WO2008012969A1

WO2008012969A1 - Multiple original color display device

Info

Publication number: WO2008012969A1
Application number: PCT/JP2007/058195
Authority: WO
Inventors: Kazunari Tomizawa; Tomohiko Mori; Shun Ueki; Takao Muroi
Original assignee: Sharp Kabushiki Kaisha
Priority date: 2006-07-25
Filing date: 2007-04-13
Publication date: 2008-01-31

Abstract

A multiple original color display device is provided with a multiple original color display panel with pixels including n sub-pixels (n is a natural number that is not less than 4) and a signal converting unit for generating multiple original color signals indicating brightness of the n sub-pixels from an input video signal. The signal converting unit obtains brightness for (n-3) sub-pixels out of that for the n sub-pixels with reference to a look-up table in accordance with the video signal, carries out an arithmetic operation using the brightness for the (n-3) sub-pixels and obtains brightness for the remaining 3 sub-pixels out of the n sub-pixels.

Description

Specification

Multi-primary color display device

Technical field

The present invention relates to a multi-primary color display device, and more particularly, to a multi-primary color display device including a signal conversion device that generates a multi-primary color signal from a video signal.

Background art

[0002] Color display devices such as color televisions and color monitors usually perform color expression by additively mixing RGB primary colors (ie, red, green and blue). In general, each pixel of the color display device has red, green and blue sub-pixels corresponding to the RGB primary colors. Such a display device receives a YCrCb (YCC) signal that can be converted into an RGB signal, and the luminance (luminance level) of the red, green, and blue sub changes based on the Y CrCb signal. Various colors are expressed.

[0003] In recent years, unlike the three primary color display devices described above, color reproduction is achieved by additively mixing four or more primary colors, which are three primary colors called RGB, and another primary color added. A multi-primary color display device that can expand the range has been proposed! In a multi-primary color display device, the luminance (luminance level) of a multi-primary color is determined based on a video signal combined with a YCrCb signal and an RGB signal (see, for example, Patent Document 1).

Patent Document 1: Special Table 2004-529396

Disclosure of the invention

Problems to be solved by the invention

[0004] When a color specified by a video signal is expressed by the luminance (luminance level) of multiple primary colors, there are a plurality of combinations (patterns) for the luminance (luminance level) of each primary color. The color specified in the video signal is represented by three variables (for example, color coordinates RGB or XYZ), whereas in a multi-primary color display device, the color is specified by four or more variables. is there. For example, the luminance (luminance level) of the three primary colors in the video signal is 256 gradations, and each pixel has five sub-pixels in the multi-primary color display panel, and each of the five sub-pixels. Specified in the video signal when the luminance (luminance level) is 256 gradations The maximum possible combination of sub-pixel brightness to represent a color is 256 x 256.

[0005] However, good display is not performed in any of a plurality of combinations. For example, when a display is performed with a combination of a plurality of combinations, a so-called whitening phenomenon may occur. Therefore, in order to perform a desired display, it is necessary to select an intermediate combination of a plurality of combinations for expressing a specific color and an appropriate combination.

[0006] Further, in order to select an appropriate combination, data indicating the luminance of each sub-pixel determined in advance for each color specified in the video signal is used as a lookup tape. If it is stored in the screen, a desired display can be performed by referring to the look-up table according to the video signal. However, storing data indicating the luminance of each sub-pixel for each specific color in this way increases the amount of data in the lookup table, and the lookup table can be created using an inexpensive memory with a small capacity. It cannot be configured easily.

[0007] The present invention has been made in view of the above problems, and an object of the present invention is to provide a multi-primary color display device in which a norec-up table is simply configured.

Means for solving the problem

[0008] The multi-primary color display device of the present invention includes a multi-primary color display panel having pixels including n (n is a natural number of 4 or more) sub-pixels, and the n sub-pixels from the input video signal A multi-primary color display device including a signal conversion unit that generates a multi-primary color signal indicating the luminance of the image signal, wherein the signal conversion unit refers to the lookup table based on the video signal. The luminance of n−3 subpixels of the subpixels is obtained, and the remaining 3 of the n subpixels are calculated by performing the calculation using the luminance of the n−3 subpixels. The luminance of each sub-pixel is obtained.

