JP3489023B2 - Method to compensate for non-uniformity of primary color display of color monitor - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of compensating for display nonuniformity due to changes in primary colors of a color monitor.

[0002]

2. Description of the Related Art A general color monitor is red,
It has three primary colors, green and blue. If the chromaticity coordinates of one primary color in each pixel combined on the monitor screen are not the same, the color display of the primary color will be non-uniform. It is also possible to select a set of new primary colors from the distribution of the chromaticity coordinates of the primary colors and create each new primary color with the original three primary colors in each pixel. However, just one light source, because no can generate an new primaries selected, the new primary colors are called virtual primaries. When implementing, replace the original primary colors with virtual primary color combinations. This is because the chromaticity coordinate of the virtual primary color is the same as that of each pixel, and the color display becomes uniform. This method is generally called a virtual primary color method and can be applied to any monitor in which color nonuniformity occurs.

Normally, a monitor screen consists of many pixels,
One pixel in the color monitor can emit light of three primary colors. However, such display technology causes color nonuniformity. For example, when it is desired to display primary colors with the same brightness on the entire screen, different colors are displayed in different areas of the screen, and if the primary colors are not displayed uniformly, different colors will be displayed. This phenomenon is one of the main causes of the deterioration of the image quality of the LED monitor. Further, each pixel of the matrix type color light emitting diode monitor is composed of light emitting diodes of three colors of red, blue and green, and the scan type color light emitting diode monitor emits light of one or a plurality of linear matrices on one scan screen. Besides, because these two kinds of monitors need to use a large amount of light emitting diodes and there is a considerable difference in the optical and electrical characteristics of different light emitting diodes, the light emitting diode monitors have excellent color uniformity. Not not. For example, the manufacturer makes a selection before shipping the light emitting diode, and usually, the selected blue or green light emitting diode has a change amount of chromaticity coordinates of 10% or more, and such a change amount is uniform. Color display cannot be achieved, but the amount of change can be suppressed by selecting an excellent light emitting diode. However, a matrix-type monitor with a resolution of 800 × 600 requires at least 480,000 light emitting diodes for each primary color. Therefore, it is very difficult to carry out the above-mentioned selection method with such a quantity.

[0004]

It is an object of the present invention to solve the above problems and to compensate for display non-uniformity due to changes in the primary colors of a color monitor by using the virtual primary color method.

[0005] The present invention is put to each pixel of a color monitor
The chromaticity coordinates and maximum brightness of each primary color are measured.The maximum brightness is the brightness generated when a constant current or voltage is applied to the primary color light source, and when the primary color emission is modulated by the pulse width. , the luminance is an average value in the time slot, determined from the measured values of each primary color in every pixel
Fall within the maximum tristimulus values of red, green, and blue
A set of virtual primaries are chosen such, characteristics of the virtual primaries are tables by chromaticity coordinates and maximum brightness, all pixels have the same virtual primaries, virtual primaries and tristimulus values for the primaries the tristimulus values identical or so as to similar input movies
Obtains the conversion factor for converting the image signal to the light source modulation signal, converts the input video signal to the light source modulation signal, characterized in that you create a driving signal of the primary color by the light source modulation signal, of the color monitor primary display A method of compensating for non-uniformity is provided.

[0006]

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 shows a CIE1931 according to the present invention.
FIG. 3 is a coordinate diagram showing a distribution of primary colors in an (X, Y) chromaticity coordinate system and showing a triangular color region of the example.
FIG. 2 is a coordinate diagram showing color regions of two sets of virtual primary colors selected based on FIG. 1, and FIG. 3 shows a system for converting an input image signal into a light source modulation signal to compensate for color nonuniformity. 4 is a block diagram, FIG. 4 is a block diagram of operation of the arithmetic logic circuit in FIG. 3, and FIG. 5 is a CIE according to the present invention.
FIG. 7 is a coordinate diagram showing a distribution of four types of primary colors in the 1931 (X, Y) chromaticity coordinate system and showing a quadrangle color region of the example, and FIG. 6 shows a set of four color regions selected based on FIG. FIG. 8 is a coordinate diagram showing color regions of one virtual primary color, and FIG. 7 is a block diagram of a system for inputting red, green, and blue to convert a video signal into four types of light source modulation signals.
FIG. 9 is a block diagram of a system for converting four types of video signals into four types of light source modulation signals, and FIG. 9 is a block diagram of operation of the arithmetic logic circuit in FIG.

