JPH07104706A - Liquid crystal display - Google Patents

Abstract

(57) [Summary] [Object] To provide a liquid crystal display device capable of receiving and displaying an interface signal having a resolution different from that of the liquid crystal display device. [Configuration] The CPU 101 outputs display data of 1120 × 780 dots. The liquid crystal panel 7 has display dots of 1024 × 768 dots which are smaller than the above resolution. The display screen of the liquid crystal panel 7 is composed of a plurality of linearly arranged pixels. The data conversion unit 4 receives the above-mentioned display data corresponding to the dots at the corresponding positions of the two adjacent lines, creates one display data, and converts the above two display data into the above-mentioned 1 Replace with the display data for the book.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device used as a display device of a personal computer or the like, and a display system when the resolution of display data output from a computer main body is different from that of the liquid crystal display device.

[0002]

2. Description of the Related Art A conventional liquid crystal display device receives an interface signal including display data and timing signals output from a computer main body, converts the interface signal into a drive signal for liquid crystal display, and supplies it to a liquid crystal drive means. The liquid crystal drive means converts the display data of the applied drive signal into a liquid crystal drive voltage according to the display data and outputs it to the liquid crystal panel. The liquid crystal panel receives the liquid crystal drive voltage and displays an image. Here, when the resolution of the input interface signal and the liquid crystal panel are different, for example, when the resolution of the input interface signal is higher than the resolution of the liquid crystal panel, as described in JP-A-57-115593, the input is performed. A part of the display data included in the interface signal is deleted to match the resolution of the liquid crystal panel. In this conventional example, the display target is limited to the character, and the dots in the blank portion around the character are deleted for each type of character. The part to be deleted had to be specified for each character type.

[0003]

In the above-mentioned conventional example, there is a problem in that characters are targeted and display data other than characters are not considered. An object of the present invention is to provide a liquid crystal display device that can receive and display an interface signal having a resolution different from that of the liquid crystal display device regardless of the type of display data.

[0004]

In order to solve the above-mentioned problems, display data having a predetermined first resolution output from an external data output means is received, and second display data having a resolution smaller than the first resolution is received. And a liquid crystal display that performs display based on the display data, and the display screen of the liquid crystal display is a liquid crystal display device that is composed of dots arranged in a plurality of lines. Based on the display data displayed on the corresponding m arranged dots in the linear shape, display data of n lines (n <m) is created, and k lines of the display data of the m lines (( n <k ≦
The data conversion means for replacing the display data of m) with the display data for the above n lines is provided.

[0005]

The data converting means converts the display data sent from the main body of the personal computer or the like into display data using halftone data so as to match the resolution of the liquid crystal display device. Therefore, assuming that the output device has a resolution different from that of the liquid crystal display device, the display data output by the personal computer main body or the like can be displayed on the liquid crystal display device.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a personal computer system to which the liquid crystal display device of the present invention is connected will be described with reference to FIGS. FIG. 1 is a block diagram of a personal computer system to which the present invention is applied. Reference numeral 1 is a personal computer or workstation main body (hereinafter referred to as PC) equipped with a central processing unit (hereinafter referred to as CPU) 101 and the like, and 2 is Display data, 3 is a timing signal, 4 is P
A data conversion unit for converting the display data of C1 into a signal for liquid crystal display, 5 is liquid crystal display data, 6 is a liquid crystal display timing signal, and 7 is a liquid crystal panel. The data converter 4 and the liquid crystal panel 7 constitute a liquid crystal display device. Data converter 4
Generates the liquid crystal display data 5 and the liquid crystal display timing signal 6 obtained by enlarging / reducing the display data 2 from the PC 1 according to the resolution of the liquid crystal panel 7. LCD display data 5,
The liquid crystal display timing signal 6 is collectively called a drive signal. The conversion into the liquid crystal drive voltage described above is performed within the liquid crystal panel 7. Here, it is assumed that the display data 2 has 4-bit gradation data for each color of red (hereinafter R), green (hereinafter G), and blue (hereinafter B) and is serially sent in synchronization with the timing signal 3. This will be described below. Further, for simplification of the following description, the liquid crystal display 7 has 1024 ×.
It is composed of pixels of 768 dots, and the PC 1 has 1120 × 780 dots (hereinafter referred to as display mode 1) or 640 × 480 dots (hereinafter referred to as display mode 2) depending on the display mode.
(Hereinafter referred to as "display data") and the timing signal. FIG. 2 is a diagram showing a display mode of the present invention,
The data conversion unit 4 determines the display mode, and executes the reduction process in the display mode 1 and the enlargement process in the display mode 2 according to the display mode. In addition, the liquid crystal panel 7 can display 4096 colors, and the PC 1 represents R (red), G (green), and B (blue) per pixel with 4-bit attributes (grayscale data), and is horizontally represented from left to right. It is assumed that a so-called raster operation is performed, in which one pixel is sequentially output to and the horizontal line is sequentially repeated from top to bottom.