[0009] In one embodiment, the look-up table indicates the brightness of the n-3 sub-pixels corresponding to a number of colors less than the number of colors that can be specified by the video signal. I have data.

[0010] In one embodiment, the signal converter includes an interpolator that interpolates luminance of the n-3 sub-pixels using data of the lookup table.

In one embodiment, n is 4, and the n sub-pixels are red, green, blue and blue. And yellow sub-pixels.

[0012] In one embodiment, the n is 5, and the n sub-pixels include red, green, blue, yellow, and cyan sub-pixels.

[0013] In one embodiment, the n is 6, and the n sub-pixels include red, green, blue, yellow, cyan, and magenta sub-pixels.

[0014] In one embodiment, the remaining three sub-pixels are the red, green, and blue sub-pixels.

[0015] The multi-primary color display device of the present invention includes a multi-primary color display panel having pixels that perform display using n (n is a natural number of 4 or more) primary colors, and the n video signals from the input video signal. A multi-primary color display device comprising a signal conversion unit that generates a multi-primary color signal indicating the brightness of the primary color, wherein the signal conversion unit refers to the lookup table based on the video signal, and The luminance of n-3 primary colors out of the primary colors is obtained, and the calculation using the brightness of the n-3 primary colors is performed to obtain the remaining three primary colors. Get brightness.

[0016] The signal conversion apparatus of the present invention is a signal conversion apparatus that generates a multi-primary color signal indicating luminance of primary colors of n (n is a natural number of 4 or more) input video signals. The luminance of n-3 primary colors out of the n primary colors is obtained by referring to a lookup table based on the signal, and the calculation using the luminance of the n-3 primary colors is performed. Get the brightness of the remaining 3 primary colors out of the n primary colors.

[0017] The signal conversion method of the present invention is a signal conversion method for generating a multi-primary color signal indicating the luminance of n primary colors (n is a natural number of 4 or more) from the input video signal. Obtaining a brightness of n-3 primary colors out of the n primary colors by referring to a lookup table based on the signal, and performing an operation using the brightness of the n-3 primary colors And obtaining the luminance of the remaining three primary colors out of the n primary colors.

[0018] A program according to the present invention is a program for causing a computer to execute a signal conversion method for generating a multi-primary color signal indicating the luminance of n primary colors (n is a natural number of 4 or more) from the input video signal. The signal conversion method obtains brightness of n-3 primary colors out of the n primary colors by referring to a lookup table based on the video signal. And obtaining the luminance of the remaining three primary colors out of the n primary colors by performing an operation using the luminance of the n−3 primary colors.

The invention's effect

[0019] According to the present invention, it is possible to provide a multi-primary color display device in which a lookup table is simply configured.

Brief Description of Drawings

FIG. 1 is a schematic block diagram showing a first embodiment of a multi-primary color display device according to the present invention.

FIG. 2 is a schematic diagram showing one pixel of a multi-primary color display panel in the multi-primary color display device of Embodiment 1.

FIG. 3 is a schematic block diagram showing a configuration of a signal conversion circuit in the multi-primary color display device of Embodiment 1.

FIG. 4 is a schematic block diagram showing a configuration of a signal conversion circuit in a second embodiment of a multi-primary color display device according to the present invention.

Explanation of symbols

[0021] 100 multi-primary color display device

200 Multi-primary color display panel

210 pixels

300 Signal conversion circuit

310 color coordinate conversion circuit

320 Lookup table memory

325 Interpolator

330 Arithmetic circuit

340 Correction unit

BEST MODE FOR CARRYING OUT THE INVENTION

[0022] (Embodiment 1)

Hereinafter, a first embodiment of a multi-primary color display device according to the present invention will be described with reference to the drawings. FIG. 1 shows a multi-primary color display device 100 of the present embodiment. The multi-primary color display device 100 includes a multi-primary color display panel 200 having pixels including n sub-pixels (n is a natural number of 4 or more), and a signal conversion circuit 300 that generates a multi-primary color signal from an image signal. Yes. Here, the multi-primary color display device 100 is a liquid crystal display device, and the multi-primary color display panel 200 is a liquid crystal display panel.

