JP2006221028A - Image display method, image display processing program, and image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image display method which is appropriate for a display device of a slow response speed due to making of a signal change applied to the display device small, and reduces color breakup, an image display processing program, and an image display device. <P>SOLUTION: The display method has a first step (S1) of lining up N colors (N is 3 or more integers) of reference colors as color sequences with a certain reference color among the N colors of the reference colors as an origin on a chromaticity diagram, so as to minimize the distance at the time of returning to the reference color which is the origin by once each passing the reference color other than the reference color which is the origin, a second step (S2) of setting the additive complementary colors for the N colors of the reference colors lined up as the color sequences, and third steps (S3 to S9) selecting the additive complementary color most approximate to the adjacent two reference colors of the N colors of the reference colors lined up as the color sequences from among the additive complementary colors set by the second step and putting the additive complementary colors as the color sequences between the adjacent two reference colors, thereby alternately lining up the individual reference colors of the N colors of the reference colors and the individual color sequences of the N colors of the reference colors and setting the same as the color sequences for the color sequential display. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an image display method for performing color sequential display, an image display processing program, and an image display apparatus.

  A normal color image is expressed as a set of several color components. Specifically, it is expressed using red (R), green (G), blue (B) as reference colors, cyan (C), magenta (M), yellow (Y), etc. which are complementary colors. There are many cases. Of course, the color components used here are not limited to these, and white (W) and some intermediate colors may be used. What color is used can be described using a chromaticity diagram.

  FIG. 15 is a diagram schematically showing a chromaticity diagram (referred to as an xy chromaticity diagram). Black circles and white circles with letters in the figure indicate the positions of the RGB, CMY, and W. In FIG. 15, for example, a color obtained by additively mixing R and G is shown as a point on a straight line connecting the point R and the point G in FIG. That is, the color of the color image that can be expressed using the N color components is limited to the inside of the largest convex body that can be formed by connecting the N colors on the xy chromaticity diagram.

  Therefore, if a color positioned at the apex of the convex body including the color to be displayed is selected as a color component, a desired color can be obtained as an additive color mixture thereof. For example, as is apparent from the RGB triangle in FIG. 15, most of the xy chromaticity diagram can be expressed by only the three colors of RGB.

  Now, as a method of displaying a color image composed of a plurality of color components appropriately selected in this way, a method of displaying all of them simultaneously, and displaying them by time division (referred to as color sequential display) There is a way to do it.

  The method of displaying all colors at the same time is considered to allow more natural display, but there is a problem that a more complicated and large-sized device is required for that purpose. On the other hand, since the color sequential display requires only one electro-optic modulation device as a display device, a simpler and smaller display device can be realized.

  This color image display by color sequential uses the fact that human vision has an integral characteristic having a time constant of about several tens of milliseconds. In other words, at this time, images that are sequentially displayed within a constant time are not recognized as individual ones but are used as recognized as a mixture of colors.

  For example, when each RGB single color image is continuously displayed at a time interval of about several milliseconds, they are recognized not as three individual images but as a single color image composed of mixed RGB components. Will be.

  However, in order to obtain an accurate color image in this way, in addition to a sufficiently short display time interval, each monochrome image needs to be accurately superimposed on the retina. However, for example, this condition is not satisfied when the line of sight moves suddenly. At this time, the monochromatic images do not overlap accurately on the retina, and an image different from the expected color mixture is perceived. In particular, in the vicinity of a region where the color change is steep, this influence is large, and an unintended false color can be seen there. This is a phenomenon called color breakup, which causes a significant deterioration in image quality.

  FIG. 16 is a diagram for explaining the phenomenon of color breakup. In order to simplify the explanation, a one-dimensional display is considered here. In FIG. 16A, the vertical axis indicates the passage of time, and the horizontal axis indicates the display position of the one-dimensional display. An upward arrow on the horizontal axis indicates the luminance of a certain color on the straight line.

  For example, it is assumed that the white area moves from the left to the right in FIG. Of course, the line of sight follows it and moves smoothly from left to right. In FIG. 16A, a thick line arrow “a” obliquely downward indicates a movement of the line of sight. On the other hand, in color sequential display, each monochrome image in one frame is displayed at the same position at a certain time interval.

  In FIG. 16A, the color components are RGB, and the nth frame, the (n + 1) th frame, and the (n + 2) th frame are schematically drawn with 3 color components. In this case, as shown in FIG. 16B, the image on the retina is overlapped with G shifted to the left of R and B shifted to the left. In other words, the RGB image that should have been whitened by being separated is separated, and other colors can be seen before and after the white area. This is color breakup.

  Since this is a serious image quality deterioration factor, various measures have been taken conventionally. For example, Patent Document 1 (Japanese Patent Laid-Open No. 2002-229531) discloses a method using W in addition to RGB. As is clear from the above description, color breakup is most perceived when the brightness of each color is high. That is, a color such as white is most problematic.

  As shown in FIG. 13 of the drawing attached to the specification of Patent Document 1, Patent Document 1 uses white (W) in addition to RGB as a color sequential color component, a color image W, It is expressed as RGB to be added. Thereby, it is possible to relatively reduce the luminance in the case of each single color of RGB and make it difficult to see the color breakup.

This will be specifically described below. For example, the RGB component signal of the color to be displayed is represented by (r, g, b). A minimum value function that returns a minimum value among several values, Vi (i is 1 to n) is represented by min (V1, V2,..., Vn). If it does so, in patent documents 1, the signal given to each color section will be given by the following (1) formula.
R section: r-min (r, g, b)
G section: g-min (r, g, b)
B section: b-min (r, g, b)
W section: min (r, g, b) (1)
At this time, if the value of min (r, g, b) is large, it is possible to reduce the luminance of each RGB section where the color breakup is noticeable, and to make it difficult to see the color breakup. However, if the value of min (r, g, b) is small at the same time, it is clear that the effect is small.

  As another example, there is a method disclosed in Patent Document 2 (Japanese Patent Laid-Open No. 2003-280614). Patent Document 2 is an improvement over Patent Document 1.

Patent Document 2 uses, for example, a six-color system in which RGB and its complementary color CMY are added, as shown in FIG. 6 of the drawing attached to the specification of Patent Document 2. One frame is composed of six subframes, and a signal is distributed to each subframe by a method described in paragraph “0010” in the specification of Patent Document 2. This signal distribution method is simply shown in the following (a) to (e).
(A) Extract achromatic component min (r, g, b).
(B) Y, M, and C are extracted from the signal obtained by subtracting the achromatic component. For example, for C, C = min (g, b) −min (r, g, b).
(C) 2/9 of the achromatic component is assigned to each of the Y, M, and C subframes.
(D) Y, M, and C obtained in (b) are assigned to each of Y, M, and C subframes.
(E) Distributing insufficient luminance signals in each of the R, G, and B sections.

