JPH08242427A - Display data converter - Google Patents

Abstract

PURPOSE: To reduce uneven coloring in the horizontal direction by minimizing a memory capacity of a memory of a display data converter. CONSTITUTION: Display data comprising one-set of R data 101, G data 102 and B data 103 are converted into a luminance signal 104 and color difference signals 107, 108, a vertical direction filter means provides correlation to a luminance between lines of only the luminance signal 104 and only the luminance signal is stored in a display data converter 100 as display data. Thus, the increase in the capacity of the memory is suppressed. Furthermore, a horizontal direction filter means 6 provides correlation to the color difference signals 107, 108 in the horizontal direction to reduce the uneven coloring in the horizontal direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display data conversion device for converting display data for a progressive scanning system.

[0002]

2. Description of the Related Art In recent image display technology, image data displayed on a personal computer screen can be displayed on a television receiver as an image. However, there are the following differences between the scanning method of the personal computer and the scanning method of the television.

The difference between the scanning system of the personal computer and the scanning system of the television will be briefly described with reference to FIG. FIG. 4A is a diagram showing a scanning system of a television, and FIG. 4B is a diagram showing a scanning system of a personal computer.

When displaying an image on a personal computer, as shown in FIG. 4B, the image data is scanned from the upper line to the lower line, and the image data is sequentially scanned from left to right. The progressive scanning method is adopted to display the image. On the other hand, in the television system, FIG.
An interlaced scanning method is used in which scanning is interlaced for each line as shown in FIG. In the interlaced scanning method, if there are 525 scanning lines, first, the scanning lines of the first field (first line, third line, fifth line,
(525th line), that is, an image is displayed on the odd-numbered scanning lines, and then the scanning lines of the second field (2nd line, 4th line, 6th line, ..., 524th line),
That is, it is a scanning method in which an image is displayed on even-numbered scanning lines.

As described above, when displaying an image on the television receiver, the data is displayed only every other line. However, since image data for television is generally a natural image, there is almost no significant difference in brightness between adjacent lines. Therefore, even if the thinning-out display (displaying every other line) is performed in the vertical direction, the human eyes hardly feel the flicker. If there is no extreme difference between the brightness of the data displayed on one line and the brightness of the data displayed on the next line, the same line will appear to the human eye to appear to be shining and no flicker will be felt. Because there is no.

However, in the case of image data for a personal computer, since it is an artificially created image, most of it is a still image, and there are often extreme differences in brightness between adjacent lines. When display data for a progressive scanning personal computer is displayed on a television receiver, the image data for the personal computer can be thinned out at a ratio of one line per two lines to obtain a television image. However, when the display data for a personal computer is displayed on a television receiver by such a method, the human eyes perceive flicker.

Therefore, in order to prevent the brightness of adjacent data in the vertical direction from becoming steep, a method has been adopted in which display data for a personal computer is converted in advance by a display data conversion device and then used as data for a television image.

In the display data conversion device, a plurality of lines of data for a personal computer are filtered to create one line of display data, and the data adjacent to each other in the vertical direction are correlated with each other before being used for a television image. It was used as data.

The filtering process for correlating adjacent data means, for example, using one line of data for three lines of personal computer data. By performing such filter processing, the second line of the display data used for the television image is
A signal obtained by filtering the display data of 1, 2, and 3 lines for a personal computer is used, and the third line of the display data used for a television image is the display data of 2, 3, and 4 lines for a personal computer. Will be used. In this way, filter the display data of multiple lines,
By using the correlation between adjacent display data in the vertical direction and then displaying the television image, the brightness of the adjacent display data in the vertical direction does not become steep, and the display data for the personal computer is displayed on the television. Even if the image was displayed on the receiver, the human eyes could not feel the flicker.

A conventional display data conversion device will be described below with reference to FIG. FIG. 3 is a diagram showing a configuration of a conventional display data conversion device.

