Signal processing circuit and method for self-luminous type display

• US 20050285828A1
• Filed: 06/24/2005
• Published: 12/29/2005
• Est. Priority Date: 06/25/2004
• Status: Abandoned Application

• Current Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Murata, Haruhiko, Mori, Yukio, Tanase, Susumu, Inoue, Masutaka, Yamashita, Atsuhiro
• Application Number:
  US11/165,272
• Publication Number:
  US 20050285828A1
• Time in Patent Office: Days
• US Class Current: 345/76
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• CPC Class Codes: G09G 2320/0242 Compensation of deficiencies in the appearance of colours
• CPC Class Codes: G09G 2320/0276 for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
• CPC Class Codes: G09G 2320/0666 for control of colour parameters, e.g. colour temperature
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]
• CPC Class Codes: G09G 5/02 characterised by the way in which colour is displayed details of colour display specific for CRTs G09G1/28; specific for flat matrix panels other than liquid crystal displays G09G3/2003; specific for liquid crystal displays G09G3/3607
• CPC Class Codes: H10K 59/351 comprising more than three subpixels, e.g. red-green-blue-white [RGBW]

Abstract

In a self-luminous type display in which one pixel includes four unit pixels of RGBW, a signal processing circuit includes first, second and third parts. The first part subtracts a minimum value in RGB input signals from each input signal of RGB. The second part calculates an RGBW signal corresponding to the case in which all the RGB input signals are the minimum value, based on an RGB signal value for realizing target white when all the RGB input signals are a maximum value. The third part determines the RGBW signal by adding a signal corresponding to each RGB subtraction result to the RGBW signal calculated by the second part. Each RGB subtraction result is calculated by the first part.

Claims

1. A signal processing circuit for a self-luminous type display in which one pixel includes four unit pixels of RGBW, the signal processing circuit comprising:

first means for subtracting a minimum value in RGB input signals from each input signal of RGB;

second means for calculating an RGBW signal corresponding to the case in which all the RGB input signals are the minimum value, based on an RGBW signal value for realizing target white when all the RGB input signals are a maximum value; and

third means for determining the RGBW signal by adding a signal corresponding to each RGB subtraction result to the RGBW signal calculated by the second means, each RGB subtraction result being calculated by the first means.

2. A signal processing circuit for a self-luminous type display, in which one pixel includes four unit pixels of RGBW, color filters are provided in the RGB unit pixels respectively, the color filter is not provided in the W unit pixel, and an RGBW signal value for realizing target white is set when all the RGB input signals are a maximum value, while white-side reference brightness is set such that the target white can be realized by only RGB when all the RGB input signals are the same value, the signal processing circuit comprising:

first means for subtracting a minimum value in RGB input signals from each input signal of RGB;

second means for calculating an RGBW signal corresponding to the case in which all the RGB input signals are the minimum value, based on an RGBW signal value for realizing target white when all the RGB input signals are a maximum value; and

third means for determining the RGBW signal by adding a signal corresponding to each RGB subtraction result to the RGBW signal calculated by the second means, each RGB subtraction result being calculated by the first means.

3. A signal processing circuit for a self-luminous type display, in which one pixel includes four unit pixels of RGBW, color filters are provided in the RGB unit pixels respectively, and the color filter is not provided in the W unit pixel, the signal processing circuit comprising:

reverse gamma correction means for converting an RGB input signal into a pre-gamma correction RGB signal by performing reverse gamma correction to the RGB input signal, gamma correction being previously performed to the RGB input signal;

RGB-RGBW signal conversion means for setting the RGB signal at the RGB input signal to convert the RGB input signal into an RGBW signal, the RGB signal being obtained by the reverse gamma correction means; and

gamma correction means for performing the gamma correction to the RGBW signal according to the self-luminous type display, the RGBW signal being obtained by the RGB-RGBW signal conversion means, wherein

an RGBW signal value for realizing target white is set when all the RGB signals obtained by the reverse gamma correction means are a maximum value, while white-side reference brightness of RGB is set such that the target white can be realized by only RGB when all the RGB input signals obtained by the reverse gamma correction means are the same value, and

the RGB-RGBW signal conversion means includes;

first means for subtracting a minimum value in RGB input signals from each input signal of RGB;

second means for calculating an RGBW signal corresponding to the case in which all the RGB input signals are the minimum value, based on an RGBW signal value for realizing target white when all the RGB input signals are a maximum value; and

third means for determining the RGBW signal by adding a signal corresponding to each RGB subtraction result to the RGBW signal calculated by the second means, each RGB subtraction result being calculated by the first means.