In summary, the signal of each section is given by the following equation (2).
Section C: min (g, b) -7 / 9 × min (r, g, b)
M section: min (r, b) -7 / 9 × min (r, g, b)
Y section: min (r, g) -7 / 9 × min (r, g, b)
R section: r-MY
G section: g-C-Y
B section: bCM (2)
In Patent Document 2, since one frame is composed of six subframes, there is an effect that the width of color breakup is narrowed. In addition, as shown in FIG. 6 of the drawing attached to the specification of Patent Document 2, the color sequential order is set so that a certain color and its complementary color are arranged in time. Thereby, even if color breakup occurs, they are arranged spatially close, and if they are mixed, it becomes difficult to see the color breakup.

  Further, in Patent Document 2, the color sequence is set with 2 frames as one unit, and the complementary color is arranged at the same subframe position of the previous frame and the next frame. For this reason, in addition to the spatial color mixing described above, it is possible to make it difficult to see the color breakup by temporal color mixing.

Japanese Patent Application Laid-Open No. 2002-229531 JP 2003-280614 A

  Although Patent Document 1 can expect a predetermined effect by a simple method, there is a problem that there is no effect for a specific color as described above. For example, when RGB is used as the three basic color components and W is used as the fourth color, Patent Document 1 has no effect on CMY which is a complementary color of RGB. That is, in these, min (r, g, b) described above is 0. Further, even if a color other than W is selected as the fourth color, there is a problem that the effect is not sufficient for a specific color.

  Patent Document 2 solves such a problem, and appropriately assigns values to six colors of RGB and CMY, and arranges them as described above. However, there is a problem that six subframes are necessary as a compensation, and a display element that responds at high speed is necessary in order to cope with it.

  This will be described with reference to the xy chromaticity diagram of FIG. First, a light source for realizing six colors will be described. RGB and CMY in FIG. 15 indicate the positions of the respective colors on the xy chromaticity diagram. From FIG. 15, it can be seen that C in the middle of G and B is expressed by a mixed color of G and B. Similarly, Y is expressed by a mixed color of R and G, and M is a mixed color of R and B. As is clear from this, CMY is obtained by simultaneously lighting G and B, R and B, and R and G, so a CMY single-color light source is unnecessary.

  FIG. 17 is a diagram schematically showing the relative positional relationship between RGB and CMY on the xy chromaticity shown in FIG. 15 and showing the color order described in Embodiment 2 of Patent Document 2. . In FIG. 17, the numbers in the white circles indicate the color order. As is clear from FIG. 17, the color sequence of Patent Document 2 repeats a large movement on the xy chromaticity diagram in order to arrange RGB complementary colors temporally in adjacent RGB portions within the same frame.

FIG. 18 is a time chart in which the color change in FIG. 17 is expressed by a combination of RGB. In FIG. 18, the horizontal axis indicates time, and the vertical axis schematically indicates ON / OFF of the light emitting means for each color of RGB.
As is clear from FIG. 18, the shortest lighting section of each color of RGB in Patent Document 2 is one subframe section, that is, 1/6 frame section. This indicates that a display device that can be used in this color sequential display must be able to sufficiently follow the time of this one subframe.

  FIG. 19 is a diagram for explaining the correspondence between the response speed of the display device and the signal change. In FIG. 19A, the time constant of the response of the display device is smaller than the shortest lighting section (the response speed is fast), and the display operation (shown by the solid line in the figure) follows the signal change (shown by the broken line in the figure). Indicates the state. On the other hand, FIG. 19B shows a state where the time constant of response of the display device is larger than the shortest lighting section (response speed is slow) and the display operation cannot follow the signal change.

  In the state as shown in FIG. 19B, it is clear that accurate display is impossible. In Patent Document 2, since the shortest lighting section is 1/6 frame section, there is a problem that a display device having a high response speed corresponding to the shortest lighting section is required. Here, as an example, consider an example of displaying cyan (C).

  FIG. 20 shows the lighting timing of the RGB light source when displaying cyan (C) in Patent Document 2 and the magnitude of a signal given to an electro-optic modulation device as a display device. As apparent from FIG. 20, in this example, there is a portion where the signal applied to the electro-optic modulation device changes in units of 1/6 frame.

  On the other hand, FIG. 21 is a diagram for explaining the color order of Patent Document 1 on the xy chromaticity shown in FIG. 15 and corresponds to FIG. 17 used in the description of the color order of Patent Document 2. Since Patent Document 1 uses RGB and W, the color order on the xy chromaticity diagram is the order shown by the numbers in the white circles in FIG.

  FIG. 22 is a time chart in which the color change in FIG. 21 is expressed by a combination of RGB, and this is a diagram corresponding to FIG. 18 used in the description of Patent Document 2. As is apparent from FIG. 22, even in Patent Document 2, the shortest lighting section is one subframe, which is ¼ frame.

  FIG. 23 shows a case where cyan (C) is displayed in Patent Document 1. As is clear from FIG. 23, in Patent Document 1, the change in the signal for displaying cyan may be ½ frame. In other words, in the case of Patent Document 1, it is possible to use an electro-optic modulation device that is relatively slow in response to cyan.

  To summarize the above, the shortest lighting section in Patent Document 2 is 1/6 frame, which is shorter than the 1/4 frame of Patent Document 1. Although this does not directly correspond to the response speed on a one-to-one basis, it requires a display device with a faster response. Further, the color order in Patent Document 2 is a complementary color of RGB in adjacent portions of RGB in the same frame. Therefore, there is a problem that a large movement must be repeated on the xy chromaticity diagram as shown in FIG.

  Therefore, the present invention makes it possible to realize a color image display method by a color sequential method that is also suitable for a display element having a relatively slow output response, and improves the display accuracy and the color that appears when the line of sight moves in the color sequential method. An object of the present invention is to realize an image display method, an image display processing program, and an image display device capable of reducing cracks.