FIG. 2 shows one pixel 210 in the multi-primary color display panel 200. In the multi-primary color display device of the present embodiment, the pixel 210 has five sub-pixels, that is, a red sub-pixel (R), a green sub-pixel (G), a blue sub-pixel (B), a yellow sub-pixel (Ye), and Has cyan sub-pixel (C). The five subpixels in the pixel 210 form, for example, five different subpixel regions per pixel region in a color filter layer (not shown) provided in the multi-primary color display panel 200. This is realized by forming color filters of different colors in the pixel area.

FIG. 3 shows the configuration of the signal conversion circuit 300. The signal conversion circuit 300 includes a color coordinate conversion circuit 310, a lookup table memory 320, an arithmetic circuit 330, and a correction unit 340.

The color coordinate conversion circuit 310 receives a video signal indicating the luminance (luminance level) of the three primary colors represented by the RGB color coordinates, and converts the color coordinates of the luminances of the three primary colors into RGB colors XYZ. Specifically, as shown in Equation 1, the color coordinate conversion circuit 310 performs a 3 × 3 matrix calculation on Ri, Bi, and Gi shown in the video signal to obtain X, Y, and Ζ. obtain. This 3-by-3 matrix is determined, for example, by the V.709 standard. The possible values of Ri, Gi, Bi shown in the video signal are 0 to 1, with value 0 corresponding to the minimum gradation of the three primary color display device and value 1 corresponding to the maximum gradation of the three primary color display device is doing.

[Number 1]

(X, (0.41240.3, 35760.1804 (Ri,

Y-0 • 2127 0. 7152 0. 0722 Gi

, ² J ί ^0. 0193 0. 1192 0. 9502

), ^Bi

•--(Formula 1)

The lookup table memory 320 stores a lookup table! look The up-table has data indicating the brightness of yellow and cyan sub-pixels corresponding to the brightness (luminance levels) Ri, Gi, Bi of the three primary colors. Here, the luminances Ri, Gi, and Bi are obtained by performing inverse γ correction on the gradation values expressed in 256 gradations, and are 256 × 256 × 256, which is the number of colors that can be specified by the video signal. On the other hand, Norec tape memory 320 has a 256x256x256 3D matrix data corresponding to the number of colors that can be specified by the video signal. Yes. Look-up table By referring to the look-up table in the memory 320, the brightness Ye, C of the yellow and cyan sub-pixels corresponding to the brightness Ri, Gi, Bi can be obtained.

The arithmetic circuit 330 uses the XYZ obtained by the color coordinate conversion circuit 310 and the luminances (luminance levels) Ye ′ and C ′ of the yellow and cyan sub-pixels obtained by the lookup table memory 320 to generate red, Get the luminance (luminance levels) R ', G', B 'of the green and blue sub-pixels. The arithmetic circuit 330 performs an operation for obtaining luminances (luminance levels) R ′, G ′, and B ′ of red, green, and blue sub-pixels according to Equation 4 described later. Equation 4 will be described below with reference to Equation 2 and Equation 3.

[0029] X, Y, and Ζ obtained by converting the luminances of the three primary colors Ri, Bi, and Gi are three rows for R, G, B ', Ye', and C ', as shown in Equation 2. It is also expressed by matrix calculation of 5 columns. Here, R ′, G ′, B ′, Ye ′, and C ′ are theoretical values of the luminance (luminance level) of each sub-pixel. X, Y, and Ζ obtained by converting Ri, Bi, and Gi in this way have a predetermined relationship with R ′, G ′, B ′, Ye ′, and C ′. This is because the color specified by the video signal input to the signal conversion circuit 300 is theoretically equal to the color specified by the multi-primary color signal output from the signal conversion circuit 300.