Two operation examples of the data conversion section 4 will be sequentially described below. First, as a first operation example, a halftone line replacement / insertion method will be described with reference to FIG. FIG. 3 shows halftone line replacement in display mode 1, display mode 2
FIG. 10 is a diagram showing a state of insertion at the time of, and 8 and 9 are first and second horizontal extraction lines showing horizontal replacement or insertion positions,
10 and 11 are the first, which represents the replacement or insertion position in the vertical direction,
The second vertical extraction line, 12 is the horizontal halftone line that calculates the halftone of the first and second horizontal extraction lines 8 and 9, and 13 is the vertical that calculates the halftone of the first and second vertical extraction lines 10 and 11. It is a halftone line, and in display mode 1, horizontal,
Horizontal and vertical halftone data lines are respectively generated from the vertical extraction first and second lines, and the first horizontal extraction line 8 is replaced with a horizontal halftone line 12 and the first vertical extraction line 10 is replaced with a vertical halftone line 13. , The second extraction horizontal and vertical lines 9 and 11 are deleted to implement the reduction processing, and the halftone lines are inserted between the extraction lines to implement the enlargement processing. The positions of the extraction lines may be arbitrarily set at equal intervals, or lines having a small amount of display data may be determined. FIG. 4 is a diagram showing a method of determining the position of the horizontal / vertical extraction line to be replaced / deleted from the amount of display data.
Is the number of pixels in which a color different from the background color is displayed for each vertical line, 15 is the number of pixels in which a color different from the background color is displayed for each horizontal line, 1
Reference numeral 6 is the position of the horizontal and vertical lines for insertion and deletion determined from the integration results 14 and 15, and indicates that the position where the display data is as small as possible is determined as the replacement or insertion position. Further, on the screen where the window is displayed, the outside of the window area may be detected and set as the insertion position. FIG. 5 shows a method of calculating halftones. For example, Figure 5 (1)
To create a halftone pixel from the two pixels shown in, the average value of each attribute of RGB

[0008]

[Equation 1]

It is sufficient to calculate A halftone line can be calculated by repeating this calculation for pixels forming one line. In addition, at the points where horizontal and vertical lines intersect,
Even when calculating a halftone from multiple pixels as shown in (2), the average of the attribute data for 4 pixels

[0010]

[Equation 2]