(1) The image display method of the present invention is an image display method for performing color sequential display using N colors (N is an integer of 3 or more) reference colors and their complementary colors on the chromaticity diagram, In the figure, the distance from the reference color of the N reference colors as a starting point through the reference colors except the reference color as the starting point and returning to the starting reference color is minimized. A first step of arranging the N reference colors in a color order; a second step of setting N complementary colors for the N reference colors arranged in the color order; and the second step. A complementary color closest to two adjacent reference colors among the N reference colors arranged as the color order is selected from the set complementary colors, and the adjacent two colors are selected using the selected complementary color as a color order. By placing between the two reference colors, the N color reference And having a third step of setting as a color order for each of the reference color and the N color and individual complementary color of the complementary color side by side alternately color sequential display of the.
In the color order set by the image display method of the present invention, more highly correlated colors are continuous. By performing color sequential display according to such a color order, a change in a signal applied to the display device is reduced. Therefore, even when a display device having a relatively slow response speed is used, it is possible to perform display with relatively high accuracy.

(2) In the image display method according to (1), the process of selecting a complementary color closest to the two adjacent reference colors is performed by performing the second step from each reference color of the two adjacent reference colors. It is preferable that the sum of the distances to the N complementary colors set by the above is obtained, and the complementary color having the smallest sum of the obtained distances is set as the complementary color closest to the two adjacent reference colors.
Thereby, a complementary color to be inserted as a color order between two adjacent reference colors can be determined by a simple calculation.

(3) In the image display method according to (1) or (2), the chromaticity diagram is preferably an xy chromaticity diagram.
As described above, by using the xy chromaticity diagram as the chromaticity diagram, the color order can be easily set.

(4) In the image display method according to (1), one frame of image data to be displayed is composed of 2N subframes, and each of the N reference colors and the N complementary colors is used. It is preferable that the reference color and the complementary color correspond to each subframe of the 2N subframes in the color order or vice versa.
In this way, by configuring one frame with 2N sub-frames, even if color breakup occurs, the width can be reduced and the color breakup can be made difficult to be visually recognized.

(5) In the image display method according to (4), two consecutive frames of the image data are defined as one unit, and a subframe corresponding to each of the two consecutive frames includes a certain reference color and its reference color. It is preferable that a complementary color is associated.
In this way, in a subframe corresponding to each of two consecutive frames, the color order is such that a certain reference color and its complementary color are associated with each other, so that an effect of making it difficult to see color breakup due to temporal color mixture is obtained. It is done.

(6) In the image display method described in the above (4) or (5), it is preferable to change the color order in units of frames of the image data based on encryption data.
In this way, even if the image data is intercepted by a malicious user at the connecting portion between the image data output device that outputs the image data to be displayed on the image display device and the image display device, for example, by changing the color order. Thus, the effect of making unauthorized use of the image data difficult can be obtained.

(7) In the image display method according to (6), it is preferable that the encryption data is data that rotates the color order and / or data that reverses the color order.
Thereby, it is possible to change the starting color and the color in the rotational direction of the color order while maintaining the color order for the color sequential display obtained in (1).

(8) In the image display method according to any one of (1) to (6), the N reference colors are red (R), green (G), and blue (B), and the complementary colors Is preferably cyan (C), magenta (M), yellow (Y).
RGB as a reference color is generally used, and CMY as a complementary color of RGB is also a commonly used color component. Therefore, by using these as a reference color and its complementary color, a general-purpose image display apparatus can be used. The image display method of the invention can be easily applied.

(9) In the image display method according to (8), one frame of image data to be displayed is composed of six subframes, and each of the RGB reference colors and CMY complementary colors is used as the six subframes. The sub-frames of R, G, B, R, G, B, G, B, G, B, G, B, G, B, G, B, G, B, G, B, G, B, G, B, G, B, C , CBMRYG, BMRYGC, MRYGCB, RMBCGY, MBCGYR, BCGYRM, CGYRMB, GYRMBC, and YRMMBCG.
In these color orders, more highly correlated colors are continuous. By performing color sequential display based on such color orders, changes in the signal given to the display device can be reduced, and the response is relatively high. Even when a display device with a low speed is used, it is possible to perform display with relatively high accuracy.

(10) An image display processing program of the present invention is an image display processing program for performing color sequential display using a reference color of N colors (N is an integer of 3 or more) on the chromaticity diagram and its complementary color, In the chromaticity diagram, the distance from the reference color of the N reference colors as a starting point to the starting reference color after passing through the reference colors excluding the starting reference color is minimized. In this way, the first step of arranging the N reference colors in the color order, the second step of setting N complementary colors for the N reference colors arranged in the color order, and the second step The complementary color closest to two adjacent reference colors among the N reference colors arranged as the color order is selected from the complementary colors set in the step, and the adjacent colors are selected as the color order. Inserted between the two reference colors To execute the third step of alternately arranging the individual reference colors of the N reference colors and the complementary colors of the N complementary colors to set the color order for color sequential display. It is possible.
The effect similar to the effect described in the image display method (1) can be obtained by this image display processing program. Note that this image display processing program preferably has the same characteristics as the image display methods (2) to (9).

(11) An image display device of the present invention is an image display device that performs color sequential display using N colors (N is an integer of 3 or more) reference colors and their complementary colors on a chromaticity diagram, The color sequential display using the color order for the color sequential display created by the image display method described in (1) is performed.
Also with this image display device, the same effect as that described in the image display method (1) can be obtained. Note that this image display device preferably has the same characteristics as the image display methods (2) to (9).

Hereinafter, the present invention will be described in detail with reference to the drawings.
[Embodiment 1]
FIG. 1 is a diagram showing a configuration of an image display apparatus according to Embodiment 1 of the present invention. An image display device 101 according to the first embodiment includes an image data input unit 1, a color component separation unit 2, a timing generation unit 3, a light source control unit 4, a color component selection / synthesis unit 5, a light emitting device 6 as a light source, and a display device. The electro-optic modulation device 7 is provided.

FIG. 2 is a diagram showing a configuration when the image display apparatus 101 shown in FIG. 1 is a projection display apparatus such as a projector. In each embodiment of the present invention, a case will be described in which the color component as a reference color is RGB, and a transmissive liquid crystal display device is used as the electro-optic modulation device 7 as a display device. 2, the same components as those in FIG. 1 are denoted by the same reference numerals as those in FIG.
As described above, since the reference color is RGB in each embodiment of the present invention, the light emitting device 6 includes the red light emitting means 6R that emits red (R), the green light emitting means 6G that emits green (G), and blue. Blue light emitting means 6B for emitting (B) is provided. In addition, LED etc. can be used as each of these light emission means. In addition to these, a projection lens 8 and a screen SCR are also provided.

In each embodiment of the present invention, it is assumed that the image data signal input by the image data input unit 1 is output as an rgb signal. Actually, in addition to rgb, color data other than RGB, such as YUV or YPbPr, may be used, but this is not essential in the description of the present invention, and is described here as rgb.
In each embodiment of the present description, the description will be made as a six-color sequential display in which RGB and CMY, which are complementary colors, are added. In addition, RGBCMY for displaying the six colors is generated by the color component decomposition unit 2 as shown in FIG.

