JP3763663B2 - Display control apparatus and image display apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
[0002]
The present invention relates to a display control device of an image display device that performs graphic display on a display screen.
[0003]
[Prior art]
As a conventional image display device, for example, there is an image display device shown in “Latest personal computer technology system '95” (edit: Nikkei byte, issue: 1995/6/21, pp. 87-100). As shown in FIG. 14, the image display device includes a CPU 10 that controls the entire image display device 1, a readable / writable video memory (video memory) 20 that stores image data, and a display control device that controls image display. 30, a digital-analog conversion means (DAC) 40 with a color palette, and a display means 50 such as a CRT.
[0004]
The display control device 30 transfers display data (digital display data) onto the video memory 20 in accordance with a display command from the CPU 10, and displays the display data stored in the video memory 20 in accordance with the resolution information set by the CPU 10 in a color palette. It has a function of transmitting to the attached DAC 40.
[0005]
The color palette-added DAC 40 converts the digital display data transferred from the video memory 20 into an analog signal and transmits it to the display means 50. The display means 50 displays an image according to the analog signal.
[0006]
The process of transferring the digital display data stored in the video memory 20 by the display control device 30 to the DAC 40 with color palette is performed according to the processing procedure shown in the flowchart of FIG.
[0007]
In the display process, first, display resolution (display width: X dot, number of display lines: Y line) data and display data storage address on the video memory 20 are acquired from the CPU 10 (S90). Next, the display line address counter b is set to the initial value “0” (S91), and the dot number address counter a is set to the initial value “0” (S92).
Next, an address of coordinates (a, b) is calculated (S93), and image data to be displayed is acquired from the calculated address from the video memory 20 (S94). Next, the acquired display data is transmitted to the DAC 40 with a color palette and displayed on the display means 50 (S95).
[0008]
Next, it is determined whether the dot number address count value a has reached the display width X (S96). If not, the process returns to step S92 to advance the dot number address count value a by "1" and display the corresponding address. Data is acquired and the processes of steps S93 to S95 are executed until the dot number address count value a reaches the display width X.
[0009]
When the dot number address count value a exceeds the display width X, one line of display data is read out, so it is determined whether the line number address count value b has reached the display line number Y (S97). If not, the process returns to step S91, the line number address count value b is advanced by "1", the display data of the corresponding address is acquired, and the processing of steps S92 to S96 is performed. Run until it reaches.
[0010]
By repeating the above processing, all the display data stored in the video memory 20 can be transmitted to the DAC 40 with a color palette.
[0011]
[Problems to be solved by the invention]
In the conventional display device, when the display screen becomes high resolution or the characters displayed on the small screen of the portable information terminal or the like are small, the characters are difficult to see if the application has no enlargement function, Work efficiency may be reduced.
[0012]
The present invention has been made in view of such a problem. In an image display device, an area in which a small character displayed on a small screen of an information portable terminal or the like is displayed when a display screen has a high resolution is displayed. It is an object of the present invention to provide a display control device that can be enlarged and displayed by being selected.
[0013]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides an image display device that divides a display screen stored in a video memory and manages a divided screen area, and which area of the screen is displayed. The designated display area selection input is monitored, and when there is an area selection input, based on the screen area managed by the screen area management means, the display data of the designated area is read and enlarged to the display means. Display control means for displaying is provided.
[0014]
The present invention relates to a video memory for storing display data, and a display for controlling the display data to be transferred to and stored in the video memory in accordance with a display command and to display the display data stored in the video memory for display on the display device. In a display control device of an image display device having a control device, screen management means for managing the display data stored in the video memory by dividing it into a plurality of regions, and storing it in any of the divided regions of the video memory Display area determination means for recognizing that a selection operation for enlarging and displaying the displayed display data has been performed, and for recognizing the specified display area, and display read from the selected area of the video memory Image enlargement processing means for enlarging data to a predetermined display resolution is provided.