4. A signal processing circuit for a self-luminous type display, in which one pixel includes four unit pixels of RGBW, color filters are provided in the RGB unit pixels respectively, the color filter is not provided in the W unit pixel, and an RGBW signal value for realizing target white is set when all the RGB input signals are a maximum value, while white-side reference brightness of RGB is set such that the target white can be realized by only RGB when all the RGB input signals are the same value, the signal processing circuit comprising:

first means for subtracting a minimum value in RGB input signals from each input signal of RGB;

second means for calculating an RGBW signal corresponding to the case in which all the RGB input signals are the minimum value, based on an RGBW signal value for realizing target white when all the RGB input signals are a maximum value;

third means for determining the RGBW signal by adding a signal corresponding to each RGB subtraction result to the RGBW signal calculated by the second means, each RGB subtraction result being calculated by the first means;

fourth means for calculating the RGBW signal in the same manner as for the first means, the second means and the third means by setting the RGBW signal at an intermediate RGBW signal to regard the RGB signal in the intermediate RGBW signal as the RGB input signal, the RGBW signal being obtained by the third means, the fourth means generating the RGBW signal by adding the W signal in the intermediate RGBW signal to the W signal of the calculated RGBW signal, when the minimum value in the RGB signal in the RGBW signal calculated by the third means is not zero; and

fifth means for performing the same process as for the fourth means by setting the RGBW signal at the intermediate RGBW signal, the RGBW signal being obtained by the fourth means, when the minimum value in the RGB signal in the RGBW signal calculated by the fourth means is not zero.

5. A signal processing circuit for a self-luminous type display, in which one pixel includes four unit pixels of RGBW, color filters are provided in the RGB unit pixels respectively, and the color filter is not provided in the W unit pixel, the signal processing circuit comprising:

reverse gamma correction means for converting an RGB input signal into a pre-gamma correction RGB signal by performing reverse gamma correction to the RGB input signal, gamma correction being previously performed to the RGB input signal;

RGB-RGBW signal conversion means for setting the RGB signal at the RGB input signal to convert the RGB input signal into an RGBW signal, the RGB signal being obtained by the reverse gamma correction means; and

gamma correction means for performing the gamma correction to the RGBW signal according to the self-luminous type display, the RGBW signal being obtained by the RGB-RGBW signal conversion means, wherein an RGBW signal value for realizing target white is set when all the RGB input signals obtained by the reverse gamma correction means are a maximum value, while white-side reference brightness of RGB is set such that the target white can be realized by only RGB when all the RGB signals obtained by the reverse gamma correction means are the same value, and

the RGB-RGBW signal conversion means includes;

first means for subtracting a minimum value in RGB input signals from each input signal of RGB;

second means for calculating an RGBW signal corresponding to the case in which all the RGB input signals are the minimum value, based on an RGBW signal value for realizing target white when all the RGB input signals are a maximum value;

third means for determining the RGBW signal by adding a signal corresponding to each RGB subtraction result to the RGBW signal calculated by the second means, each RGB subtraction result being calculated by the first means;

fourth means for calculating the RGBW signal in the same manner as for the first means, the second means and the third means by setting the RGBW signal at an intermediate RGBW signal to regard the RGB signal in the intermediate RGBW signal as the RGB input signal, the RGBW signal being obtained by the third means, the fourth means generating the RGBW signal by adding the W signal in the intermediate RGBW signal to the W signal of the calculated RGBW signal, when the minimum value in the RGB signal in the RGBW signal calculated by the third means is not zero; and

fifth means for performing the same process as for the fourth means by setting the RGBW signal at the intermediate RGBW signal, the RGBW signal being obtained by the fourth means, when the minimum value in the RGB signal in the RGBW signal calculated by the fourth means is not zero.