In addition, the light source control unit 4 is synchronized with the timing generated by the timing generation unit 3 that operates based on the display time control information included in the image data, and the red light emitting unit 6R, the green light emitting unit 6G, and the blue light emitting unit. 6B is controlled. Thereby, color sequential display for color sequential display of six colors is performed.
The color component selection / synthesis unit 5 controls the electro-optic modulation device 7 by selecting an appropriate signal from RGBCMY in accordance with the timing of the light source control unit 4.

FIG. 3 is a flowchart showing a method for obtaining a color order for color sequential display using N colors (N is an integer of 3 or more) reference colors and their complementary colors on a chromaticity diagram (xy chromaticity diagram). It is. As described above, each embodiment of the present invention is an example of performing six-color sequential display in which RGB and its complementary color CMY are added, but the flowchart of FIG. A processing procedure is shown for an example of obtaining a color order in the case of colors (N is an integer of 3 or more).
In FIG. 3, the color order for color sequential display is obtained by executing steps S1 to S8 (step S9). The color order for the color sequential display is P1, Q1,..., Pi, Qi,..., PN, QN, and this is Zi (i is 1 to 2N).

  The processing in steps S1 to S9 in FIG. 3 is generally performed once on the xy chromaticity diagram, starting from a certain reference color among the N reference colors and passing through the reference colors excluding the reference color that is the starting point. A first step of arranging the N reference colors in the color order so that the distance when returning to the starting reference color is minimized, and N complementary colors for the N reference colors arranged as the color order Selecting a complementary color closest to two adjacent reference colors out of the N reference colors arranged in the color order from the complementary colors set in the second step, By inserting the selected complementary color as a color order between the two adjacent reference colors, the individual reference colors of the N reference colors and the individual complementary colors of the N complementary colors are alternately arranged. The third scan that is set as the color order for side-by-side color sequential display Tsu and flops exist.

Step S1 in FIG. 3 is a process substantially corresponding to the first step. In step S1 in FIG. 3, various functions d (Li, Lj) for obtaining a distance between a certain reference color Li (i is 1 to N) and a certain reference color Lj can be considered. For example, an xy chromaticity diagram Using the coordinates (Xi, Yi) of Li in (see FIG. 15) and the coordinates (Xj, Yj) of Lj on the xy chromaticity diagram,
d (Li, Lj) = (Xi−Xj) ² + (Yi−Yj) ² (3)
Can be used. The reference color arranged as the color order in step S1 is set as Qi.

  Step S2 in FIG. 3 is a process substantially corresponding to the second step, and the N complementary colors set in step S2 are Hi (i is 1 to N). This Hi is obtained by approximating ^ Qi by combining any number of Qi, where Qi is the complementary color of Qi.

  Also, steps S3 to S9 in FIG. 3 are processes that substantially correspond to the third step, and steps S3 to S8 of steps S3 to S9 are each of the reference colors Ci arranged in step S1. In this processing, the closest complementary color is selected from two adjacent reference colors, and the selected complementary color is inserted as a color order between the two adjacent reference colors. When the closest complementary color is selected from each of the two adjacent reference colors, the distance from the two adjacent color components to any complementary color Hk of the N complementary colors is evaluated.

For the evaluation of this distance, a complementary color that minimizes d (Ci, Hk) + d (Cj, Hk) is selected from N complementary colors, and the selected complementary color is defined as Pi. Insert as a color order between the reference colors.
Then, the selected complementary color is excluded (step S7), I is set to I + 1, and I is set to i to perform the same processing. By performing this until I becomes N, P1, Q1,..., Pi, Qi,..., PN, QN are obtained as the color order Zi for color sequential display in step S9.
Note that the N-th complementary color PN can be made the remaining complementary color PN by performing steps S3 to S8 N-1 times.

  The flowchart of FIG. 3 shows a method for obtaining the color display order for the N reference colors when the reference color is N. Here, as one specific example, N = 3, In addition, a color sequence creation process when the reference color emitted from the light emitting device 6 as a light source is RGB will be briefly described.

  First, N colors Li (i is 1 to N) constituting a color image are determined as reference colors. Then, in the xy chromaticity diagram shown in FIG. 15, the accumulated distance among the lines that start from any one reference color, pass through the remaining (N−1) colors once, and return to the starting color. Select the one that minimizes. Qi (i is 1 to N) is a line in which Li is arranged in the order in which the line segments pass through. In this case, as is clear from this definition, the reverse order is equivalent. Here, since the reference colors are three colors of RGB (N = 3), this order is self-explanatory. For example, if R is the starting point, it is either RGB or RBG.

  Next, ^ Qi which is a complementary color of Qi is obtained. This ^ Qi is approximated by the remainder obtained by removing Qi from Qj (j is 1 to N), and is Hi (i is 1 to N). In this case, since the reference colors are three colors of RGB, Hi is C, M, and Y as is apparent from the xy chromaticity diagram of FIG. C can be expressed as G + B, M as R + B, and Y as R + G.

  Subsequently, a complementary color having a minimum distance from two adjacent reference colors is selected, set as the selected complementary color Pi, and Pi is removed from the set of complementary colors (steps S6 and S7), and the remaining complementary colors are processed. Steps S6 and S7 are repeated. As a result, when the reference color is RGB, Y is determined as a complementary color for R and G, C is determined as a complementary color for G and B, and M is determined as a complementary color for B and R.

It should be noted that Ci and Cj in step S6 are two adjacent reference colors, and these are obtained by (I-1) mod N + 1 when i = I in step S5. In this case, since the reference colors are three colors of RGB (N = 3), i takes any value of I = 1, 2, 3.
Here, in the xy chromaticity diagram of FIG. 15, if R = 1, G = 2, and B = 3, j is 3 = from (1-2) mod3 + 1 when i = 1. This indicates that the two adjacent reference colors Ci and Cj are R and B. Further, when i is I = 2, j is determined as j = 1 from (2-2) mod 3 + 1, which indicates that the two adjacent reference colors Ci and Cj are G and R. Yes. Similarly, when i is I = 3, j is determined as j = 2 from (3-2) mod 3 + 1, which indicates that two adjacent reference colors Ci and Cj are B and G. ing.

