WO2012077564A1

WO2012077564A1 - Image processing device, display device comprising same, image processing method, image processing program, and recording medium recording same

Info

Publication number: WO2012077564A1
Application number: PCT/JP2011/077773
Authority: WO
Inventors: 勇司田中
Original assignee: シャープ株式会社
Priority date: 2010-12-08
Filing date: 2011-12-01
Publication date: 2012-06-14

Abstract

An objective of the present invention is to provide an image processing device for display with which it is possible to generate display data for displaying a clearly visible image on a display unit. The brightness value of each sub-display pixel which configures display pixels (P1_1 - P1_3) is derived as a weighted average value based on the brightness value of an input pixel which is associated with the sub-display pixel and a weighting coefficient which is set to a sub-base pixel of the same primary color as the primary color of the sub-display pixel from among either the first base pixels (IN1_1, IN1_3, IN1_5, IN1_7) or the second base pixels (IN1_2, IN1_4, IN1_6) corresponding to the associated input pixel. The weighting coefficient is based on the primary colors and the proportion of the brightness values between sub-base pixels for sub-base pixels which configure the first and second base pixels. The display data of the display image is generated by carrying out such a process for each display pixel. It is thus possible to avoid color noise in edge components of images, and thus to display a clearly visible image.

Description

Image processing device, display device including the same, image processing method, image processing program, and recording medium recording the same

The present invention relates to an image processing device, a display device including the same, an image processing method, an image processing program, and a recording medium recording the same, and in particular, display data for displaying a highly visible image on a display unit. Display image processing device suitable for generation, display device including the same, display image processing method suitable for generation of highly visible image data, image processing program for causing computer to execute the method, and image processing program The present invention relates to a recording medium on which is recorded.

Conventionally, a technique for displaying an image such as a character on a display device with two types of brightness of black and white is known. FIG. 26 shows an input image (hatched line) given to the display device. The hatched portion of this input image is white, and the other portions are black. 27 to 29 show an example in which the input image (shaded line) shown in FIG. 26 is displayed by the conventional display method in the color image display device. The color image display device is, for example, a sub-pixel forming unit (hereinafter referred to as “R sub-pixel forming unit”) that forms a red (hereinafter referred to as “R”) sub-pixel (hereinafter referred to as “R sub-pixel”). , A sub-pixel forming portion (hereinafter referred to as “G sub-pixel forming portion”) for forming a green (hereinafter referred to as “G”) sub-pixel (hereinafter referred to as “G sub-pixel”), and a blue color (hereinafter referred to as “B”). )) Subpixels (hereinafter referred to as “B subpixels”) constitute a single pixel forming portion (hereinafter referred to as “B subpixel forming portion”). 27 to 29, an arrow located at the upper left of the image indicates a direction in which a scanning signal line provided in the display device extends (hereinafter referred to as “horizontal direction”) and a direction in which a data signal line provided in the display device extends (hereinafter referred to as “ Vertical direction). Further, a portion partitioned by a solid line indicates a pixel, and a portion partitioned by a broken line indicates a subpixel. Further, a column number (representing the pixel position in the horizontal direction) is assigned to the outside of the upper end of the image, and a row number (representing the position of the pixel in the vertical direction) is assigned to the outside of the left end of the image. Furthermore, R, G, and B representing the colors indicated by the corresponding sub-pixels are attached outside the upper end of the image. Furthermore, the sub-pixels of intermediate gradation are shown by hatching. The same reference arrows, numbers, and the like are attached to the images and input images displayed on the display device referred to below. However, explanations of these arrows, numbers, and the like are omitted here.

The luminance value in this specification is a value normalized so that the maximum value (for example, 255) is 1. Therefore, the range that the luminance value can take in this specification is 0-1. Further, in this specification, the number of pixels arranged in the horizontal direction, the number of sub-pixels, the number of pixel forming portions, and the number of sub-pixel forming portions are respectively referred to as “the number of horizontal pixels”, “the number of horizontal sub-pixels”, It is referred to as “the number of horizontal pixel formation portions” and “the number of horizontal subpixel formation portions”.

In the conventional display method shown in FIG. 27, an image is generated by a subpixel forming unit in which the luminance value of the subpixel to be formed is set to 0 and a subpixel forming unit in which the luminance value of the subpixel to be formed is set to 0.5. Display is performed. The oblique line is expressed as a connection of line segments of one pixel unit composed of the R subpixel, the G subpixel, and the B subpixel having a luminance value of 0.5. In this way, since an image is displayed for each pixel forming portion, a large jaggy (unevenness of the edge portion of the image) occurs. Therefore, the diagonal line shown in FIG. 27 does not appear as a smooth diagonal line to human eyes.

On the other hand, in the conventional display method in FIG. 28, an image is formed by a subpixel forming unit in which the luminance value of the subpixel to be formed is set to 0 and a subpixel forming unit in which the luminance value of the subpixel to be formed is set to 1. Is displayed. A diagonal line is expressed by joining the line segment of the G sub-pixel having the luminance value 1 and the line segment composed of the B sub-pixel and the R sub-pixel having the luminance value 1. As a result, jaggy is reduced, and display with high resolution becomes possible. However, the conventional display method in FIG. 28 has a problem that coloring (also referred to as “color noise”) occurs at the edge of the image even though the original image is monochrome. For example, when attention is paid to the line segment of the G subpixel having the luminance value 1, the luminance values of the right and left R subpixels and B subpixels are zero. For this reason, the line segment of the G sub-pixel having the luminance value 1 is colored green. When attention is paid to a line segment composed of a B subpixel and an R subpixel having a luminance value of 1, the luminance values of the left and right G subpixels are zero. Therefore, the line segment composed of the B subpixel and the R subpixel having the luminance value 1 is colored magenta. As described above, although the original image is black and white, the edge portion of the image is colored and recognized. Such conventional display methods are disclosed in, for example, Patent Document 1, Patent Document 2, and the like (hereinafter referred to as “Patent Document 1,” etc.).

Therefore, in the conventional display method in FIG. 29, for example, a subpixel forming unit in which the luminance value is set to 0, a subpixel forming unit in which the luminance value is set to 0.1, and a subpixel in which the luminance value is set to 0.25 An image is displayed by the forming unit, the sub-pixel forming unit with the luminance value set to 0.4, and the sub-pixel forming unit with the luminance value set to 1. In this conventional display method, diagonal lines are expressed by joining two types of line segments. That is, the first line segment includes a B subpixel and an R subpixel having a luminance value of 0.4, a G subpixel having a luminance value of 0.25 located on the left and right of the B subpixel and the R subpixel, and the G subpixel. It is formed by an R subpixel and a B subpixel having a luminance value of 0.1 located on the left and right of the subpixel. The second line segment includes an R subpixel and a G subpixel having a luminance value of 0.4, a B subpixel having a luminance value of 0.25 located on the left and right of the R subpixel and the G subpixel, and B It is formed by a G subpixel and a R subpixel having a luminance value of 0.1 located on the left and right of the subpixel. Thereby, coloring of the edge part of an image can be suppressed. However, there is a problem that the line width becomes thick and the resolution becomes low. Such a conventional display method is disclosed in Patent Document 3, for example.

By the way, conventionally, in a color image display device, a method of displaying an image having a larger number of horizontal pixels, that is, a higher resolution than the number of horizontal pixel formation portions of the color display device using a sub-pixel forming portion is known. FIG. 30 shows an input image (character “A”, 5 × 10 in pixel units, 5 × 30 in subpixel units) given to the display device. FIG. 31 shows an example in which the input image shown in FIG. 30 is displayed by a conventional display method in an RGB three-primary color image display device (5 × 5 in pixel units and 5 × 15 in subpixel units). In this display method, two pixels arranged in the horizontal direction of the input image are set as one pixel pair. If the luminance value of two pixels of this pixel pair is 0, the luminance value of one pixel (three subpixels) corresponding to this is set to 0 in the display device. Further, if the luminance value of one pixel is 0 and the luminance value of the other pixel is 1 in this pixel pair, the luminance value of one pixel (three sub-pixels) corresponding to this is set in the display device. 0.5. Furthermore, if the luminance value of two pixels in this pixel pair is 1, the luminance value of one pixel (three sub-pixels) corresponding to this is set to 1 in the display device. FIG. 32 shows an input shown in FIG. 30 by a conventional display method in an RGB and yellow (hereinafter referred to as “Y”) four primary color image display device (5 × 5 in pixel units and 5 × 20 in subpixel units). The example which displayed the image is shown. The display method in FIG. 32 is the same as the display method in FIG.

Further, as a display method for displaying an image having a larger number of horizontal pixels than the number of horizontal pixel formation portions of the display device, there is a method disclosed in the above-mentioned Patent Document 1. FIG. 33 shows an input image (character “A”, 5 × 15 in pixel units, 5 × 45 in subpixel units) given to the display device. FIG. 34 shows an example in which the input image shown in FIG. 34 is displayed by the conventional display method in an RGB three-primary color image display device (5 × 5 in pixel units and 5 × 15 in subpixel units). In this display method, display is performed by assigning one pixel of the image shown in FIG. 33 to one sub-pixel forming portion of the display device.

Japanese Unexamined Patent Publication No. 2002-91369 Japanese Unexamined Patent Publication No. 2004-4839 Japanese Unexamined Patent Publication No. 2001-100725

As described above, a large jaggy occurs in the conventional display method in FIG. 27, and in the conventional display method in FIG. 28, although the original image is monochrome, the edge of the image is colored, and FIG. However, the conventional display method has a problem that the line width becomes thick and the resolution becomes low. In addition, the display method in FIGS. 31 and 32 has a problem that the image displayed on the display device is asymmetrical in the left and right directions although the input image is symmetrical. Further, in the conventional display method shown in FIG. 34, in the line segment composed of the R sub-pixel and G sub-pixel having the luminance value 1, yellow colored CNy is changed to the B sub-unit having the luminance value 1 in the same manner as described above with reference to FIG. A magenta colored CNm is generated in a line segment composed of pixels and R subpixels, and a cyan colored CNc is generated in a line segment composed of G subpixels and B subpixels having a luminance value of 1. Therefore, there is a problem that the edge of the image is colored although the original image is monochrome. Thus, in any conventional display method, there is a problem that the visibility of the display image is lowered.

Therefore, the present invention provides a display image processing device capable of generating display data for displaying a highly visible image on a display unit, a display device including the display data, an image processing method, an image processing program, and recording the same. An object of the present invention is to provide a recording medium.

A first aspect of the present invention includes a plurality of pixel forming portions for forming a plurality of display pixels constituting a display image based on a predetermined number of primary colors, and a predetermined number of subpixels corresponding to the predetermined number of primary colors An image processing device that generates display data for displaying the display image on a display unit in which each pixel forming unit is formed by a forming unit,
An input unit that acquires an input image in which the resolution in the direction in which the predetermined number of sub-pixel forming units are arranged in each pixel forming unit is higher than the display image;
Of the plurality of input pixels constituting the input image, one of the input pixels adjacent to each other in the direction in which the predetermined number of sub-basic pixels are arranged in each pixel forming unit is a first basic pixel including a predetermined number of sub-basic pixels, The other is made to correspond to a second basic pixel composed of a predetermined number of sub-basic pixels, and each of the predetermined number of sub-display pixels constituting each display pixel is set as at least one input pixel based on the first and second basic pixels. Associating the luminance value of each sub display pixel with the luminance value of the associated input pixel and the sub display of the sub basic pixels in the first or second basic pixel corresponding to the associated input pixel A calculation unit for obtaining a weighted average value based on a weighting factor set in advance for a sub basic pixel of the same primary color as the primary color of the pixel,
The primary color of each of the sub basic pixels constituting each of the first and second basic pixels and the ratio of the luminance value between the sub basic pixels are preset, and the correspondence to the input pixel of each sub display pixel The setting of the weighting factor for each sub-basic pixel in the first and second basic pixels means that the primary color and the luminance value of the sub-basic pixel constituting each of the first and second basic pixels are It is based on the setting of the ratio.

According to a second aspect of the present invention, in the first aspect of the present invention,
The first basic pixel includes three sub basic pixels,
The second basic pixel includes four sub basic pixels,
A primary color with high visual sensitivity is set as the primary color of the sub basic pixel located in the center among the three sub basic pixels in the first basic pixel,
A primary color having high visual sensitivity is set as a primary color of the sub basic pixel located at both ends of the four sub basic pixels in the second basic pixel.

According to a third aspect of the present invention, in the second aspect of the present invention,
The primary color having high visual sensitivity is green.

According to a fourth aspect of the present invention, in the third aspect of the present invention,
Each display pixel is configured by sequentially arranging a red sub-display pixel, a green sub-display pixel, and a blue sub-display pixel,
The first basic pixel is configured by sequentially arranging a red sub-basic pixel, a green sub-basic pixel, and a blue sub-basic pixel,
The second basic pixel is configured by sequentially arranging a first green sub-basic pixel, a blue sub-basic pixel, a red sub-basic pixel, and a second green sub-basic pixel,
The weighting factor set for the red sub-basic pixel, the green sub-basic pixel, and the blue sub-basic pixel in the first basic pixel is 0.5,
The weighting factor set for the second green sub-basic pixel, the second blue sub-basic pixel, the second red sub-basic pixel, and the third green sub-basic pixel Are 0.25, 0.5, 0.5, and 0.25, respectively.
The computing unit is
The luminance value of the red sub-display pixel is set to the luminance value of the two input pixels associated with each other, and the red sub-basic pixel in the first basic pixel corresponding to one of the two input pixels associated with each other. As a weighted average value based on the weighting factor set for and the weighting factor set for the red sub-basic pixel in the second basic pixel corresponding to the other,
The luminance value of the green sub-display pixel is set to the luminance value of the three input pixels associated with each other and the first basic pixel corresponding to the first input pixel among the three input pixels associated with each other. The weighting factor set for the green sub-basic pixel, the weighting factor set for the first green sub-basic pixel in the second basic pixel corresponding to the second input pixel, and a third input A weighted average value based on the weighting factor set for the second green sub-basic pixel corresponding to the pixel,
The luminance value of the blue sub-display pixel is set to the luminance value of the two input pixels associated with each other, and the blue sub-basic pixel in the first basic pixel corresponding to one of the two input pixels associated with each other. And a weighted average value based on the weighting factor set for the blue sub-basic pixel in the second basic pixel corresponding to the other.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention,
The red sub-basic pixel in the first basic pixel, the green sub-basic pixel, and the green sub-basic pixel associated with the input pixel located at the extreme end in the direction in which the predetermined number of sub-pixel formation portions are arranged in each pixel formation portion; The weighting factors set for the blue sub-basic pixels are 1, 0.75, and 0.5, respectively.

