Table 2]

Next, each of the filters A to H was subjected to incandescent illumination (comparative 1), fluorescent lamp daylight type illumination (comparative 2), and fluorescent lamp three-wavelength light emitting type illumination by five observers. Each was observed in (Comparative 3), and its superiority was evaluated by comparing with the appearance outside. Table 3 shows the results. still,
In the table, ○ indicates that the difference between the indoor and outdoor appearances is small (excellent), Δ indicates that there is a slight difference, and x indicates that the difference is large (poor).

[0035]

[Table 3]

From Tables 2 and 3, it was confirmed that as the color difference in Table 2 was smaller, the color was observed closer to the reference outdoor appearance, and significant differences A to H were recognized. Also,
In the comprehensive evaluation under each illumination, it was found that the smaller the ΔE _sum in Table 2, the smaller the difference between the standard outdoor appearance and the indoor appearance under various indoor illuminations.

[Experimental Example 2] Filters I to P having an absorbance peak wavelength at 600 to 620 nm were prepared, and Experimental Example 1 was performed.
ΔEab ^* was calculated and evaluated in the same manner as described above. The results are shown in Tables 4 and 5 below.

[0038]

[Table 4]

[0039]

[Table 5]

From Tables 4 and 5, as in Experimental Example 1, the smaller the color difference, the closer to the reference outdoor appearance, the smaller the color difference, and the smaller the ΔE _sum , the lower the reference outdoor appearance. It was found that the difference between the appearance of the object and the appearance under various illuminations indoors was small.

[Experimental Example 3] Filters Q to X having an absorbance peak wavelength at 535 to 555 nm were prepared, and Experimental Example 1 was performed.
ΔEab ^* was calculated and evaluated in the same manner as described above. The results are shown in Tables 6 and 7 below.

[0042]

[Table 6]

[0043]

[Table 7]

[0044] Table 6, Table 7, in the same manner as in Experimental Example 1, it is observed in the appearance and closer color outdoors as a reference as the small color difference, and Delta] E _sum smaller the outdoors as a reference It was found that the difference between the appearance of the object and the appearance under various illuminations indoors was small.

Example 1 A color filter for a reflection type color display device was prepared by combining the filters B, K, and R used in Experimental Examples 1 to 3, and was used under outdoor sunlight and indoor incandescent light sources. Visual comparison under a fluorescent lamp confirmed that stable color reproducibility was at a level that did not cause any practical problems.

Comparative Example 1 A color filter for a reflective color display device was manufactured by combining the filters G, O, and U used in Experimental Examples 1 to 3, and a comparative observation was performed in the same manner as in Example 1. The color reproducibility was unstable compared to No. 1.

[0047]

According to the present invention, it is possible to easily select a filter suitable for a reflection type color display device by limiting the numerical value of the color difference, and to obtain a color with stable color reproducibility under outdoor and indoor lighting. Provided is a reflective color display device which can provide a filter with high reliability and can display a uniform color image both outdoors and indoors.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Katsuhiro Shiroda, Inventor 3-30-2 Shimomaruko, Ota-ku, Tokyo Within Canon Inc. (72) Inventor Ken Miyazaki 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inside the company

Claims (12)