May be halftone pixel data. Also,
When calculating the average value, a fractional part after the decimal point may occur. However, it is desirable that the fractional processing be changed in the direction in which a color different from the background color is output depending on the attribute of the background color. For example, the background is black (R = 00
In the case of 0, G = 000, B = 000), rounding up or rounding off when calculating the average value of each of RGB, and in the case of white (R = 111, G = 111, B = 111), rounding down is performed. , A color different from the background color can be displayed. When the background color is blue (R = 000, G = 000, B = 111) and the attribute is different for each RGB color, the rounding up process is performed when calculating the tone of RG, and the rounding down process is performed when calculating B. Distribute processing to. Furthermore, a second method in which the number of extraction lines is three in the reduction processing will be described with reference to FIG. Here, only horizontal lines will be described as an example, but similar processing is performed for vertical lines. In FIG. 6, 17, 18, 19 are first, second, and third extraction lines, and 20 is a halftone line obtained by averaging the display data of these three lines. The second extraction line 18 is a halftone data line. Reduction processing is realized by replacing the third extraction line 19 with 20. Since the same processing is performed in the vertical direction, the average of the display data of 9 pixels may be calculated at the intersections of the extraction lines. The method of obtaining the halftone data is the same as in the first example. Next, an embodiment of the hardware configuration of the data conversion unit 4 for realizing the first example will be described with reference to FIGS. Figure 7 shows display mode 1
21 is an example of the internal configuration of the data conversion unit 4 in the case of realizing
2 is G display data, 23 is B display data, 24 is R data converter, 25 is G data converter, 26 is B data converter, 27 is B liquid crystal display data, 28 is G liquid crystal display data, and 29 is R. Liquid crystal display data, 51 is a display mode discriminating unit, 52 is a display mode signal, 30 is a liquid crystal display timing signal generating unit, 31 is a liquid crystal display timing signal, and the display mode discriminating unit 51 discriminates the display mode from the timing signal 3. Then, the display mode signal 52 is output. The data conversion units 24, 25, 26 respectively display data 21, 22, 22, respectively.
23 is processed independently of R, G, and B according to the resolution represented by the display mode signal 52. The liquid crystal display timing signal generation unit 30 uses the timing signal 3 to the display mode signal 5
A liquid crystal display timing signal 6 corresponding to the output resolution represented by 2 is generated.

FIG. 11 shows an embodiment of the internal structure of the R data converter 24, and the G data converter 25 and the B data converter 26 have the same structure. In FIG. 11, 53 is a reduction processing unit, 54 is an enlargement processing unit, 55 is reduced display data, 5
6 is enlarged display data, 57 is a resolution switching means, and when the display mode signal 52 represents the display mode 1, the reduction processing unit 53 converts the R display data 21 into reduced display data 55, and at this time, the enlargement processing unit 54. Does not work. When the display mode signal 21 indicates the display mode 2, the enlargement processing unit 54 converts the R display data 21 into the enlargement display data 56,
At this time, the reduction processing unit 53 does not operate. In accordance with the display mode signal 52, the resolution switching means 57 outputs the reduced display signal 55 when displaying the display mode 1 and the enlarged display signal 56 when displaying the display mode 2 as the R liquid crystal display signal 29. In the present embodiment, the reduction processing unit 53 and the enlargement processing unit 54 are provided in order to support two display modes, but by providing some reduction processing units or enlargement processing units, other resolutions are also supported. can do.