According to a sixth aspect of the present invention, in the first aspect of the present invention,
The first basic pixel and the second basic pixel are composed of three sub basic pixels,
A primary color having high visual sensitivity is set as a primary color of a sub basic pixel located in the center among the three sub basic pixels in the first basic pixel and the second basic pixel.

A seventh aspect of the present invention is the sixth aspect of the present invention,
The primary color having high visual sensitivity is green.

According to an eighth aspect of the present invention, in the seventh aspect of the present invention,
Each display pixel is configured by sequentially arranging a red sub-display pixel, a first green sub-display pixel, a blue sub-display pixel, and a second green sub-display pixel,
The first basic pixel is configured by sequentially arranging a red sub-basic pixel, a green sub-basic pixel, and a blue sub-basic pixel,
The second basic pixel is configured by sequentially arranging a blue sub-basic pixel, a green sub-basic pixel, and a red sub-basic pixel.
The weighting factors set for the red sub-basic pixel, the green sub-basic pixel, and the blue sub-basic pixel in the first basic pixel are 0.5, 1, and 0.5, respectively.
The weighting factors set for the blue sub-basic pixel, the green sub-basic pixel, and the red sub-basic pixel in the second basic pixel are 0.5, 1, and 0.5, respectively.
The computing unit is
The luminance value of the red sub-display pixel is set to the luminance value of the two input pixels associated with each other, and the red sub-basic pixel in the first basic pixel corresponding to one of the two input pixels associated with each other. As a weighted average value based on the weighting factor set for and the weighting factor set for the red sub-basic pixel in the second basic pixel corresponding to the other,
The luminance value of the first green sub-display pixel is set to the luminance value of the associated input pixel and the green sub-basic pixel in the first basic pixel corresponding to the associated input pixel. Obtained as a weighted average value based on the set weighting factor,
The luminance value of the blue sub-display pixel is set to the luminance value of the two input pixels associated with each other, and the blue sub-basic pixel in the first basic pixel corresponding to one of the two input pixels associated with each other. As a weighted average value based on the weighting factor set for and the weighting factor set for the blue sub-basic pixel in the second basic pixel corresponding to the other,
The luminance value of the second green sub-display pixel is set to the luminance value of the associated input pixel and the green sub-basic pixel in the second basic pixel corresponding to the associated input pixel. It is obtained as a weighted average value based on the set weight coefficient.

According to a ninth aspect of the present invention, in the first aspect of the present invention,
The first basic pixel includes three sub basic pixels,
The second basic pixel includes two sub basic pixels,
A first primary color having high visual sensitivity is set as the primary color of the sub basic pixel located in the center among the three sub basic pixels in the first basic pixel,
A second primary color having high visual sensitivity is set as one primary color of the two sub basic pixels in the second basic pixel.

According to a tenth aspect of the present invention, in a ninth aspect of the present invention,
The first primary color with high visual sensitivity is green;
The second primary color having high visual sensitivity is yellow.

An eleventh aspect of the present invention is the tenth aspect of the present invention,
Each display pixel is configured by sequentially arranging a red sub-display pixel, a green sub-display pixel, a blue sub-display pixel, and a yellow sub-display pixel.
The first basic pixel is configured by sequentially arranging a red sub-basic pixel, a green sub-basic pixel, and a blue sub-basic pixel,
The second basic pixel is configured by sequentially arranging a blue sub basic pixel and a yellow sub basic pixel,
The weighting factors set for the red sub-basic pixel, the green sub-basic pixel, and the blue sub-basic pixel in the first basic pixel are 1, 1, and 0.5, respectively.
The weighting factors set for the blue sub-basic pixel and the yellow sub-basic pixel in the second basic pixel are 0.5 and 1, respectively.
The computing unit is
The luminance value of the red sub-display pixel is set with respect to the luminance value of the associated input pixel and the red sub-basic pixel in the first basic pixel corresponding to the associated input pixel. Obtained as a weighted average value based on the weighting factor,
The luminance value of the green sub-display pixel is set for the luminance value of the associated input pixel and the green sub-basic pixel in the first basic pixel corresponding to the associated input pixel. Obtained as a weighted average value based on the weighting factor,
The luminance value of the blue sub-display pixel is set to the luminance value of the two input pixels associated with each other, and the blue sub-basic pixel in the first basic pixel corresponding to one of the two input pixels associated with each other. As a weighted average value based on the weighting factor set for and the weighting factor set for the blue sub-basic pixel in the second basic pixel corresponding to the other,
The luminance value of the yellow sub-display pixel is set for the luminance value of the associated input pixel and the yellow sub-basic pixel in the second basic pixel corresponding to the associated input pixel. It is obtained as a weighted average value based on the weight coefficient.

According to a twelfth aspect of the present invention, in the first aspect of the present invention,
The computing unit is
The luminance value of each sub display pixel is the primary color of the sub display pixel among the luminance value of the associated input pixel and the sub basic pixel in the first or second basic pixel corresponding to the associated input pixel. Before obtaining a weighted average value based on a weighting factor set in advance for the sub-basic pixels of the same primary color, and converting the luminance value of each input pixel to have a linear relationship with the luminance in the display unit,
For the sub-basic pixel of the same primary color as the primary color of the sub-display pixel among the sub-basic pixels in the first or second basic pixel corresponding to the correlated input pixel and the luminance value of the associated input pixel The luminance value of each sub display pixel obtained as a weighted average value based on a preset weighting factor is converted into a value corresponding to the gamma characteristic of the display unit.

A thirteenth aspect of the present invention is a display device,
An image processing apparatus according to any one of the first aspect to the twelfth aspect of the present invention is provided.

A fourteenth aspect of the present invention includes a plurality of pixel forming portions for forming a plurality of display pixels constituting a display image based on a predetermined number of primary colors, and a predetermined number of subpixels corresponding to the predetermined number of primary colors. An image processing method for generating display data for displaying the display image on a display unit in which each pixel forming unit is formed by a forming unit,
Obtaining an input image in which the resolution in the direction in which the predetermined number of sub-pixel forming units are arranged in each pixel forming unit is higher than the display image;
Of the plurality of input pixels constituting the input image, one of the input pixels adjacent to each other in the direction in which the predetermined number of sub-basic pixels are arranged in each pixel forming unit is a first basic pixel including a predetermined number of sub-basic pixels, The other is made to correspond to a second basic pixel composed of a predetermined number of sub-basic pixels, and each of the predetermined number of sub-display pixels constituting each display pixel is set as at least one input pixel based on the first and second basic pixels. Associating the luminance value of each sub display pixel with the luminance value of the associated input pixel and the sub display of the sub basic pixels in the first or second basic pixel corresponding to the associated input pixel Obtaining a weighted average value based on a weighting factor set in advance for a sub-basic pixel of the same primary color as the primary color of the pixel,
The primary color of each of the sub basic pixels constituting each of the first and second basic pixels and the ratio of the luminance value between the sub basic pixels are preset, and the correspondence to the input pixel of each sub display pixel The setting of the weighting factor for each sub-basic pixel in the first and second basic pixels means that the primary color and the luminance value of the sub-basic pixel constituting each of the first and second basic pixels are It is based on the setting of the ratio.

A fifteenth aspect of the present invention is the fourteenth aspect of the present invention,
The first basic pixel includes three sub basic pixels,
The second basic pixel includes four sub basic pixels,
A primary color with high visual sensitivity is set as the primary color of the sub basic pixel located in the center among the three sub basic pixels in the first basic pixel,
A primary color having high visual sensitivity is set as a primary color of the sub basic pixel located at both ends of the four sub basic pixels in the second basic pixel.

A sixteenth aspect of the present invention is the fourteenth aspect of the present invention,
The first basic pixel and the second basic pixel are composed of three sub basic pixels,
A primary color having high visual sensitivity is set as a primary color of a sub basic pixel located in the center among the three sub basic pixels in the first basic pixel and the second basic pixel.

A seventeenth aspect of the present invention is the fourteenth aspect of the present invention,
The first basic pixel includes three sub basic pixels,
The second basic pixel includes two sub basic pixels,
A first primary color having high visual sensitivity is set as the primary color of the sub basic pixel located in the center among the three sub basic pixels in the first basic pixel,
A second primary color having high visual sensitivity is set as one primary color of the two sub basic pixels in the second basic pixel.

An eighteenth aspect of the present invention is the fourteenth aspect of the present invention,
The luminance value of each sub display pixel is the primary color of the sub display pixel among the luminance value of the associated input pixel and the sub basic pixel in the first or second basic pixel corresponding to the associated input pixel. Converting the luminance value of each input pixel to have a linear relationship with the luminance in the display unit before obtaining a weighted average value based on a weighting factor set in advance for sub-basic pixels of the same primary color as
For the sub-basic pixel of the same primary color as the primary color of the sub-display pixel among the sub-basic pixels in the first or second basic pixel corresponding to the correlated input pixel and the luminance value of the associated input pixel Converting the luminance value of each sub-display pixel obtained as a weighted average value based on a preset weighting factor into a value corresponding to the gamma characteristic of the display unit.

A nineteenth aspect of the present invention is an image processing program,
A computer is caused to execute each step in the image processing method according to any one of the fourteenth aspect to the eighteenth aspect of the present invention.

A twentieth aspect of the present invention is a computer-readable recording medium,
An image processing program according to the nineteenth aspect of the present invention is recorded.

According to the first aspect of the present invention, it is possible to display a binary image having a number of horizontal pixels exceeding the number of horizontal pixel forming portions of the display device on the color image display portion while preventing coloring of the edge portion of the image. it can. Thereby, a highly visible binary image can be displayed on a display part.

According to the second aspect, the sixth aspect, and the ninth aspect of the present invention, since the basic pixel is configured according to the configuration of the pixel forming unit in the display unit, the edge portion of the image is appropriately colored. Can be prevented. Thereby, an image with higher visibility can be displayed on the display unit.

According to the third aspect of the present invention, the same effect as in the second aspect of the present invention can be achieved when the primary color with high visual sensitivity is green.

According to the fourth aspect of the present invention, basic pixels and weighting coefficients corresponding to the three primary colors RGB are used. Thereby, in the RGB three primary color image display device, an image with higher visibility can be displayed on the display unit.

According to the fifth aspect of the present invention, the display pixels in the first column can be prevented from becoming darker than desired. Thereby, a favorable display quality can be maintained.

According to the seventh aspect of the present invention, the same effect as in the sixth aspect of the present invention can be achieved when the primary color with high visual sensitivity is green.

According to the eighth aspect of the present invention, basic pixels and weighting factors corresponding to the four primary colors of RGBG are used. Thereby, in the RGBG four-primary color image display device, an image with higher visibility can be displayed on the display unit.

According to the tenth aspect of the present invention, when the first primary color with high visual sensitivity is green and the second primary color with high visual sensitivity is yellow, the same effect as in the ninth aspect of the present invention is obtained. Can be played.

According to the eleventh aspect of the present invention, basic pixels and weighting factors corresponding to the four primary colors RGBY are used. Accordingly, in the RGBY four-primary color image display device, an image with higher visibility can be displayed on the display unit.

According to the twelfth aspect of the present invention, display data is generated in consideration of gamma characteristics. As a result, an image with higher visibility and good display quality can be displayed on the display unit.

According to the thirteenth aspect of the present invention, since a high-resolution image can be displayed on a low-resolution display device, the number of pixel formation portions of the display device can be reduced compared to other display devices that display an image with the same resolution. In addition, low power consumption can be achieved by improving the transmittance.