[Claims] 1. A tri-stimulus value X, Y, Z under a standard D65 light source of a color filter used for a reflection type color display device, which has an absorbance peak wavelength at 450 to 470 nm. Z is represented by the following conversion formula (1)
The tristimulus values X ′, Y ′, Z ′ of the corresponding color under the standard A light source obtained by substituting into (3) are converted into C by the following conversion formula (4).
IE 1976 A color filter characterized by having a color difference ΔEab ^* of 10 or less, which is converted into an L ^* a ^* b ^* color system and determined by the following equation (5). Conversion formula (1) R = 0.40024X + 0.70760Y−0.080
81Z G = -0.22630X + 1.16532Y + 0.04
570Z B = 0.91822Z Conversion formula (2) R ′ = 21.00000745 ｛(R + 1) / (20ξ +
1) { ^Pr- 1 G '= 21.00000353} (G + 1) / (20η +
1) { ^Pg -1B '= 20.998922} (B + 1) / (20} +
1)｝ ^Pb -1 However, in the conversion formula of the standard A light source, ξ = 1.185719Pr = 1.0183376 η = 0.9329552Pg = 0.9886407 ζ = 0.26868087 Pb = 0.822227 Conversion formula (3) X '= 1.85995R'-1.12939G' + 0.
21990B'Y '= 0.31619R' + 0.63881G'Z '= 1.08906B' Conversion formula (4) L ^* = 116 (Y / 100) ^1/3 -16 a ^* = 500 (X / 95.04) ) ¹ / ^3- (Y / 10
0) ^1/3 ｝ b ^* = 200 ｛(Y / 100) ¹ /3-(Z / 108.8
9) ^1/3 L ^* '= 116 (Y' / 100) ^1/3 -16 a ^* '= 500 (X' / 95.04) ¹ /3-(Y '/ 1
00) ^1/3 ｝ b ^* '= 200 ｛(Y ′ / 100) ^1/3 − (Z ′ / 10
8.89) ^1/3 {Equation (5) ΔEab ^* = {(L ^* ′ − L ^* ) ² + (a ^* ′ − a ^* ) ² +
(B ^* '-b ^* ) ² ｝ ^1/2 2. A tristimulus value X, Y, Z under a standard D65 light source of a color filter used for a reflection type color display device, which has an absorbance peak wavelength at 450 to 470 nm. Z is represented by the following conversion formula (1)
The CIE 1976 L ^* a ^* b ^* table is obtained by substituting the tristimulus values X ', Y', and Z 'of the corresponding color under the fluorescent lamp ordinary F6 light source obtained by substituting into (3) by the following conversion formula (4). Color difference ΔEab calculated by the following equation (5)
A color filter wherein ^* is 10 or less. Conversion formula (1) R = 0.40024X + 0.70760Y−0.080
81Z G = -0.22630X + 1.16532Y + 0.04
570Z B = 0.91822Z Conversion formula (2) R ′ = 21.00000745 ｛(R + 1) / (20ξ +
1) { ^Pr- 1 G '= 21.00000353} (G + 1) / (20η +
1) { ^Pg -1B '= 20.998922} (B + 1) / (20} +
1)｝ ^Pb -1 However, in the conversion formula of the F6 light source, ξ = 1.0485305 Pr = 1.0077564 η = 0.9725597 Pg = 0.9954452 ζ = 0.5532500 Pb = 0.8825193 Conversion formula (3) X ′ = 1.85995R'-1.12939G '+ 0.
21990B'Y '= 0.31619R' + 0.63881G'Z '= 1.08906B' Conversion formula (4) L ^* = 116 (Y / 100) ^1/3 -16 a ^* = 500 (X / 95.04) ) ¹ / ^3- (Y / 10
0) ^1/3 ｝ b ^* = 200 ｛(Y / 100) ¹ /3-(Z / 108.8