  From the above results, in this case, P1, Q1, P2, Q2, P3, and Q3 are obtained as the color display order. Here, Q1, Q2, and Q3 are obtained by rotating an RGB triangle clockwise (or counterclockwise) from an arbitrary reference color on the xy chromaticity diagram of FIG. For example, if Q1 is G and the rotation direction is counterclockwise, Q1, Q2, and Q3 are G, B, and R. Similarly, P1, P2, and P3 are Y, C, and M, where Q1 is G and the rotation direction is counterclockwise, where Y is the starting point. Accordingly, the color order P1, Q1, P2, Q2, P3, Q3 is YGCCBMR on the xy chromaticity diagram shown in FIG.

  As described above, the starting color of this color order may be any of the six colors (YGCCBMR) on the triangle in the xy chromaticity diagram of FIG. 15, and the order is xy of FIG. The order of the triangles in the chromaticity diagram may be either counterclockwise or clockwise.

FIG. 4 is a diagram schematically showing the color order of the first embodiment on the xy chromaticity shown in FIG. 15, which corresponds to FIG. 17 illustrating the color order on the xy chromaticity of Patent Document 2. It is. As is clear from FIG. 4, the first embodiment performs a very simple movement on the xy chromaticity diagram as compared with Patent Document 2. At this time, the signal value assigned to each color section is expressed by the following equation (4).
Section C: 1/2 x min (g, b) -1/6 x min (r, g, b)
M section: 1/2 × min (r, b) −1 / 6 × min (r, g, b)
Y section: 1/2 × min (r, g) -1 / 6 × min (r, g, b
R section: r-MY
G section: g-C-Y
B section: bCM (4)
This is because two of the achromatic signal, that is, the condition that the signals in each section are equal when the values of r, g, b are equal and the complementary color section, that is, the values of r, g, b, are the same value, and one is When it is 0, it is obtained under the condition that the signals are equal in half of all the intervals.

  FIG. 5 is a time chart in which the color change shown in FIG. 4 is expressed by a combination of RGB, and this corresponds to FIG. As shown in FIG. 5, in the first embodiment, one frame is composed of six subframes. The point that one frame is composed of six subframes is the same as that in Patent Document 2, but the color order of each frame in the first embodiment is YGCBMR.

  As can be seen from FIG. 5, in the first embodiment, it can be understood that the shortest lighting section is 3 subframes, that is, 1/2 frame. This is longer than the 1/4 frame of Patent Document 1 as well as the 1/6 frame of Patent Document 2, and further longer than the 1/3 frame of the simple RGB three-color system.

  Thereby, when using a display device with a slow response speed such as liquid crystal, it is advantageous to perform the color display order of the first embodiment. This is because the signal change applied to the display device that performs color sequential display can be reduced by adopting such a color display order.

FIG. 6 is a flowchart showing the color sequential display processing procedure of the first embodiment using the color order created in FIG.
In FIG. 6, the process of step S11 is the color order creation process of FIG. 3, and it is assumed that a certain color order is created by this color order creation process. Next, it is determined whether or not the display is finished (step S12). If the display is finished, the process is finished. If the display is not finished, an image data input process is performed (step S13).

  Then, color separation processing of N colors is performed from the input image data (step S14), i is set to 1, and it is determined whether i> i> 2N (steps S15 and S16). If i> 2N, the process returns to step S12. If i> 2N, the display corresponding to Zi is synthesized, and the light source (light emitting means) corresponding to Zi is turned on (step S17).

  Subsequently, i is set to i + 1 (step S18), and the process returns to step S16. Steps S17 and S18 are performed until i = 2N (2N = 6 since N = 3 in the first embodiment). Thereby, the display sequence in a certain frame (for example, n frame in FIG. 5) is Z1, Z2, Z3, Z4, Z5, and Z6.

  In this way, when the processing of one frame is completed, that is, when i> 2N, the same processing is performed for the next frame. In the first embodiment, the display sequence in the next frame (for example, the n + 1 frame in FIG. 5) is also Z1, Z2, Z3, Z4, Z5, and Z6.

FIG. 7 shows lighting timings of RGB light sources (red, green, and blue light emitting means 6R, 6G, and 6B) for displaying cyan (C) and signals to be supplied to the electro-optic modulation device 7 in the first embodiment. Is. As is clear from FIG. 7, in the first embodiment, one frame is composed of 6 subframes as in Patent Document 2, but in Patent Document 2, as described above, 1/6 frame unit. There is a portion where the signal applied to the electro-optic modulation device changes (see FIG. 20). On the other hand, in the first embodiment, it can be seen that the change of the signal applied to the electro-optic modulation device 7 may be equal to that of Patent Document 1 and may be 1/2 frame.
In Patent Document 1, in the case of other complementary colors, for example, magenta (M), signals in the R section and the B section are required, and the signal changes with a period of 1/4 frame. In 1, the display is performed in a continuous section of the BMR, and the signal change of 1/2 frame unit remains.

Such comparison with the prior art (Patent Document 1 and Patent Document 2) is for display of a specific color, but defines an evaluation amount for performing comparison for a general case.
FIG. 8 is a diagram for explaining quantitative evaluation of a change in signal applied to the electro-optic modulation device 7 according to the first embodiment. As shown in FIG. 8, attention is paid to the signal change at the boundary of each subframe. If the average value of the change amount of the signal change is small, it is considered that display with higher accuracy is possible on a display device having a relatively slow response speed.

  Since the above equation (4) includes a minimum value function, it is difficult to show the effect of the present invention as a general equation. Therefore, comparison was made with the prior art (Patent Document 1 and Patent Document 2) for all 1677,216 colors that can be expressed when each RGB color is 8 bits. The experiments conducted are as follows.

(A) One experimental color is generated.
(B) The experimental colors are displayed in color sequence by the method of Patent Document 1, and the sum of absolute values of signal changes given to the electro-optic modulation device as a display device is integrated. This is hereinafter referred to as T1. In Patent Document 1, there are four signal value changes in order to display one frame.
(C) Similarly, this experimental color is displayed in color sequence by the method of Patent Document 2, and the sum of absolute values of signal changes given to the electro-optic modulator as a display device is integrated. This is hereinafter referred to as T2. In Patent Document 2, there are six signal value changes to display one frame.
(D) Similarly, the experimental colors are displayed in color sequence by the method of the first embodiment, and the sum of absolute values of signal changes given to the electro-optic modulation device as the display device is integrated. This is hereinafter referred to as T0. In the case of the first embodiment, there are six signal value changes to display one frame. In any of the above cases, the signal change value is obtained on the assumption that the same color is repeatedly displayed. This is natural for a still image, but also due to the nature of the image that the probability that the same color is continuously displayed at the same display position in a moving image is extremely high.
(E) The above (a) to (d) are performed for all the colors (16,777,216 colors in this experiment), and the average values of T0, T1, and T2 are obtained. The results are shown below.