It is a figure which shows the example of a display of the image (diagonal line) based on the ratio of the luminance value in a 1st basic examination. It is a figure which shows the example of a display of the image (diagonal line) based on the ratio of the luminance value in a 2nd basic examination. It is a figure which shows the example of a display of the image (diagonal line) based on the ratio of the luminance value in a 3rd basic examination. 1 is a schematic diagram illustrating an electrical configuration of a liquid crystal display device according to a first embodiment of the present invention. It is a block diagram which shows the structure of the image processing apparatus in the said 1st Embodiment. (A) is a figure which shows the structure of the 1st basic pixel in the said 1st Embodiment. FIG. 4B is a diagram illustrating a configuration of a second basic pixel in the first embodiment. It is a flowchart which shows the calculation process in the said 1st Embodiment. It is a figure which shows the correspondence of the pixel in the said 1st Embodiment. It is a figure which shows the display image (character "A") in the said 1st Embodiment. It is a figure which shows the correspondence of the pixel of the 4th line in FIG. It is a block diagram which shows the structure of the image processing apparatus in the 1st modification of the said 1st Embodiment. It is a figure which shows the correspondence of the pixel in the 2nd modification of the said 1st Embodiment. It is a schematic diagram which shows the electrical constitution of the liquid crystal display device which concerns on the 2nd Embodiment of this invention. (A) is a figure which shows the structure of the 1st basic pixel in the said 2nd Embodiment. FIG. 6B is a diagram illustrating a configuration of a second basic pixel in the second embodiment. It is a figure which shows the correspondence of the pixel in the said 2nd Embodiment. It is a figure which shows the display image (character "A") in the said 2nd Embodiment. It is a figure which shows the correspondence of the pixel of the 4th line in FIG. It is a schematic diagram which shows the electrical constitution of the liquid crystal display device which concerns on the 3rd Embodiment of this invention. (A) is a figure which shows the structure of the 1st basic pixel in the said 3rd Embodiment. FIG. 7B is a diagram illustrating a configuration of a second basic pixel in the third embodiment. It is a figure which shows the correspondence of the pixel in the said 3rd Embodiment. It is a figure which shows the display image (character "A") in the said 3rd Embodiment. It is a figure which shows the correspondence of the pixel of the 4th line in FIG. It is a flowchart which shows the calculation process in the 4th Embodiment of this invention. It is a figure which shows the display image (character "A") in the said 4th Embodiment. It is a block diagram which shows the structure of the image processing apparatus in the modification of the said 4th Embodiment. It is a figure which shows the input image (diagonal line) given to a display apparatus. It is a figure which shows the example of a display of the image (diagonal line) by the conventional display method. It is a figure which shows the example of a display of the image (diagonal line) by the conventional display method. It is a figure which shows the example of a display of the image (diagonal line) by the conventional display method. It is a figure which shows the input image (character "A") given to a display apparatus. It is a figure which shows the example of a display of the image (character "A") by the conventional display method in a 3 primary color display device. It is a figure which shows the example of a display of the image (character "A") by the conventional display method in 4 primary color display apparatus. It is a figure which shows the input image (character "A") given to a display apparatus. It is a figure which shows the example of a display of the image (character "A") by the conventional display method in a 3 primary color display device.

<1. Basic study>
Before describing the embodiment of the present invention, a basic study made by the present inventor to solve the above problems will be described.

<1.1 First basic study>
In the first basic study, image display in a display device in which one pixel forming unit is configured by an R subpixel forming unit, a G subpixel forming unit, and a B subpixel forming unit will be considered. In this display device, when the luminance value of the display data and the luminance value that will actually be displayed are in a linear relationship, an edge portion of an image displayed on the display device (hereinafter referred to as “display image”) is displayed. Colors disappear when the pixels constituting the display image are “luminance value of R subpixel: luminance value of G subpixel: luminance value of B subpixel = 1: 1: 1” or “first G subpixel. : Luminance value of B subpixel: luminance value of R subpixel: luminance value of second G subpixel = 0.5: 1: 1: 0.5 ”.

FIG. 1 is a diagram showing an example in which the image (shaded line) shown in FIG. 26 is displayed based on the ratio of the two luminance values described above. As shown in FIG. 1, the image includes black (luminance value 0), intermediate color (luminance value 0.5), and white (luminance value 1) subpixels. According to the display shown in FIG. 1, a large jaggy as in the display example shown in FIG. 27 does not occur. Further, the coloring of the edge portion of the image as in the display example shown in FIG. 28 does not occur. Furthermore, the line width does not become large as in the display example shown in FIG.

From the above first basic study, in the display device in which one pixel forming unit is configured by the R subpixel forming unit, the G subpixel forming unit, and the B subpixel forming unit, “the luminance value of the R subpixel: G subpixel luminance value: B subpixel luminance value = 1: 1: 1 ”and“ first G subpixel: B subpixel luminance value: R subpixel luminance value: second G subpixel luminance value ” It was found that an image with high visibility can be displayed by correcting the luminance value based on the ratio of “luminance value = 0.5: 1: 1: 0.5”.

<1.2 Second basic study>
In the second basic study, in the display device in which one pixel formation unit is configured by the R subpixel formation unit, the first G subpixel formation unit, the B subpixel formation unit, and the second G subpixel formation unit. Consider image display. When the gamma correction is performed, the edge portion of the input image is not colored. The pixel constituting the display image is “the luminance value of the R subpixel: the luminance value of the first G subpixel: the luminance of the B subpixel. Value = 0.5: 1: 0.5 ”or“ B sub-pixel luminance value: second G sub-pixel luminance value: R sub-pixel luminance value = 0.5: 1: 0.5 ”ratio It was a case where it was constituted based on.

FIG. 2 is a diagram showing an example in which the image (shaded line) shown in FIG. 26 is displayed based on the ratio of the two luminance values described above. As shown in FIG. 2, the image includes black (luminance value 0), intermediate color (luminance value 0.5), and white (luminance value 1) subpixels. According to the display shown in FIG. 2, a large jaggy like the display example shown in FIG. 27 does not occur. Further, the coloring of the edge portion of the image as in the display example shown in FIG. 28 does not occur. Furthermore, the line width does not become large as in the display example shown in FIG.

From the above second basic study, a display in which one pixel forming portion is constituted by the R subpixel forming portion, the first G subpixel forming portion, the B subpixel forming portion, and the second G subpixel forming portion. In the apparatus, “luminance value of R subpixel: luminance value of first G subpixel: luminance value of B subpixel = 0.5: 1: 0.5” and “luminance value of B subpixel: second By correcting the luminance value based on the ratio of luminance value of G subpixel: luminance value of R subpixel = 0.5: 1: 0.5, an image with high visibility can be displayed. I understood.

<1.3 Third basic study>
In the third basic study, an R subpixel forming unit, a G subpixel forming unit, a B subpixel forming unit, and a subpixel forming unit (hereinafter referred to as “Y subpixel”) for forming Y (hereinafter referred to as “Y subpixel”). Let us consider image display in a display device in which one pixel formation unit is configured by “Y sub-pixel formation unit”. When the gamma correction is performed, the edge portion of the input image is not colored because the pixel constituting the display image is “R subpixel luminance value: G subpixel luminance value: B subpixel luminance value = 1. 1: 0.5 ”or“ B sub-pixel luminance value: Y sub-pixel luminance value = 0.5: 1 ”.

FIG. 3 is a diagram showing an example in which the image (shaded line) shown in FIG. 26 is displayed based on the ratio of the above two luminance values. As shown in FIG. 3, the image is composed of black (luminance value 0), intermediate color (luminance value 0.5), and white (luminance value 1) subpixels. According to the display shown in FIG. 3, a large jaggy as in the display example shown in FIG. 27 does not occur. Further, the coloring of the edge portion of the image as in the display example shown in FIG. 28 does not occur. Furthermore, the line width does not become large as in the display example shown in FIG.

From the above third basic study, in the display device in which one pixel forming unit is configured by the R sub-pixel forming unit, the G sub-pixel forming unit, the B sub-pixel forming unit, and the Y sub-pixel forming unit, “R Sub-pixel luminance value: G sub-pixel luminance value: B sub-pixel luminance value = 1: 1: 0.5 and “B sub-pixel luminance value: Y sub-pixel luminance value = 0.5: 1” It was found that an image with high visibility can be displayed by correcting the luminance value based on the ratio.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings based on the first basic examination, the second basic examination, and the third basic examination.

<2. First Embodiment>
<2.1 Overall configuration of liquid crystal display device>
The present embodiment is based on the first basic study. FIG. 4 is a schematic diagram showing an electrical configuration of the liquid crystal display device 100 according to the first embodiment of the present invention. As shown in FIG. 4, a display unit 10, a display control unit 20, a scanning signal line drive circuit 30, a data signal line drive circuit 40, and an image processing device 50 are provided. The liquid crystal display device 100 is configured to display a color image based on the three primary colors R, G, and B. That is, in the liquid crystal display device 100, one display pixel is configured by sequentially arranging the R sub display pixel, the G sub display pixel, and the B sub display pixel. The liquid crystal display device 100 is a liquid crystal display device for personal computers, for example. Note that the image processing device 50 may be provided not in the liquid crystal display device 100 but in a personal computer, for example.

The display unit 10 includes n data signal lines LD1 to LDn, m scanning signal lines LG1 to LGm, TFTs 13 provided corresponding to the intersections of the data signal lines LD1 to LDn and the scanning signal lines LG1 to LGm, And pixel electrodes connected to the data signal lines LD1 to LDn via the TFTs 13. In FIG. 4, “R”, “G”, and “B” are attached to the pixel electrode corresponding to the R subpixel, the pixel electrode corresponding to the G subpixel, and the pixel electrode corresponding to the B subpixel, respectively. Hereinafter, they are referred to as “R pixel electrode”, “G pixel electrode”, and “B pixel electrode”, respectively. An R subpixel forming portion 12R is formed by the TFT 13, the R pixel electrode, a common electrode (not shown) opposed to the TFT 13, and a liquid crystal filled between the R pixel electrode and the common electrode. Similarly, the G sub-pixel forming portion 12G is formed by the TFT 13, the G pixel electrode, the common electrode opposed thereto, and the liquid crystal filled between the G pixel electrode and the common electrode, and the TFT 13, B pixel electrode, The B subpixel forming portion 12B is formed by the common electrode facing the B and the liquid crystal filled between the B pixel electrode and the common electrode. Further, the R subpixel formation unit 12R, the G subpixel formation unit 12G, and the B subpixel formation unit 12B arranged in the horizontal direction constitute one pixel formation unit. Hereinafter, the pixel formation portion located in the i-th row and j-th column is referred to as “pixel formation portion Pi_j”. In the following, the pixel formed by the pixel formation portion Pi_j may also be denoted by “Pi_j”.

The display control unit 20 receives the display data O_DAT from the image processing device 50 and the timing control signal TS from the outside, and receives the image signal DV, the data start pulse SSP, the data clock signal SCK, the gate start pulse GSP, and the gate clock signal GCK. Generate. The data start pulse SSP, the data clock signal SCK, the gate start pulse GSP, and the gate clock signal GCK are timing signals for controlling the timing for displaying an image on the display unit 10. The image signal DV, the data start pulse SSP, and the data clock signal SCK are supplied to the data signal line driving circuit 40, and the gate start pulse GSP and the gate clock signal GCK are supplied to the scanning signal line driving circuit 30.

The scanning signal line drive circuit 30 receives the gate start pulse GSP and the gate clock signal GCK from the display control unit 20, and sets the scanning signal lines LG1 to LGm to the selected state or the non-selected state to the scanning signal lines LG1. Apply to ~ LGm.

The data signal line drive circuit 40 receives the image signal DV, the data start pulse SSP, and the data clock signal SCK from the display control unit 20, and charges the pixel capacitance formed by the pixel electrode and the counter electrode of each subpixel formation unit. Data signals D1 to Dn to be applied are applied to the data signal lines LD1 to LDn. The data signals D1 to Dn are taken into the subpixel formation portion when the TFT in the subpixel formation portion corresponding to the scanning signal line in the selected state is turned on.

The voltage corresponding to the luminance value of the sub-pixel to be formed by the sub-pixel forming unit is determined by the liquid crystal capacitance formed by the pixel electrode and the counter electrode in the sub-pixel forming unit based on the data signal captured by the sub-pixel forming unit. Is charged. An image is displayed on the display unit 10 by changing the light transmittance with respect to the liquid crystal layer according to the charging voltage.

<2.2 Configuration of image processing apparatus>
FIG. 5 is a block diagram illustrating a configuration of the image processing apparatus 50. As illustrated in FIG. 5, the image processing apparatus 50 includes a CPU 501 as an arithmetic unit, an input interface 502, a main storage device 503, an auxiliary storage device 504, and an output unit 505. The CPU 501, the input interface 502, the main storage device 503, the auxiliary storage device 504, and the output unit 505 are connected by a bus. The auxiliary storage device 504 stores font data FD indicating character font information corresponding to the display data I_DAT, and an image processing program PG that causes the CPU 501 to execute each step in generation of display data O_DAT described later. The CPU 501 controls the entire image processing apparatus 50, reads the font data FD and the image processing program PG stored in the auxiliary storage device 504, and executes the image processing program PG. The main storage device 503 temporarily stores font data FD, the image processing program PG, and display data O_DAT generated by the CPU 501. The display data O_DAT is temporarily stored in the main storage device 503 and then given to the display control unit 20 via the output unit 505. Here, as the auxiliary storage device 504, for example, a recording medium such as a hard disk, a CD-ROM, a DVD-ROM, and an IC card can be used. Further, the font data FD and the image processing program PG may be acquired not from the auxiliary storage device 504 but from a communication network.

In the present embodiment, basic pixels that are virtual pixels are used to generate a display image. The basic pixel is composed of a plurality of sub basic pixels. Hereinafter, the R sub-basic pixel is referred to as “R sub-basic pixel”, the G sub-basic pixel is referred to as “G sub-basic pixel”, and the B sub-basic pixel is referred to as “B sub-basic pixel”.

There are two types of basic pixels in the present embodiment: a first basic pixel shown in FIG. 6A and a second basic pixel shown in FIG. Here, the primary colors of the sub basic pixels constituting the first basic pixel and the second basic pixel are set from the primary colors of the sub display pixels constituting the display pixel in the present embodiment, that is, R, G, and B. ing. That is, from the left side of FIG. 6A, the first basic pixel is an R sub basic pixel as a red sub basic pixel, a G sub basic pixel as a green (primary color with high visual sensitivity), and a blue sub pixel. B sub-basic pixels as sub-basic pixels are arranged in order. On the other hand, the second basic pixel is a G sub-basic pixel (hereinafter referred to as “left-end G sub-basic pixel”) as the first green (primary color with high visual sensitivity) sub-basic pixel from the left side of FIG. , A B sub-basic pixel as a blue sub-basic pixel, an R sub-basic pixel as a red sub-basic pixel, and a G sub-basic pixel as a second green (primary color with high visual sensitivity) "Right end G sub-basic pixels") are arranged in order. Data defining the configurations of the first basic pixel and the second basic pixel (hereinafter referred to as “basic pixel data”) is stored in advance in the auxiliary storage device 504, for example, but is stored in advance in the main storage device 503. May be included in the image processing program PG.

