JPH11178015A - Self-luminous color display color adjustment system - Google Patents

Abstract

(57) [Summary] An object of the present invention is to provide a system that easily realizes appropriate color balance adjustment according to an observation environment in color balance adjustment of a self-luminous color display. A color adjustment system for a self-luminous color display that reproduces a multicolor image by adjusting the luminous intensity of each of at least three primary colors generates a plurality of color graphic data having different mixing ratios of primary color signals. Means, means for displaying color graphic data, means for selecting / designating one or a plurality of arbitrary color graphics from the color graphics displayed on the display means, and means provided for the selected / designated color graphics. A self-luminous color display color adjustment system, comprising: means for reading color / graphic data of a primary color signal, and means for adjusting the emission intensity balance of each primary color signal based on the read graphic data. is there.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color adjusting system for a self-luminous color display that reproduces a multicolor image by adjusting the luminous intensity of at least three primary colors.

[0002]

2. Description of the Related Art As a self-luminous color display for displaying an image, for example, a so-called color CRT or a backlight for reproducing a natural color image by emitting light from R (red), G (green), and B (blue) phosphors. Color liquid crystal displays (LCDs), R, G, B LEDs, PDPs, and the like are known. Each of these displays reproduces many colors by so-called additive color mixing by adjusting the emission intensity of each primary color of R, G, and B. Each color is determined by the mixing ratio of the signal (input data) given to each primary color. If the actual emission intensity balance of each primary color of the display with respect to the input data is disturbed, the color reproduced on the display is The balance is lost, and color adjustment work is required to reproduce correct colors. Even if the luminous intensity of each primary color with respect to the input data is balanced in a standard environment, if the color temperature of the illumination light in the observation environment is different from the standard environment, the visual system will The same problem as in the case where the light emission intensity balance is relatively lost due to the adaptation to light occurs, and a color adjustment operation of the display is required.

The color balance of a display in the present invention is not determined only by the display, but is based on whether the evaluator perceives a correct color, for example, whether "white" is perceived as "white". . As a system for adjusting the color of the display, for example, a calibration system for the display can be mentioned. In the conventional calibration system, two methods are used. As one method, a color for predetermined reference data is displayed on a display, and the color or the emission intensity is measured by a measuring device, and input is performed so as to eliminate the deviation from the reference value. It adjusts the light emission level (such as electron beam) of the display with respect to the data. The other is to detect the cathode current of each primary color in the display and make a correction to keep the value constant. That is, if the same input data is given to the two methods, a color showing the same measured value is always reproduced. Further, as a system for adjusting a perceptual change in color due to a change in color temperature of ambient light, a system that controls a light emission level of a display by the color temperature of environment light is used.

[0004]

However, in the calibration system used for color adjustment of the display, for example, a color measuring device for the display is required, or a dedicated feedback system and a correction circuit are built in the display. Had to be. Further, in these systems, it is necessary to take measures in advance for all the measurement values for various states of the input data. Further, since the calibration is performed irrespective of the change in the ambient light, it is not possible to cope with the change in the appearance of the display color due to the adaptation of the operator. In color adjustment of a display by a system that controls the balance of each primary color signal based on the color temperature of ambient light, it is necessary to accurately grasp the relationship between an appropriate adjustment value and the color temperature of ambient light. Alternatively, it is necessary to prepare all the data of the light emission intensity balance in which the colors are balanced according to various environmental lights. This system adjusts the color balance of the display based on the adaptation point of the visual system to the color temperature of the ambient light, but it has been difficult for the operator to find the correct adaptation point. Further, the adaptation point itself may be different for each operator, and it is not possible to fix the adaptation point corresponding to the environmental light just because the environmental light is set.

SUMMARY OF THE INVENTION An object of the present invention is to provide a system that easily realizes appropriate adjustment of a color balance according to an observation environment in adjusting a color balance of a self-luminous color display.