6. A signal processing circuit for a self-luminous type display, in which one pixel includes four unit pixels of RGBW, color filters are provided in the RGB unit pixels respectively, the color filter is not provided in the W unit pixel, and an RGBW signal value for realizing target white is set when all the RGB input signals are a maximum value, while white-side reference brightness of RGB is set such that the target white can be realized by only RGB when all the RGB input signals are the same value, the signal processing circuit comprising:

first means for calculating a ratio of each signal value of RGB to the W signal value as each RGB feedback ratio, based on an RGBW signal value for realizing the target white when all the RGB input signals are the maximum value;

second means for calculating the sum of an infinite geometric series in each RGB, the RGB input signal being set at a first term, each RGB feedback ratio being set at a common ratio;

third means for subtracting a minimum value in the sum of the infinite geometric series from each input signal of RGB, the sum of the infinite geometric series being calculated in each RGB by the second means;

fourth means for calculating the RGBW signal corresponding to the case in which all the RGB input signals are the minimum value, based on the RGBW signal value for realizing the target white when all the RGB input signals are the maximum value; and

fifth means for determining the RGBW signal by adding a signal corresponding to each RGB subtraction result to the RGBW signal calculated by the fourth means, each RGB subtraction result being calculated by the third means.

7. A signal processing circuit for a self-luminous type display, in which one pixel includes four unit pixels of RGBW, color filters are provided in the RGB unit pixels respectively, and the color filter is not provided in the W unit pixel, the signal processing circuit comprising:

reverse gamma correction means for converting an RGB input signal into a pre-gamma correction RGB signal by performing reverse gamma correction to the RGB input signal, gamma correction being previously performed to the RGB input signal;

RGB-RGBW signal conversion means for setting the RGB signal at the RGB input signal to convert the RGB input signal into an RGBW signal, the RGB signal being obtained by the reverse gamma correction means; and

gamma correction means for performing the gamma correction to the RGBW signal according to the self-luminous type display, the RGBW signal being obtained by the RGB-RGBW signal conversion means, wherein an RGBW signal value for realizing target white is set when all the RGB signals obtained by the reverse gamma correction means are a maximum value, while white-side reference brightness of RGB is set such that the target white can be realized by only RGB when all the RGB input signals obtained by the reverse gamma correction means are the same value, and

the RGB-RGBW signal conversion means includes;

first means for calculating a ratio of each signal value of RGB to the W signal value as each RGB feedback ratio, based on an RGBW signal value for realizing the target white when all the RGB input signals are the maximum value;

second means for calculating the sum of an infinite geometric series in each RGB, the RGB input signal being set at a first term, each RGB feedback ratio being set at a common ratio;

third means for subtracting a minimum value in the sum of the infinite geometric series from each input signal of RGB, the sum of the infinite geometric series being calculated in each RGB by the second means;

fourth means for calculating the RGBW signal corresponding to the case in which all the RGB input signals are the minimum value, based on the RGBW signal value for realizing the target white when all the RGB input signals are the maximum value; and

fifth means for determining the RGBW signal by adding a signal corresponding to each RGB subtraction result to the RGBW signal calculated by the fourth means, each RGB subtraction result being calculated by the third means.

8. A signal processing method for a self-luminous type display, in which one pixel includes four unit pixels of RGBW, color filters are provided in the RGB unit pixels respectively, the color filter is not provided in the W unit pixel, and an RGBW signal value for realizing target white is set when all the RGB input signals are a maximum value, while white-side reference brightness of RGB is set such that the target white can be realized by only RGB when all the RGB input signals are the same value, the signal processing method comprising:

a first step of subtracting a minimum value in RGB input signals from each input signal of RGB;

a second step of calculating an RGBW signal corresponding to the case in which all the RGB input signals are the minimum value, based on an RGBW signal value for realizing target white when all the RGB input signals are a maximum value; and

a third step of determining the RGBW signal by adding a signal corresponding to each RGB subtraction result to the RGBW signal calculated in the second step, each RGB subtraction result being calculated in the first step.

9. A signal processing method for a self-luminous type display, in which one pixel includes four unit pixels of RGBW, color filters are provided in the RGB unit pixels respectively, and the color filter is not provided in the W unit pixel, the signal processing method comprising:

a reverse gamma correction step of converting an RGB input signal into a pre-gamma correction RGB signal by performing reverse gamma correction to the RGB input signal, gamma correction being previously performed to the RGB input signal;

an RGB-RGBW signal conversion step of setting the RGB signal at the RGB input signal to convert the RGB input signal into an RGBW signal, the RGB signal being obtained in the reverse gamma correction step; and

a gamma correction step of performing the gamma correction to the RGBW signal according to the self-luminous type display, the RGBW signal being obtained in the RGB-RGBW signal conversion step, wherein