[0015]
According to the present invention, in the display control device, when the image enlargement processing means enlarges the display data by n times in the horizontal direction (n is an integer of 1 or more), one point of display data is displayed in the horizontal direction by n points. The process to enlarge to a predetermined display resolution is performed.
According to the present invention, in the display control device, when the image enlargement processing means enlarges the display data in the vertical direction by m times (m is an integer of 1 or more), one line of display data is displayed for each m lines. Processing is performed to enlarge to a predetermined display resolution.
Furthermore, according to the present invention, in the display control apparatus, when the image enlargement processing means enlarges the display data n times in the horizontal direction and m times in the vertical direction, one point of display data is displayed in the horizontal direction by n points. In addition, a process of displaying one line of display data in units of m lines is performed to perform a process of enlarging the display data to a predetermined display resolution.
[0016]
According to the present invention, in the display control device, the display area determination means recognizes the selection operation and the display area by selecting an area of the display data stored in the video memory displayed on the display screen.
[0017]
Furthermore, according to the present invention, in the above display control device, the display area determination means recognizes the selection operation and the display area by depressing a specific key of the keyboard device.
[0018]
The present invention relates to a video memory for storing display data, and a display for controlling the display data to be transferred to and stored in the video memory in accordance with a display command and to display the display data stored in the video memory for display on the display device. In the image display device having the control device and the display means, the display control device is divided into a plurality of areas and managed by dividing the display data stored in the video memory into a plurality of areas and the video memory. A display area determining means for recognizing that a selection operation for enlarging and displaying the display data stored in any of the areas has been performed, and for recognizing the designated display area; and the selected area of the video memory And image enlargement processing means for enlarging the display data read from the image data to a predetermined display resolution.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of a display control device of an image display device according to the present invention will be described with reference to FIGS.
FIG. 1 is a block diagram illustrating the configuration of a display control apparatus having a designated area display function according to the present invention, and FIG. 2 is a configuration of a screen management table for storing screen areas managed by the screen management means of the display control apparatus. FIG. 3 is a schematic diagram for explaining a display state before the operation of the display control apparatus having the designated area display function of FIG. 1, and FIG. 4 shows the operation of the area display control in the display control apparatus. FIG. 5 is a schematic diagram for explaining the display principle of the display control apparatus having the designated area display function shown in FIG.
[0020]
The configuration of the display control apparatus having the designated area display function according to this embodiment will be described below.
The display control device according to this embodiment is a device having a function of enlarging and displaying display data in a specified area. From a video memory storing display data for X dots × Y lines, (1 / N) is a device that reads display data of a size from a specified area, multiplies it by n, and displays it on the screen of a display means having a resolution of X dots × Y lines. Here, n is an integer of 1 or more.
[0021]
As shown in FIG. 1, the image display device 1 according to this embodiment includes a CPU 10, a video memory 20, a display control device 30, a DAC 40 with a color palette, and a display means 50 including a CRT. Configured.
[0022]
The display control device 30 is designated by display data writing means 31 for writing display data for X dots × Y lines to a predetermined address of the video memory 20 and display data having a size of 1 / n from the video memory 20. Display data reading means 32 for reading from the area, display area determination means 33 for determining an area to be displayed based on the area display command when there is an area display command for displaying the specified area, An image enlarging means 34 for enlarging display data of a predetermined area read from the video memory by n times, and a screen management section 35 for storing and managing display data for X dots × Y lines divided into a plurality of areas in the video memory 20. And have.
[0023]
Here, the CPU 10, the video memory 20, the DAC 40 with color palette, and the display means 50 have substantially the same structure and function as the conventional display device shown in FIG.
[0024]
The CPU 10 controls the operation of the entire image display apparatus 1 and has substantially the same configuration and function as the CPU of the conventional image display apparatus. The CPU 10 creates display data based on an external command.
[0025]
The video memory 20 is a readable / writable video memory that stores display data created by the CPU 10 as image data to be displayed on the display means 50, and a DRAM (Dynamic RAM) or a dual port RAM can be used.