Here, the virtual primary color method will be described with reference to the CIE 1931 chromaticity coordinate system. This method can also be used with other chromaticity coordinate systems.

As shown in FIG. 1, according to the method of compensating for the non-uniformity of the display due to the change of the primary color of the color monitor of the present invention,
The chromaticity coordinates of the three primary colors of red, green, and blue are in the R, G, and B quadrangular castles, respectively, and may have a shape similar to that area, and such an area is generally called a primary color area . Further, the chromaticity coordinates of the three vertices of the triangle may be the chromaticity coordinates of a set of primary colors, and the color region within the triangle is formed by a set of primary colors, and the triangular region is called a color region triangle. Further, each pixel in the monitor has a color gamut triangle corresponding to it, and its apex is located at any one point in the corresponding primary color gamut, and such a color gamut triangle is called a primary color gamut triangle, The coordinates of the vertices are called virtual primary color area triangles.

As mentioned above, in selecting a virtual primary color
Therefore, the virtual primary color area triangle is located within the primary color area triangle.
Then, a similar virtual color area is displayed on each pixel on the monitor.
It This method has a small color area, but the color of the light emitting diode is
Since the saturation is high, the selected virtual color area is
Larger than the range, for example, CRT monitor or LCD monitor
Is an example. Also, with other methods of selecting virtual primary colors
Then, as shown in FIG._vi, G _viAnd B_vi
Denote the virtual primary colors of the i-th group of red, green, and blue, respectively.
Both (i = 1, 2) also have a virtual color area corresponding to the virtual primary color.
Show. Also, as shown in the figure, the first set of color regions is the second
Larger than the set, the largest virtual color area is the primary color from all vertices
Located between the areas. However, the largest color gamut is the best choice.
Since it is not an option, it is better to select it according to the usage situation.
For example, there are other monitor technologies that select virtual primary colors.
Simulates CRT or LCD primary colors.

The brightness of the light output from the light emitting diode being monitored can be controlled by an amplitude modulation method or a pulse width modulation method. When the amplitude modulation method is used,
The brightness of the output light is proportional to the signal, and when the pulse width modulation method is used, the time is divided into time slots having the same interval, and the pulse width of the output light is proportional to the signal within one time slot. . Also, if the width of the time slot is appropriate, the visual brightness is proportional to the average brightness of the time slot. Therefore, although the intensity of the square light pulse is the same for all time slots, the visual effect of the pulse can be adjusted by the amplitude modulation scheme. Furthermore,
If the virtual primary color method is used in a pulse width modulation system, the brightness represents the average brightness of one time slot, and the brightness I can be expressed by the formula I = s × I ^m . s conditions are 0 ≦ s ≦ 1, ^{I m} represents the maximum brightness. When used in an amplitude modulation system, s is related to the intensity of the signal that activates the light emitting diode, and when used in a pulse width modulation system, s is related to the pulse width of the activation signal. Therefore, the maximum brightness I ^m here is not the maximum brightness generated by the light emitting diode but the brightness generated by a constant operating current.

[0012] red, the chromaticity coordinates of the green and blue virtual primary colors respectively _{(X vr, Y vr),} (X v g, Y vg) and _{(X vb, Y} vb) with represented by red, green And the maximum luminance of the virtual primary colors of blue are I ^m _vr , I ^m _vg , and
And represented by ^I _{m vb.} When selecting these maximum luminances, the luminances required for the primary colors must always be positive values, and the proportionality between them must satisfy the condition of white balance.