FIG. 8 shows an embodiment of the internal structure of the reduction processing section 53. Here, the arrangement of dots in the horizontal direction of the display data will be referred to as a line, which will be described below. That is, the liquid crystal panel 7 used in the present invention has 1024 dots × 768 lines. In FIG. 8, 32 is a latch,
33 is the previous dot data, 34 is the horizontal calculation unit, 35 is horizontal halftone data, 36 is horizontal selector, 37 is horizontal data, 38 is line memory, 39 is vertical selector, 40 is previous line data, 41 is horizontal for calculation. Reference numeral 42 is a vertical operation unit, 43 is vertical halftone data, 44 is output horizontal data, and 45 is an output selector. Since the latch 32 latches the R display data 21, the output outputs the previous dot data 33 which is the display data for one dot before. The horizontal calculator 34 calculates the previous dot data 33 and the R display data 21, and outputs horizontal halftone data 35. Horizontal selector 3
Reference numeral 6 selects either the horizontal halftone data 35 or the R display data 21 according to the position of the R display data 21 on the liquid crystal panel 7 and outputs it as horizontal data 37. Details will be described later. The line memory 38 stores the horizontal data 37 for one line and reads it when the display data of the next line is input, that is, outputs it as the previous line data 40 which is the data one line before. Vertical selector 39
Is output to either the vertical calculation unit 42 or the output selector 45 depending on the position of the horizontal data 37 on the liquid crystal panel 7. Details will be described later. The vertical calculation unit 42 calculates the front line data 40 and the calculation horizontal data 41 and outputs it as vertical halftone data 43. The output selector 45 outputs either the vertical halftone data 43 or the output horizontal data 44 as the R liquid crystal display data 29 depending on the position of the R display data 21 on the liquid crystal panel 7. Details will be described later. FIG. 12 shows the enlargement processing unit 5.
4 is an example of an internal configuration of No. 4. 58 is a frame memory for halftone data, 59 is a frame memory for display data,
Reference numeral 60 is halftone read data, 61 is display read data, and other configurations are the same as those of the reduction processing unit 53.

In FIG. 12, the latch 32 and the vertical calculator 34 operate in the same manner as the reduction processing, and the horizontal selector 36.
If the R display data 21 is data on the first vertical extraction line, after outputting the R display data 21, the halftone horizontal data 35 is output before the R display data 21 of the next dot comes,
Insert a vertical line. The line memory 38, the vertical selector 39, and the vertical calculation unit 42 perform the same operation as the reduction processing, and the vertical halftone data 43 is stored in the halftone data frame memory 58, and the output horizontal data 44 is stored in the display data frame memory 59. One screen is stored, and when the display data of the next one screen is input, the horizontal halftone read data 60 is read so as to be inserted at an arbitrary position between the display read data 61, thereby inserting a horizontal line.