As shown in FIG. 3, 1 is a display control means,
1 for R data (red data) 121, G data (green data) 122, and B data (blue data) 123
It can be sequentially output as a set of display data. Two
Reference numerals 2, 25, and 28 are 1-line delay units, which can delay the R data 121, the G data 122, and the B data 123 by one line, respectively. 23, 2
Reference numerals 6 and 29 are also one-line delay means, and delays R for one line output from the one-line delay means 22, 25, and 28, respectively.
The data 124, the 1-line delay G data 126, and the 1-line delay B data 128 can be further delayed by 1 line. 24 is a vertical filter means,
The R data 121, the delayed R data 124 for one line, and the delayed R data 125 for two lines are filtered to form one R
Data can be output. Reference numeral 27 is a vertical direction filter means, which is G data 122 and delay G data 1 for one line
It is possible to filter the delayed G data 127 for 26 and 2 lines and output one G data. Reference numeral 30 denotes a vertical direction filter means, which can filter the B data 123, the delayed B data 128 for one line, and the delayed B data 129 for two lines to output one B data. Reference numeral 31 is a conversion means, which is vertical filter means 24, 2.
Filtered R output from each of 7 and 30
Data 130, G data 131, and B data 132
Luminance signal (Y) 133, color difference signal (Cr) 134,
The color difference signal (Cb) 135 can be converted. 14
Is a selecting means which can select and output either one of the color difference signal (Cr) 134 and the color difference signal (Cb) 135. Reference numeral 7 denotes a display means, which is a luminance signal (Y) 133.
And the color difference signal 136 output from the selecting means 14 (the color difference signal 136 is either one of the color difference signal (Cr) 134 and the color difference signal (Cb) 135) in the television receiver. Images can be displayed.

The operation of the conventional display data conversion apparatus configured as above will be described. Since the R data 121, the G data 122, and the B data 123 output from the display control means 1 are simultaneously processed in the same manner,
The description of the G data 122 and the B data 123 is omitted, and only the R data 121 is described.

The R data 121 is sequentially output from the display control means 1. Now, it is assumed that the R data of the third line is output from the display control means 1. At this time, the 1-line delay means 22 outputs the R-data of the second line output from the display control means 1 before the R-data of the third line is output. From the 1-line delay means 23,
Display control means 1 before the R data of the second line is output
The R data of the first line output from is output. Then, based on the data of three lines, the vertical direction filter means 24 performs a filtering process to obtain one R data 130.
make.

The same operation is repeated, and when the filtering process for all the data for one line is completed, the vertical filter means 24 then outputs the second and third lines.
One R data 130 obtained by filtering the data of the third line of the fourth line is output.

The G data 131, the B data 132, and the R data 130, which have been filtered by the same method, are converted into a luminance signal (Y) 133 and a color difference signal (Cr) 13 by the conversion means 31.
4. Converted to color difference signal (Cb) 135.

Then, either the color difference signal (Cr) 134 or the color difference signal (Cb) 135 and the luminance signal (Y) 133 are input from the display data conversion device 200 to the display means 7, and the television is supplied. Even if the image for the personal computer is displayed on the receiver, the flicker can be prevented.

[0017]

However, in the above-described conventional display data conversion device, it is necessary to always store data for three lines for R data, G data, and B data having luminance information and color difference information. I have to. Therefore, the 1-line delay means 22, 23, 2
Each of 5, 26, 28 and 29 requires a memory means for storing R data, G data or B data including luminance information and color difference information. Since the R data, the G data, and the B data including the luminance information and the color difference information have a large amount of information, there is a problem that a huge capacity of memory is required.

Further, although the above-mentioned conventional display data conversion device prevents flicker due to a change in luminance between lines, it does not correlate adjacent color difference signals in the horizontal direction. When the image is displayed on the John receiver, there is a problem that the color is garbled.

The cause of the garbled color will be briefly described here. Color information given when displaying an image on a television receiver includes color difference signal (Cr) 134 and color difference signal (Cb).
There are two types, 135. In the television scanning method, the color difference signal (C
The color difference signal 136, which is one of the r) 134 and the color difference signal (Cb) 135, is selected by the selection means 14. For example, there is a method of selecting the color difference signal (Cr) 134, the color difference signal (Cb) 135, the color difference signal (Cr) 134, ... In order for each dot.

However, the color difference signal (Cr) 134 does not include the color information of the B data 103, while the color difference signal (Cb) 135 does not include the information of the R data 101. Therefore, Cb, Cr, Cb, Cr,
When the display data are arranged in the order such as ......, but when the order is changed like Cb, Cr, Cr, Cb, ..., it seems that the color unevenness is caused by the continuous Cr.

Since the display data of a natural image (for television image) does not have an extreme difference in color between adjacent dots, there is also no extreme difference in color difference signal. Therefore, even if there is color unevenness due to the color difference signal, it is almost impossible for the human eye to recognize the color unevenness.