For example, the luminances generated from the virtual primary colors of red, green, and blue at the j-th pixel in the frame n in FIG. 1 are I _vr (n, j), I _vg (n, j) and I _vg, respectively.
_vb (n, j), (n, j = 1,2,3 ...), and

[0014]

[Equation 15]

Can be expressed as S _r (n,
j), s _g (n, j) and s _b (n, j) are red,
Green and blue video signals. Furthermore,

[0016]

[Equation 16] The input video signal in is usually represented by RGB, and the relationship between the CIE tristimulus values and the chromaticity coordinates is

[0017]

[Equation 17]

And

[0019]

[Equation 18]

[0020] Among them, X ^m _vα , Y ^m _vα and Z ^m _vα are the three maximum color stimulus values corresponding to the virtual primary colors, respectively, and X _vα (n, j) and Y _vα (n, j)
And Z _vα (n, j) are tristimulus values of the virtual primary color at the j-th pixel in the frame n in FIG.
It is a constant for converting to a stimulus value.

In order to achieve white balance or increase in brightness, one or more light emitting diodes of the same color are required in the pixel, for example, the i-th red, green and blue colors in the j-th pixel. The chromaticity coordinates of the light emitting diode are (x _ori (j), y _ori (j)),
(X _ogi (j), y _ogi (j)) and (x
_{obi (j),} as well as a _y obi (j)), the maximum luminance respectively ^I _{m ori} of the i-th red, green and blue light emitting diodes in the j-th pixel in FIG n frames
_{^{(J), I m ogi (}} j). And ^I _m is _obi (j), the i-th red in the j-th pixel of FIG n frames, green and blue all brightness of the light emitting diodes are each _{I ort (n, j),} I ogt (N, j). And I
_obt (n, j). Therefore, they are

[0022]

[Formula 19]

It can be expressed by the following equation. N _{r in it} ,
N _g and N _b are the numbers of red, green and blue light emitting diodes in the pixel, respectively, and a _r (n,
j), a _g (n, j) and a _b (n, j) are red,
Input signals of green and blue LEDs, the range of which is

[0024]

[Equation 20]

It can be expressed by the following equation. Since the amplitude modulation or the pulse width modulation of the light emitting diode is performed by using those input signals, the signal is called a light source modulation signal. The point to be noted here is that the size of the luminance of the light emitting diode is not proportional to the size of the starting current for amplitude modulation, and the luminance is not proportional to the pulse width of the starting current for pulse width modulation. Therefore, it is necessary to change the equation as shown below.

[0026]

[Equation 21]

And

[0028]

[Equation 22]

[0029] _{^X m} ^oα therein _{^{(j), Y m oα (}} j)
And Z ^m _oα (j) are the tristimulus values of the primary color corresponding to the j-th pixel, and X ^t _oα (n, j), Y ^t _oα (n,
j) and Z ^t _oα (n, j) indicate the tristimulus values of the primary color corresponding to the j-th pixel in the frame n in FIG.

If the parameters of the light emitting diode in each pixel of the monitor are known from the above definition, the virtual primary color can be selected and the emission brightness of the primary color can be made a positive value by using the method described below.

The maximum value of the tristimulus values in the virtual red primary color is

[0032]

[Equation 23]

It is selected by the formula: ^{Xm in it}
_or (j), Y ^m _or (j) and Z ^m _or (j) are the maximum tristimulus values of the red primary color at the j-th pixel of the monitor, and Min {V (j)} is It is the minimum value V for all j, and Max {V (j)} is the maximum value V for all j. Furthermore, the maximum value of the tristimulus values in the virtual green primary color is

[0034]

[Equation 24]

X ^m _{o g} in which is selected by the formula
_{^{(J), Y m og (}} j), and ^Z _m og (j) is the maximum value of the tristimulus values of the green primary color in the j-th pixel of the monitor. The maximum value of the tristimulus values in the blue virtual primary color is

[0036]

[Equation 25]

It is selected by the expression of [0037], ^X _{m ob} therein
_{^{(J), Y m ob (}} j), and ^Z _m ob (j) is the maximum value of the tristimulus values of the green primary color in the j-th pixel of the monitor.

As described above, the maximum luminance and chromaticity coordinates of each virtual primary color can be selected by the equations (7a) to (7c), respectively. In that case, naturally, it is necessary to adjust the ratio between the maximum luminance in each virtual primary color by the white balance. The reason why this method is effective will be described below.