9) ^1/3 L ^* '= 116 (Y' / 100) ^1/3 -16 a ^* '= 500 (X' / 95.04) ¹ /3-(Y '/ 1
00) ^1/3 ｝ b ^* '= 200 ｛(Y ′ / 100) ^1/3 − (Z ′ / 10
8.89) ^1/3 {Equation (5) ΔEab ^* = {(L ^* ′ − L ^* ) ² + (a ^* ′ − a ^* ) ² +
(B ^* '-b ^* ) ² ｝ ^1/2 3. A tri-stimulus value X, Y, Z under a standard D65 light source of a color filter used for a reflection type color display device having an absorbance peak wavelength at 450 to 470 nm. Z is represented by the following conversion formula (1)
Fluorescent lamp three-wavelength emission type F obtained by substituting in (3)
The tristimulus values X ', Y', Z 'of the corresponding colors under 10 light sources are
According to the following conversion formula (4), CIE 1976 L ^* a ^* b
^* A color filter characterized by having a color difference ΔEab ^* of 7 or less, each of which is converted into a color system and determined by the following equation (5). Conversion formula (1) R = 0.40024X + 0.70760Y−0.080
81Z G = -0.22630X + 1.16532Y + 0.04
570Z B = 0.91822Z Conversion formula (2) R ′ = 21.00000745 ｛(R + 1) / (20ξ +
1) { ^Pr- 1 G '= 21.00000353} (G + 1) / (20η +
1) { ^Pg -1B '= 20.998922} (B + 1) / (20} +
1)｝ ^Pb -1 However, in the conversion formula of the F10 light source, ξ = 1.0268076 Pr = 1.0042972 η = 0.9848440 Pg = 0.9974798 ζ = 0.7559704 Pb = 0.9441494 Conversion formula (3) X ' = 1.85995R'-1.12939G '+ 0.
21990B'Y '= 0.31619R' + 0.63881G'Z '= 1.08906B' Conversion formula (4) L ^* = 116 (Y / 100) ^1/3 -16 a ^* = 500 (X / 95.04) ) ¹ / ^3- (Y / 10
0) ^1/3 ｝ b ^* = 200 ｛(Y / 100) ¹ /3-(Z / 108.8
9) ^1/3 L ^* '= 116 (Y' / 100) ^1/3 -16 a ^* '= 500 (X' / 95.04) ¹ /3-(Y '/ 1
00) ^1/3 ｝ b ^* '= 200 ｛(Y ′ / 100) ^1/3 − (Z ′ / 10
8.89) ^1/3 {Equation (5) ΔEab ^* = {(L ^* ′ − L ^* ) ² + (a ^* ′ − a ^* ) ² +
(B ^* '-b ^* ) ² ｝ ^1/2 4. A tristimulus value X, Y, Z under a standard D65 light source of a color filter used for a reflection type color display device, which has an absorbance peak wavelength at 450 to 470 nm. Z is represented by the following conversion formula (1)
Under standard A light source, under fluorescent lamp ordinary type F6 light source, and fluorescent lamp three wavelength band light emitting type F1 obtained by substituting into (3).
The tristimulus values X ', Y',
Z ′ is converted to CIE 1976 by the following conversion formula (4).
L ^* a ^* b ^{* is} converted into a color system, and the color difference ΔEab ^* obtained by the following equation (5) is 10 or less, 10 or less, and 7 or less, respectively, and the total of these is 25 or less. Color filter to be used. Conversion formula (1) R = 0.40024X + 0.70760Y−0.080
81Z G = -0.22630X + 1.16532Y + 0.04
570Z B = 0.91822Z Conversion formula (2) R ′ = 21.00000745 ｛(R + 1) / (20ξ +
1) { ^Pr- 1 G '= 21.00000353} (G + 1) / (20η +
1) { ^Pg -1B '= 20.998922} (B + 1) / (20} +