an RGBW signal value for realizing target white is set when all the RGB input signals obtained in the reverse gamma correction step are a maximum value, while white-side reference brightness of RGB is set such that the target white can be realized by only RGB when all the RGB input signals obtained in the reverse gamma correction step are the same value, and

the RGB-RGBW signal conversion step includes;

a first step of subtracting a minimum value in RGB input signals from each input signal of RGB;

a second step of calculating an RGBW signal corresponding to the case in which all the RGB input signals are the minimum value, based on an RGBW signal value for realizing target white when all the RGB input signals are a maximum value; and

a third step of determining the RGBW signal by adding a signal corresponding to each RGB subtraction result to the RGBW signal calculated in the second step, each RGB subtraction result being calculated in the first step.

10. A signal processing method for a self-luminous type display, in which one pixel includes four unit pixels of RGBW, color filters are provided in the RGB unit pixels respectively, the color filter is not provided in the W unit pixel, and an RGBW signal value for realizing target white is set when all the RGB input signals are a maximum value, while white-side reference brightness of RGB is set such that the target white can be realized by only RGB when all the RGB input signals are the same value, the signal processing method comprising:

a first step of subtracting a minimum value in RGB input signals from each input signal of RGB;

a second step of calculating an RGBW signal corresponding to the case in which all the RGB input signals are the minimum value, based on an RGBW signal value for realizing target white when all the RGB input signals are a maximum value;

a third step of determining the RGBW signal by adding a signal corresponding to each RGB subtraction result to the RGBW signal calculated in the second step, each RGB subtraction result being calculated in the first step;

a fourth step of calculating the RGBW signal in the same manner as for the first step, the second step and the third step by setting the RGBW signal at an intermediate RGBW signal to regard the RGB signal in the intermediate RGBW signal as the RGB input signal, the RGBW signal being obtained in the third step, the fourth step generating the RGBW signal by adding the W signal in the intermediate RGBW signal to the W signal of the calculated RGBW signal, when the minimum value in the RGB signal in the RGBW signal calculated in the third step is not zero; and

a fifth step of performing the same process as for the fourth step by setting the RGBW signal at the intermediate RGBW signal, the RGBW signal being obtained in the fourth step, when the minimum value in the RGB signal in the RGBW signal calculated in the fourth step is not zero.

11. A signal processing method for a self-luminous type display, in which one pixel includes four unit pixels of RGBW, color filters are provided in the RGB unit pixels respectively, and the color filter is not provided in the W unit pixel, the signal processing method comprising:

a reverse gamma correction step of converting an RGB input signal into a pre-gamma correction RGB signal by performing reverse gamma-correction to the RGB input signal, gamma correction being previously performed to the RGB input signal;

an RGB-RGBW signal conversion step of setting the RGB signal at the RGB input signal to convert the RGB input signal into an RGBW signal, the RGB signal being obtained in the reverse gamma correction step; and

a gamma correction step of performing the gamma correction to the RGBW signal according to the self-luminous type display, the RGBW signal being obtained in the RGB-RGBW signal conversion step, wherein

an RGBW signal value for realizing target white is set when all the RGB signals obtained in the reverse gamma correction step are a maximum value, while white-side reference brightness of RGB is set such that the target white can be realized by only RGB when all the RGB input signals obtained in the reverse gamma correction step are the same value, and

the RGB-RGBW signal conversion step includes;

a first step of subtracting a minimum value in RGB input signals from each input signal of RGB;

a second step of calculating an RGBW signal corresponding to the case in which all the RGB input signals are the minimum value, based on an RGBW signal value for realizing target white when all the RGB input signals are a maximum value;

a third step of determining the RGBW signal by adding a signal corresponding to each RGB subtraction result to the RGBW signal calculated in the second step, each RGB subtraction result being calculated in the first step;

a fourth step of calculating the RGBW signal in the same manner as for the first step, the second step and the third step by setting the RGBW signal at an intermediate RGBW signal to regard the RGB signal in the intermediate RGBW signal as the RGB input signal, the RGBW signal being obtained in the third step, the fourth step generating the RGBW signal by adding the W signal in the intermediate RGBW signal to the W signal of the calculated RGBW signal, when the minimum value in the RGB signal in the RGBW signal calculated in the third step is not zero; and

a fifth step of performing the same process as for the fourth step by setting the RGBW signal at the intermediate RGBW signal, the RGBW signal being obtained in the fourth step, when the minimum value in the RGB signal in the RGBW signal calculated in the fourth step is not zero.