[0006]

In order to achieve the above object, a self-luminous color display color adjustment system according to the present invention adjusts the luminous intensity of each of at least three primary colors to reproduce a multicolor image. In a color adjustment system of a light emitting type color display, a means for generating a plurality of color graphic data having different mixing ratios of primary color signals, a means for displaying color graphic data, and a single color graphic from among the color graphics displayed on the display means. A means for selecting / designating a plurality of arbitrary color figures; a means for reading color figure data of a primary color signal given to the selected / designated color figure; and a means for selecting each primary color based on the read figure data. Means for adjusting a light emission intensity balance of a signal. In other words, the emission intensity balance of each primary color signal is adjusted so that the ratio of the read data becomes data that should be originally achromatic (for example, input data of each primary color is equal (R = G = B)). Things.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a color adjusting system for a self-luminous color display according to the present invention. FIG. 2 shows an example in which the self-luminous color display color adjustment system according to the present invention is incorporated in a VDT, and is composed of a display 10 for adjusting color balance, a control computer 11, and a pointing device 12 such as a mouse. . The control computer 11 includes a color graphic data generating unit 111, a data reading unit 112,
The correction amount calculation means 102 and the color balance adjustment means 113 are incorporated. The method of adjusting the color balance in this embodiment is as follows. First, the data value specified by the pointing device 12 is read by the data reading unit 112, the color adjustment amount of the read data is calculated by the correction calculation unit 113, and the display unit is used. By controlling the color balance adjusting unit 113 to be sent to the display 10, an appropriate color tone can be obtained in the self-luminous color display.

FIG. 3 shows an example of an embodiment in which the self-luminous color display color adjustment system according to the present invention is incorporated in the display itself. In this case, the color graphic data generating means 111 and the correction amount calculating means 1 are provided in the display.
02, which functions as the color balance adjusting means 113 with the signal control means 103 incorporated therein. Further, dedicated instruction means 120 are attached, and these are pointing devices, for example, a touch panel. First, the color graphic data generated by the color graphic data generating means 111 is displayed on the display unit 100, and the operator perceives the color graphic data perceived as an achromatic color by the instruction means 120. The correction amount is calculated by the correction amount calculation means 102 from the data given to the designated color figure, the light emission characteristic for the signal input from the signal input unit 104 is corrected by the signal control means 103, and the display unit 100 By sending, the color balance can be adjusted and an appropriate color tone can be obtained.

FIG. 4 shows an example in which the self-luminous color display color adjustment system according to the present invention is applied to an arbitrary color image display system, and input data originally supplied to the display is supplied via this system. By doing so, the color balance can be adjusted and an appropriate color tone can be obtained. By using this system in this way,
The color of home television and video games can be appropriately corrected.

Next, a specific method of adjusting the color balance will be described. FIG. 1 is a flowchart showing a flow of color adjustment by the self-luminous color display color adjustment system according to the present invention. The flowchart of FIG. 1 shows the flow of color adjustment of one to several pieces of color graphic data generated by the color graphic data generating unit 111.

Step 101 First, the color / graphic data generating means 111 generates data of "color", "shape" and "display position" given by the input mixing ratio of each primary color and sends it to the display means. Step 102 Next, the display means displays the color graphic data generated by the color graphic data generating means 111. Step 103 Next, "colorless", that is, a figure of a color in which no color is felt is searched for and designated from the color figure data displayed on the display means. If the color graphic of “achromatic color” is displayed on the display means, the process proceeds to step 104, and if not, the process proceeds to step 101. This is because, in the example of the present embodiment, one to several color figures are displayed on the display means, and "achromatic color" may not be found in one display. Then, when the process proceeds to step 101, the “color” data is changed and the above process is repeated. If “achromatic color” cannot be found, the above processing is repeated until “achromatic color” is found.

Step 104 Next, data of "color" of the designated "achromatic color" is read. That is, the input data of each primary color given to the designated figure is read. Step 105 Next, the correction amount is set by the correction amount calculation means 102 from the read input data of each primary color, and this processing step ends. Then, by applying this correction amount to the screen display input data, a color figure in which the color balance is adjusted can be obtained.

Next, an example of how to calculate the correction amount will be described. For example, each of 8 bits of R, G, and B (2 of 0 to 255)
A case will be described in which the system according to the present invention is applied to a display that controls reproduced colors at (56 gradations). In this system, a figure having the same data (gradation value) given to each of R, G, and B is the color to be rendered achromatic. However, color shift may occur due to the effect of the set color balance and surrounding environment,
Even if the gradation values of R, G, and B are the same, an achromatic color does not appear, and a deviation from the balance is perceived as an achromatic color. It is assumed that the relationship between the input data (here, R, G, and B gradation values) and the output signal (for example, an electron beam current) is as shown in FIG. For example, (R, G, B) = (255, 230, 220) of the color graphic generated by the color graphic data generating unit 111
Is designated as an achromatic color, the output signals whose color balance is appropriate are (255i, 230i,
20i). In order to correct this display, two main approaches can be used in the present system.