The basic pixel data includes a luminance value ratio based on the first basic study. That is, the ratio of the luminance value between the sub basic pixels in the first basic pixel is “the luminance value of the R sub pixel: the luminance value of the G sub pixel: the luminance value of the B sub pixel = 1: 1: 1”, the second basic pixel The ratio between the sub-basic pixels is “the first G sub-pixel: the luminance value of the B sub-pixel: the luminance value of the R sub-pixel: the luminance value of the second G sub-pixel = 0.5: 1: 1: 0. 5 "is preset. Further, the basic pixel data includes a weighting factor set in advance for each of the sub basic pixels in the first and second basic pixels. This weighting factor is based on the ratio between the primary color and the luminance value for the sub basic pixels constituting each of the first and second basic pixels. Specifically, the weighting coefficient is a number assigned to each sub basic pixel in FIGS. 6 (A) and 6 (B). That is, the weighting factor set for the R sub-basic pixel, the G sub-basic pixel, and the B sub-basic pixel in the first basic pixel is 0.5, and the left end G sub-basic pixel and B sub-basic pixel in the second basic pixel , R sub-basic pixels, and right end G sub-basic pixels are 0.25, 0.5, 0.5, and 0.25, respectively. That is, the weighting factor is set so that the sum of the weighting factors set for the sub basic pixels in the basic pixel corresponding to each sub display pixel described later becomes 1.

<2.3 Display data generation method>
FIG. 7 is a flowchart (A1 to A5) showing calculation processing for generating display data in this embodiment. Hereinafter, a display image generation method will be described based on this flowchart.

First, display data I_DAT indicating code data is input to the input interface 502 (A1).

Next, the CPU 501 reads font data FD, an image processing program PG, and basic pixel data corresponding to the display data I_DAT from the auxiliary storage device 504 to the main storage device 503 (A2).

Next, the CPU 501 expands the font data FD, the image processing program PG, and the basic pixel data in the main memory 503 (A3). Here, the CPU 501 converts the code data into binary image data (hereinafter referred to as “input image”) using the font data FD. That is, an input unit is realized by the CPU 501, the input interface 502, the main storage device 503, and the auxiliary storage device 504. The display data I_DAT itself may be input image data. In this case, the input interface 502 functions as an input unit. Here, the input image is composed of a plurality of pixels (hereinafter referred to as “input pixels”).

Next, the CPU 501 sets one of the input pixels adjacent to each other in the horizontal direction, that is, the input pixel located in the odd-numbered column (1, 3, 5,...) As the first basic pixel, that is, the even-numbered column ( 2, 4, 6,...) Are associated with the second basic pixel (A 4). Further, the CPU 501 associates each of the R sub-display pixel, the G sub-display pixel, and the B sub-display pixel constituting each display pixel with at least one input pixel based on the first and second basic pixels (A4). . FIG. 8 is a diagram showing the correspondence between such pixels. Here, IN1_1 to IN1_7 indicate basic pixels in the first row and the first column to the first row and seventh column, respectively, and P1_1 to P1_3 indicate display pixels in the first row and the first column to the first row and third column, respectively. Furthermore, the number given to each sub basic pixel indicates a weighting factor set for the sub basic pixel. In the following, for example, “basic pixel IN1_3” and “first basic pixel IN1_3” may be used interchangeably. Similarly, for example, “basic pixel IN1_4” and “second basic pixel IN1_4” may be used interchangeably.

More specifically, the CPU 501 inputs the input pixels in the first row, first column, first row, third column, first row, fifth column, and first row, seventh column as first basic pixels IN1_1, IN1_3, IN1_5, and IN1_7, respectively. The input pixels in the first row, second column, first row, fourth column, and first row, sixth column correspond to the second basic pixels IN1_2, IN1_4, and IN1_6, respectively. Further, as shown in FIG. 8, the CPU 501 associates the R sub display pixel in the display pixel (for example, P1_3) with the R sub basic pixel in the first basic pixel IN1_5 and the R sub basic pixel in the second basic pixel IN1_4. That is, the CPU 501 associates the R sub-display pixel in the display pixel P1_3 with the input pixel in the first row and fifth column and the first row and fourth column. Further, the CPU 501 changes the G sub display pixel in the display pixel P1_3 to the G sub basic pixel in the first basic pixel IN1_5, the left end G sub basic pixel in the second basic pixel IN1_6, and the right end G sub basic pixel in the second basic pixel IN1_4. Associate. That is, the CPU 501 associates the G sub-display pixel in the display pixel P1_3 with the input pixels in the first row, fifth column, the first row, sixth column, and the first row, fourth column. Furthermore, the CPU 501 associates the B sub display pixel in the display pixel P1_3 with the B sub basic pixel in the first basic pixel IN1_5 and the B sub basic pixel in the second basic pixel IN1_6. That is, the CPU 501 associates the B sub display pixel in the display pixel P1_3 with the input pixel in the first row, the fifth column, and the first row, the sixth column.

Next, the CPU 501 determines the luminance value of each sub display pixel from the luminance value of the input pixel associated with the sub display pixel and the first or second basic pixel corresponding to the associated input pixel. It is obtained as a weighted average value based on the weight coefficient set for the sub basic pixel of the same primary color as the primary color of the sub display pixel (A5). More specifically, as shown in FIG. 8, the CPU 501 determines the luminance value of the R sub display pixel in the display pixel (for example, P1_3) for the input pixels in the first row, fifth column, and first row, fourth column. The luminance value, the weight coefficient (0.5) set for the R sub-basic pixel in the first basic pixel IN1_5 and the second basic pixel IN1_4 corresponding to the input pixels in the first row and fifth column and the first row and fourth column, respectively. It is obtained as a weighted average value based on the weight coefficient (0.5) set for the R sub-basic pixel. In addition, the CPU 501 determines the luminance value of the G sub display pixel in the display pixel P1_3, the luminance value of the input pixel in the first row, fifth column, first row, sixth column, and first row, fourth column, and one row. The weighting factor (0.5) and the second basic pixel IN1_6 set for the G sub basic pixel in the first basic pixel IN1_5 corresponding to the input pixels in the fifth column, the first row, the sixth column, and the first row, the fourth column, respectively. Is obtained as a weighted average value based on the weighting factor (0.25) set for the left-end G sub-basic pixel and the weighting factor (0.25) set for the right-end G sub-basic pixel in the second basic pixel IN1_4. Further, the CPU 501 determines the luminance value of the B sub display pixel in the display pixel P1_3, the luminance value of the input pixel in the first row, fifth column, and first row, sixth column, the first row, fifth column, and first row, six. The weighting factor (0.5) set for the B sub-basic pixel in the first basic pixel IN1_5 and the weighting factor (0...) Set for the B sub-basic pixel in the second basic pixel IN1_6 respectively corresponding to the input pixels in the column. As a weighted average value based on 5). Thus, the display pixel P1_3 is obtained. Display data O_DAT of a display image is generated by performing such processing for each display pixel. The display data O_DAT is temporarily stored in the main storage device 503 and then given to the display control unit 20.

FIG. 9 shows a display image displayed on the display unit 10 when the input image (character “A”, 5 × 10 in pixel units, 5 × 30 in subpixel units) shown in FIG. 30 is given in this embodiment. (Character 'A', 5 × 5 in pixel units, 5 × 15 in subpixel units). The number of horizontal pixels of the input image shown in FIG. 30 is twice the number of horizontal pixels of the display image shown in FIG. When the number of horizontal pixels of the input image is the same as the number of horizontal pixels of the display image, for example, the CPU 501 performs processing such as making the number of horizontal pixels of the input image twice the number of horizontal pixels of the display image. Also good.

FIG. 10 is a diagram showing the correspondence relationship of the pixels in the fourth row in FIG. The number given to each sub basic pixel is different from FIG. 8 and represents the product of the weighting factor set for the sub basic pixel and the luminance value of the input pixel corresponding to the sub basic pixel. Here, the description will be made by paying attention to the display pixel P4_2. The CPU 501 determines the luminance value of the R sub-display pixel in the display pixel P4_2 as the luminance value (1) of the input pixel in the fourth row and third column and the luminance value (0) of the input pixel in the fourth row and second column. The weighting factor (0.5) set for the R sub-basic pixel in the first basic pixel IN4_3 and the R sub-basic in the second basic pixel IN4_2 respectively corresponding to the input pixels in the fourth row and third column and the fourth row and second column It is obtained as a weighted average value based on the weighting factor (0.5) set for the pixel. That is, the luminance value of the R sub display pixel in the display pixel P4_2 is 0.5 (= (1 × 0.5 + 0 × 0.5) / (0.5 + 0.5)). Further, the CPU 501 sets the luminance value of the G sub display pixel in the display pixel P4_2 to the luminance value (1) of the input pixel in the 4th row and 3rd column and the luminance value (1) of the input pixel in the 4th row and 4th column. ) And the luminance value (0) of the input pixel in the 4th row and the 2nd column, and the first basic pixel IN4_3 corresponding to the input pixel in the 4th row, the 3rd column, the 4th row, the 4th column, and the 4th row, 2nd column, respectively The weighting factor (0.5) set for the G sub-basic pixel, the weighting factor (0.25) set for the leftmost G sub-basic pixel in the second basic pixel IN4_4, and the G sub-basic pixel in the second basic pixel IN4_2 Is obtained as a weighted average value with the weighting coefficient (0.25) set to. That is, the luminance value of the G sub display pixel in the display pixel P4_2 is 0.75 (= (1 × 0.5 + 1 × 0.25 + 0 × 0.25) / (0.5 + 0.25 + 0.25)). Further, the CPU 501 sets the luminance value of the B sub display pixel in the display pixel P4_2 to the luminance value (1) of the input pixel in the fourth row and third column and the luminance value (1) of the input pixel in the fourth row and fourth column. ), The weight coefficient (0.5) set for the B sub-basic pixel in the first basic pixel IN4_3 and the B in the second basic pixel IN4_4 respectively corresponding to the input pixels in the fourth row and third column and the fourth row and fourth column It is obtained as a weighted average value based on the weighting factor (0.5) set for the sub basic pixel. That is, the luminance value of the B sub display pixel in the display pixel P4_2 is 1 (= (1 × 0.5 + 1 × 0.5) / (0.5 + 0.5)). By performing such processing for each display pixel and each row, the display image shown in FIG. 9 is obtained.

In the display image shown in FIG. 9, there is no large jaggy as in the display example shown in FIG. Further, in the display image shown in FIG. 9, the edge portion of the image is not colored as in the display examples shown in FIGS. Furthermore, unlike the display examples shown in FIGS. 31 and 32, the display image shown in FIG. 9 is bilaterally symmetric like the input image shown in FIG.

<2.4 Effect>
According to the present embodiment, it is possible to display a binary image having the number of horizontal pixels exceeding the number of horizontal pixel forming portions of the liquid crystal display device while preventing coloring of the edge portion of the image. Thereby, a binary image with high visibility can be displayed. In addition, since a high-resolution image can be displayed on a low-resolution display device, the number of pixel formation portions of the display device can be reduced as compared with other display devices that display an image with the same resolution, and the transmittance is improved due to an improvement in transmittance. Power consumption can be reduced.

Further, according to the present embodiment, basic pixels and weighting factors corresponding to the three primary colors of RGB are used. Thereby, an image with higher visibility can be displayed in the RGB three primary color image display device.

<2.5 First Modification>
The liquid crystal display device according to the first modification of the first embodiment is, for example, a liquid crystal television. Among the constituent elements of this modification, the same elements as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. FIG. 11 is a block diagram showing the configuration of the image processing apparatus 51 in this modification. The image processing apparatus 51 in the present modification includes a weighting circuit 511, a multiplication circuit 514, an array circuit 217, an addition circuit 521, an input terminal TI as an input unit, and an output terminal TO. The weighting circuit 511, the multiplication circuit 514, the array circuit 217, and the addition circuit 521 correspond to a calculation unit. In this modification, each process performed by the CPU 501 in the first embodiment is performed by each circuit.

The image processing device 51 receives display data I_DAT from the input terminal TI. Display data I_DAT is applied to weighting circuit 511 and multiplication circuit 514. The weighting circuit 511 outputs a signal indicating a preset weighting factor based on the received display data I_DAT. A signal indicating the weight coefficient is supplied to the multiplication circuit 514. The multiplication circuit 514 obtains the product of the luminance value of the input pixel and the weighting coefficient based on the received display data I_DAT and the signal indicating the weighting coefficient, and outputs a signal indicating information on the product. A signal indicating the product information is supplied to the array circuit 517. The array circuit 517 includes, for example, a delay circuit. The array circuit 517 associates pixels by delaying a signal indicating given product information, and outputs a signal indicating delayed product information. A signal indicating the delayed product information is supplied to the adder circuit 521. The adder circuit 521 obtains a luminance value of each sub display pixel by adding a signal indicating information on the delayed product, and outputs the luminance value as display data O_DAT through the output terminal TO. Thus, steps A4 and A5 in the first embodiment are realized by the weighting circuit 511, the multiplication circuit 514, the array circuit 217, and the addition circuit 521. As in the first embodiment, as a result, the luminance value of each display pixel is the luminance value of the input pixel associated with the sub-display pixel and the first or the corresponding pixel corresponding to the input pixel. It is obtained as a weighted average value based on the weighting factor set for the sub basic pixel of the same primary color as the primary color of the sub display pixel among the second basic pixels.