12. A signal processing method for a self-luminous type display, in which one pixel includes four unit pixels of RGBW, color filters are provided in the RGB unit pixels respectively, the color filter is not provided in the W unit pixel, and an RGBW signal value for realizing target white is set when all the RGB input signals are a maximum value, while white-side reference brightness of RGB is set such that the target white can be realized by only RGB when all the RGB input signals are the same value, the signal processing method comprising:

a first step of calculating a ratio of each signal value of RGB to the W signal value as each RGB feedback ratio, based on an RGBW signal value for realizing the target white when all the RGB input signals are the maximum value;

a second step of calculating the sum of an infinite geometric series in each RGB, the RGB input signal being set at a first term, each RGB feedback ratio being set at a common ratio;

a third step of subtracting a minimum value in the sum of the infinite geometric series from each input signal of RGB, the sum of the infinite geometric series being calculated in each RGB in the second step;

a fourth step of calculating the RGBW signal corresponding to the case in which all the RGB input signals are the minimum value, based on the RGBW signal value for realizing the target white when all the RGB input signals are the maximum value; and

a fifth step of determining the RGBW signal by adding a signal corresponding to each RGB subtraction result to the RGBW signal calculated in the fourth step, each RGB subtraction result being calculated in the third step.

13. A signal processing method for a self-luminous type display, in which one pixel includes four unit pixels of RGBW, color filters are provided in the RGB unit pixels respectively, and the color filter is not provided in the W unit pixel, the signal processing method comprising:

a reverse gamma correction step of converting an RGB input signal into a pre-gamma correction RGB signal by performing reverse gamma correction to the RGB input signal, gamma correction being previously performed to the RGB input signal;

an RGB-RGBW signal conversion step of setting the RGB signal at the RGB input signal to convert the RGB input signal into an RGBW signal, the RGB signal being obtained in the reverse gamma correction step; and

a gamma correction step of performing the gamma correction to the RGBW signal according to the self-luminous type display, the RGBW signal being obtained in the RGB-RGBW signal conversion step, wherein

an RGBW signal value for realizing target white is set when all the RGB input signals obtained in the reverse gamma correction step are a maximum value, while white-side reference brightness of RGB is set such that the target white can be realized by only RGB when all the RGB signals obtained in the reverse gamma correction step are the same value, and

the RGB-RGBW signal conversion step includes;

a first step of calculating a ratio of each signal value of RGB to the W signal value as each RGB feedback ratio, based on an RGBW signal value for realizing the target white when all the RGB input signals are the maximum value;

a second step of calculating the sum of an infinite geometric series in each RGB, the RGB input signal being set at a first term, each RGB feedback ratio being set at a common ratio;

a third step of subtracting a minimum value in the sum of the infinite geometric series from each input signal of RGB, the sum of the infinite geometric series being calculated in each RGB in the second step;

a fourth step of calculating the RGBW signal corresponding to the case in which all the RGB input signals are the minimum value, based on the RGBW signal value for realizing the target white when all the RGB input signals are the maximum value; and

a fifth step of determining the RGBW signal by adding a signal corresponding to each RGB subtraction result to the RGBW signal calculated in the fourth step, each RGB subtraction result being calculated in the third step.

14. A signal processing circuit for a self-luminous type display, in which one pixel includes four unit pixels of RGBX, an arbitrary color except for RGB is set at X, and an RGB signal value for realizing chromaticity and maximum brightness of X is set by an RGB signal, the signal processing circuit comprising:

RGB-RGBX signal conversion means for converting an RGB input signal into an RGBX signal, wherein

the RGB-RGBX signal conversion means includes;

first means for calculating an RGB signal component based on the RGB signal value for realizing chromaticity and maximum brightness of X such that at least one of RGB subtraction results becomes zero, when the RGB signal component is subtracted from the RGB input signal, the RGB signal component being able to be converted into the X signal from the RGB input signal;

second means for subtracting the RGB signal component from the RGB input signal to output the subtraction result as the RGB signal, the RGB signal component being calculated by the first means; and

third means for outputting the X signal corresponding to the RGB signal component calculated by the first means.

