JPH10254417A - Liquid crystal display display system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To display the character data for low resolution on a high resolution liquid crystal display in the state without pulling a character shape down. SOLUTION: When a display request is performed to the high resolution display 7, the character data 1 for low resolution are sent to a character data conversion part 2. In the character data conversion part 2, a blank between the character data is calculated according to a ratio between the resolution of the displays (character interval calculation part 3), and positions of respective characters are obtained using its value (character position calculation part 4), and by drawing the character data on these positions (character drawing part 5), the drawing is performed. A display memory 6 stores the drawn character data to display them on the high resolution display 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a display system for a liquid crystal display of a computer.

[0002]

2. Description of the Related Art Conventionally, in the case of a liquid crystal display, since the size of one pixel is determined, when displaying at multi-resolution, the size displayed on the screen changes depending on each resolution, and a low-resolution display is used. The display size is so small that it is difficult to decipher the characters, and when low-resolution characters are displayed on a high-resolution liquid crystal screen, only a part of the screen is used.

In order to solve this problem, for example, as disclosed in Japanese Patent Application Laid-Open No. 07-281637, "Liquid Crystal Display / Multi-Resolution Display Method", low-resolution characters are displayed using a high-resolution liquid crystal screen. When performing display, characters displayed small on the display are enlarged to a size that is easy to see using the entire screen.

In this case, the enlargement ratio is simply calculated based on the resolution ratio. For example, if the resolution is 640 × 48
The character data for the low-resolution screen of 0 dots is 800 × 60
When displaying on a high resolution screen of 0 dots, the magnification is X
Both the axis and the Y axis are 1.25 times. Accordingly, character data is copied at a ratio of one dot to four dots, so that enlarged display is performed in response to an increase in the number of dots. At this time,
Since only part of the characters are copied, the glyphs are broken. Also,
When displaying the same character a plurality of times, some characters may not be copied and some may not be displayed depending on the position, and may be displayed as different sizes and shapes on the screen.

[0005]

In the above-described conventional liquid crystal display display method, when displaying low-resolution character data on a high-resolution liquid crystal screen, an enlargement ratio is simply calculated based on a resolution ratio, and character display is performed. Since only a part is copied and enlarged, there is a disadvantage that the character is not uniformly enlarged and displayed, and the quality of the font deteriorates, making it difficult to see.

An object of the present invention is to reduce the quality of a font by adjusting the character spacing of character data without changing the size of the character when displaying low-resolution character data on a high-resolution liquid crystal screen. It is an object of the present invention to provide a liquid crystal display display system that does not cause the problem.

[0007]

According to a first aspect of the present invention, when character data for a low-resolution liquid crystal display is displayed on a high-resolution liquid crystal display, the size of the character is not changed and only the blank portion between the characters is displayed. Character data conversion means is provided to increase the character spacing by filling dots, and the character data for the low-resolution liquid crystal display is enlarged and displayed on the high-resolution liquid crystal display in a state where the character shape is not lost.

According to a second aspect of the present invention, in the first aspect, the character data conversion means calculates the character interval using a ratio of the number of dots of the low resolution liquid crystal display to the number of dots of the high resolution liquid crystal display. It is characterized by comprising a character spacing calculating means for performing the following.

According to a third aspect of the present invention, in the second aspect, the character spacing calculating means first sets a ratio of the number of dots of the low resolution liquid crystal display to the number of dots of the high resolution liquid crystal display on the X axis and the Y axis. Then, the character spacing in the X-axis and Y-axis directions is calculated by subtracting the width of one character from a value obtained by multiplying the width of one character by the ratio.

According to a fourth aspect of the present invention, in the first and third aspects, the character data converting means includes: the character space calculating means; and the character space of the character data from the character space calculated by the character space calculating means. A character position calculating means for calculating a font drawing position and a character drawing means for drawing the character data at the calculated character position in a video memory for storing data to be displayed on a display are provided.

[Operation] Display of character data for a low-resolution screen on a high-resolution liquid crystal display is supported by increasing blank portions other than character portions. For this reason,
The character shape does not collapse.

Since the character portion is displayed as it is with its position shifted, the same character is not displayed differently depending on the display position, and the quality of the character shape can be ensured.