Sum of absolute values of signal changes T0: 192 in Embodiment 1 (per transition: 32)
Sum of absolute values of signal changes in Patent Document 1 T1: 319 (per transition: 80)
Sum of absolute values of signal changes in Patent Document 2 T2: 274 (per transition: 46)
As described above, the sum T0 of the absolute values of signal changes per frame in the first embodiment is smaller than those in Patent Document 1 and Patent Document 2. Also, the value per transition is smaller than those.

  As can be seen from this experiment, the sum of the absolute values of the signal changes in the first embodiment is smaller than that in the prior art, because the color order in the color sequential display in the first embodiment has a higher correlation. It is considered that the colors are continuous, and as a result, the signal change as an average value becomes small.

  In addition to this, the first embodiment has an effect that the number of times of switching of each light emitting means as a light source is reduced. For example, considering the number of times of switching of the light emitting means 6R, 6G, and 6B for RGB, Patent Document 2 requires two times of switching for each of RGB. On the other hand, in the first embodiment, only one switching is required for each of RGB. In general, a light source consumes a large amount of power, and its switching is a heavy burden on the control element. This is also accompanied by large electromagnetic radiation noise.

In summary, the following effects can be obtained as effects of the first embodiment of the present invention.
(I) Since one frame is composed of six sub-frames, even if color breakup occurs, the width of the frame can be reduced to make it difficult to see.
(Ii) With the same simplicity as in Patent Document 2, the integrated value of signal change can be reduced to about 70% of Patent Document 2. Thereby, the display accuracy in a display device with a slow response speed can be improved.
(Iii) Compared with Patent Document 2, the number of switching times of the light source is 50%. Thereby, for example, when each of the RGB light emitting elements is used, the power loss associated with switching can be halved. At the same time, the frequency of electromagnetic radiation noise is halved to facilitate noise countermeasures.

[Embodiment 2]
Next, Embodiment 2 of the present invention will be described. The image display apparatus according to the second embodiment is the same as that shown in FIG. 1 and can be realized with the configuration. Therefore, the description of the configuration is omitted.

  FIG. 9 is a diagram schematically illustrating the color order of the second embodiment on the xy chromaticity illustrated in FIG. 15, and this corresponds to FIG. 4 of the first embodiment. FIG. 10 is a time chart in which the color change shown in FIG. 9 is expressed by a combination of RGB, and this corresponds to FIG. 5 of the first embodiment.

  In the second embodiment, as is apparent from FIGS. 9 and 10, two frames (for example, the n frame and the n + 1 frame in FIG. 10) are set as one unit, and the first of the two frames is used. As in the first embodiment, YGCCBMR is allocated to 2N subframes constituting the frame (2N = 6 since the reference colors are three colors of RGB in the second embodiment), and the second frame is configured. The BMRYGC is assigned to the 6 subframes. That is, in the second embodiment, a certain reference color and its complementary color are associated with each corresponding subframe of two frames constituting one unit.

  FIG. 11 is a flowchart for explaining the color sequential display operation of the second embodiment. The flowchart in FIG. 11 corresponds to the flowchart for explaining the color sequential display processing operation of the first embodiment shown in FIG. 6, and steps S21 to S24 in FIG. 11 are the same as steps S11 to S14 in FIG. Therefore, the process after step S25 is demonstrated.

  Step S25 in FIG. 11 is a process for determining whether or not the current frame is an odd-numbered frame. In the second embodiment, since two frames are used as one unit, one unit is selected. This is a process of determining whether the frame is the first frame (n frame in FIG. 10) or the second frame (n + 1 frame in FIG. 10) of the two frames.

  As a result of the determination in step S25, for example, when it is determined that the frame is an odd number frame (n frame in FIG. 10), first, i is set to 1 (step S26). Then, it is determined whether or not i> 2N (step S27). If i> 2N, the process returns to step S22. If i is 2N or less, a display corresponding to Zi is synthesized, and Zi A process of turning on the light source corresponding to (step S28) is performed. Then, i is set to i + 1 (step S29), and the process returns to step S27.

That is, if it is determined that the frame is an odd frame (n frame in FIG. 10), i = 1 at first, so if the reference color is three colors of RGB (N = 3), for example, Z1 ( The display corresponding to the first subframe of the six subframes of n frames in FIG. 10 is combined, and the light source corresponding to Z1 is turned on.
Then, assuming that i = 2, this time, a display corresponding to Z2 (second subframe among six subframes of n frames in FIG. 10) is synthesized, and a light source corresponding to Z2 is turned on. Process. Such processing is performed until i = 2N = 6. As a result, the display sequence in the odd frame, that is, the n frame in FIG. 10, is Z1, Z2, Z3, Z4, Z5, and Z6.

  The processing for the odd frame as described above is performed, and when i> 2N, the process returns to step S22, and steps S22 to S24 are performed to determine again whether the frame is an odd frame (step S25). This time, since the processing is for the second frame of the two frames constituting one unit, it is determined that the frame is an even frame. In this case, i is set to N + 1 and j is set to 1 (step S30). ).

  Then, it is determined whether or not j> 2N (step S31). If j> 2N, the process returns to step S22. If j is 2N or less, a display corresponding to Zi is synthesized, and Zi A process of turning on the light source corresponding to (step S32) is performed. Then, i is set to a value obtained by imod2N + 1, j is set to j + 1 (step S33), and the process returns to step S31.

That is, if it is determined that the frame is an even frame (n + 1 frame in FIG. 10), i = N + 1 at first, and therefore, for example, if the reference color is three colors of RGB (N = 3), i = N + 1 As a result, i = 4, a display corresponding to Z4 (fourth subframe among six subframes of n + 1 frames in FIG. 10) is synthesized, and a light source corresponding to Z4 is turned on.
Then, i is a value obtained by imod2N + 1 and j is j + 1. In this case, since N = 3, i becomes 4 = 6 + 1 and i = 5, and this time, the display corresponding to Z5 (the fifth subframe of the 6 subframes of n + 1 frames in FIG. 10) is synthesized. And the process which lights the light source corresponding to Z5 is performed. Such processing is performed until j = 2N = 6. As a result, the display sequence in the even frame, that is, n + 1 in FIG. 10, is Z1, Z2, Z3, Z4, Z5, and Z6.