[0026]
The display control device 30 has a function of writing display data created by the CPU 10 to the video memory 20 and a function of reading display data from the video memory 20 and sending it to the DAC 40. Further, the display control device 30 monitors the input of the area display command for selecting the area display, and determines the display area designated by the display area judging means 33 when the area designation command is inputted, and the screen management unit A function of reading display data of a predetermined area from the video memory 20 based on the screen management information 35, generating display data by enlarging to a specified magnification by the image enlargement processing unit 34, and transmitting the display data to the DAC 40 with a color palette have.
[0027]
The color palette-added DAC 40 converts the digital display data sent from the display control device 30 into analog display data, and sends it to the display means 50 on a predetermined frequency. The DAC 40 with a color palette has a color information table called a color palette, and has a function of determining colors to be displayed by comparing the color data stored in the video memory with the color information table.
When a liquid crystal display is used as the display means 50, a digital display signal can be sent directly, so the DAC 40 is not required.
[0028]
The display unit 50 is configured using a CRT or the like, and displays a screen using image data sent from the display control device 30 via the DAC 40.
[0029]
The display data writing means 31 of the display control device 30 has a function of writing display data created by the CPU 10 to a predetermined address of the video memory 20.
[0030]
The display data reading means 32 has a function of reading display data of a designated size from a designated area based on the screen management information from the screen management section 35 and sending it out to the image enlargement processing means 34.
[0031]
The display area determination unit 33 monitors the input of an area display command, and transmits an activation signal for displaying an area to the screen management unit 35 when an instruction to select and display an area is received.
[0032]
The image enlargement processing unit 34 has a function of multiplying display data of a specified size read by the display data reading unit 32 by n × m and expanding it to display data having a resolution of X dots × Y lines.
[0033]
The screen management unit 35 sets and stores screen area management information in response to an activation signal from the display area determination unit 33.
[0034]
The screen management unit 33 manages display data for X dots × Y lines stored in the video memory 20 by dividing it into n × m areas.
The screen management unit 35 has, for example, a screen management table 350 shown in FIG. 2 in which the display screen mode is set. The screen management table 350 includes an index field 351 corresponding to the mode displayed on the screen of the display means, a selection flag setting field 352, a divided area field 353 for storing an area to be displayed on the screen, and a division in the X direction. An X division field 354 for storing the number n, a Y division field 355 for storing the division number m in the Y direction, and a display start point storage field 356 are provided.
[0035]
In this example, the screen is set to be divided into two in accordance with the index in the index field 351. A mode "0" in which all display data is displayed on the entire screen, and the display data is divided into two on the left and right. Modes “1” and “2” are set in which one display data is expanded in the horizontal direction and displayed on the entire screen.
[0036]
In the selection flag setting field 352, a selection flag “1” is set at a location corresponding to the corresponding index when an area display selection command is issued.
[0037]
The divided area column 353 shows the divided areas, the index “0” indicates the “X, Y” area indicating the entire screen, and the index “1” indicates the left of the left and right divided areas. An “X1, Y” area indicating a screen is shown, and an index “2” indicates an “X2, Y” area indicating a right screen after being divided into left and right parts.
[0038]
The X division field 354 stores the number of divisions n in the X direction, and is “1” when not dividing left and right, “2” when dividing left and right, and “n” when dividing n left and right. Stored.
[0039]
The Y division field 355 stores the number of divisions m in the Y direction, “1” when not dividing up and down, “2” when dividing up and down, and “m” when dividing up and down m. "Is stored. In this embodiment, “1” is stored because it is not divided vertically.
[0040]
The display start point storage field 356 stores the coordinates of the display start point on the video memory 20 corresponding to the display mode.
[0041]
Next, the operation of the image display device 1 will be described.
FIG. 3 shows a display state of the screen of the display means 50 before the display control apparatus having the designated area display function of FIG. 1 operates.
An X × Y screen is displayed on the display screen 51 of the display means 50. Consider dividing this screen into two regions, a screen region 1 and a screen region 2.