According to the present modification, the same effect as that of the first embodiment can be obtained by configuring the image processing apparatus with a circuit.

<2.6 Second Modification>
FIG. 12 is a diagram illustrating a correspondence relationship of pixels in the second modification example of the first embodiment. Here, IN1_1 to IN1_7 indicate basic pixels in the first row and the first column to the first row and seventh column, respectively, and P1_1 to P1_3 indicate display pixels in the first row and the first column to the first row and third column, respectively. Furthermore, the number given to each sub basic pixel indicates a weighting factor set for the sub basic pixel. In this modification, the weighting factor preset for the sub basic pixel is different from that of the first embodiment. That is, unlike the first embodiment, the weighting factors preset for the R sub-basic pixel, the G sub-basic pixel, and the B sub-basic pixel in each basic pixel in the first column are 1, 0.75, respectively. , And 0.5. Therefore, the sum of the weighting factors set for the basic pixels corresponding to the sub display pixels (particularly, the R sub display pixel and the G sub display pixel) in the display pixels in the first column is 1 as in the other columns.

According to this modification, it is possible to prevent the display pixels in the first column from becoming darker than desired. Thereby, a favorable display quality can be maintained.

<3. Second Embodiment>
<3.1 Overall configuration of liquid crystal display device>
This embodiment is based on the second basic study. FIG. 13 is a schematic diagram showing an electrical configuration of the liquid crystal display device 110 according to the second embodiment of the present invention. In addition, about the component same as 1st Embodiment among the components of this embodiment, the same referential mark is attached | subjected and description is abbreviate | omitted. The liquid crystal display device 110 is configured to display a color image based on four primary colors of R, first G, B, and second G. That is, in the liquid crystal display device 110, one pixel is configured by sequentially arranging the R sub-display pixel, the first G sub-display pixel, the B sub-display pixel, and the second G sub-display pixel. In the following description, the first G and the second G may be simply referred to as “G” without being distinguished from each other.

The configuration of the image processing apparatus 50 in the present embodiment is the same as that in the first embodiment. Further, the configuration of the image processing apparatus 50 in the present embodiment may be the same as that of the first modification of the first embodiment.

There are two types of basic pixels in the present embodiment: a first basic pixel shown in FIG. 14A and a second basic pixel shown in FIG. Here, the primary colors of the sub basic pixels constituting the first basic pixel and the second basic pixel are set from the primary colors of the sub display pixels constituting the display pixel in the present embodiment, that is, R, G, and B. ing. That is, from the left side of FIG. 14A, the first basic pixel is an R sub basic pixel as a red sub basic pixel, a G sub basic pixel as a green (primary color with high visual sensitivity), and a blue sub pixel. B sub-basic pixels as sub-basic pixels are arranged in order. On the other hand, from the left side of FIG. 14B, the second basic pixel is a B sub basic pixel as a blue sub basic pixel, a G sub basic pixel as a green (primary color with high visual sensitivity), and a red color. R sub-basic pixels as the sub-basic pixels are arranged in order. The basic pixel data is stored in advance in the auxiliary storage device 504, for example, but may be stored in advance in the main storage device 503, or may be included in the image processing program PG.

The basic pixel data includes a luminance value ratio based on the second basic study. That is, the ratio of the luminance value between the sub basic pixels in the first basic pixel is expressed as “R sub pixel luminance value: first G sub pixel luminance value: B sub pixel luminance value = 0.5: 1: 0. 5 ”, and the ratio between the sub-basic pixels in the second basic pixel is“ B sub-pixel luminance value: second G sub-pixel luminance value: R sub-pixel luminance value = 0.5: 1: 0.5 ”. Is preset. Further, the basic pixel data includes a weighting factor set in advance for each of the sub basic pixels in the first and second basic pixels. This weighting factor is based on the ratio between the primary color and the luminance value for the sub basic pixels constituting each of the first and second basic pixels. Specifically, the weighting coefficient is a number assigned to each sub basic pixel in FIGS. 14 (A) and 14 (B). That is, the weighting factors set for the R sub-basic pixel, the G sub-basic pixel, and the B sub-basic pixel in the first basic pixel are 0.5, 1, and 0.5, respectively. The weighting factors set for the sub basic pixel, the G sub basic pixel, and the R sub basic pixel are 0.5, 1, and 0.5, respectively. That is, the weighting factor is set so that the sum of the weighting factors set for the sub basic pixels in the basic pixel corresponding to each sub display pixel described later becomes 1.

In this embodiment, only the weighting factors set in advance for the R sub-basic pixel, the G sub-basic pixel, and the B sub-basic pixel in each basic pixel in the first column are 1, 1, and 0.5, respectively. is there. For this reason, the sum of the weighting factors set for the basic pixels corresponding to the sub-display pixels (particularly, the R sub-display pixel) in the display pixels in the first column is 1 as in the other columns.

<3.2 Display data generation method>
Also in the present embodiment, similarly to the first embodiment, calculation processing for generating display data is performed based on the flowchart (A1 to A5) shown in FIG. Since steps A1 to A3 in the present embodiment are the same as steps A1 to A3 in the first embodiment, description thereof is omitted.

The CPU 501 sets the input pixel located in one of the input pixels adjacent to each other in the horizontal direction, that is, the odd-numbered columns (1, 3, 5,...) As the first basic pixel, that is, the even-numbered columns (2, 4). , 6,...) Correspond to the second basic pixel (A4). Further, the CPU 501 determines each of the R sub-display pixel, the first G sub-display pixel, the B sub-display pixel, and the second G sub-display pixel constituting each display pixel based on the first and second basic pixels. Corresponding to at least one input pixel (A4). FIG. 15 is a diagram showing the correspondence between such pixels. Here, IN1_1 to IN1_7 indicate basic pixels in the first row and the first column to the first row and seventh column, respectively, and P1_1 to P1_3 indicate display pixels in the first row and the first column to the first row and third column, respectively. Furthermore, the number given to each sub basic pixel indicates a weighting factor set for the sub basic pixel. In the following, for example, “basic pixel IN1_3” and “first basic pixel IN1_3” may be used interchangeably. Similarly, for example, “basic pixel IN1_4” and “second basic pixel IN1_4” may be used interchangeably.

More specifically, the CPU 501 inputs the input pixels in the first row, first column, first row, third column, first row, fifth column, and first row, seventh column as first basic pixels IN1_1, IN1_3, IN1_5, and IN1_7, respectively. The input pixels in the first row, second column, first row, fourth column, and first row, sixth column correspond to the second basic pixels IN1_2, IN1_4, and IN1_6, respectively. Further, as illustrated in FIG. 15, the CPU 501 associates the R sub display pixel in the display pixel (for example, P1_3) with the R sub basic pixel in the first basic pixel IN1_5 and the R sub basic pixel in the second basic pixel IN1_4. That is, the CPU 501 associates the R sub-display pixel in the display pixel P1_3 with the input pixel in the first row and fifth column and the first row and fourth column. Further, the CPU 501 associates the first G sub-display pixel in the display pixel P1_3 with the G sub-basic pixel in the first basic pixel IN1_5. That is, the CPU 501 associates the first G sub-display pixel in the display pixel P1_3 with the input pixel in the first row and the fifth column. Furthermore, the CPU 501 associates the B sub display pixel in the display pixel P1_3 with the B sub basic pixel in the first basic pixel IN1_5 and the B sub basic pixel in the second basic pixel IN1_6. That is, the CPU 501 associates the B sub display pixel in the display pixel P1_3 with the input pixel in the first row and the fifth column and the first row and the sixth column. Furthermore, the CPU 501 associates the second G sub-display pixel in the display pixel P1_3 with the G sub-basic pixel in the second basic pixel IN1_6. That is, the CPU 501 associates the second G sub-display pixel in the display pixel P1_3 with the input pixel in the first row and the sixth column.

Next, the CPU 501 determines the luminance value of each sub display pixel from the luminance value of the input pixel associated with the sub display pixel and the first or second basic pixel corresponding to the associated input pixel. It is obtained as a weighted average value based on the weight coefficient set for the sub basic pixel of the same primary color as the primary color of the sub display pixel (A5). More specifically, as shown in FIG. 15, the CPU 501 determines the luminance value of the R sub display pixel in the display pixel (for example, P1_3) for the input pixel in the first row, fifth column, and first row, fourth column. The luminance value, the weight coefficient (0.5) set for the R sub-basic pixel in the first basic pixel IN1_5 and the second basic pixel IN1_4 corresponding to the input pixels in the first row and fifth column and the first row and fourth column, respectively. It is obtained as a weighted average value based on the weight coefficient (0.5) set for the R sub-basic pixel. In addition, the CPU 501 sets the luminance value of the first G sub-display pixel in the display pixel P1_3 to the luminance value of the input pixel in the first row and fifth column and the first luminance value corresponding to the input pixel in the first row and fifth column. It is obtained as a weighted average value based on the weighting factor (1) set for the G sub-basic pixel in one basic pixel IN1_5. It should be noted that a value obtained based on one luminance value and one weighting factor is treated as a “weighted average value” for convenience in this specification. Further, the CPU 501 determines the luminance value of the B sub display pixel in the display pixel P1_3, the luminance value of the input pixel in the first row, fifth column, and first row, sixth column, the first row, fifth column, and first row, six. The weighting factor (0.5) set for the B sub-basic pixel in the first basic pixel IN1_5 and the weighting factor (0...) Set for the B sub-basic pixel in the second basic pixel IN1_6 respectively corresponding to the input pixels in the column. As a weighted average value based on 5). Furthermore, the CPU 501 corresponds to the luminance value of the input pixel in the first row and the sixth column and the input pixel in the first row and the sixth column, with respect to the luminance value of the second G sub-display pixel in the display pixel P1_3. It is obtained as a weighted average value based on the weighting factor (1) set for the B sub basic pixel in the second basic pixel IN1_6. Thus, the display pixel P1_3 is obtained. Display data O_DAT of a display image is generated by performing such processing for each display pixel. The display data O_DAT is temporarily stored in the main storage device 503 and then given to the display control unit 20.

FIG. 16 shows a display image displayed on the display unit 10 when the input image (character “A”, 5 × 10 in pixel units, 5 × 30 in subpixel units) shown in FIG. 30 is given in the present embodiment. (Character 'A', 5 × 5 in pixel units, 5 × 20 in subpixel units). The number of horizontal pixels of the input image shown in FIG. 30 is twice the number of horizontal pixels of the display image shown in FIG. When the number of horizontal pixels of the input image is the same as the number of horizontal pixels of the display image, for example, the CPU 501 performs processing such as making the number of horizontal pixels of the input image twice the number of horizontal pixels of the display image. Also good.

FIG. 17 is a diagram showing a correspondence relationship of the pixels in the fourth row in FIG. The numbers given to each sub basic pixel are different from FIG. 15 and indicate the product of the weighting factor set for the sub basic pixel and the luminance value of the input pixel corresponding to the sub basic pixel. Here, the description will be made by paying attention to the display pixel P4_2. The CPU 501 determines the luminance value of the R sub-display pixel in the display pixel P4_2 as the luminance value (1) of the input pixel in the fourth row and third column and the luminance value (0) of the input pixel in the fourth row and second column. The weighting factor (0.5) set for the R sub-basic pixel in the first basic pixel IN4_3 and the R sub-basic in the second basic pixel IN4_2 respectively corresponding to the input pixels in the fourth row and third column and the fourth row and second column It is obtained as a weighted average value based on the weighting factor (0.5) set for the pixel. That is, the luminance value of the R sub display pixel in the display pixel P4_2 is 0.5 (= (1 × 0.5 + 0 × 0.5) / (0.5 + 0.5)). In addition, the CPU 501 assigns the luminance value of the first G sub-display pixel in the display pixel P4_2 to the luminance value (1) of the input pixel in the fourth row and third column and the input pixel in the fourth row and third column. It is obtained as a weighted average value based on the weighting factor (1) set for the G sub basic pixel in the corresponding first basic pixel IN4_3. That is, the luminance value of the first G sub display pixel in the display pixel P4_2 is 1 (= 1 × 1/1). Further, the CPU 501 sets the luminance value of the B sub display pixel in the display pixel P4_2 to the luminance value (1) of the input pixel in the fourth row and third column and the luminance value (1) of the input pixel in the fourth row and fourth column. And the weighting factor (0.5) set for the B sub basic pixel in the first basic pixel IN4_3 and the B sub in the second basic pixel IN4_4 respectively corresponding to the input pixels in the 4th row 3rd column and the 4th row 4th column. It is obtained as a weighted average value based on the weighting factor (0.5) set for the basic pixel. That is, the luminance value of the B sub display pixel in the display pixel P4_2 is 1 (= (1 × 0.5 + 1 × 0.5) / (0.5 + 0.5)). Furthermore, the luminance value of the second G sub-display pixel in the display pixel P4_2 corresponds to the luminance value (1) of the input pixel in the 4th row and 4th column and the input pixel in the 4th row and 4th column. It is obtained as a weighted average value with the weighting factor (1) set for the G sub-basic pixel in the second basic pixel IN4_4. That is, the luminance value of the second G sub display pixel in the display pixel P4_2 is 1 (= 1 × 1/1). By performing such processing for each display pixel and each row, a display image shown in FIG. 16 is obtained.

In the display image shown in FIG. 16, there is no large jaggy as in the display example shown in FIG. Further, in the display image shown in FIG. 16, the edge portion of the image is not colored as in the display examples shown in FIGS. Further, the display image shown in FIG. 16 is symmetric with respect to the input image shown in FIG. 30, unlike the display examples shown in FIGS. 31 and 32.