15. A signal processing circuit for a self-luminous type display, in which one pixel includes four unit pixels of RGBX and an arbitrary color except for RGB is set at X, the signal processing circuit comprising:

reverse gamma correction means for converting an RGB input signal into a pre-gamma correction RGB signal by performing reverse gamma correction to the RGB input signal, gamma correction being previously performed to the RGB input signal;

RGB-RGBX signal conversion means for setting the RGB signal at the RGB input signal to convert the RGB input signal into an RGBX signal, the RGB signal being obtained by the reverse gamma correction means; and

gamma correction means for performing the gamma correction to the RGBX signal according to the self-luminous type display, the RGBX signal being obtained by the RGB-RGBX signal conversion means, wherein

an RGB signal value for realizing chromaticity and maximum brightness of X is set by the RGB signal with respect to the pre-gamma correction RGB signal obtained by the reverse gamma correction means, and

the RGB-RGBX signal conversion means includes;

first means for calculating an RGB signal component based on the RGB signal value for realizing chromaticity and maximum brightness of X such that at least one of RGB subtraction results becomes zero, when the RGB signal component is subtracted from the RGB input signal, the RGB signal component being able to be converted into the X signal from the RGB input signal;

second means for subtracting the RGB signal component from the RGB input signal to output the subtraction result as the RGB signal, the RGB signal component being calculated by the first means; and

third means for outputting the X signal corresponding to the RGB signal component calculated by the first means.

16. A signal processing method for a self-luminous type display, in which one pixel includes four unit pixels of RGBX, an arbitrary color except for RGB is set at X, and an RGB signal value for realizing chromaticity and maximum brightness of X is set by an RGB signal, the signal processing method comprising:

an RGB-RGBX signal conversion step of converting an RGB input signal into an RGBX signal, wherein

the RGB-RGBX signal conversion step includes;

a first step of calculating an RGB signal component based on the RGB signal value for realizing chromaticity and maximum brightness of X such that at least one of RGB subtraction results becomes zero, when the RGB signal component is subtracted from the RGB input signal, the RGB signal component being able to be converted into the X signal from the RGB input signal;

a second step of subtracting the RGB signal component from the RGB input signal to output the subtraction result as the RGB signal, the RGB signal component being calculated in the first step; and

a third step of outputting the X signal corresponding to the RGB signal component calculated in the first step.

17. A signal processing method for a self-luminous type display, in which one pixel includes four unit pixels of RGBX and an arbitrary color except for RGB is set at X, the signal processing method comprising:

a reverse gamma correction step of converting an RGB input signal into a pre-gamma correction RGB signal by performing reverse gamma correction to the RGB input signal, gamma correction being previously performed to the RGB input signal;

an RGB-RGBX signal conversion step of setting the RGB signal at the RGB input signal to convert the RGB input signal into an RGBX signal, the RGB signal being obtained in the reverse gamma correction step; and

a gamma correction step of performing the gamma correction to the RGBX signal according to the self-luminous type display, the RGBX signal being obtained in the RGB-RGBX signal conversion step, wherein

an RGB signal value for realizing chromaticity and maximum brightness of X is set by the RGB signal with respect to the pre-gamma correction RGB signal obtained in the reverse gamma correction step, and

the RGB-RGBX signal conversion step includes;

a first step of calculating an RGB signal component based on the RGB signal value for realizing chromaticity and maximum brightness of X such that at least one of RGB subtraction results becomes zero, when the RGB signal component is subtracted from the RGB input signal, the RGB signal component being able to be converted into the X signal from the RGB input signal;

a second step of subtracting the RGB signal component from the RGB input signal to output the subtraction result as the RGB signal, the RGB signal component being calculated in the first step; and

a third step of outputting the X signal corresponding to the RGB signal component calculated in the first step.

18. A signal processing circuit for a self-luminous type display, in which one pixel includes five unit pixels of RGBWX, an arbitrary color except for RGBW is set at X, color filters are provided in the RGBX unit pixels respectively, the color filter is not provided in the W unit pixel, and an RGBW signal value for realizing target white is set when all the RGB input signals are a maximum value, and an RGB signal value for realizing chromaticity and maximum brightness of X by an RGB signal is set, while white-side reference brightness of RGB is set such that the target white can be realized by only RGB when all the RGB input signals are the same value, the signal processing circuit comprising:

RGB-RGBWX signal conversion means for converting the RGB input signal into an RGBWX signal, wherein

the RGB-RGBWX signal conversion means includes;

first means for subtracting a minimum value in RGB input signals from each input signal of RGB;

second means for calculating an RGBW signal corresponding to the case in which all the RGB input signals are the minimum value, based on an RGBW signal value for realizing target white when all the RGB input signals are a maximum value;

third means for determining a first R signal, a first G signal, a first B signal, and a W signal by adding a signal corresponding to each RGB subtraction result to the RGBW signal calculated by the second means, each RGB subtraction result being calculated by the first means;

fourth means for calculating an RGB signal component based on the RGB signal value for realizing chromaticity and maximum brightness of X by the RGB signal such that at least one of RGB subtraction results becomes zero when the RGB signal component is subtracted from the first R signal, the first G signal, and the first B signal, the RGB signal component being able to be converted into an X signal from the first R signal, the first G signal, and the first B signal obtained by the third means;

fifth means for calculating a second R signal, a second G signal, and a second B signal by subtracting the RGB signal component from the first R signal, the first G signal, and the first B signal, the RGB signal component being obtained by the first means;

sixth means for calculating the X signal corresponding to the RGB signal component calculated by the fourth means; and

seventh means for outputting the W signal, the second R signal, the second G signal, the second B signal, and the X signal as the RGBWX signal corresponding to the RGB input signal, the W signal being obtained by the third means, the second R signal, the second G signal, and the second B signal being obtained by the fifth means, the X signal being obtained by the sixth means.

19. A signal processing circuit for a self-luminous type display, in which one pixel includes five unit pixels of RGBWX, an arbitrary color except for RGBW is set at X, color filters are provided in the RGBX unit pixels respectively, and the color filter is not provided in the W unit pixel, the signal processing circuit comprising:

reverse gamma correction means for converting an RGB input signal into a pre-gamma correction RGB signal by performing reverse gamma correction to the RGB input signal, gamma correction being previously performed to the RGB input signal;

RGB-RGBWX signal conversion means for setting the RGB signal at the RGB input signal to convert the RGB input signal into an RGBWX signal, the RGB signal being obtained by the reverse gamma correction means; and

gamma correction means for performing the gamma correction to the RGBWX signal according to the self-luminous type display, the RGBWX signal being obtained by the RGB-RGBWX signal conversion means, wherein an RGBW signal value for realizing target white is set when all the RGB input signals obtained by the reverse gamma correction means are a maximum value, and an RGB signal value for realizing chromaticity and maximum brightness of X by the RGB signal obtained by the reverse gamma correction means is set, while white-side reference brightness of RGB is set such that the target white can be realized by only RGB when all the RGB input signals obtained by the reverse gamma correction means are the same value, and

the RGB-RGBWX signal conversion means includes;

first means for subtracting a minimum value in RGB input signals from each input signal of RGB;

second means for calculating an RGBW signal corresponding to the case in which all the RGB input signals are the minimum value, based on an RGBW signal value for realizing target white when all the RGB input signals are a maximum value;

third means for determining a first R signal, a first G signal, a first B signal, and a W signal by adding a signal corresponding to each RGB subtraction result to the RGBW signal calculated by the second means, each RGB subtraction result being calculated by the first means;

fourth means for calculating an RGB signal component based on the RGB signal value for realizing chromaticity and maximum brightness of X by the RGB signal such that at least one of RGB subtraction results becomes zero when the RGB signal component is subtracted from the first R signal, the first G signal, and the first B signal, the RGB signal component being able to be converted into an X signal from the first R signal, the first G signal, and the first B signal obtained by the third means;

fifth means for calculating a second R signal, a second G signal, and a second B signal by subtracting the RGB signal component from the first R signal, the first G signal, and the first B signal, the RGB signal component being obtained by the first means;

sixth means for calculating the X signal corresponding to the RGB signal component calculated by the fourth means; and

seventh means for outputting the W signal, the second R signal, the second G signal, the second B signal, and the X signal as the RGBWX signal corresponding to the RGB input signal, the W signal being obtained by the third means, the second R signal, the second G signal, and the second B signal being obtained by the fifth means, the X signal being obtained by the sixth means.