First, by controlling the characteristics of the output signal with respect to the input data to the display, the correction can be performed without wasting the data resolution and reducing the number of colors. Then, if there is a margin in the variable width of the output signal, the correction can be performed based on an arbitrary primary color signal. For example,
On the basis of the G signal, (R, G, B) = (230, 2
30, 230), (250i, 230i, 220
The correction can be made by obtaining i). That is, the correction can be performed using the mathematical expression described in Expression 1. However, when using R and B other than G as a reference, it is natural that the correction is performed using a new mathematical expression. FIG. 6 shows the result corrected by the equation (1).

[0015]

(Equation 1)

If the characteristics of the display itself cannot be controlled, the input data itself is corrected so that a ratio output of (255i, 230i, 220i) is obtained when the R, G, and B gradation values are equal. Is corrected. That is, when (R, G, B) = (255, 255, 255), the correction is performed by using Expression 2 so that (R, G, B) = (255, 230, 220). Can be. FIG. 7 shows the result corrected by the equation (2).

[0017]

(Equation 2)

In the above two embodiments, the input data is R,
An example in which control is performed with 8 bits for each of G and B has been described. For example, if the self-luminous color display color adjustment system according to the present invention is applied to a home television display, signals used for display are I and Q. It can be handled by converting it to a signal. Further, the relationship between the I and Q color signals and the respective primary color signals R, G and B in the NTSC system can be obtained by Expression 3. In the NTSC system, when both I and Q obtained by Expression 3 are 0, the color should be originally achromatic. That is, R, G, B = 1:
1: 1.

[0019]

(Equation 3)

In an NTSC display,
R, G, B primary color signals and their color values (XYZ in this example)
The relationship described in Equation 4 holds true for the tristimulus values.

[0021]

(Equation 4)

Further, the color of the graphic used for the correction chart can be determined based on this color value (tristimulus value in the present embodiment). Furthermore, from these tristimulus values, the CIE
LAB value or u'v 'color value (CIE 1976 U
CS chromaticity) or the like, and a target color value for R, G, B data can be obtained based on the calculated values.
Note that the arrangement of the graphics to be displayed is arbitrary, but if a single color is to be displayed, it is desirable that the graphics be displayed in the center of the screen. The shape of the figure can be arbitrarily set, such as a circle, a triangle, a star, or a bird (for example, a seagull or a pigeon).

[0023]

As described above, according to the self-luminous color display color adjustment system according to the present invention, when an image is displayed on the display, the color is perceived as achromatic under any observation environment. Since the color balance can be corrected using the color data to be obtained, appropriate color adjustment according to the environment can be easily and reliably performed in any environment.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a flow of color adjustment by a self-luminous color display color adjustment system according to the present invention.

FIG. 2 is a simplified schematic diagram when a self-luminous color display color adjustment system according to the present invention is incorporated in a VDT.

FIG. 3 is a simplified schematic diagram in a case where a self-luminous color display color adjustment system according to the present invention is incorporated in a display.

FIG. 4 is a simplified schematic diagram when the self-luminous color display color adjustment system according to the present invention is incorporated in a color image display system.

FIG. 5 is a characteristic diagram showing an original input / output characteristic of a display.

FIG. 6 is a characteristic diagram showing input / output characteristics when an output signal is corrected for input data.

FIG. 7 is a characteristic diagram showing input / output characteristics when “input data itself is corrected”.

[Explanation of symbols]

 Reference Signs List 10 Display 11 Control computer 12 Pointing device 100 Display unit 102 Correction amount calculation unit 103 Signal control unit 104 Signal input unit 111 Color graphic data generation unit 112 Data Readout means 113 ... Color balance adjustment means 120 ... Instruction means

Claims (1)

[Claims] 1. A color adjustment system for a self-luminous color display that reproduces a multicolor image by adjusting the emission intensity of each of at least three primary colors, wherein a plurality of color graphic data having different mixing ratios of primary color signals are generated. Means for displaying the color figure data, and selecting / selecting one or more arbitrary color figures from the color figures displayed on the display means.
Selecting / designating means for designating, means for reading data of primary color signals given to the selected / designated color figure, and means for adjusting the emission intensity balance of each primary color signal based on the read data. And a color adjustment system for a self-luminous color display.