Generally, the X stimulus value of the red light emitting diode, the Y stimulus value of the green light emitting diode and the Z stimulus value of the blue light emitting diode are respectively calculated from the other two stimulus values of the red light emitting diode, the green light emitting diode and the blue light emitting diode. large. Here, the virtual primary color of red will be described as an example. Since the red X stimulus value is the minimum value, it can be generated from the red light emitting diode in each pixel.
The Y and Z stimulus values are maximum and cannot be generated from the red light emitting diode. However, the shortage can be easily supplemented by the green and blue light emitting diodes in the same pixel. Therefore, the condition of Expression (5) can be satisfied. Expressions (7a) to (7c) are used when the light emitting diode is arranged in each pixel of the monitor, and if the virtual primary color is determined before the light emitting diode is installed, the expression (7a) is used. (7c) to (7c) may be slightly changed based on this method.

Next, the relationship between the light source modulation signal and the input video signal will be described. The condition at that time is to make the tristimulus values of light generated from all the light emitting diodes in the pixel equal to the tristimulus values of all virtual primary colors. The relationship can be determined by the following formula.

[0041]

[Equation 26]

The light source modulation signal is obtained by this equation (8).

[0043]

[Equation 27]

A point to be noted here is that the light emitting diode continuously emits light for each pixel on the screen of the scan type light emitting diode monitor, but if the light source modulation signals of the same figure frame simultaneously perform light source modulation. Not necessarily. Also,
In equation (9), c _αβ (j), (α, β = r, g,
b) is a conversion coefficient, and further expressed by an equation,

[0045]

[Equation 28]

It becomes as follows. Therefore, when the virtual primary color method is used, the coefficient in Expression (10) cannot be obtained without measuring the chromaticity coordinates and the luminance of each light emitting diode in the monitor, but if the conversion coefficient is known, The imported video signal can be converted into a light source modulation signal by using software or hardware.

As shown in FIG. 3, the conversion coefficient (c _αβ (j)) of each pixel being monitored is calculated by the equation (10) and stored in the memory. Further, the control unit controls the input video signals s _r (n, j), s _g (n, j) and s
Upon receiving _b (n, j), the corresponding conversion factor is downloaded into three arithmetic logic circuits (ALU), which convert the signals by the parallel operation of equation (9). Also, as shown in FIG. 4, the outputs of these three arithmetic logic circuits are the light source modulation signals.

Therefore, if three or more primary colors are used for the monitor, the color reproduction range can be increased and the non-uniform color expression on this type of monitor can be compensated by the virtual primary color method. An example is a matrix LED monitor, which has a yellow-green color in addition to red, green and blue. Also, FIG.
As shown in, the chromaticity coordinates of the red, yellow-green, green, and blue primary colors are distributed in the R, YG, G, and B quadrangular ranges, respectively, and their vertices are color regions in the primary color range. It appears in a square. Such a square is called a color reproduction range square. Further, as shown in the figure, the color reproduction range square of the selected virtual primary color occurs within the original color reproduction range square. As shown in FIG. 6, the maximum luminance of the four virtual primary colors must be selected so that the luminance of the primary colors necessary for generating the virtual primary colors is always a positive value, and the ratio between them is white. It needs to be adjusted according to the balance.

Further, normally, the video signals are input only by three kinds of red, green and blue, and in the case of the four primary color monitor, the corresponding four primary color video signals are obtained by the rule of color separation, and the rule and the formula (8) ) Are used for the corresponding red, yellow-green, green and blue light source modulation signals a _r (n, j), a _y (n, j), a _g (n,
j), and a _b (n, j) can be obtained. Therefore,

[0050]

[Equation 29]

It can be expressed by the following equation, in which c ′ _αβ
(J) and (α = r, y, g, b; β = r, g, b) are conversion factors.

According to the equation (11), as shown in FIG.
The operation principle and the system block diagram shown in FIG. 3 are similar, and the operation of the arithmetic logic circuit in FIG. 7 is the same as that in FIG.
The outputs of these four arithmetic logic circuits are light source modulation signals.