1)｝ ^Pb -1 However, in the conversion formula of the standard A light source, ξ = 1.185719Pr = 1.0183376 η = 0.9329552Pg = 0.9886407 ζ = 0.26868087 Pb = 0.822219 However, conversion of the F6 light source In the equation, ξ = 1.0485305 Pr = 1.0077564 η = 0.9725597Pg = 0.9954452 ζ = 0.5532500Pb = 0.825193 However, in the conversion equation of the F10 light source, ξ = 1.0268076 Pr = 1.0043297. η = 0.9848440 Pg = 0.9974998 ζ = 0.7559704 Pb = 0.9441494 Conversion formula (3) X ′ = 1.89595R′−1.129939G ′ + 0.
21990B'Y '= 0.31619R' + 0.63881G'Z '= 1.08906B' Conversion formula (4) L ^* = 116 (Y / 100) ^1/3 -16 a ^* = 500 (X / 95.04) ) ¹ / ^3- (Y / 10
0) ^1/3 ｝ b ^* = 200 ｛(Y / 100) ¹ /3-(Z / 108.8
9) ^1/3 L ^* '= 116 (Y' / 100) ^1/3 -16 a ^* '= 500 (X' / 95.04) ¹ /3-(Y '/ 1
00) ^1/3 ｝ b ^* '= 200 ｛(Y ′ / 100) ^1/3 − (Z ′ / 10
8.89) ^1/3 {Equation (5) ΔEab ^* = {(L ^* ′ − L ^* ) ² + (a ^* ′ − a ^* ) ² +
(B ^* '-b ^* ) ² ｝ ^1/2 5. A tri-stimulus value X, Y, Z under a standard D65 light source of a color filter used in a reflection type color display device, the filter having an absorbance peak wavelength at 600 to 620 nm. Z is represented by the following conversion formula (1)
The tristimulus values X ′, Y ′, Z ′ of the corresponding color under the standard A light source obtained by substituting into (3) are converted into C by the following conversion formula (4).
IE 1976 A color filter characterized by having a color difference ΔEab ^* of 17 or less, which is converted into an L ^* a ^* b ^* color system and determined by the following equation (5). Conversion formula (1) R = 0.40024X + 0.70760Y−0.080
81Z G = -0.22630X + 1.16532Y + 0.04
570Z B = 0.91822Z Conversion formula (2) R ′ = 21.00000745 ｛(R + 1) / (20ξ +
1) { ^Pr- 1 G '= 21.00000353} (G + 1) / (20η +
1) { ^Pg -1B '= 20.998922} (B + 1) / (20} +
1)｝ ^Pb -1 However, in the conversion formula of the standard A light source, ξ = 1.185719Pr = 1.0183376 η = 0.9329552Pg = 0.9886407 ζ = 0.26868087 Pb = 0.822227 Conversion formula (3) X '= 1.85995R'-1.12939G' + 0.
21990B'Y '= 0.31619R' + 0.63881G'Z '= 1.08906B' Conversion formula (4) L ^* = 116 (Y / 100) ^1/3 -16 a ^* = 500 (X / 95.04) ) ¹ / ^3- (Y / 10
0) ^1/3 ｝ b ^* = 200 ｛(Y / 100) ¹ /3-(Z / 108.8
9) ^1/3 L ^* '= 116 (Y' / 100) ^1/3 -16 a ^* '= 500 (X' / 95.04) ¹ /3-(Y '/ 1
00) ^1/3 ｝ b ^* '= 200 ｛(Y ′ / 100) ^1/3 − (Z ′ / 10
8.89) ^1/3 {Equation (5) ΔEab ^* = {(L ^* ′ − L ^* ) ² + (a ^* ′ − a ^* ) ² +
(B ^* '-b ^* ) ² ｝ ^1/2 6. A tristimulus value X, Y, Z under a standard D65 light source of a color filter used for a reflection type color display device having an absorbance peak wavelength at 600 to 620 nm. Z is represented by the following conversion formula (1)