20. A signal processing method for a self-luminous type display, in which one pixel includes five unit pixels of RGBWX, an arbitrary color except for RGBW is set at X, color filters are provided in the RGBX unit pixels respectively, the color filter is not provided in the W unit pixel, and an RGBW signal value for realizing target white is set when all the RGB input signals are a maximum value, and an RGB signal value for realizing chromaticity and maximum brightness of X by an RGB signal is set, while white-side reference brightness of RGB is set such that the target white can be realized by only RGB when all the RGB input signals are the same value, the signal processing method comprising:

an RGB-RGBWX signal conversion step of converting the RGB input signal into an RGBWX signal, wherein

the RGB-RGBWX signal conversion step includes;

a first step of subtracting a minimum value in RGB input signals from each input signal of RGB;

a second step of calculating an RGBW signal corresponding to the case in which all the RGB input signals are the minimum value, based on an RGBW signal value for realizing target white when all the RGB input signals are a maximum value;

a third step of determining a first R signal, a first G signal, a first B signal, and a W signal by adding a signal corresponding to each RGB subtraction result to the RGBW signal calculated in the second step, each RGB subtraction result being calculated in the first step;

a fourth step of calculating an RGB signal component based on the RGB signal value for realizing chromaticity and maximum brightness of X by the RGB signal such that at least one of RGB subtraction results becomes zero when the RGB signal component is subtracted from the first R signal, the first G signal, and the first B signal, the RGB signal component being able to be converted into an X signal from the first R signal, the first G signal, and the first B signal obtained in the third step;

a fifth step of calculating a second R signal, a second G signal, and a second B signal by subtracting the RGB signal component from the first R signal, the first G signal, and the first B signal, the RGB signal component being obtained in the first step;

a sixth step of calculating the X signal corresponding to the RGB signal component calculated in the fourth step; and

a seventh step of outputting the W signal, the second R signal, the second G signal, the second B signal, and the X signal as the RGBWX signal corresponding to the RGB input signal, the W signal being obtained in the third step, the second R signal, the second G signal, and the second B signal being obtained in the fifth step, the X signal being obtained in the sixth step.

21. A signal processing method for a self-luminous type display, in which one pixel includes five unit pixels of RGBWX, an arbitrary color except for RGBW is set at X, color filters are provided in the RGBX unit pixels respectively, and the color filter is not provided in the W unit pixel, the signal processing method comprising:

a reverse gamma correction step of converting an RGB input signal into a pre-gamma correction RGB signal by performing reverse gamma correction to the RGB input signal, gamma correction being previously performed to the RGB input signal;

an RGB-RGBWX signal conversion step of setting the RGB signal at the RGB input signal to convert the RGB input signal into an RGBWX signal, the RGB signal being obtained in the reverse gamma correction step; and

a gamma correction step of performing the gamma correction to the RGBWX signal according to the self-luminous type display, the RGBWX signal being obtained in the RGB-RGBWX signal conversion step, wherein

an RGBW signal value for realizing target white is set when all the RGB input signals obtained in the reverse gamma correction step are a maximum value, and an RGB signal value for realizing chromaticity and maximum brightness of X by the RGB signal obtained in the reverse gamma correction step is set, while white-side reference brightness of RGB is set such that the target white can be realized by only RGB when all the RGB signals obtained in the reverse gamma correction step are the same value, and

the RGB-RGBWX signal conversion step includes;

a first step of subtracting a minimum value in RGB input signals from each input signal of RGB;

a second step of calculating an RGBW signal corresponding to the case in which all the RGB input signals are the minimum value, based on an RGBW signal value for realizing target white when all the RGB input signals are a maximum value;

a third step of determining a first R signal, a first G signal, a first B signal, and a W signal by adding a signal corresponding to each RGB subtraction result to the RGBW signal calculated in the second step, each RGB subtraction result being calculated in the first step;

a fourth step of calculating an RGB signal component based on the RGB signal value for realizing chromaticity and maximum brightness of X by the RGB signal such that at least one of RGB subtraction results becomes zero when the RGB signal component is subtracted from the first R signal, the first G signal, and the first B signal, the RGB signal component being able to be converted into an X signal from the first R signal, the first G signal, and the first B signal obtained in the third step;

a fifth step of calculating a second R signal, a second G signal, and a second B signal by subtracting the RGB signal component from the first R signal, the first G signal, and the first B signal, the RGB signal component being obtained in the first step;

a sixth step of calculating the X signal corresponding to the RGB signal component calculated in the fourth step; and

a seventh step of outputting the W signal, the second R signal, the second G signal, the second B signal, and the X signal as the RGBWX signal corresponding to the RGB input signal, the W signal being obtained in the third step, the second R signal, the second G signal, and the second B signal being obtained in the fifth step, the X signal being obtained in the sixth step.