When any one of the screen areas is selected and enlargedly displayed on the screen 51, a display area selection window 52 indicating the display area is displayed on the screen 51.
[0042]
As shown in the flowchart of FIG. 4, in the area display process, the display area determination means 33 inputs a designated display area selection in which the display area selection window 52 on the display screen 51 shown in FIG. 3 is specified using a pointing device. The presence or absence of the display area is monitored, and when there is an area display command, the designated display area is determined (step 10).
When there is no input for selecting the designated display area, monitoring and determination of the input for selecting the designated display area are continued, and when there is an input, area selection information indicating which display area is selected by the screen management unit 35 Send.
[0043]
The screen management unit 35 acquires a selection flag corresponding to the screen region of the screen management table 350 in the screen management unit 35 from the transmitted region selection information, and determines and sets the acquired selection flag (S11). .
If the acquired selection flag is “0”, it is set to “1”. If the acquired selection flag is “1”, it is set to “0”, and a display start signal is transmitted to the display data reading means 32.
Based on the display start signal transmitted from the screen management unit 35, the display data reading means 32 acquires the display area information of the screen management table 350 in the screen management unit 35 shown in FIG. 2 (S12), and based on the acquired information. Then, the display start coordinates (a, b) of the screen area are calculated with reference to the display start point column 356 of the index number 351 for which the selection flag is set (S13). When the selection flag is not set, the display start coordinates of the index number “0” screen area are calculated.
[0044]
Taking the setting of the display area information using the screen management table 350 shown in FIG. 2 as an example, since the selection flag is set for the index number “1”, the display area is changed from the display start point column 356 of the index number “1”. Display start coordinates (a, b) are calculated, and whether or not the Y-axis display start coordinates b is equal to or smaller than the number of lines Y is determined in the vertical drawing process (S14).
If the display start coordinate b is larger than the screen area Y of the index number “1”, the process returns to step S10, and if it is smaller, the process proceeds to step S15.
[0045]
Next, it is determined whether or not the display start coordinate “a” on the X axis is equal to or less than the number of dots X1 in the divided area for the horizontal display process (S15).
If the display start coordinate a is larger than the screen area X1 with the index number “1”, “1” is added to the display start coordinate b (S16), and the process returns to step S14 to display the next line.
When the display start coordinate a is smaller than the screen area X1 with the index number “1”, the display start address A on the video memory 20 is calculated from the display start coordinate (a, b) (S17).
[0046]
Data of the display start address A calculated in step S17 is acquired from the video memory 20 (S18).
Next, the number n of X direction division numbers (in this example, “2”) is read from the X division column of the screen management table 350 (S19).
Display data of the display start address A is displayed on the display screen 51 (S20).
The same display data as displayed in step S20 is displayed on the display screen 51 in order in the X direction by the number of X direction divisions n (n = 2) (S21).
Next, "1" is added to the display start coordinate a (S22), and the process returns to step S15, and the display data is sequentially read out from the new display start address A and enlarged on the display screen.
[0047]
When the display data for one line is displayed, since the display start address a exceeds X1 (X1 <a) in step S15, the process proceeds to step S16, and similarly the display data for the next line is read and displayed on the display screen 51. The image is enlarged and displayed (S15-22).
By repeating this process until the display start address b exceeds Y (Y <a) and displays all the lines, the display data of the screen area 1 can be displayed in a horizontal double angle on the screen. .
[0048]
With the above processing, the display data for each dot shown in FIG. 5A can be displayed in double horizontal angle so that two dots per line are displayed as shown in FIG. 5B, and only the region to be displayed is selected. The designated area is enlarged and displayed so that the characters can be easily seen and work efficiency can be improved.
[0049]
The configuration of the display control apparatus having the designated area display function according to the second embodiment will be described below with reference to FIGS.