As another compensation method for the four primary color monitor
There are four corresponding reds according to the rules of color separation.
Color, yellow-green, green and blue video signals s ″_r(N,
j), s " _y(N, j), s ″_g(N, j) and s ″_b
There is a method of obtaining (n, j), and these video signals are light sources.
Converted to modulated signal. Method for obtaining equation (9) and similar
The similar method has the following relationship.

[0054]

[Equation 30]

C ′ _αβ ′ (j), (α = r,
y, g, b; β = r, y, g, b) is a conversion coefficient, and the point to note here is that the selection method of the conversion coefficient is not limited to one. According to equation (12), FIG.
The operation principle is similar to that of the system block diagram shown in FIG. 3, and FIG. 9 shows the operation of the arithmetic logic circuit in FIG. 8. The outputs of these four arithmetic logic circuits are the light source modulation. It is a signal.

[Brief description of drawings]

FIG. 1 is a CIE1931 (X, Y) according to the present invention.
A coordinate diagram showing the distribution of the primary colors in the chromaticity coordinate system and showing the triangular color region of the example.

FIG. 2 is a coordinate diagram showing color regions of two sets of virtual primary colors selected based on FIG.

[Fig. 3] Converting an input video signal into a light source modulation signal,
Block diagram of a system for compensating for color inhomogeneity

FIG. 4 is a calculation block of the arithmetic logic circuit in FIG.

FIG. 5: CIE1931 (X, Y) according to the present invention
A coordinate diagram showing the distribution of four types of primary colors in the chromaticity coordinate system and showing the rectangular color area of the example.

6 is a coordinate diagram showing a color region of a set of four virtual primary colors selected based on FIG.

FIG. 7 is a block diagram of a system for converting a video signal into four types of light source modulation signals by inputting red, green and blue.

FIG. 8 is a block diagram of a system that converts four types of video signals into four types of light source modulation signals.

9 is a block diagram of the arithmetic operation of the arithmetic logic circuit in FIG.

Continuation of the front page (56) Reference JP-A-10-309911 (JP, A) JP-A-10-241860 (JP, A) JP-A-10-242513 (JP, A) JP-A-11-31845 (JP , A) JP 8-30231 (JP, A) JP 8-16130 (JP, A) JP 7-311560 (JP, A) JP 7-306659 (JP, A) JP 7-28427 (JP, A) JP-A-6-195036 (JP, A) JP-A-6-124069 (JP, A) JP-A-3-290618 (JP, A) JP-A-6-19425 (JP, A) A) International publication 98/05078 (WO, A1) (58) Fields investigated (Int.Cl. ⁷ , DB name) G09G 3/32 G09G 3/20 641 G09G 3/20 642

Claims (10)