However, when the adjacent color difference signals are extremely different as in the case of data for a personal computer, the color unevenness can be recognized by the human eye as the color unevenness. This phenomenon is generally called garbled and has been a cause of degrading image quality.

The present invention solves the above problems, and an object of the present invention is to provide a converter capable of suppressing the memory capacity.

Another object of the present invention is to provide a conversion device capable of eliminating color ghosting.

[0025]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention converts a display data having a set of red data, green data and blue data into a luminance signal and a color difference signal, and a converting means. , N (where m <n, m is 0 or a natural number, and n is a natural number) are delayed by (n−m +
1) A means for simultaneously outputting the luminance signals for the lines and a filter means for outputting one luminance signal from the luminance signals for the (n-m + 1) lines.

In order to solve the above problems, the present invention uses the color difference signals output from the conversion means as p, ..., Q.
(P <q, p represents 0 or a natural number, and q represents a natural number) Delayed by dots, and continuous in the horizontal direction (q-p
+1) dot color difference signals are filtered, and a second filter means for outputting one color difference signal is provided.

[0027]

With the above arrangement, the present invention can convert color data into a luminance signal and a color difference signal and then output one luminance signal from the luminance signals for a plurality of lines only for the luminance signal. By holding data for a plurality of lines, it is possible to give a correlation to the luminance signal between the lines.

Further, according to the present invention, since the color difference signals for a plurality of continuous dots output from the conversion means can be filtered, the color difference signals can be correlated in the horizontal direction.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the display data conversion device of the present invention will be described with reference to FIG.

FIG. 1 is a diagram showing the configuration of an embodiment of the present invention. The same components as those of the conventional display conversion device shown in FIG. 3 are designated by the same reference numerals.

In FIG. 1, reference numeral 1 denotes a display control means, which can output display data in which y lines each consisting of x dots form one screen. The display data output from the display control means are R data 101 and G data 10.
2 and B data 103 form one set, and display data for one dot is obtained. Reference numeral 2 is a conversion means, and R data 10
1, G data 102 and B data 103, a luminance signal (Y) 104, a color difference signal (Cr) 107, and a color difference signal (C
b) can be separated into 108. Reference numeral 3 is a one-line delay means, which can delay the luminance signal (Y) 104 by one line. Reference numeral 4 is also a 1-line delay means, which delays the 1-line delayed luminance signal 105 output from the 1-line delay means 3 by 1 line and delays the 2-line delayed luminance signal 1 by 1.
It is possible to output 06. Reference numeral 5 denotes a vertical direction filter means, which can filter the luminance signal (Y) 104, the delayed luminance signal 105 for one line and the delayed luminance signal 106 for two lines, and output one luminance signal 109 to the display means 7. . Reference numeral 6 denotes a horizontal direction filter means, which filters the color difference signal (Cr) 107 or the color difference signal (Cb) 108 of a plurality of dots adjacent in the horizontal direction to form one color difference signal (Cr) 115 or color difference signal (Cb) 116. Can be output. 14 is a selection means, which is a color difference signal (Cr)
It is possible to select either 115 or the color difference signal (Cb) 116 and output the signal as the color difference signal 110 to the display means 7.

The selected color difference signal changes with time. For example, the color difference signal (C
r) 115 and the color difference signal (Cb) 116 are alternately output.

The operation of the display data conversion apparatus 100 configured as above will be described below.

R data 1 output from the display control means 1
01, G data 102 and B data 103 are converted by the conversion means 2 into a luminance signal (Y) 104 and a color difference signal (Cr) 10.
7 and the color difference signal (Cb) 108.

From the vertical filter means 5, the luminance signal (Y) 104 output from the converting means 2 and the delayed luminance signal 105 for one line output from the one-line delay means 3 are outputted.
Then, a luminance signal 109 obtained as a result of filtering the luminance signals for three lines by performing a product-sum operation of the delayed luminance signals 106 for two lines output from the one-line delay means 4 is output to the display means 7. It

On the other hand, in the horizontal direction filter means 6, for each of the color difference signals (Cr) 107 and the color difference signals (Cb) 108, the color difference signals (results obtained by filtering the color difference signals for a plurality of consecutive dots in the horizontal direction) ( Cr) 1
15 and the color difference signal (Cb) 116 are output. Either the color difference signal (Cr) 115 or the color difference signal (Cb) 116 is selected from the selection means 14, and the color difference signal 11 is selected.
0 is input to the display means 7.