[0013]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a liquid crystal display display system according to the present invention.

In the embodiment of the present invention, as shown in FIG.
, A video memory 6 and a high-resolution display 7. The character data conversion unit 2 includes a character space calculation unit 3, a character position calculation unit 4, and a character drawing unit 5.

Next, the operation of the embodiment of the present invention will be described with reference to FIG.

When there is a display request on the high resolution display 7, the low resolution character data 1 is passed to the character data converter 2. The character data conversion unit 2 calculates a space between character data according to the ratio of the resolution of the display (character interval calculation unit 3), and calculates the position of each character using the value (character position calculation unit 4). Drawing is performed by drawing character data (character drawing unit 5). Display memory 6
Stores the drawn character data and displays it on the high-resolution display 7.

[0018]

Next, an embodiment of the present invention will be described with reference to a character data converter 2.
The operation will be described in detail with reference to FIGS. 2, 3, and 4. FIG. 2 is a flowchart showing the processing of the character spacing calculation unit 3 of the present invention. FIG. 3 is a flowchart showing the processing of the character position calculation unit 4 of the present invention. FIG. 4 is a flowchart showing the processing of the character drawing unit 5.

When calculating the character data interval, first, the ratio of the low-resolution screen to the high-resolution screen is calculated for the X and Y axes (steps A1 and A2).

When the low resolution is 640 × 480 dots and the high resolution is 800 × 600 dots, the ratio is 1.25 on both the X and Y axes. Next, the character spacing is calculated by subtracting the width of one character from the value obtained by multiplying the width of one character by the ratio (steps A3 and A4). When the size of the character data of one character is 16 × 16 dots, 16 dots × 1.25
With -16 dots, there are 4 dots on both the X and Y axes.

Next, a position where a space is inserted between characters is calculated for each character (steps B1 and B2).

Since blanks are added by 4 dots for each character, the drawing space is widened by the number of blanks corresponding to the number of characters.

Next, each character data is drawn at a position for each character (step C1) and stored in the video memory (step C2).

The present invention is practical when the characters for low resolution are large to some extent, and the effect is large.

[0025]

As described above, according to the liquid crystal display method of the present invention, when displaying low-resolution character data on a high-resolution liquid crystal display, the character data portion is left as it is, and dots are formed only in blank portions. By burying and widening the character space, there is an effect that the screen can be enlarged and displayed without breaking the character shape.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a liquid crystal display display system according to the present invention.

FIG. 2 is a flowchart showing a character space calculation process according to the embodiment of the liquid crystal display display system of the present invention.

FIG. 3 is a flowchart showing a character position calculating process according to the embodiment of the liquid crystal display display system of the present invention.

FIG. 4 is a flowchart showing a character drawing process according to the embodiment of the liquid crystal display method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Character data for low resolution 2 Character data conversion part 3 Character space calculation part 4 Character position calculation part 5 Character drawing part 6 Video memory 7 High resolution display

Claims (4)

[Claims] When displaying character data for a low-resolution liquid crystal display on a high-resolution liquid crystal display, a character space is not changed, and dots are buried only in blank portions between the characters so as to widen character spacing. A liquid crystal display system, comprising: a character data converting means for converting the character data for the low resolution liquid crystal display into an enlarged display on the high resolution liquid crystal display without changing the character shape. 2. The character data conversion unit includes a character interval calculation unit that calculates the character interval using a ratio of the number of dots of the low resolution liquid crystal display to the number of dots of the high resolution liquid crystal display. The liquid crystal display display method according to claim 1. 3. The character spacing calculating means calculates first the ratio of the number of dots of the low resolution liquid crystal display to the number of dots of the high resolution liquid crystal display on the X axis and the Y axis, and then calculates the width of one character. 3. The liquid crystal display display system according to claim 2, wherein the character spacing in the X-axis and Y-axis directions is calculated by subtracting the width of the one character from a value multiplied by the ratio. 4. The character data conversion means includes: a character space calculating means; a character position calculating means for calculating a character font drawing position of the character data from the character space calculated by the character space calculating means; 4. A liquid crystal display system according to claim 1, further comprising a character drawing means for drawing the character data at the calculated character position in a video memory for storing data to be displayed.