<3.3 Effects>
According to the present embodiment, similarly to the first embodiment, it is possible to display a binary image having the number of horizontal pixels exceeding the number of horizontal pixel forming portions of the liquid crystal display device while preventing coloring of the edge portion of the image. . Thereby, a binary image with high visibility can be displayed. In addition, since a high-resolution image can be displayed on a low-resolution display device, the number of pixel formation portions of the display device can be reduced as compared with other display devices that display an image with the same resolution, and the transmittance is improved due to an improvement in transmittance. Power consumption can be reduced.

Further, according to the present embodiment, basic pixels and weighting coefficients corresponding to the four primary colors RGBG are used. Accordingly, an image with higher visibility can be displayed on the RGBG four-primary color image display device.

Furthermore, according to the present embodiment, it is possible to prevent the display pixels in the first column from becoming darker than desired luminance. Thereby, a favorable display quality can be maintained.

<4. Third Embodiment>
<4.1 Overall configuration of liquid crystal display device>
This embodiment is based on the third basic study. FIG. 18 is a schematic diagram showing an electrical configuration of a liquid crystal display device 120 according to the third embodiment of the present invention. In addition, about the component same as 1st Embodiment among the components of this embodiment, the same referential mark is attached | subjected and description is abbreviate | omitted. The liquid crystal display device 120 is configured to display a color image based on the four primary colors R, G, B, and Y. That is, in the liquid crystal display device 120, one display pixel is configured by sequentially arranging the R sub display pixel, the G sub display pixel, the B sub display pixel, and the Y sub display pixel.

There are two types of basic pixels in the present embodiment: a first basic pixel shown in FIG. 19A and a second basic pixel shown in FIG. Here, the primary colors of the sub basic pixels constituting the first basic pixel and the second basic pixel are the primary colors of the sub display pixels constituting the display pixel in the present embodiment, that is, among R, G, B, and Y. Is set. That is, from the left side of FIG. 19A, the first basic pixel is an R sub basic pixel as a red sub basic pixel, and a G sub basic pixel as a green (first primary color with high visual sensitivity) sub pixel. And B sub-basic pixels as blue sub-basic pixels are arranged in order. On the other hand, from the left side of FIG. 19B, the second basic pixel is a B sub basic pixel as a blue sub basic pixel and a Y sub basic pixel as a yellow (second primary color with high visual sensitivity) sub pixel. Are arranged in order. The basic pixel data is stored in advance in the auxiliary storage device 504, for example, but may be stored in advance in the main storage device 503, or may be included in the image processing program PG.

The basic pixel data includes a luminance value ratio based on the third basic study. That is, the ratio of the luminance value between the sub basic pixels in the first basic pixel is “luminance value of R sub pixel: luminance value of G sub pixel: luminance value of B sub pixel = 1: 1: 0.5”, second As the ratio between the sub basic pixels in the basic pixel, “the luminance value of the B sub pixel: the luminance value of the Y sub pixel = 0.5: 1” is set in advance. Further, the basic pixel data includes a weighting factor set in advance for each of the sub basic pixels in the first and second basic pixels. This weighting factor is based on the ratio between the primary color and the luminance value for the sub basic pixels constituting each of the first and second basic pixels. Specifically, the weighting coefficient is a number given to each sub basic pixel in FIGS. 19A and 19B. That is, the weighting factors set for the R sub-basic pixel, the G sub-basic pixel, and the B sub-basic pixel in the first basic pixel are 1, 1, 0.5, respectively, and the B sub-basic pixel in the second basic pixel The weighting factors set for the Y and Y sub-basic pixels are 0.5 and 1, respectively. That is, the weighting factor is set so that the sum of the weighting factors set for the sub basic pixels in the basic pixel corresponding to each sub display pixel described later becomes 1.

In the present embodiment, the sub-display pixel (particularly, the R sub-display) in the display pixel in the first column can be set without setting a special weighting factor for each sub-basic pixel in each basic pixel in the first column. The sum of the weighting factors set for the basic pixels corresponding to (pixels) is 1 as in the other columns.

<4.2 Display data generation method>
Also in the present embodiment, similarly to the first embodiment, calculation processing for generating display data is performed based on the flowchart (A1 to A5) shown in FIG. Since steps A1 to A3 in the present embodiment are the same as steps A1 to A3 in the first embodiment, description thereof is omitted.

The CPU 501 sets the input pixel located in one of the input pixels adjacent to each other in the horizontal direction, that is, the odd-numbered columns (1, 3, 5,...) As the first basic pixel, that is, the even-numbered columns (2, 4). , 6,...) Correspond to the second basic pixel (A4). Further, the CPU 501 uses each of the R sub-display pixel, the G sub-display pixel, the B sub-display pixel, and the Y sub-display pixel constituting each display pixel as at least one input pixel based on the first and second basic pixels. Correlate (A4). FIG. 20 is a diagram showing the correspondence between such pixels. Here, IN1_1 to IN1_7 indicate basic pixels in the first row and the first column to the first row and seventh column, respectively, and P1_1 to P1_3 indicate display pixels in the first row and the first column to the first row and third column, respectively. Furthermore, the number given to each sub basic pixel indicates a weighting factor set for the sub basic pixel. In the following, for example, “basic pixel IN1_3” and “first basic pixel IN1_3” may be used interchangeably. Similarly, for example, “basic pixel IN1_4” and “second basic pixel IN1_4” may be used interchangeably.

More specifically, the CPU 501 inputs the input pixels in the first row, first column, first row, third column, first row, fifth column, and first row, seventh column as first basic pixels IN1_1, IN1_3, IN1_5, and IN1_7, respectively. The input pixels in the first row, second column, first row, fourth column, and first row, sixth column correspond to the second basic pixels IN1_2, IN1_4, and IN1_6, respectively. Further, as illustrated in FIG. 20, the CPU 501 associates the R sub display pixel in the display pixel (for example, P1_3) with the R sub basic pixel in the first basic pixel IN1_5. That is, the CPU 501 associates the R sub display pixel in the display pixel P1_3 with the input pixel in the first row and the fifth column. Further, the CPU 501 further associates the G sub display pixel in the display pixel P1_3 with the G sub basic pixel in the first basic pixel IN1_5. That is, the CPU 501 associates the G sub display pixel in the display pixel P1_3 with the input pixel in the first row and the fifth column. Furthermore, the CPU 501 associates the B sub display pixel in the display pixel P1_3 with the B sub basic pixel in the first basic pixel IN1_5 and the B sub basic pixel in the second basic pixel IN1_6. That is, the CPU 501 associates the B sub display pixel in the display pixel P1_3 with the input pixel in the first row and the fifth column and the first row and the sixth column. Furthermore, the Y sub display pixel in the display pixel P1_3 is associated with the Y sub basic pixel in the second basic pixel IN1_6. That is, the CPU 501 associates the Y sub display pixel in the display pixel P1_3 with the input pixel in the first row and the sixth column.

Next, the CPU 501 determines the luminance value of each sub display pixel from the luminance value of the input pixel associated with the sub display pixel and the first or second basic pixel corresponding to the associated input pixel. It is obtained as a weighted average value based on the weight coefficient set for the sub basic pixel of the same primary color as the primary color of the sub display pixel (A5). More specifically, as shown in FIG. 20, the CPU 501 determines the luminance value of the R sub display pixel in the display pixel (for example, P1_3) and the luminance value of the input pixel in the first row and the fifth column associated with each other. It is obtained as a weighted average value based on the weighting factor (1) set for the R sub-basic pixel in the first basic pixel IN1_5 corresponding to the input pixel in the fifth column. In addition, the CPU 501 sets the luminance value of the G sub display pixel in the display pixel P1_3 to the luminance value of the input pixel in the first row and the fifth column and the first basic pixel corresponding to the input pixel in the first row and the fifth column. It is obtained as a weighted average value based on the weighting factor (1) set for the G sub-basic pixel in IN1_5. Further, the CPU 501 determines the luminance value of the B sub display pixel in the display pixel P1_3, the luminance value of the input pixel in the first row, fifth column, and first row, sixth column, the first row, fifth column, and first row, six. The weighting factor (0.5) set for the B sub-basic pixel in the first basic pixel IN1_5 and the weighting factor (0...) Set for the B sub-basic pixel in the second basic pixel IN1_6 respectively corresponding to the input pixels in the column. As a weighted average value based on 5). Further, the CPU 501 sets the luminance value of the Y sub display pixel in the display pixel P1_3 to the luminance value of the input pixel in the first row and the sixth column and the second basic corresponding to the input pixel in the first row and the sixth column. It is obtained as a weighted average value based on the weighting factor (1) set for the Y sub basic pixel in the pixel IN1_6. Thus, the display pixel P1_3 is obtained. Display data O_DAT of a display image is generated by performing such processing for each display pixel. The display data O_DAT is temporarily stored in the main storage device 503 and then given to the display control unit 20.

FIG. 21 shows a display image displayed on the display unit 10 when the input image (character “A”, 5 × 10 in pixel units, 5 × 30 in subpixel units) shown in FIG. 30 is given in this embodiment. (Character 'A', 5 × 5 in pixel units, 5 × 20 in subpixel units). The number of horizontal pixels of the input image shown in FIG. 30 is twice the number of horizontal pixels of the display image shown in FIG. When the number of horizontal pixels of the input image is the same as the number of horizontal pixels of the display image, for example, the CPU 501 performs processing such as making the number of horizontal pixels of the input image twice the number of horizontal pixels of the display image. Also good.

FIG. 22 is a diagram showing a correspondence relationship of the pixels in the fourth row in FIG. The number given to each sub basic pixel is different from FIG. 20 and represents the product of the weighting factor set for the sub basic pixel and the luminance value of the input pixel corresponding to the sub basic pixel. Here, the description will be made by paying attention to the display pixel P4_2. The CPU 501 sets the luminance value of the R sub display pixel in the display pixel P4_2 to the luminance value (1) of the input pixel in the 4th row and 3rd column and the first basic corresponding to the input pixel in the 4th row and 3rd column. It is obtained as a weighted average value based on the weighting factor (1) set for the R sub basic pixel in the pixel IN4_3. That is, the luminance value of the R sub basic pixel in the display pixel P4_2 is 1 (= 1 × 1/1). In addition, the CPU 501 sets the luminance value of the G sub-display pixel in the display pixel P4_2 to the luminance value (1) of the input pixel in the 4th row and 3rd column and the input pixel in the 4th row and 3rd column. It is obtained as a weighted average value based on the weighting factor (1) set for the G sub-basic pixel in one basic pixel IN4_3. That is, the luminance value of the G sub display pixel in the display pixel P4_2 is 1 (= 1 × 1/1). Further, the CPU 501 sets the luminance value of the B sub display pixel in the display pixel P4_2 to the luminance value (1) of the input pixel in the fourth row and third column and the luminance value of the input pixel in the fourth row and fourth column, The weighting factor (0.5) set for the B sub-basic pixel in the first basic pixel IN4_3 and the B sub-basic pixel in the second basic pixel IN4_4 respectively corresponding to the input pixels in the fourth row and third column and the fourth row and fourth column Is obtained as a weighted average value based on the weighting factor (0.5) set in That is, the luminance value of the B sub display pixel in the display pixel P4_2 is 1 (= (1 × 0.5 + 1 × 0.5) / (0.5 + 0.5)). Further, the CPU 501 corresponds the luminance value of the Y sub display pixel in the display pixel P4_2 to the luminance value (1) of the input pixel in the 4th row and 4th column and the input pixel in the 4th row and 4th column. It is obtained as a weighted average value based on the weighting factor (1) set for the Y sub basic pixel in the second basic pixel IN4_4. That is, the luminance value of the Y sub display pixel in the display pixel P4_2 is 1 (= 1 × 1/1). By performing such processing for each display pixel and each row, a display image shown in FIG. 21 is obtained.

In the display image shown in FIG. 21, there is no large jaggy as in the display example shown in FIG. Further, in the display image shown in FIG. 21, the edge portion of the image is not colored as in the display examples shown in FIGS. 28 and 34. Furthermore, unlike the display examples shown in FIGS. 31 and 32, the display image shown in FIG. 21 is symmetric with respect to the input image shown in FIG.

<4.3 Effects>
According to the present embodiment, similarly to the first embodiment, it is possible to display a binary image having the number of horizontal pixels exceeding the number of horizontal pixel forming portions of the liquid crystal display device while preventing coloring of the edge portion of the image. . Thereby, a highly visible binary image can be displayed. In addition, since a high-resolution image can be displayed on a low-resolution display device, the number of pixel formation portions of the display device can be reduced as compared with other display devices that display an image with the same resolution, and further, the transmittance is reduced due to an improvement in transmittance. Power consumption can be reduced.

Further, according to the present embodiment, basic pixels and weighting coefficients corresponding to the four primary colors of RGBY are used. Accordingly, an image with higher visibility can be displayed on the RGBY four-primary color image display device.

Furthermore, according to this embodiment, it is possible to obtain a good display quality without setting a special weighting factor for the basic pixels in the first column.

<5. Fourth Embodiment>
<5.1 Overall configuration of liquid crystal display device>
Since the liquid crystal display device according to the fourth embodiment of the present invention has the same configuration as the liquid crystal display device 100 according to the first embodiment, description of each component will be omitted.

<5.2 Display data generation method>
Normally, gamma correction is performed on the display data I_DAT. Therefore, the generation of the display data O_DAT shown in the above embodiments is performed by converting the luminance value of each input pixel constituting the input image indicated by the display data I_DAT so as to have a linear relationship with the luminance in the display unit 10. It is better to do from. Therefore, in this embodiment, the display data I_DAT is converted into a linear value that is a value having the above linear relationship, and after obtaining a display image composed of sub-display pixels having a linear luminance value, gamma correction is performed. A desired display image is obtained.