Then, the R data 101 and the G data 102
And B data 103 is the display data conversion device 100,
The luminance signal 109 that is correlated in the vertical direction and the color difference signal 110 that is correlated in the horizontal direction are converted, and an image is displayed on the display means 7 based on these signals.

Next, display data for a personal computer screen will be briefly described with reference to FIG.

FIG. 5 is a diagram showing a format of display data for a personal computer screen. When the screen of the personal computer is in the graphic mode of (horizontal x vertical) = (640 x 480), the image data is 800 dots x 52
It is generally composed of 5 lines. As shown in FIG. 5, the image data has 160 dots in the image data of 800 dots in the horizontal direction, and 45 lines in the image data of 525 lines in the vertical direction, respectively for the horizontal blanking period and the vertical blanking period (actually Image data that is not displayed), and other image data, that is, 640 dots × 4.
The image data of 80 lines is an effective screen (image data actually displayed on the screen).

Next, the operation of the vertical filter means 5 will be described in more detail with reference to FIGS. 1, 5 and 6 (a).

The display data for a personal computer, which is composed of 800 dots × 525 lines described above with reference to FIG. 5, will be described as an example.

FIG. 6A is a diagram showing the display position on the effective screen when the luminance signal (Y) 104 output from the conversion means 2 is displayed on the screen.

Now, from the conversion means 2, 164 of the third line
It is assumed that the dot luminance signal is being output. Then 1
From the line delay means 3, one line (800 dots)
The previous luminance signal, that is, the luminance signal of 164 dots in the second line is output. Further, at the same time, the 1-line delay means 4 outputs a luminance signal of 2 lines (1600 dots) before, that is, a luminance signal of 164 dots of the 1st line.

Further, the vertical direction filter means 5 has a structure shown in FIG.
The 164 dot luminance signal of the first line, the 164 dot luminance signal of the second line, and the 164 dot luminance signal of the third line shown in FIG.

Then, the vertical direction filter means 5 filters the three luminance signals by the following equation.

A × (luminance signal of 164 dots on the first line) + b × (luminance signal of 164 dots on the second line) + c × (luminance signal of 164 dots on the third line) (1) , A, b, c represent arbitrary coefficients.

As an example of a, b, c, a = 1/4, b
= 1/2, c = 1/4, and the like.

When the coefficient is a power of 2 as in the above example, the product-sum calculation means can be configured only by shifts and adders that do not use multipliers, and the circuit configuration becomes very simple. .

Then, from the converting means 2, the first line of the third line
A brightness signal of 65 dots is output. At this time, the 1-line delay means 3 outputs a 165-dot luminance signal for the second line. At the same time, the 1-line delay means 4
Outputs a 165-dot luminance signal for the first line.

Then, in the vertical direction filter means 5, a luminance signal of 165 dots in the first line and a 165 pixel in the second line
The luminance signal of dots and the luminance signal of 165 dots in the third line are simultaneously input, and the three luminance signals are filtered to obtain one luminance signal 109.

By repeating the above operation, the luminance signal of the display data for the personal computer is converted into a signal correlated in the vertical direction.

The luminance signal 109 output from the vertical direction filter means is expressed by a general formula: (luminance signal 109) = a × (luminance signal (Y) 104) + b × (delayed luminance signal for one line) 105) + c × (delayed luminance signal 106 for two lines).

Next, regarding the horizontal direction filter means 6,
A more detailed description will be given with reference to FIGS. 2 and 6B.

FIG. 2 is a diagram showing the construction of an embodiment of the horizontal filter means 6 of the present invention. As shown in FIG.
Is a 1-dot delay means, which can delay the color difference signal (Cr) 107 by 1 dot. Reference numeral 9 denotes a 1-dot delay means, which can further delay the 1-dot delay color difference signal (Cr) 111 by 1 dot. 10 is a product-sum calculation means,
The color difference signal (Cr) 107 and the 1-dot delay color difference signal (C
r) 111 and 2-dot delayed color difference signal (Cr) 112 can be filtered and a color difference signal (Cr) 115 can be output.

Since the configurations of the 1-dot delay units 11 and 12 and the product-sum calculation 13 are the same as the configurations of the 1-dot delay units 8 and 9 and the product-sum calculation 10, their description will be omitted.

The operation of the horizontal filter means configured as described above will be described. The color difference signal (Cr) 107 output from the converting means 2 shown in FIG. 1 is input to the sum-of-products calculating means 10 simultaneously by passing through the 1-dot delay means 8 or 9 to obtain the color-difference signals for 3 dots. .