[Equation 2]

(Formula 2)

ZR ZG

In Equation 2, the 3 × 5 matrix is determined based on the multi-primary color display panel 200. For example, X, Y, and Z are red subpixels of the multi-primary color display panel 200 (see Fig. 1). Determined by. This corresponds to XYZ when only the red sub-pixel is set to the maximum gradation. Similarly, in Equation 2, X, Y, and Z are determined by the green subpixel, and X, Y

G G G B B

, Z is determined by the blue subpixel, X, Y, z are determined by the yellow subpixel,

B Ye Ye Ye

X, Y and Z are determined by the cyan sub-pixel.

c c c

[0031] By transforming Equation 2 so that R ', G', B 'and Ye', C 'are expressed separately, X, Y, and Z become R, G, as shown in Equation 3. It is expressed as the sum of a 3-by-3 matrix calculation for,, B, and a 3-by-2 matrix calculation for Ye, C,.

[Equation 3]

(Formula 3)

As described above, the 3 × 3 matrix is determined by the red, green, and blue subpixels, and the 3 × 2 matrix is determined by the yellow and cyan subpixels. By transforming Equation 3, Equation 4 is obtained.

[Equation 4]

(Formula 4)

The calculation circuit 330 performs the calculation shown in Expression 4 based on X, Y, Ζ from the color coordinate conversion circuit 310 and Ye, C of the lookup table memory 320. As a result, R ', G', and B 'corresponding to Ye, C obtained by referring to the lookup table are obtained.

Next, the correction unit 340 is adapted to the multi-primary color display panel 200 (see FIG. 1), Ye, C from the lookup table memory 320, and R, G,. : Correct B. Since R,, G, B, Ye, and C obtained by the lookup table memory 320 and the arithmetic circuit 330 are theoretical values, the actual multi-primary colors are corrected by correcting them in the correction unit 340. A multi-primary color signal suitable for the display panel 200 can be generated. The multi-primary color signal generated in this way is output to the multi-primary color display panel 200.

As described above, in the multi-primary color display device 100 of the present embodiment, the lookup table memo The luminance of the two sub-pixels is determined using the lookup table stored in the memory 320, and the luminance of the remaining three sub-pixels is determined by the arithmetic circuit 330. In the multi-primary color display device 100 of the present embodiment, the look-up table stored in the look-up table memory 320 has the luminance (that is, Ye ′ and C ′) of two sub-pixels out of the five sub-pixels. ) Only need to be included. Therefore, in the multi-primary color display device 100 of the present embodiment, a lookup table can be simply configured using a low-capacity and inexpensive memory.

In the multi-primary color display device 100 of the present embodiment, Ye ′ and C ′ are determined with reference to the lookup table, and then the arithmetic circuit 330 performs an operation using Ye and C ′. Thus, R, G, B are obtained, and R, G, B, corresponding to Ye and C, are determined. As described above, when the color specified in the video signal is expressed by the brightness (brightness level) of the five sub-pixels, there are a plurality of combinations. In the multi-primary color display device 100 of the present embodiment, the desired color is desired. By storing data indicating Ye 'and C' determined in advance so as to satisfy the conditions for displaying the values in the lookup table, Ye ', C' and the corresponding R, G ', B' is obtained, and as a result, it is possible to select a combination that can achieve the desired display even with the medium power of multiple combinations.

In the above description, the video signal conforms to the BT.709 standard, but the present invention is not limited to this. In a video signal conforming to the xvYCC standard, etc., the 3 × 3 matrix is equal to Equation 1, but the values that the three primary colors can take are not specified. In this case, the possible values of Ri, Gi, Bi are, for example, uniquely 0.05 to 1.33, and the brightness Ri, Gi, Bi are 355 gradations from the 65th to 290th gradations. It is also possible to use a 3D look-up table that is uniquely set as an inverse gamma correction of the expressed gradation value and extended to 355 Χ 355 Χ 355. Thereby, the look-up table can obtain the luminance of the two sub-pixels (Ye, C) by referring to the gradation value. Note that when any one of Ri, Gi, and Bi is a negative value, the multi-primary color display panel 200 represents a color outside the color reproduction range defined in BT.

[0038] In the above description, Ri, Gi, and Bi represent the luminances (luminance levels) of the three primary colors! /, But the present invention is not limited to this. Ri, Gi, and Bi are the values before inverse gamma correction processing is performed. It is a so-called gradation value, and the lookup table may be created so as to obtain the luminance with reference to the gradation value.