(57) [Claims] 1. A measured chromaticity coordinates and the maximum luminance of each primary color in each pixel of a color monitor, with the maximum luminance is the luminance that occurs when applied constant current or voltage to the primary colors of light sources, primary colors when the emission is modulated by the pulse width, the luminance is an average value in the time slot, the number 1 to number below from the measured values of each primary color in every pixel
Maximum three stimuli of red, green, and blue that can be obtained by the formula 3
A set of virtual primaries are selected to fall within the value, characteristics of the virtual primaries are tables by chromaticity coordinates and maximum brightness, all pixels have the same virtual primaries, tristimulus of each primary color the tristimulus values of the values and the virtual primary colors so as to equal or be similar, the input video signal to the light source modulation signal
How calculated conversion coefficient for converting converts the input video signal to the light source modulation signal, characterized in that you create a driving signal of the primary color by the light source modulation signal to compensate for non-uniformity of the display of the color monitor primary colors. [Equation 1] The maximum value of the tristimulus values of the virtual primary color of red is obtained by the following equation, and X ^m _or (j), Y ^m _or (j) and Z ^m _or (j) are
The maximum value of the tristimulus values of the red primary color at the j-th pixel of the color monitor, Min {V (j)} is the minimum value V for all j, and Max {V (j)}. Is the maximum value V for all j, and Maximum value is determined at the tristimulus values of the virtual primary colors in the green by the _{^{formula, X m og (j),}} Y m og (j) and ^Z _m og (j) is
It is the maximum value of the tristimulus values of the primary color of green at the j-th pixel of the color monitor, and Maximum value is determined at the tristimulus values of the virtual primary colors in the blue by the _{^{formula, X m ob (j),}} Y m ob (j) and ^Z _m ob (j) is
It is the maximum value among the tristimulus values of the blue primary color in the j-th pixel of the color monitor. 2. The method for compensating non-uniformity of primary color display on a color monitor according to claim 1, wherein the ratio between the maximum luminances of the virtual primary colors is adjusted by the white balance. 3. A primary color and a virtual color in a three-primary color monitor.
The relationship between the tristimulus values of the primary colors is as follows : In _{^{and, X t oα (n, j}} ), Y t oα (n, j) and _{^Z t} ^oα
(N, j) is the tristimulus value of the α-color primary color at the j-th pixel of the n-th screen frame, α represents red, green, or blue, and X _vα (n, j), Y _vα ( n, j) and Z _vα (n,
j) is the tristimulus value of the α-color virtual primary color at the j-th pixel of the n-th screen frame, α indicates red, green, or blue, and the relationship between the light source modulation signal and the input video signal is Number 5] And a _r which is the light source modulation signal of the primary colors of red, green, and blue in the j-th pixel of the n-th screen frame
_{(N, j), a g} (n, j) and _a b (n, j) is _{obtained, S r (n, j)} , S g (n, j) and _S b (n, j)
Are input image signals of red, green and blue primary colors at the j-th pixel of the n-th screen frame of the color monitor respectively, and C _αβ (j) is a conversion coefficient for the j-th pixel of the color monitor. A method for compensating for non-uniformity of primary color display of a color monitor according to claim 1, characterized in that there is. 4. A primary color on a color monitor having four or more primary colors
The relationship with the virtual primary color is , And the case where the input video signal is red, only green and blue three-color signal to separate the specific gravity or input video signals of each primary _{^{color, X t oα (n, j}} ), Y t oα (n, j) and _{^Z t} ^oα
(N, j) are all tristimulus values of the α-color primary color at the j-th pixel of the n-th screen frame of the color monitor, where α is red , yellow-green , green , or blue One of X _vα (n, j), Y _vα (n, j) and Z _vα (n, j
j) are all tristimulus values of the α-color virtual primary color in the j-th pixel of the n-th screen frame, and α in them is the primary
It is one of the colors , and the sum of the tristimulus values of the equation ( 6) is a sum of tristimulus values of all the primary colors, and the relationship between the light source modulation signal and the input video signal is ] And a _α (n, j) is obtained, and S ^m _β (n, j)
Is the input video signal of the β primary color at the j-th pixel of the n-th screen frame of the color monitor, and when converting the input video signals of red, green and blue, S ^m _β (n,
j) is an input video signal, β represents red, green, or blue, and when converting a video signal of four or more colors, S
^m _β (n, j) is an input video signal corresponding to each primary color separated by the red , yellow-green , green or blue input video signal, β is one of them, and C ^m _αβ (j 2.) The method of compensating non-uniformity of primary color display of the color monitor according to claim 1, wherein) is a conversion coefficient at the j-th pixel of the color monitor. 5. A store conversion coefficients into a memory, and download the stored transformed coefficients in the arithmetic logic circuit, and wherein the conversion of the input video signal to the light source modulation signal by the arithmetic logic circuit, to claim 1 A method for compensating for the non-uniformity of the display of the primary colors of the described color monitor. In wherein each pixel to be used for color monitor