FIG. 6 is a block diagram for explaining the configuration of a display control apparatus having a designated area display function according to the second embodiment of the present invention, and FIG. 7 is a screen area managed by the screen management means of the display control apparatus. FIG. 8 is a schematic diagram for explaining the display principle of the display control apparatus having the designated area display function of FIG. 6, and FIG. 9 is an area in the display control apparatus. FIG. 10 is a schematic diagram for explaining a display state before the operation of the display control apparatus having the designated area display function of FIG. 6.
[0050]
The display control device according to this embodiment is a device having a function of enlarging and displaying display data in a specified area. From a video memory storing display data for X dots × Y lines, (1 / N) × (1 / m) display data is read from a specified area, multiplied by n × m, and displayed on the screen of a display unit having a resolution of X dots × Y lines. Here, n and m are integers of 1 or more, respectively.
[0051]
As shown in FIG. 6, the image display device 1 according to the second embodiment includes a CPU 10, a video memory 20, a display control device 30, a DAC 40 with a color palette, a display unit 50 including a CRT, And a keyboard device 60.
[0052]
The display control device 30 includes display data writing means 31 for writing display data for X dots × Y lines to a predetermined address of the video memory 20, and (1 / n) × (1 / m) from the video memory 20. Display data reading means 32 for reading display data of a size from a designated area, image enlargement means 34 for enlarging display data of a predetermined area read from the video memory by n × m times, and video memory 20 There are a screen management unit 35 that stores and manages display data for X dots × Y lines divided into a plurality of areas in the video memory 20 and an area display instruction that is an instruction to display an area input from the keyboard device. In some cases, a keyboard input information management unit 36 that determines an area to be displayed based on the area display command is provided.
[0053]
Here, the CPU 10, the video memory 20, the DAC 40 with color palette, and the display means 50 have substantially the same structure and function as those of the image display apparatus according to the first embodiment shown in FIG.
[0054]
The CPU 10 controls the operation of the entire image display apparatus 1 and has substantially the same configuration and function as the CPU of the conventional image display apparatus. The CPU 10 creates drawing data based on an external command.
[0055]
The video memory 20 is a readable / writable video memory that stores drawing data created by the CPU 10 as image data to be displayed on the display means 50, and a DRAM (Dynamic RAM) or a dual port RAM can be used.
[0056]
The display control device 30 has a function of writing drawing data created by the CPU 10 into the video memory 20 and a function of reading display data from the video memory 20 and sending it to the DAC 40. Further, the display control device 30 monitors the input of the area display command for selecting the area display, and determines the display area designated by the display area judging means 36 when the area designation command is inputted, and the screen management unit A function of reading display data of a predetermined area from the video memory 20 based on the screen management information 35, generating display data by enlarging to a specified magnification by the image enlargement processing unit 34, and transmitting the display data to the DAC 40 with a color palette have.
[0057]
The color palette-added DAC 40 converts the digital display data sent from the display control device 30 into analog display data, and sends it to the display means 50 on a predetermined frequency. The DAC 40 with a color palette has a color information table called a color palette, and has a function of determining colors to be displayed by comparing the color data stored in the video memory with the color information table.
When a liquid crystal display is used as the display means 50, a digital display signal can be sent directly, so the DAC 40 is not required.
[0058]
The display unit 50 is configured using a CRT or the like, and displays a screen using image data sent from the display control device 30 via the DAC 40.
[0059]
The keyboard device 60 inputs characters and numbers.
[0060]
The display data writing means 31 of the display control device 30 has a function of writing the drawing data created by the CPU 10 to a predetermined address in the video memory 20.
[0061]
The display data reading unit 32 has a function of reading display data having a specified size from a specified region based on the screen management information from the screen management unit 35 and sending it to the image enlargement processing unit 34.
[0062]
The image enlargement processing unit 34 has a function of multiplying display data of a specified size read by the display data reading unit 32 by n × m and expanding it to display data having a resolution of X dots × Y lines.
[0063]
The screen management unit 35 sets and stores the management information of the screen area in response to the activation signal from the keyboard input information management unit 36, and transmits a display start signal to the display control device 30.