[0039] (Embodiment 2)

In the multi-primary color display device of Embodiment 1 described above, the power of the lookup table having data corresponding to the same number of colors as the number of colors that can be specified by the video signal is not limited to this.

Hereinafter, a second embodiment of the multi-primary color display device according to the present invention will be described. The multi-primary color display device of this embodiment has the data corresponding to the number of colors, which is smaller than the number of colors that can be specified by the video signal, in the look-up table. The configuration is the same as that of the multi-primary color display device according to Embodiment 1 described with reference to FIG. 3, and redundant description is omitted to avoid redundancy.

FIG. 4 shows a configuration of the signal conversion circuit 300 in the multi-primary color display device of the present embodiment.

As shown in FIG. 4, the signal conversion circuit 300 in the multi-primary color display device according to the present embodiment includes an interpolation circuit 325 in addition to the color coordinate conversion circuit 310, the look-up table memory 320, the arithmetic circuit 330, and the correction unit 340. It has further.

In the multi-primary color display device of the present embodiment, the lookup table data in the lookup table memory 320 corresponds to a number of colors that is smaller than the number of colors that can be specified by the video signal. Here, the luminance Ri, Gi, and Bi of the three primary colors shown in the video signal are each 256 gradations, and the number of colors that can be specified by the video signal is 256 × 256 × 256. On the other hand, the lookup table in the lookup table memory 320 corresponds to gradations of 16 gradations such as 0, 16, 32,..., 256 gradations for each of the luminance Ri, Gi, and Bi. X 17 X 17 3D matrix data. The possible range of the luminance (brightness level) of the three primary colors shown in the video signal is 256 X 256 X 256, while the lookup table in the lookup table memory 320 is 256 X 2 56 X 256. The data of bow |, 17 x 17 x 17 is included, and this makes it possible to further reduce the amount of data in the norec-up table.

The interpolation circuit 325 interpolates the luminance Ye ′ and C ′ of the yellow and cyan sub-pixels using the look-up table data. The interpolation circuit 325 performs interpolation by linear approximation, for example. Do. For example, if it corresponds to the luminance values of three primary colors, Ri, Gi, Bi force (18Z256, 35/256, 24/256), the interpolator 325 has a gradation value (16Z256, 32/256, 16 / 256), (16/256, 32/256, 32/256), (16/256, 48/256, 16/256), (1 6/256, 48/256, 32/256), (32 / 256, 32/256, 16/256), (32/256, 32/256, 32/256), (32/256, 48/256, 16/256), (32/256, 48/256, 32 / A linear approximation is performed using the data indicating the brightness of the yellow and cyan sub-pixels in the lookup table corresponding to 256), thereby obtaining the brightness Ye,, C of the yellow and cyan sub-pixels. As described above, the luminance Ye ′, C ′ of the yellow and cyan sub-pixels corresponding to the luminances Ri, Gi, Bi of the three primary colors can be obtained.

[0044] The arithmetic circuit 330 uses the XYZ obtained by the color coordinate conversion circuit 310 and the luminances (luminance levels) Ye ′ and C ′ of the yellow and cyan sub-pixels obtained by referring to the lookup table. Get the luminance (luminance levels) R ', G', B 'of the red, green and blue sub-pixels. The specific calculation by the calculation circuit 330 is the same as that described above in the first embodiment. The correction unit 340 also operates in the same manner as described above in the first embodiment, thereby generating a multi-primary color signal.

As described above, in the multi-primary color display device 100 of the present embodiment, the color corresponding to the data in the lookup table stored in the lookup table memory 320 is more than the number of colors that can be specified by the video signal. Therefore, the amount of data in the look-up table can be further reduced, and the look-up table can be simply configured using a memory having a small capacity.