The chromaticity coordinates and the maximum brightness of each primary color are measured, and the maximum brightness is the brightness generated when a constant current or voltage is applied to the light source of the primary color, and when the emission of the primary color is modulated by the pulse width, Luminance is average over time slots
A value, the number 8 the number below from the measured values of each primary color in every pixel
The largest red, green, and blue sashimi that can be calculated by the formula 10
A set of virtual primaries to be within the intense value is selected, the characteristics of the virtual primaries are tables by chromaticity coordinates and maximum brightness,
After all pixels have the same virtual primary color and a light source for generating the primary color is provided in the color monitor, the chromaticity coordinates and maximum brightness of the primary color of each pixel are measured, and the tristimulus value of each primary color is measured. a tristimulus value of the virtual primary colors identical or so as to similarity, the input video signal to the light source modulation signal and
How calculated conversion coefficient for converting converts the input video signal to the light source modulation signal, characterized in that you create a driving signal of the primary color by the light source modulation signal to compensate for non-uniformity of the display of the color monitor primary colors. [Equation 8] The expression, when included in one pixel N _r pieces of red primary color light sources, the maximum value of the tristimulus values of the selected red virtual primaries are _{^{obtained, X m or (j),}} Y m or (j ) And Z ^m _or (j) are the maximum tristimulus values of the red primary color used for the j-th color monitor, and Min {V (j)} is the minimum value V for all j. Yes, Max {V (j)} is the maximum value V for all j, and The expression, when included in one pixel N _g-number of green primary color light sources, prompts the maximum value of the tristimulus values of the selected green virtual _{^{primaries, X m og (j),}} Y m og ( j) and Z ^m _{og (j)} is the maximum value of the tristimulus values of the green primary color used in the j-th color monitor, Equation 10] The expression, when included in one pixel N _b number of blue primary color light sources, prompts the maximum value of the tristimulus values of the selected blue virtual primaries, X ^m _ob therein _(j), Y ^m _ob (j) and Z
^m _ob (j) is the maximum value of the tristimulus values of the blue primary color used for the j-th color monitor. 7. The method according to claim 6 , wherein the ratio between the maximum luminances of the virtual primary colors is adjusted by the white balance. 8. A primary color and a virtual color in a three- primary color monitor.
The relationship with the primary colors is In _{^{and, X t oα (n, j}} ), Y t oα (n, j) and Z
^to _α (n, j) is all tristimulus values of the α primary color at the j-th pixel of the n-th screen frame, α is one of red, green or blue, and X _vα (N, j), Y _vα (n, j) and Z _vα (n,
j) is the tristimulus value of the α-color virtual primary color at the j-th pixel of the n-th screen frame, α is one of red, green, or blue, and is the light source modulation signal and the input video signal. The relation of And S _r (n, j), S _g (n, j) and S _b (n, j)
j) is obtained, and S _r (n, j), S _g (n, j) and S _b (n, j) are red and green at the j-th pixel of the n-th screen frame of the color monitor, respectively. And a blue input video signal,
C _αβ (j) is related to the conversion coefficient at the j-th pixel of the color monitor.
7. A method for compensating for non-uniformity of display of primary colors on the color monitor according to item 6 . 9. A primary color in a color monitor having four or more primary colors
The relationship with the virtual primary color is , And the case where the input video signal is not simply the red, only green and blue three-color signal to separate the specific gravity or input video signals of each primary _{^{color, X t oα (n, j}} ), Y t oα (n, j ) and _{^Z t} ^oα
(N, j) are all tristimulus values of the α-color primary color at the j-th pixel of the n-th screen frame of the color monitor, where α is among red , yellow-green , green and blue. One is shown as X _vα (n, j), Y _vα (n, j) and Z _vα (n,
j) are all tristimulus values of the α-color virtual primary color in the j-th pixel of the n-th screen frame, and α in them is the primary
It is one of the colors , and the relationship between the light source modulation signal and the input video signal is And a _α (n, j) is obtained, and S ^m _β (n, j)
Is the input video signal of the β primary color at the j-th pixel of the n-th screen frame of the color monitor, and when converting the input video signals of red, green and blue, S ^m _β (n,
j) is a video signal, β represents red, green, or blue, and when converting a video signal of four or more colors, S ^m _β
(N, j) is an input video signal corresponding to each primary color separated by a red , yellow-green , green or blue input video signal, β is one of them, and C ^m _αβ (j) is a color 7. The method for compensating non-uniformity of display of primary colors on a color monitor according to claim 6, wherein the conversion coefficient is at the j-th pixel of the monitor. 10. stores conversion coefficients into a memory, and download the stored transformed coefficients in the arithmetic logic circuit, and wherein the conversion of the input video signal to the light source modulation signal by the arithmetic logic circuit, to claim 8 A method for compensating for the non-uniformity of the display of the primary colors of the described color monitor.