The CIE 1976 L ^* a ^* b ^* table is obtained by substituting the tristimulus values X ', Y', and Z 'of the corresponding color under the fluorescent lamp ordinary F6 light source obtained by substituting into (3) by the following conversion formula (4). Color difference ΔEab calculated by the following equation (5)
A color filter, wherein ^* is 14 or less. Conversion formula (1) R = 0.40024X + 0.70760Y−0.080
81Z G = -0.22630X + 1.16532Y + 0.04
570Z B = 0.91822Z Conversion formula (2) R ′ = 21.00000745 ｛(R + 1) / (20ξ +
1) { ^Pr- 1 G '= 21.00000353} (G + 1) / (20η +
1) { ^Pg -1B '= 20.998922} (B + 1) / (20} +
1)｝ ^Pb -1 However, in the conversion formula of the F6 light source, ξ = 1.0485305 Pr = 1.0077564 η = 0.9725597 Pg = 0.9954452 ζ = 0.5532500 Pb = 0.8825193 Conversion formula (3) X ′ = 1.85995R'-1.12939G '+ 0.
21990B'Y '= 0.31619R' + 0.63881G'Z '= 1.08906B' Conversion formula (4) L ^* = 116 (Y / 100) ^1/3 -16 a ^* = 500 (X / 95.04) ) ¹ / ^3- (Y / 10
0) ^1/3 ｝ b ^* = 200 ｛(Y / 100) ¹ /3-(Z / 108.8
9) ^1/3 L ^* '= 116 (Y' / 100) ^1/3 -16 a ^* '= 500 (X' / 95.04) ¹ /3-(Y '/ 1
00) ^1/3 ｝ b ^* '= 200 ｛(Y ′ / 100) ^1/3 − (Z ′ / 10
8.89) ^1/3 {Equation (5) ΔEab ^* = {(L ^* ′ − L ^* ) ² + (a ^* ′ − a ^* ) ² +
(B ^* '-b ^* ) ² ｝ ^1/2 7. A tristimulus value X, Y, Z under a standard D65 light source of a color filter used in a reflection type color display device having a peak absorbance at 600 to 620 nm. Z is represented by the following conversion formula (1)
Fluorescent lamp three-wavelength emission type F obtained by substituting in (3)
The tristimulus values X ', Y', Z 'of the corresponding colors under 10 light sources are
According to the following conversion formula (4), CIE 1976 L ^* a ^* b
^* A color filter characterized by having a color difference ΔEab ^* of 5 or less, each of which has been converted into a color system and determined by the following equation (5). Conversion formula (1) R = 0.40024X + 0.70760Y−0.080
81Z G = -0.22630X + 1.16532Y + 0.04
570Z B = 0.91822Z Conversion formula (2) R ′ = 21.00000745 ｛(R + 1) / (20ξ +
1) { ^Pr- 1 G '= 21.00000353} (G + 1) / (20η +
1) { ^Pg -1B '= 20.998922} (B + 1) / (20} +
1)｝ ^Pb -1 However, in the conversion formula of the F10 light source, ξ = 1.0268076 Pr = 1.0042972 η = 0.9848440 Pg = 0.9974798 ζ = 0.7559704 Pb = 0.9441494 Conversion formula (3) X ' = 1.85995R'-1.12939G '+ 0.
21990B'Y '= 0.31619R' + 0.63881G'Z '= 1.08906B' Conversion formula (4) L ^* = 116 (Y / 100) ^1/3 -16 a ^* = 500 (X / 95.04) ) ¹ / ^3- (Y / 10
0) ^1/3 ｝ b ^* = 200 ｛(Y / 100) ¹ /3-(Z / 108.8
9) ^1/3 L ^* '= 116 (Y' / 100) ^1/3 -16 a ^* '= 500 (X' / 95.04) ¹ /3-(Y '/ 1
00) ^1/3 ｝ b ^* '= 200 ｛(Y ′ / 100) ^1/3 − (Z ′ / 10
8.89) ^1/3 {Equation (5) ΔEab ^* = {(L ^* ′ − L ^* ) ² + (a ^* ′ − a ^* ) ² +
(B ^* '-b ^* ) ² ｝ ^1/2 8. A tri-stimulus value X, Y, Z under a standard D65 light source of a color filter used for a reflection type color display device having an absorbance peak wavelength at 600 to 620 nm. Z is represented by the following conversion formula (1)