FIG. 23 is a flowchart (B1 to B10) showing calculation processing for generating a display image in the present embodiment. Hereinafter, a display image generation method will be described based on this flowchart. Note that the configuration of the first basic pixel, the configuration of the second basic pixel, and the setting of the weighting coefficient in the present embodiment are the same as those in the first embodiment.

First, the CPU 501 obtains input linear values L0 (x), L1 (from the display data I_DAT (D0 (x), D1 (x) and D2 (x)) based on the following formulas (1) to (3). x) and L2 (x) are obtained (B1).
L0 (x) = D0 (x) ^ γ (1)
L1 (x) = D1 (x) ^ γ (2)
L2 (x) = D2 (x) ^ γ (3)
Here, x is an integer of 1 or more, and D0 (x), D1 (x), and D2 (x) are the luminance value of the R component, the luminance value of the G component, and the luminance of the B component, respectively. Value, for example, γ = 2.2. By this step B1, the input linear values L0 (x), L1 (x), and L2 (x) in which the display data DAT (input pixels D0 (x), D1 (x), and D2 (x)) are linear values are obtained. Is converted to

Next, the CPU 501 sets the value of the counter i to 0 (B2). The value of the counter i in steps B2 to B5 corresponds to “input pixel column number−1”.

Next, the CPU 501 outputs linear values E0 (i), E1 (i), and E2 (i) corresponding to the luminance values before the gamma correction of the R sub-display pixel, the B sub-display pixel, and the G sub-display pixel, respectively. Is initialized to 0 (B3).

Next, the CPU 501 increments the counter i (B4).

Next, the CPU 501 determines whether or not the counter i has reached the number of horizontal pixels of the input pixel (B5). If the counter i has not reached the number of horizontal pixels of the input pixel, the process returns to step B3. On the other hand, when the counter i reaches the number of horizontal pixels of the input pixel, the process proceeds to step B6. That is, all output linear values E0 (i), E1 (i), and E2 (i) are initialized to 0 by repeating steps B3 to B5.

Next, the CPU 501 sets the value of the counter i to 0 (B6). The value of the counter i in steps B6 to B9 corresponds to “display pixel column number−1”.

Next, the CPU 501 adds the product of the input linear value and the weighting coefficient to each output linear value (B7). That is, the CPU 501 first adds the product of the input linear value and the weighting coefficient to each output linear value based on the following equations (3) to (5).
E0 (i) = E0 (i) + L0 (i × 2) × weighting coefficient 00 (3)
E1 (i) = E1 (i) + L1 (i × 2) × weighting coefficient 01 (4)
E2 (i) = E2 (i) + L2 (i × 2) × weighting coefficient 02 (5)
Here, the weighting factor 00, the weighting factor 01, and the weighting factor 02 are the weighting factors set for the R sub-basic pixel, G sub-basic pixel, and B sub-basic pixel of the first basic pixel in the first embodiment. Which is 0.5. Thereafter, the CPU 501 adds the product of the input linear value and the weighting coefficient to each output linear value based on the following equations (6) to (9).
E1 (i) = E1 (i) + L1 (i × 2 + 1) × weighting factor 11 (6)
E2 (i) = E2 (i) + L2 (i × 2 + 1) × weighting factor 12 (7)
E0 (i + 1) = E0 (i + 1) + L0 (i × 2 + 1) × weighting factor 10 (8)
E1 (i + 1) = E1 (i + 1) + L1 (i × 2 + 1) × weighting factor 13 (9)
Here, the weighting factor 11, the weighting factor 12, the weighting factor 10, and the weighting factor 13, the left end G sub basic pixel, the B sub basic pixel, the R sub basic pixel, and the right end of the second basic pixel in the first embodiment. 0.25, 0.5, 0.5, and 0.25, which are weighting factors set for the G sub-basic pixels, respectively.

Here, the above formulas (3) to (7) will be described with reference to FIG. Here, for convenience of explanation, the input linear value is described as the luminance value of the input pixel, and the output linear value is described as the luminance value of the display pixel. For example, when i = 1, in Expression (3), Expression (4), and Expression (5), the luminance value of the R sub display pixel, the luminance value of the G sub display pixel, and the B sub display pixel in the display pixel P1_2 Is added to the luminance value. When attention is paid to the luminance value relating to G, in Equation (4), E1 (2) on the right side is already added in Equation (9) when i = 0, and the luminance value (0.25) of the G sub-pixel in IN1_2. ). By adding the product of L1 (2) (1), which is the luminance value of the input pixel in the first row and third column, to the weighting coefficient 01 (0.5), E1 (1) is 0.75 ( = 0.25 + 1 × 0.5). The same applies to E0 (1) and E2 (1). That is, a process of adding the luminance value of each sub basic pixel in the first basic pixel to the luminance value of the corresponding sub display pixel is performed by Expressions (3) to (5).

Further, when i = 1, in Expression (6) and Expression (7), addition to the luminance value of the G sub display pixel and the luminance value of the B sub display pixel in the display pixel P1_2 is performed. For example, in Expression (6), E1 (1) on the right side is E1 (1) (0.75) obtained in Expression (4) above. By adding the product of L1 (3) (1), which is the luminance value of the input pixel in the first row and fourth column, to the weighting factor 11 (0.25), E1 (1) is 1 (= 0 .75 + 1 × 0.25). The same applies to E2 (1). Further, when i = 1, in Expression (8) and Expression (9), addition to the luminance value of the R sub display pixel and the luminance value of the G sub display pixel in the display pixel P1_3 is performed. For example, in Expression (9), E1 (2) on the right side is 0. By adding the product of L1 (3) (1), which is the luminance value of the input pixel in the first row and fourth column, to the weighting factor 10 (0.25), E1 (2) is 0.25 ( = 0 + 1 x 0.25). The same applies to E0 (2). That is, a process of adding the luminance value of each sub-basic pixel in the second basic pixel to the luminance value of the corresponding sub-display pixel is performed by Expressions (6) to (9).

Next, the CPU 501 increments the counter i (B8).

Next, the CPU 501 determines whether or not the counter i has reached the number of horizontal pixels of the display pixel (B5). If the counter i has not reached the number of horizontal pixels of the display pixel, the process returns to step B7. On the other hand, when the counter i reaches the number of horizontal pixels of the display pixel, the process proceeds to step B9. That is, all output linear values E0 (i), E1 (i), and E2 (i) are obtained by repeating steps B7 to B9. These output linear values E0 (i), E1 (i), and E2 (i) result in the input pixels associated with the output linear values E0 (i), E1 (i), and E2 (i). Obtained as a weighted average value based on the luminance value and the weighting factor set for the sub-basic pixel of the same primary color as the primary color of the sub-display pixel among the first or second basic pixels corresponding to the associated input pixel It is done.

Next, the CPU 501 calculates display data O_DAT (F0 (i), F1) from the output linear values E0 (i), E1 (i), and E2 (i) based on the following formulas (10) to (12). (I) and F2 (i)) are obtained (B10).
F0 (i) = E0 (i) ^ (1 / γ) (10)
F1 (i) = E1 (i) ^ (1 / γ) (11)
F2 (i) = E2 (i) ^ (1 / γ) (12)
Here, F0 (i), F1 (i), and F2 (i) are the luminance value of the R sub display pixel, the luminance value of the G sub display pixel, and the luminance value of the B sub display pixel, respectively. Further, γ is the same as that in the formulas (1) to (3), for example, γ = 2.2. By this step B10, display data O_DAT (F0 (i) in which output linear values E0 (i), E1 (i), and E2 (i), which are linear values, are gamma-corrected according to the gamma characteristics of the liquid crystal display device. ), F1 (i), and F2 (i)). Steps B2 to B9 shown above correspond to steps A4 and A5 in the first embodiment.

FIG. 24 shows a display image displayed on the display unit 10 when the input image (character “A”, 5 × 10 in pixel units, 5 × 30 in subpixel units) shown in FIG. 30 is given in this embodiment. (Character 'A', 5 × 5 in pixel units, 5 × 15 in subpixel units). The number of horizontal pixels of the input image shown in FIG. 30 is twice the number of horizontal pixels of the display image shown in FIG. The display image shown in FIG. 24 differs from the display image of the first embodiment shown in FIG. 9 in the luminance values of the sub display pixels. That is, the portions of 0.25, 0.5, and 0.75 in FIG. 9 are 0.53, 0.73, and 0.88, respectively.

<5.3 Effects>
According to the present embodiment, similarly to the first embodiment, it is possible to display a binary image having the number of horizontal pixels exceeding the number of horizontal pixel forming portions of the liquid crystal display device while preventing coloring of the edge portion of the image. . Thereby, a binary image with high visibility can be displayed. In addition, since a high-resolution image can be displayed on a low-resolution display device, the number of pixel formation portions of the display device can be reduced as compared with other display devices that display an image with the same resolution, and further, the transmittance is reduced due to an improvement in transmittance. Power consumption can be reduced.

Further, according to the present embodiment, as in the first embodiment, basic pixels and weighting factors corresponding to the three primary colors of RGB are used. Thereby, an image with higher visibility can be displayed in the RGB three primary color image display device.

Furthermore, according to this embodiment, display data is generated in consideration of gamma characteristics. Thereby, it is possible to display an image with higher visibility and good display quality.

<5.4 Modification>
In the liquid crystal display device according to the modification of the fourth embodiment, each process executed by the CPU 501 in the fourth embodiment is realized by a circuit. FIG. 25 is a block diagram showing a configuration of the image processing device 52 in the present modification. Among the components of this modification, the same elements as those in the first embodiment or the first modification are denoted by the same reference numerals and description thereof is omitted. The image processing apparatus 52 according to this modification is obtained by adding components to the image processing apparatus 51 according to the first modification of the first embodiment. The image processing device 52 further includes a linear conversion circuit 515 and a gamma conversion circuit 522. The weighting circuit 511 includes a counter 512 and a weight selection circuit 513. Furthermore, the array circuit 517 includes two flip-flops (hereinafter referred to as “FF”) 518 and 519. In the following, description of operations common to the first modification of the first embodiment is omitted.

The linear conversion circuit 515 corresponds to the above step B1, receives display data I_DAT given from the outside, and converts it into an input linear value. The counter 512 counts the number of horizontal pixels of the input pixel to obtain a count i. The weight selection circuit 513 selects the weight coefficient in step B7. The multiplication circuit 514 obtains the product of the input linear value and the weighting coefficient in step B7.

The FF 518 holds the product of the input linear value and the weighting coefficient given from the multiplication circuit 514, and the FF 519 holds the product of the input linear value and the weighting coefficient from the FF 518. For example, paying attention to the luminance value relating to G, when L1 (2) × weighting coefficient 01, L1 (3) × weighting coefficient 11 and L1 (3) × weighting coefficient 13 are given from the FF 519 to the adding circuit 521, simultaneously , L1 (4) × weighting coefficient 01, L1 (5) × weighting coefficient 11, and L1 (5) × weighting coefficient 13 from the FF 518 to the adding circuit 521, and L1 (6) × weighting from the multiplying circuit 514 to the adding circuit 521. 01, L1 (7) × weighting factor 11 and L1 (7) × weighting factor 13 are given. The adder circuit 521 obtains an output linear value by adding the product of the given input linear value and the weighting factor. For example, the output linear value E (2) is obtained by the following equation (13).
E (2) = L1 (4) × weighting coefficient 13 + L1 (5) × weighting coefficient 01 + L1 (6) × weighting coefficient 11 (13)

As described above, the counter 512, the weight selection circuit 513, the multiplication circuit 514, the FF 518, the FF 519, and the addition circuit 521 perform operations corresponding to the above steps B2 to B9.

The gamma conversion circuit 522 converts E0 (i), E1 (i), and E2 (i) into display data O_DAT (F0 (i), F1 (i), and F2 (i)). That is, the gamma conversion circuit 522 performs an operation corresponding to step B10.

According to this modification, the same effect as that of the fourth embodiment can be obtained by configuring the image processing device with a circuit.

<6. Other>
In each embodiment, basic pixel data corresponding to the number or primary colors of the sub-pixel forming portions constituting the pixel forming portion in the liquid crystal display device may be read from the auxiliary storage device 504 to the main storage device 503.

Although the sub-pixel forming portions constituting the pixel forming portion in the first embodiment are arranged in the order of R, G, and B, they may be arranged in the order of B, G, and R. In this case, the first basic pixel has a configuration obtained by inverting the first basic pixel shown in FIG. 6A (in order from the left, the B sub basic pixel, the G sub basic pixel, and the R sub basic pixel). Further, the second basic pixel has a configuration in which the B sub basic pixel and the R sub basic pixel in the second basic pixel shown in FIG. 6B are inverted (in order from the left, the left end G sub basic pixel and the R sub basic pixel). Basic pixel, B sub basic pixel, right end G sub basic pixel). The same applies to other embodiments.

The ratio of the luminance values between the sub-basic pixels in the first basic pixel and the second basic pixel may be set so that the obtained display pixel is achromatic, and other ratios may be used.

The present invention is not limited to the case where one pixel forming unit is configured by a predetermined number of subpixel forming units arranged in the horizontal direction, and one pixel forming unit is configured by a predetermined number of subpixel forming units arranged in the vertical direction. It can also be applied when configured. In this case, for example, the input pixels located in the odd-numbered rows (1, 3, 5,...) And the input pixels located in the even-numbered rows (2, 4, 6,. What is necessary is just to make it respond | correspond to a basic pixel and a 2nd basic pixel.

The present invention can be applied not only to a liquid crystal display device but also to an organic EL display device, for example. In addition, various modifications can be made without departing from the spirit of the present invention.

As described above, according to the present invention, it is possible to obtain a display method, a display device, a display program, and a recording medium on which the display method can display an image with high visibility.

The present invention can be applied to an image processing device for generating display data corresponding to an image to be displayed on a display unit of a display device.