  Note that the odd frames in step S25 in the flowchart of FIG. 11 correspond to n frames in FIG. 10, and the even frames in step S25 correspond to n + 1 frames in FIG. Therefore, the display sequence of n frames (odd frames) in FIG. 10 is in the order of Z1, Z2, Z3, Z4, Z5, and Z6 as described in the flowchart of FIG. 11, and displays n + 1 frames (even frames). Similarly, the sequence is in the order of Z4, Z5, Z6, Z1, Z2, and Z3.

  As described above, in the second embodiment, YGCCBMR is allocated to six subframes constituting the first frame among the two frames constituting one unit, as in the first embodiment. BMRYGC is allocated to the six subframes constituting the second frame. That is, in the second embodiment, a certain reference color and its complementary color are associated with each corresponding subframe of two frames constituting one unit. The color sequential display process is performed by the display sequence as described in the flowchart of FIG.

Thus, in the second embodiment, a temporal color mixing effect is obtained, and color breakup is difficult to see. Since the second embodiment is similar in concept to Patent Document 2, the sum of absolute values of signal changes (T0) in Embodiment 2 and the sum of signal changes (T2) in Patent Document 2 are the same as in First Embodiment. And as an average value of all colors,
Sum of absolute values of signal changes in Embodiment 2 T0: 405 (per transition: 34)
Sum of absolute values of signal change in Patent Document 2 T2: 557 (per transition: 46)
It becomes. In addition, the number of times the light source is switched is 13 in Patent Document 2 and 6 in Embodiment 2.

  In the second embodiment, as in the first embodiment, since one frame is composed of six sub-frames, even if color breakup occurs, the width can be reduced and it is difficult to be visually recognized. Further, in the same simplicity as in Patent Document 2, the integrated value of signal change can be reduced to about 73% of Patent Document 2. Thereby, the display accuracy in a display device with a slow response speed can be improved. In the second embodiment, the number of times the light source is switched can be suppressed to ½ or less as compared with Patent Document 2.

  In the second embodiment, as shown in FIG. 9, there is a portion where the shortest lighting section is 1 subframe in R and B, but G has a period of 6 subframes (1 frame). Since green (G) is the color component most sensitive to human vision, it indicates that image data highly correlated with green (G) is likely to be continuous.

[Embodiment 3]
In the third embodiment, the color order set up to this point is replaced by encryption data or the like. Thereby, for example, even if the image data is intercepted by a malicious user at the connection portion between the image data output device that outputs the image data and the image display device that displays the image data output from the image data output device, The effect of making unauthorized use of the image data difficult is obtained.

  FIG. 12 is a diagram showing the configuration of the third embodiment. In the third embodiment, an image display system including an image display device 102 and an image data output device 20 that supplies image data to the image display device 102 will be described as an example. The image display apparatus 102 corresponds to the image display apparatus 101 (see FIG. 1) according to the first embodiment, but the configuration thereof is partially different from the image display apparatus 101.

The image data output device 20 includes an image data input unit 21, a color component separation unit 22, a timing generation unit 23, an encryption key generation unit 24, an encryption key output unit 25, a color composition control unit 26, a timing output unit 27, and a color component selection. A combining unit 28 and a combined image data output unit 29 are provided.
On the other hand, the image display device 102 includes a timing generation unit 3, a light source control unit 4, a light emitting device 6, an electro-optic modulation device 7, a composite image data input unit 11, and an encryption key input unit 12.

  FIG. 13 is a flowchart showing the color sequential display operation of the third embodiment. In the flowchart of FIG. 13, step S47 and subsequent steps are the same processing as step S22 and subsequent steps in the flowchart showing the color sequential display operation of the second embodiment (see FIG. 11), so the processing from steps S41 to S46 in FIG. .

  In FIG. 13, first, the encryption key K is input (step S41). Then, the frame number F is set to 0 (step S42), and an N color order creation process is performed (step S43). This N color sequence creation process is the process of the flowchart of FIG. Next, F is set to F + 1 (step S44), and encrypted data E is obtained from F and K (step S45). Then, the color order Zi is rotated by the encrypted data E only. Since the process after step S47 is the same as the process after step S22 of FIG. 11, description is abbreviate | omitted.

  The rotation here is, for example, an operation of sliding the YGCCBMR one by one in the left or right direction. As an example, if the YGCCBMR is rotated by 1 to the right, it becomes RYGCBM, which is further rotated by 1 to the right. If it performs, it will become MRYMCB.

  As described above, in the third embodiment, certain encryption data E is generated from the encryption key K and the frame number F, and the color order is rotated based on the generated encryption data E.

  FIG. 14 is a diagram schematically showing the color order of the third embodiment on the xy chromaticity shown in FIG. 15, and the symbol fJeAoU indicates a certain color order. For example, in FIG. 15, the color order corresponding to f, J, e, A, o, U is Y, G, C, B, M, R, and this is the initial value.

  When this initial value is rotated by the random number 3 as the encrypted data E (the random number 3 here is rotated to the left by 3), the initial value YGCBMR becomes BMRYGC. Further, when the color order BMRYGC obtained by this rotation is further rotated by a random number 1 as encryption data (the random number 1 here is a rotation of 1 to the left), BMRYGC becomes MRYGCB.

  For example, in the case of the first embodiment, the first frame is the initial color order YGCCBMR, and the second frame is rotated 3 to the left by a random number 3 to obtain the BMRYGC color order. Is a process in which the random number 1 is rotated to the left by 1 to obtain the MRYGCB color order.

  In the case of the second embodiment, since two frames are used as one unit and the subframe of the first frame and the corresponding subframe of the second frame are complementary colors, the relationship is maintained. Rotate the color order. Therefore, for example, when the first frame of two frames constituting one unit is rotated 3 to the left by a random number 3 to obtain the BMRYGC color order, the second frame that forms a pair with it The eyes are in YGCBMR color order.

  As described above, since the color order is changed in units of a predetermined frame by rotating the color order with the encryption data, even if a malicious user intercepts the image data, unauthorized use is difficult.

  In addition, the encryption data may be not only data for rotating the color order but also data that reverses the color order. For example, for each frame, the color order is rotated or a certain frame is rotated. May be data that combines rotation and reverse color order, such as reverse color order.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention. For example, in each of the above-described embodiments, the display device (electro-optic modulator) 7 used in the image display apparatus 101 in FIG. 1 and the image display apparatus 102 in FIG. 12 is shown as an example of a transmissive liquid crystal display device. However, the present invention is not limited to this, and a reflective display device called DMD (registered trademark) or LCOS may be used. Further, although the color components are six primary colors including the three primary colors RGB and its complementary colors CMY, the present invention is not limited to this. Further, the light emitting means is not limited to the LED.