Under standard A light source, under fluorescent lamp ordinary type F6 light source, and fluorescent lamp three wavelength band light emitting type F1 obtained by substituting into (3).
The tristimulus values X ', Y',
Z ′ is converted to CIE 1976 by the following conversion formula (4).
The color difference ΔEab ^* obtained by conversion into the L ^* a ^* b ^* color system and determined by the following equation (5) is 17 or less, 14 or less, 5 or less, respectively, and the sum of these is 35 or less. Color filter to be used. Conversion formula (1) R = 0.40024X + 0.70760Y−0.080
81Z G = -0.22630X + 1.16532Y + 0.04
570Z B = 0.91822Z Conversion formula (2) R ′ = 21.00000745 ｛(R + 1) / (20ξ +
1) { ^Pr- 1 G '= 21.00000353} (G + 1) / (20η +
1) { ^Pg -1B '= 20.998922} (B + 1) / (20} +
1)｝ ^Pb -1 However, in the conversion formula of the standard A light source, ξ = 1.185719Pr = 1.0183376 η = 0.9329552Pg = 0.9886407 ζ = 0.26868087 Pb = 0.822219 However, conversion of the F6 light source In the equation, ξ = 1.0485305 Pr = 1.0077564 η = 0.9725597Pg = 0.9954452 ζ = 0.5532500Pb = 0.825193 However, in the conversion equation of the F10 light source, ξ = 1.0268076 Pr = 1.0043297. η = 0.9848440 Pg = 0.9974998 ζ = 0.7559704 Pb = 0.9441494 Conversion formula (3) X ′ = 1.89595R′−1.129939G ′ + 0.
21990B'Y '= 0.31619R' + 0.63881G'Z '= 1.08906B' Conversion formula (4) L ^* = 116 (Y / 100) ^1/3 -16 a ^* = 500 (X / 95.04) ) ¹ / ^3- (Y / 10
0) ^1/3 ｝ b ^* = 200 ｛(Y / 100) ¹ /3-(Z / 108.8
9) ^1/3 L ^* '= 116 (Y' / 100) ^1/3 -16 a ^* '= 500 (X' / 95.04) ¹ /3-(Y '/ 1
00) ^1/3 ｝ b ^* '= 200 ｛(Y ′ / 100) ^1/3 − (Z ′ / 10
8.89) ^1/3 {Equation (5) ΔEab ^* = {(L ^* ′ − L ^* ) ² + (a ^* ′ − a ^* ) ² +
(B ^* '-b ^* ) ² ｝ ^1/2 9. A tristimulus value X, Y, Z under a standard D65 light source of a color filter used in a reflection type color display device, which has an absorbance peak wavelength at 535 to 555 nm. Z is represented by the following conversion formula (1)
The tristimulus values X ′, Y ′, Z ′ of the corresponding color under the standard A light source obtained by substituting into (3) are converted into C by the following conversion formula (4).
IE 1976 A color filter characterized by having a color difference ΔEab ^* of 28 or less, which is converted into an L ^* a ^* b ^* color system and determined by the following equation (5). Conversion formula (1) R = 0.40024X + 0.70760Y−0.080
81Z G = -0.22630X + 1.16532Y + 0.04
570Z B = 0.91822Z Conversion formula (2) R ′ = 21.00000745 ｛(R + 1) / (20ξ +
1) { ^Pr- 1 G '= 21.00000353} (G + 1) / (20η +
1) { ^Pg -1B '= 20.998922} (B + 1) / (20} +
1)｝ ^Pb -1 However, in the conversion formula of the standard A light source, ξ = 1.185719Pr = 1.0183376 η = 0.9329552Pg = 0.9886407 ζ = 0.26868087 Pb = 0.822227 Conversion formula (3) X '= 1.85995R'-1.12939G' + 0.