The screen management unit 35 acquires and acquires the specific key assigned to the screen management table 350 information and the selection flag corresponding to the transmitted specific key information in the screen management unit 35 shown in FIG. The selected flag is determined and set (S31). If the selection flag is “0”, it is set to “1”. If the selection flag is “1”, it is set to “0”, and a display start signal is transmitted to the display control device 30.
Based on the display start signal transmitted from the screen management unit 35, the display control apparatus 30 acquires screen management table information in the screen management unit 35 shown in FIG. 9, and the selection flag is set in step S33 based on the acquired information. The drawing start coordinates (a, b) of the screen area of the set index number are calculated (S32). When the selection flag is not set, the drawing start coordinates of the index number “0” screen area are calculated.
[0064]
The screen management unit 35 has, for example, a screen management table 350 shown in FIG. 7 in which the display screen mode is set. The screen management table 350 includes an index field 351 corresponding to the mode displayed on the screen of the display means, a selection flag setting field 352, a divided area field 353 for storing an area to be displayed on the screen, and a division in the X direction. It has an X division field 354 for storing the number n, a Y division field 355 for storing the division number m in the Y direction, a display start point storage field 356, and a specific key field 357.
[0065]
In this example, the screen is set to be divided into four as shown in FIG. 8 corresponding to the index in the index field 351, the mode “0” for displaying all display data on the entire screen, the display of the screen area 11 A mode “1” in which data is expanded in the horizontal and vertical directions and displayed on the entire screen, a mode “2” in which display data in the screen area 21 is expanded in the horizontal and vertical directions and displayed on the entire screen, and a screen region 12 "3" is set to expand the display data in the horizontal and vertical directions and display it on the entire screen, and "4" to display the display data in the screen area 22 in the horizontal and vertical directions and display it on the entire screen. Has been.
[0066]
In the selection flag setting field 352, a selection flag “1” is set at a location corresponding to the corresponding index when an area display selection command is issued.
[0067]
The divided area column 353 shows the divided areas. The index “0” includes the “X, Y” area indicating the entire screen, and the index “1” includes the screen area 11 “X1, Y1”. The index “2” indicates the screen area 21 “X2, Y1”, the index “3” indicates the screen area 12 “X1, Y2”, and the index “4” indicates the screen area 22 “X2, Y2”. Has been.
[0068]
The X division field 354 stores the number of divisions n in the X direction, and stores “1” when not dividing left and right, and “2” when dividing horizontally.
[0069]
The Y division field 355 stores the division number m in the Y direction, and stores “1” when not dividing vertically, and “2” when dividing vertically.
[0070]
The display start point storage field 356 stores the coordinates of the display start point on the video memory 20 corresponding to the display mode.
[0071]
A specific key manually set corresponding to the index is registered in the specific key column 357.
[0072]
The keyboard input information management unit 36 monitors input information from the keyboard device 60, and transmits a specified region display activation signal to the screen management unit 35 when a certain key is input (for example, Ctrl + alt). have.
[0073]
The display control device 30 generates display data based on the management information of the screen management unit 35 and the information of the video memory based on the signal transmitted from the screen management unit 35 and transmits it to the DAC 40 with a color palette.
[0074]
FIG. 8 shows the display state of the screen of the display means 50 before the display control apparatus having the designated area display function of FIG. 6 operates.
An X × Y screen is displayed on the display screen 51 of the display means 50. Consider dividing this screen into four areas, a screen area 11 to a screen area 22.
When any one of the screen areas is selected and enlargedly displayed on the screen 51, the display area is designated by depressing the specifying device of the keyboard means 60.
[0075]
As shown in FIG. 9, in the area display processing of this embodiment, the keyboard input information management unit 36 monitors the output information output from the keyboard device 60 and determines whether or not there is an input of a specific key. Is performed (step S30). If no specific key is input, monitoring and determination of input are continued. When a specific key is input, specific key information indicating which area is selected is transmitted to the screen management unit 35.