Details of the operation relating to the reduction processing by the halftone replacement will be described with reference to FIGS. In FIG. 1, the data conversion unit 4 converts the display data 2 and the timing signal 3 into liquid crystal display data 5 and liquid crystal display timing signal 6 which match the output liquid crystal panel 7. In FIG. 7, the display mode determination unit 51 determines the display mode from the timing signal 3 and generates the display mode signal 52 that matches the resolution of the liquid crystal panel 7 to be displayed. The display mode can be determined by counting the number of clocks of the timing signal 3, or the display mode signal 52 can be externally provided without the display mode determination unit 51. The display data 2 includes R data converter 24, G data converter 25, and B data converter 26 independently of R, G, and B.
Is input to the display mode signal 52 and is converted into liquid crystal display data 5 in accordance with the display mode represented by the display mode signal 52. Further, the liquid crystal display timing signal generation unit 30 generates the liquid crystal display timing signal 6 that matches the display mode represented by the display mode signal 52 from the timing signal 3. Details of the display data conversion operation of the R data conversion unit 24 will be described with reference to FIG. The G data conversion unit 25 and the B data conversion unit 26 have the same operation. In FIG. 11, the reduction processing unit 53 operates when the display mode signal 52 indicates the display mode 1, and generates reduced display data 55. The enlargement processing unit 54 operates when the display mode signal 52 indicates the display mode 2, and produces enlarged display data 56. The resolution switching means 57 selects and outputs the reduced display data 55 in the display mode 1 and the enlarged display data 56 in the display mode 2 according to the display mode signal 52. As described above, a data conversion unit corresponding to any resolution can be configured by further providing some reduction processing units and enlargement processing units. Details of the operation of the reduction processing unit 53 will be described with reference to FIG. In FIG. 8, since the latch 32 latches the input R display data 21, the data output by the latch 32 corresponds to the data one dot before the R display data 21, and the previous dot display data 33.
Becomes The horizontal calculation unit 34 uses the previous dot display data 33, R
The halftone data of the display data 21 is calculated and output as horizontal halftone data 35. The horizontal selector 36 outputs the horizontal halftone data 35 if the R display data 21 is the data on the first vertical extraction line, and outputs neither if it is the data on the second vertical extraction line. If it is not the above data, the R display data 21 is output as horizontal data 37. Line memory 38 has horizontal data 3
7 is stored for one line and is read when the horizontal data 37 of the next line is input, so the data output from the line memory 38 is the front line display data 40 one line before the horizontal data 37. If the horizontal data 37 is data on the first horizontal extraction line, the vertical selector 39 does not output it to either, but if it is data on the second horizontal extraction line, it outputs it to the vertical calculation unit 42 as horizontal data 41 for calculation. Output selector 4 if it is not data on either extraction line
5 as the output horizontal data 44. Vertical calculation unit 4
2 calculates halftone data of the front line data 40 and the calculation horizontal data 41 and outputs it as vertical halftone data 43. If the horizontal data 37 is the data on the first horizontal extraction line, the output selector 45 outputs neither, and if it is the data on the second horizontal extraction line, it outputs the vertical halftone data 43, on which horizontal extraction line. If it is not data, the output horizontal data 44 is output. By the above operation, the reduction processing by the halftone replacement shown in FIG. 3 can be realized. Details of the enlargement process by halftone insertion will be described with reference to FIG. In FIG. 12, the latch 32 and the vertical calculation unit 34 operate in the same manner as the reduction processing, and the horizontal selector 36 outputs the R display data 21 if the R display data 21 is data on the first vertical extraction line, and then R dot display data 21
It is possible to insert a vertical line by outputting the halftone horizontal data 35 before the time comes. The line memory 38, the vertical selector 39, and the vertical calculation unit 42 perform the same operation as the reduction processing, and the vertical halftone data 43 is stored in the halftone data frame memory 51, and the output horizontal data 44 is stored in the display data frame memory 52. A horizontal line can be inserted by storing one screen and reading it so that the vertical halftone read data 54 is inserted at an arbitrary position between the output horizontal read data 53 when the display data of the next one screen is input. . Further, when the insertion lines are at equal intervals, for example, when one halftone data is inserted in n lines, (n + 1) line memories are provided, the halftone data and the line data to be inserted are stored, and the next data is stored. At the time of input, by reading data for (n + 1) lines including halftone line data while storing for n lines, horizontal lines can be inserted without having a frame memory. The data conversion unit 4 that performs the above processing may be software using the CPU 101 or may be configured by hardware. Further, it may exist in the PC 1 or may be built in the liquid crystal panel 7.

As a second example, a method of converting resolution using a low pass filter will be described with reference to FIG. FIG. 9 shows an R data conversion unit 2 using a low pass filter.
4 is a diagram showing an internal configuration of 4, in which 46 is a D / A converter, 4
7 is analog R display data, 48 is a low pass filter,
49 is smoothed R display data, 50 is an A / D conversion unit, and the display mode determination unit 51 is similar to the operation described above. The D / A converter 46 temporarily converts the digitally output R display data 21 into analog R display data 47.
The low-pass filter 48 uses the analog R display data 4
7 is smoothed. Finally, the liquid crystal display timing signal 6 matched with the resolution of the liquid crystal display is used, and the signal is again converted into a digital signal by the A / D conversion circuit. If the frequency of the liquid crystal display timing signal 6 is higher than that of the input timing signal 3, the enlargement process is performed, and if it is low, the reduction process is performed. FIG. 10 shows an example of signal conversion of display data during enlargement processing. Since the liquid crystal timing signal 6 having a higher frequency than the timing signal 3 is used, the enlarged R display data 29 is generated. The scaling method described above is based on the PC1
Although the enlargement / reduction processing is executed so that the display data output from the device is directly equalized with the resolution of the liquid crystal panel, a method of executing the enlargement / reduction stepwise may be used. For example, when converting the display data represented by 640 × 480 dots to 1120 × 780 dots, first, the display data is once enlarged to 1280 × 960 dots, which is twice as large, and this enlarged data is converted to 1120 × 78 dots.
It may be reduced to 0 dots. 1120 x 780 from the beginning
If you try to enlarge to dots, it takes a lot of time to insert because there are many lines to be inserted, but to enlarge to 1280 x 960 dots, which is twice as fast, the processing is simple and fast processing is possible. Since it's good, it can be processed quickly as a whole. On the contrary, when the resolution of the liquid crystal panel 7 of FIG. 1 is 640 × 480 dots and the display data of 1120 × 780 dots is output from the PC 1, the reduction processing is executed in the completely opposite procedure, Fast processing is possible. In the present invention, by providing a means for judging what resolution the display data supplied to the liquid crystal display has, for example, a means for judging from the timing signal input from the computer main body, It is possible to determine how to adjust the resolution.