21990B'Y '= 0.31619R' + 0.63881G'Z '= 1.08906B' Conversion formula (4) L ^* = 116 (Y / 100) ^1/3 -16 a ^* = 500 (X / 95.04) ) ¹ / ^3- (Y / 10
0) ^1/3 ｝ b ^* = 200 ｛(Y / 100) ¹ /3-(Z / 108.8
9) ^1/3 L ^* '= 116 (Y' / 100) ^1/3 -16 a ^* '= 500 (X' / 95.04) ¹ /3-(Y '/ 1
00) ^1/3 ｝ b ^* '= 200 ｛(Y ′ / 100) ^1/3 − (Z ′ / 10
8.89) ^1/3 {Equation (5) ΔEab ^* = {(L ^* ′ − L ^* ) ² + (a ^* ′ − a ^* ) ² +
^{(B * '-b *) 2} } 1/2 10. A tristimulus value X, Y, Z under a standard D65 light source of a color filter used in a reflection type color display device having a peak absorbance at 535 to 555 nm. Z is represented by the following conversion formula (1)
The tristimulus values X ', Y', and Z 'of the corresponding color under the fluorescent lamp ordinary type F6 light source obtained by substituting into the formulas (3) to (3) are converted into CIE 1976 L ^* a ^* b ^* by the following conversion formula (4) ^. Color difference ΔEa calculated by the following equation (5) after conversion into color system
A color filter, wherein b ^* is 10 or less. Conversion formula (1) R = 0.40024X + 0.70760Y−0.080
81Z G = -0.22630X + 1.16532Y + 0.04
570Z B = 0.91822Z Conversion formula (2) R ′ = 21.00000745 ｛(R + 1) / (20ξ +
1) { ^Pr- 1 G '= 21.00000353} (G + 1) / (20η +
1) { ^Pg -1B '= 20.998922} (B + 1) / (20} +
1)｝ ^Pb -1 However, in the conversion formula of the F6 light source, ξ = 1.0485305 Pr = 1.0077564 η = 0.9725597 Pg = 0.9954452 ζ = 0.5532500 Pb = 0.8825193 Conversion formula (3) X ′ = 1.85995R'-1.12939G '+ 0.
21990B'Y '= 0.31619R' + 0.63881G'Z '= 1.08906B' Conversion formula (4) L ^* = 116 (Y / 100) ^1/3 -16 a ^* = 500 (X / 95.04) ) ¹ / ^3- (Y / 10
0) ^1/3 ｝ b ^* = 200 ｛(Y / 100) ¹ /3-(Z / 108.8
9) ^1/3 L ^* '= 116 (Y' / 100) ^1/3 -16 a ^* '= 500 (X' / 95.04) ¹ /3-(Y '/ 1
00) ^1/3 ｝ b ^* '= 200 ｛(Y ′ / 100) ^1/3 − (Z ′ / 10
8.89) ^1/3 {Equation (5) ΔEab ^* = {(L ^* ′ − L ^* ) ² + (a ^* ′ − a ^* ) ² +
(B ^* '-b ^* ) ² ｝ ^1/2 11. A tri-stimulus value X, Y, Z under a standard D65 light source of a color filter used for a reflection type color display device, which has an absorbance peak wavelength at 535 to 555 nm. Z is represented by the following conversion formula (1)
The tristimulus values X ′, Y ′, and Z ′ of the corresponding colors under the fluorescent lamp three-wavelength emission type F10 light source obtained by substituting the values into (3) to (3) are used as CIE 1976 L ^* a according to the following conversion formula (4).
A color filter characterized by having a color difference ΔEab ^* of 10 after being converted into a ^* b ^* color system and determined by the following equation (5). Conversion formula (1) R = 0.40024X + 0.70760Y−0.080
81Z G = -0.22630X + 1.16532Y + 0.04