For example, as shown in FIG. 6 (b),
It is assumed that the conversion unit 2 outputs a color difference signal of 165 dots on the second line. At this time, the product-sum calculation means 1
In 0, the color difference signal of 163 dots on the second line output two dots before, the color difference signal of 164 dots on the second line output one dot before, and the color difference signal of the second line output now Color difference signals of 165 dots are simultaneously input.
Then, the sum-of-products calculation means 10 filters the three color difference signals by the following equations, similarly to the vertical direction filter means 5 described above.

A × (color difference signal of 163 dots in the second line) + b × (color difference signal of 164 dots in the second line) + c × (color difference signal of 165 dots in the second line) (2) , The color difference signal (Cb) 108
r) The same filtering process as 107 is performed, and the color difference signal (Cb) 116 is output from the horizontal filter means.

As is clear from the above description, in the display data conversion apparatus according to the embodiment of the present invention, the display data consisting of one set of R, G and B data is converted into the luminance signal (Y) 1.
04, color difference signal (Cr) 107, color difference signal (Cb) 10
After separation into 8, the vertical filtering process is performed only on the luminance signal. Therefore, the memory forming the display data conversion device only needs to be able to store the luminance signal for two lines. Therefore, the memory capacity of the display data converter can be minimized.

For example, in the conventional display data conversion device, the R, G, B data had to be stored for two lines, but in the case of the R, G, B data, the luminance information and the color difference information are included. Therefore, it required a large amount of capacity. From this point of view, it is obvious that the required memory capacity can be suppressed by adopting the configuration of the present invention.

Further, when the display data for the personal computer of the present invention is displayed on the television screen based on the luminance signal 109 and the color difference signal 110 obtained through the display data conversion device 100, the luminance which causes flicker. Since the signal 109 is correlated in the vertical direction, the occurrence of flicker can be suppressed. Moreover, since the color difference signals 110 are correlated in the horizontal direction, the color difference signals given when displaying each dot are the same as the color difference signals (Cr) 115 or the color difference signals (Cb) 11 in the adjacent dots.
Even if it is different from 6, it is possible to suppress color unevenness that occurs in the horizontal direction.

In the above embodiment, the data for displaying the television image for one line is filtered in the vertical direction based on the data for displaying the personal computer for three lines. The number of lines is not limited to three. There is no problem with data for multiple lines. The same applies to the horizontal filtering process.

In addition, in order to filter the display data of the second line in the vertical direction on the television screen, in the above embodiment, the display data of the first to third lines including the second line are filtered. However, it is clear that the same effect can be obtained by using the third to seventh lines to filter the display data of the second line. That is, there is no problem even if the display data of a plurality of lines that does not include the data of the d-th line is used and converted into the display data of the d-th line.

However, in this case, when comparing the case of displaying the image on the screen for the personal computer with the case of displaying the same display data on the television, the deviation occurs in the vertical direction (or the horizontal direction). However, there is no problem because it does not affect the image quality.

In this embodiment, the luminance signal (Y) 1 is directly applied to the vertical direction filter means 5 without the delay means.
Although 04 is input, it goes without saying that direct input can be expressed by inputting the luminance signal (Y) through the delay unit for 0 lines.

In the above embodiment, the product-sum calculation means is used as the filter means, but the product-sum calculation means includes all means capable of performing four arithmetic operations.

[0067]

According to the present invention, since color data can be converted into a luminance signal and a color difference signal and one luminance signal can be output from the luminance signals for a plurality of lines only for the luminance signal, display data conversion The memory constituting the device may be capable of storing only a luminance signal for a plurality of lines. Therefore, it is possible to provide a display data conversion device that can minimize the memory capacity.

Furthermore, according to the present invention, the color difference signals can be correlated in the horizontal direction, so that it is possible to provide a display data conversion device capable of converting the display data into the display data that suppresses color unevenness in the horizontal direction.

Therefore, when the display data conversion apparatus of the present invention converts the display data for a personal computer into an image and displays it on a television receiver, there is no flicker, no garbling, and a high-quality image. Can be projected.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of an embodiment of a display data conversion device of the present invention.

FIG. 2 is a diagram showing the configuration of an embodiment of horizontal filter means of the display data conversion apparatus of the present invention.

FIG. 3 is a diagram showing a configuration of a conventional display data conversion device.