DESCRIPTION OF SYMBOLS 10 ...

Display part

12R, 12G, 12B ... Sub-pixel formation part 20, 21, 22 ...

Display control part

50, 51, 52 ...

Image processing apparatus

100, 110, 120 ... Liquid crystal display device 501 ... CPU
502 ... Input interface 511 ... Weighting circuit 512 ... Counter 513 ... Weight selection circuit 514 ... Multiplication circuit 515 ... Linear conversion circuit 517 ...

Array circuit

518, 519 ... FF
521: Addition circuit 522: Gamma conversion circuits IN1_1 to IN1_7, IN4_1 to IN4_10 ... Basic pixels I_DAT, O_DAT ... Display data Pi_j ... Pixel formation portion (display pixel)
TI: Input terminal

Claims

A plurality of pixel forming portions for forming a plurality of display pixels constituting a display image based on a predetermined number of primary colors, and each pixel forming portion is configured by a predetermined number of sub-pixel forming portions corresponding to the predetermined number of primary colors An image processing apparatus for generating display data for displaying the display image on a display unit,
An input unit that acquires an input image in which the resolution in the direction in which the predetermined number of sub-pixel forming units are arranged in each pixel forming unit is higher than the display image;
Of the plurality of input pixels constituting the input image, one of the input pixels adjacent to each other in the direction in which the predetermined number of sub-basic pixels are arranged in each pixel forming unit is a first basic pixel including a predetermined number of sub-basic pixels, The other is made to correspond to a second basic pixel composed of a predetermined number of sub-basic pixels, and each of the predetermined number of sub-display pixels constituting each display pixel is set as at least one input pixel based on the first and second basic pixels. Associating the luminance value of each sub display pixel with the luminance value of the associated input pixel and the sub display of the sub basic pixels in the first or second basic pixel corresponding to the associated input pixel A calculation unit for obtaining a weighted average value based on a weighting factor set in advance for a sub basic pixel of the same primary color as the primary color of the pixel,
The primary color of each of the sub basic pixels constituting each of the first and second basic pixels and the ratio of the luminance value between the sub basic pixels are preset, and the correspondence to the input pixel of each sub display pixel The setting of the weighting factor for each sub-basic pixel in the first and second basic pixels means that the primary color and the luminance value of the sub-basic pixel constituting each of the first and second basic pixels are An image processing apparatus based on the setting of the ratio.
The first basic pixel includes three sub basic pixels,
The second basic pixel includes four sub basic pixels,
A primary color with high visual sensitivity is set as the primary color of the sub basic pixel located in the center among the three sub basic pixels in the first basic pixel,
2. The image processing device according to claim 1, wherein a primary color having high visual sensitivity is set as a primary color of a sub basic pixel located at both ends of the four sub basic pixels in the second basic pixel. .
3. The image processing apparatus according to claim 2, wherein the primary color having high visual sensitivity is green.
Each display pixel is configured by sequentially arranging a red sub-display pixel, a green sub-display pixel, and a blue sub-display pixel,
The first basic pixel is configured by sequentially arranging a red sub-basic pixel, a green sub-basic pixel, and a blue sub-basic pixel,
The second basic pixel is configured by sequentially arranging a first green sub-basic pixel, a blue sub-basic pixel, a red sub-basic pixel, and a second green sub-basic pixel,
The weighting factor set for the red sub-basic pixel, the green sub-basic pixel, and the blue sub-basic pixel in the first basic pixel is 0.5,
The weighting factor set for the second green sub-basic pixel, the second blue sub-basic pixel, the second red sub-basic pixel, and the third green sub-basic pixel Are 0.25, 0.5, 0.5, and 0.25, respectively.
The computing unit is
The luminance value of the red sub-display pixel is set to the luminance value of the two input pixels associated with each other, and the red sub-basic pixel in the first basic pixel corresponding to one of the two input pixels associated with each other. As a weighted average value based on the weighting factor set for and the weighting factor set for the red sub-basic pixel in the second basic pixel corresponding to the other,
The luminance value of the green sub-display pixel is set to the luminance value of the three input pixels associated with each other and the first basic pixel corresponding to the first input pixel among the three input pixels associated with each other. The weighting factor set for the green sub-basic pixel, the weighting factor set for the first green sub-basic pixel in the second basic pixel corresponding to the second input pixel, and a third input A weighted average value based on the weighting factor set for the second green sub-basic pixel corresponding to the pixel,
The luminance value of the blue sub-display pixel is set to the luminance value of the two input pixels associated with each other, and the blue sub-basic pixel in the first basic pixel corresponding to one of the two input pixels associated with each other. The weighted average value is calculated based on the weighting factor set for the second basic pixel and the weighting factor set for the blue sub-basic pixel corresponding to the other. The image processing apparatus according to 3.
The red sub-basic pixel, the green sub-basic pixel in the first basic pixel associated with the input pixel located at the extreme end in the direction in which the predetermined number of sub-pixel forming portions are arranged in each pixel forming portion; The image processing apparatus according to claim 4, wherein the weighting factors set for the blue sub-basic pixels are 1, 0.75, and 0.5, respectively.
The first basic pixel and the second basic pixel are composed of three sub basic pixels,
The primary color having high visual sensitivity is set as a primary color of a sub-basic pixel located in the center among three sub-basic pixels in the first basic pixel and the second basic pixel. The image processing apparatus described.
The image processing apparatus according to claim 6, wherein the primary color having high visual sensitivity is green.
Each display pixel is configured by sequentially arranging a red sub-display pixel, a first green sub-display pixel, a blue sub-display pixel, and a second green sub-display pixel,
The first basic pixel is configured by sequentially arranging a red sub-basic pixel, a green sub-basic pixel, and a blue sub-basic pixel,
The second basic pixel is configured by sequentially arranging a blue sub-basic pixel, a green sub-basic pixel, and a red sub-basic pixel.
The weighting factors set for the red sub-basic pixel, the green sub-basic pixel, and the blue sub-basic pixel in the first basic pixel are 0.5, 1, and 0.5, respectively.
The weighting factors set for the blue sub-basic pixel, the green sub-basic pixel, and the red sub-basic pixel in the second basic pixel are 0.5, 1, and 0.5, respectively.
The computing unit is
The luminance value of the red sub-display pixel is set to the luminance value of the two input pixels associated with each other, and the red sub-basic pixel in the first basic pixel corresponding to one of the two input pixels associated with each other. As a weighted average value based on the weighting factor set for and the weighting factor set for the red sub-basic pixel in the second basic pixel corresponding to the other,
The luminance value of the first green sub-display pixel is set to the luminance value of the associated input pixel and the green sub-basic pixel in the first basic pixel corresponding to the associated input pixel. Obtained as a weighted average value based on the set weighting factor,
The luminance value of the blue sub-display pixel is set to the luminance value of the two input pixels associated with each other, and the blue sub-basic pixel in the first basic pixel corresponding to one of the two input pixels associated with each other. As a weighted average value based on the weighting factor set for and the weighting factor set for the blue sub-basic pixel in the second basic pixel corresponding to the other,
The luminance value of the second green sub-display pixel is set to the luminance value of the associated input pixel and the green sub-basic pixel in the second basic pixel corresponding to the associated input pixel. The image processing apparatus according to claim 7, wherein the image processing apparatus obtains a weighted average value based on the set weight coefficient.
The first basic pixel includes three sub basic pixels,
The second basic pixel includes two sub basic pixels,
A first primary color having high visual sensitivity is set as the primary color of the sub basic pixel located in the center among the three sub basic pixels in the first basic pixel,
The image processing apparatus according to claim 1, wherein a second primary color having high visual sensitivity is set as one primary color of the two sub basic pixels in the second basic pixel.
The first primary color with high visual sensitivity is green;
The image processing apparatus according to claim 9, wherein the second primary color having high visual sensitivity is yellow.
Each display pixel is configured by sequentially arranging a red sub-display pixel, a green sub-display pixel, a blue sub-display pixel, and a yellow sub-display pixel.
The first basic pixel is configured by sequentially arranging a red sub-basic pixel, a green sub-basic pixel, and a blue sub-basic pixel,
The second basic pixel is configured by sequentially arranging a blue sub basic pixel and a yellow sub basic pixel,
The weighting factors set for the red sub-basic pixel, the green sub-basic pixel, and the blue sub-basic pixel in the first basic pixel are 1, 1, and 0.5, respectively.
The weighting factors set for the blue sub-basic pixel and the yellow sub-basic pixel in the second basic pixel are 0.5 and 1, respectively.
The computing unit is
The luminance value of the red sub-display pixel is set with respect to the luminance value of the associated input pixel and the red sub-basic pixel in the first basic pixel corresponding to the associated input pixel. Obtained as a weighted average value based on the weighting factor,
The luminance value of the green sub-display pixel is set for the luminance value of the associated input pixel and the green sub-basic pixel in the first basic pixel corresponding to the associated input pixel. Obtained as a weighted average value based on the weighting factor,
The luminance value of the blue sub-display pixel is set to the luminance value of the two input pixels associated with each other, and the blue sub-basic pixel in the first basic pixel corresponding to one of the two input pixels associated with each other. As a weighted average value based on the weighting factor set for and the weighting factor set for the blue sub-basic pixel in the second basic pixel corresponding to the other,
The luminance value of the yellow sub-display pixel is set for the luminance value of the associated input pixel and the yellow sub-basic pixel in the second basic pixel corresponding to the associated input pixel. The image processing apparatus according to claim 10, wherein the image processing apparatus calculates the weighted average value based on the weighting coefficient.
The computing unit is
The luminance value of each sub display pixel is the primary color of the sub display pixel among the luminance value of the associated input pixel and the sub basic pixel in the first or second basic pixel corresponding to the associated input pixel. Before obtaining a weighted average value based on a weighting factor set in advance for the sub-basic pixels of the same primary color, and converting the luminance value of each input pixel to have a linear relationship with the luminance in the display unit,
For the sub-basic pixel of the same primary color as the primary color of the sub-display pixel among the sub-basic pixels in the first or second basic pixel corresponding to the correlated input pixel and the luminance value of the associated input pixel The luminance value of each sub display pixel obtained as a weighted average value based on a preset weighting factor is converted into a value corresponding to the gamma characteristic of the display unit. Image processing device.
A display device comprising the image processing device according to any one of claims 1 to 12.
A plurality of pixel forming portions for forming a plurality of display pixels constituting a display image based on a predetermined number of primary colors, and each pixel forming portion is configured by a predetermined number of sub-pixel forming portions corresponding to the predetermined number of primary colors An image processing method for generating display data for displaying the display image on a display unit,
Obtaining an input image in which the resolution in the direction in which the predetermined number of sub-pixel forming units are arranged in each pixel forming unit is higher than the display image;
Of the plurality of input pixels constituting the input image, one of the input pixels adjacent to each other in the direction in which the predetermined number of sub-basic pixels are arranged in each pixel forming unit is a first basic pixel including a predetermined number of sub-basic pixels, The other is made to correspond to a second basic pixel composed of a predetermined number of sub-basic pixels, and each of the predetermined number of sub-display pixels constituting each display pixel is set as at least one input pixel based on the first and second basic pixels. Associating the luminance value of each sub display pixel with the luminance value of the associated input pixel and the sub display of the sub basic pixels in the first or second basic pixel corresponding to the associated input pixel Obtaining a weighted average value based on a weighting factor set in advance for a sub-basic pixel of the same primary color as the primary color of the pixel,
The primary color of each of the sub basic pixels constituting each of the first and second basic pixels and the ratio of the luminance value between the sub basic pixels are preset, and the correspondence to the input pixel of each sub display pixel The setting of the weighting factor for each sub-basic pixel in the first and second basic pixels means that the primary color and the luminance value of the sub-basic pixel constituting each of the first and second basic pixels are An image processing method based on the setting of the ratio.
The first basic pixel includes three sub basic pixels,
The second basic pixel includes four sub basic pixels,
A primary color with high visual sensitivity is set as the primary color of the sub basic pixel located in the center among the three sub basic pixels in the first basic pixel,
The image processing method according to claim 14, wherein a primary color having high visual sensitivity is set as a primary color of a sub basic pixel located at both ends of the four sub basic pixels in the second basic pixel. .
The first basic pixel and the second basic pixel are composed of three sub basic pixels,
The primary color having high visual sensitivity is set as a primary color of a sub basic pixel located in the center among three sub basic pixels in the first basic pixel and the second basic pixel. The image processing method as described.
The first basic pixel includes three sub basic pixels,
The second basic pixel includes two sub basic pixels,
A first primary color having high visual sensitivity is set as the primary color of the sub basic pixel located in the center among the three sub basic pixels in the first basic pixel,
The image processing method according to claim 14, wherein a second primary color having high visual sensitivity is set as one primary color of the two sub basic pixels in the second basic pixel.
The luminance value of each sub display pixel is the primary color of the sub display pixel among the luminance value of the associated input pixel and the sub basic pixel in the first or second basic pixel corresponding to the associated input pixel. Converting the luminance value of each input pixel to have a linear relationship with the luminance in the display unit before obtaining a weighted average value based on a weighting factor set in advance for sub-basic pixels of the same primary color as
For the sub-basic pixel of the same primary color as the primary color of the sub-display pixel among the sub-basic pixels in the first or second basic pixel corresponding to the correlated input pixel and the luminance value of the associated input pixel The method further comprises the step of converting the luminance value of each sub-display pixel obtained as a weighted average value based on a preset weighting factor into a value corresponding to the gamma characteristic of the display unit. Item 15. The image processing method according to Item 14.
An image processing program that causes a computer to execute each step in the image processing method according to any one of claims 14 to 18.
A computer-readable recording medium on which the image processing program according to claim 19 is recorded.