[0017]

As described above, by enlarging / reducing the display data using various algorithms, it is possible to display even the display data output assuming a resolution different from that of the liquid crystal display device. Like That is, a liquid crystal display device capable of multi-scan display can be provided. Also, considering the current situation that many software are already in circulation, by adopting this method,
Since a large number of software can be modified and multi-scan can be realized without outputting a signal matching the resolution of the liquid crystal display device from the computer main body, an inexpensive system can be provided.

[Brief description of drawings]

FIG. 1 is a block diagram of a system to which the present invention is applied.

FIG. 2 is an explanatory diagram showing a target resolution of this embodiment.

FIG. 3 is an explanatory diagram of reduction / enlargement by halftone replacement / insertion.

FIG. 4 is an explanatory diagram of a method of detecting a line with a small amount of display data.

FIG. 5 is an explanatory diagram of a halftone pixel calculation method.

FIG. 6 is an explanatory diagram of halftone replacement by extracting three lines.

FIG. 7 is a block diagram showing an internal configuration of a data conversion unit.

FIG. 8 is a block diagram showing an internal configuration of a reduction processing unit.

FIG. 9 is a block diagram of a DAD conversion system.

FIG. 10 is an explanatory diagram of a DAD conversion operation.

FIG. 11 is a block diagram showing an internal configuration of an R data conversion unit.

FIG. 12 is a block diagram showing an internal configuration of an enlargement processing unit.

[Explanation of symbols]

4 ... Data conversion unit, 7 ... Liquid crystal panel, 24 ... R data conversion unit, 30 ... Liquid crystal display timing signal generation unit, 32 ... Latch, 34 ... Horizontal operation unit, 36 ... Horizontal selector, 38 ...
Line memory, 39 ... Vertical selector, 42 ... Vertical operation section, 45 ... Output selector, 46 ... Digital / analog conversion, 48 ... Low-pass filter, 50 ... Analog / digital conversion section, 101 ... CPU.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor ▲ Hiroyuki Mano 292 Yoshida-cho, Totsuka-ku, Yokohama, Kanagawa Pref., Hitachi, Ltd. Microelectronics Equipment Development Laboratory (72) Inventor Shigeyuki Nishitani Yokohama, Kanagawa 292, Yoshida-cho, Totsuka-ku, Hitachi, Ltd., Microelectronics Equipment Development Laboratory, Hitachi, Ltd. (72) Inventor, Mitsutoshi Uchida, 810 Shimoimaizumi, Ebina, Kanagawa, Ltd. Kazuko Hasegawa 292 Yoshida-cho, Totsuka-ku, Yokohama City, Kanagawa Prefecture Hitachi, Ltd. Microelectronics Device Development Laboratory

Claims (13)