570Z B = 0.91822Z Conversion formula (2) R ′ = 21.00000745 ｛(R + 1) / (20ξ +
1) { ^Pr- 1 G '= 21.00000353} (G + 1) / (20η +
1) { ^Pg -1B '= 20.998922} (B + 1) / (20} +
1)｝ ^Pb -1 However, in the conversion formula of the F10 light source, ξ = 1.0268076 Pr = 1.0042972 η = 0.9848440 Pg = 0.9974798 ζ = 0.7559704 Pb = 0.9441494 Conversion formula (3) X ' = 1.85995R'-1.12939G '+ 0.
21990B'Y '= 0.31619R' + 0.63881G'Z '= 1.08906B' Conversion formula (4) L ^* = 116 (Y / 100) ^1/3 -16 a ^* = 500 (X / 95.04) ) ¹ / ^3- (Y / 10
0) ^1/3 ｝ b ^* = 200 ｛(Y / 100) ¹ /3-(Z / 108.8
9) ^1/3 L ^* '= 116 (Y' / 100) ^1/3 -16 a ^* '= 500 (X' / 95.04) ¹ /3-(Y '/ 1
00) ^1/3 ｝ b ^* '= 200 ｛(Y ′ / 100) ^1/3 − (Z ′ / 10
8.89) ^1/3 {Equation (5) ΔEab ^* = {(L ^* ′ − L ^* ) ² + (a ^* ′ − a ^* ) ² +
(B ^* '-b ^* ) ² ｝ ^1/2 12. A tri-stimulus value X, Y, Z under a standard D65 light source of a color filter used in a reflection type color display device, which has an absorbance peak wavelength at 535 to 555 nm. Z is represented by the following conversion formula (1)
Under a standard A light source, a fluorescent lamp ordinary type F6 light source, and a fluorescent lamp three-wavelength band light emitting type F obtained by substituting into (3)
The tristimulus values X ′, Y ′, of the corresponding colors under 10 light sources
Z ′ is converted to CIE 1976 by the following conversion formula (4).
The color difference ΔEab ^* obtained by conversion into the L ^* a ^* b ^* color system and obtained by the following equation (5) is 28 or less, 10 or less, and 30 or less, respectively, and the sum of these is 45 or less. Color filter to be used. Conversion formula (1) R = 0.40024X + 0.70760Y−0.080
81Z G = -0.22630X + 1.16532Y + 0.04
570Z B = 0.91822Z Conversion formula (2) R ′ = 21.00000745 ｛(R + 1) / (20ξ +
1) { ^Pr- 1 G '= 21.00000353} (G + 1) / (20η +
1) { ^Pg -1B '= 20.998922} (B + 1) / (20} +
1)｝ ^Pb -1 However, in the conversion formula of the standard A light source, ξ = 1.185719Pr = 1.0183376 η = 0.9329552Pg = 0.9886407 ζ = 0.26868087 Pb = 0.822219 However, conversion of the F6 light source In the equation, ξ = 1.0485305Pr = 1.0777564 η = 0.9725597Pg = 0.9954452 ζ = 0.5532500Pb = 0.825193. However, in the conversion equation of the F10 light source, ２６ = 1.0268076Pr = 1.0043297. η = 0.9848440 Pg = 0.9974998 ζ = 0.7559704 Pb = 0.9441494 Conversion formula (3) X ′ = 1.89595R′−1.129939G ′ + 0.
21990B'Y '= 0.31619R' + 0.63881G'Z '= 1.08906B' Conversion formula (4) L ^* = 116 (Y / 100) ^1/3 -16 a ^* = 500 (X / 95.04) ) ¹ / ^3- (Y / 10
0) ^1/3 ｝ b ^* = 200 ｛(Y / 100) ¹ /3-(Z / 108.8
9) ^1/3 L ^* '= 116 (Y' / 100) ^1/3 -16 a ^* '= 500 (X' / 95.04) ¹ /3-(Y '/ 1
00) ^1/3 ｝ b ^* '= 200 ｛(Y ′ / 100) ^1/3 − (Z ′ / 10
8.89) ^1/3 {Equation (5) ΔEab ^* = {(L ^* ′ − L ^* ) ² + (a ^* ′ − a ^* ) ² +
(B ^* '-b ^* ) ² ｝ ^1/2