In the above description, the signal conversion circuit 300 includes the interpolation circuit 325, but the present invention is not limited to this. The signal conversion circuit 300 may not include an interpolation circuit. In the above description, the lookup table memory 320 selects a plurality of data corresponding to the luminances (luminance levels) Ri, Gi, and Bi of the three primary colors, and these are interpolated by the interpolation circuit 325. When the conversion circuit 300 does not have an interpolation circuit, the lookup table memory 320 selects one data corresponding to the luminances (luminance levels) Ri, Gi, Bi of the three primary colors from the lookup table, The brightness of yellow and cyan sub-pixels may be set to Ye ', C'.

Note that in the multi-primary color display devices of Embodiments 1 and 2 described above, the video signal has an RGB color constellation. The force represented by the mark The present invention is not limited to this. The video signal may be expressed in other color coordinates such as XYZ.

In the multi-primary color display devices of Embodiments 1 and 2 described above, the lookup table refers to the luminance (brightness level) or gradation value of the three primary colors represented by the color coordinates RGB. Akira is not limited to this. The lookup table may refer to color coordinates expressed in XYZ, or other three-dimensional color coordinates. Further, the lookup table may be accessible even when the RGB brightness and gradation value are negative as described above.

[0049] In the multi-primary color display devices of Embodiments 1 and 2 described above, the lookup table has data indicating the luminance of yellow and cyan sub-pixels among red, green, blue, yellow and cyan sub-pixels. Therefore, the power obtained by the luminance of the remaining sub-pixels (that is, red, green, and blue sub-pixels) by the arithmetic circuit 330 is not limited to this. The look-up table has data indicating the luminance of other sub-pixels (for example, blue and yellow sub-pixels), and the luminance of the remaining sub-pixels (for example, red, green and cyan sub-pixels) by the arithmetic circuit 330 You may get

[0050] Further, in the multi-primary color display devices of the first and second embodiments described above, one pixel in the multi-primary color display panel 200 has five sub-pixel forces. The present invention is not limited to this. Yes. One pixel power may be formed from a number of sub-pixels. In this case, the luminance of one subpixel is obtained by referring to the lookup table stored in the lookup table memory 320, and the luminance of the remaining three subpixels is obtained by the computation of the arithmetic circuit 330. The four sub-pixels are, for example, red, green, blue, and yellow sub-pixels. The luminance of the yellow sub-pixel is obtained by referring to the lookup table, and the luminance of the red, green, and blue sub-pixels is obtained by the arithmetic circuit 330. You may get

[0051] One pixel may be formed with six sub-pixel forces. In this case, the luminance of the three sub-pixels is obtained by referring to the lookup table stored in the lookup table memory 320, and the luminance of the remaining three sub-pixels is obtained by the arithmetic circuit 330. The six sub-pixels are, for example, the red, green, and blue sub-pixels corresponding to the three primary colors of light, and the yellow, cyan, and magenta sub-pixels corresponding to the three primary colors. Refer to the lookup table. The luminance of yellow, cyan and magenta sub-pixels can be obtained, and the luminance of red, green and blue sub-pixels can be obtained by the arithmetic circuit 330.

[0052] In the multi-primary color display devices of Embodiments 1 and 2 described above, the multi-primary color display panel 200 in the multi-primary color display device 100 is a force that performs color expression using a color filter. The apparatus is not limited to this. The multi-primary color display panel 200 may perform color expression by driving in a field sequential manner. Even when the multi-primary color display panel 200-power S field sequential method is used, the signal conversion circuit 300 may output a multi-primary color signal in the same manner as described above.

In the multi-primary color display devices of Embodiments 1 and 2 described above, the multi-primary color display device is a liquid crystal display device, but the present invention is not limited to this. Other display devices such as a plasma display device may be used.

[0054] In addition, the components included in the signal conversion circuit 300 of the multi-primary color display device 100 of Embodiments 1 and 2 described above can be realized by hardware, and part or all of these can be realized by software. You can also. When these components are implemented by software, this computer, which may be configured using a computer, has a central processing unit (CPU) for executing various programs and a work for executing these programs. It has RAM (random access memory) that functions as an area. Then, a program for realizing the function of each component is executed in the computer, and this computer is operated as each component.