FIG. 4 is a diagram showing a scanning system of a personal computer and a scanning system of a television.

FIG. 5 is a diagram showing a format of display data for a personal computer screen.

FIG. 6 is a diagram showing a display position of a luminance signal or a color difference signal on an effective screen.

[Explanation of symbols]

 1 Display Control Means 2 Conversion Means 3 1 Line Delay Means 4 1 Line Delay Means 5 Vertical Direction Filter Means 6 Horizontal Direction Filter Means 7 Display Means 8 1 Dot Delay Means 9 1 Dot Delay Means 10 Product Sum Calculation Means 11 1 Dot Delay Means 12 1-dot delay means 13 Product-sum operation means 14 Selection means 22 1-line delay means 23 1-line delay means 24 Vertical direction filter means 25 1-line delay means 26 1-line delay means 27 Vertical-direction filter means 28 1-line delay means 29 1 Line delay means 30 Vertical direction filter means 31 Conversion means 100 Display data conversion device 200 Display data conversion device

Claims (6)

[Claims] 1. A conversion means for converting display data, which is a set of red data, green data, and blue data into a luminance signal and a color difference signal, and a luminance signal output from the conversion means, respectively, m, ..., N. (M <n, m is 0 or a natural number, and n is a natural number).
A display data conversion device comprising: means for simultaneously outputting luminance signals for −m + 1) lines; and filter means for outputting one luminance signal from the luminance signals for (n−m + 1) lines. 2. A conversion means for converting display data having a set of red data, green data and blue data into a luminance signal and a color difference signal, and a luminance signal output from the conversion means respectively m, ..., N ( When m <n, m is 0 or a natural number, and n is a natural number.
means for simultaneously outputting luminance signals for m + 1) lines,
A display data conversion apparatus, comprising: a filter unit that filters the luminance signals of the (n−m + 1) lines by a product-sum operation and outputs one luminance signal. 3. Red data, green data and blue data are set as one set, and conversion means for converting display data for a progressive scanning system into a luminance signal and a color difference signal, and a luminance signal output from the conversion means are respectively m. ,, n (m <n, m
Represents 0 or a natural number, and n represents a natural number) and delays the lines by (n-m + 1) lines to simultaneously output the luminance signals and the (n-m + 1) lines of the luminance signals. A display data conversion device comprising: filter means for performing a filtering process according to the above, and outputting one luminance signal. 4. A conversion means for converting display data having a set of red data, green data and blue data into a luminance signal and a color difference signal, and color difference signals output from the conversion means are p, ... When p <q, p represents 0 or a natural number, and q represents a natural number. The color difference signal is delayed by dots, and the color difference signals of consecutive (q-p + 1) dots in the horizontal direction are filtered to output one color difference signal. And a display data conversion device including: 5. A conversion means for converting display data having a set of red data, green data and blue data into a luminance signal and a color difference signal, and a luminance signal output from the conversion means are m, ... When m <n, m is 0 or a natural number, and n is a natural number.
means for simultaneously outputting luminance signals for m + 1) lines,
First filtering means for filtering the luminance signal of the (n-m + 1) lines and outputting one luminance signal;
The color difference signals output from the conversion means are respectively p,
, Q (p <q, p is 0 or a natural number, and q is a natural number) is delayed by dots, and the color difference signals of (q−p + 1) consecutive dots in the horizontal direction are filtered.
A display data conversion device comprising: a second filter means for outputting one color difference signal. 6. The display data of y (y represents a natural number) lines consisting of 1 line (x represents a natural number) dots, each of which includes one set of red data, green data and blue data.
Display control means for sequentially outputting for each line, conversion means for converting an output from the display output means into a luminance signal and a color difference signal, and delaying the luminance signal by one line to output a one-line delayed luminance signal. Means for delaying the luminance signal by two lines and outputting a two-line delayed luminance signal; filtering the luminance signal, the one-line delayed luminance signal, and the two-line delayed luminance signal by a product-sum operation; The first filter unit that outputs one luminance signal and the color difference signal that is output from the conversion unit are delayed by one dot, and
A means for outputting the dot-delayed color difference signal; a means for delaying the color-difference signal output from the conversion means by 2 dots to output a 2-dot delayed color-difference signal; the color-difference signal; and the 1-dot delayed color-difference signal, A display data conversion device comprising a second filter that filters the 2-dot delayed color difference signal by a product-sum operation and outputs one color difference signal.