[0076]
The screen management unit 35 refers to the screen management table based on the input specific key information, sets a screen area (S31), and acquires screen information indicating the divided area (S32). The screen management unit 35 calculates display start coordinates (a, b) based on the acquired screen information (S33).
[0077]
Taking the setting of the display area information in FIG. 7 as an example, since the selection flag is set for the index number “1”, the drawing start coordinates (a, b) of the screen area with the index number “1” are calculated, The direction drawing process is determined (S34).
If the drawing start coordinate b is larger than the screen area Y1 with the index number “1”, the process returns to step S30. If the drawing start coordinate b is smaller, the process of steps S36 to S43 is performed by the number of Y-direction divisions (in this example, two divisions). Repeat (S35).
[0078]
It is determined whether or not the drawing start coordinate “a” is larger than the screen area X1 with the index number “1”, and the horizontal drawing process is determined (S36).
If the drawing start coordinate a is larger than the screen area X1 with the index number “1”, the drawing start coordinate a is initialized (S37).
If it is determined in step S35 that the drawing start coordinate a has not reached the screen area X1 with the index number “1”, the display start address A11 is calculated using the display start coordinates (a, b) (S38).
The video memory 20 is accessed to obtain the calculated display start address A11 data (S39).
The acquired data is displayed on the display screen 51 of the display means 50 by the number of dots in the number of X direction divisions (2 divisions in the example of FIG. 2) (S40, 41, 42).
[0079]
Next, "1" is added to the display start coordinate a (S43), the process returns to step S36, the next display data in the horizontal direction is read, and the display screen 51 of the display means 50 for the number of dots corresponding to the number of divisions in the X direction. (S36 to S43). After repeating this process for one line, reading and display of display data from the display start address A11 are repeated by the number of divisions in the vertical direction (S44).
[0080]
When the display of one line is repeated as many times as the number of divisions in the Y direction by the above process, “1” is added to the display start coordinate b (S45), and the process returns to step S34 to display the display data of the next line from the video memory 20. Is read and displayed.
[0081]
Through the above processing, 1 line 1 dot data as shown in FIG. 10A can be displayed as 2 lines 2 dots as shown in FIG. 10B, and the specific key assigned to the area to be displayed is displayed. By simply pressing it, the specified area is enlarged and displayed in double and vertical angles, making it easier to see the characters and improving work efficiency.
[0082]
The normal display screen in which the selection flag in FIG. 8 is not set is processed by steps S30 to S45 in FIG. 9 based on the setting of the display area information shown in FIG. 51 can be displayed.
[0083]
A third embodiment of the present invention will be described with reference to FIG. 9 is changed to the process of step S10 shown in FIG. 4 in the area display process shown in FIG. 9, and the screen area is set to n × m and is managed by the screen management unit 35 shown in FIG. By changing the area so that n screens are managed in the X direction and m screens are managed in the Y direction as shown in FIG. 11, the configuration of the designated area display device shown in FIG. The form which can respond | correspond also to * n screen is shown.
The area display process in this case is the same as the process in step S35 shown in FIG. 9 after step S14 in FIG. 4, and the same process as in steps S44 and S45 in FIG. 9 is added after step S22. The vertical overlapping display is performed and is performed in substantially the same manner as the display processing of FIG.
[0084]
A fourth embodiment of the present invention will be described with reference to FIG. The screen management table 350 shown in FIG. 13 shows a form in which the screen area of the n screen in the X direction and the m screen in the Y direction shown in FIG. 12 is managed using the image display device 1 shown in FIG. ing. In this embodiment, by executing the area display processing shown in FIG. 9 using the screen management table 350 shown in FIG. 12, the screen area designated from the m × n screen shown in FIG. The display can be enlarged to m × n.
[0085]
【The invention's effect】
As described above, according to the present invention, even when the display screen has a high resolution or a small character displayed on the screen of an information portable terminal or the like, the specific key assigned to the area to be displayed or selected is selected. By simply pressing, the designated area can be enlarged and displayed, and even if the application or the like is not equipped with an enlargement function, the characters can be easily displayed and the work efficiency can be improved.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a configuration of an image display apparatus having a designated area display function according to the present invention.