  The present invention can also create a processing program in which the image display processing procedure for realizing the present invention described above is described, and the processing program can be recorded on various recording media. Accordingly, the present invention includes a recording medium on which the image display processing program is recorded. Further, the image display processing program may be obtained from the network.

1 is a diagram illustrating a configuration of an image display device according to a first embodiment. The figure which shows a structure in case the image display apparatus shown in FIG. 1 is projection type display apparatuses, such as a projector. The flowchart which showed the method of calculating | requiring the color order with respect to a color component of N color, when a color component is N colors (N is an integer greater than or equal to 3). The figure which shows typically the color order of Embodiment 1 on xy chromaticity shown in FIG. The time chart which expressed the change of the color shown in FIG. 4 with the combination of RGB. FIG. 4 is a flowchart illustrating a color sequential display processing procedure according to the first embodiment using a color order created according to FIG. 3. FIG. FIG. 3 is a diagram illustrating lighting timings of RGB light sources for displaying cyan and signals applied to the electro-optic modulation device in the first embodiment. FIG. 3 is a diagram for explaining quantitative evaluation of a signal change given to the electro-optic modulation device in the first embodiment. The figure which shows typically the color order of Embodiment 2 on xy chromaticity shown in FIG. The time chart which expressed the change of the color shown in FIG. 9 with the combination of RGB. 6 is a flowchart illustrating a color sequential display processing procedure according to the second embodiment using the color order created in FIG. 3. FIG. 6 is a diagram illustrating a configuration of an image display device according to a third embodiment and an image data output device that supplies image data to the image display device. 10 is a flowchart illustrating a color sequential display processing procedure according to the third embodiment using the color order created in FIG. 3. The figure which shows typically the color order of Embodiment 3 on xy chromaticity shown in FIG. The figure which shows xy chromaticity diagram. The figure explaining the phenomenon of a color break. The figure which showed the relative positional relationship of RGB and CMY on xy chromaticity shown in FIG. 15 typically, and showed the color order described in Embodiment 2 in patent document 2 on it. The time chart which expressed the color change of FIG. 17 with the combination of RGB. The figure explaining the response | compatibility of the response speed of a display device, and display operation | movement. FIG. 6 is a diagram showing lighting timings of RGB light sources when displaying cyan in Patent Document 2 and the magnitude of a signal given to an electro-optic modulation device. The figure explaining the color order of patent document 1 on xy chromaticity shown in FIG. The time chart which expressed the change of the color of FIG. 21 by the combination of RGB. FIG. 6 is a diagram showing lighting timing of RGB light sources and the magnitude of a signal given to an electro-optic modulation device when cyan is displayed in Patent Document 1.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Image data input part, 2 ... Color component decomposition part, 3 ... Timing generation part, 4 ... Light source control part, 5 ... Color component selection synthesis | combination part, 6 ... Light-emitting device 7, display device (electro-optic modulation device), 101, 102 ... image display device, 12 ... encryption key input unit, 20 ... image data output device, 24 ... encryption key generation unit 25: Encryption key output unit, R, G, B: Reference color, CMY: Complementary color

Claims (11)

An image display method for performing color sequential display using a reference color of N colors (N is an integer of 3 or more) on the chromaticity diagram and its complementary color,
In the chromaticity diagram, the distance when the reference color excluding the reference color starting from a certain reference color of the N reference colors as a starting point and returning to the starting reference color is minimized. A first step of arranging the N reference colors in a color order as follows:
A second step of setting N complementary colors for the N reference colors arranged as the color order;
A complementary color closest to two adjacent reference colors among the N reference colors arranged in the color order is selected from the complementary colors set in the second step, and the selected complementary color is selected as a color. By inserting between the two adjacent reference colors as an order, the individual reference colors of the N reference colors and the individual complementary colors of the N complementary colors are alternately arranged and sequentially displayed. A third step of setting as the color order for
An image display method characterized by comprising: The image display method according to claim 1,
In the process of selecting the complementary color closest to the two adjacent reference colors, the sum of the distances from the reference colors of the two adjacent reference colors to the N complementary colors set in the second step is obtained. An image display method characterized in that a complementary color having a minimum sum of the obtained distances is set as a complementary color closest to the two adjacent reference colors. The image display method according to claim 1 or 2,
The image display method according to claim 1, wherein the chromaticity diagram is an xy chromaticity diagram. The image display method according to any one of claims 1 to 3,
One frame of image data to be displayed is composed of 2N subframes, and each of the N reference colors and the N complementary colors is added to each of the 2N subframes. Are correlated in the color order or vice versa. The image display method according to claim 4,
An image display method characterized in that two consecutive frames of the image data are taken as one unit, and a sub-frame corresponding to each of the two consecutive frames is associated with a certain reference color and its complementary color. The image display method according to claim 4 or 5,
An image display method characterized in that the color order is changed in units of frames of the image data based on encryption data. The image display method according to claim 6,
The image display method, wherein the encryption data is data for rotating the color order and / or data for reversing the color order. In the image display method in any one of Claims 1-7,
The image display method according to claim 1, wherein the reference colors are red (R), green (G), and blue (B), and the complementary colors are cyan (C), magenta (M), and yellow (Y). The image display method according to claim 8.
One frame of image data to be displayed is composed of six subframes, and each of the RGB reference colors and CMY complementary colors is assigned to each of the six subframes. The color order is one of RYGCBM, YGCBMR, GCBMRY, CBMRYG, BMRYGC, MRYGCB, RMBCGY, MBCGYR, BCGYRM, CGYRMB, GYRMBC, and YRMMBCG. An image display method characterized by being. An image display processing program for performing color sequential display using a reference color of N colors (N is an integer of 3 or more) on the chromaticity diagram and its complementary color,
In the chromaticity diagram, the distance when the reference color excluding the reference color starting from a certain reference color of the N reference colors as a starting point and returning to the starting reference color is minimized. A first step of arranging the N reference colors in a color order as follows:
A second step of setting N complementary colors for the N reference colors arranged as the color order;
A complementary color closest to two adjacent reference colors among the N reference colors arranged in the color order is selected from the complementary colors set in the second step, and the selected complementary color is selected as a color. By inserting between the two adjacent reference colors as an order, the individual reference colors of the N reference colors and the individual complementary colors of the N complementary colors are alternately arranged and sequentially displayed. A third step of setting as the color order for
An image display processing program characterized in that can be executed. An image display device that performs color sequential display using a reference color of N colors (N is an integer of 3 or more) on the chromaticity diagram and its complementary color,
An image display device that performs color sequential display using a color sequence for color sequential display created by the image display method according to claim 1.

Images