[0055] Further, the program may be supplied to the recording medium power computer or may be supplied to the computer via a communication network. The recording medium may be configured so as to be separable from the computer or incorporated in the computer. This recording medium can be read via a program reading device connected to the computer as an external storage device, even if the recording program code is mounted on the computer so that the computer can directly read the recorded program code. It may be installed as described above. Recording media include, for example, tapes such as magnetic tapes and cassette tapes: flexible disks Z magnetic disks such as hard disks, magneto-optical disks such as MO and MD, and optical disks such as CD-ROM, DVD, and CD-R Disk: IC card (memory car Use a mask ROM, EPROM (Erasable Programmable Read Only Memory), EEPRuM (Electrically Erasable Programmable Read Only Memory), flash ROM, or other semiconductor memory. Can do. When a program is supplied via a communication network, the program may take the form of a carrier wave or a data signal in which the program code is embodied by electronic transmission.

Industrial applicability

The multi-primary color display device according to the present invention can be suitably used for, for example, a monitor of a personal computer, a television, a projector, and a display unit of a mobile phone.

Claims

The scope of the claims

[1] A multi-primary color display panel having pixels including n (n is a natural number of 4 or more) sub-pixels and an input video signal power signal that generates a multi-primary color signal indicating the luminance of the n sub-pixels Conversion part and

A multi-primary color display device comprising:

The signal conversion unit obtains brightness of n-3 subpixels of the n subpixels by referring to a lookup table based on the video signal, and the n-3 subpixels are obtained. A multi-primary color display device that obtains the luminance of the remaining three sub-pixels of the n sub-pixels by performing an operation using the luminance of the sub-pixels.

[2] The look-up table includes data indicating the brightness of the n-3 sub-pixels corresponding to the number of colors, which is smaller than the number of colors that can be specified by the video signal! The multi-primary color display device according to claim 1.

[3] The multi-primary color display device according to [2], wherein the signal conversion unit includes an interpolation unit that interpolates luminance of the n−3 sub-pixels using data of the lookup table.

[4] The multi-primary color display device according to any one of claims 1 to 3, wherein n is 4, and the n sub-pixels include red, green, blue, and yellow sub-pixels.

5. The multi-primary color display device according to claim 1, wherein n is 5, and the n sub-pixels include red, green, blue, yellow, and cyan sub-pixels.

6. The multi-primary color display device according to claim 1, wherein n is 6, and the n sub-pixels include red, green, blue, yellow, cyan, and magenta sub-pixels. .

7. The multi-primary color display device according to claim 1, wherein the remaining three sub-pixels are the red, green, and blue sub-pixels.

[8] A multi-primary color display panel having pixels that perform display using n primary colors (n is a natural number of 4 or more);

A signal conversion unit that generates a multi-primary color signal indicating the luminance of the n primary colors from the input video signal;

A multi-primary color display device comprising:

The signal converter refers to a lookup table based on the video signal. To obtain the luminance of n-3 primary colors out of the n primary colors and perform the calculation using the luminance of the n-3 primary colors to obtain the remaining 3 of the n primary colors. A multi-primary color display device that obtains the brightness of each primary color.

[9] A signal conversion device for generating a multi-primary color signal indicating the luminance of n primary colors (n is a natural number of 4 or more) from the input video signal,

Obtaining a luminance of n-3 primary colors out of the n primary colors by referring to a lookup table based on the video signal, and performing an operation using the luminance of the n-3 primary colors A signal conversion device that obtains the luminance of the remaining three primary colors of the n primary colors.

[10] A signal conversion method for generating a multi-primary color signal indicating the luminance of n primary colors (n is a natural number of 4 or more) from input video signals,

Obtaining a luminance of n-3 primary colors out of the n primary colors by referring to a lookup table based on the video signal;

Obtaining the luminance of the remaining three primary colors of the n primary colors by performing an operation using the luminance of the n-3 primary colors;

Including a signal conversion method.

[11] A program for causing a computer to execute a signal conversion method for generating a multi-primary color signal indicating the luminance of n primary colors (n is a natural number of 4 or more) of input video signals, The signal conversion method is

Obtaining the luminance of the remaining three primary colors out of the n primary colors by performing an operation using the luminance of the n-3 primary colors;

Including the program.