2 is a view showing the contents of a screen management table provided in the screen management unit of the image display apparatus shown in FIG. 1;
3 is a view for explaining a screen area of the image display device shown in FIG. 1; FIG.
4 is a flowchart showing an operation of area display processing of the image display apparatus shown in FIG. 1;
5 is a schematic diagram illustrating a display mode of the image display device illustrated in FIG. 1. FIG.
FIG. 6 is a block diagram showing a configuration of an image display device having a designated area display function according to a second embodiment of the present invention.
7 is a view showing the contents of a screen management table provided in the screen management unit of the image display apparatus shown in FIG. 6;
8 is a view for explaining a screen area of the image display device shown in FIG. 6;
FIG. 9 is a flowchart showing the region display processing operation of the image display apparatus shown in FIG. 6;
10 is a schematic diagram illustrating a display mode of the image display device illustrated in FIG.
FIG. 11 is a view showing the contents of a screen management table provided in a screen management unit of an image display apparatus having a designated area display function according to a third embodiment of the present invention.
FIG. 12 is a schematic diagram for explaining a display mode of the image display devices according to the third and fourth embodiments of the present invention.
FIG. 13 is a view showing the contents of a screen management table provided in a screen management unit of an image display apparatus having a designated area display function according to a third embodiment of the present invention.
FIG. 14 is a block diagram showing a configuration of a conventional image display apparatus.
FIG. 15 is a flowchart showing the operation of a conventional image display apparatus.
[Explanation of symbols]
10 CPU
20 Video memory
30 Display control device
31 Display data writing means
32 Display data reading means
33 Display area determination means
34 Image enlargement means
35 Screen Manager
350 Screen management table
36 Keyboard Input Information Management Department
40 DAC with color palette
50 Display means
51 Display screen
60 keyboard device

Claims (5)

Connected to a video memory that stores display data,
In a display control apparatus that performs control for reading display data stored in the video memory and displaying the display data on a display means,
Screen management means for dividing and managing display data stored in the video memory into a plurality of areas;
A selection input means for selecting any one of the divided areas of the display data stored in the video memory as a display area;
A display area determining means for recognizing an input for selecting an area from the selection input means and for recognizing the selected display area of the video memory;
Image enlargement processing means for enlarging display data read from a selected area of the video memory to a predetermined display resolution;
An index field corresponding to a mode displayed on the screen of the display means, a selection flag setting field, and an area to be displayed on the screen are stored as a horizontal dot number and a vertical line number. A screen management table consisting of a field and a display start point storage field,
The display start point corresponding to the selection flag of the screen management table is compared with the data in the divided region column and the data in the display start point storage column by the display region selection input by the pointing device in the display region selection window displayed on the display means. The display control apparatus is characterized by reading display data to be displayed from the video memory.   When the image enlargement processing means enlarges the display data n times in the horizontal direction (n is an integer equal to or greater than 1), the display enlargement processing unit performs a process of displaying one point of display data n times in the horizontal direction to obtain a predetermined display resolution. The display control apparatus according to claim 1, wherein the display control apparatus is enlarged.   When the image enlargement processing means enlarges the display data in the vertical direction by m times (m is an integer of 1 or more), the display enlargement processing unit performs a process of displaying the display data of one line at a time by m lines and enlarges it to a predetermined display resolution. The display control apparatus according to claim 1.   When the image enlargement processing means enlarges the display data n times in the horizontal direction and m times in the vertical direction, one point of display data is displayed n times in the horizontal direction, and one line of display data is displayed in m lines. The display control apparatus according to claim 1, wherein the display control apparatus enlarges the display resolution to a predetermined display resolution. 5. An image display device comprising: the display control device according to claim 1; and display means connected to the display control device for displaying display data.

Images