[Claims] 1. A display data having a predetermined first resolution output from an external data output means is received, and a second resolution smaller than the first resolution is received, based on the display data. A liquid crystal display device having a liquid crystal display for displaying, wherein the display screen of the liquid crystal display is a liquid crystal display device composed of a plurality of dots arranged in a line, and the display is performed in m adjacent dots arranged in a line. The display data for n lines (n <m) is created based on the above-mentioned display data to be displayed, and the display data for k lines (n <k ≦ m) in the display data for the above m lines is displayed for the above n lines. A liquid crystal display device having a data conversion means for replacing display data of minutes. 2. The liquid crystal display device according to claim 1, wherein m is 2, n is 1, and k is 2. 3. The liquid crystal display device according to claim 1, wherein m is 3, n is 1, and k is 2. 4. The liquid crystal display device according to claim 1, 2 or 3, further comprising: a generation means for generating display data having a third resolution which is an integral multiple of the first resolution. Is a liquid crystal display device, wherein display data having the third resolution is converted into display data having the second resolution. 5. Accepting display data having a predetermined first resolution output from an external data output means, having a second resolution higher than the first resolution, and based on the display data. A liquid crystal display device having a liquid crystal display for displaying, wherein the display screen of the liquid crystal display is a liquid crystal display device composed of a plurality of dots arranged in a line, and the display is performed in m adjacent dots arranged in a line. The display data for n lines (n <m) is created based on the displayed data and the data conversion means for adding the display data for the n lines to the display data for the m lines is provided. Liquid crystal display device. 6. The liquid crystal display device according to claim 5, wherein m is 2, n is 1, and the data conversion means creates the data between the two adjacent display data. A liquid crystal display device characterized by inserting data for one line. 7. The liquid crystal display device according to claim 5, further comprising a generation unit that generates display data having a third resolution which is 1 / p (p is an integer) times the first resolution. The data conversion means converts the display data having the third resolution into display data having the second resolution. 8. The liquid crystal display device according to claim 2, 3 or 6, wherein said data conversion means, when producing display data for one line, dots arranged in a line for said m lines. 2. A liquid crystal display device, characterized in that the average value of the display data displayed on the dots at the positions corresponding to is calculated for each position. 9. The liquid crystal display device according to claim 1, wherein the display data is data for color display, and each of the dots is composed of a plurality of color elements. The liquid crystal display device, wherein the data conversion means creates display data for n lines for each color element. 10. The liquid crystal display device according to claim 1, wherein the data conversion unit displays a screen if a fraction less than 1 occurs when creating display data for n lines. In order to increase the difference between the display data displayed in the background portion and the display data for the n lines, the display data for the n lines is rounded up or down to the nearest whole number to be an integer. Liquid crystal display device. 11. A display data having a predetermined first resolution output from an external data output means is received, and a display having a second resolution different from the above resolution is displayed based on the display data. A liquid crystal display, wherein the display screen of the liquid crystal display is composed of a plurality of dots arranged in a line, and the data output means has a frequency corresponding to the first resolution. A data conversion means for outputting the display data as a digital signal, converting the display data output by the data output means into an analog signal, and converting into a digital signal having a frequency corresponding to the second resolution. Liquid crystal display device. 12. A display data having a predetermined first resolution output by an external data output means is received, and the first resolution can take a plurality of different resolutions. A liquid crystal display having a second resolution different from the first resolution and performing display based on the display data, wherein the display screen of the liquid crystal display is a liquid crystal display composed of dots arranged in a plurality of linear shapes. A device for determining the resolution of the display data from the outside, and a data conversion unit for converting the display data so that the resolution of the display data becomes the second resolution based on the determination result. And the data converting means displays m adjacent dots arranged in a line when the first resolution is higher than the second resolution. Display data for n lines (n <m) is created based on the display data, and k lines (n
If the display data of <k ≦ m) is replaced with the display data of the above n lines and the first resolution is smaller than the second resolution, it is displayed in q lines of the above dots arranged in a line. A liquid crystal display device, characterized in that display data for r lines (r <q) is created based on the display data, and the display data for r lines is added to the display data for q lines. 13. The liquid crystal display device according to claim 1, wherein display data to be data-converted among the display data is detected based on the display data input from the outside. A liquid crystal display device comprising: